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- Committer: Teddy Hogeborn
- Date: 2024-09-12 18:31:12 UTC
- mfrom: (237.4.142 release)
- Revision ID: teddy@recompile.se-20240912183112-xxy0akg67c0ky0t8
Merge from release branch
- files added:
- bugs.xml
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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 © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 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
#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;
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
98
84
99
typedef struct plugin{
85
100
char *name; /* can be NULL or any plugin name */
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 */
190
__attribute__((nonnull, warn_unused_result))
174
191
static bool add_to_char_array(const char *new, char ***array,
175
192
int *len){
176
193
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
177
195
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} 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);
181
210
/* Malloc check */
182
if(*array == NULL){
211
if(new_array == NULL){
183
212
return false;
184
213
}
214
*array = new_array;
185
215
/* Make a copy of the new string */
186
216
char *copy;
187
217
do {
199
229
}
200
230
201
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
202
233
static bool add_argument(plugin *p, const char *arg){
203
234
if(p == NULL){
204
235
return false;
207
238
}
208
239
209
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
210
242
static bool add_environment(plugin *p, const char *def, bool replace){
211
243
if(p == NULL){
212
244
return false;
214
246
/* namelen = length of name of environment variable */
215
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
248
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
219
251
/* It already exists */
220
252
if(replace){
221
char *new;
253
char *new_envdef;
222
254
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
226
258
return false;
227
259
}
228
*e = new;
229
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
230
262
}
231
263
return true;
232
264
}
234
266
return add_to_char_array(def, &(p->environ), &(p->envc));
235
267
}
236
268
269
#ifndef O_CLOEXEC
237
270
/*
238
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
272
* Descriptor Flags".
240
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
241
274
*/
275
__attribute__((warn_unused_result))
242
276
static int set_cloexec_flag(int fd){
243
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
244
278
/* If reading the flags failed, return error indication now. */
249
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
284
ret | FD_CLOEXEC));
251
285
}
286
#endif /* not O_CLOEXEC */
252
287
253
288
254
289
/* Mark processes as completed when they exit, and save their exit
286
321
}
287
322
288
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
289
325
static bool print_out_password(const char *buffer, size_t length){
290
326
ssize_t ret;
291
327
for(size_t written = 0; written < length; written += (size_t)ret){
299
335
}
300
336
301
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
302
339
static void free_plugin(plugin *plugin_node){
303
340
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
305
342
free(*arg);
306
343
}
344
free(plugin_node->name);
307
345
free(plugin_node->argv);
308
346
for(char **env = plugin_node->environ; *env != NULL; env++){
309
347
free(*env);
336
374
337
375
int main(int argc, char *argv[]){
338
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
339
378
char *argfile = NULL;
340
379
FILE *conffp;
341
size_t d_name_len;
342
DIR *dir = NULL;
343
struct dirent *dirst;
380
struct dirent **direntries = NULL;
344
381
struct stat st;
345
382
fd_set rfds_all;
346
383
int ret, maxfd = 0;
354
391
.sa_flags = SA_NOCLDSTOP };
355
392
char **custom_argv = NULL;
356
393
int custom_argc = 0;
394
int dir_fd = -1;
357
395
358
396
/* Establish a signal handler */
359
397
sigemptyset(&sigchld_action.sa_mask);
404
442
.doc = "Group ID the plugins will run as", .group = 3 },
405
443
{ .name = "debug", .key = 132,
406
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 },
407
449
/*
408
450
* These reproduce what we would get without ARGP_NO_HELP
409
451
*/
416
458
{ .name = NULL }
417
459
};
418
460
461
__attribute__((nonnull(3)))
419
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
463
errno = 0;
421
464
switch(key){
422
465
char *tmp;
423
intmax_t tmpmax;
466
intmax_t tmp_id;
424
467
case 'g': /* --global-options */
425
468
{
426
469
char *plugin_option;
429
472
break;
430
473
}
431
474
}
475
errno = 0;
432
476
}
433
477
break;
434
478
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
436
482
break;
437
483
case 'o': /* --options-for */
438
484
{
455
501
break;
456
502
}
457
503
}
504
errno = 0;
458
505
}
459
506
break;
460
507
case 'E': /* --env-for */
472
519
errno = EINVAL;
473
520
break;
474
521
}
475
add_environment(getplugin(arg), envdef, true);
