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- Committer: Teddy Hogeborn
- Date: 2019-04-09 19:41:53 UTC
- mfrom: (237.7.647 trunk)
- Revision ID: teddy@recompile.se-20190409194153-khftfvj3ee27md1a
Merge from trunk
- files added:
- bugs.xml
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
17
19
*
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
22
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
24
25
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
O_CLOEXEC, pipe2() */
27
28
#include <stddef.h> /* size_t, NULL */
28
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
30
realloc() */
30
31
#include <stdbool.h> /* bool, true, false */
31
32
#include <stdio.h> /* 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() */
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
43
#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() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
58
57
#include <errno.h> /* errno */
59
58
#include <argp.h> /* struct argp_option, struct
60
59
argp_state, struct argp,
72
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
72
#include <errno.h> /* errno */
74
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
75
76
76
#define BUFFER_SIZE 256
77
77
78
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
79
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
81
82
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
84
84
85
typedef struct plugin{
85
86
char *name; /* can be NULL or any plugin name */
105
106
106
107
/* Gets an existing plugin based on name,
107
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
108
110
static plugin *getplugin(char *name){
109
111
/* Check for existing plugin with that name */
110
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
171
173
}
172
174
173
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
174
177
static bool add_to_char_array(const char *new, char ***array,
175
178
int *len){
176
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
177
181
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
181
185
/* Malloc check */
182
if(*array == NULL){
186
if(new_array == NULL){
183
187
return false;
184
188
}
189
*array = new_array;
185
190
/* Make a copy of the new string */
186
191
char *copy;
187
192
do {
199
204
}
200
205
201
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
202
208
static bool add_argument(plugin *p, const char *arg){
203
209
if(p == NULL){
204
210
return false;
207
213
}
208
214
209
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
210
217
static bool add_environment(plugin *p, const char *def, bool replace){
211
218
if(p == NULL){
212
219
return false;
214
221
/* namelen = length of name of environment variable */
215
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
223
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
219
226
/* It already exists */
220
227
if(replace){
221
char *new;
228
char *new_envdef;
222
229
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
226
233
return false;
227
234
}
228
*e = new;
229
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
230
237
}
231
238
return true;
232
239
}
234
241
return add_to_char_array(def, &(p->environ), &(p->envc));
235
242
}
236
243
244
#ifndef O_CLOEXEC
237
245
/*
238
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
247
* Descriptor Flags".
240
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
241
249
*/
250
__attribute__((warn_unused_result))
242
251
static int set_cloexec_flag(int fd){
243
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
244
253
/* If reading the flags failed, return error indication now. */
249
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
259
ret | FD_CLOEXEC));
251
260
}
261
#endif /* not O_CLOEXEC */
252
262
253
263
254
264
/* Mark processes as completed when they exit, and save their exit
286
296
}
287
297
288
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
289
300
static bool print_out_password(const char *buffer, size_t length){
290
301
ssize_t ret;
291
302
for(size_t written = 0; written < length; written += (size_t)ret){
299
310
}
300
311
301
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
302
314
static void free_plugin(plugin *plugin_node){
303
315
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
305
317
free(*arg);
306
318
}
319
free(plugin_node->name);
307
