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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:20:46 UTC
- mto: (24.1.140 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090905172046-s92efz3m1j4c1sti
* plugins-runner.c (main): Bug fix: Close config file.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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(),
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
55
FD_CLOEXEC */
56
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
57
strsignal() */
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() */
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 */
106
102
/* Gets an existing plugin based on name,
107
103
or if none is found, creates a new one */
108
104
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
105
/* Check for exiting plugin with that name */
110
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
107
if((p->name == name)
112
108
or (p->name and name and (strcmp(p->name, name) == 0))){
114
110
}
115
111
}
116
112
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
113
plugin *new_plugin = malloc(sizeof(plugin));
121
114
if(new_plugin == NULL){
122
115
return NULL;
123
116
}
124
117
char *copy_name = NULL;
125
118
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
119
copy_name = strdup(name);
129
120
if(copy_name == NULL){
130
int e = errno;
131
121
free(new_plugin);
132
errno = e;
133
122
return NULL;
134
123
}
135
124
}
139
128
.disabled = false,
140
129
.next = plugin_list };
141
130
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
131
new_plugin->argv = malloc(sizeof(char *) * 2);
145
132
if(new_plugin->argv == NULL){
146
int e = errno;
147
133
free(copy_name);
148
134
free(new_plugin);
149
errno = e;
150
135
return NULL;
151
136
}
152
137
new_plugin->argv[0] = copy_name;
153
138
new_plugin->argv[1] = NULL;
154
139
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
140
new_plugin->environ = malloc(sizeof(char *));
158
141
if(new_plugin->environ == NULL){
159
int e = errno;
160
142
free(copy_name);
161
143
free(new_plugin->argv);
162
144
free(new_plugin);
163
errno = e;
164
145
return NULL;
165
146
}
166
147
new_plugin->environ[0] = NULL;
174
155
static bool add_to_char_array(const char *new, char ***array,
175
156
int *len){
176
157
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
181
160
/* Malloc check */
182
161
if(*array == NULL){
183
162
return false;
184
163
}
185
164
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
165
char *copy = strdup(new);
190
166
if(copy == NULL){
191
167
return false;
192
168
}
218
194
if(strncmp(*e, def, namelen + 1) == 0){
219
195
/* It already exists */
220
196
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
197
char *new = realloc(*e, strlen(def) + 1);
225
198
if(new == NULL){
226
199
return false;
227
200
}
240
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
241
214
*/
242
215
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
216
int ret = fcntl(fd, F_GETFD, 0);
244
217
/* If reading the flags failed, return error indication now. */
245
218
if(ret < 0){
246
219
return ret;
247
220
}
248
221
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
223
}
252
224
253
225
268
240
/* No child processes */
269
241
break;
270
242
}
271
error(0, errno, "waitpid");
243
perror("waitpid");
272
244
}
273
245
274
246
/* A child exited, find it in process_list */
345
317
fd_set rfds_all;
346
318
int ret, maxfd = 0;
347
319
ssize_t sret;
320
intmax_t tmpmax;
348
321
uid_t uid = 65534;
349
322
gid_t gid = 65534;
350
323
bool debug = false;
359
332
sigemptyset(&sigchld_action.sa_mask);
360
333
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
334
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
335
perror("sigaddset");
336
exitstatus = EXIT_FAILURE;
364
337
goto fallback;
365
338
}
366
339
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
340
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
341
perror("sigaction");
342
exitstatus = EXIT_FAILURE;
370
343
goto fallback;
371
344
}
372
345
404
377
.doc = "Group ID the plugins will run as", .group = 3 },
405
378
{ .name = "debug", .key = 132,
406
379
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
416
380
{ .name = NULL }
417
381
};
418
382
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
421
386
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
387
case 'g': /* --global-options */
425
{
388
if(arg != NULL){
426
389
char *plugin_option;
427
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
428
394
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
430
397
}
431
398
}
432
399
}
433
400
break;
434
401
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
436
408
break;
437
409
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
456
