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- Committer: teddy at recompile
- Date: 2020-02-09 03:42:50 UTC
- Revision ID: teddy@recompile.se-20200209034250-dxkkuq0eevnzk8py
Update formatting in TODO file
* TODO: Add markup, links and a file-wide tag.
* TODO: Add markup, links and a file-wide tag.
- 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_SUCCESS,
29
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,
70
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
73
75
74
76
#define BUFFER_SIZE 256
75
77
76
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
77
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
81
79
82
const char *argp_program_version = "plugin-runner " VERSION;
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
81
84
82
85
typedef struct plugin{
83
86
char *name; /* can be NULL or any plugin name */
103
106
104
107
/* Gets an existing plugin based on name,
105
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
106
110
static plugin *getplugin(char *name){
107
111
/* Check for existing plugin with that name */
108
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
169
173
}
170
174
171
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
172
177
static bool add_to_char_array(const char *new, char ***array,
173
178
int *len){
174
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
175
181
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} 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);
179
196
/* Malloc check */
180
if(*array == NULL){
197
if(new_array == NULL){
181
198
return false;
182
199
}
200
*array = new_array;
183
201
/* Make a copy of the new string */
184
202
char *copy;
185
203
do {
197
215
}
198
216
199
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
200
219
static bool add_argument(plugin *p, const char *arg){
201
220
if(p == NULL){
202
221
return false;
205
224
}
206
225
207
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
208
228
static bool add_environment(plugin *p, const char *def, bool replace){
209
229
if(p == NULL){
210
230
return false;
212
232
/* namelen = length of name of environment variable */
213
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
234
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
217
237
/* It already exists */
218
238
if(replace){
219
char *new;
239
char *new_envdef;
220
240
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
224
244
return false;
225
245
}
226
*e = new;
227
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
228
248
}
229
249
return true;
230
250
}
232
252
return add_to_char_array(def, &(p->environ), &(p->envc));
233
253
}
234
254
255
#ifndef O_CLOEXEC
235
256
/*
236
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
258
* Descriptor Flags".
238
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
239
260
*/
261
__attribute__((warn_unused_result))
240
262
static int set_cloexec_flag(int fd){
241
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
242
264
/* If reading the flags failed, return error indication now. */
247
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
270
ret | FD_CLOEXEC));
249
271
}
272
#endif /* not O_CLOEXEC */
250
273
251
274
252
275
/* Mark processes as completed when they exit, and save their exit
266
289
/* No child processes */
267
290
break;
268
291
}
269
perror("waitpid");
292
error(0, errno, "waitpid");
270
293
}
271
294
272
295
/* A child exited, find it in process_list */
284
307
}
285
308
286
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
287
311
static bool print_out_password(const char *buffer, size_t length){
288
312
ssize_t ret;
289
313
for(size_t written = 0; written < length; written += (size_t)ret){
297
321
}
298
322
299
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
300
325
static void free_plugin(plugin *plugin_node){
301
326
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
303
328
free(*arg);
304
329
}
330
free(plugin_node->name);
305
331
free(plugin_node->argv);
306
332
for(char **env = plugin_node->environ; *env != NULL; env++){
307
333
free(*env);
334
360
335
361
int main(int argc, char *argv[]){
336
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
337
364
char *argfile = NULL;
338
365
FILE *conffp;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
366
struct dirent **direntries = NULL;
342
367
struct stat st;
343
368
fd_set rfds_all;
344
369
int ret, maxfd = 0;
352
377
.sa_flags = SA_NOCLDSTOP };
353
378
char **custom_argv = NULL;
354
379
int custom_argc = 0;
380
int dir_fd = -1;
355
381
356
382
