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- Committer: teddy at recompile
- Date: 2020-02-09 17:57:08 UTC
- Revision ID: teddy@recompile.se-20200209175708-bmprnuxqmr2lkhfh
initramfs-tools-hook: Properly quote argument to test -n
* initramfs-tools-hook: Quote output from subshell so that test -n
always get exactly one argument, never more than one.
* initramfs-tools-hook: Quote output from subshell so that test -n
always get exactly one argument, never more than one.
- files added:
- DBUS-API
- 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 © 2008-2018 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
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
30
31
#include <stdbool.h> /* bool, true, false */
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() */
32
#include <stdio.h> /* fileno(), fprintf(),
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() */
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,
68
67
*/
69
68
#include <errno.h> /* errno, EBADF */
70
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
72
75
73
76
#define BUFFER_SIZE 256
74
77
75
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
76
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
81
78
82
const char *argp_program_version = "plugin-runner " VERSION;
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
84
81
85
typedef struct plugin{
82
86
char *name; /* can be NULL or any plugin name */
102
106
103
107
/* Gets an existing plugin based on name,
104
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
105
110
static plugin *getplugin(char *name){
106
111
/* Check for existing plugin with that name */
107
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
168
173
}
169
174
170
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
171
177
static bool add_to_char_array(const char *new, char ***array,
172
178
int *len){
173
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
174
181
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
178
196
/* Malloc check */
179
if(*array == NULL){
197
if(new_array == NULL){
180
198
return false;
181
199
}
200
*array = new_array;
182
201
/* Make a copy of the new string */
183
202
char *copy;
184
203
do {
196
215
}
197
216
198
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
199
219
static bool add_argument(plugin *p, const char *arg){
200
220
if(p == NULL){
201
221
return false;
204
224
}
205
225
206
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
207
228
static bool add_environment(plugin *p, const char *def, bool replace){
208
229
if(p == NULL){
209
230
return false;
211
232
/* namelen = length of name of environment variable */
212
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
234
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
216
237
/* It already exists */
217
238
if(replace){
218
char *new;
239
char *new_envdef;
219
240
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
222
if(new == NULL){
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
223
244
return false;
224
245
}
225
*e = new;
226
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
227
248
}
228
249
return true;
229
250
}
231
252
return add_to_char_array(def, &(p->environ), &(p->envc));
232
253
}
233
254
255
#ifndef O_CLOEXEC
234
256
/*
235
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
258
* Descriptor Flags".
237
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
238
260
*/
261
__attribute__((warn_unused_result))
239
262
static int set_cloexec_flag(int fd){
240
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
241
264
/* If reading the flags failed, return error indication now. */
246
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
270
ret | FD_CLOEXEC));
248
271
}
272
#endif /* not O_CLOEXEC */
249
273
250
274
251
275
/* Mark processes as completed when they exit, and save their exit
265
289
/* No child processes */
266
290
break;
267
291
}
268
perror("waitpid");
292
error(0, errno, "waitpid");
269
293
}
270
294
271
295
/* A child exited, find it in process_list */
283
307
}
284
308
285
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
286
311
static bool print_out_password(const char *buffer, size_t length){
287
312
ssize_t ret;
288
313
for(size_t written = 0; written < length; written += (size_t)ret){
296
321
}
297
322
298
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
299
325
static void free_plugin(plugin *plugin_node){
300
326
301
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
