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- Committer: Björn Påhlsson
- Date: 2009-09-21 13:51:11 UTC
- mfrom: (237.2.142 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20090921135111-zvsg8bjfglffgp51
merge
- files removed:
- 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 © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), 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, fdopendir(),
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
46
readdir(), closedir(), dirfd() */
47
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
48
fcntl(), setuid(), setgid(),
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() */
75
71
76
72
#define BUFFER_SIZE 256
77
73
79
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
76
81
77
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
79
84
80
typedef struct plugin{
85
81
char *name; /* can be NULL or any plugin name */
105
101
106
102
/* Gets an existing plugin based on name,
107
103
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
104
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
105
/* Check for exiting plugin with that name */
111
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
107
if((p->name == name)
113
108
or (p->name and name and (strcmp(p->name, name) == 0))){
128
123
copy_name = strdup(name);
129
124
} while(copy_name == NULL and errno == EINTR);
130
125
if(copy_name == NULL){
131
int e = errno;
132
126
free(new_plugin);
133
errno = e;
134
127
return NULL;
135
128
}
136
129
}
144
137
new_plugin->argv = malloc(sizeof(char *) * 2);
145
138
} while(new_plugin->argv == NULL and errno == EINTR);
146
139
if(new_plugin->argv == NULL){
147
int e = errno;
148
140
free(copy_name);
149
141
free(new_plugin);
150
errno = e;
151
142
return NULL;
152
143
}
153
144
new_plugin->argv[0] = copy_name;
157
148
new_plugin->environ = malloc(sizeof(char *));
158
149
} while(new_plugin->environ == NULL and errno == EINTR);
159
150
if(new_plugin->environ == NULL){
160
int e = errno;
161
151
free(copy_name);
162
152
free(new_plugin->argv);
163
153
free(new_plugin);
164
errno = e;
165
154
return NULL;
166
155
}
167
156
new_plugin->environ[0] = NULL;
172
161
}
173
162
174
163
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
164
static bool add_to_char_array(const char *new, char ***array,
177
165
int *len){
178
166
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
167
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
184
171
/* Malloc check */
185
if(new_array == NULL){
172
if(*array == NULL){
186
173
return false;
187
174
}
188
*array = new_array;
189
175
/* Make a copy of the new string */
190
176
char *copy;
191
177
do {
203
189
}
204
190
205
191
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
192
static bool add_argument(plugin *p, const char *arg){
208
193
if(p == NULL){
209
194
return false;
212
197
}
213
198
214
199
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
200
static bool add_environment(plugin *p, const char *def, bool replace){
217
201
if(p == NULL){
218
202
return false;
220
204
/* namelen = length of name of environment variable */
221
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
206
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
225
209
/* It already exists */
226
210
if(replace){
227
char *new_envdef;
211
char *new;
228
212
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
232
216
return false;
233
217
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
218
*e = new;
219
strcpy(*e, def);
236
220
}
237
221
return true;
238
222
}
245
229
* Descriptor Flags".
