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- Committer: Teddy Hogeborn
- Date: 2016-11-26 23:18:55 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 356.
- 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
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
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,
70
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
73
74
74
75
#define BUFFER_SIZE 256
75
76
76
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
77
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
80
79
81
const char *argp_program_version = "plugin-runner " VERSION;
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
81
83
82
84
typedef struct plugin{
83
85
char *name; /* can be NULL or any plugin name */
103
105
104
106
/* Gets an existing plugin based on name,
105
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
106
109
static plugin *getplugin(char *name){
107
110
/* Check for existing plugin with that name */
108
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
169
172
}
170
173
171
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
172
176
static bool add_to_char_array(const char *new, char ***array,
173
177
int *len){
174
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
175
180
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} 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);
179
184
/* Malloc check */
180
if(*array == NULL){
185
if(new_array == NULL){
181
186
return false;
182
187
}
188
*array = new_array;
183
189
/* Make a copy of the new string */
184
190
char *copy;
185
191
do {
197
203
}
198
204
199
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
200
207
static bool add_argument(plugin *p, const char *arg){
201
208
if(p == NULL){
202
209
return false;
205
212
}
206
213
207
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
208
216
static bool add_environment(plugin *p, const char *def, bool replace){
209
217
if(p == NULL){
210
218
return false;
212
220
/* namelen = length of name of environment variable */
213
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
222
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
217
225
/* It already exists */
218
226
if(replace){
219
char *new;
227
char *new_envdef;
220
228
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
224
232
return false;
225
233
}
226
*e = new;
227
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
228
236
}
229
237
return true;
230
238
}
232
240
return add_to_char_array(def, &(p->environ), &(p->envc));
233
241
}
234
242
243
#ifndef O_CLOEXEC
235
244
/*
236
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
246
* Descriptor Flags".
238
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
239
248
*/
249
__attribute__((warn_unused_result))
240
250
static int set_cloexec_flag(int fd){
241
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
242
252
/* If reading the flags failed, return error indication now. */
247
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
258
ret | FD_CLOEXEC));
249
259
}
260
#endif /* not O_CLOEXEC */
250
261
251
262
252
263
/* Mark processes as completed when they exit, and save their exit
266
277
/* No child processes */
267
278
break;
268
279
}
269
perror("waitpid");
280
error(0, errno, "waitpid");
270
281
}
271
282
272
283
/* A child exited, find it in process_list */
284
295
}
285
296
286
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
287
299
static bool print_out_password(const char *buffer, size_t length){
288
300
ssize_t ret;
289
301
for(size_t written = 0; written < length; written += (size_t)ret){
297
309
}
298
310
299
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
300
313
static void free_plugin(plugin *plugin_node){
301
314
302
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
334
347
335
348
int main(int argc, char *argv[]){
336
349
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
337
351
char *argfile = NULL;
338
352
FILE *conffp;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
353
struct dirent **direntries = NULL;
342
354
struct stat st;
343
355
fd_set rfds_all;
344
356
int ret, maxfd = 0;
352
364
.sa_flags = SA_NOCLDSTOP };
353
365
char **custom_argv = NULL;
354
366
int custom_argc = 0;
367
int dir_fd = -1;
355
368
356
369
/* Establish a signal handler */
357
370
sigemptyset(&sigchld_action.sa_mask);
358
371
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
372
if(ret == -1){
360
perror("sigaddset");
373
error(0, errno, "sigaddset");
361
374
exitstatus = EX_OSERR;
362
375
goto fallback;
363
376
}
364
377
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
378
if(ret == -1){
366
perror("sigaction");
379
error(0, errno, "sigaction");
367
380
exitstatus = EX_OSERR;
368
381
goto fallback;
369
382
}
402
415
.doc = "Group ID the plugins will run as", .group = 3 },
403
416
{ .name = "debug", .key = 132,
404
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 },
405
422
/*
406
423
