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- Committer: Björn Påhlsson
- Date: 2010-09-01 13:04:23 UTC
- mto: (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 421.
- Revision ID: belorn@fukt.bsnet.se-20100901130423-bkn4j4vukasa1d27
New graphical boot supported: Plymouth
- 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 © 2008-2018 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
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
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
26
asprintf(), O_CLOEXEC */
28
27
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
31
30
#include <stdbool.h> /* bool, true, false */
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() */
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
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
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
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
*/
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() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
57
58
#include <errno.h> /* errno */
58
59
#include <argp.h> /* struct argp_option, struct
59
60
argp_state, struct argp,
69
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
73
76
74
#define BUFFER_SIZE 256
77
75
78
76
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
78
82
79
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
81
85
82
typedef struct plugin{
86
83
char *name; /* can be NULL or any plugin name */
106
103
107
104
/* Gets an existing plugin based on name,
108
105
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
106
static plugin *getplugin(char *name){
111
107
/* Check for existing plugin with that name */
112
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
173
169
}
174
170
175
171
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
172
static bool add_to_char_array(const char *new, char ***array,
178
173
int *len){
179
174
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
175
do {
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);
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
196
179
/* Malloc check */
197
if(new_array == NULL){
180
if(*array == NULL){
198
181
return false;
199
182
}
200
*array = new_array;
201
183
/* Make a copy of the new string */
202
184
char *copy;
203
185
do {
215
197
}
216
198
217
199
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
219
200
static bool add_argument(plugin *p, const char *arg){
220
201
if(p == NULL){
221
202
return false;
224
205
}
225
206
226
207
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
228
208
static bool add_environment(plugin *p, const char *def, bool replace){
229
209
if(p == NULL){
230
210
return false;
232
212
/* namelen = length of name of environment variable */
233
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
214
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
237
217
/* It already exists */
238
218
if(replace){
239
char *new_envdef;
219
char *new;
240
220
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
244
224
return false;
245
225
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
226
*e = new;
227
strcpy(*e, def);
248
228
}
249
229
return true;
250
230
}
252
232
return add_to_char_array(def, &(p->environ), &(p->envc));
253
233
}
254
234
255
#ifndef O_CLOEXEC
256
235
/*
257
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
237
* Descriptor Flags".
259
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
260
239
*/
261
__attribute__((warn_unused_result))
262
240
static int set_cloexec_flag(int fd){
263
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
264
242
/* If reading the flags failed, return error indication now. */
269
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
248
ret | FD_CLOEXEC));
271
249
}
272
#endif /* not O_CLOEXEC */
273
250
274
251
275
252
/* Mark processes as completed when they exit, and save their exit
289
266
/* No child processes */
290
267
break;
291
268
}
292
error(0, errno, "waitpid");
269
perror("waitpid");
293
270
}
294
271
295
272
/* A child exited, find it in process_list */
307
284
}
308
285
309
286
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
287
static bool print_out_password(const char *buffer, size_t length){
312
288
ssize_t ret;
313
289
for(size_t written = 0; written < length; written += (size_t)ret){