246
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
247
231
*/
248
__attribute__((warn_unused_result))
249
232
static int set_cloexec_flag(int fd){
250
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
251
234
/* If reading the flags failed, return error indication now. */
275
258
/* No child processes */
276
259
break;
277
260
}
278
error(0, errno, "waitpid");
261
perror("waitpid");
279
262
}
280
263
281
264
/* A child exited, find it in process_list */
293
276
}
294
277
295
278
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
297
279
static bool print_out_password(const char *buffer, size_t length){
298
280
ssize_t ret;
299
281
for(size_t written = 0; written < length; written += (size_t)ret){
307
289
}
308
290
309
291
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
311
292
static void free_plugin(plugin *plugin_node){
312
293
313
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
368
349
sigemptyset(&sigchld_action.sa_mask);
369
350
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
370
351
if(ret == -1){
371
error(0, errno, "sigaddset");
372
exitstatus = EX_OSERR;
352
perror("sigaddset");
353
exitstatus = EXIT_FAILURE;
373
354
goto fallback;
374
355
}
375
356
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
376
357
if(ret == -1){
377
error(0, errno, "sigaction");
378
exitstatus = EX_OSERR;
358
perror("sigaction");
359
exitstatus = EXIT_FAILURE;
379
360
goto fallback;
380
361
}
381
362
413
394
.doc = "Group ID the plugins will run as", .group = 3 },
414
395
{ .name = "debug", .key = 132,
415
396
.doc = "Debug mode", .group = 4 },
416
/*
417
* These reproduce what we would get without ARGP_NO_HELP
418
*/
419
{ .name = "help", .key = '?',
420
.doc = "Give this help list", .group = -1 },
421
{ .name = "usage", .key = -3,
422
.doc = "Give a short usage message", .group = -1 },
423
{ .name = "version", .key = 'V',
424
.doc = "Print program version", .group = -1 },
425
397
{ .name = NULL }
426
398
};
427
399
428
__attribute__((nonnull(3)))
429
error_t parse_opt(int key, char *arg, struct argp_state *state){
430
errno = 0;
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
431
402
switch(key){
432
403
char *tmp;
433
intmax_t tmp_id;
404
intmax_t tmpmax;
434
405
case 'g': /* --global-options */
435
{
406
if(arg != NULL){
436
407
char *plugin_option;
437
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
410
continue;
411
}
438
412
if(not add_argument(getplugin(NULL), plugin_option)){
439
break;
413
perror("add_argument");
414
return ARGP_ERR_UNKNOWN;
440
415
}
441
416
}
442
errno = 0;
443
417
}
444
418
break;
445
419
case 'G': /* --global-env */
446
if(add_environment(getplugin(NULL), arg, true)){
447
errno = 0;
420
if(arg == NULL){
421
break;
422
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
448
425
}
449
426
break;
450
427
case 'o': /* --options-for */
451
{
452
char *option_list = strchr(arg, ':');
453
if(option_list == NULL){
454
argp_error(state, "No colon in \"%s\"", arg);
455
errno = EINVAL;
456
break;
457
}
458
*option_list = '\0';
459
option_list++;
460
if(arg[0] == '\0'){
461
argp_error(state, "Empty plugin name");
462
errno = EINVAL;
463
break;
464
}
465
char *option;
466
while((option = strsep(&option_list, ",")) != NULL){
467
if(not add_argument(getplugin(arg), option)){
468
break;
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
469
438
}
470
439
}
471
errno = 0;
472
440
}
473
441
break;
474
442
case 'E': /* --env-for */
443
if(arg == NULL){
444
break;
445
}
475
446
{
476
447
char *envdef = strchr(arg, ':');
477
448
if(envdef == NULL){
