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- Committer: Teddy Hogeborn
- Date: 2024-09-12 18:31:12 UTC
- mfrom: (411 release)
- mto: This revision was merged to the branch mainline in revision 412.
- Revision ID: teddy@recompile.se-20240912183112-xxy0akg67c0ky0t8
Merge from release branch
- 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 © 2008-2022 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_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#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() */
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() */
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() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
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 */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
72
89
73
90
#define BUFFER_SIZE 256
74
91
75
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
76
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
95
78
96
const char *argp_program_version = "plugin-runner " VERSION;
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
98
81
99
typedef struct plugin{
82
100
char *name; /* can be NULL or any plugin name */
102
120
103
121
/* Gets an existing plugin based on name,
104
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
105
124
static plugin *getplugin(char *name){
106
125
/* Check for existing plugin with that name */
107
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
168
187
}
169
188
170
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
171
191
static bool add_to_char_array(const char *new, char ***array,
172
192
int *len){
173
193
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
174
195
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} 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);
178
210
/* Malloc check */
179
if(*array == NULL){
211
if(new_array == NULL){
180
212
return false;
181
213
}
214
*array = new_array;
182
215
/* Make a copy of the new string */
183
216
char *copy;
184
217
do {
196
229
}
197
230
198
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
199
233
static bool add_argument(plugin *p, const char *arg){
200
234
if(p == NULL){
201
235
return false;
204
238
}
205
239
206
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
207
242
static bool add_environment(plugin *p, const char *def, bool replace){
208
243
if(p == NULL){
209
244
return false;
211
246
/* namelen = length of name of environment variable */
212
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
248
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
216
251
/* It already exists */
217
252
if(replace){
218
char *new;
253
char *new_envdef;
219
254
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
222
if(new == NULL){
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
223
258
return false;
224
259
}
225
*e = new;
226
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
227
262
}
228
263
return true;
229
264
}
231
266
return add_to_char_array(def, &(p->environ), &(p->envc));
232
267
}
233
268
269
#ifndef O_CLOEXEC
234
270
/*
235
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
272
* Descriptor Flags".
237
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
238
274
*/
275
__attribute__((warn_unused_result))
239
276
static int set_cloexec_flag(int fd){
240
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
241
278
/* If reading the flags failed, return error indication now. */
246
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
284
ret | FD_CLOEXEC));
248
285
}
286
#endif /* not O_CLOEXEC */
249
287
250
288
251
289
/* Mark processes as completed when they exit, and save their exit
265
303
/* No child processes */
266
304
break;
267
305
}
268
perror("waitpid");
306
error(0, errno, "waitpid");
269
307
}
270
308
271
309
/* A child exited, find it in process_list */
283
321
}
284
322
285
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
286
325
static bool print_out_password(const char *buffer, size_t length){
287
326
ssize_t ret;
288
327
for(size_t written = 0; written < length; written += (size_t)ret){
296
335
}
297
336
298
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
299
339
static void free_plugin(plugin *plugin_node){
300
340
301
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
302
342
free(*arg);
303
343
}
344
free(plugin_node->name);
304
345
free(plugin_node->argv);
305
346
for(char **env = plugin_node->environ; *env != NULL; env++){
306
347
free(*env);
333
374
334
375
int main(int argc, char *argv[]){
335
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
336
378
char *argfile = NULL;
337
379
FILE *conffp;
338
size_t d_name_len;
339
DIR *dir = NULL;
340
struct dirent *dirst;
380
struct dirent **direntries = NULL;
341
381
struct stat st;
342
382
fd_set rfds_all;
343
383
int ret, maxfd = 0;
351
391
.sa_flags = SA_NOCLDSTOP };
352
392
char **custom_argv = NULL;
353
393
int custom_argc = 0;
394
int dir_fd = -1;
354
395
355
396
/* Establish a signal handler */
356
397
sigemptyset(&sigchld_action.sa_mask);
357
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
399
