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- Committer: Teddy Hogeborn
- Date: 2016-11-26 23:18:55 UTC
- Revision ID: teddy@recompile.se-20161126231855-vseam120ph8856a1
Add more PEP8 compliance (as per the "pycodestyle" tool).
* mandos: Add an empty line to be more PEP8 compliant.
* mandos-monitor: - '' -
* mandos: Add an empty line to be more PEP8 compliant.
* mandos-monitor: - '' -
- files added:
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
O_CLOEXEC, pipe2() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#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() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
42
#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() */
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
50
*/
54
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
68
66
*/
69
67
#include <errno.h> /* errno, EBADF */
70
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
72
74
73
75
#define BUFFER_SIZE 256
74
76
75
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
76
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
80
78
81
const char *argp_program_version = "plugin-runner " VERSION;
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
83
81
84
typedef struct plugin{
82
85
char *name; /* can be NULL or any plugin name */
102
105
103
106
/* Gets an existing plugin based on name,
104
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
105
109
static plugin *getplugin(char *name){
106
110
/* Check for existing plugin with that name */
107
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
168
172
}
169
173
170
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
171
176
static bool add_to_char_array(const char *new, char ***array,
172
177
int *len){
173
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
174
180
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
178
184
/* Malloc check */
179
if(*array == NULL){
185
if(new_array == NULL){
180
186
return false;
181
187
}
188
*array = new_array;
182
189
/* Make a copy of the new string */
183
190
char *copy;
184
191
do {
196
203
}
197
204
198
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
199
207
static bool add_argument(plugin *p, const char *arg){
200
208
if(p == NULL){
201
209
return false;
204
212
}
205
213
206
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
207
216
static bool add_environment(plugin *p, const char *def, bool replace){
208
217
if(p == NULL){
209
218
return false;
211
220
/* namelen = length of name of environment variable */
212
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
222
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
216
225
/* It already exists */
217
226
if(replace){
218
char *new;
227
char *new_envdef;
219
228
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
222
if(new == NULL){
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
223
232
return false;
224
233
}
225
*e = new;
226
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
227
236
}
228
237
return true;
229
238
}
231
240
return add_to_char_array(def, &(p->environ), &(p->envc));
232
241
}
233
242
243
#ifndef O_CLOEXEC
234
244
/*
235
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
246
* Descriptor Flags".
237
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
238
248
*/
249
__attribute__((warn_unused_result))
239
250
static int set_cloexec_flag(int fd){
240
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
241
252
/* If reading the flags failed, return error indication now. */
246
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
258
ret | FD_CLOEXEC));
248
259
}
260
#endif /* not O_CLOEXEC */
249
261
250
262
251
263
/* Mark processes as completed when they exit, and save their exit
265
277
/* No child processes */
266
278
break;
267
279
}
268
perror("waitpid");
280
error(0, errno, "waitpid");
269
281
}
270
282
271
283
/* A child exited, find it in process_list */
283
295
}
284
296
285
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
286
299
static bool print_out_password(const char *buffer, size_t length){
287
300
ssize_t ret;
288
301
for(size_t written = 0; written < length; written += (size_t)ret){
296
309
}
297
310
298
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
299
313
static void free_plugin(plugin *plugin_node){
300
314
301
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
333
347
334
348
int main(int argc, char *argv[]){
335
349
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
336
351
char *argfile = NULL;
337
352
FILE *conffp;
338
size_t d_name_len;
339
DIR *dir = NULL;
