To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.4.27
- compare with another revision
- download diff
- download tarball
- view history from revision 237.4.27
- Committer: Teddy Hogeborn
- Date: 2012-01-15 21:02:37 UTC
- mfrom: (558 trunk)
- mto: (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 559.
- Revision ID: teddy@recompile.se-20120115210237-6mcl2zuoxyn5smr5
Merge from trunk.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- 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
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
42
42
WCOREDUMP() */
43
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
46
readdir(), closedir(), dirfd() */
47
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
48
fcntl(), setuid(), setgid(),
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
55
FD_CLOEXEC */
56
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
57
strsignal(), strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
68
68
*/
69
69
#include <errno.h> /* errno, EBADF */
70
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
71
75
72
76
#define BUFFER_SIZE 256
73
77
75
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
80
77
81
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
83
80
84
typedef struct plugin{
81
85
char *name; /* can be NULL or any plugin name */
102
106
/* Gets an existing plugin based on name,
103
107
or if none is found, creates a new one */
104
108
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
106
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
111
if((p->name == name)
108
112
or (p->name and name and (strcmp(p->name, name) == 0))){
111
115
}
112
116
/* Create a new plugin */
113
117
plugin *new_plugin = NULL;
114
do{
118
do {
115
119
new_plugin = malloc(sizeof(plugin));
116
}while(new_plugin == NULL and errno == EINTR);
120
} while(new_plugin == NULL and errno == EINTR);
117
121
if(new_plugin == NULL){
118
122
return NULL;
119
123
}
120
124
char *copy_name = NULL;
121
125
if(name != NULL){
122
do{
126
do {
123
127
copy_name = strdup(name);
124
}while(copy_name == NULL and errno == EINTR);
128
} while(copy_name == NULL and errno == EINTR);
125
129
if(copy_name == NULL){
130
int e = errno;
126
131
free(new_plugin);
132
errno = e;
127
133
return NULL;
128
134
}
129
135
}
133
139
.disabled = false,
134
140
.next = plugin_list };
135
141
136
do{
142
do {
137
143
new_plugin->argv = malloc(sizeof(char *) * 2);
138
}while(new_plugin->argv == NULL and errno == EINTR);
144
} while(new_plugin->argv == NULL and errno == EINTR);
139
145
if(new_plugin->argv == NULL){
146
int e = errno;
140
147
free(copy_name);
141
148
free(new_plugin);
149
errno = e;
142
150
return NULL;
143
151
}
144
152
new_plugin->argv[0] = copy_name;
145
153
new_plugin->argv[1] = NULL;
146
154
147
do{
155
do {
148
156
new_plugin->environ = malloc(sizeof(char *));
149
}while(new_plugin->environ == NULL and errno == EINTR);
157
} while(new_plugin->environ == NULL and errno == EINTR);
150
158
if(new_plugin->environ == NULL){
159
int e = errno;
151
160
free(copy_name);
152
161
free(new_plugin->argv);
153
162
free(new_plugin);
163
errno = e;
154
164
return NULL;
155
165
}
156
166
new_plugin->environ[0] = NULL;
161
171
}
162
172
163
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
164
175
static bool add_to_char_array(const char *new, char ***array,
165
176
int *len){
166
177
/* Resize the pointed-to array to hold one more pointer */
167
do{
178
do {
168
179
*array = realloc(*array, sizeof(char *)
169
180
* (size_t) ((*len) + 2));
170
}while(*array == NULL and errno == EINTR);
181
} while(*array == NULL and errno == EINTR);
171
182
/* Malloc check */
172
183
if(*array == NULL){
173
184
return false;
174
185
}
175
186
/* Make a copy of the new string */
176
187
char *copy;
177
do{
188
do {
178
189
copy = strdup(new);
179
}while(copy == NULL and errno == EINTR);
190
} while(copy == NULL and errno == EINTR);
180
191
if(copy == NULL){
181
192
return false;
182
193
}
189
200
}
190
201
191
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
192
204
static bool add_argument(plugin *p, const char *arg){
193
205
if(p == NULL){
194
206
return false;
197
209
}
198
210
199
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
200
213
static bool add_environment(plugin *p, const char *def, bool replace){
201
214
if(p == NULL){
202
215
return false;
209
222
/* It already exists */
210
223
if(replace){
211
224
char *new;
212
do{
225
do {
213
226
new = realloc(*e, strlen(def) + 1);
214
}while(new == NULL and errno == EINTR);
227
} while(new == NULL and errno == EINTR);
215
228
if(new == NULL){
216
229
return false;
217
230
}
230
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
231
244
*/
232
245
static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
