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- Committer: Björn Påhlsson
- Date: 2010-08-22 18:35:37 UTC
- mto: (24.1.154 mandos) (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@fukt.bsnet.se-20100822183537-6trr1puyjvk14ejg
* mandos: Added ClientDBus.approve_pending property. Exposed
approved_by_default, approved_delay, approved_duration as
D-Bus properties.
approved_by_default, approved_delay, approved_duration as
D-Bus properties.
- 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 © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 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
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
29
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(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
68
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
74
73
75
74
#define BUFFER_SIZE 256
76
75
77
76
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
78
81
79
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
81
84
82
typedef struct plugin{
85
83
char *name; /* can be NULL or any plugin name */
105
103
106
104
/* Gets an existing plugin based on name,
107
105
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
106
static plugin *getplugin(char *name){
110
107
/* Check for existing plugin with that name */
111
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
172
169
}
173
170
174
171
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
172
static bool add_to_char_array(const char *new, char ***array,
177
173
int *len){
178
174
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
175
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
184
179
/* Malloc check */
185
if(new_array == NULL){
180
if(*array == NULL){
186
181
return false;
187
182
}
188
*array = new_array;
189
183
/* Make a copy of the new string */
190
184
char *copy;
191
185
do {
203
197
}
204
198
205
199
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
200
static bool add_argument(plugin *p, const char *arg){
208
201
if(p == NULL){
209
202
return false;
212
205
}
213
206
214
207
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
208
static bool add_environment(plugin *p, const char *def, bool replace){
217
209
if(p == NULL){
218
210
return false;
220
212
/* namelen = length of name of environment variable */
221
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
214
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
225
217
/* It already exists */
226
218
if(replace){
227
char *new_envdef;
219
char *new;
228
220
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
232
224
return false;
233
225
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
226
*e = new;
227
strcpy(*e, def);
236
228
}
237
229
return true;
238
230
}
240
232
return add_to_char_array(def, &(p->environ), &(p->envc));
241
233
}
242
234
243
#ifndef O_CLOEXEC
244
235
/*
245
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
237
* Descriptor Flags".
247
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
248
239
*/
249
__attribute__((warn_unused_result))
250
240
static int set_cloexec_flag(int fd){
251
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
242
/* If reading the flags failed, return error indication now. */
257
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
248
ret | FD_CLOEXEC));
259
249
}
260
#endif /* not O_CLOEXEC */
261
250
262
251
263
252
/* Mark processes as completed when they exit, and save their exit
277
266
/* No child processes */
278
267
break;
279
268
}
280
error(0, errno, "waitpid");
269
perror("waitpid");
281
270
}
282
271
283
272
/* A child exited, find it in process_list */
295
284
}
296
285
297
286
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
287
static bool print_out_password(const char *buffer, size_t length){
300
288
ssize_t ret;
301
289
for(size_t written = 0; written < length; written += (size_t)ret){
309
297
}
310
298
311
299
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
300
static void free_plugin(plugin *plugin_node){
314
301
315
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
347
334
348
335
int main(int argc, char *argv[]){
349
336
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
337
char *argfile = NULL;
352
338
FILE *conffp;
353
struct dirent **direntries = NULL;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
354
342
struct stat st;
355
343
fd_set rfds_all;
356
344
int ret, maxfd = 0;
364
352
.sa_flags = SA_NOCLDSTOP };
365
353
char **custom_argv = NULL;
366
354
int custom_argc = 0;
367
int dir_fd = -1;
368
355
369
356
/* Establish a signal handler */
370
357
sigemptyset(&sigchld_action.sa_mask);
371
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
359
if(ret == -1){
373
error(0, errno, "sigaddset");
360
perror("sigaddset");
374
361
exitstatus = EX_OSERR;
375
362
goto fallback;
376
363
}
377
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
365
if(ret == -1){
379
error(0, errno, "sigaction");
366
perror("sigaction");