340
struct dirent *dirst;
353
struct dirent **direntries = NULL;
341
354
struct stat st;
342
355
fd_set rfds_all;
343
356
int ret, maxfd = 0;
351
364
.sa_flags = SA_NOCLDSTOP };
352
365
char **custom_argv = NULL;
353
366
int custom_argc = 0;
367
int dir_fd = -1;
354
368
355
369
/* Establish a signal handler */
356
370
sigemptyset(&sigchld_action.sa_mask);
357
371
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
372
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
361
375
goto fallback;
362
376
}
363
377
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
378
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
367
381
goto fallback;
368
382
}
369
383
401
415
.doc = "Group ID the plugins will run as", .group = 3 },
402
416
{ .name = "debug", .key = 132,
403
417
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
404
422
/*
405
423
* These reproduce what we would get without ARGP_NO_HELP
406
424
*/
413
431
{ .name = NULL }
414
432
};
415
433
434
__attribute__((nonnull(3)))
416
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
436
errno = 0;
418
437
switch(key){
419
438
char *tmp;
420
intmax_t tmpmax;
439
intmax_t tmp_id;
421
440
case 'g': /* --global-options */
422
441
{
423
442
char *plugin_option;
426
445
break;
427
446
}
428
447
}
448
errno = 0;
429
449
}
430
450
break;
431
451
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
454
}
433
455
break;
434
456
case 'o': /* --options-for */
435
457
{
452
474
break;
453
475
}
454
476
}
477
errno = 0;
455
478
}
456
479
break;
457
480
case 'E': /* --env-for */
469
492
errno = EINVAL;
470
493
break;
471
494
}
472
add_environment(getplugin(arg), envdef, true);
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
497
}
473
498
}
474
499
break;
475
500
case 'd': /* --disable */
477
502
plugin *p = getplugin(arg);
478
503
if(p != NULL){
479
504
p->disabled = true;
505
errno = 0;
480
506
}
481
507
}
482
508
break;
485
511
plugin *p = getplugin(arg);
486
512
if(p != NULL){
487
513
p->disabled = false;
514
errno = 0;
488
515
}
489
516
}
490
517
break;
491
518
case 128: /* --plugin-dir */
492
519
free(plugindir);
493
520
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
494
524
break;
495
525
case 129: /* --config-file */
496
526
/* This is already done by parse_opt_config_file() */
497
527
break;
498
528
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
529
tmp_id = strtoimax(arg, &tmp, 10);
500
530
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
531
or tmp_id != (uid_t)tmp_id){
502
532
argp_error(state, "Bad user ID number: \"%s\", using %"
503
533
PRIdMAX, arg, (intmax_t)uid);
504
534
break;
505
535
}
506
uid = (uid_t)tmpmax;
536
uid = (uid_t)tmp_id;
537
errno = 0;
507
538
break;
508
539
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
540
tmp_id = strtoimax(arg, &tmp, 10);
510
541
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
542
or tmp_id != (gid_t)tmp_id){
512
543
argp_error(state, "Bad group ID number: \"%s\", using %"
513
544
PRIdMAX, arg, (intmax_t)gid);
514
545
break;
515
546
}
516
gid = (gid_t)tmpmax;
547
gid = (gid_t)tmp_id;
548
errno = 0;
517
549
break;
518
550
case 132: /* --debug */
519
551
debug = true;
520
552
break;
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
521
560
/*
522
561
* These reproduce what we would get without ARGP_NO_HELP
523
562
*/
567
606
case 129: /* --config-file */
568
607
free(argfile);
569
608
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
611
}
570
612
break;
571
613
case 130: /* --userid */
572
614
case 131: /* --groupid */
573
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
574
617
case '?': /* --help */
575
618
case -3: /* --usage */
576
619
case 'V': /* --version */
598
641
case ENOMEM:
599
642
default:
600
643
errno = ret;
601
perror("argp_parse");
644
error(0, errno, "argp_parse");
602
645
exitstatus = EX_OSERR;
603
646
goto fallback;
604
647
case EINVAL:
625
668
custom_argc = 1;
626
669
custom_argv = malloc(sizeof(char*) * 2);
627
670
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
630
673
goto fallback;
631
674
}
632
675
custom_argv[0] = argv[0];
648
691
}
649
692
new_arg = strdup(p);
650
693
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
653
696
free(org_line);
654
697
goto fallback;
655
698
}
656
699
657
700
custom_argc += 1;
658
custom_argv = realloc(custom_argv, sizeof(char *)
659
* ((unsigned int) custom_argc + 1));
660
if(custom_argv == NULL){
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
663
free(org_line);
664
goto fallback;
701
{
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
