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- Committer: Teddy Hogeborn
- Date: 2021-03-21 18:44:59 UTC
- Revision ID: teddy@recompile.se-20210321184459-467agedq40ajs7ac
Use _FORTIFY_SOURCE=3, supported by GNU C Library version 2.33
* Makefile (FORTIFY): Changed to use "-D_FORTIFY_SOURCE=3".
* Makefile (FORTIFY): Changed to use "-D_FORTIFY_SOURCE=3".
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- 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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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 © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 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
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
27
42
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#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() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
54
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
71
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
75
89
76
90
#define BUFFER_SIZE 256
77
91
78
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
79
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
95
81
96
const char *argp_program_version = "plugin-runner " VERSION;
105
120
106
121
/* Gets an existing plugin based on name,
107
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
108
124
static plugin *getplugin(char *name){
109
125
/* Check for existing plugin with that name */
110
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
171
187
}
172
188
173
189
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
190
__attribute__((nonnull, warn_unused_result))
175
191
static bool add_to_char_array(const char *new, char ***array,
176
192
int *len){
177
193
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
178
195
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
182
210
/* Malloc check */
183
if(*array == NULL){
211
if(new_array == NULL){
184
212
return false;
185
213
}
214
*array = new_array;
186
215
/* Make a copy of the new string */
187
216
char *copy;
188
217
do {
200
229
}
201
230
202
231
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
232
__attribute__((nonnull(2), warn_unused_result))
204
233
static bool add_argument(plugin *p, const char *arg){
205
234
if(p == NULL){
206
235
return false;
209
238
}
210
239
211
240
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
241
__attribute__((nonnull(2), warn_unused_result))
213
242
static bool add_environment(plugin *p, const char *def, bool replace){
214
243
if(p == NULL){
215
244
return false;
217
246
/* namelen = length of name of environment variable */
218
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
248
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
222
251
/* It already exists */
223
252
if(replace){
224
char *new;
253
char *new_envdef;
225
254
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
229
258
return false;
230
259
}
231
*e = new;
232
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
233
262
}
234
263
return true;
235
264
}
237
266
return add_to_char_array(def, &(p->environ), &(p->envc));
238
267
}
239
268
269
#ifndef O_CLOEXEC
240
270
/*
241
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
272
* Descriptor Flags".
243
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
244
274
*/
275
__attribute__((warn_unused_result))
245
276
static int set_cloexec_flag(int fd){
246
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
247
278
/* If reading the flags failed, return error indication now. */
252
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
284
ret | FD_CLOEXEC));
254
285
}
286
#endif /* not O_CLOEXEC */
255
287
256
288
257
289
/* Mark processes as completed when they exit, and save their exit
289
321
}
290
322
291
323
/* Prints out a password to stdout */
292
__attribute__((nonnull))
324
__attribute__((nonnull, warn_unused_result))
293
325
static bool print_out_password(const char *buffer, size_t length){
294
326
ssize_t ret;
295
327
for(size_t written = 0; written < length; written += (size_t)ret){
306
338
__attribute__((nonnull))
307
339
static void free_plugin(plugin *plugin_node){
308
340
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
310
342
free(*arg);
311
343
}
344
free(plugin_node->name);
312
345
free(plugin_node->argv);
313
346
for(char **env = plugin_node->environ; *env != NULL; env++){
314
347