478
argp_error(state, "No colon in \"%s\"", arg);
479
errno = EINVAL;
480
449
break;
481
450
}
482
451
*envdef = '\0';
483
envdef++;
484
if(arg[0] == '\0'){
485
argp_error(state, "Empty plugin name");
486
errno = EINVAL;
487
break;
488
}
489
if(add_environment(getplugin(arg), envdef, true)){
490
errno = 0;
452
if(not add_environment(getplugin(arg), envdef+1, true)){
453
perror("add_environment");
491
454
}
492
455
}
493
456
break;
494
457
case 'd': /* --disable */
495
{
458
if(arg != NULL){
496
459
plugin *p = getplugin(arg);
497
if(p != NULL){
498
p->disabled = true;
499
errno = 0;
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
500
462
}
463
p->disabled = true;
501
464
}
502
465
break;
503
466
case 'e': /* --enable */
504
{
467
if(arg != NULL){
505
468
plugin *p = getplugin(arg);
506
if(p != NULL){
507
p->disabled = false;
508
errno = 0;
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
509
471
}
472
p->disabled = false;
510
473
}
511
474
break;
512
475
case 128: /* --plugin-dir */
513
476
free(plugindir);
514
477
plugindir = strdup(arg);
515
if(plugindir != NULL){
516
errno = 0;
478
if(plugindir == NULL){
479
perror("strdup");
517
480
}
518
481
break;
519
482
case 129: /* --config-file */
520
483
/* This is already done by parse_opt_config_file() */
521
484
break;
522
485
case 130: /* --userid */
523
tmp_id = strtoimax(arg, &tmp, 10);
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
524
488
if(errno != 0 or tmp == arg or *tmp != '\0'
525
or tmp_id != (uid_t)tmp_id){
526
argp_error(state, "Bad user ID number: \"%s\", using %"
527
PRIdMAX, arg, (intmax_t)uid);
528
break;
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
529
494
}
530
uid = (uid_t)tmp_id;
531
errno = 0;
532
495
break;
533
496
case 131: /* --groupid */
534
tmp_id = strtoimax(arg, &tmp, 10);
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
535
499
if(errno != 0 or tmp == arg or *tmp != '\0'
536
or tmp_id != (gid_t)tmp_id){
537
argp_error(state, "Bad group ID number: \"%s\", using %"
538
PRIdMAX, arg, (intmax_t)gid);
539
break;
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
540
505
}
541
gid = (gid_t)tmp_id;
542
errno = 0;
543
506
break;
544
507
case 132: /* --debug */
545
508
debug = true;
546
509
break;
547
/*
548
* These reproduce what we would get without ARGP_NO_HELP
549
*/
550
case '?': /* --help */
551
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
552
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
553
case -3: /* --usage */
554
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
555
argp_state_help(state, state->out_stream,
556
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
557
case 'V': /* --version */
558
fprintf(state->out_stream, "%s\n", argp_program_version);
559
exit(EXIT_SUCCESS);
560
break;
561
510
/*
562
511
* When adding more options before this line, remember to also add a
563
512
* "case" to the "parse_opt_config_file" function below.
566
515
/* Cryptsetup always passes an argument, which is an empty
567
516
string if "none" was specified in /etc/crypttab. So if
568
517
argument was empty, we ignore it silently. */
569
if(arg[0] == '\0'){
570
break;
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
571
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
572
524
default:
573
525
return ARGP_ERR_UNKNOWN;
574
526
}
575
return errno; /* Set to 0 at start */
527
return 0;
576
528
}
577
529
578
530
/* This option parser is the same as parse_opt() above, except it
580
532
error_t parse_opt_config_file(int key, char *arg,
581
533
__attribute__((unused))
582
534