707
free(new_arg);
708
free(org_line);
709
goto fallback;
710
} else {
711
custom_argv = new_argv;
712
}
665
713
}
666
714
custom_argv[custom_argc-1] = new_arg;
667
715
custom_argv[custom_argc] = NULL;
671
719
ret = fclose(conffp);
672
720
} while(ret == EOF and errno == EINTR);
673
721
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
676
724
goto fallback;
677
725
}
678
726
free(org_line);
680
728
/* Check for harmful errors and go to fallback. Other errors might
681
729
not affect opening plugins */
682
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
685
733
goto fallback;
686
734
}
687
735
}
697
745
case ENOMEM:
698
746
default:
699
747
errno = ret;
700
perror("argp_parse");
748
error(0, errno, "argp_parse");
701
749
exitstatus = EX_OSERR;
702
750
goto fallback;
703
751
case EINVAL:
717
765
case ENOMEM:
718
766
default:
719
767
errno = ret;
720
perror("argp_parse");
768
error(0, errno, "argp_parse");
721
769
exitstatus = EX_OSERR;
722
770
goto fallback;
723
771
case EINVAL:
725
773
goto fallback;
726
774
}
727
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
791
}
792
}
793
728
794
if(debug){
729
795
for(plugin *p = plugin_list; p != NULL; p=p->next){
730
796
fprintf(stderr, "Plugin: %s has %d arguments\n",
739
805
}
740
806
}
741
807
742
/* Strip permissions down to nobody */
743
setgid(gid);
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<https://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
813
if(errno != ENOENT){
814
error(0, errno, "open(\"" PDIR "\")");
815
}
816
} else {
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
818
if(ret == -1){
819
error(0, errno, "fstat");
820
} else {
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
823
if(ret == -1){
824
error(0, errno, "fchown");
825
}
826
}
827
}
828
close(plugindir_fd);
829
}
830
}
831
832
/* Lower permissions */
833
ret = setgid(gid);
744
834
if(ret == -1){
745
perror("setgid");
835
error(0, errno, "setgid");
746
836
}
747
837
ret = setuid(uid);
748
838
if(ret == -1){
749
perror("setuid");
839
error(0, errno, "setuid");
750
840
}
751
841
752
842
/* Open plugin directory with close_on_exec flag */
753
843
{
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
845
#ifdef O_CLOEXEC
846
O_CLOEXEC
847
#else /* not O_CLOEXEC */
848
0
849
#endif /* not O_CLOEXEC */
850
);
772
851
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
775
854
goto fallback;
776
855
}
777
856
779
858
/* Set the FD_CLOEXEC flag on the directory */
780
859
ret = set_cloexec_flag(dir_fd);
781
860
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
785
863
goto fallback;
786
864
}
787
865
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
866
}
867
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
882
!= FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
886
}
887
return 0;
888
}
795
889
}
890
return 1;
891
}
892
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
894
alphasort);
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
897
direntries = NULL;
898
exitstatus = EX_OSERR;
899
goto fallback;
796
900
}
797
901
798
902
FD_ZERO(&rfds_all);
799
903
800
904
/* Read and execute any executable in the plugin directory*/
801
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
805
806
/* All directory entries have been processed */
807
if(dirst == NULL){
808
if(errno == EBADF){
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
811
goto fallback;
812
}
813
break;
814
}
815
816
d_name_len = strlen(dirst->d_name);
817
818
/* Ignore dotfiles, backup files and other junk */
819
{
820
bool bad_name = false;
821
822
const char const *bad_prefixes[] = { ".", "#", NULL };
823
824
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
".dpkg-old",
826
".dpkg-bak",
827
".dpkg-divert", NULL };
828
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
size_t pre_len = strlen(*pre);
830
if((d_name_len >= pre_len)
831
and strncmp((dirst->d_name), *pre, pre_len) == 0){
832
if(debug){
833
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
834
" with bad prefix %s\n", dirst->d_name, *pre);
835
}
836
bad_name = true;
837
break;
838
}
839
}
840
if(bad_name){
841
continue;
842
}
843
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
844
size_t suf_len = strlen(*suf);
845
if((d_name_len >= suf_len)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
847
== 0)){
848
if(debug){
849
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
850
" with bad suffix %s\n", dirst->d_name, *suf);
851
}
852
bad_name = true;
853
break;
854
}
855
}
856
857
if(bad_name){
858