* These reproduce what we would get without ARGP_NO_HELP
407
424
*/
414
431
{ .name = NULL }
415
432
};
416
433
434
__attribute__((nonnull(3)))
417
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
436
errno = 0;
419
437
switch(key){
420
438
char *tmp;
421
intmax_t tmpmax;
439
intmax_t tmp_id;
422
440
case 'g': /* --global-options */
423
441
{
424
442
char *plugin_option;
427
445
break;
428
446
}
429
447
}
448
errno = 0;
430
449
}
431
450
break;
432
451
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
454
}
434
455
break;
435
456
case 'o': /* --options-for */
436
457
{
453
474
break;
454
475
}
455
476
}
477
errno = 0;
456
478
}
457
479
break;
458
480
case 'E': /* --env-for */
470
492
errno = EINVAL;
471
493
break;
472
494
}
473
add_environment(getplugin(arg), envdef, true);
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
497
}
474
498
}
475
499
break;
476
500
case 'd': /* --disable */
478
502
plugin *p = getplugin(arg);
479
503
if(p != NULL){
480
504
p->disabled = true;
505
errno = 0;
481
506
}
482
507
}
483
508
break;
486
511
plugin *p = getplugin(arg);
487
512
if(p != NULL){
488
513
p->disabled = false;
514
errno = 0;
489
515
}
490
516
}
491
517
break;
492
518
case 128: /* --plugin-dir */
493
519
free(plugindir);
494
520
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
495
524
break;
496
525
case 129: /* --config-file */
497
526
/* This is already done by parse_opt_config_file() */
498
527
break;
499
528
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
529
tmp_id = strtoimax(arg, &tmp, 10);
501
530
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
531
or tmp_id != (uid_t)tmp_id){
503
532
argp_error(state, "Bad user ID number: \"%s\", using %"
504
533
PRIdMAX, arg, (intmax_t)uid);
505
534
break;
506
535
}
507
uid = (uid_t)tmpmax;
536
uid = (uid_t)tmp_id;
537
errno = 0;
508
538
break;
509
539
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
540
tmp_id = strtoimax(arg, &tmp, 10);
511
541
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
542
or tmp_id != (gid_t)tmp_id){
513
543
argp_error(state, "Bad group ID number: \"%s\", using %"
514
544
PRIdMAX, arg, (intmax_t)gid);
515
545
break;
516
546
}
517
gid = (gid_t)tmpmax;
547
gid = (gid_t)tmp_id;
548
errno = 0;
518
549
break;
519
550
case 132: /* --debug */
520
551
debug = true;
521
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;
522
560
/*
523
561
* These reproduce what we would get without ARGP_NO_HELP
524
562
*/
568
606
case 129: /* --config-file */
569
607
free(argfile);
570
608
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
611
}
571
612
break;
572
613
case 130: /* --userid */
573
614
case 131: /* --groupid */
574
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
575
617
case '?': /* --help */
576
618
case -3: /* --usage */
577
619
case 'V': /* --version */
599
641
case ENOMEM:
600
642
default:
601
643
errno = ret;
602
perror("argp_parse");
644
error(0, errno, "argp_parse");
603
645
exitstatus = EX_OSERR;
604
646
goto fallback;
605
647
case EINVAL:
626
668
custom_argc = 1;
627
669
custom_argv = malloc(sizeof(char*) * 2);
628
670
if(custom_argv == NULL){
629
perror("malloc");
671
error(0, errno, "malloc");
630
672
exitstatus = EX_OSERR;
631
673
goto fallback;
632
674
}
649
691
}
650
692
new_arg = strdup(p);
651
693
if(new_arg == NULL){
652
perror("strdup");
694
error(0, errno, "strdup");
653
695
exitstatus = EX_OSERR;
654
696
free(org_line);
655
697
goto fallback;
656
698
}
657
699
658
700
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;
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
}
666
713
}
667
714
custom_argv[custom_argc-1] = new_arg;
668
715
custom_argv[custom_argc] = NULL;
672
719
ret = fclose(conffp);
673
720
} while(ret == EOF and errno == EINTR);
674
721
if(ret == EOF){
675
perror("fclose");
722
error(0, errno, "fclose");
676
723
exitstatus = EX_IOERR;
677
724
goto fallback;
678
725
}
681
728
/* Check for harmful errors and go to fallback. Other errors might
682
729
not affect opening plugins */
683
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
685
exitstatus = EX_IOERR;
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
686
733
goto fallback;
687
734
}
688
735
}
698
745
case ENOMEM:
699
746
default:
700
747
errno = ret;
701
perror("argp_parse");
748
error(0, errno, "argp_parse");
702
749
exitstatus = EX_OSERR;
703
750
goto fallback;
704
751
case EINVAL:
718
765
case ENOMEM:
719
766
default:
720
767
errno = ret;
721
perror("argp_parse");
768
error(0, errno, "argp_parse");
722
769
exitstatus = EX_OSERR;
723
770
goto fallback;
724
771
case EINVAL:
726
773
goto fallback;
727
774
}
728
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
729
794
if(debug){
730
795
for(plugin *p = plugin_list; p != NULL; p=p->next){
731
796
fprintf(stderr, "Plugin: %s has %d arguments\n",
740
805
}
741
806
}
742
807
743
/* Strip permissions down to nobody */
744
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);
745
834
