To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 395
- compare with another revision
- download diff
- download tarball
- view history from revision 395
- Committer: Teddy Hogeborn
- Date: 2009-10-26 21:16:16 UTC
- Revision ID: teddy@fukt.bsnet.se-20091026211616-38e9wynf4428ip2l
Merge from release branch.
- 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 © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
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() */
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() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
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
*/
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() */
51
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
66
68
*/
67
69
#include <errno.h> /* errno, EBADF */
68
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
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() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
74
72
75
73
#define BUFFER_SIZE 256
76
74
77
75
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
76
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
77
81
78
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
80
84
81
typedef struct plugin{
85
82
char *name; /* can be NULL or any plugin name */
105
102
106
103
/* Gets an existing plugin based on name,
107
104
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
105
static plugin *getplugin(char *name){
110
106
/* Check for existing plugin with that name */
111
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
172
168
}
173
169
174
170
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
171
static bool add_to_char_array(const char *new, char ***array,
177
172
int *len){
178
173
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
174
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
184
178
/* Malloc check */
185
if(new_array == NULL){
179
if(*array == NULL){
186
180
return false;
187
181
}
188
*array = new_array;
189
182
/* Make a copy of the new string */
190
183
char *copy;
191
184
do {
203
196
}
204
197
205
198
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
199
static bool add_argument(plugin *p, const char *arg){
208
200
if(p == NULL){
209
201
return false;
212
204
}
213
205
214
206
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
207
static bool add_environment(plugin *p, const char *def, bool replace){
217
208
if(p == NULL){
218
209
return false;
220
211
/* namelen = length of name of environment variable */
221
212
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
213
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
225
216
/* It already exists */
226
217
if(replace){
227
char *new_envdef;
218
char *new;
228
219
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
222
if(new == NULL){
232
223
return false;
233
224
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
225
*e = new;
226
strcpy(*e, def);
236
227
}
237
228
return true;
238
229
}
240
231
return add_to_char_array(def, &(p->environ), &(p->envc));
241
232
}
242
233
243
#ifndef O_CLOEXEC
244
234
/*
245
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
236
* Descriptor Flags".
247
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
248
238
*/
249
__attribute__((warn_unused_result))
250
239
static int set_cloexec_flag(int fd){
251
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
241
/* If reading the flags failed, return error indication now. */
257
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
247
ret | FD_CLOEXEC));
259
248
}
260
#endif /* not O_CLOEXEC */
261
249
262
250
263
251
/* Mark processes as completed when they exit, and save their exit
277
265
/* No child processes */
278
266
break;
279
267
}
280
error(0, errno, "waitpid");
268
perror("waitpid");
281
269
}
282
270
283
271
/* A child exited, find it in process_list */
295
283
}
296
284
297
285
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
286
static bool print_out_password(const char *buffer, size_t length){
300
287
ssize_t ret;
301
288
for(size_t written = 0; written < length; written += (size_t)ret){
309
296
}
310
297
311
298
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
299
static void free_plugin(plugin *plugin_node){
314
300
315
301
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
347
333
348
334
int main(int argc, char *argv[]){
349
335
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
336
char *argfile = NULL;
352
337
FILE *conffp;
353
struct dirent **direntries = NULL;
338
size_t d_name_len;
339
DIR *dir = NULL;
340
struct dirent *dirst;
354
341
struct stat st;
355
342
fd_set rfds_all;
356
343
int ret, maxfd = 0;
364
351
.sa_flags = SA_NOCLDSTOP };
365
352
char **custom_argv = NULL;
366
353
int custom_argc = 0;
367
int dir_fd = -1;
368
354
369
355
/* Establish a signal handler */
370
356
sigemptyset(&sigchld_action.sa_mask);
371
357
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
358
if(ret == -1){
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
