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- Committer: teddy at bsnet
- Date: 2010-09-08 19:25:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20100908192513-ccso0jpam3qg4yze
* TODO: Clarifications.
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
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
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
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() */
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
42
27
#include <stddef.h> /* size_t, NULL */
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() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
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() */
63
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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 */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
84
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
72
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 */
89
73
90
74
#define BUFFER_SIZE 256
91
75
92
76
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
78
96
79
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
98
81
99
82
typedef struct plugin{
100
83
char *name; /* can be NULL or any plugin name */
120
103
121
104
/* Gets an existing plugin based on name,
122
105
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
106
static plugin *getplugin(char *name){
125
107
/* Check for existing plugin with that name */
126
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
187
169
}
188
170
189
171
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
191
172
static bool add_to_char_array(const char *new, char ***array,
192
173
int *len){
193
174
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
195
175
do {
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);
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
210
179
/* Malloc check */
211
if(new_array == NULL){
180
if(*array == NULL){
212
181
return false;
213
182
}
214
*array = new_array;
215
183
/* Make a copy of the new string */
216
184
char *copy;
217
185
do {
229
197
}
230
198
231
199
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
200
static bool add_argument(plugin *p, const char *arg){
234
201
if(p == NULL){
235
202
return false;
238
205
}
239
206
240
207
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
242
208
static bool add_environment(plugin *p, const char *def, bool replace){
243
209
if(p == NULL){
244
210
return false;
246
212
/* namelen = length of name of environment variable */
247
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
214
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
251
217
/* It already exists */
252
218
if(replace){
253
char *new_envdef;
219
char *new;
254
220
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
258
224
return false;
259
225
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
226
*e = new;
227
strcpy(*e, def);
262
228
}
263
229
return true;
264
230
}
266
232
return add_to_char_array(def, &(p->environ), &(p->envc));
267
233
}
268
234
269
#ifndef O_CLOEXEC
270
235
/*
271
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
237
* Descriptor Flags".
273
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
274
239
*/
275
__attribute__((warn_unused_result))
276
240
static int set_cloexec_flag(int fd){
277
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
278
242
/* If reading the flags failed, return error indication now. */
283
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
248
ret | FD_CLOEXEC));
285
249
}
286
#endif /* not O_CLOEXEC */
287
250
288
251
289
252
/* Mark processes as completed when they exit, and save their exit
303
266
/* No child processes */
304
267
break;
305
268
}
306
error(0, errno, "waitpid");
269
perror("waitpid");
307
270
}
308
271
309
272
/* A child exited, find it in process_list */
321
284
}
322
285
323
286
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
287
static bool print_out_password(const char *buffer, size_t length){
326
288
ssize_t ret;
327
289
for(size_t written = 0; written < length; written += (size_t)ret){
335
297
}
336
298
337
299
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
300
static void free_plugin(plugin *plugin_node){
340
301
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