234
247
/* If reading the flags failed, return error indication now. */
235
248
if(ret < 0){
236
249
return ret;
237
250
}
238
251
/* Store modified flag word in the descriptor. */
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
240
254
}
241
255
242
256
257
271
/* No child processes */
258
272
break;
259
273
}
260
perror("waitpid");
274
error(0, errno, "waitpid");
261
275
}
262
276
263
277
/* A child exited, find it in process_list */
275
289
}
276
290
277
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
278
293
static bool print_out_password(const char *buffer, size_t length){
279
294
ssize_t ret;
280
295
for(size_t written = 0; written < length; written += (size_t)ret){
288
303
}
289
304
290
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
291
307
static void free_plugin(plugin *plugin_node){
292
308
293
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
348
364
sigemptyset(&sigchld_action.sa_mask);
349
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
350
366
if(ret == -1){
351
perror("sigaddset");
352
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
353
369
goto fallback;
354
370
}
355
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
356
372
if(ret == -1){
357
perror("sigaction");
358
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
359
375
goto fallback;
360
376
}
361
377
393
409
.doc = "Group ID the plugins will run as", .group = 3 },
394
410
{ .name = "debug", .key = 132,
395
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
396
421
{ .name = NULL }
397
422
};
398
423
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
401
427
switch(key){
402
428
char *tmp;
403
intmax_t tmpmax;
429
intmax_t tmp_id;
404
430
case 'g': /* --global-options */
405
if(arg != NULL){
431
{
406
432
char *plugin_option;
407
433
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
409
continue;
410
}
411
434
if(not add_argument(getplugin(NULL), plugin_option)){
412
perror("add_argument");
413
return ARGP_ERR_UNKNOWN;
435
break;
414
436
}
415
437
}
416
438
}
417
439
break;
418
440
case 'G': /* --global-env */
419
if(arg == NULL){
420
break;
421
}
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
424
}
441
add_environment(getplugin(NULL), arg, true);
425
442
break;
426
443
case 'o': /* --options-for */
427
if(arg != NULL){
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
430
break;
431
}
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
return ARGP_ERR_UNKNOWN;
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
437
462
}
438
463
}
439
464
}
440
465
break;
441
466
case 'E': /* --env-for */
442
if(arg == NULL){
443
break;
444
}
445
467
{
446
468
char *envdef = strchr(arg, ':');
447
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
448
472
break;
449
473
}
450
474
*envdef = '\0';
451
if(not add_environment(getplugin(arg), envdef+1, true)){
452
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
453
480
}
481
add_environment(getplugin(arg), envdef, true);
454
482
}
455
483
break;
456
484
case 'd': /* --disable */
457
if(arg != NULL){
485
{
458
486
plugin *p = getplugin(arg);
459
if(p == NULL){
460
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
461
489
}
462
p->disabled = true;
463
490
}
464
491
break;
465
492
case 'e': /* --enable */
466
if(arg != NULL){
493
{
467
494
plugin *p = getplugin(arg);
468
if(p == NULL){
469
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
470
497
}
471
p->disabled = false;
472
498
}
473
499
break;
474
500
case 128: /* --plugin-dir */
475
501
free(plugindir);
476
502
plugindir = strdup(arg);
477
if(plugindir == NULL){
478
perror("strdup");
479
}
480
503
break;
481
504
case 129: /* --config-file */
482
505
/* This is already done by parse_opt_config_file() */
483
506
break;
484
507
case 130: /* --userid */
485
errno = 0;
486
tmpmax = strtoimax(arg, &tmp, 10);
508
tmp_id = strtoimax(arg, &tmp, 10);
487
509
if(errno != 0 or tmp == arg or *tmp != '\0'
488
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
491
} else {
492
uid = (uid_t)tmpmax;
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
493
514
}
515
uid = (uid_t)tmp_id;
494
516
break;
495
517
case 131: /* --groupid */
496
errno = 0;
497
tmpmax = strtoimax(arg, &tmp, 10);
518
tmp_id = strtoimax(arg, &tmp, 10);
498
519
if(errno != 0 or tmp == arg or *tmp != '\0'
499
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
502
} else {
503
gid = (gid_t)tmpmax;
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
504
524
}
525
gid = (gid_t)tmp_id;
505
526
break;
506
527
case 132: /* --debug */
507
528
debug = true;
508
529
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
509
544
/*
510
545
* When adding more options before this line, remember to also add a
511
546
* "case" to the "parse_opt_config_file" function below.