321
297
}
322
298
323
299
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
300
static void free_plugin(plugin *plugin_node){
326
301
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
328
303
free(*arg);
329
304
}
330
free(plugin_node->name);
331
305
free(plugin_node->argv);
332
306
for(char **env = plugin_node->environ; *env != NULL; env++){
333
307
free(*env);
360
334
361
335
int main(int argc, char *argv[]){
362
336
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
337
char *argfile = NULL;
365
338
FILE *conffp;
366
struct dirent **direntries = NULL;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
367
342
struct stat st;
368
343
fd_set rfds_all;
369
344
int ret, maxfd = 0;
377
352
.sa_flags = SA_NOCLDSTOP };
378
353
char **custom_argv = NULL;
379
354
int custom_argc = 0;
380
int dir_fd = -1;
381
355
382
356
/* Establish a signal handler */
383
357
sigemptyset(&sigchld_action.sa_mask);
384
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
385
359
if(ret == -1){
386
error(0, errno, "sigaddset");
360
perror("sigaddset");
387
361
exitstatus = EX_OSERR;
388
362
goto fallback;
389
363
}
390
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
391
365
if(ret == -1){
392
error(0, errno, "sigaction");
366
perror("sigaction");
393
367
exitstatus = EX_OSERR;
394
368
goto fallback;
395
369
}
428
402
.doc = "Group ID the plugins will run as", .group = 3 },
429
403
{ .name = "debug", .key = 132,
430
404
.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 },
435
405
/*
436
406
* These reproduce what we would get without ARGP_NO_HELP
437
407
*/
444
414
{ .name = NULL }
445
415
};
446
416
447
__attribute__((nonnull(3)))
448
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
418
errno = 0;
450
419
switch(key){
451
420
char *tmp;
452
intmax_t tmp_id;
421
intmax_t tmpmax;
453
422
case 'g': /* --global-options */
454
423
{
455
424
char *plugin_option;
458
427
break;
459
428
}
460
429
}
461
errno = 0;
462
430
}
463
431
break;
464
432
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
433
add_environment(getplugin(NULL), arg, true);
468
434
break;
469
435
case 'o': /* --options-for */
470
436
{
487
453
break;
488
454
}
489
455
}
490
errno = 0;
491
456
}
492
457
break;
493
458
case 'E': /* --env-for */
505
470
errno = EINVAL;
506
471
break;
507
472
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
473
add_environment(getplugin(arg), envdef, true);
511
474
}
512
475
break;
513
476
case 'd': /* --disable */
515
478
plugin *p = getplugin(arg);
516
479
if(p != NULL){
517
480
p->disabled = true;
518
errno = 0;
519
481
}
520
482
}
521
483
break;
524
486
plugin *p = getplugin(arg);
525
487
if(p != NULL){
526
488
p->disabled = false;
527
errno = 0;
528
489
}
529
490
}
530
491
break;
531
492
case 128: /* --plugin-dir */
532
493
free(plugindir);
533
494
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
537
495
break;
538
496
case 129: /* --config-file */
539
497
/* This is already done by parse_opt_config_file() */
540
498
break;
541
499
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
543
501
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
502
or tmpmax != (uid_t)tmpmax){
545
503
argp_error(state, "Bad user ID number: \"%s\", using %"
546
504
PRIdMAX, arg, (intmax_t)uid);
547
505
break;
548
506
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
507
uid = (uid_t)tmpmax;
551
508
break;
552
509
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
554
511
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
512
or tmpmax != (gid_t)tmpmax){
556
513
argp_error(state, "Bad group ID number: \"%s\", using %"
557
514
PRIdMAX, arg, (intmax_t)gid);
558
515
break;
559
516
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
517
gid = (gid_t)tmpmax;
562
518
break;
563
519
case 132: /* --debug */
564
520
debug = true;
565
521
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
522
/*
574
523
* These reproduce what we would get without ARGP_NO_HELP
575
524
*/
576
525
case '?': /* --help */
577
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
528
case -3: /* --usage */
581
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
530
argp_state_help(state, state->out_stream,
583
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
532
case 'V': /* --version */
586
533