if(ret == -1){
746
perror("setgid");
835
error(0, errno, "setgid");
747
836
}
748
837
ret = setuid(uid);
749
838
if(ret == -1){
750
perror("setuid");
839
error(0, errno, "setuid");
751
840
}
752
841
753
842
/* Open plugin directory with close_on_exec flag */
754
843
{
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
}
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
);
773
851
if(dir_fd == -1){
774
perror("Could not open plugin dir");
852
error(0, errno, "Could not open plugin dir");
775
853
exitstatus = EX_UNAVAILABLE;
776
854
goto fallback;
777
855
}
780
858
/* Set the FD_CLOEXEC flag on the directory */
781
859
ret = set_cloexec_flag(dir_fd);
782
860
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
861
error(0, errno, "set_cloexec_flag");
785
862
exitstatus = EX_OSERR;
786
863
goto fallback;
787
864
}
788
865
#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;
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
}
796
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;
797
900
}
798
901
799
902
FD_ZERO(&rfds_all);
800
903
801
904
/* 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");
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]);
874
911
continue;
875
912
}
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
878
914
if(ret == -1){
879
perror("stat");
880
free(filename);
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
881
918
continue;
882
919
}
883
920
884
921
/* Ignore non-executable files */
885
922
if(not S_ISREG(st.st_mode)
886
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)){
887
925
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" 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);
890
930
}
891
free(filename);
931
close(plugin_fd);
932
free(direntries[i]);
892
933
continue;
893
934
}
894
935
895
plugin *p = getplugin(dirst->d_name);
936
plugin *p = getplugin(direntries[i]->d_name);
896
937
if(p == NULL){
897
perror("getplugin");
898
free(filename);
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
899
941
continue;
900
942
}
901
943
if(p->disabled){
902
944
if(debug){
903
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
904
dirst->d_name);
946
direntries[i]->d_name);
905
947
}
906
free(filename);
948
close(plugin_fd);
949
free(direntries[i]);
907
950
continue;
908
951
}
909
952
{
912
955
if(g != NULL){
913
956
for(char **a = g->argv + 1; *a != NULL; a++){
914
957
if(not add_argument(p, *a)){
915
perror("add_argument");
958
error(0, errno, "add_argument");
916
959
}
917
960
}
918
961
/* Add global environment variables */
919
962
for(char **e = g->environ; *e != NULL; e++){
920
963
if(not add_environment(p, *e, false)){
921
perror("add_environment");
964
error(0, errno, "add_environment");
922
965
}
923
966
}
924
967
}
925
968
}
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. */
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
929
971
if(p->environ[0] != NULL){
930
972
for(char **e = environ; *e != NULL; e++){
931
973
if(not add_environment(p, *e, false)){
932
perror("add_environment");
974
error(0, errno, "add_environment");
933
975
}
934
976
}
935
977
}
936
978
937
979
int pipefd[2];
980
#ifndef O_CLOEXEC
938
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 */
939
985
if(ret == -1){
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
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
944
1001
/* Ask OS to automatic close the pipe on exec */
945
1002
ret = set_cloexec_flag(pipefd[0]);
946
1003
if(ret < 0){
947
perror("set_cloexec_flag");
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
948
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
949
1009
goto fallback;
950
1010
}
951
1011
ret = set_cloexec_flag(pipefd[1]);
952
1012
if(ret < 0){
953
perror("set_cloexec_flag");
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
954
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
955
1018
goto fallback;
956
1019
}
1020
#endif /* not O_CLOEXEC */
957
1021
/* Block SIGCHLD until process is safely in process list */
958
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
1023
&sigchld_action.sa_mask,
960
1024
NULL));
961
1025
if(ret < 0){
962
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
963
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
964
1029
goto fallback;
965
1030
}
966
1031
/* Starting a new process to be watched */
969
1034
pid = fork();
970
1035
} while(pid == -1 and errno == EINTR);
971
1036
if(pid == -1){
972
perror("fork");
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]);
973
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
974
1044
goto fallback;
975
1045
}
976
1046
if(pid == 0){
977
1047
/* this is the child process */
978
1048
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
1049
if(ret < 0){
980
perror("sigaction");
1050
error(0, errno, "sigaction");
981
1051
_exit(EX_OSERR);
982
1052
}
983
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
1054
if(ret < 0){
985