514
549
/* Cryptsetup always passes an argument, which is an empty
515
550
string if "none" was specified in /etc/crypttab. So if
516
551
argument was empty, we ignore it silently. */
517
if(arg[0] != '\0'){
518
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
519
554
}
520
break;
521
case ARGP_KEY_END:
522
break;
523
555
default:
524
556
return ARGP_ERR_UNKNOWN;
525
557
}
526
return 0;
558
return errno; /* Set to 0 at start */
527
559
}
528
560
529
561
/* This option parser is the same as parse_opt() above, except it
531
563
error_t parse_opt_config_file(int key, char *arg,
532
564
__attribute__((unused))
533
565
struct argp_state *state){
566
errno = 0;
534
567
switch(key){
535
568
case 'g': /* --global-options */
536
569
case 'G': /* --global-env */
543
576
case 129: /* --config-file */
544
577
free(argfile);
545
578
argfile = strdup(arg);
546
if(argfile == NULL){
547
perror("strdup");
548
}
549
579
break;
550
580
case 130: /* --userid */
551
581
case 131: /* --groupid */
552
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
553
586
case ARGP_KEY_ARG:
554
case ARGP_KEY_END:
555
587
break;
556
588
default:
557
589
return ARGP_ERR_UNKNOWN;
558
590
}
559
return 0;
591
return errno;
560
592
}
561
593
562
594
struct argp argp = { .options = options,
566
598
567
599
/* Parse using parse_opt_config_file() in order to get the custom
568
600
config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
571
fprintf(stderr, "Unknown error while parsing arguments\n");
572
exitstatus = EXIT_FAILURE;
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
573
615
goto fallback;
574
616
}
575
617
592
634
custom_argc = 1;
593
635
custom_argv = malloc(sizeof(char*) * 2);
594
636
if(custom_argv == NULL){
595
perror("malloc");
596
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
597
639
goto fallback;
598
640
}
599
641
custom_argv[0] = argv[0];
615
657
}
616
658
new_arg = strdup(p);
617
659
if(new_arg == NULL){
618
perror("strdup");
619
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
620
662
free(org_line);
621
663
goto fallback;
622
664
}
625
667
custom_argv = realloc(custom_argv, sizeof(char *)
626
668
* ((unsigned int) custom_argc + 1));
627
669
if(custom_argv == NULL){
628
perror("realloc");
629
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
630
672
free(org_line);
631
673
goto fallback;
632
674
}
634
676
custom_argv[custom_argc] = NULL;
635
677
}
636
678
}
637
do{
679
do {
638
680
ret = fclose(conffp);
639
}while(ret == EOF and errno == EINTR);
681
} while(ret == EOF and errno == EINTR);
640
682
if(ret == EOF){
641
perror("fclose");
642
exitstatus = EXIT_FAILURE;
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
643
685
goto fallback;
644
686
}
645
687
free(org_line);
647
689
/* Check for harmful errors and go to fallback. Other errors might
648
690
not affect opening plugins */
649
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
perror("fopen");
651
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
652
694
goto fallback;
653
695
}
654
696
}
655
/* If there was any arguments from configuration file,
656
pass them to parser as command arguments */
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
657
699
if(custom_argv != NULL){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
659
0, NULL);
660
if(ret == ARGP_ERR_UNKNOWN){
661
fprintf(stderr, "Unknown error while parsing arguments\n");
662
exitstatus = EXIT_FAILURE;
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
663
714
goto fallback;
664
715
}
665
716
}
666
717
667
718
/* Parse actual command line arguments, to let them override the
668
719
config file */
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
exitstatus = EXIT_FAILURE;
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
673
734
goto fallback;
674
735
}
675
736
687
748
}
688
749
}
689
750
690
/* Strip permissions down to nobody */
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
691
774
setgid(gid);
692
775
if(ret == -1){
693
perror("setgid");
776
error(0, errno, "setgid");
694
777
}
695
778
ret = setuid(uid);
696
779
if(ret == -1){
697
perror("setuid");
698
}
699
700
if(plugindir == NULL){
701
dir = opendir(PDIR);
702
} else {
703
dir = opendir(plugindir);
704
}
705
706
if(dir == NULL){
707
perror("Could not open plugin dir");
708
exitstatus = EXIT_FAILURE;
709
goto fallback;
710
}
711
712
/* Set the FD_CLOEXEC flag on the directory, if possible */
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