continue;
859
}
860
}
861
862
char *filename;
863
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
866
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
870
}
871
if(ret < 0){
872
perror("asprintf");
905
for(int i = 0; i < numplugins; i++){
906
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
908
if(plugin_fd == -1){
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
873
911
continue;
874
912
}
875
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
877
914
if(ret == -1){
878
perror("stat");
879
free(filename);
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
880
918
continue;
881
919
}
882
920
883
921
/* Ignore non-executable files */
884
922
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
886
925
if(debug){
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
" with bad type or mode\n", filename);
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
889
930
}
890
free(filename);
931
close(plugin_fd);
932
free(direntries[i]);
891
933
continue;
892
934
}
893
935
894
plugin *p = getplugin(dirst->d_name);
936
plugin *p = getplugin(direntries[i]->d_name);
895
937
if(p == NULL){
896
perror("getplugin");
897
free(filename);
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
898
941
continue;
899
942
}
900
943
if(p->disabled){
901
944
if(debug){
902
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
903
dirst->d_name);
946
direntries[i]->d_name);
904
947
}
905
free(filename);
948
close(plugin_fd);
949
free(direntries[i]);
906
950
continue;
907
951
}
908
952
{
911
955
if(g != NULL){
912
956
for(char **a = g->argv + 1; *a != NULL; a++){
913
957
if(not add_argument(p, *a)){
914
perror("add_argument");
958
error(0, errno, "add_argument");
915
959
}
916
960
}
917
961
/* Add global environment variables */
918
962
for(char **e = g->environ; *e != NULL; e++){
919
963
if(not add_environment(p, *e, false)){
920
perror("add_environment");
964
error(0, errno, "add_environment");
921
965
}
922
966
}
923
967
}
924
968
}
925
/* If this plugin has any environment variables, we will call
926
using execve and need to duplicate the environment from this
927
process, too. */
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
928
971
if(p->environ[0] != NULL){
929
972
for(char **e = environ; *e != NULL; e++){
930
973
if(not add_environment(p, *e, false)){
931
perror("add_environment");
974
error(0, errno, "add_environment");
932
975
}
933
976
}
934
977
}
935
978
936
979
int pipefd[2];
980
#ifndef O_CLOEXEC
937
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
938
985
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
941
goto fallback;
942
}
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
990
}
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
#ifndef O_CLOEXEC
943
1001
/* Ask OS to automatic close the pipe on exec */
944
1002
ret = set_cloexec_flag(pipefd[0]);
945
1003
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
948
1009
goto fallback;
949
1010
}
950
1011
ret = set_cloexec_flag(pipefd[1]);
951
1012
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
954
1018
goto fallback;
955
1019
}
1020
#endif /* not O_CLOEXEC */
956
1021
/* Block SIGCHLD until process is safely in process list */
957
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
1023
&sigchld_action.sa_mask,
959
1024
NULL));
960
1025
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
963
1029
goto fallback;
964
1030
}
965
1031
/* Starting a new process to be watched */
968
1034
pid = fork();
969
1035
} while(pid == -1 and errno == EINTR);
970
1036
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
973
1044
goto fallback;
974
1045
}
975
1046
if(pid == 0){
976
1047
/* this is the child process */
977
1048
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
1049
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
981
1052
}
982
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
1054
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
986
1057
}
987
1058
988
1059
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
1060
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
992
1063
}
993
1064
994
if(dirfd(dir) < 0){
995
/* If dir has no file descriptor, we could not set FD_CLOEXEC
996
above and must now close it manually here. */
997
closedir(dir);
998
}
999
if(p->environ[0] == NULL){
1000
if(execv(filename, p->argv) < 0){
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1003
}
1004
} else {
1005
if(execve(filename, p->argv, p->environ) < 0){
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1008
}