struct argp_state *state){
583
errno = 0;
584
535
switch(key){
585
536
case 'g': /* --global-options */
586
537
case 'G': /* --global-env */
593
544
case 129: /* --config-file */
594
545
free(argfile);
595
546
argfile = strdup(arg);
596
if(argfile != NULL){
597
errno = 0;
547
if(argfile == NULL){
548
perror("strdup");
598
549
}
599
550
break;
600
551
case 130: /* --userid */
601
552
case 131: /* --groupid */
602
553
case 132: /* --debug */
603
case '?': /* --help */
604
case -3: /* --usage */
605
case 'V': /* --version */
606
554
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
607
556
break;
608
557
default:
609
558
return ARGP_ERR_UNKNOWN;
610
559
}
611
return errno;
560
return 0;
612
561
}
613
562
614
563
struct argp argp = { .options = options,
618
567
619
568
/* Parse using parse_opt_config_file() in order to get the custom
620
569
config file location, if any. */
621
ret = argp_parse(&argp, argc, argv,
622
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
623
NULL, NULL);
624
switch(ret){
625
case 0:
626
break;
627
case ENOMEM:
628
default:
629
errno = ret;
630
error(0, errno, "argp_parse");
631
exitstatus = EX_OSERR;
632
goto fallback;
633
case EINVAL:
634
exitstatus = EX_USAGE;
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
635
574
goto fallback;
636
575
}
637
576
654
593
custom_argc = 1;
655
594
custom_argv = malloc(sizeof(char*) * 2);
656
595
if(custom_argv == NULL){
657
error(0, errno, "malloc");
658
exitstatus = EX_OSERR;
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
659
598
goto fallback;
660
599
}
661
600
custom_argv[0] = argv[0];
677
616
}
678
617
new_arg = strdup(p);
679
618
if(new_arg == NULL){
680
error(0, errno, "strdup");
681
exitstatus = EX_OSERR;
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
682
621
free(org_line);
683
622
goto fallback;
684
623
}
685
624
686
625
custom_argc += 1;
687
{
688
char **new_argv = realloc(custom_argv, sizeof(char *)
689
* ((unsigned int)
690
custom_argc + 1));
691
if(new_argv == NULL){
692
error(0, errno, "realloc");
693
exitstatus = EX_OSERR;
694
free(new_arg);
695
free(org_line);
696
goto fallback;
697
} else {
698
custom_argv = new_argv;
699
}
626
custom_argv = realloc(custom_argv, sizeof(char *)
627
* ((unsigned int) custom_argc + 1));
628
if(custom_argv == NULL){
629
perror("realloc");
630
exitstatus = EXIT_FAILURE;
631
free(org_line);
632
goto fallback;
700
633
}
701
634
custom_argv[custom_argc-1] = new_arg;
702
635
custom_argv[custom_argc] = NULL;
706
639
ret = fclose(conffp);
707
640
} while(ret == EOF and errno == EINTR);
708
641
if(ret == EOF){
709
error(0, errno, "fclose");
710
exitstatus = EX_IOERR;
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
711
644
goto fallback;
712
645
}
713
646
free(org_line);
715
648
/* Check for harmful errors and go to fallback. Other errors might
716
649
not affect opening plugins */
717
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
718
error(0, errno, "fopen");
719
exitstatus = EX_OSERR;
651
perror("fopen");
652
exitstatus = EXIT_FAILURE;
720
653
goto fallback;
721
654
}
722
655
}
723
/* If there were any arguments from the configuration file, pass
724
them to parser as command line arguments */
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
725
658
if(custom_argv != NULL){
726
ret = argp_parse(&argp, custom_argc, custom_argv,
727
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
728
NULL, NULL);
729
switch(ret){
730
case 0:
731
break;
732
case ENOMEM:
733
default:
734
errno = ret;
735
error(0, errno, "argp_parse");
736
exitstatus = EX_OSERR;
737