713
784
{
714
int dir_fd = dirfd(dir);
715
if(dir_fd >= 0){
716
ret = set_cloexec_flag(dir_fd);
717
if(ret < 0){
718
perror("set_cloexec_flag");
719
exitstatus = EXIT_FAILURE;
720
goto fallback;
721
}
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
722
826
}
723
827
}
724
828
726
830
727
831
/* Read and execute any executable in the plugin directory*/
728
832
while(true){
729
do{
833
do {
730
834
dirst = readdir(dir);
731
}while(dirst == NULL and errno == EINTR);
835
} while(dirst == NULL and errno == EINTR);
732
836
733
837
/* All directory entries have been processed */
734
838
if(dirst == NULL){
735
839
if(errno == EBADF){
736
perror("readdir");
737
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
738
842
goto fallback;
739
843
}
740
844
break;
770
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
771
875
size_t suf_len = strlen(*suf);
772
876
if((d_name_len >= suf_len)
773
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
774
878
== 0)){
775
879
if(debug){
776
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
788
892
789
893
char *filename;
790
894
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
792
dirst->d_name));
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
793
897
} else {
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
795
dirst->d_name));
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
796
901
}
797
902
if(ret < 0){
798
perror("asprintf");
903
error(0, errno, "asprintf");
799
904
continue;
800
905
}
801
906
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
803
908
if(ret == -1){
804
perror("stat");
909
error(0, errno, "stat");
805
910
free(filename);
806
911
continue;
807
912
}
819
924
820
925
plugin *p = getplugin(dirst->d_name);
821
926
if(p == NULL){
822
perror("getplugin");
927
error(0, errno, "getplugin");
823
928
free(filename);
824
929
continue;
825
930
}
837
942
if(g != NULL){
838
943
for(char **a = g->argv + 1; *a != NULL; a++){
839
944
if(not add_argument(p, *a)){
840
perror("add_argument");
945
error(0, errno, "add_argument");
841
946
}
842
947
}
843
948
/* Add global environment variables */
844
949
for(char **e = g->environ; *e != NULL; e++){
845
950
if(not add_environment(p, *e, false)){
846
perror("add_environment");
951
error(0, errno, "add_environment");
847
952
}
848
953
}
849
954
}
854
959
if(p->environ[0] != NULL){
855
960
for(char **e = environ; *e != NULL; e++){
856
961
if(not add_environment(p, *e, false)){
857
perror("add_environment");
962
error(0, errno, "add_environment");
858
963
}
859
964
}
860
965
}
861
966
862
967
int pipefd[2];
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
864
969
if(ret == -1){
865
perror("pipe");
866
exitstatus = EXIT_FAILURE;
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
867
972
goto fallback;
868
973
}
869
974
/* Ask OS to automatic close the pipe on exec */
870
975
ret = set_cloexec_flag(pipefd[0]);
871
976
if(ret < 0){
872
perror("set_cloexec_flag");
873
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
874
979
goto fallback;
875
980
}
876
981
ret = set_cloexec_flag(pipefd[1]);
877
982
if(ret < 0){
878
perror("set_cloexec_flag");
879
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
880
985
goto fallback;
881
986
}
882
987
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
885
NULL));
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
886
991
if(ret < 0){
887
perror("sigprocmask");
888
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
889
994
goto fallback;
890
995
}
891
996
/* Starting a new process to be watched */
892
997
pid_t pid;
893
do{
998
do {
894
999
pid = fork();
895
}while(pid == -1 and errno == EINTR);
1000
} while(pid == -1 and errno == EINTR);
896
1001
if(pid == -1){
897
perror("fork");
898
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
899
1004
goto fallback;
900
1005
}
901
1006
if(pid == 0){
902
1007
/* this is the child process */
903
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
904
1009
if(ret < 0){
905
perror("sigaction");
906
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
907
1012
}
908
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
1014
if(ret < 0){
910
perror("sigprocmask");
911
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
912
1017
}
913
1018
914
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
915
1020
if(ret == -1){
916
perror("dup2");
917
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
918
1023
}
919
1024