320
free(plugin_node->argv);
308
321
for(char **env = plugin_node->environ; *env != NULL; env++){
309
322
free(*env);
336
349
337
350
int main(int argc, char *argv[]){
338
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
339
353
char *argfile = NULL;
340
354
FILE *conffp;
341
size_t d_name_len;
342
DIR *dir = NULL;
343
struct dirent *dirst;
355
struct dirent **direntries = NULL;
344
356
struct stat st;
345
357
fd_set rfds_all;
346
358
int ret, maxfd = 0;
354
366
.sa_flags = SA_NOCLDSTOP };
355
367
char **custom_argv = NULL;
356
368
int custom_argc = 0;
369
int dir_fd = -1;
357
370
358
371
/* Establish a signal handler */
359
372
sigemptyset(&sigchld_action.sa_mask);
404
417
.doc = "Group ID the plugins will run as", .group = 3 },
405
418
{ .name = "debug", .key = 132,
406
419
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
407
424
/*
408
425
* These reproduce what we would get without ARGP_NO_HELP
409
426
*/
416
433
{ .name = NULL }
417
434
};
418
435
436
__attribute__((nonnull(3)))
419
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
438
errno = 0;
421
439
switch(key){
422
440
char *tmp;
423
intmax_t tmpmax;
441
intmax_t tmp_id;
424
442
case 'g': /* --global-options */
425
443
{
426
444
char *plugin_option;
429
447
break;
430
448
}
431
449
}
450
errno = 0;
432
451
}
433
452
break;
434
453
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
456
}
436
457
break;
437
458
case 'o': /* --options-for */
438
459
{
455
476
break;
456
477
}
457
478
}
479
errno = 0;
458
480
}
459
481
break;
460
482
case 'E': /* --env-for */
472
494
errno = EINVAL;
473
495
break;
474
496
}
475
add_environment(getplugin(arg), envdef, true);
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
499
}
476
500
}
477
501
break;
478
502
case 'd': /* --disable */
480
504
plugin *p = getplugin(arg);
481
505
if(p != NULL){
482
506
p->disabled = true;
507
errno = 0;
483
508
}
484
509
}
485
510
break;
488
513
plugin *p = getplugin(arg);
489
514
if(p != NULL){
490
515
p->disabled = false;
516
errno = 0;
491
517
}
492
518
}
493
519
break;
494
520
case 128: /* --plugin-dir */
495
521
free(plugindir);
496
522
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
497
526
break;
498
527
case 129: /* --config-file */
499
528
/* This is already done by parse_opt_config_file() */
500
529
break;
501
530
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
531
tmp_id = strtoimax(arg, &tmp, 10);
503
532
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
533
or tmp_id != (uid_t)tmp_id){
505
534
argp_error(state, "Bad user ID number: \"%s\", using %"
506
535
PRIdMAX, arg, (intmax_t)uid);
507
536
break;
508
537
}
509
uid = (uid_t)tmpmax;
538
uid = (uid_t)tmp_id;
539
errno = 0;
510
540
break;
511
541
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
513
543
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
544
or tmp_id != (gid_t)tmp_id){
515
545
argp_error(state, "Bad group ID number: \"%s\", using %"
516
546
PRIdMAX, arg, (intmax_t)gid);
517
547
break;
518
548
}
519
gid = (gid_t)tmpmax;
549
gid = (gid_t)tmp_id;
550
errno = 0;
520
551
break;
521
552
case 132: /* --debug */
522
553
debug = true;
523
554
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
524
562
/*
525
563
* These reproduce what we would get without ARGP_NO_HELP
526
564
*/
527
565
case '?': /* --help */
528
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
530
569
case -3: /* --usage */
531
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
571
argp_state_help(state, state->out_stream,
533
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
534
574
case 'V': /* --version */
535
575
fprintf(state->out_stream, "%s\n", argp_program_version);
536
576
exit(EXIT_SUCCESS);
546
586
if(arg[0] == '\0'){
547
587
break;
548
588
}
589
/* FALLTHROUGH */
549
590
default:
550
591
return ARGP_ERR_UNKNOWN;
551
592
}
570
611
case 129: /* --config-file */
571
612
free(argfile);
572
613
argfile = strdup(arg);
614
if(argfile != NULL){
615
errno = 0;
616
}
573
617
break;
574
618
case 130: /* --userid */
575
619
case 131: /* --groupid */
576
620
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
577
622
case '?': /* --help */
578
623
case -3: /* --usage */
579
624
case 'V': /* --version */
658
703
}
659
704
660
705
custom_argc += 1;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
666
free(org_line);
667