goto fallback;
738
case EINVAL:
739
exitstatus = EX_CONFIG;
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
662
fprintf(stderr, "Unknown error while parsing arguments\n");
663
exitstatus = EXIT_FAILURE;
740
664
goto fallback;
741
665
}
742
666
}
743
667
744
668
/* Parse actual command line arguments, to let them override the
745
669
config file */
746
ret = argp_parse(&argp, argc, argv,
747
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
748
NULL, NULL);
749
switch(ret){
750
case 0:
751
break;
752
case ENOMEM:
753
default:
754
errno = ret;
755
error(0, errno, "argp_parse");
756
exitstatus = EX_OSERR;
757
goto fallback;
758
case EINVAL:
759
exitstatus = EX_USAGE;
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
760
674
goto fallback;
761
675
}
762
676
774
688
}
775
689
}
776
690
777
if(getuid() == 0){
778
/* Work around Debian bug #633582:
779
<http://bugs.debian.org/633582> */
780
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
781
if(plugindir_fd == -1){
782
error(0, errno, "open");
783
} else {
784
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
785
if(ret == -1){
786
error(0, errno, "fstat");
787
} else {
788
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
789
ret = fchown(plugindir_fd, uid, gid);
790
if(ret == -1){
791
error(0, errno, "fchown");
792
}
793
}
794
}
795
TEMP_FAILURE_RETRY(close(plugindir_fd));
796
}
797
}
798
799
/* Lower permissions */
800
ret = setgid(gid);
691
/* Strip permissions down to nobody */
692
setgid(gid);
801
693
if(ret == -1){
802
error(0, errno, "setgid");
694
perror("setgid");
803
695
}
804
696
ret = setuid(uid);
805
697
if(ret == -1){
806
error(0, errno, "setuid");
807
}
808
809
/* Open plugin directory with close_on_exec flag */
698
perror("setuid");
699
}
700
701
if(plugindir == NULL){
702
dir = opendir(PDIR);
703
} else {
704
dir = opendir(plugindir);
705
}
706
707
if(dir == NULL){
708
perror("Could not open plugin dir");
709
exitstatus = EXIT_FAILURE;
710
goto fallback;
711
}
712
713
/* Set the FD_CLOEXEC flag on the directory, if possible */
810
714
{
811
int dir_fd = -1;
812
if(plugindir == NULL){
813
dir_fd = open(PDIR, O_RDONLY |
814
#ifdef O_CLOEXEC
815
O_CLOEXEC
816
#else /* not O_CLOEXEC */
817
0
818
#endif /* not O_CLOEXEC */
819
);
820
} else {
821
dir_fd = open(plugindir, O_RDONLY |
822
#ifdef O_CLOEXEC
823
O_CLOEXEC
824
#else /* not O_CLOEXEC */
825
0
826
#endif /* not O_CLOEXEC */
827
);
828
}
829
if(dir_fd == -1){
830
error(0, errno, "Could not open plugin dir");
831
exitstatus = EX_UNAVAILABLE;
832
goto fallback;
833
}
834
835
#ifndef O_CLOEXEC
836
/* Set the FD_CLOEXEC flag on the directory */
837
ret = set_cloexec_flag(dir_fd);
838
if(ret < 0){
839
error(0, errno, "set_cloexec_flag");
840
TEMP_FAILURE_RETRY(close(dir_fd));
841
exitstatus = EX_OSERR;
842
goto fallback;
843
}
844
#endif /* O_CLOEXEC */
845
846
dir = fdopendir(dir_fd);
847
if(dir == NULL){
848
error(0, errno, "Could not open plugin dir");
849
TEMP_FAILURE_RETRY(close(dir_fd));
850
exitstatus = EX_OSERR;
851
goto fallback;
715
int dir_fd = dirfd(dir);
716
if(dir_fd >= 0){
717
ret = set_cloexec_flag(dir_fd);
718
if(ret < 0){
719
perror("set_cloexec_flag");
720
exitstatus = EXIT_FAILURE;
721
goto fallback;
722
}
852
723
}
853
724
}
854
725
863
734
/* All directory entries have been processed */
864
735
if(dirst == NULL){
865
736
if(errno == EBADF){
866
error(0, errno, "readdir");
867
exitstatus = EX_IOERR;
737
perror("readdir");
738
exitstatus = EXIT_FAILURE;
868
739
goto fallback;
869
740
}
870
741
break;
876
747
{
877
748
bool bad_name = false;
878