380
367
exitstatus = EX_OSERR;
381
368
goto fallback;
382
369
}
415
402
.doc = "Group ID the plugins will run as", .group = 3 },
416
403
{ .name = "debug", .key = 132,
417
404
.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
405
/*
423
406
* These reproduce what we would get without ARGP_NO_HELP
424
407
*/
431
414
{ .name = NULL }
432
415
};
433
416
434
__attribute__((nonnull(3)))
435
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
418
errno = 0;
437
419
switch(key){
438
420
char *tmp;
439
intmax_t tmp_id;
421
intmax_t tmpmax;
440
422
case 'g': /* --global-options */
441
423
{
442
424
char *plugin_option;
445
427
break;
446
428
}
447
429
}
448
errno = 0;
449
430
}
450
431
break;
451
432
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
454
}
433
add_environment(getplugin(NULL), arg, true);
455
434
break;
456
435
case 'o': /* --options-for */
457
436
{
474
453
break;
475
454
}
476
455
}
477
errno = 0;
478
456
}
479
457
break;
480
458
case 'E': /* --env-for */
492
470
errno = EINVAL;
493
471
break;
494
472
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
497
}
473
add_environment(getplugin(arg), envdef, true);
498
474
}
499
475
break;
500
476
case 'd': /* --disable */
502
478
plugin *p = getplugin(arg);
503
479
if(p != NULL){
504
480
p->disabled = true;
505
errno = 0;
506
481
}
507
482
}
508
483
break;
511
486
plugin *p = getplugin(arg);
512
487
if(p != NULL){
513
488
p->disabled = false;
514
errno = 0;
515
489
}
516
490
}
517
491
break;
518
492
case 128: /* --plugin-dir */
519
493
free(plugindir);
520
494
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
524
495
break;
525
496
case 129: /* --config-file */
526
497
/* This is already done by parse_opt_config_file() */
527
498
break;
528
499
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
530
501
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
502
or tmpmax != (uid_t)tmpmax){
532
503
argp_error(state, "Bad user ID number: \"%s\", using %"
533
504
PRIdMAX, arg, (intmax_t)uid);
534
505
break;
535
506
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
507
uid = (uid_t)tmpmax;
538
508
break;
539
509
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
541
511
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
512
or tmpmax != (gid_t)tmpmax){
543
513
argp_error(state, "Bad group ID number: \"%s\", using %"
544
514
PRIdMAX, arg, (intmax_t)gid);
545
515
break;
546
516
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
517
gid = (gid_t)tmpmax;
549
518
break;
550
519
case 132: /* --debug */
551
520
debug = true;
552
521
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
522
/*
561
523
* These reproduce what we would get without ARGP_NO_HELP
562
524
*/
606
568
case 129: /* --config-file */
607
569
free(argfile);
608
570
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
611
}
612
571
break;
613
572
case 130: /* --userid */
614
573
case 131: /* --groupid */
615
574
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
575
case '?': /* --help */
618
576
case -3: /* --usage */
619
577
case 'V': /* --version */
641
599
case ENOMEM:
642
600
default:
643
601
errno = ret;
644
error(0, errno, "argp_parse");
602
perror("argp_parse");
645
603
exitstatus = EX_OSERR;
646
604
goto fallback;
647
605
case EINVAL:
668
626
custom_argc = 1;
669
627
custom_argv = malloc(sizeof(char*) * 2);
670
628
if(custom_argv == NULL){
671
error(0, errno, "malloc");
629
perror("malloc");
672
630
exitstatus = EX_OSERR;
673
631
goto fallback;
674
632
}
691
649
}
692
650
new_arg = strdup(p);
693
651
if(new_arg == NULL){
694
error(0, errno, "strdup");
652
perror("strdup");
695
653
exitstatus = EX_OSERR;
696
654
free(org_line);
697
655
goto fallback;
698
656
}
699
657
700
658
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
}
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;
713
666
}
714
667
custom_argv[custom_argc-1] = new_arg;
715
668
custom_argv[custom_argc] = NULL;
719
672
ret = fclose(conffp);
720
673
} while(ret == EOF and errno == EINTR);
721
674
if(ret == EOF){
722
error(0, errno, "fclose");
675
perror("fclose");
723
676
exitstatus = EX_IOERR;
724
677
goto fallback;
725
678
}
728
681
/* Check for harmful errors and go to fallback. Other errors might
729
682
not affect opening plugins */
730
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
684
perror("fopen");
732
685
exitstatus = EX_OSERR;
733
686
goto fallback;
734
687
}
745
698
case ENOMEM:
746
699
default:
747
700
errno = ret;
748
error(0, errno, "argp_parse");
701
perror("argp_parse");
749
702
exitstatus = EX_OSERR;
750
703
goto fallback;
751
704
case EINVAL:
765
718
case ENOMEM:
766
719
default:
767
720
errno = ret;
768
error(0, errno, "argp_parse");
721
perror("argp_parse");
769
722
exitstatus = EX_OSERR;
770
723
goto fallback;
771
724
case EINVAL:
773
726
goto fallback;
774
727
}
775
728
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
729
if(debug){
795
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