303
free(*arg);
343
304
}
344
free(plugin_node->name);
345
305
free(plugin_node->argv);
346
306
for(char **env = plugin_node->environ; *env != NULL; env++){
347
307
free(*env);
374
334
375
335
int main(int argc, char *argv[]){
376
336
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
337
char *argfile = NULL;
379
338
FILE *conffp;
380
struct dirent **direntries = NULL;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
381
342
struct stat st;
382
343
fd_set rfds_all;
383
344
int ret, maxfd = 0;
391
352
.sa_flags = SA_NOCLDSTOP };
392
353
char **custom_argv = NULL;
393
354
int custom_argc = 0;
394
int dir_fd = -1;
395
355
396
356
/* Establish a signal handler */
397
357
sigemptyset(&sigchld_action.sa_mask);
398
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
399
359
if(ret == -1){
400
error(0, errno, "sigaddset");
360
perror("sigaddset");
401
361
exitstatus = EX_OSERR;
402
362
goto fallback;
403
363
}
404
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
405
365
if(ret == -1){
406
error(0, errno, "sigaction");
366
perror("sigaction");
407
367
exitstatus = EX_OSERR;
408
368
goto fallback;
409
369
}
442
402
.doc = "Group ID the plugins will run as", .group = 3 },
443
403
{ .name = "debug", .key = 132,
444
404
.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 },
449
405
/*
450
406
* These reproduce what we would get without ARGP_NO_HELP
451
407
*/
458
414
{ .name = NULL }
459
415
};
460
416
461
__attribute__((nonnull(3)))
462
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
418
errno = 0;
464
419
switch(key){
465
420
char *tmp;
466
intmax_t tmp_id;
421
intmax_t tmpmax;
467
422
case 'g': /* --global-options */
468
423
{
469
424
char *plugin_option;
472
427
break;
473
428
}
474
429
}
475
errno = 0;
476
430
}
477
431
break;
478
432
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
433
add_environment(getplugin(NULL), arg, true);
482
434
break;
483
435
case 'o': /* --options-for */
484
436
{
501
453
break;
502
454
}
503
455
}
504
errno = 0;
505
456
}
506
457
break;
507
458
case 'E': /* --env-for */
519
470
errno = EINVAL;
520
471
break;
521
472
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
473
add_environment(getplugin(arg), envdef, true);
525
474
}
526
475
break;
527
476
case 'd': /* --disable */
529
478
plugin *p = getplugin(arg);
530
479
if(p != NULL){
531
480
p->disabled = true;
532
errno = 0;
533
481
}
534
482
}
535
483
break;
538
486
plugin *p = getplugin(arg);
539
487
if(p != NULL){
540
488
p->disabled = false;
541
errno = 0;
542
489
}
543
490
}
544
491
break;
545
492
case 128: /* --plugin-dir */
546
493
free(plugindir);
547
494
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
551
495
break;
552
496
case 129: /* --config-file */
553
497
/* This is already done by parse_opt_config_file() */
554
498
break;
555
499
case 130: /* --userid */
556
tmp_id = strtoimax(arg, &tmp, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
557
501
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
502
or tmpmax != (uid_t)tmpmax){
559
503
argp_error(state, "Bad user ID number: \"%s\", using %"
560
504
PRIdMAX, arg, (intmax_t)uid);
561
505
break;
562
506
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
507
uid = (uid_t)tmpmax;
565
508
break;
566
509
case 131: /* --groupid */
567
tmp_id = strtoimax(arg, &tmp, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
568
511
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
512
or tmpmax != (gid_t)tmpmax){
570
513
argp_error(state, "Bad group ID number: \"%s\", using %"
571
514
PRIdMAX, arg, (intmax_t)gid);
572
515
break;
573
516
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
517
gid = (gid_t)tmpmax;
576
518
break;
577
519
case 132: /* --debug */
578
520
debug = true;
579
521
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
522
/*
588
523
* These reproduce what we would get without ARGP_NO_HELP
589
524
*/
590
525
case '?': /* --help */
591
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
528
case -3: /* --usage */
595
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
530
argp_state_help(state, state->out_stream,
597
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
532
case 'V': /* --version */
600
533
fprintf(state->out_stream, "%s\n", argp_program_version);
601
534
exit(EXIT_SUCCESS);