375
361
goto fallback;
376
362
}
377
363
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
364
if(ret == -1){
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
381
367
goto fallback;
382
368
}
383
369
415
401
.doc = "Group ID the plugins will run as", .group = 3 },
416
402
{ .name = "debug", .key = 132,
417
403
.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 },
422
404
/*
423
405
* These reproduce what we would get without ARGP_NO_HELP
424
406
*/
431
413
{ .name = NULL }
432
414
};
433
415
434
__attribute__((nonnull(3)))
435
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
417
errno = 0;
437
418
switch(key){
438
419
char *tmp;
439
intmax_t tmp_id;
420
intmax_t tmpmax;
440
421
case 'g': /* --global-options */
441
422
{
442
423
char *plugin_option;
445
426
break;
446
427
}
447
428
}
448
errno = 0;
449
429
}
450
430
break;
451
431
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
454
}
432
add_environment(getplugin(NULL), arg, true);
455
433
break;
456
434
case 'o': /* --options-for */
457
435
{
474
452
break;
475
453
}
476
454
}
477
errno = 0;
478
455
}
479
456
break;
480
457
case 'E': /* --env-for */
492
469
errno = EINVAL;
493
470
break;
494
471
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
497
}
472
add_environment(getplugin(arg), envdef, true);
498
473
}
499
474
break;
500
475
case 'd': /* --disable */
502
477
plugin *p = getplugin(arg);
503
478
if(p != NULL){
504
479
p->disabled = true;
505
errno = 0;
506
480
}
507
481
}
508
482
break;
511
485
plugin *p = getplugin(arg);
512
486
if(p != NULL){
513
487
p->disabled = false;
514
errno = 0;
515
488
}
516
489
}
517
490
break;
518
491
case 128: /* --plugin-dir */
519
492
free(plugindir);
520
493
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
524
494
break;
525
495
case 129: /* --config-file */
526
496
/* This is already done by parse_opt_config_file() */
527
497
break;
528
498
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
499
tmpmax = strtoimax(arg, &tmp, 10);
530
500
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
501
or tmpmax != (uid_t)tmpmax){
532
502
argp_error(state, "Bad user ID number: \"%s\", using %"
533
503
PRIdMAX, arg, (intmax_t)uid);
534
504
break;
535
505
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
506
uid = (uid_t)tmpmax;
538
507
break;
539
508
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
509
tmpmax = strtoimax(arg, &tmp, 10);
541
510
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
511
or tmpmax != (gid_t)tmpmax){
543
512
argp_error(state, "Bad group ID number: \"%s\", using %"
544
513
PRIdMAX, arg, (intmax_t)gid);
545
514
break;
546
515
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
516
gid = (gid_t)tmpmax;
549
517
break;
550
518
case 132: /* --debug */
551
519
debug = true;
552
520
break;
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
560
521
/*
561
522
* These reproduce what we would get without ARGP_NO_HELP
562
523
*/
606
567
case 129: /* --config-file */
607
568
free(argfile);
608
569
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
611
}
612
570
break;
613
571
case 130: /* --userid */
614
572
case 131: /* --groupid */
615
573
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
574
case '?': /* --help */
618
575
case -3: /* --usage */
619
576
case 'V': /* --version */
641
598
case ENOMEM:
642
599
default:
643
600
errno = ret;
644
error(0, errno, "argp_parse");
601
perror("argp_parse");
645
602
exitstatus = EX_OSERR;
646
603
goto fallback;
647
604
case EINVAL:
668
625
custom_argc = 1;
669
626
custom_argv = malloc(sizeof(char*) * 2);
670
627
if(custom_argv == NULL){
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
673
630
goto fallback;
674
631
}
675
632
custom_argv[0] = argv[0];
691
648
}
692
649
new_arg = strdup(p);
693
650
if(new_arg == NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
696
653
free(org_line);
697
654
goto fallback;
698
655
}
699
656
700
657
custom_argc += 1;
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
}
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;
713
665
}
714
666
custom_argv[custom_argc-1] = new_arg;
715
667
custom_argv[custom_argc] = NULL;
719
671
ret = fclose(conffp);
720
672
} while(ret == EOF and errno == EINTR);
721
673
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
724
676
goto fallback;
725
677
}
726
678
free(org_line);
728
680
/* Check for harmful errors and go to fallback. Other errors might
729
681
not affect opening plugins */
730
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
733
685
goto fallback;
734
686
}
735
687
}
745
697
case ENOMEM:
746
698
default:
747
699
errno = ret;
748
error(0, errno, "argp_parse");
700
perror("argp_parse");
749
701
exitstatus = EX_OSERR;
750
702
goto fallback;
751
703
case EINVAL:
765
717
case ENOMEM:
766
718
default:
767
719
errno = ret;
768
error(0, errno, "argp_parse");
720
perror("argp_parse");
769
721
exitstatus = EX_OSERR;
770
722
goto fallback;
771
723
case EINVAL:
773
725
goto fallback;
774
726
}
775
727