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
361
402
goto fallback;
362
403
}
363
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
405
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
367
408
goto fallback;
368
409
}
369
410
401
442
.doc = "Group ID the plugins will run as", .group = 3 },
402
443
{ .name = "debug", .key = 132,
403
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 },
404
449
/*
405
450
* These reproduce what we would get without ARGP_NO_HELP
406
451
*/
413
458
{ .name = NULL }
414
459
};
415
460
461
__attribute__((nonnull(3)))
416
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
463
errno = 0;
418
464
switch(key){
419
465
char *tmp;
420
intmax_t tmpmax;
466
intmax_t tmp_id;
421
467
case 'g': /* --global-options */
422
468
{
423
469
char *plugin_option;
426
472
break;
427
473
}
428
474
}
475
errno = 0;
429
476
}
430
477
break;
431
478
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
433
482
break;
434
483
case 'o': /* --options-for */
435
484
{
452
501
break;
453
502
}
454
503
}
504
errno = 0;
455
505
}
456
506
break;
457
507
case 'E': /* --env-for */
469
519
errno = EINVAL;
470
520
break;
471
521
}
472
add_environment(getplugin(arg), envdef, true);
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
473
525
}
474
526
break;
475
527
case 'd': /* --disable */
477
529
plugin *p = getplugin(arg);
478
530
if(p != NULL){
479
531
p->disabled = true;
532
errno = 0;
480
533
}
481
534
}
482
535
break;
485
538
plugin *p = getplugin(arg);
486
539
if(p != NULL){
487
540
p->disabled = false;
541
errno = 0;
488
542
}
489
543
}
490
544
break;
491
545
case 128: /* --plugin-dir */
492
546
free(plugindir);
493
547
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
494
551
break;
495
552
case 129: /* --config-file */
496
553
/* This is already done by parse_opt_config_file() */
497
554
break;
498
555
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
556
tmp_id = strtoimax(arg, &tmp, 10);
500
557
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
558
or tmp_id != (uid_t)tmp_id){
502
559
argp_error(state, "Bad user ID number: \"%s\", using %"
503
560
PRIdMAX, arg, (intmax_t)uid);
504
561
break;
505
562
}
506
uid = (uid_t)tmpmax;
563
uid = (uid_t)tmp_id;
564
errno = 0;
507
565
break;
508
566
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
567
tmp_id = strtoimax(arg, &tmp, 10);
510
568
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
569
or tmp_id != (gid_t)tmp_id){
512
570
argp_error(state, "Bad group ID number: \"%s\", using %"
513
571
PRIdMAX, arg, (intmax_t)gid);
514
572
break;
515
573
}
516
gid = (gid_t)tmpmax;
574
gid = (gid_t)tmp_id;
575
errno = 0;
517
576
break;
518
577
case 132: /* --debug */
519
578
debug = true;
520
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;
521
587
/*
522
588
* These reproduce what we would get without ARGP_NO_HELP
523
589
*/
524
590
case '?': /* --help */
525
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
527
594
case -3: /* --usage */
528
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
596
argp_state_help(state, state->out_stream,
530
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
531
599
case 'V': /* --version */
532
600
fprintf(state->out_stream, "%s\n", argp_program_version);
533
601
exit(EXIT_SUCCESS);
543
611
if(arg[0] == '\0'){
544
612
break;
545
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
546
619
default:
547
620
return ARGP_ERR_UNKNOWN;
548
621
}
567
640
case 129: /* --config-file */
568
641
free(argfile);
569
642
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
570
646
break;
571
647
case 130: /* --userid */
572
648
case 131: /* --groupid */
573
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
574
651
case '?': /* --help */
575
652
case -3: /* --usage */
576
653
case 'V': /* --version */
598
675
case ENOMEM:
599
676
default:
600
677
errno = ret;
601
perror("argp_parse");
678
error(0, errno, "argp_parse");
602
679
exitstatus = EX_OSERR;
603
680
goto fallback;
604
681
case EINVAL:
625
702
custom_argc = 1;
626
703
custom_argv = malloc(sizeof(char*) * 2);
627
704
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
630
707
goto fallback;
631
708
}
632
709
custom_argv[0] = argv[0];
648
725
}
649
726
new_arg = strdup(p);
650
727
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
653
730
free(org_line);
654
731
goto fallback;
655
732
}
656
733
657
734
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;
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
}
665
759
}
666
760
custom_argv[custom_argc-1] = new_arg;
667
761
custom_argv[custom_argc] = NULL;
671
765
ret = fclose(conffp);
672
766
} while(ret == EOF and errno == EINTR);
673
767
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
676
770
goto fallback;
677
771
}
678
772
free(org_line);
680
774
/* Check for harmful errors and go to fallback. Other errors might
681
775
not affect opening plugins */
682
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
685
779
goto fallback;
686
780
}
687
781
}
697
791
case ENOMEM:
698
792
default:
699
793
errno = ret;
700
perror("argp_parse");
794
error(0, errno, "argp_parse");