796
731
fprintf(stderr, "Plugin: %s has %d arguments\n",
805
740
}
806
741
}
807
742
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<http://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);
743
/* Strip permissions down to nobody */
744
setgid(gid);
834
745
if(ret == -1){
835
error(0, errno, "setgid");
746
perror("setgid");
836
747
}
837
748
ret = setuid(uid);
838
749
if(ret == -1){
839
error(0, errno, "setuid");
750
perror("setuid");
840
751
}
841
752
842
753
/* Open plugin directory with close_on_exec flag */
843
754
{
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
);
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
}
851
773
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
774
perror("Could not open plugin dir");
853
775
exitstatus = EX_UNAVAILABLE;
854
776
goto fallback;
855
777
}
858
780
/* Set the FD_CLOEXEC flag on the directory */
859
781
ret = set_cloexec_flag(dir_fd);
860
782
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
862
785
exitstatus = EX_OSERR;
863
786
goto fallback;
864
787
}
865
788
#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
}
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;
889
796
}
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
797
}
901
798
902
799
FD_ZERO(&rfds_all);
903
800
904
801
/* 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]);
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");
911
874
continue;
912
875
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
914
878
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
879
perror("stat");
880
free(filename);
918
881
continue;
919
882
}
920
883
921
884
/* Ignore non-executable files */
922
885
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
887
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);
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
930
890
}
931
close(plugin_fd);
932
free(direntries[i]);
891
free(filename);
933
892
continue;
934
893
}
935
894
936
plugin *p = getplugin(direntries[i]->d_name);
895
plugin *p = getplugin(dirst->d_name);
937
896
if(p == NULL){
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
897
perror("getplugin");
898
free(filename);
941
899
continue;
942
900
}
943
901
if(p->disabled){
944
902
if(debug){
945
903
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
904
dirst->d_name);
947
905
}
948
close(plugin_fd);
949
free(direntries[i]);
906
free(filename);
950
907
continue;
951
908
}
952
909
{
955
912
if(g != NULL){
956
913
for(char **a = g->argv + 1; *a != NULL; a++){
957
914
if(not add_argument(p, *a)){
958
error(0, errno, "add_argument");
915
perror("add_argument");
959
916
}
960
917
}
961
918
/* Add global environment variables */
962
919
for(char **e = g->environ; *e != NULL; e++){
963
920
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
921
perror("add_environment");
965
922
}
966
923
}
967
924
}
968
925
}
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
928
process, too. */
971
929
if(p->environ[0] != NULL){
972
930
for(char **e = environ; *e != NULL; e++){
973
931
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
932
perror("add_environment");
975
933
}
976
934
}
977
935
}
978
936
979
937
int pipefd[2];
980
#ifndef O_CLOEXEC
981
938
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
939
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
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
1001
944
/* Ask OS to automatic close the pipe on exec */
1002
945
ret = set_cloexec_flag(pipefd[0]);
1003
946
if(ret < 0){
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
947
perror("set_cloexec_flag");
1007
948
exitstatus = EX_OSERR;
1008
free(direntries[i]);
1009
949
goto fallback;
1010
950
}
1011
951
ret = set_cloexec_flag(pipefd[1]);
1012
952
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
953
perror("set_cloexec_flag");
1016
954
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1018
955
goto fallback;
1019
956
}
1020
#endif /* not O_CLOEXEC */
1021
957
/* Block SIGCHLD until process is safely in process list */
1022
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
959
&sigchld_action.sa_mask,
1024
960
NULL));
1025
961
if(ret < 0){
1026
error(0, errno, "sigprocmask");
962
perror("sigprocmask");
1027
963
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
964
goto fallback;
1030
965
}
1031
966
/* Starting a new process to be watched */
1034
969
pid = fork();
1035
970
} while(pid == -1 and errno == EINTR);
1036
971
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]);
972
perror("fork");
1042
973
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
974
goto fallback;
1045
975
}
1046
976
if(pid == 0){
1047
977
/* this is the child process */
1048
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1049
979
if(ret < 0){
1050
error(0, errno, "sigaction");
980
perror("sigaction");
1051
981
_exit(EX_OSERR);
1052
982
}
1053
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
984
if(ret < 0){
1055