goto fallback;
706
{
707
char **new_argv = realloc(custom_argv, sizeof(char *)
708
* ((size_t)custom_argc + 1));
709
if(new_argv == NULL){
710
error(0, errno, "realloc");
711
exitstatus = EX_OSERR;
712
free(new_arg);
713
free(org_line);
714
goto fallback;
715
} else {
716
custom_argv = new_argv;
717
}
668
718
}
669
719
custom_argv[custom_argc-1] = new_arg;
670
720
custom_argv[custom_argc] = NULL;
728
778
goto fallback;
729
779
}
730
780
781
{
782
char *pluginhelperenv;
783
bool bret = true;
784
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
785
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
786
if(ret != -1){
787
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
788
}
789
if(ret == -1 or not bret){
790
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
791
" environment variable to \"%s\" for all plugins\n",
792
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
793
}
794
if(ret != -1){
795
free(pluginhelperenv);
796
}
797
}
798
731
799
if(debug){
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
733
801
fprintf(stderr, "Plugin: %s has %d arguments\n",
734
802
p->name ? p->name : "Global", p->argc - 1);
735
803
for(char **a = p->argv; *a != NULL; a++){
742
810
}
743
811
}
744
812
745
/* Strip permissions down to nobody */
746
setgid(gid);
813
if(getuid() == 0){
814
/* Work around Debian bug #633582:
815
<https://bugs.debian.org/633582> */
816
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
817
if(plugindir_fd == -1){
818
if(errno != ENOENT){
819
error(0, errno, "open(\"" PDIR "\")");
820
}
821
} else {
822
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
823
if(ret == -1){
824
error(0, errno, "fstat");
825
} else {
826
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
827
ret = fchown(plugindir_fd, uid, gid);
828
if(ret == -1){
829
error(0, errno, "fchown");
830
}
831
}
832
}
833
close(plugindir_fd);
834
}
835
}
836
837
/* Lower permissions */
838
ret = setgid(gid);
747
839
if(ret == -1){
748
840
error(0, errno, "setgid");
749
841
}
754
846
755
847
/* Open plugin directory with close_on_exec flag */
756
848
{
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
849
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
850
#ifdef O_CLOEXEC
851
O_CLOEXEC
852
#else /* not O_CLOEXEC */
853
0
854
#endif /* not O_CLOEXEC */
855
);
775
856
if(dir_fd == -1){
776
857
error(0, errno, "Could not open plugin dir");
777
858
exitstatus = EX_UNAVAILABLE;
783
864
ret = set_cloexec_flag(dir_fd);
784
865
if(ret < 0){
785
866
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
867
exitstatus = EX_OSERR;
788
868
goto fallback;
789
869
}
790
870
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
871
}
872
873
int good_name(const struct dirent * const dirent){
874
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
875
"*.dpkg-old", "*.dpkg-bak",
876
"*.dpkg-divert", NULL };
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pat = (const char **)patterns;
882
*pat != NULL; pat++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
886
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
887
!= FNM_NOMATCH){
888
if(debug){
889
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
890
" matching pattern %s\n", dirent->d_name, *pat);
891
}
892
return 0;
893
}
798
894
}
895
return 1;
896
}
897
898
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
alphasort);
900
if(numplugins == -1){
901
error(0, errno, "Could not scan plugin dir");
902
direntries = NULL;
903
exitstatus = EX_OSERR;
904
goto fallback;
799
905
}
800
906
801
907
FD_ZERO(&rfds_all);
802
908
803
909
/* Read and execute any executable in the plugin directory*/
804
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
808
809
/* All directory entries have been processed */
810
if(dirst == NULL){
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
814
goto fallback;
815
}
816
break;
817
}
818
819
d_name_len = strlen(dirst->d_name);
820
821
/* Ignore dotfiles, backup files and other junk */
822
{
823
bool bad_name = false;
824
825
const char const *bad_prefixes[] = { ".", "#", NULL };
826
827
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
828
".dpkg-old",
829
".dpkg-bak",
830
".dpkg-divert", NULL };
831
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
832
size_t pre_len = strlen(*pre);
833
if((d_name_len >= pre_len)
834