perror("sigprocmask");
1055
error(0, errno, "sigprocmask");
986
1056
_exit(EX_OSERR);
987
1057
}
988
1058
989
1059
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
1060
if(ret == -1){
991
perror("dup2");
1061
error(0, errno, "dup2");
992
1062
_exit(EX_OSERR);
993
1063
}
994
1064
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
}
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);
1010
1071
}
1011
1072
/* no return */
1012
1073
}
1013
1074
/* 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);
1075
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1018
1078
if(new_plugin == NULL){
1019
perror("getplugin");
1079
error(0, errno, "getplugin");
1020
1080
ret = (int)(TEMP_FAILURE_RETRY
1021
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
1082
NULL)));
1023
1083
if(ret < 0){
1024
perror("sigprocmask");
1084
error(0, errno, "sigprocmask");
1025
1085
}
1026
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
1027
1088
goto fallback;
1028
1089
}
1090
free(direntries[i]);
1029
1091
1030
1092
new_plugin->pid = pid;
1031
1093
new_plugin->fd = pipefd[0];
1036
1098
&sigchld_action.sa_mask,
1037
1099
NULL));
1038
1100
if(ret < 0){
1039
perror("sigprocmask");
1101
error(0, errno, "sigprocmask");
1040
1102
exitstatus = EX_OSERR;
1041
1103
goto fallback;
1042
1104
}
1043
1105
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1106
FD_SET(new_plugin->fd, &rfds_all);
1046
1107
1047
1108
if(maxfd < new_plugin->fd){
1048
1109
maxfd = new_plugin->fd;
1049
1110
}
1050
1111
}
1051
1112
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1054
1117
free_plugin(getplugin(NULL));
1055
1118
1056
1119
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
1132
fd_set rfds = rfds_all;
1070
1133
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
1134
if(select_ret == -1 and errno != EINTR){
1072
perror("select");
1135
error(0, errno, "select");
1073
1136
exitstatus = EX_OSERR;
1074
1137
goto fallback;
1075
1138
}
1095
1158
(intmax_t) (proc->pid),
1096
1159
WTERMSIG(proc->status),
1097
1160
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
1161
}
1102
1162
}
1103
1163
1104
1164
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1165
FD_CLR(proc->fd, &rfds_all);
1107
1166
1108
1167
/* Block signal while modifying process_list */
1109
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
1170
&sigchld_action.sa_mask,
1112
1171
NULL));
1113
1172
if(ret < 0){
1114
perror("sigprocmask");
1173
error(0, errno, "sigprocmask");
1115
1174
exitstatus = EX_OSERR;
1116
1175
goto fallback;
1117
1176
}
1125
1184
(sigprocmask(SIG_UNBLOCK,
1126
1185
&sigchld_action.sa_mask, NULL)));
1127
1186
if(ret < 0){
1128
perror("sigprocmask");
1187
error(0, errno, "sigprocmask");
1129
1188
exitstatus = EX_OSERR;
1130
1189
goto fallback;
1131
1190
}
1142
1201
bool bret = print_out_password(proc->buffer,
1143
1202
proc->buffer_length);
1144
1203
if(not bret){
1145
perror("print_out_password");
1204
error(0, errno, "print_out_password");
1146
1205
exitstatus = EX_IOERR;
1147
1206
}
1148
1207
goto fallback;
1149
1208
}
1150
1209
1151
1210
/* 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 */
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1212
/* This process had nothing to say at this time */
1156
1213
proc = proc->next;
1157
1214
continue;
1158
1215
}
1159
1216
/* Before reading, make the process' data buffer large enough */
1160
1217
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");
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");
1165
1222
exitstatus = EX_OSERR;
1166
1223
goto fallback;
1167
1224
}
1225
proc->buffer = new_buffer;
1168
1226
proc->buffer_size += BUFFER_SIZE;
1169
1227
}
1170
1228
/* Read from the process */
1204
1262
}
1205
1263
bret = print_out_password(passwordbuffer, len);
1206
1264
if(not bret){
1207
perror("print_out_password");
1265
error(0, errno, "print_out_password");
1208
1266
exitstatus = EX_IOERR;
1209
1267
}
1210
1268
}
1212
1270
/* Restore old signal handler */
1213
1271
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1272
if(ret == -1){
1215
perror("sigaction");
1273
error(0, errno, "sigaction");
1216
1274
exitstatus = EX_OSERR;
1217
1275
}
1218
1276
1223
1281
free(custom_argv);
1224
1282
}
1225
1283
1226
if(dir != NULL){
1227
closedir(dir);
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1228
1288
}
1229
1289
1230
1290
/* Kill the processes */
1234
1294
ret = kill(p->pid, SIGTERM);
1235
1295
if(ret == -1 and errno != ESRCH){
1236
1296
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1297
error(0, errno, "kill");
1238
1298
}
1239
1299
}
1240
1300
}
1244
1304
ret = wait(NULL);
1245
1305
} while(ret >= 0);
1246
1306
if(errno != ECHILD){
1247
perror("wait");
1307
error(0, errno, "wait");
1248
1308
}
1249
1309
1250
1310
free_plugin_list();
1251
1311
1252
1312
free(plugindir);
1313
free(pluginhelperdir);
1253
1314
free(argfile);
1254
1315
1255
1316
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0