/* Establish a signal handler */
357
383
sigemptyset(&sigchld_action.sa_mask);
358
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
385
if(ret == -1){
360
perror("sigaddset");
386
error(0, errno, "sigaddset");
361
387
exitstatus = EX_OSERR;
362
388
goto fallback;
363
389
}
364
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
391
if(ret == -1){
366
perror("sigaction");
392
error(0, errno, "sigaction");
367
393
exitstatus = EX_OSERR;
368
394
goto fallback;
369
395
}
402
428
.doc = "Group ID the plugins will run as", .group = 3 },
403
429
{ .name = "debug", .key = 132,
404
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 },
405
435
/*
406
436
* These reproduce what we would get without ARGP_NO_HELP
407
437
*/
414
444
{ .name = NULL }
415
445
};
416
446
447
__attribute__((nonnull(3)))
417
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
449
errno = 0;
419
450
switch(key){
420
451
char *tmp;
421
intmax_t tmpmax;
452
intmax_t tmp_id;
422
453
case 'g': /* --global-options */
423
454
{
424
455
char *plugin_option;
427
458
break;
428
459
}
429
460
}
461
errno = 0;
430
462
}
431
463
break;
432
464
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
434
468
break;
435
469
case 'o': /* --options-for */
436
470
{
453
487
break;
454
488
}
455
489
}
490
errno = 0;
456
491
}
457
492
break;
458
493
case 'E': /* --env-for */
470
505
errno = EINVAL;
471
506
break;
472
507
}
473
add_environment(getplugin(arg), envdef, true);
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
474
511
}
475
512
break;
476
513
case 'd': /* --disable */
478
515
plugin *p = getplugin(arg);
479
516
if(p != NULL){
480
517
p->disabled = true;
518
errno = 0;
481
519
}
482
520
}
483
521
break;
486
524
plugin *p = getplugin(arg);
487
525
if(p != NULL){
488
526
p->disabled = false;
527
errno = 0;
489
528
}
490
529
}
491
530
break;
492
531
case 128: /* --plugin-dir */
493
532
free(plugindir);
494
533
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
495
537
break;
496
538
case 129: /* --config-file */
497
539
/* This is already done by parse_opt_config_file() */
498
540
break;
499
541
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
501
543
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
544
or tmp_id != (uid_t)tmp_id){
503
545
argp_error(state, "Bad user ID number: \"%s\", using %"
504
546
PRIdMAX, arg, (intmax_t)uid);
505
547
break;
506
548
}
507
uid = (uid_t)tmpmax;
549
uid = (uid_t)tmp_id;
550
errno = 0;
508
551
break;
509
552
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
553
tmp_id = strtoimax(arg, &tmp, 10);
511
554
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
555
or tmp_id != (gid_t)tmp_id){
513
556
argp_error(state, "Bad group ID number: \"%s\", using %"
514
557
PRIdMAX, arg, (intmax_t)gid);
515
558
break;
516
559
}
517
gid = (gid_t)tmpmax;
560
gid = (gid_t)tmp_id;
561
errno = 0;
518
562
break;
519
563
case 132: /* --debug */
520
564
debug = true;
521
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;
522
573
/*
523
574
* These reproduce what we would get without ARGP_NO_HELP
524
575
*/
525
576
case '?': /* --help */
526
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
528
580
case -3: /* --usage */
529
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
582
argp_state_help(state, state->out_stream,
531
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
532
585
case 'V': /* --version */
533
586
fprintf(state->out_stream, "%s\n", argp_program_version);
534
587
exit(EXIT_SUCCESS);
544
597
if(arg[0] == '\0'){
545
598
break;
546
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
547
605
default:
548
606
return ARGP_ERR_UNKNOWN;
549
607
}
568
626
case 129: /* --config-file */
569
627
free(argfile);
570
628
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
571
632
break;
572
633
case 130: /* --userid */
573
634
case 131: /* --groupid */
574
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
575
637
case '?': /* --help */
576
638
case -3: /* --usage */
577
639
case 'V': /* --version */
599
661
case ENOMEM:
600
662
default:
601
663
errno = ret;
602
perror("argp_parse");
664
error(0, errno, "argp_parse");
603
665
exitstatus = EX_OSERR;
604
666
goto fallback;
605
667
case EINVAL:
626
688
custom_argc = 1;
627
689
custom_argv = malloc(sizeof(char*) * 2);
628
690
if(custom_argv == NULL){
629
perror("malloc");
691
error(0, errno, "malloc");
630
692
exitstatus = EX_OSERR;
631
693
goto fallback;
632
694
}
649
711
}
650
712
new_arg = strdup(p);
651
713
if(new_arg == NULL){
652
perror("strdup");
714
error(0, errno, "strdup");
653
715