611
544
if(arg[0] == '\0'){
612
545
break;
613
546
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
619
547
default:
620
548
return ARGP_ERR_UNKNOWN;
621
549
}
640
568
case 129: /* --config-file */
641
569
free(argfile);
642
570
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
646
571
break;
647
572
case 130: /* --userid */
648
573
case 131: /* --groupid */
649
574
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
575
case '?': /* --help */
652
576
case -3: /* --usage */
653
577
case 'V': /* --version */
675
599
case ENOMEM:
676
600
default:
677
601
errno = ret;
678
error(0, errno, "argp_parse");
602
perror("argp_parse");
679
603
exitstatus = EX_OSERR;
680
604
goto fallback;
681
605
case EINVAL:
702
626
custom_argc = 1;
703
627
custom_argv = malloc(sizeof(char*) * 2);
704
628
if(custom_argv == NULL){
705
error(0, errno, "malloc");
629
perror("malloc");
706
630
exitstatus = EX_OSERR;
707
631
goto fallback;
708
632
}
725
649
}
726
650
new_arg = strdup(p);
727
651
if(new_arg == NULL){
728
error(0, errno, "strdup");
652
perror("strdup");
729
653
exitstatus = EX_OSERR;
730
654
free(org_line);
731
655
goto fallback;
732
656
}
733
657
734
658
custom_argc += 1;
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
}
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;
759
666
}
760
667
custom_argv[custom_argc-1] = new_arg;
761
668
custom_argv[custom_argc] = NULL;
765
672
ret = fclose(conffp);
766
673
} while(ret == EOF and errno == EINTR);
767
674
if(ret == EOF){
768
error(0, errno, "fclose");
675
perror("fclose");
769
676
exitstatus = EX_IOERR;
770
677
goto fallback;
771
678
}
774
681
/* Check for harmful errors and go to fallback. Other errors might
775
682
not affect opening plugins */
776
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
684
perror("fopen");
778
685
exitstatus = EX_OSERR;
779
686
goto fallback;
780
687
}
791
698
case ENOMEM:
792
699
default:
793
700
errno = ret;
794
error(0, errno, "argp_parse");
701
perror("argp_parse");
795
702
exitstatus = EX_OSERR;
796
703
goto fallback;
797
704
case EINVAL:
811
718
case ENOMEM:
812
719
default:
813
720
errno = ret;
814
error(0, errno, "argp_parse");
721
perror("argp_parse");
815
722
exitstatus = EX_OSERR;
816
723
goto fallback;
817
724
case EINVAL:
819
726
goto fallback;
820
727
}
821
728
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
840
729
if(debug){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
731
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
732
p->name ? p->name : "Global", p->argc - 1);
844
733
for(char **a = p->argv; *a != NULL; a++){
851
740
}
852
741
}
853
742
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);
743
/* Strip permissions down to nobody */
744
setgid(gid);
889
745
if(ret == -1){
890
error(0, errno, "setgid");
746
perror("setgid");
891
747
}
892
748
ret = setuid(uid);
893
749
if(ret == -1){
894
error(0, errno, "setuid");
750
perror("setuid");
895
751
}
896
752
897
753
/* Open plugin directory with close_on_exec flag */
898
754
{
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
);
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
}
906
773
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
774
perror("Could not open plugin dir");
908
775
exitstatus = EX_UNAVAILABLE;
909
776
goto fallback;
910
777
}
913
780
/* Set the FD_CLOEXEC flag on the directory */
914
781
ret = set_cloexec_flag(dir_fd);
915
782
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
917
785
exitstatus = EX_OSERR;
918
786
goto fallback;
919
787
}
920
788
#endif /* O_CLOEXEC */
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
}
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;
944
796
}
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;
955
797
}
956
798
957
799
FD_ZERO(&rfds_all);
958
800
959
801
/* Read and execute any executable in the plugin directory*/
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]);
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");
966
874
continue;
967
875
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
969
878
if(ret == -1){
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
879
perror("stat");
880
free(filename);
973
881
continue;
974
882
}
975
883
976
884
/* Ignore non-executable files */
977
885
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
