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- Committer: Björn Påhlsson
- Date: 2010-09-02 18:53:38 UTC
- mto: (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@fukt.bsnet.se-20100902185338-d1022sv517txn3sb
early commit to ease todays coding
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
26
asprintf(), O_CLOEXEC */
28
27
#include <stddef.h> /* size_t, NULL */
29
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
29
realloc() */
31
30
#include <stdbool.h> /* bool, true, false */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
57
58
#include <errno.h> /* errno */
58
59
#include <argp.h> /* struct argp_option, struct
59
60
argp_state, struct argp,
69
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
73
76
74
#define BUFFER_SIZE 256
77
75
78
76
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
78
82
79
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
81
85
82
typedef struct plugin{
86
83
char *name; /* can be NULL or any plugin name */
106
103
107
104
/* Gets an existing plugin based on name,
108
105
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
106
static plugin *getplugin(char *name){
111
107
/* Check for existing plugin with that name */
112
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
173
169
}
174
170
175
171
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
172
static bool add_to_char_array(const char *new, char ***array,
178
173
int *len){
179
174
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
175
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
185
179
/* Malloc check */
186
if(new_array == NULL){
180
if(*array == NULL){
187
181
return false;
188
182
}
189
*array = new_array;
190
183
/* Make a copy of the new string */
191
184
char *copy;
192
185
do {
204
197
}
205
198
206
199
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
200
static bool add_argument(plugin *p, const char *arg){
209
201
if(p == NULL){
210
202
return false;
213
205
}
214
206
215
207
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
208
static bool add_environment(plugin *p, const char *def, bool replace){
218
209
if(p == NULL){
219
210
return false;
221
212
/* namelen = length of name of environment variable */
222
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
214
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
226
217
/* It already exists */
227
218
if(replace){
228
char *new_envdef;
219
char *new;
229
220
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
233
224
return false;
234
225
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
226
*e = new;
227
strcpy(*e, def);
237
228
}
238
229
return true;
239
230
}
241
232
return add_to_char_array(def, &(p->environ), &(p->envc));
242
233
}
243
234
244
#ifndef O_CLOEXEC
245
235
/*
246
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
237
* Descriptor Flags".
248
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
249
239
*/
250
__attribute__((warn_unused_result))
251
240
static int set_cloexec_flag(int fd){
252
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
253
242
/* If reading the flags failed, return error indication now. */
258
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
248
ret | FD_CLOEXEC));
260
249
}
261
#endif /* not O_CLOEXEC */
262
250
263
251
264
252
/* Mark processes as completed when they exit, and save their exit
278
266
/* No child processes */
279
267
break;
280
268
}
281
error(0, errno, "waitpid");
269
perror("waitpid");
282
270
}
283
271
284
272
/* A child exited, find it in process_list */
296
284
}
297
285
298
286
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
287
static bool print_out_password(const char *buffer, size_t length){
301
288
ssize_t ret;
302
289
for(size_t written = 0; written < length; written += (size_t)ret){
310
297
}
311
298
312
299
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
300
static void free_plugin(plugin *plugin_node){
315
301
316
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
348
334
349
335
int main(int argc, char *argv[]){
350
336
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
337
char *argfile = NULL;
353
338
FILE *conffp;
354
struct dirent **direntries = NULL;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
355
342
struct stat st;
356
343
fd_set rfds_all;
357
344
int ret, maxfd = 0;
365
352
.sa_flags = SA_NOCLDSTOP };
366
353
char **custom_argv = NULL;