exitstatus = EX_OSERR;
654
716
free(org_line);
655
717
goto fallback;
656
718
}
657
719
658
720
custom_argc += 1;
659
custom_argv = realloc(custom_argv, sizeof(char *)
660
* ((unsigned int) custom_argc + 1));
661
if(custom_argv == NULL){
662
perror("realloc");
663
exitstatus = EX_OSERR;
664
free(org_line);
665
goto fallback;
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
}
666
744
}
667
745
custom_argv[custom_argc-1] = new_arg;
668
746
custom_argv[custom_argc] = NULL;
672
750
ret = fclose(conffp);
673
751
} while(ret == EOF and errno == EINTR);
674
752
if(ret == EOF){
675
perror("fclose");
753
error(0, errno, "fclose");
676
754
exitstatus = EX_IOERR;
677
755
goto fallback;
678
756
}
681
759
/* Check for harmful errors and go to fallback. Other errors might
682
760
not affect opening plugins */
683
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
762
error(0, errno, "fopen");
685
763
exitstatus = EX_OSERR;
686
764
goto fallback;
687
765
}
698
776
case ENOMEM:
699
777
default:
700
778
errno = ret;
701
perror("argp_parse");
779
error(0, errno, "argp_parse");
702
780
exitstatus = EX_OSERR;
703
781
goto fallback;
704
782
case EINVAL:
718
796
case ENOMEM:
719
797
default:
720
798
errno = ret;
721
perror("argp_parse");
799
error(0, errno, "argp_parse");
722
800
exitstatus = EX_OSERR;
723
801
goto fallback;
724
802
case EINVAL:
726
804
goto fallback;
727
805
}
728
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
729
825
if(debug){
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
731
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
732
828
p->name ? p->name : "Global", p->argc - 1);
733
829
for(char **a = p->argv; *a != NULL; a++){
740
836
}
741
837
}
742
838
743
/* Strip permissions down to nobody */
744
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);
745
865
if(ret == -1){
746
perror("setgid");
866
error(0, errno, "setgid");
747
867
}
748
868
ret = setuid(uid);
749
869
if(ret == -1){
750
perror("setuid");
870
error(0, errno, "setuid");
751
871
}
752
872
753
873
/* Open plugin directory with close_on_exec flag */
754
874
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
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
);
773
882
if(dir_fd == -1){
774
perror("Could not open plugin dir");
883
error(0, errno, "Could not open plugin dir");
775
884
exitstatus = EX_UNAVAILABLE;
776
885
goto fallback;
777
886
}
780
889
/* Set the FD_CLOEXEC flag on the directory */
781
890
ret = set_cloexec_flag(dir_fd);
782
891
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
892
error(0, errno, "set_cloexec_flag");
785
893
exitstatus = EX_OSERR;
786
894
goto fallback;
787
895
}
788
896
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
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
}
796
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;
797
931
}
798
932
799
933
FD_ZERO(&rfds_all);
800
934
801
935
/* Read and execute any executable in the plugin directory*/
802
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
806
807
/* All directory entries have been processed */
808
if(dirst == NULL){
809
if(errno == EBADF){
810
perror("readdir");
811
exitstatus = EX_IOERR;
812
goto fallback;
813
}
814
break;
815
}
816
817
d_name_len = strlen(dirst->d_name);
818
819
/* Ignore dotfiles, backup files and other junk */
820
{
821
bool bad_name = false;
822
823
const char const *bad_prefixes[] = { ".", "#", NULL };
824
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
".dpkg-old",
827
".dpkg-bak",
828
".dpkg-divert", NULL };
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
size_t pre_len = strlen(*pre);
831
if((d_name_len >= pre_len)
832
and strncmp((dirst->d_name), *pre, pre_len) == 0){
833
if(debug){
834
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
835
" with bad prefix %s\n", dirst->d_name, *pre);
836
}
837
bad_name = true;
838
break;
839
}
840
}
841
if(bad_name){
842
continue;
843
}
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
size_t suf_len = strlen(*suf);
846
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
== 0)){
849
if(debug){
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
851
" with bad suffix %s\n", dirst->d_name, *suf);
852
}
853
bad_name = true;
854
break;
855
}
856
}
857
858
if(bad_name){
859
continue;
860
}
861
}
862
863
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
872
if(ret < 0){
873
perror("asprintf");
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]);
874
942
continue;
875
943
}
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
878
945
if(ret == -1){