980
887
if(debug){
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);
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
985
890
}
986
close(plugin_fd);
987
free(direntries[i]);
891
free(filename);
988
892
continue;
989
893
}
990
894
991
plugin *p = getplugin(direntries[i]->d_name);
895
plugin *p = getplugin(dirst->d_name);
992
896
if(p == NULL){
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
897
perror("getplugin");
898
free(filename);
996
899
continue;
997
900
}
998
901
if(p->disabled){
999
902
if(debug){
1000
903
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
904
dirst->d_name);
1002
905
}
1003
close(plugin_fd);
1004
free(direntries[i]);
906
free(filename);
1005
907
continue;
1006
908
}
1007
909
{
1010
912
if(g != NULL){
1011
913
for(char **a = g->argv + 1; *a != NULL; a++){
1012
914
if(not add_argument(p, *a)){
1013
error(0, errno, "add_argument");
915
perror("add_argument");
1014
916
}
1015
917
}
1016
918
/* Add global environment variables */
1017
919
for(char **e = g->environ; *e != NULL; e++){
1018
920
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
921
perror("add_environment");
1020
922
}
1021
923
}
1022
924
}
1023
925
}
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
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. */
1026
929
if(p->environ[0] != NULL){
1027
930
for(char **e = environ; *e != NULL; e++){
1028
931
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
932
perror("add_environment");
1030
933
}
1031
934
}
1032
935
}
1033
936
1034
937
int pipefd[2];
1035
#ifndef O_CLOEXEC
1036
938
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 */
1040
939
if(ret == -1){
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
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
1056
944
/* Ask OS to automatic close the pipe on exec */
1057
945
ret = set_cloexec_flag(pipefd[0]);
1058
946
if(ret < 0){
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
947
perror("set_cloexec_flag");
1062
948
exitstatus = EX_OSERR;
1063
free(direntries[i]);
1064
949
goto fallback;
1065
950
}
1066
951
ret = set_cloexec_flag(pipefd[1]);
1067
952
if(ret < 0){
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
953
perror("set_cloexec_flag");
1071
954
exitstatus = EX_OSERR;
1072
free(direntries[i]);
1073
955
goto fallback;
1074
956
}
1075
#endif /* not O_CLOEXEC */
1076
957
/* Block SIGCHLD until process is safely in process list */
1077
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
959
&sigchld_action.sa_mask,
1079
960
NULL));
1080
961
if(ret < 0){
1081
error(0, errno, "sigprocmask");
962
perror("sigprocmask");
1082
963
exitstatus = EX_OSERR;
1083
free(direntries[i]);
1084
964
goto fallback;
1085
965
}
1086
966
/* Starting a new process to be watched */
1089
969
pid = fork();
1090
970
} while(pid == -1 and errno == EINTR);
1091
971
if(pid == -1){
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]);
972
perror("fork");
1097
973
exitstatus = EX_OSERR;
1098
free(direntries[i]);
1099
974
goto fallback;
1100
975
}
1101
976
if(pid == 0){
1102
977
/* this is the child process */
1103
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1104
979
if(ret < 0){
1105
error(0, errno, "sigaction");
980
perror("sigaction");
1106
981
_exit(EX_OSERR);
1107
982
}
1108
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1109
984
if(ret < 0){
1110
error(0, errno, "sigprocmask");
985
perror("sigprocmask");
1111
986
_exit(EX_OSERR);
1112
987
}
1113
988
1114
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1115
990
if(ret == -1){
1116
error(0, errno, "dup2");
991
perror("dup2");
1117
992
_exit(EX_OSERR);
1118
993
}
1119
994
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);
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
}
1126
1010
}
1127
1011
/* no return */
1128
1012
}
1129
1013
/* Parent process */
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
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);
1133
1018
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1019
perror("getplugin");
1135
1020
ret = (int)(TEMP_FAILURE_RETRY
1136
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
1022
NULL)));
1138
1023
if(ret < 0){
1139
error(0, errno, "sigprocmask");
1024
perror("sigprocmask");
1140
1025
}
1141
1026
exitstatus = EX_OSERR;
1142