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
794
728
if(debug){
795
for(plugin *p = plugin_list; p != NULL; p = p->next){
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
796
730
fprintf(stderr, "Plugin: %s has %d arguments\n",
797
731
p->name ? p->name : "Global", p->argc - 1);
798
732
for(char **a = p->argv; *a != NULL; a++){
805
739
}
806
740
}
807
741
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);
742
/* Strip permissions down to nobody */
743
setgid(gid);
834
744
if(ret == -1){
835
error(0, errno, "setgid");
745
perror("setgid");
836
746
}
837
747
ret = setuid(uid);
838
748
if(ret == -1){
839
error(0, errno, "setuid");
749
perror("setuid");
840
750
}
841
751
842
752
/* Open plugin directory with close_on_exec flag */
843
753
{
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
);
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
}
851
772
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
854
775
goto fallback;
855
776
}
856
777
858
779
/* Set the FD_CLOEXEC flag on the directory */
859
780
ret = set_cloexec_flag(dir_fd);
860
781
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
863
785
goto fallback;
864
786
}
865
787
#endif /* O_CLOEXEC */
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
}
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;
889
795
}
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;
900
796
}
901
797
902
798
FD_ZERO(&rfds_all);
903
799
904
800
/* Read and execute any executable in the plugin directory*/
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]);
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");
911
873
continue;
912
874
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
875
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
914
877
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
878
perror("stat");
879
free(filename);
918
880
continue;
919
881
}
920
882
921
883
/* Ignore non-executable files */
922
884
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
886
if(debug){
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);
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
" with bad type or mode\n", filename);
930
889
}
931
close(plugin_fd);
932
free(direntries[i]);
890
free(filename);
933
891
continue;
934
892
}
935
893
936
plugin *p = getplugin(direntries[i]->d_name);
894
plugin *p = getplugin(dirst->d_name);
937
895
if(p == NULL){
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
896
perror("getplugin");
897
free(filename);
941
898
continue;
942
899
}
943
900
if(p->disabled){
944
901
if(debug){
945
902
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
903
dirst->d_name);
947
904
}
948
close(plugin_fd);
949
free(direntries[i]);
905
free(filename);
950
906
continue;
951
907
}
952
908
{
955
911
if(g != NULL){
956
912
for(char **a = g->argv + 1; *a != NULL; a++){
957
913
if(not add_argument(p, *a)){
958
error(0, errno, "add_argument");
914
perror("add_argument");
959
915
}
960
916
}
961
917
/* Add global environment variables */
962
918
for(char **e = g->environ; *e != NULL; e++){
963
919
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
920
perror("add_environment");
965
921
}
966
922
}
967
923
}
968
924
}
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
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. */
971
928
if(p->environ[0] != NULL){
972
929
for(char **e = environ; *e != NULL; e++){
973
930
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
931
perror("add_environment");
975
932
}
976
933
}
977
934
}
978
935
979
936
int pipefd[2];
980
#ifndef O_CLOEXEC
981
937
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 */
985
938
if(ret == -1){
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
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
941
goto fallback;
942
}
1001
943
/* Ask OS to automatic close the pipe on exec */
1002
944
ret = set_cloexec_flag(pipefd[0]);
1003
945
if(ret < 0){
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
1009
948
goto fallback;
1010
949
}
1011
950
ret = set_cloexec_flag(pipefd[1]);
1012
951
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
1018
954
goto fallback;
1019
955
}
1020
#endif /* not O_CLOEXEC */
1021
956
/* Block SIGCHLD until process is safely in process list */
1022
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
958
&sigchld_action.sa_mask,
1024
959
NULL));
1025
960
if(ret < 0){
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1029
963
goto fallback;
1030
964
}
1031
965
/* Starting a new process to be watched */
1034
968
pid = fork();
1035
969
} while(pid == -1 and errno == EINTR);
1036
970
if(pid == -1){
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]);
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
1044
973
goto fallback;
1045
974
}
1046
975
if(pid == 0){
1047
976
/* this is the child process */
1048
977
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1049
978
if(ret < 0){
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1052
981
}
1053