701
795
exitstatus = EX_OSERR;
702
796
goto fallback;
703
797
case EINVAL:
717
811
case ENOMEM:
718
812
default:
719
813
errno = ret;
720
perror("argp_parse");
814
error(0, errno, "argp_parse");
721
815
exitstatus = EX_OSERR;
722
816
goto fallback;
723
817
case EINVAL:
725
819
goto fallback;
726
820
}
727
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
728
840
if(debug){
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
730
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
731
843
p->name ? p->name : "Global", p->argc - 1);
732
844
for(char **a = p->argv; *a != NULL; a++){
739
851
}
740
852
}
741
853
742
/* Strip permissions down to nobody */
743
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);
744
889
if(ret == -1){
745
perror("setgid");
890
error(0, errno, "setgid");
746
891
}
747
892
ret = setuid(uid);
748
893
if(ret == -1){
749
perror("setuid");
894
error(0, errno, "setuid");
750
895
}
751
896
752
897
/* Open plugin directory with close_on_exec flag */
753
898
{
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
}
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
);
772
906
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
775
909
goto fallback;
776
910
}
777
911
779
913
/* Set the FD_CLOEXEC flag on the directory */
780
914
ret = set_cloexec_flag(dir_fd);
781
915
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
785
918
goto fallback;
786
919
}
787
920
#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;
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
}
795
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;
796
955
}
797
956
798
957
FD_ZERO(&rfds_all);
799
958
800
959
/* 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");
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]);
873
966
continue;
874
967
}
875
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
877
969
if(ret == -1){
878
perror("stat");
879
free(filename);
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
880
973
continue;
881
974
}
882
975
883
976
/* Ignore non-executable files */
884
977
if(not S_ISREG(st.st_mode)
885
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)){
886
980
if(debug){
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
" 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);
889
985
}
890
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
891
988
continue;
892
989
}
893
990
894
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
895
992
if(p == NULL){
896
perror("getplugin");
897
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
898
996
continue;
899
997
}
900
998
if(p->disabled){
901
999
if(debug){
902
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
903
dirst->d_name);
1001
direntries[i]->d_name);
904
1002
}
905
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
906
1005
continue;
907
1006
}
908
1007
{
911
1010
if(g != NULL){
912
1011
for(char **a = g->argv + 1; *a != NULL; a++){
913
1012
if(not add_argument(p, *a)){
914
perror("add_argument");
1013
error(0, errno, "add_argument");
915
1014
}
916
1015
}
917
1016
/* Add global environment variables */
918
1017
for(char **e = g->environ; *e != NULL; e++){
919
1018
if(not add_environment(p, *e, false)){
920
perror("add_environment");
1019
error(0, errno, "add_environment");
921
1020
}
922
1021
}
923
1022
}
924
1023
}
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. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
928
1026
if(p->environ[0] != NULL){
929
1027
for(char **e = environ; *e != NULL; e++){
930
1028
if(not add_environment(p, *e, false)){
931
perror("add_environment");
1029
error(0, errno, "add_environment");
932
1030
}
933
1031
}
934
1032
}
935
1033
936
1034
int pipefd[2];
1035
#ifndef O_CLOEXEC
937
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 */
938
1040
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
941
goto fallback;
942
}
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
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
943
1056
/* Ask OS to automatic close the pipe on exec */
944
1057
ret = set_cloexec_flag(pipefd[0]);
945
1058
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
948
1064
goto fallback;
949
1065
}
950
1066
ret = set_cloexec_flag(pipefd[1]);
951
1067
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
954
1073
goto fallback;
955
1074
}
1075
#endif /* not O_CLOEXEC */
956
1076
/* Block SIGCHLD until process is safely in process list */
957
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
1078
&sigchld_action.sa_mask,
959
1079
NULL));
960
1080
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
963
1084
goto fallback;
964
1085
}
965
1086
/* Starting a new process to be watched */
968
1089
pid = fork();
969
1090
} while(pid == -1 and errno == EINTR);
970
1091
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
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]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
973
1099
goto fallback;
974
1100
}
975
1101
if(pid == 0){
976
1102
/* this is the child process */
977
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
1104