302
328
free(*arg);
303
329
}
330
free(plugin_node->name);
304
331
free(plugin_node->argv);
305
332
for(char **env = plugin_node->environ; *env != NULL; env++){
306
333
free(*env);
333
360
334
361
int main(int argc, char *argv[]){
335
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
336
364
char *argfile = NULL;
337
365
FILE *conffp;
338
size_t d_name_len;
339
DIR *dir = NULL;
340
struct dirent *dirst;
366
struct dirent **direntries = NULL;
341
367
struct stat st;
342
368
fd_set rfds_all;
343
369
int ret, maxfd = 0;
351
377
.sa_flags = SA_NOCLDSTOP };
352
378
char **custom_argv = NULL;
353
379
int custom_argc = 0;
380
int dir_fd = -1;
354
381
355
382
/* Establish a signal handler */
356
383
sigemptyset(&sigchld_action.sa_mask);
357
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
385
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
361
388
goto fallback;
362
389
}
363
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
391
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
367
394
goto fallback;
368
395
}
369
396
401
428
.doc = "Group ID the plugins will run as", .group = 3 },
402
429
{ .name = "debug", .key = 132,
403
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
404
435
/*
405
436
* These reproduce what we would get without ARGP_NO_HELP
406
437
*/
413
444
{ .name = NULL }
414
445
};
415
446
447
__attribute__((nonnull(3)))
416
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
449
errno = 0;
418
450
switch(key){
419
451
char *tmp;
420
intmax_t tmpmax;
452
intmax_t tmp_id;
421
453
case 'g': /* --global-options */
422
454
{
423
455
char *plugin_option;
426
458
break;
427
459
}
428
460
}
461
errno = 0;
429
462
}
430
463
break;
431
464
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
433
468
break;
434
469
case 'o': /* --options-for */
435
470
{
452
487
break;
453
488
}
454
489
}
490
errno = 0;
455
491
}
456
492
break;
457
493
case 'E': /* --env-for */
469
505
errno = EINVAL;
470
506
break;
471
507
}
472
add_environment(getplugin(arg), envdef, true);
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
473
511
}
474
512
break;
475
513
case 'd': /* --disable */
477
515
plugin *p = getplugin(arg);
478
516
if(p != NULL){
479
517
p->disabled = true;
518
errno = 0;
480
519
}
481
520
}
482
521
break;
485
524
plugin *p = getplugin(arg);
486
525
if(p != NULL){
487
526
p->disabled = false;
527
errno = 0;
488
528
}
489
529
}
490
530
break;
491
531
case 128: /* --plugin-dir */
492
532
free(plugindir);
493
533
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
494
537
break;
495
538
case 129: /* --config-file */
496
539
/* This is already done by parse_opt_config_file() */
497
540
break;
498
541
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
500
543
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
544
or tmp_id != (uid_t)tmp_id){
502
545
argp_error(state, "Bad user ID number: \"%s\", using %"
503
546
PRIdMAX, arg, (intmax_t)uid);
504
547
break;
505
548
}
506
uid = (uid_t)tmpmax;
549
uid = (uid_t)tmp_id;
550
errno = 0;
507
551
break;
508
552
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
553
tmp_id = strtoimax(arg, &tmp, 10);
510
554
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
555
or tmp_id != (gid_t)tmp_id){
512
556
argp_error(state, "Bad group ID number: \"%s\", using %"
513
557
PRIdMAX, arg, (intmax_t)gid);
514
558
break;
515
559
}
516
gid = (gid_t)tmpmax;
560
gid = (gid_t)tmp_id;
561
errno = 0;
517
562
break;
518
563
case 132: /* --debug */
519
564
debug = true;
520
565
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
521
573
/*
522
574
* These reproduce what we would get without ARGP_NO_HELP
523
575
*/
524
576
case '?': /* --help */
525
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
527
580
case -3: /* --usage */
528
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
582
argp_state_help(state, state->out_stream,
530
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
531
585
case 'V': /* --version */
532
586
fprintf(state->out_stream, "%s\n", argp_program_version);
533
587
exit(EXIT_SUCCESS);
543
597
if(arg[0] == '\0'){
544
598
break;
545
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
546
605
default:
547
606
return ARGP_ERR_UNKNOWN;
548
607
}
567
626
case 129: /* --config-file */
568
627
free(argfile);
569
628
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
570
632
break;
571
633
case 130: /* --userid */
572
634
case 131: /* --groupid */
573
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