free(*env);
341
374
342
375
int main(int argc, char *argv[]){
343
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
344
378
char *argfile = NULL;
345
379
FILE *conffp;
346
size_t d_name_len;
347
DIR *dir = NULL;
348
struct dirent *dirst;
380
struct dirent **direntries = NULL;
349
381
struct stat st;
350
382
fd_set rfds_all;
351
383
int ret, maxfd = 0;
359
391
.sa_flags = SA_NOCLDSTOP };
360
392
char **custom_argv = NULL;
361
393
int custom_argc = 0;
394
int dir_fd = -1;
362
395
363
396
/* Establish a signal handler */
364
397
sigemptyset(&sigchld_action.sa_mask);
409
442
.doc = "Group ID the plugins will run as", .group = 3 },
410
443
{ .name = "debug", .key = 132,
411
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
412
449
/*
413
450
* These reproduce what we would get without ARGP_NO_HELP
414
451
*/
435
472
break;
436
473
}
437
474
}
475
errno = 0;
438
476
}
439
477
break;
440
478
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
442
482
break;
443
483
case 'o': /* --options-for */
444
484
{
461
501
break;
462
502
}
463
503
}
504
errno = 0;
464
505
}
465
506
break;
466
507
case 'E': /* --env-for */
478
519
errno = EINVAL;
479
520
break;
480
521
}
481
add_environment(getplugin(arg), envdef, true);
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
482
525
}
483
526
break;
484
527
case 'd': /* --disable */
486
529
plugin *p = getplugin(arg);
487
530
if(p != NULL){
488
531
p->disabled = true;
532
errno = 0;
489
533
}
490
534
}
491
535
break;
494
538
plugin *p = getplugin(arg);
495
539
if(p != NULL){
496
540
p->disabled = false;
541
errno = 0;
497
542
}
498
543
}
499
544
break;
500
545
case 128: /* --plugin-dir */
501
546
free(plugindir);
502
547
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
503
551
break;
504
552
case 129: /* --config-file */
505
553
/* This is already done by parse_opt_config_file() */
513
561
break;
514
562
}
515
563
uid = (uid_t)tmp_id;
564
errno = 0;
516
565
break;
517
566
case 131: /* --groupid */
518
567
tmp_id = strtoimax(arg, &tmp, 10);
523
572
break;
524
573
}
525
574
gid = (gid_t)tmp_id;
575
errno = 0;
526
576
break;
527
577
case 132: /* --debug */
528
578
debug = true;
529
579
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
530
587
/*
531
588
* These reproduce what we would get without ARGP_NO_HELP
532
589
*/
533
590
case '?': /* --help */
534
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
536
594
case -3: /* --usage */
537
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
596
argp_state_help(state, state->out_stream,
539
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
540
599
case 'V': /* --version */
541
600
fprintf(state->out_stream, "%s\n", argp_program_version);
542
601
exit(EXIT_SUCCESS);
552
611
if(arg[0] == '\0'){
553
612
break;
554
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
555
619
default:
556
620
return ARGP_ERR_UNKNOWN;
557
621
}
576
640
case 129: /* --config-file */
577
641
free(argfile);
578
642
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
579
646
break;
580
647
case 130: /* --userid */
581
648
case 131: /* --groupid */
582
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
583
651
case '?': /* --help */
584
652
case -3: /* --usage */
585
653
case 'V': /* --version */
664
732
}
665
733
666
734
custom_argc += 1;
667
custom_argv = realloc(custom_argv, sizeof(char *)
668
* ((unsigned int) custom_argc + 1));
669
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
672
free(org_line);
673
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
674
758
}
675
759
custom_argv[custom_argc-1] = new_arg;
676
760
custom_argv[custom_argc] = NULL;
734
818
goto fallback;
735
819
}
736
820
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
836
}
837
}
838
737
839
if(debug){
738
for(plugin *p = plugin_list; p != NULL; p=p->next){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
739
841
fprintf(stderr, "Plugin: %s has %d arguments\n",
740
842
p->name ? p->name : "Global", p->argc - 1);
741
843
for(char **a = p->argv; *a != NULL; a++){
750
852
751
853
if(getuid() == 0){
752
854
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
855
<https://bugs.debian.org/633582> */
754
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
857
if(plugindir_fd == -1){
756
error(0, errno, "open");
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
757
861
} else {
758
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