749
879
const char * const bad_prefixes[] = { ".", "#", NULL };
750
const char const *bad_prefixes[] = { ".", "#", NULL };
880
751
881
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
882
753
".dpkg-old",
883
754
".dpkg-bak",
884
755
".dpkg-divert", NULL };
885
#ifdef __GNUC__
886
#pragma GCC diagnostic push
887
#pragma GCC diagnostic ignored "-Wcast-qual"
888
#endif
889
for(const char **pre = (const char **)bad_prefixes;
890
*pre != NULL; pre++){
891
#ifdef __GNUC__
892
#pragma GCC diagnostic pop
893
#endif
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
894
757
size_t pre_len = strlen(*pre);
895
758
if((d_name_len >= pre_len)
896
759
and strncmp((dirst->d_name), *pre, pre_len) == 0){
905
768
if(bad_name){
906
769
continue;
907
770
}
908
#ifdef __GNUC__
909
#pragma GCC diagnostic push
910
#pragma GCC diagnostic ignored "-Wcast-qual"
911
#endif
912
for(const char **suf = (const char **)bad_suffixes;
913
*suf != NULL; suf++){
914
#ifdef __GNUC__
915
#pragma GCC diagnostic pop
916
#endif
771
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
917
772
size_t suf_len = strlen(*suf);
918
773
if((d_name_len >= suf_len)
919
774
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
942
797
dirst->d_name));
943
798
}
944
799
if(ret < 0){
945
error(0, errno, "asprintf");
800
perror("asprintf");
946
801
continue;
947
802
}
948
803
949
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
950
805
if(ret == -1){
951
error(0, errno, "stat");
806
perror("stat");
952
807
free(filename);
953
808
continue;
954
809
}
966
821
967
822
plugin *p = getplugin(dirst->d_name);
968
823
if(p == NULL){
969
error(0, errno, "getplugin");
824
perror("getplugin");
970
825
free(filename);
971
826
continue;
972
827
}
984
839
if(g != NULL){
985
840
for(char **a = g->argv + 1; *a != NULL; a++){
986
841
if(not add_argument(p, *a)){
987
error(0, errno, "add_argument");
842
perror("add_argument");
988
843
}
989
844
}
990
845
/* Add global environment variables */
991
846
for(char **e = g->environ; *e != NULL; e++){
992
847
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
848
perror("add_environment");
994
849
}
995
850
}
996
851
}
1001
856
if(p->environ[0] != NULL){
1002
857
for(char **e = environ; *e != NULL; e++){
1003
858
if(not add_environment(p, *e, false)){
1004
error(0, errno, "add_environment");
859
perror("add_environment");
1005
860
}
1006
861
}
1007
862
}
1009
864
int pipefd[2];
1010
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1011
866
if(ret == -1){
1012
error(0, errno, "pipe");
1013
exitstatus = EX_OSERR;
867
perror("pipe");
868
exitstatus = EXIT_FAILURE;
1014
869
goto fallback;
1015
870
}
1016
871
/* Ask OS to automatic close the pipe on exec */
1017
872
ret = set_cloexec_flag(pipefd[0]);
1018
873
if(ret < 0){
1019
error(0, errno, "set_cloexec_flag");
1020
exitstatus = EX_OSERR;
874
perror("set_cloexec_flag");
875
exitstatus = EXIT_FAILURE;
1021
876
goto fallback;
1022
877
}
1023
878
ret = set_cloexec_flag(pipefd[1]);
1024
879
if(ret < 0){
1025
error(0, errno, "set_cloexec_flag");
1026
exitstatus = EX_OSERR;
880
perror("set_cloexec_flag");
881
exitstatus = EXIT_FAILURE;
1027
882
goto fallback;
1028
883
}
1029
884
/* Block SIGCHLD until process is safely in process list */
1031
886
&sigchld_action.sa_mask,
1032
887
NULL));
1033
888
if(ret < 0){
1034
error(0, errno, "sigprocmask");
1035
exitstatus = EX_OSERR;
889
perror("sigprocmask");
890
exitstatus = EXIT_FAILURE;
1036
891
goto fallback;
1037
892
}
1038
893
/* Starting a new process to be watched */
1041
896
pid = fork();
1042
897