fprintf(state->out_stream, "%s\n", argp_program_version);
587
534
exit(EXIT_SUCCESS);
597
544
if(arg[0] == '\0'){
598
545
break;
599
546
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
605
547
default:
606
548
return ARGP_ERR_UNKNOWN;
607
549
}
626
568
case 129: /* --config-file */
627
569
free(argfile);
628
570
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
632
571
break;
633
572
case 130: /* --userid */
634
573
case 131: /* --groupid */
635
574
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
575
case '?': /* --help */
638
576
case -3: /* --usage */
639
577
case 'V': /* --version */
661
599
case ENOMEM:
662
600
default:
663
601
errno = ret;
664
error(0, errno, "argp_parse");
602
perror("argp_parse");
665
603
exitstatus = EX_OSERR;
666
604
goto fallback;
667
605
case EINVAL:
688
626
custom_argc = 1;
689
627
custom_argv = malloc(sizeof(char*) * 2);
690
628
if(custom_argv == NULL){
691
error(0, errno, "malloc");
629
perror("malloc");
692
630
exitstatus = EX_OSERR;
693
631
goto fallback;
694
632
}
711
649
}
712
650
new_arg = strdup(p);
713
651
if(new_arg == NULL){
714
error(0, errno, "strdup");
652
perror("strdup");
715
653
exitstatus = EX_OSERR;
716
654
free(org_line);
717
655
goto fallback;
718
656
}
719
657
720
658
custom_argc += 1;
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
}
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;
744
666
}
745
667
custom_argv[custom_argc-1] = new_arg;
746
668
custom_argv[custom_argc] = NULL;
750
672
ret = fclose(conffp);
751
673
} while(ret == EOF and errno == EINTR);
752
674
if(ret == EOF){
753
error(0, errno, "fclose");
675
perror("fclose");
754
676
exitstatus = EX_IOERR;
755
677
goto fallback;
756
678
}
759
681
/* Check for harmful errors and go to fallback. Other errors might
760
682
not affect opening plugins */
761
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
684
perror("fopen");
763
685
exitstatus = EX_OSERR;
764
686
goto fallback;
765
687
}
776
698
case ENOMEM:
777
699
default:
778
700
errno = ret;
779
error(0, errno, "argp_parse");
701
perror("argp_parse");
780
702
exitstatus = EX_OSERR;
781
703
goto fallback;
782
704
case EINVAL:
796
718
case ENOMEM:
797
719
default:
798
720
errno = ret;
799
error(0, errno, "argp_parse");
721
perror("argp_parse");
800
722
exitstatus = EX_OSERR;
801
723
goto fallback;
802
724
case EINVAL:
804
726
goto fallback;
805
727
}
806
728
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
825
729
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
731
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
732
p->name ? p->name : "Global", p->argc - 1);
829
733
for(char **a = p->argv; *a != NULL; a++){
836
740
}
837
741
}
838
742
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);
743
/* Strip permissions down to nobody */
744
setgid(gid);
865
745
if(ret == -1){
866
error(0, errno, "setgid");
746
perror("setgid");
867
747
}
868
748
ret = setuid(uid);
869
749
if(ret == -1){
870
error(0, errno, "setuid");
750
perror("setuid");
871
751
}
872
752
873
753
/* Open plugin directory with close_on_exec flag */
874
754
{
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
);
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
}
882
773
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
774
perror("Could not open plugin dir");
884
775
exitstatus = EX_UNAVAILABLE;
885
776
goto fallback;
886
777
}
889
780
/* Set the FD_CLOEXEC flag on the directory */
890
781
ret = set_cloexec_flag(dir_fd);
891
782
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
893
785
exitstatus = EX_OSERR;
894
786
goto fallback;
895
787
}
896
788
#endif /* O_CLOEXEC */
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
}
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;
920
796
}
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;
931
797
}
932
798
933
799
FD_ZERO(&rfds_all);
934
800
935
801
/* Read and execute any executable in the plugin directory*/
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]);
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");
942
874
continue;
943
875
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
945
878
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
879
perror("stat");
880
free(filename);
949
881
continue;
950
882
}
951
883
952
884
/* Ignore non-executable files */
953
885