920
1025
if(dirfd(dir) < 0){
924
1029
}
925
1030
if(p->environ[0] == NULL){
926
1031
if(execv(filename, p->argv) < 0){
927
perror("execv");
928
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
929
1034
}
930
1035
} else {
931
1036
if(execve(filename, p->argv, p->environ) < 0){
932
perror("execve");
933
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
934
1039
}
935
1040
}
936
1041
/* no return */
941
1046
free(filename);
942
1047
plugin *new_plugin = getplugin(dirst->d_name);
943
1048
if(new_plugin == NULL){
944
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
947
NULL));
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
948
1053
if(ret < 0){
949
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
950
1055
}
951
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
952
1057
goto fallback;
953
1058
}
954
1059
957
1062
958
1063
/* Unblock SIGCHLD so signal handler can be run if this process
959
1064
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
963
1068
if(ret < 0){
964
perror("sigprocmask");
965
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
966
1071
goto fallback;
967
1072
}
968
1073
969
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
970
1076
971
1077
if(maxfd < new_plugin->fd){
972
1078
maxfd = new_plugin->fd;
993
1099
fd_set rfds = rfds_all;
994
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
1101
if(select_ret == -1 and errno != EINTR){
996
perror("select");
997
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
998
1104
goto fallback;
999
1105
}
1000
1106
/* OK, now either a process completed, or something can be read
1026
1132
}
1027
1133
1028
1134
/* Remove the plugin */
1029
FD_CLR(proc->fd, &rfds_all);
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1030
1137
1031
1138
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1034
NULL));
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
1035
1143
if(ret < 0){
1036
perror("sigprocmask");
1037
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
1038
1146
goto fallback;
1039
1147
}
1040
1148
1043
1151
proc = next_plugin;
1044
1152
1045
1153
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1048
NULL));
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
1049
1157
if(ret < 0){
1050
perror("sigprocmask");
1051
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1052
1160
goto fallback;
1053
1161
}
1054
1162
1064
1172
bool bret = print_out_password(proc->buffer,
1065
1173
proc->buffer_length);
1066
1174
if(not bret){
1067
perror("print_out_password");
1068
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1069
1177
}
1070
1178
goto fallback;
1071
1179
}
1072
1180
1073
1181
/* This process has not completed. Does it have any output? */
1074
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1075
1185
/* This process had nothing to say at this time */
1076
1186
proc = proc->next;
1077
1187
continue;
1081
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1082
1192
+ (size_t) BUFFER_SIZE);
1083
1193
if(proc->buffer == NULL){
1084
perror("malloc");
1085
exitstatus = EXIT_FAILURE;
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1086
1196
goto fallback;
1087
1197
}
1088
1198
proc->buffer_size += BUFFER_SIZE;
1109
1219
1110
1220
fallback:
1111
1221
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1113
1224
/* Fallback if all plugins failed, none are found or an error
1114
1225
occured */
1115
1226
bool bret;
1123
1234
}
1124
1235
bret = print_out_password(passwordbuffer, len);
1125
1236
if(not bret){
1126
perror("print_out_password");
1127
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1128
1239
}
1129
1240
}
1130
1241
1131
1242
/* Restore old signal handler */
1132
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1133
1244
if(ret == -1){
1134
perror("sigaction");
1135
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1136
1247
}
1137
1248
1138
1249
if(custom_argv != NULL){
1153
1264
ret = kill(p->pid, SIGTERM);
1154
1265
if(ret == -1 and errno != ESRCH){
1155
1266
/* Set-uid proccesses might not get closed */
1156
perror("kill");
1267
error(0, errno, "kill");
1157
1268
}
1158
1269
}
1159
1270
}
1160
1271
1161
1272
/* Wait for any remaining child processes to terminate */
1162
do{
1273
do {
1163
1274
ret = wait(NULL);
1164
1275
} while(ret >= 0);
1165
1276
if(errno != ECHILD){
1166
perror("wait");
1277
error(0, errno, "wait");
1167
1278
}
1168
1279
1169
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0