367
354
int custom_argc = 0;
368
int dir_fd = -1;
369
355
370
356
/* Establish a signal handler */
371
357
sigemptyset(&sigchld_action.sa_mask);
372
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
359
if(ret == -1){
374
error(0, errno, "sigaddset");
360
perror("sigaddset");
375
361
exitstatus = EX_OSERR;
376
362
goto fallback;
377
363
}
378
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
365
if(ret == -1){
380
error(0, errno, "sigaction");
366
perror("sigaction");
381
367
exitstatus = EX_OSERR;
382
368
goto fallback;
383
369
}
416
402
.doc = "Group ID the plugins will run as", .group = 3 },
417
403
{ .name = "debug", .key = 132,
418
404
.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 },
423
405
/*
424
406
* These reproduce what we would get without ARGP_NO_HELP
425
407
*/
432
414
{ .name = NULL }
433
415
};
434
416
435
__attribute__((nonnull(3)))
436
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
418
errno = 0;
438
419
switch(key){
439
420
char *tmp;
440
intmax_t tmp_id;
421
intmax_t tmpmax;
441
422
case 'g': /* --global-options */
442
423
{
443
424
char *plugin_option;
446
427
break;
447
428
}
448
429
}
449
errno = 0;
450
430
}
451
431
break;
452
432
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
455
}
433
add_environment(getplugin(NULL), arg, true);
456
434
break;
457
435
case 'o': /* --options-for */
458
436
{
475
453
break;
476
454
}
477
455
}
478
errno = 0;
479
456
}
480
457
break;
481
458
case 'E': /* --env-for */
493
470
errno = EINVAL;
494
471
break;
495
472
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
473
add_environment(getplugin(arg), envdef, true);
499
474
}
500
475
break;
501
476
case 'd': /* --disable */
503
478
plugin *p = getplugin(arg);
504
479
if(p != NULL){
505
480
p->disabled = true;
506
errno = 0;
507
481
}
508
482
}
509
483
break;
512
486
plugin *p = getplugin(arg);
513
487
if(p != NULL){
514
488
p->disabled = false;
515
errno = 0;
516
489
}
517
490
}
518
491
break;
519
492
case 128: /* --plugin-dir */
520
493
free(plugindir);
521
494
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
525
495
break;
526
496
case 129: /* --config-file */
527
497
/* This is already done by parse_opt_config_file() */
528
498
break;
529
499
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
531
501
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
502
or tmpmax != (uid_t)tmpmax){
533
503
argp_error(state, "Bad user ID number: \"%s\", using %"
534
504
PRIdMAX, arg, (intmax_t)uid);
535
505
break;
536
506
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
507
uid = (uid_t)tmpmax;
539
508
break;
540
509
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
542
511
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
512
or tmpmax != (gid_t)tmpmax){
544
513
argp_error(state, "Bad group ID number: \"%s\", using %"
545
514
PRIdMAX, arg, (intmax_t)gid);
546
515
break;
547
516
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
517
gid = (gid_t)tmpmax;
550
518
break;
551
519
case 132: /* --debug */
552
520
debug = true;
553
521
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
522
/*
562
523
* These reproduce what we would get without ARGP_NO_HELP
563
524
*/
564
525
case '?': /* --help */
565
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
__builtin_unreachable();
568
528
case -3: /* --usage */
569
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
570
530
argp_state_help(state, state->out_stream,
571
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
__builtin_unreachable();
573
532
case 'V': /* --version */
574
533
fprintf(state->out_stream, "%s\n", argp_program_version);
575
534
exit(EXIT_SUCCESS);
585
544
if(arg[0] == '\0'){
586
545
break;
587
546
}
588
/* FALLTHROUGH */
589
547
default:
590
548
return ARGP_ERR_UNKNOWN;
591
549
}
610
568
case 129: /* --config-file */
611
569
free(argfile);
612
570
argfile = strdup(arg);
613
if(argfile != NULL){
614
errno = 0;
615
}
616
571
break;
617
572
case 130: /* --userid */
618
573
case 131: /* --groupid */
619
574
case 132: /* --debug */
620
case 133: /* --plugin-helper-dir */
621
575
case '?': /* --help */
622
576
case -3: /* --usage */
623
577
case 'V': /* --version */
645
599
case ENOMEM:
646
600
default:
647
601
errno = ret;
648
error(0, errno, "argp_parse");
602
perror("argp_parse");
649
603
exitstatus = EX_OSERR;
650
604
goto fallback;
651
605