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
981
1107
}
982
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
1109
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
986
1112
}
987
1113
988
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
1115
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
992
1118
}
993
1119
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
}
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);
1009
1126
}
1010
1127
/* no return */
1011
1128
}
1012
1129
/* 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);
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1017
1133
if(new_plugin == NULL){
1018
perror("getplugin");
1134
error(0, errno, "getplugin");
1019
1135
ret = (int)(TEMP_FAILURE_RETRY
1020
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
1137
NULL)));
1022
1138
if(ret < 0){
1023
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
1024
1140
}
1025
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
1026
1143
goto fallback;
1027
1144
}
1145
free(direntries[i]);
1028
1146
1029
1147
new_plugin->pid = pid;
1030
1148
new_plugin->fd = pipefd[0];
1031
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
1032
1155
/* Unblock SIGCHLD so signal handler can be run if this process
1033
1156
has already completed */
1034
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
1158
&sigchld_action.sa_mask,
1036
1159
NULL));
1037
1160
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
1040
1163
goto fallback;
1041
1164
}
1042
1165
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
1166
FD_SET(new_plugin->fd, &rfds_all);
1045
1167
1046
1168
if(maxfd < new_plugin->fd){
1047
1169
maxfd = new_plugin->fd;
1048
1170
}
1049
1171
}
1050
1172
1051
TEMP_FAILURE_RETRY(closedir(dir));
1052
dir = NULL;
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1053
1177
free_plugin(getplugin(NULL));
1054
1178
1055
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
1068
1192
fd_set rfds = rfds_all;
1069
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
1194
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
1073
1197
goto fallback;
1074
1198
}
1075
1199
/* OK, now either a process completed, or something can be read
1094
1218
(intmax_t) (proc->pid),
1095
1219
WTERMSIG(proc->status),
1096
1220
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
1221
}
1101
1222
}
1102
1223
1103
1224
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1225
FD_CLR(proc->fd, &rfds_all);
1106
1226
1107
1227
/* Block signal while modifying process_list */
1108
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
1230
&sigchld_action.sa_mask,
1111
1231
NULL));
1112
1232
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
1115
1235
goto fallback;
1116
1236
}
1117
1237
1124
1244
(sigprocmask(SIG_UNBLOCK,
1125
1245
&sigchld_action.sa_mask, NULL)));
1126
1246
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1129
1249
goto fallback;
1130
1250
}
1131
1251
1141
1261
bool bret = print_out_password(proc->buffer,
1142
1262
proc->buffer_length);
1143
1263
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
1146
1266
}
1147
1267
goto fallback;
1148
1268
}
1149
1269
1150
1270
/* 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 */
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1272
/* This process had nothing to say at this time */
1155
1273
proc = proc->next;
1156
1274
continue;
1157
1275
}
1158
1276
/* Before reading, make the process' data buffer large enough */
1159
1277
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;
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
1165
1283
goto fallback;
1166
1284
}
1285
proc->buffer = new_buffer;
1167
1286
proc->buffer_size += BUFFER_SIZE;
1168
1287
}
1169
1288
/* Read from the process */
1188
1307
1189
1308
fallback:
1190
1309
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1192
1312
/* Fallback if all plugins failed, none are found or an error
1193
1313
occured */
1194
1314
bool bret;
1202
1322
}
1203
1323
bret = print_out_password(passwordbuffer, len);
1204
1324
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1207
1327
}
1208
1328
}
1209
1329
1210
1330
/* Restore old signal handler */
1211
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
1332
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1215
1335
}
1216
1336
1217
1337
if(custom_argv != NULL){
1221
1341
free(custom_argv);
1222
1342
}
1223
1343
1224
if(dir != NULL){
1225
closedir(dir);
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1226
1348
}
1227
1349
1228
1350
/* Kill the processes */
1232
1354
ret = kill(p->pid, SIGTERM);
1233
1355
if(ret == -1 and errno != ESRCH){
1234
1356
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1357
error(0, errno, "kill");
1236
1358
}
1237
1359
}
1238
1360
}
1242
1364
ret = wait(NULL);
1243
1365
} while(ret >= 0);
1244
1366
if(errno != ECHILD){
1245
perror("wait");
1367
error(0, errno, "wait");
1246
1368
}
1247
1369
1248
1370
free_plugin_list();
1249
1371
1250
1372
free(plugindir);
1373
free(pluginhelperdir);
1251
1374
free(argfile);
1252
1375
1253
1376
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0