} while(pid == -1 and errno == EINTR);
1043
898
if(pid == -1){
1044
error(0, errno, "fork");
1045
exitstatus = EX_OSERR;
899
perror("fork");
900
exitstatus = EXIT_FAILURE;
1046
901
goto fallback;
1047
902
}
1048
903
if(pid == 0){
1049
904
/* this is the child process */
1050
905
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
906
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
907
perror("sigaction");
908
_exit(EXIT_FAILURE);
1054
909
}
1055
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
911
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
912
perror("sigprocmask");
913
_exit(EXIT_FAILURE);
1059
914
}
1060
915
1061
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
917
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
918
perror("dup2");
919
_exit(EXIT_FAILURE);
1065
920
}
1066
921
1067
922
if(dirfd(dir) < 0){
1071
926
}
1072
927
if(p->environ[0] == NULL){
1073
928
if(execv(filename, p->argv) < 0){
1074
error(0, errno, "execv for %s", filename);
1075
_exit(EX_OSERR);
929
perror("execv");
930
_exit(EXIT_FAILURE);
1076
931
}
1077
932
} else {
1078
933
if(execve(filename, p->argv, p->environ) < 0){
1079
error(0, errno, "execve for %s", filename);
1080
_exit(EX_OSERR);
934
perror("execve");
935
_exit(EXIT_FAILURE);
1081
936
}
1082
937
}
1083
938
/* no return */
1088
943
free(filename);
1089
944
plugin *new_plugin = getplugin(dirst->d_name);
1090
945
if(new_plugin == NULL){
1091
error(0, errno, "getplugin");
946
perror("getplugin");
1092
947
ret = (int)(TEMP_FAILURE_RETRY
1093
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1094
949
NULL)));
1095
950
if(ret < 0){
1096
error(0, errno, "sigprocmask");
951
perror("sigprocmask");
1097
952
}
1098
exitstatus = EX_OSERR;
953
exitstatus = EXIT_FAILURE;
1099
954
goto fallback;
1100
955
}
1101
956
1108
963
&sigchld_action.sa_mask,
1109
964
NULL));
1110
965
if(ret < 0){
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
966
perror("sigprocmask");
967
exitstatus = EXIT_FAILURE;
1113
968
goto fallback;
1114
969
}
1115
970
1116
#if defined (__GNUC__) and defined (__GLIBC__)
1117
#if not __GLIBC_PREREQ(2, 16)
1118
#pragma GCC diagnostic push
1119
#pragma GCC diagnostic ignored "-Wsign-conversion"
1120
#endif
1121
#endif
1122
971
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1123
-Wconversion in GNU libc
1124
before 2.16 */
1125
#if defined (__GNUC__) and defined (__GLIBC__)
1126
#if not __GLIBC_PREREQ(2, 16)
1127
#pragma GCC diagnostic pop
1128
#endif
1129
#endif
972
-Wconversion */
1130
973
1131
974
if(maxfd < new_plugin->fd){
1132
975
maxfd = new_plugin->fd;
1153
996
fd_set rfds = rfds_all;
1154
997
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1155
998
if(select_ret == -1 and errno != EINTR){
1156
error(0, errno, "select");
1157
exitstatus = EX_OSERR;
999
perror("select");
1000
exitstatus = EXIT_FAILURE;
1158
1001
goto fallback;
1159
1002
}
1160
1003
/* OK, now either a process completed, or something can be read
1186
1029
}
1187
1030
1188
1031
/* Remove the plugin */
1189
#if defined (__GNUC__) and defined (__GLIBC__)
1190
#if not __GLIBC_PREREQ(2, 16)
1191
#pragma GCC diagnostic push
1192
#pragma GCC diagnostic ignored "-Wsign-conversion"
1193
#endif
1194
#endif
1195
1032
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1196
-Wconversion in GNU libc
1197
before 2.16 */
1198
#if defined (__GNUC__) and defined (__GLIBC__)
1199
#if not __GLIBC_PREREQ(2, 16)
1200
#pragma GCC diagnostic pop
1201
#endif
1202
#endif
1033
-Wconversion */
1203
1034
1204
1035
/* Block signal while modifying process_list */
1205
1036