case EINVAL:
672
626
custom_argc = 1;
673
627
custom_argv = malloc(sizeof(char*) * 2);
674
628
if(custom_argv == NULL){
675
error(0, errno, "malloc");
629
perror("malloc");
676
630
exitstatus = EX_OSERR;
677
631
goto fallback;
678
632
}
695
649
}
696
650
new_arg = strdup(p);
697
651
if(new_arg == NULL){
698
error(0, errno, "strdup");
652
perror("strdup");
699
653
exitstatus = EX_OSERR;
700
654
free(org_line);
701
655
goto fallback;
702
656
}
703
657
704
658
custom_argc += 1;
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
}
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;
717
666
}
718
667
custom_argv[custom_argc-1] = new_arg;
719
668
custom_argv[custom_argc] = NULL;
723
672
ret = fclose(conffp);
724
673
} while(ret == EOF and errno == EINTR);
725
674
if(ret == EOF){
726
error(0, errno, "fclose");
675
perror("fclose");
727
676
exitstatus = EX_IOERR;
728
677
goto fallback;
729
678
}
732
681
/* Check for harmful errors and go to fallback. Other errors might
733
682
not affect opening plugins */
734
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
735
error(0, errno, "fopen");
684
perror("fopen");
736
685
exitstatus = EX_OSERR;
737
686
goto fallback;
738
687
}
749
698
case ENOMEM:
750
699
default:
751
700
errno = ret;
752
error(0, errno, "argp_parse");
701
perror("argp_parse");
753
702
exitstatus = EX_OSERR;
754
703
goto fallback;
755
704
case EINVAL:
769
718
case ENOMEM:
770
719
default:
771
720
errno = ret;
772
error(0, errno, "argp_parse");
721
perror("argp_parse");
773
722
exitstatus = EX_OSERR;
774
723
goto fallback;
775
724
case EINVAL:
777
726
goto fallback;
778
727
}
779
728
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
798
729
if(debug){
799
for(plugin *p = plugin_list; p != NULL; p = p->next){
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
800
731
fprintf(stderr, "Plugin: %s has %d arguments\n",
801
732
p->name ? p->name : "Global", p->argc - 1);
802
733
for(char **a = p->argv; *a != NULL; a++){
809
740
}
810
741
}
811
742
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);
743
/* Strip permissions down to nobody */
744
setgid(gid);
838
745
if(ret == -1){
839
error(0, errno, "setgid");
746
perror("setgid");
840
747
}
841
748
ret = setuid(uid);
842
749
if(ret == -1){
843
error(0, errno, "setuid");
750
perror("setuid");
844
751
}
845
752
846
753
/* Open plugin directory with close_on_exec flag */
847
754
{
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
);
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
}
855
773
if(dir_fd == -1){
856
error(0, errno, "Could not open plugin dir");
774
perror("Could not open plugin dir");
857
775
exitstatus = EX_UNAVAILABLE;
858
776
goto fallback;
859
777
}
862
780
/* Set the FD_CLOEXEC flag on the directory */
863
781
ret = set_cloexec_flag(dir_fd);
864
782
if(ret < 0){
865
error(0, errno, "set_cloexec_flag");
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
866
785
exitstatus = EX_OSERR;
867
786
goto fallback;
868
787
}
869
788
#endif /* O_CLOEXEC */
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
}
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;
893
796
}
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;
904
797
}
905
798
906
799
FD_ZERO(&rfds_all);
907
800
908
801
/* Read and execute any executable in the plugin directory*/
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]);
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");
915
874
continue;
916
875
}
917
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
918
878
if(ret == -1){
919
error(0, errno, "stat");
920
close(plugin_fd);
921
free(direntries[i]);
879
perror("stat");
880
free(filename);
922
881
continue;
923
882
}
924
883
925
884
/* Ignore non-executable files */
926
885
if(not S_ISREG(st.st_mode)
927
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
928
X_OK, 0)) != 0)){
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
929
887
if(debug){
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);
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
934
890
}
935
close(plugin_fd);
936
free(direntries[i]);
891
free(filename);
937
892
continue;
938
893
}
939
894
940
plugin *p = getplugin(direntries[i]->d_name);
895
plugin *p = getplugin(dirst->d_name);
941
896
if(p == NULL){
942
error(0, errno, "getplugin");
943
close(plugin_fd);
944
free(direntries[i]);
897
perror("getplugin");
898
free(filename);