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
476
525
}
477
526
break;
478
527
case 'd': /* --disable */
480
529
plugin *p = getplugin(arg);
481
530
if(p != NULL){
482
531
p->disabled = true;
532
errno = 0;
483
533
}
484
534
}
485
535
break;
488
538
plugin *p = getplugin(arg);
489
539
if(p != NULL){
490
540
p->disabled = false;
541
errno = 0;
491
542
}
492
543
}
493
544
break;
494
545
case 128: /* --plugin-dir */
495
546
free(plugindir);
496
547
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
497
551
break;
498
552
case 129: /* --config-file */
499
553
/* This is already done by parse_opt_config_file() */
500
554
break;
501
555
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
556
tmp_id = strtoimax(arg, &tmp, 10);
503
557
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
558
or tmp_id != (uid_t)tmp_id){
505
559
argp_error(state, "Bad user ID number: \"%s\", using %"
506
560
PRIdMAX, arg, (intmax_t)uid);
507
561
break;
508
562
}
509
uid = (uid_t)tmpmax;
563
uid = (uid_t)tmp_id;
564
errno = 0;
510
565
break;
511
566
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
567
tmp_id = strtoimax(arg, &tmp, 10);
513
568
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
569
or tmp_id != (gid_t)tmp_id){
515
570
argp_error(state, "Bad group ID number: \"%s\", using %"
516
571
PRIdMAX, arg, (intmax_t)gid);
517
572
break;
518
573
}
519
gid = (gid_t)tmpmax;
574
gid = (gid_t)tmp_id;
575
errno = 0;
520
576
break;
521
577
case 132: /* --debug */
522
578
debug = true;
523
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;
524
587
/*
525
588
* These reproduce what we would get without ARGP_NO_HELP
526
589
*/
527
590
case '?': /* --help */
528
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
530
594
case -3: /* --usage */
531
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
596
argp_state_help(state, state->out_stream,
533
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
534
599
case 'V': /* --version */
535
600
fprintf(state->out_stream, "%s\n", argp_program_version);
536
601
exit(EXIT_SUCCESS);
546
611
if(arg[0] == '\0'){
547
612
break;
548
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
549
619
default:
550
620
return ARGP_ERR_UNKNOWN;
551
621
}
570
640
case 129: /* --config-file */
571
641
free(argfile);
572
642
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
573
646
break;
574
647
case 130: /* --userid */
575
648
case 131: /* --groupid */
576
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
577
651
case '?': /* --help */
578
652
case -3: /* --usage */
579
653
case 'V': /* --version */
658
732
}
659
733
660
734
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;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
668
759
}
669
760
custom_argv[custom_argc-1] = new_arg;
670
761
custom_argv[custom_argc] = NULL;
728
819
goto fallback;
729
820
}
730
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
838
}
839
731
840
if(debug){
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
733
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
734
843
p->name ? p->name : "Global", p->argc - 1);
735
844
for(char **a = p->argv; *a != NULL; a++){
742
851
}
743
852
}
744
853
745
/* Strip permissions down to nobody */
746
setgid(gid);
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
747
889
if(ret == -1){
748
890
error(0, errno, "setgid");
749
891
}
754
896
755
897
/* Open plugin directory with close_on_exec flag */
756
898
{
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
}
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
775
906
if(dir_fd == -1){
776
907
error(0, errno, "Could not open plugin dir");
777
908
exitstatus = EX_UNAVAILABLE;
783
914
ret = set_cloexec_flag(dir_fd);
784
915
if(ret < 0){
785
916
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
917
exitstatus = EX_OSERR;
788
918
goto fallback;
789
919
}
790
920
#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;
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
943
}
798
944
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
799
955
}
800
956
801
957
FD_ZERO(&rfds_all);
802
958
803
959
/* 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");
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
876
966
continue;
877
967
}
878
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
880
969
if(ret == -1){
881
970
error(0, errno, "stat");
882
free(filename);
971
close(plugin_fd);
972
free(direntries[i]);
883
973
continue;
884
974
}
885
975
886
976
/* Ignore non-executable files */
887
977
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
889
980
if(debug){
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
" with bad type or mode\n", filename);
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
892
985
}
893
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
894
988
continue;
895
989
}
896
990
897
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
898
992
if(p == NULL){
899
993