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1070
_exit(EX_OSERR);
1009
1071
}
1010
1072
/* no return */
1011
1073
}
1012
1074
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
1015
free(filename);
1016
plugin *new_plugin = getplugin(dirst->d_name);
1075
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1017
1078
if(new_plugin == NULL){
1018
perror("getplugin");
1079
error(0, errno, "getplugin");
1019
1080
ret = (int)(TEMP_FAILURE_RETRY
1020
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
1082
NULL)));
1022
1083
if(ret < 0){
1023
perror("sigprocmask");
1084
error(0, errno, "sigprocmask");
1024
1085
}
1025
exitstatus = EXIT_FAILURE;
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
1026
1088
goto fallback;
1027
1089
}
1090
free(direntries[i]);
1028
1091
1029
1092
new_plugin->pid = pid;
1030
1093
new_plugin->fd = pipefd[0];
1035
1098
&sigchld_action.sa_mask,
1036
1099
NULL));
1037
1100
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
1040
1103
goto fallback;
1041
1104
}
1042
1105
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
1106
FD_SET(new_plugin->fd, &rfds_all);
1045
1107
1046
1108
if(maxfd < new_plugin->fd){
1047
1109
maxfd = new_plugin->fd;
1048
1110
}
1049
1111
}
1050
1112
1051
TEMP_FAILURE_RETRY(closedir(dir));
1052
dir = NULL;
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1053
1117
free_plugin(getplugin(NULL));
1054
1118
1055
1119
for(plugin *p = plugin_list; p != NULL; p = p->next){
1068
1132
fd_set rfds = rfds_all;
1069
1133
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
1134
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
1073
1137
goto fallback;
1074
1138
}
1075
1139
/* OK, now either a process completed, or something can be read
1094
1158
(intmax_t) (proc->pid),
1095
1159
WTERMSIG(proc->status),
1096
1160
strsignal(WTERMSIG(proc->status)));
1097
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
1100
1161
}
1101
1162
}
1102
1163
1103
1164
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1165
FD_CLR(proc->fd, &rfds_all);
1106
1166
1107
1167
/* Block signal while modifying process_list */
1108
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
1170
&sigchld_action.sa_mask,
1111
1171
NULL));
1112
1172
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
1115
1175
goto fallback;
1116
1176
}
1117
1177
1124
1184
(sigprocmask(SIG_UNBLOCK,
1125
1185
&sigchld_action.sa_mask, NULL)));
1126
1186
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1129
1189
goto fallback;
1130
1190
}
1131
1191
1141
1201
bool bret = print_out_password(proc->buffer,
1142
1202
proc->buffer_length);
1143
1203
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
1146
1206
}
1147
1207
goto fallback;
1148
1208
}
1149
1209
1150
1210
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1212
/* This process had nothing to say at this time */
1155
1213
proc = proc->next;
1156
1214
continue;
1157
1215
}
1158
1216
/* Before reading, make the process' data buffer large enough */
1159
1217
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
1165
1223
goto fallback;
1166
1224
}
1225
proc->buffer = new_buffer;
1167
1226
proc->buffer_size += BUFFER_SIZE;
1168
1227
}
1169
1228
/* Read from the process */
1188
1247
1189
1248
fallback:
1190
1249
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1192
1252
/* Fallback if all plugins failed, none are found or an error
1193
1253
occured */
1194
1254
bool bret;
1202
1262
}
1203
1263
bret = print_out_password(passwordbuffer, len);
1204
1264
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
1207
1267
}
1208
1268
}
1209
1269
1210
1270
/* Restore old signal handler */
1211
1271
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
1272
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1215
1275
}
1216
1276
1217
1277
if(custom_argv != NULL){
1221
1281
free(custom_argv);
1222
1282
}
1223
1283
1224
if(dir != NULL){
1225
closedir(dir);
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1226
1288
}
1227
1289
1228
1290
/* Kill the processes */
1232
1294
ret = kill(p->pid, SIGTERM);
1233
1295
if(ret == -1 and errno != ESRCH){
1234
1296
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1297
error(0, errno, "kill");
1236
1298
}
1237
1299
}
1238
1300
}
1242
1304
ret = wait(NULL);
1243
1305
} while(ret >= 0);
1244
1306
if(errno != ECHILD){
1245
perror("wait");
1307
error(0, errno, "wait");
1246
1308
}
1247
1309
1248
1310
free_plugin_list();
1249
1311
1250
1312
free(plugindir);
1313
free(pluginhelperdir);
1251
1314
free(argfile);
1252
1315
1253
1316
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0