945
899
continue;
946
900
}
947
901
if(p->disabled){
948
902
if(debug){
949
903
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
950
direntries[i]->d_name);
904
dirst->d_name);
951
905
}
952
close(plugin_fd);
953
free(direntries[i]);
906
free(filename);
954
907
continue;
955
908
}
956
909
{
959
912
if(g != NULL){
960
913
for(char **a = g->argv + 1; *a != NULL; a++){
961
914
if(not add_argument(p, *a)){
962
error(0, errno, "add_argument");
915
perror("add_argument");
963
916
}
964
917
}
965
918
/* Add global environment variables */
966
919
for(char **e = g->environ; *e != NULL; e++){
967
920
if(not add_environment(p, *e, false)){
968
error(0, errno, "add_environment");
921
perror("add_environment");
969
922
}
970
923
}
971
924
}
972
925
}
973
/* If this plugin has any environment variables, we need to
974
duplicate the environment from this process, too. */
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
928
process, too. */
975
929
if(p->environ[0] != NULL){
976
930
for(char **e = environ; *e != NULL; e++){
977
931
if(not add_environment(p, *e, false)){
978
error(0, errno, "add_environment");
932
perror("add_environment");
979
933
}
980
934
}
981
935
}
982
936
983
937
int pipefd[2];
984
#ifndef O_CLOEXEC
985
938
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 */
989
939
if(ret == -1){
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
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
1005
944
/* Ask OS to automatic close the pipe on exec */
1006
945
ret = set_cloexec_flag(pipefd[0]);
1007
946
if(ret < 0){
1008
error(0, errno, "set_cloexec_flag");
1009
close(pipefd[0]);
1010
close(pipefd[1]);
947
perror("set_cloexec_flag");
1011
948
exitstatus = EX_OSERR;
1012
free(direntries[i]);
1013
949
goto fallback;
1014
950
}
1015
951
ret = set_cloexec_flag(pipefd[1]);
1016
952
if(ret < 0){
1017
error(0, errno, "set_cloexec_flag");
1018
close(pipefd[0]);
1019
close(pipefd[1]);
953
perror("set_cloexec_flag");
1020
954
exitstatus = EX_OSERR;
1021
free(direntries[i]);
1022
955
goto fallback;
1023
956
}
1024
#endif /* not O_CLOEXEC */
1025
957
/* Block SIGCHLD until process is safely in process list */
1026
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1027
959
&sigchld_action.sa_mask,
1028
960
NULL));
1029
961
if(ret < 0){
1030
error(0, errno, "sigprocmask");
962
perror("sigprocmask");
1031
963
exitstatus = EX_OSERR;
1032
free(direntries[i]);
1033
964
goto fallback;
1034
965
}
1035
966
/* Starting a new process to be watched */
1038
969
pid = fork();
1039
970
} while(pid == -1 and errno == EINTR);
1040
971
if(pid == -1){
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]);
972
perror("fork");
1046
973
exitstatus = EX_OSERR;
1047
free(direntries[i]);
1048
974
goto fallback;
1049
975
}
1050
976
if(pid == 0){
1051
977
/* this is the child process */
1052
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
979
if(ret < 0){
1054
error(0, errno, "sigaction");
980
perror("sigaction");
1055
981
_exit(EX_OSERR);
1056
982
}
1057
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1058
984
if(ret < 0){
1059
error(0, errno, "sigprocmask");
985
perror("sigprocmask");
1060
986
_exit(EX_OSERR);
1061
987
}
1062
988
1063
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1064
990
if(ret == -1){
1065
error(0, errno, "dup2");
991
perror("dup2");
1066
992
_exit(EX_OSERR);
1067
993
}
1068
994
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);
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
}
1075
1010
}
1076
1011
/* no return */
1077
1012
}
1078
1013
/* Parent process */
1079
close(pipefd[1]); /* Close unused write end of pipe */
1080
close(plugin_fd);
1081
plugin *new_plugin = getplugin(direntries[i]->d_name);
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
1016
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1082
1018
if(new_plugin == NULL){
1083
error(0, errno, "getplugin");
1019
perror("getplugin");
1084
1020
ret = (int)(TEMP_FAILURE_RETRY
1085
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1086
1022
NULL)));
1087
1023
if(ret < 0){
1088
error(0, errno, "sigprocmask");
1024
perror("sigprocmask");
1089
1025
}
1090
1026
exitstatus = EX_OSERR;
1091
free(direntries[i]);
1092
1027
goto fallback;
1093
1028
}
1094
free(direntries[i]);
1095
1029
1096
1030
new_plugin->pid = pid;
1097
1031
new_plugin->fd = pipefd[0];
1098
1099
if(debug){