879
perror("stat");
880
free(filename);
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
881
949
continue;
882
950
}
883
951
884
952
/* Ignore non-executable files */
885
953
if(not S_ISREG(st.st_mode)
886
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)){
887
956
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" 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);
890
961
}
891
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
892
964
continue;
893
965
}
894
966
895
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
896
968
if(p == NULL){
897
perror("getplugin");
898
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
899
972
continue;
900
973
}
901
974
if(p->disabled){
902
975
if(debug){
903
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
904
dirst->d_name);
977
direntries[i]->d_name);
905
978
}
906
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
907
981
continue;
908
982
}
909
983
{
912
986
if(g != NULL){
913
987
for(char **a = g->argv + 1; *a != NULL; a++){
914
988
if(not add_argument(p, *a)){
915
perror("add_argument");
989
error(0, errno, "add_argument");
916
990
}
917
991
}
918
992
/* Add global environment variables */
919
993
for(char **e = g->environ; *e != NULL; e++){
920
994
if(not add_environment(p, *e, false)){
921
perror("add_environment");
995
error(0, errno, "add_environment");
922
996
}
923
997
}
924
998
}
925
999
}
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
928
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
929
1002
if(p->environ[0] != NULL){
930
1003
for(char **e = environ; *e != NULL; e++){
931
1004
if(not add_environment(p, *e, false)){
932
perror("add_environment");
1005
error(0, errno, "add_environment");
933
1006
}
934
1007
}
935
1008
}
936
1009
937
1010
int pipefd[2];
1011
#ifndef O_CLOEXEC
938
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 */
939
1016
if(ret == -1){
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
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
944
1032
/* Ask OS to automatic close the pipe on exec */
945
1033
ret = set_cloexec_flag(pipefd[0]);
946
1034
if(ret < 0){
947
perror("set_cloexec_flag");
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
948
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
949
1040
goto fallback;
950
1041
}
951
1042
ret = set_cloexec_flag(pipefd[1]);
952
1043
if(ret < 0){
953
perror("set_cloexec_flag");
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
954
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
955
1049
goto fallback;
956
1050
}
1051
#endif /* not O_CLOEXEC */
957
1052
/* Block SIGCHLD until process is safely in process list */
958
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
1054
&sigchld_action.sa_mask,
960
1055
NULL));
961
1056
if(ret < 0){
962
perror("sigprocmask");
1057
error(0, errno, "sigprocmask");
963
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
964
1060
goto fallback;
965
1061
}
966
1062
/* Starting a new process to be watched */
969
1065
pid = fork();
970
1066
} while(pid == -1 and errno == EINTR);
971
1067
if(pid == -1){
972
perror("fork");
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]);
973
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
974
1075
goto fallback;
975
1076
}
976
1077
if(pid == 0){
977
1078
/* this is the child process */
978
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
1080
if(ret < 0){
980
perror("sigaction");
1081
error(0, errno, "sigaction");
981
1082
_exit(EX_OSERR);
982
1083
}
983
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
1085
if(ret < 0){
985
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
986
1087
_exit(EX_OSERR);
987
1088
}
988
1089
989
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
1091
if(ret == -1){
991
perror("dup2");
1092
error(0, errno, "dup2");
992
1093
_exit(EX_OSERR);
993
1094
}
994
1095
995
if(dirfd(dir) < 0){
996
/* If dir has no file descriptor, we could not set FD_CLOEXEC
997
above and must now close it manually here. */
998
closedir(dir);
999
}
1000
if(p->environ[0] == NULL){
1001
if(execv(filename, p->argv) < 0){
1002
perror("execv");
1003
_exit(EX_OSERR);
1004
}
1005
} else {
1006
if(execve(filename, p->argv, p->environ) < 0){
1007
perror("execve");
1008
_exit(EX_OSERR);
1009
}
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);
1010
1102
}
1011
1103
/* no return */
1012
1104
}
1013
1105
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
1016
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1106
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1018