and strncmp((dirst->d_name), *pre, pre_len) == 0){
835
if(debug){
836
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
837
" with bad prefix %s\n", dirst->d_name, *pre);
838
}
839
bad_name = true;
840
break;
841
}
842
}
843
if(bad_name){
844
continue;
845
}
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
size_t suf_len = strlen(*suf);
848
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
850
== 0)){
851
if(debug){
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
853
" with bad suffix %s\n", dirst->d_name, *suf);
854
}
855
bad_name = true;
856
break;
857
}
858
}
859
860
if(bad_name){
861
continue;
862
}
863
}
864
865
char *filename;
866
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
869
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
873
}
874
if(ret < 0){
875
error(0, errno, "asprintf");
910
for(int i = 0; i < numplugins; i++){
911
912
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
913
if(plugin_fd == -1){
914
error(0, errno, "Could not open plugin");
915
free(direntries[i]);
876
916
continue;
877
917
}
878
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
880
919
if(ret == -1){
881
920
error(0, errno, "stat");
882
free(filename);
921
close(plugin_fd);
922
free(direntries[i]);
883
923
continue;
884
924
}
885
925
886
926
/* Ignore non-executable files */
887
927
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
928
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
929
X_OK, 0)) != 0)){
889
930
if(debug){
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
" with bad type or mode\n", filename);
931
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
932
" with bad type or mode\n",
933
plugindir != NULL ? plugindir : PDIR,
934
direntries[i]->d_name);
892
935
}
893
free(filename);
936
close(plugin_fd);
937
free(direntries[i]);
894
938
continue;
895
939
}
896
940
897
plugin *p = getplugin(dirst->d_name);
941
plugin *p = getplugin(direntries[i]->d_name);
898
942
if(p == NULL){
899
943
error(0, errno, "getplugin");
900
free(filename);
944
close(plugin_fd);
945
free(direntries[i]);
901
946
continue;
902
947
}
903
948
if(p->disabled){
904
949
if(debug){
905
950
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
906
dirst->d_name);
951
direntries[i]->d_name);
907
952
}
908
free(filename);
953
close(plugin_fd);
954
free(direntries[i]);
909
955
continue;
910
956
}
911
957
{
925
971
}
926
972
}
927
973
}
928
/* If this plugin has any environment variables, we will call
929
using execve and need to duplicate the environment from this
930
process, too. */
974
/* If this plugin has any environment variables, we need to
975
duplicate the environment from this process, too. */
931
976
if(p->environ[0] != NULL){
932
977
for(char **e = environ; *e != NULL; e++){
933
978
if(not add_environment(p, *e, false)){
937
982
}
938
983
939
984
int pipefd[2];
985
#ifndef O_CLOEXEC
940
986
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
987
#else /* O_CLOEXEC */
988
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
989
#endif /* O_CLOEXEC */
941
990
if(ret == -1){
942
991
error(0, errno, "pipe");
943
992
exitstatus = EX_OSERR;
944
goto fallback;
945
}
993
free(direntries[i]);
994
goto fallback;
995
}
996
if(pipefd[0] >= FD_SETSIZE){
997
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
998
FD_SETSIZE);
999
close(pipefd[0]);
1000
close(pipefd[1]);
1001
exitstatus = EX_OSERR;
1002
free(direntries[i]);
1003
goto fallback;
1004
}
1005
#ifndef O_CLOEXEC
946
1006
/* Ask OS to automatic close the pipe on exec */
947
1007
ret = set_cloexec_flag(pipefd[0]);
948
1008
if(ret < 0){
949
1009
error(0, errno, "set_cloexec_flag");
1010
close(pipefd[0]);
1011
close(pipefd[1]);
950
1012
exitstatus = EX_OSERR;
1013
free(direntries[i]);
951
1014
goto fallback;
952
1015
}
953
1016
ret = set_cloexec_flag(pipefd[1]);
954
1017
if(ret < 0){
955
1018
error(0, errno, "set_cloexec_flag");
1019
close(pipefd[0]);
1020
close(pipefd[1]);
956
1021
exitstatus = EX_OSERR;
1022
free(direntries[i]);
957
1023
goto fallback;
958
1024
}
1025
#endif /* not O_CLOEXEC */
959
1026
/* Block SIGCHLD until process is safely in process list */
960
1027
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
1028
&sigchld_action.sa_mask,
963
1030
if(ret < 0){
964
1031
error(0, errno, "sigprocmask");
965
1032
exitstatus = EX_OSERR;
1033
free(direntries[i]);
966
1034
goto fallback;