error(0, errno, "getplugin");
900
free(filename);
994
close(plugin_fd);
995
free(direntries[i]);
901
996
continue;
902
997
}
903
998
if(p->disabled){
904
999
if(debug){
905
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
906
dirst->d_name);
1001
direntries[i]->d_name);
907
1002
}
908
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
909
1005
continue;
910
1006
}
911
1007
{
925
1021
}
926
1022
}
927
1023
}
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. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
931
1026
if(p->environ[0] != NULL){
932
1027
for(char **e = environ; *e != NULL; e++){
933
1028
if(not add_environment(p, *e, false)){
937
1032
}
938
1033
939
1034
int pipefd[2];
1035
#ifndef O_CLOEXEC
940
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
941
1040
if(ret == -1){
942
1041
error(0, errno, "pipe");
943
1042
exitstatus = EX_OSERR;
944
goto fallback;
945
}
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
946
1056
/* Ask OS to automatic close the pipe on exec */
947
1057
ret = set_cloexec_flag(pipefd[0]);
948
1058
if(ret < 0){
949
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
950
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
951
1064
goto fallback;
952
1065
}
953
1066
ret = set_cloexec_flag(pipefd[1]);
954
1067
if(ret < 0){
955
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
956
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
957
1073
goto fallback;
958
1074
}
1075
#endif /* not O_CLOEXEC */
959
1076
/* Block SIGCHLD until process is safely in process list */
960
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
1078
&sigchld_action.sa_mask,
963
1080
if(ret < 0){
964
1081
error(0, errno, "sigprocmask");
965
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
966
1084
goto fallback;
967
1085
}
968
1086
/* Starting a new process to be watched */
972
1090
} while(pid == -1 and errno == EINTR);
973
1091
if(pid == -1){
974
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
975
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
976
1099
goto fallback;
977
1100
}
978
1101
if(pid == 0){
994
1117
_exit(EX_OSERR);
995
1118
}
996
1119
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
}
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
1012
1126
}
1013
1127
/* no return */
1014
1128
}
1015
1129
/* 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);
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1020
1133
if(new_plugin == NULL){
1021
1134
error(0, errno, "getplugin");
1022
1135
ret = (int)(TEMP_FAILURE_RETRY
1026
1139
error(0, errno, "sigprocmask");
1027
1140
}
1028
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
1029
1143
goto fallback;
1030
1144
}
1145
free(direntries[i]);
1031
1146
1032
1147
new_plugin->pid = pid;
1033
1148
new_plugin->fd = pipefd[0];
1034
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
1035
1155
/* Unblock SIGCHLD so signal handler can be run if this process
1036
1156
has already completed */
1037
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1043
1163
goto fallback;
1044
1164
}
1045
1165
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
1166
FD_SET(new_plugin->fd, &rfds_all);
1048
1167
1049
1168
if(maxfd < new_plugin->fd){
1050
1169
maxfd = new_plugin->fd;
1051
1170
}
1052
1171
}
1053
1172
1054
TEMP_FAILURE_RETRY(closedir(dir));
1055
dir = NULL;
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1056
1177
free_plugin(getplugin(NULL));
1057
1178
1058
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
1097
1218
(intmax_t) (proc->pid),
1098
1219
WTERMSIG(proc->status),
1099
1220
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
1221
}
1104
1222
}
1105
1223
1106
1224
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1225
FD_CLR(proc->fd, &rfds_all);
1109
1226
1110
1227
/* Block signal while modifying process_list */
1111
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1151
1268
}
1152
1269
1153
1270
/* 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 */
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
1272
/* This process had nothing to say at this time */
1158
1273
proc = proc->next;
1159
1274
continue;
1160
1275
}
1161
1276
/* Before reading, make the process' data buffer large enough */
1162
1277
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){
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1166
1281
error(0, errno, "malloc");
1167
1282
exitstatus = EX_OSERR;
1168
1283
goto fallback;
1169
1284
}
1285
proc->buffer = new_buffer;
1170
1286
proc->buffer_size += BUFFER_SIZE;
1171
1287
}
1172
1288
/* Read from the process */
1225
1341
free(custom_argv);
1226
1342
}
1227
1343
1228
if(dir != NULL){
1229
closedir(dir);
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1230
1348
}
1231
1349
1232
1350
/* Kill the processes */
1252
1370
free_plugin_list();
1253
1371
1254
1372
free(plugindir);
1373
free(pluginhelperdir);
1255
1374
free(argfile);
1256
1375
1257
1376
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0