863
if(ret == -1){
766
870
}
767
871
}
768
872
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
770
883
}
771
884
}
772
885
773
886
/* Lower permissions */
774
setgid(gid);
887
ret = setgid(gid);
775
888
if(ret == -1){
776
889
error(0, errno, "setgid");
777
890
}
782
895
783
896
/* Open plugin directory with close_on_exec flag */
784
897
{
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
803
905
if(dir_fd == -1){
804
906
error(0, errno, "Could not open plugin dir");
805
907
exitstatus = EX_UNAVAILABLE;
811
913
ret = set_cloexec_flag(dir_fd);
812
914
if(ret < 0){
813
915
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
916
exitstatus = EX_OSERR;
816
917
goto fallback;
817
918
}
818
919
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
942
}
826
943
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
827
954
}
828
955
829
956
FD_ZERO(&rfds_all);
830
957
831
958
/* Read and execute any executable in the plugin directory*/
832
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
836
837
/* All directory entries have been processed */
838
if(dirst == NULL){
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
842
goto fallback;
843
}
844
break;
845
}
846
847
d_name_len = strlen(dirst->d_name);
848
849
/* Ignore dotfiles, backup files and other junk */
850
{
851
bool bad_name = false;
852
853
const char const *bad_prefixes[] = { ".", "#", NULL };
854
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
856
".dpkg-old",
857
".dpkg-bak",
858
".dpkg-divert", NULL };
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
860
size_t pre_len = strlen(*pre);
861
if((d_name_len >= pre_len)
862
and strncmp((dirst->d_name), *pre, pre_len) == 0){
863
if(debug){
864
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
865
" with bad prefix %s\n", dirst->d_name, *pre);
866
}
867
bad_name = true;
868
break;
869
}
870
}
871
if(bad_name){
872
continue;
873
}
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
size_t suf_len = strlen(*suf);
876
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
878
== 0)){
879
if(debug){
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
881
" with bad suffix %s\n", dirst->d_name, *suf);
882
}
883
bad_name = true;
884
break;
885
}
886
}
887
888
if(bad_name){
889
continue;
890
}
891
}
892
893
char *filename;
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
897
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
901
}
902
if(ret < 0){
903
error(0, errno, "asprintf");
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
904
965
continue;
905
966
}
906
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
908
968
if(ret == -1){
909
969
error(0, errno, "stat");
910
free(filename);
970
close(plugin_fd);
971
free(direntries[i]);
911
972
continue;
912
973
}
913
974
914
975
/* Ignore non-executable files */
915
976
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
917
979
if(debug){
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
" with bad type or mode\n", filename);
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
920
984
}
921
free(filename);
985
close(plugin_fd);
986
free(direntries[i]);
922
987
continue;
923
988
}
924
989
925
plugin *p = getplugin(dirst->d_name);
990
plugin *p = getplugin(direntries[i]->d_name);
926
991
if(p == NULL){
927
992
error(0, errno, "getplugin");
928
free(filename);
993
close(plugin_fd);
994
free(direntries[i]);
929
995
continue;
930
996
}
931
997
if(p->disabled){
932
998
if(debug){
933
999
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
934
dirst->d_name);
1000
direntries[i]->d_name);
935
1001
}
936
free(filename);
1002
close(plugin_fd);
1003
free(direntries[i]);
937
1004
continue;
938
1005
}
939
1006
{
953
1020
}
954
1021
}
955
1022
}
956
/* If this plugin has any environment variables, we will call
957
using execve and need to duplicate the environment from this
958
process, too. */
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
959
1025
if(p->environ[0] != NULL){
960
1026
for(char **e = environ; *e != NULL; e++){
961
1027
if(not add_environment(p, *e, false)){
965
1031
}
966
1032
967
1033
int pipefd[2];
1034
#ifndef O_CLOEXEC
968
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
969
1039
if(ret == -1){
970
1040
error(0, errno, "pipe");
971
1041
exitstatus = EX_OSERR;
972
goto fallback;
973
}
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
974
1055
/* Ask OS to automatic close the pipe on exec */