error(0, errno, "sigprocmask");
985
perror("sigprocmask");
1056
986
_exit(EX_OSERR);
1057
987
}
1058
988
1059
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1060
990
if(ret == -1){
1061
error(0, errno, "dup2");
991
perror("dup2");
1062
992
_exit(EX_OSERR);
1063
993
}
1064
994
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);
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
}
1071
1010
}
1072
1011
/* no return */
1073
1012
}
1074
1013
/* 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);
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);
1078
1018
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1019
perror("getplugin");
1080
1020
ret = (int)(TEMP_FAILURE_RETRY
1081
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
1022
NULL)));
1083
1023
if(ret < 0){
1084
error(0, errno, "sigprocmask");
1024
perror("sigprocmask");
1085
1025
}
1086
1026
exitstatus = EX_OSERR;
1087
free(direntries[i]);
1088
1027
goto fallback;
1089
1028
}
1090
free(direntries[i]);
1091
1029
1092
1030
new_plugin->pid = pid;
1093
1031
new_plugin->fd = pipefd[0];
1098
1036
&sigchld_action.sa_mask,
1099
1037
NULL));
1100
1038
if(ret < 0){
1101
error(0, errno, "sigprocmask");
1039
perror("sigprocmask");
1102
1040
exitstatus = EX_OSERR;
1103
1041
goto fallback;
1104
1042
}
1105
1043
1106
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1107
1046
1108
1047
if(maxfd < new_plugin->fd){
1109
1048
maxfd = new_plugin->fd;
1110
1049
}
1111
1050
}
1112
1051
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1117
1054
free_plugin(getplugin(NULL));
1118
1055
1119
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1132
1069
fd_set rfds = rfds_all;
1133
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1134
1071
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1072
perror("select");
1136
1073
exitstatus = EX_OSERR;
1137
1074
goto fallback;
1138
1075
}
1158
1095
(intmax_t) (proc->pid),
1159
1096
WTERMSIG(proc->status),
1160
1097
strsignal(WTERMSIG(proc->status)));
1098
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
1161
1101
}
1162
1102
}
1163
1103
1164
1104
/* Remove the plugin */
1165
FD_CLR(proc->fd, &rfds_all);
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1166
1107
1167
1108
/* Block signal while modifying process_list */
1168
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1170
1111
&sigchld_action.sa_mask,
1171
1112
NULL));
1172
1113
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1114
perror("sigprocmask");
1174
1115
exitstatus = EX_OSERR;
1175
1116
goto fallback;
1176
1117
}
1184
1125
(sigprocmask(SIG_UNBLOCK,
1185
1126
&sigchld_action.sa_mask, NULL)));
1186
1127
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1128
perror("sigprocmask");
1188
1129
exitstatus = EX_OSERR;
1189
1130
goto fallback;
1190
1131
}
1201
1142
bool bret = print_out_password(proc->buffer,
1202
1143
proc->buffer_length);
1203
1144
if(not bret){
1204
error(0, errno, "print_out_password");
1145
perror("print_out_password");
1205
1146
exitstatus = EX_IOERR;
1206
1147
}
1207
1148
goto fallback;
1208
1149
}
1209
1150
1210
1151
/* This process has not completed. Does it have any output? */
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1212
1155
/* This process had nothing to say at this time */
1213
1156
proc = proc->next;
1214
1157
continue;
1215
1158
}
1216
1159
/* Before reading, make the process' data buffer large enough */
1217
1160
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");
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
1222
1165
exitstatus = EX_OSERR;
1223
1166
goto fallback;
1224
1167
}
1225
proc->buffer = new_buffer;
1226
1168
proc->buffer_size += BUFFER_SIZE;
1227
1169
}
1228
1170
/* Read from the process */
1262
1204
}
1263
1205
bret = print_out_password(passwordbuffer, len);
1264
1206
if(not bret){
1265
error(0, errno, "print_out_password");
1207
perror("print_out_password");
1266
1208
exitstatus = EX_IOERR;
1267
1209
}
1268
1210
}
1270
1212
/* Restore old signal handler */
1271
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1272
1214
if(ret == -1){
1273
error(0, errno, "sigaction");
1215
perror("sigaction");
1274
1216
exitstatus = EX_OSERR;
1275
1217
}
1276
1218
1281
1223
free(custom_argv);
1282
1224
}
1283
1225
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1226
if(dir != NULL){
1227
closedir(dir);
1288
1228
}
1289
1229
1290
1230
/* Kill the processes */
1294
1234
ret = kill(p->pid, SIGTERM);
1295
1235
if(ret == -1 and errno != ESRCH){
1296
1236
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1237
perror("kill");
1298
1238
}
1299
1239
}
1300
1240
}
1304
1244
ret = wait(NULL);
1305
1245
} while(ret >= 0);
1306
1246
if(errno != ECHILD){
1307
error(0, errno, "wait");
1247
perror("wait");
1308
1248
}
1309
1249
1310
1250
free_plugin_list();
1311
1251
1312
1252
free(plugindir);
1313
free(pluginhelperdir);
1314
1253
free(argfile);
1315
1254
1316
1255
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0