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1207
1038
&sigchld_action.sa_mask,
1208
1039
NULL));
1209
1040
if(ret < 0){
1210
error(0, errno, "sigprocmask");
1211
exitstatus = EX_OSERR;
1041
perror("sigprocmask");
1042
exitstatus = EXIT_FAILURE;
1212
1043
goto fallback;
1213
1044
}
1214
1045
1221
1052
(sigprocmask(SIG_UNBLOCK,
1222
1053
&sigchld_action.sa_mask, NULL)));
1223
1054
if(ret < 0){
1224
error(0, errno, "sigprocmask");
1225
exitstatus = EX_OSERR;
1055
perror("sigprocmask");
1056
exitstatus = EXIT_FAILURE;
1226
1057
goto fallback;
1227
1058
}
1228
1059
1238
1069
bool bret = print_out_password(proc->buffer,
1239
1070
proc->buffer_length);
1240
1071
if(not bret){
1241
error(0, errno, "print_out_password");
1242
exitstatus = EX_IOERR;
1072
perror("print_out_password");
1073
exitstatus = EXIT_FAILURE;
1243
1074
}
1244
1075
goto fallback;
1245
1076
}
1246
1077
1247
1078
/* This process has not completed. Does it have any output? */
1248
#if defined (__GNUC__) and defined (__GLIBC__)
1249
#if not __GLIBC_PREREQ(2, 16)
1250
#pragma GCC diagnostic push
1251
#pragma GCC diagnostic ignored "-Wsign-conversion"
1252
#endif
1253
#endif
1254
1079
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1255
1080
warning from
1256
-Wconversion
1257
in GNU libc
1258
before
1259
2.16 */
1260
#if defined (__GNUC__) and defined (__GLIBC__)
1261
#if not __GLIBC_PREREQ(2, 16)
1262
#pragma GCC diagnostic pop
1263
#endif
1264
#endif
1081
-Wconversion */
1265
1082
/* This process had nothing to say at this time */
1266
1083
proc = proc->next;
1267
1084
continue;
1268
1085
}
1269
1086
/* Before reading, make the process' data buffer large enough */
1270
1087
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1271
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1272
+ (size_t) BUFFER_SIZE);
1273
if(new_buffer == NULL){
1274
error(0, errno, "malloc");
1275
exitstatus = EX_OSERR;
1088
proc->buffer = realloc(proc->buffer, proc->buffer_size
1089
+ (size_t) BUFFER_SIZE);
1090
if(proc->buffer == NULL){
1091
perror("malloc");
1092
exitstatus = EXIT_FAILURE;
1276
1093
goto fallback;
1277
1094
}
1278
proc->buffer = new_buffer;
1279
1095
proc->buffer_size += BUFFER_SIZE;
1280
1096
}
1281
1097
/* Read from the process */
1300
1116
1301
1117
fallback:
1302
1118
1303
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1304
and exitstatus != EX_OK)){
1119
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1305
1120
/* Fallback if all plugins failed, none are found or an error
1306
1121
occured */
1307
1122
bool bret;
1315
1130
}
1316
1131
bret = print_out_password(passwordbuffer, len);
1317
1132
if(not bret){
1318
error(0, errno, "print_out_password");
1319
exitstatus = EX_IOERR;
1133
perror("print_out_password");
1134
exitstatus = EXIT_FAILURE;
1320
1135
}
1321
1136
}
1322
1137
1323
1138
/* Restore old signal handler */
1324
1139
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1325
1140
if(ret == -1){
1326
error(0, errno, "sigaction");
1327
exitstatus = EX_OSERR;
1141
perror("sigaction");
1142
exitstatus = EXIT_FAILURE;
1328
1143
}
1329
1144
1330
1145
if(custom_argv != NULL){
1345
1160
ret = kill(p->pid, SIGTERM);
1346
1161
if(ret == -1 and errno != ESRCH){
1347
1162
/* Set-uid proccesses might not get closed */
1348
error(0, errno, "kill");
1163
perror("kill");
1349
1164
}
1350
1165
}
1351
1166
}
1355
1170
ret = wait(NULL);
1356
1171
} while(ret >= 0);
1357
1172
if(errno != ECHILD){
1358
error(0, errno, "wait");
1173
perror("wait");
1359
1174
}
1360
1175
1361
1176
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0