1109
if(new_plugin == NULL){
1019
perror("getplugin");
1110
error(0, errno, "getplugin");
1020
1111
ret = (int)(TEMP_FAILURE_RETRY
1021
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
1113
NULL)));
1023
1114
if(ret < 0){
1024
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
1025
1116
}
1026
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
1027
1119
goto fallback;
1028
1120
}
1121
free(direntries[i]);
1029
1122
1030
1123
new_plugin->pid = pid;
1031
1124
new_plugin->fd = pipefd[0];
1032
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
1033
1131
/* Unblock SIGCHLD so signal handler can be run if this process
1034
1132
has already completed */
1035
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
1134
&sigchld_action.sa_mask,
1037
1135
NULL));
1038
1136
if(ret < 0){
1039
perror("sigprocmask");
1137
error(0, errno, "sigprocmask");
1040
1138
exitstatus = EX_OSERR;
1041
1139
goto fallback;
1042
1140
}
1043
1141
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1142
FD_SET(new_plugin->fd, &rfds_all);
1046
1143
1047
1144
if(maxfd < new_plugin->fd){
1048
1145
maxfd = new_plugin->fd;
1049
1146
}
1050
1147
}
1051
1148
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1054
1153
free_plugin(getplugin(NULL));
1055
1154
1056
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
1168
fd_set rfds = rfds_all;
1070
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
1170
if(select_ret == -1 and errno != EINTR){
1072
perror("select");
1171
error(0, errno, "select");
1073
1172
exitstatus = EX_OSERR;
1074
1173
goto fallback;
1075
1174
}
1095
1194
(intmax_t) (proc->pid),
1096
1195
WTERMSIG(proc->status),
1097
1196
strsignal(WTERMSIG(proc->status)));
1098
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
1101
1197
}
1102
1198
}
1103
1199
1104
1200
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1201
FD_CLR(proc->fd, &rfds_all);
1107
1202
1108
1203
/* Block signal while modifying process_list */
1109
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
1206
&sigchld_action.sa_mask,
1112
1207
NULL));
1113
1208
if(ret < 0){
1114
perror("sigprocmask");
1209
error(0, errno, "sigprocmask");
1115
1210
exitstatus = EX_OSERR;
1116
1211
goto fallback;
1117
1212
}
1125
1220
(sigprocmask(SIG_UNBLOCK,
1126
1221
&sigchld_action.sa_mask, NULL)));
1127
1222
if(ret < 0){
1128
perror("sigprocmask");
1223
error(0, errno, "sigprocmask");
1129
1224
exitstatus = EX_OSERR;
1130
1225
goto fallback;
1131
1226
}
1142
1237
bool bret = print_out_password(proc->buffer,
1143
1238
proc->buffer_length);
1144
1239
if(not bret){
1145
perror("print_out_password");
1240
error(0, errno, "print_out_password");
1146
1241
exitstatus = EX_IOERR;
1147
1242
}
1148
1243
goto fallback;
1149
1244
}
1150
1245
1151
1246
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1248
/* This process had nothing to say at this time */
1156
1249
proc = proc->next;
1157
1250
continue;
1158
1251
}
1159
1252
/* Before reading, make the process' data buffer large enough */
1160
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
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");
1165
1258
exitstatus = EX_OSERR;
1166
1259
goto fallback;
1167
1260
}
1261
proc->buffer = new_buffer;
1168
1262
proc->buffer_size += BUFFER_SIZE;
1169
1263
}
1170
1264
/* Read from the process */
1204
1298
}
1205
1299
bret = print_out_password(passwordbuffer, len);
1206
1300
if(not bret){
1207
perror("print_out_password");
1301
error(0, errno, "print_out_password");
1208
1302
exitstatus = EX_IOERR;
1209
1303
}
1210
1304
}
1212
1306
/* Restore old signal handler */
1213
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1308
if(ret == -1){
1215
perror("sigaction");
1309
error(0, errno, "sigaction");
1216
1310
exitstatus = EX_OSERR;
1217
1311
}
1218
1312
1223
1317
free(custom_argv);
1224
1318
}
1225
1319
1226
if(dir != NULL){
1227
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1228
1324
}
1229
1325
1230
1326
/* Kill the processes */
1234
1330
ret = kill(p->pid, SIGTERM);
1235
1331
if(ret == -1 and errno != ESRCH){
1236
1332
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1333
error(0, errno, "kill");
1238
1334
}
1239
1335
}
1240
1336
}
1244
1340
ret = wait(NULL);
1245
1341
} while(ret >= 0);
1246
1342
if(errno != ECHILD){
1247
perror("wait");
1343
error(0, errno, "wait");
1248
1344
}
1249
1345
1250
1346
free_plugin_list();
1251
1347
1252
1348
free(plugindir);
1349
free(pluginhelperdir);
1253
1350
free(argfile);
1254
1351
1255
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0