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
956
887
if(debug){
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);
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
961
890
}
962
close(plugin_fd);
963
free(direntries[i]);
891
free(filename);
964
892
continue;
965
893
}
966
894
967
plugin *p = getplugin(direntries[i]->d_name);
895
plugin *p = getplugin(dirst->d_name);
968
896
if(p == NULL){
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
897
perror("getplugin");
898
free(filename);
972
899
continue;
973
900
}
974
901
if(p->disabled){
975
902
if(debug){
976
903
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
977
direntries[i]->d_name);
904
dirst->d_name);
978
905
}
979
close(plugin_fd);
980
free(direntries[i]);
906
free(filename);
981
907
continue;
982
908
}
983
909
{
986
912
if(g != NULL){
987
913
for(char **a = g->argv + 1; *a != NULL; a++){
988
914
if(not add_argument(p, *a)){
989
error(0, errno, "add_argument");
915
perror("add_argument");
990
916
}
991
917
}
992
918
/* Add global environment variables */
993
919
for(char **e = g->environ; *e != NULL; e++){
994
920
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
921
perror("add_environment");
996
922
}
997
923
}
998
924
}
999
925
}
1000
/* If this plugin has any environment variables, we need to
1001
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. */
1002
929
if(p->environ[0] != NULL){
1003
930
for(char **e = environ; *e != NULL; e++){
1004
931
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
932
perror("add_environment");
1006
933
}
1007
934
}
1008
935
}
1009
936
1010
937
int pipefd[2];
1011
#ifndef O_CLOEXEC
1012
938
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 */
1016
939
if(ret == -1){
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
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
1032
944
/* Ask OS to automatic close the pipe on exec */
1033
945
ret = set_cloexec_flag(pipefd[0]);
1034
946
if(ret < 0){
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
947
perror("set_cloexec_flag");
1038
948
exitstatus = EX_OSERR;
1039
free(direntries[i]);
1040
949
goto fallback;
1041
950
}
1042
951
ret = set_cloexec_flag(pipefd[1]);
1043
952
if(ret < 0){
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
953
perror("set_cloexec_flag");
1047
954
exitstatus = EX_OSERR;
1048
free(direntries[i]);
1049
955
goto fallback;
1050
956
}
1051
#endif /* not O_CLOEXEC */
1052
957
/* Block SIGCHLD until process is safely in process list */
1053
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
959
&sigchld_action.sa_mask,
1055
960
NULL));
1056
961
if(ret < 0){
1057
error(0, errno, "sigprocmask");
962
perror("sigprocmask");
1058
963
exitstatus = EX_OSERR;
1059
free(direntries[i]);
1060
964
goto fallback;
1061
965
}
1062
966
/* Starting a new process to be watched */
1065
969
pid = fork();
1066
970
} while(pid == -1 and errno == EINTR);
1067
971
if(pid == -1){
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]);
972
perror("fork");
1073
973
exitstatus = EX_OSERR;
1074
free(direntries[i]);
1075
974
goto fallback;
1076
975
}
1077
976
if(pid == 0){
1078
977
/* this is the child process */
1079
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1080
979
if(ret < 0){
1081
error(0, errno, "sigaction");
980
perror("sigaction");
1082
981
_exit(EX_OSERR);
1083
982
}
1084
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
984
if(ret < 0){
1086
error(0, errno, "sigprocmask");
985
perror("sigprocmask");
1087
986
_exit(EX_OSERR);
1088
987
}
1089
988
1090
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1091
990
if(ret == -1){
1092
error(0, errno, "dup2");
991
perror("dup2");
1093
992
_exit(EX_OSERR);
1094
993
}
1095
994
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);
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
}
1102
1010
}
1103
1011
/* no return */
1104
1012
}
1105
1013
/* Parent process */
1106
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
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);
1109
1018
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1019
perror("getplugin");
1111
1020
ret = (int)(TEMP_FAILURE_RETRY
1112
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
1022
NULL)));
1114
1023
if(ret < 0){
1115
error(0, errno, "sigprocmask");
1024
perror("sigprocmask");
1116
1025
}