574
637
case '?': /* --help */
575
638
case -3: /* --usage */
576
639
case 'V': /* --version */
598
661
case ENOMEM:
599
662
default:
600
663
errno = ret;
601
perror("argp_parse");
664
error(0, errno, "argp_parse");
602
665
exitstatus = EX_OSERR;
603
666
goto fallback;
604
667
case EINVAL:
625
688
custom_argc = 1;
626
689
custom_argv = malloc(sizeof(char*) * 2);
627
690
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
630
693
goto fallback;
631
694
}
632
695
custom_argv[0] = argv[0];
648
711
}
649
712
new_arg = strdup(p);
650
713
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
653
716
free(org_line);
654
717
goto fallback;
655
718
}
656
719
657
720
custom_argc += 1;
658
custom_argv = realloc(custom_argv, sizeof(char *)
659
* ((unsigned int) custom_argc + 1));
660
if(custom_argv == NULL){
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
663
free(org_line);
664
goto fallback;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
665
744
}
666
745
custom_argv[custom_argc-1] = new_arg;
667
746
custom_argv[custom_argc] = NULL;
671
750
ret = fclose(conffp);
672
751
} while(ret == EOF and errno == EINTR);
673
752
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
676
755
goto fallback;
677
756
}
678
757
free(org_line);
680
759
/* Check for harmful errors and go to fallback. Other errors might
681
760
not affect opening plugins */
682
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
685
764
goto fallback;
686
765
}
687
766
}
697
776
case ENOMEM:
698
777
default:
699
778
errno = ret;
700
perror("argp_parse");
779
error(0, errno, "argp_parse");
701
780
exitstatus = EX_OSERR;
702
781
goto fallback;
703
782
case EINVAL:
717
796
case ENOMEM:
718
797
default:
719
798
errno = ret;
720
perror("argp_parse");
799
error(0, errno, "argp_parse");
721
800
exitstatus = EX_OSERR;
722
801
goto fallback;
723
802
case EINVAL:
725
804
goto fallback;
726
805
}
727
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
823
}
824
728
825
if(debug){
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
730
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
731
828
p->name ? p->name : "Global", p->argc - 1);
732
829
for(char **a = p->argv; *a != NULL; a++){
739
836
}
740
837
}
741
838
742
/* Strip permissions down to nobody */
743
setgid(gid);
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
744
865
if(ret == -1){
745
perror("setgid");
866
error(0, errno, "setgid");
746
867
}
747
868
ret = setuid(uid);
748
869
if(ret == -1){
749
perror("setuid");
870
error(0, errno, "setuid");
750
871
}
751
872
752
873
/* Open plugin directory with close_on_exec flag */
753
874
{
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
772
882
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
775
885
goto fallback;
776
886
}
777
887
779
889
/* Set the FD_CLOEXEC flag on the directory */
780
890
ret = set_cloexec_flag(dir_fd);
781
891
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
785
894
goto fallback;
786
895
}
787
896
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
919
}
795
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
796
931
}
797
932
798
933
FD_ZERO(&rfds_all);
799
934
800
935
/* Read and execute any executable in the plugin directory*/
801
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
805
806
/* All directory entries have been processed */
807
if(dirst == NULL){
808
if(errno == EBADF){
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
811
goto fallback;
812
}
813
break;
814
}
815
816
d_name_len = strlen(dirst->d_name);
817
818
/* Ignore dotfiles, backup files and other junk */
819
{
820
bool bad_name = false;
821
822
const char const *bad_prefixes[] = { ".", "#", NULL };
823
824
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
".dpkg-old",
826
".dpkg-bak",
827
".dpkg-divert", NULL };
828
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
size_t pre_len = strlen(*pre);
830
if((d_name_len >= pre_len)
831
and strncmp((dirst->d_name), *pre, pre_len) == 0){
832
if(debug){
833
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
834
" with bad prefix %s\n", dirst->d_name, *pre);
835
}
836
bad_name = true;
837
break;
838
}
839
}
840
if(bad_name){
841
continue;
842
}
843
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
844
size_t suf_len = strlen(*suf);
845
if((d_name_len >= suf_len)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
847
== 0)){
848
if(debug){
849
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
850