967
1035
}
968
1036
/* Starting a new process to be watched */
972
1040
} while(pid == -1 and errno == EINTR);
973
1041
if(pid == -1){
974
1042
error(0, errno, "fork");
1043
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1044
&sigchld_action.sa_mask, NULL));
1045
close(pipefd[0]);
1046
close(pipefd[1]);
975
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
976
1049
goto fallback;
977
1050
}
978
1051
if(pid == 0){
994
1067
_exit(EX_OSERR);
995
1068
}
996
1069
997
if(dirfd(dir) < 0){
998
/* If dir has no file descriptor, we could not set FD_CLOEXEC
999
above and must now close it manually here. */
1000
closedir(dir);
1001
}
1002
if(p->environ[0] == NULL){
1003
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
1006
}
1007
} else {
1008
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
1011
}
1070
if(fexecve(plugin_fd, p->argv,
1071
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1072
error(0, errno, "fexecve for %s/%s",
1073
plugindir != NULL ? plugindir : PDIR,
1074
direntries[i]->d_name);
1075
_exit(EX_OSERR);
1012
1076
}
1013
1077
/* no return */
1014
1078
}
1015
1079
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
1018
free(filename);
1019
plugin *new_plugin = getplugin(dirst->d_name);
1080
close(pipefd[1]); /* Close unused write end of pipe */
1081
close(plugin_fd);
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
1020
1083
if(new_plugin == NULL){
1021
1084
error(0, errno, "getplugin");
1022
1085
ret = (int)(TEMP_FAILURE_RETRY
1026
1089
error(0, errno, "sigprocmask");
1027
1090
}
1028
1091
exitstatus = EX_OSERR;
1092
free(direntries[i]);
1029
1093
goto fallback;
1030
1094
}
1095
free(direntries[i]);
1031
1096
1032
1097
new_plugin->pid = pid;
1033
1098
new_plugin->fd = pipefd[0];
1034
1099
1100
if(debug){
1101
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1102
new_plugin->name, (intmax_t) (new_plugin->pid));
1103
}
1104
1035
1105
/* Unblock SIGCHLD so signal handler can be run if this process
1036
1106
has already completed */
1037
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1043
1113
goto fallback;
1044
1114
}
1045
1115
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
1116
FD_SET(new_plugin->fd, &rfds_all);
1048
1117
1049
1118
if(maxfd < new_plugin->fd){
1050
1119
maxfd = new_plugin->fd;
1051
1120
}
1052
1121
}
1053
1122
1054
TEMP_FAILURE_RETRY(closedir(dir));
1055
dir = NULL;
1123
free(direntries);
1124
direntries = NULL;
1125
close(dir_fd);
1126
dir_fd = -1;
1056
1127
free_plugin(getplugin(NULL));
1057
1128
1058
1129
for(plugin *p = plugin_list; p != NULL; p = p->next){
1097
1168
(intmax_t) (proc->pid),
1098
1169
WTERMSIG(proc->status),
1099
1170
strsignal(WTERMSIG(proc->status)));
1100
} else if(WCOREDUMP(proc->status)){
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
1103
1171
}
1104
1172
}
1105
1173
1106
1174
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1175
FD_CLR(proc->fd, &rfds_all);
1109
1176
1110
1177
/* Block signal while modifying process_list */
1111
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1151
1218
}
1152
1219
1153
1220
/* This process has not completed. Does it have any output? */
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1221
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
1222
/* This process had nothing to say at this time */
1158
1223
proc = proc->next;
1159
1224
continue;
1160
1225
}
1161
1226
/* Before reading, make the process' data buffer large enough */
1162
1227
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
+ (size_t) BUFFER_SIZE);
1165
if(proc->buffer == NULL){
1228
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1229
+ (size_t) BUFFER_SIZE);
1230
if(new_buffer == NULL){
1166
1231
error(0, errno, "malloc");
1167
1232
exitstatus = EX_OSERR;
1168
1233
goto fallback;
1169
1234
}
1235
proc->buffer = new_buffer;
1170
1236
proc->buffer_size += BUFFER_SIZE;
1171
1237
}
1172
1238
/* Read from the process */
1225
1291
free(custom_argv);
1226
1292
}
1227
1293
1228
if(dir != NULL){
1229
closedir(dir);
1294
free(direntries);
1295
1296
if(dir_fd != -1){
1297
close(dir_fd);
1230
1298
}
1231
1299
1232
1300
/* Kill the processes */
1252
1320
free_plugin_list();
1253
1321
1254
1322
free(plugindir);
1323
free(pluginhelperdir);
1255
1324
free(argfile);
1256
1325
1257
1326
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0