1100
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1101
new_plugin->name, (intmax_t) (new_plugin->pid));
1102
}
1103
1032
1104
1033
/* Unblock SIGCHLD so signal handler can be run if this process
1105
1034
has already completed */
1106
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1107
1036
&sigchld_action.sa_mask,
1108
1037
NULL));
1109
1038
if(ret < 0){
1110
error(0, errno, "sigprocmask");
1039
perror("sigprocmask");
1111
1040
exitstatus = EX_OSERR;
1112
1041
goto fallback;
1113
1042
}
1114
1043
1115
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1116
1046
1117
1047
if(maxfd < new_plugin->fd){
1118
1048
maxfd = new_plugin->fd;
1119
1049
}
1120
1050
}
1121
1051
1122
free(direntries);
1123
direntries = NULL;
1124
close(dir_fd);
1125
dir_fd = -1;
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1126
1054
free_plugin(getplugin(NULL));
1127
1055
1128
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1141
1069
fd_set rfds = rfds_all;
1142
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1143
1071
if(select_ret == -1 and errno != EINTR){
1144
error(0, errno, "select");
1072
perror("select");
1145
1073
exitstatus = EX_OSERR;
1146
1074
goto fallback;
1147
1075
}
1167
1095
(intmax_t) (proc->pid),
1168
1096
WTERMSIG(proc->status),
1169
1097
strsignal(WTERMSIG(proc->status)));
1098
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
1170
1101
}
1171
1102
}
1172
1103
1173
1104
/* Remove the plugin */
1174
FD_CLR(proc->fd, &rfds_all);
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1175
1107
1176
1108
/* Block signal while modifying process_list */
1177
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
1111
&sigchld_action.sa_mask,
1180
1112
NULL));
1181
1113
if(ret < 0){
1182
error(0, errno, "sigprocmask");
1114
perror("sigprocmask");
1183
1115
exitstatus = EX_OSERR;
1184
1116
goto fallback;
1185
1117
}
1193
1125
(sigprocmask(SIG_UNBLOCK,
1194
1126
&sigchld_action.sa_mask, NULL)));
1195
1127
if(ret < 0){
1196
error(0, errno, "sigprocmask");
1128
perror("sigprocmask");
1197
1129
exitstatus = EX_OSERR;
1198
1130
goto fallback;
1199
1131
}
1210
1142
bool bret = print_out_password(proc->buffer,
1211
1143
proc->buffer_length);
1212
1144
if(not bret){
1213
error(0, errno, "print_out_password");
1145
perror("print_out_password");
1214
1146
exitstatus = EX_IOERR;
1215
1147
}
1216
1148
goto fallback;
1217
1149
}
1218
1150
1219
1151
/* This process has not completed. Does it have any output? */
1220
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1221
1155
/* This process had nothing to say at this time */
1222
1156
proc = proc->next;
1223
1157
continue;
1224
1158
}
1225
1159
/* Before reading, make the process' data buffer large enough */
1226
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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");
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
1231
1165
exitstatus = EX_OSERR;
1232
1166
goto fallback;
1233
1167
}
1234
proc->buffer = new_buffer;
1235
1168
proc->buffer_size += BUFFER_SIZE;
1236
1169
}
1237
1170
/* Read from the process */
1271
1204
}
1272
1205
bret = print_out_password(passwordbuffer, len);
1273
1206
if(not bret){
1274
error(0, errno, "print_out_password");
1207
perror("print_out_password");
1275
1208
exitstatus = EX_IOERR;
1276
1209
}
1277
1210
}
1279
1212
/* Restore old signal handler */
1280
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1281
1214
if(ret == -1){
1282
error(0, errno, "sigaction");
1215
perror("sigaction");
1283
1216
exitstatus = EX_OSERR;
1284
1217
}
1285
1218
1290
1223
free(custom_argv);
1291
1224
}
1292
1225
1293
free(direntries);
1294
1295
if(dir_fd != -1){
1296
close(dir_fd);
1226
if(dir != NULL){
1227
closedir(dir);
1297
1228
}
1298
1229
1299
1230
/* Kill the processes */
1303
1234
ret = kill(p->pid, SIGTERM);
1304
1235
if(ret == -1 and errno != ESRCH){
1305
1236
/* Set-uid proccesses might not get closed */
1306
error(0, errno, "kill");
1237
perror("kill");
1307
1238
}
1308
1239
}
1309
1240
}
1313
1244
ret = wait(NULL);
1314
1245
} while(ret >= 0);
1315
1246
if(errno != ECHILD){
1316
error(0, errno, "wait");
1247
perror("wait");
1317
1248
}
1318
1249
1319
1250
free_plugin_list();
1320
1251
1321
1252
free(plugindir);
1322
free(pluginhelperdir);
1323
1253
free(argfile);
1324
1254
1325
1255
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0