" with bad suffix %s\n", dirst->d_name, *suf);
851
}
852
bad_name = true;
853
break;
854
}
855
}
856
857
if(bad_name){
858
continue;
859
}
860
}
861
862
char *filename;
863
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
866
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
870
}
871
if(ret < 0){
872
perror("asprintf");
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
873
942
continue;
874
943
}
875
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
877
945
if(ret == -1){
878
perror("stat");
879
free(filename);
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
880
949
continue;
881
950
}
882
951
883
952
/* Ignore non-executable files */
884
953
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
886
956
if(debug){
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
889
961
}
890
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
891
964
continue;
892
965
}
893
966
894
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
895
968
if(p == NULL){
896
perror("getplugin");
897
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
898
972
continue;
899
973
}
900
974
if(p->disabled){
901
975
if(debug){
902
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
903
dirst->d_name);
977
direntries[i]->d_name);
904
978
}
905
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
906
981
continue;
907
982
}
908
983
{
911
986
if(g != NULL){
912
987
for(char **a = g->argv + 1; *a != NULL; a++){
913
988
if(not add_argument(p, *a)){
914
perror("add_argument");
989
error(0, errno, "add_argument");
915
990
}
916
991
}
917
992
/* Add global environment variables */
918
993
for(char **e = g->environ; *e != NULL; e++){
919
994
if(not add_environment(p, *e, false)){
920
perror("add_environment");
995
error(0, errno, "add_environment");
921
996
}
922
997
}
923
998
}
924
999
}
925
/* If this plugin has any environment variables, we will call
926
using execve and need to duplicate the environment from this
927
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
928
1002
if(p->environ[0] != NULL){
929
1003
for(char **e = environ; *e != NULL; e++){
930
1004
if(not add_environment(p, *e, false)){
931
perror("add_environment");
1005
error(0, errno, "add_environment");
932
1006
}
933
1007
}
934
1008
}
935
1009
936
1010
int pipefd[2];
1011
#ifndef O_CLOEXEC
937
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
938
1016
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
941
goto fallback;
942
}
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
943
1032
/* Ask OS to automatic close the pipe on exec */
944
1033
ret = set_cloexec_flag(pipefd[0]);
945
1034
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
948
1040
goto fallback;
949
1041
}
950
1042
ret = set_cloexec_flag(pipefd[1]);
951
1043
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
954
1049
goto fallback;
955
1050
}
1051
#endif /* not O_CLOEXEC */
956
1052
/* Block SIGCHLD until process is safely in process list */
957
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
1054
&sigchld_action.sa_mask,
959
1055
NULL));
960
1056
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
963
1060
goto fallback;
964
1061
}
965
1062
/* Starting a new process to be watched */
968
1065
pid = fork();
969
1066
} while(pid == -1 and errno == EINTR);
970
1067
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
973
1075
goto fallback;
974
1076
}
975
1077
if(pid == 0){
976
1078
/* this is the child process */
977
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
1080
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
981
1083
}
982
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
1085
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
986
1088
}
987
1089
988
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
1091
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
992
1094
}
993
1095
994
if(dirfd(dir) < 0){
995
/* If dir has no file descriptor, we could not set FD_CLOEXEC
996
above and must now close it manually here. */
997
closedir(dir);
998
}
999
if(p->environ[0] == NULL){
1000
if(execv(filename, p->argv) < 0){
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1003
}
1004
} else {
1005
if(execve(filename, p->argv, p->environ) < 0){
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1008
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
1009
1102
}
1010
1103
/* no return */
1011
1104
}
1012
1105
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
1015
free(filename);
1016
plugin *new_plugin = getplugin(dirst->d_name);