975
1056
ret = set_cloexec_flag(pipefd[0]);
976
1057
if(ret < 0){
977
1058
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
978
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
979
1063
goto fallback;
980
1064
}
981
1065
ret = set_cloexec_flag(pipefd[1]);
982
1066
if(ret < 0){
983
1067
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
984
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
985
1072
goto fallback;
986
1073
}
1074
#endif /* not O_CLOEXEC */
987
1075
/* Block SIGCHLD until process is safely in process list */
988
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
1077
&sigchld_action.sa_mask,
991
1079
if(ret < 0){
992
1080
error(0, errno, "sigprocmask");
993
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
994
1083
goto fallback;
995
1084
}
996
1085
/* Starting a new process to be watched */
1000
1089
} while(pid == -1 and errno == EINTR);
1001
1090
if(pid == -1){
1002
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1003
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
1004
1098
goto fallback;
1005
1099
}
1006
1100
if(pid == 0){
1022
1116
_exit(EX_OSERR);
1023
1117
}
1024
1118
1025
if(dirfd(dir) < 0){
1026
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1027
above and must now close it manually here. */
1028
closedir(dir);
1029
}
1030
if(p->environ[0] == NULL){
1031
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
1034
}
1035
} else {
1036
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
1039
}
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
1040
1125
}
1041
1126
/* no return */
1042
1127
}
1043
1128
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
free(filename);
1047
plugin *new_plugin = getplugin(dirst->d_name);
1129
close(pipefd[1]); /* Close unused write end of pipe */
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
1132
if(new_plugin == NULL){
1049
1133
error(0, errno, "getplugin");
1050
1134
ret = (int)(TEMP_FAILURE_RETRY
1054
1138
error(0, errno, "sigprocmask");
1055
1139
}
1056
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
1057
1142
goto fallback;
1058
1143
}
1144
free(direntries[i]);
1059
1145
1060
1146
new_plugin->pid = pid;
1061
1147
new_plugin->fd = pipefd[0];
1062
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
1063
1154
/* Unblock SIGCHLD so signal handler can be run if this process
1064
1155
has already completed */
1065
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1071
1162
goto fallback;
1072
1163
}
1073
1164
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
1165
FD_SET(new_plugin->fd, &rfds_all);
1076
1166
1077
1167
if(maxfd < new_plugin->fd){
1078
1168
maxfd = new_plugin->fd;
1079
1169
}
1080
1170
}
1081
1171
1082
TEMP_FAILURE_RETRY(closedir(dir));
1083
dir = NULL;
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
1084
1176
free_plugin(getplugin(NULL));
1085
1177
1086
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
1125
1217
(intmax_t) (proc->pid),
1126
1218
WTERMSIG(proc->status),
1127
1219
strsignal(WTERMSIG(proc->status)));
1128
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
1131
1220
}
1132
1221
}
1133
1222
1134
1223
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1224
FD_CLR(proc->fd, &rfds_all);
1137
1225
1138
1226
/* Block signal while modifying process_list */
1139
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
1267
}
1180
1268
1181
1269
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1270
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
1271
/* This process had nothing to say at this time */
1186
1272
proc = proc->next;
1187
1273
continue;
1188
1274
}
1189
1275
/* Before reading, make the process' data buffer large enough */
1190
1276
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1194
1280
error(0, errno, "malloc");
1195
1281
exitstatus = EX_OSERR;
1196
1282
goto fallback;
1197
1283
}
1284
proc->buffer = new_buffer;
1198
1285
proc->buffer_size += BUFFER_SIZE;
1199
1286
}
1200
1287
/* Read from the process */
1253
1340
free(custom_argv);
1254
1341
}
1255
1342
1256
if(dir != NULL){
1257
closedir(dir);
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1258
1347
}
1259
1348
1260
1349
/* Kill the processes */
1280
1369
free_plugin_list();
1281
1370
1282
1371
free(plugindir);
1372
free(pluginhelperdir);
1283
1373
free(argfile);
1284
1374
1285
1375
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0