free(direntries[i]);
1143
1027
goto fallback;
1144
1028
}
1145
free(direntries[i]);
1146
1029
1147
1030
new_plugin->pid = pid;
1148
1031
new_plugin->fd = pipefd[0];
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
1033
/* Unblock SIGCHLD so signal handler can be run if this process
1156
1034
has already completed */
1157
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
1036
&sigchld_action.sa_mask,
1159
1037
NULL));
1160
1038
if(ret < 0){
1161
error(0, errno, "sigprocmask");
1039
perror("sigprocmask");
1162
1040
exitstatus = EX_OSERR;
1163
1041
goto fallback;
1164
1042
}
1165
1043
1166
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1167
1046
1168
1047
if(maxfd < new_plugin->fd){
1169
1048
maxfd = new_plugin->fd;
1170
1049
}
1171
1050
}
1172
1051
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1177
1054
free_plugin(getplugin(NULL));
1178
1055
1179
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1192
1069
fd_set rfds = rfds_all;
1193
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1194
1071
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1072
perror("select");
1196
1073
exitstatus = EX_OSERR;
1197
1074
goto fallback;
1198
1075
}
1218
1095
(intmax_t) (proc->pid),
1219
1096
WTERMSIG(proc->status),
1220
1097
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));
1221
1101
}
1222
1102
}
1223
1103
1224
1104
/* Remove the plugin */
1225
FD_CLR(proc->fd, &rfds_all);
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1226
1107
1227
1108
/* Block signal while modifying process_list */
1228
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1230
1111
&sigchld_action.sa_mask,
1231
1112
NULL));
1232
1113
if(ret < 0){
1233
error(0, errno, "sigprocmask");
1114
perror("sigprocmask");
1234
1115
exitstatus = EX_OSERR;
1235
1116
goto fallback;
1236
1117
}
1244
1125
(sigprocmask(SIG_UNBLOCK,
1245
1126
&sigchld_action.sa_mask, NULL)));
1246
1127
if(ret < 0){
1247
error(0, errno, "sigprocmask");
1128
perror("sigprocmask");
1248
1129
exitstatus = EX_OSERR;
1249
1130
goto fallback;
1250
1131
}
1261
1142
bool bret = print_out_password(proc->buffer,
1262
1143
proc->buffer_length);
1263
1144
if(not bret){
1264
error(0, errno, "print_out_password");
1145
perror("print_out_password");
1265
1146
exitstatus = EX_IOERR;
1266
1147
}
1267
1148
goto fallback;
1268
1149
}
1269
1150
1270
1151
/* This process has not completed. Does it have any output? */
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1272
1155
/* This process had nothing to say at this time */
1273
1156
proc = proc->next;
1274
1157
continue;
1275
1158
}
1276
1159
/* Before reading, make the process' data buffer large enough */
1277
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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");
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
1282
1165
exitstatus = EX_OSERR;
1283
1166
goto fallback;
1284
1167
}
1285
proc->buffer = new_buffer;
1286
1168
proc->buffer_size += BUFFER_SIZE;
1287
1169
}
1288
1170
/* Read from the process */
1322
1204
}
1323
1205
bret = print_out_password(passwordbuffer, len);
1324
1206
if(not bret){
1325
error(0, errno, "print_out_password");
1207
perror("print_out_password");
1326
1208
exitstatus = EX_IOERR;
1327
1209
}
1328
1210
}
1330
1212
/* Restore old signal handler */
1331
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1332
1214
if(ret == -1){
1333
error(0, errno, "sigaction");
1215
perror("sigaction");
1334
1216
exitstatus = EX_OSERR;
1335
1217
}
1336
1218
1341
1223
free(custom_argv);
1342
1224
}
1343
1225
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1226
if(dir != NULL){
1227
closedir(dir);
1348
1228
}
1349
1229
1350
1230
/* Kill the processes */
1354
1234
ret = kill(p->pid, SIGTERM);
1355
1235
if(ret == -1 and errno != ESRCH){
1356
1236
/* Set-uid proccesses might not get closed */
1357
error(0, errno, "kill");
1237
perror("kill");
1358
1238
}
1359
1239
}
1360
1240
}
1364
1244
ret = wait(NULL);
1365
1245
} while(ret >= 0);
1366
1246
if(errno != ECHILD){
1367
error(0, errno, "wait");
1247
perror("wait");
1368
1248
}
1369
1249
1370
1250
free_plugin_list();
1371
1251
1372
1252
free(plugindir);
1373
free(pluginhelperdir);
1374
1253
free(argfile);
1375
1254
1376
1255
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0