1106
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1017
1109
if(new_plugin == NULL){
1018
perror("getplugin");
1110
error(0, errno, "getplugin");
1019
1111
ret = (int)(TEMP_FAILURE_RETRY
1020
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
1113
NULL)));
1022
1114
if(ret < 0){
1023
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
1024
1116
}
1025
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
1026
1119
goto fallback;
1027
1120
}
1121
free(direntries[i]);
1028
1122
1029
1123
new_plugin->pid = pid;
1030
1124
new_plugin->fd = pipefd[0];
1031
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
1032
1131
/* Unblock SIGCHLD so signal handler can be run if this process
1033
1132
has already completed */
1034
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
1134
&sigchld_action.sa_mask,
1036
1135
NULL));
1037
1136
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
1040
1139
goto fallback;
1041
1140
}
1042
1141
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
1142
FD_SET(new_plugin->fd, &rfds_all);
1045
1143
1046
1144
if(maxfd < new_plugin->fd){
1047
1145
maxfd = new_plugin->fd;
1048
1146
}
1049
1147
}
1050
1148
1051
TEMP_FAILURE_RETRY(closedir(dir));
1052
dir = NULL;
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1053
1153
free_plugin(getplugin(NULL));
1054
1154
1055
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
1068
1168
fd_set rfds = rfds_all;
1069
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
1170
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
1073
1173
goto fallback;
1074
1174
}
1075
1175
/* OK, now either a process completed, or something can be read
1094
1194
(intmax_t) (proc->pid),
1095
1195
WTERMSIG(proc->status),
1096
1196
strsignal(WTERMSIG(proc->status)));
1097
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
1100
1197
}
1101
1198
}
1102
1199
1103
1200
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1201
FD_CLR(proc->fd, &rfds_all);
1106
1202
1107
1203
/* Block signal while modifying process_list */
1108
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
1206
&sigchld_action.sa_mask,
1111
1207
NULL));
1112
1208
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
1115
1211
goto fallback;
1116
1212
}
1117
1213
1124
1220
(sigprocmask(SIG_UNBLOCK,
1125
1221
&sigchld_action.sa_mask, NULL)));
1126
1222
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1129
1225
goto fallback;
1130
1226
}
1131
1227
1141
1237
bool bret = print_out_password(proc->buffer,
1142
1238
proc->buffer_length);
1143
1239
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
1146
1242
}
1147
1243
goto fallback;
1148
1244
}
1149
1245
1150
1246
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1248
/* This process had nothing to say at this time */
1155
1249
proc = proc->next;
1156
1250
continue;
1157
1251
}
1158
1252
/* Before reading, make the process' data buffer large enough */
1159
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1165
1259
goto fallback;
1166
1260
}
1261
proc->buffer = new_buffer;
1167
1262
proc->buffer_size += BUFFER_SIZE;
1168
1263
}
1169
1264
/* Read from the process */
1188
1283
1189
1284
fallback:
1190
1285
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1192
1288
/* Fallback if all plugins failed, none are found or an error
1193
1289
occured */
1194
1290
bool bret;
1202
1298
}
1203
1299
bret = print_out_password(passwordbuffer, len);
1204
1300
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1207
1303
}
1208
1304
}
1209
1305
1210
1306
/* Restore old signal handler */
1211
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
1308
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1215
1311
}
1216
1312
1217
1313
if(custom_argv != NULL){
1221
1317
free(custom_argv);
1222
1318
}
1223
1319
1224
if(dir != NULL){
1225
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1226
1324
}
1227
1325
1228
1326
/* Kill the processes */
1232
1330
ret = kill(p->pid, SIGTERM);
1233
1331
if(ret == -1 and errno != ESRCH){
1234
1332
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1333
error(0, errno, "kill");
1236
1334
}
1237
1335
}
1238
1336
}
1242
1340
ret = wait(NULL);
1243
1341
} while(ret >= 0);
1244
1342
if(errno != ECHILD){
1245
perror("wait");
1343
error(0, errno, "wait");
1246
1344
}
1247
1345
1248
1346
free_plugin_list();
1249
1347
1250
1348
free(plugindir);
1349
free(pluginhelperdir);
1251
1350
free(argfile);
1252
1351
1253
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0