1117
1026
exitstatus = EX_OSERR;
1118
free(direntries[i]);
1119
1027
goto fallback;
1120
1028
}
1121
free(direntries[i]);
1122
1029
1123
1030
new_plugin->pid = pid;
1124
1031
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
1032
1131
1033
/* Unblock SIGCHLD so signal handler can be run if this process
1132
1034
has already completed */
1133
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
1036
&sigchld_action.sa_mask,
1135
1037
NULL));
1136
1038
if(ret < 0){
1137
error(0, errno, "sigprocmask");
1039
perror("sigprocmask");
1138
1040
exitstatus = EX_OSERR;
1139
1041
goto fallback;
1140
1042
}
1141
1043
1142
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1143
1046
1144
1047
if(maxfd < new_plugin->fd){
1145
1048
maxfd = new_plugin->fd;
1146
1049
}
1147
1050
}
1148
1051
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1153
1054
free_plugin(getplugin(NULL));
1154
1055
1155
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1168
1069
fd_set rfds = rfds_all;
1169
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1170
1071
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1072
perror("select");
1172
1073
exitstatus = EX_OSERR;
1173
1074
goto fallback;
1174
1075
}
1194
1095
(intmax_t) (proc->pid),
1195
1096
WTERMSIG(proc->status),
1196
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));
1197
1101
}
1198
1102
}
1199
1103
1200
1104
/* Remove the plugin */
1201
FD_CLR(proc->fd, &rfds_all);
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1202
1107
1203
1108
/* Block signal while modifying process_list */
1204
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1206
1111
&sigchld_action.sa_mask,
1207
1112
NULL));
1208
1113
if(ret < 0){
1209
error(0, errno, "sigprocmask");
1114
perror("sigprocmask");
1210
1115
exitstatus = EX_OSERR;
1211
1116
goto fallback;
1212
1117
}
1220
1125
(sigprocmask(SIG_UNBLOCK,
1221
1126
&sigchld_action.sa_mask, NULL)));
1222
1127
if(ret < 0){
1223
error(0, errno, "sigprocmask");
1128
perror("sigprocmask");
1224
1129
exitstatus = EX_OSERR;
1225
1130
goto fallback;
1226
1131
}
1237
1142
bool bret = print_out_password(proc->buffer,
1238
1143
proc->buffer_length);
1239
1144
if(not bret){
1240
error(0, errno, "print_out_password");
1145
perror("print_out_password");
1241
1146
exitstatus = EX_IOERR;
1242
1147
}
1243
1148
goto fallback;
1244
1149
}
1245
1150
1246
1151
/* This process has not completed. Does it have any output? */
1247
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 */
1248
1155
/* This process had nothing to say at this time */
1249
1156
proc = proc->next;
1250
1157
continue;
1251
1158
}
1252
1159
/* Before reading, make the process' data buffer large enough */
1253
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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");
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
1258
1165
exitstatus = EX_OSERR;
1259
1166
goto fallback;
1260
1167
}
1261
proc->buffer = new_buffer;
1262
1168
proc->buffer_size += BUFFER_SIZE;
1263
1169
}
1264
1170
/* Read from the process */
1298
1204
}
1299
1205
bret = print_out_password(passwordbuffer, len);
1300
1206
if(not bret){
1301
error(0, errno, "print_out_password");
1207
perror("print_out_password");
1302
1208
exitstatus = EX_IOERR;
1303
1209
}
1304
1210
}
1306
1212
/* Restore old signal handler */
1307
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1308
1214
if(ret == -1){
1309
error(0, errno, "sigaction");
1215
perror("sigaction");
1310
1216
exitstatus = EX_OSERR;
1311
1217
}
1312
1218
1317
1223
free(custom_argv);
1318
1224
}
1319
1225
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1226
if(dir != NULL){
1227
closedir(dir);
1324
1228
}
1325
1229
1326
1230
/* Kill the processes */
1330
1234
ret = kill(p->pid, SIGTERM);
1331
1235
if(ret == -1 and errno != ESRCH){
1332
1236
/* Set-uid proccesses might not get closed */
1333
error(0, errno, "kill");
1237
perror("kill");
1334
1238
}
1335
1239
}
1336
1240
}
1340
1244
ret = wait(NULL);
1341
1245
} while(ret >= 0);
1342
1246
if(errno != ECHILD){
1343
error(0, errno, "wait");
1247
perror("wait");
1344
1248
}
1345
1249
1346
1250
free_plugin_list();
1347
1251
1348
1252
free(plugindir);
1349
free(pluginhelperdir);
1350
1253
free(argfile);
1351
1254
1352
1255
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0