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
983
if(ret < 0){
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1057
986
}
1058
987
1059
988
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1060
989
if(ret == -1){
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1063
992
}
1064
993
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);
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
}
1071
1009
}
1072
1010
/* no return */
1073
1011
}
1074
1012
/* Parent process */
1075
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
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);
1078
1017
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1018
perror("getplugin");
1080
1019
ret = (int)(TEMP_FAILURE_RETRY
1081
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
1021
NULL)));
1083
1022
if(ret < 0){
1084
error(0, errno, "sigprocmask");
1023
perror("sigprocmask");
1085
1024
}
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
1025
exitstatus = EXIT_FAILURE;
1088
1026
goto fallback;
1089
1027
}
1090
free(direntries[i]);
1091
1028
1092
1029
new_plugin->pid = pid;
1093
1030
new_plugin->fd = pipefd[0];
1098
1035
&sigchld_action.sa_mask,
1099
1036
NULL));
1100
1037
if(ret < 0){
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1103
1040
goto fallback;
1104
1041
}
1105
1042
1106
FD_SET(new_plugin->fd, &rfds_all);
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
1107
1045
1108
1046
if(maxfd < new_plugin->fd){
1109
1047
maxfd = new_plugin->fd;
1110
1048
}
1111
1049
}
1112
1050
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1051
TEMP_FAILURE_RETRY(closedir(dir));
1052
dir = NULL;
1117
1053
free_plugin(getplugin(NULL));
1118
1054
1119
1055
for(plugin *p = plugin_list; p != NULL; p = p->next){
1132
1068
fd_set rfds = rfds_all;
1133
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1134
1070
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1137
1073
goto fallback;
1138
1074
}
1139
1075
/* OK, now either a process completed, or something can be read
1158
1094
(intmax_t) (proc->pid),
1159
1095
WTERMSIG(proc->status),
1160
1096
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));
1161
1100
}
1162
1101
}
1163
1102
1164
1103
/* Remove the plugin */
1165
FD_CLR(proc->fd, &rfds_all);
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1166
1106
1167
1107
/* Block signal while modifying process_list */
1168
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1170
1110
&sigchld_action.sa_mask,
1171
1111
NULL));
1172
1112
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1175
1115
goto fallback;
1176
1116
}
1177
1117
1184
1124
(sigprocmask(SIG_UNBLOCK,
1185
1125
&sigchld_action.sa_mask, NULL)));
1186
1126
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1189
1129
goto fallback;
1190
1130
}
1191
1131
1201
1141
bool bret = print_out_password(proc->buffer,
1202
1142
proc->buffer_length);
1203
1143
if(not bret){
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1206
1146
}
1207
1147
goto fallback;
1208
1148
}
1209
1149
1210
1150
/* This process has not completed. Does it have any output? */
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1212
1154
/* This process had nothing to say at this time */
1213
1155
proc = proc->next;
1214
1156
continue;
1215
1157
}
1216
1158
/* Before reading, make the process' data buffer large enough */
1217
1159
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
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;
1223
1165
goto fallback;
1224
1166
}
1225
proc->buffer = new_buffer;
1226
1167
proc->buffer_size += BUFFER_SIZE;
1227
1168
}
1228
1169
/* Read from the process */
1247
1188
1248
1189
fallback:
1249
1190
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1252
1192
/* Fallback if all plugins failed, none are found or an error
1253
1193
occured */
1254
1194
bool bret;
1262
1202
}
1263
1203
bret = print_out_password(passwordbuffer, len);
1264
1204
if(not bret){
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1267
1207
}
1268
1208
}
1269
1209
1270
1210
/* Restore old signal handler */
1271
1211
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1272
1212
if(ret == -1){
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1275
1215
}
1276
1216
1277
1217
if(custom_argv != NULL){
1281
1221
free(custom_argv);
1282
1222
}
1283
1223
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1224
if(dir != NULL){
1225
closedir(dir);
1288
1226
}
1289
1227
1290
1228
/* Kill the processes */
1294
1232
ret = kill(p->pid, SIGTERM);
1295
1233
if(ret == -1 and errno != ESRCH){
1296
1234
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1235
perror("kill");
1298
1236
}
1299
1237
}
1300
1238
}
1304
1242
ret = wait(NULL);
1305
1243
} while(ret >= 0);
1306
1244
if(errno != ECHILD){
1307
error(0, errno, "wait");
1245
perror("wait");
1308
1246
}
1309
1247
1310
1248
free_plugin_list();
1311
1249
1312
1250
free(plugindir);
1313
free(pluginhelperdir);
1314
1251
free(argfile);
1315
1252
1316
1253
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0