420
}
457
421
}
458
422
}
459
423
break;
460
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
461
428
{
462
429
char *envdef = strchr(arg, ':');
463
430
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
431
break;
467
432
}
468
433
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
474
436
}
475
add_environment(getplugin(arg), envdef, true);
476
437
}
477
438
break;
478
439
case 'd': /* --disable */
479
{
440
if(arg != NULL){
480
441
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
483
444
}
445
p->disabled = true;
484
446
}
485
447
break;
486
448
case 'e': /* --enable */
487
{
449
if(arg != NULL){
488
450
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
491
453
}
454
p->disabled = false;
492
455
}
493
456
break;
494
457
case 128: /* --plugin-dir */
495
458
free(plugindir);
496
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
497
463
break;
498
464
case 129: /* --config-file */
499
465
/* This is already done by parse_opt_config_file() */
500
466
break;
501
467
case 130: /* --userid */
468
errno = 0;
502
469
tmpmax = strtoimax(arg, &tmp, 10);
503
470
if(errno != 0 or tmp == arg or *tmp != '\0'
504
471
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
508
476
}
509
uid = (uid_t)tmpmax;
510
477
break;
511
478
case 131: /* --groupid */
479
errno = 0;
512
480
tmpmax = strtoimax(arg, &tmp, 10);
513
481
if(errno != 0 or tmp == arg or *tmp != '\0'
514
482
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
518
487
}
519
gid = (gid_t)tmpmax;
520
488
break;
521
489
case 132: /* --debug */
522
490
debug = true;
523
491
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
492
/*
539
493
* When adding more options before this line, remember to also add a
540
494
* "case" to the "parse_opt_config_file" function below.
543
497
/* Cryptsetup always passes an argument, which is an empty
544
498
string if "none" was specified in /etc/crypttab. So if
545
499
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
549
506
default:
550
507
return ARGP_ERR_UNKNOWN;
551
508
}
552
return errno; /* Set to 0 at start */
509
return 0;
553
510
}
554
511
555
512
/* This option parser is the same as parse_opt() above, except it
557
514
error_t parse_opt_config_file(int key, char *arg,
558
515
__attribute__((unused))
559
516
struct argp_state *state){
560
errno = 0;
561
517
switch(key){
562
518
case 'g': /* --global-options */
563
519
case 'G': /* --global-env */
570
526
case 129: /* --config-file */
571
527
free(argfile);
572
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
573
532
break;
574
533
case 130: /* --userid */
575
534
case 131: /* --groupid */
576
535
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
581
538
break;
582
539
default:
583
540
return ARGP_ERR_UNKNOWN;
584
541
}
585
return errno;
542
return 0;
586
543
}
587
544
588
545
struct argp argp = { .options = options,
592
549
593
550
/* Parse using parse_opt_config_file() in order to get the custom
594
551
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
554
fprintf(stderr, "Unknown error while parsing arguments\n");
555
exitstatus = EXIT_FAILURE;
609
556
goto fallback;
610
557
}
611
558
628
575
custom_argc = 1;
629
576
custom_argv = malloc(sizeof(char*) * 2);
630
577
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
633
580
goto fallback;
634
581
}
635
582
custom_argv[0] = argv[0];
651
598
}
652
599
new_arg = strdup(p);
653
600
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
656
603
free(org_line);
657
604
goto fallback;
658
605
}
661
608
custom_argv = realloc(custom_argv, sizeof(char *)
662
609
* ((unsigned int) custom_argc + 1));
663
610
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
666
613
free(org_line);
667
614
goto fallback;
668
615
}
670
617
custom_argv[custom_argc] = NULL;
671
618
}
672
619
}
673
do {
620
do{
674
621
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
622
}while(ret == EOF and errno == EINTR);
676
623
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
679
626
goto fallback;
680
627
}
681
628
free(org_line);
683
630
/* Check for harmful errors and go to fallback. Other errors might
684
631
not affect opening plugins */
685
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
633
perror("fopen");
634
exitstatus = EXIT_FAILURE;
688
635
goto fallback;
689
636
}
690
637
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
638
/* If there was any arguments from configuration file,
639
pass them to parser as command arguments */
693
640
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
708
646
goto fallback;
709
647
}
710
648
}
711
649
712
650
/* Parse actual command line arguments, to let them override the
713
651
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
exitstatus = EXIT_FAILURE;
728
656
goto fallback;
729
657
}
730
658
742
670
}
743
671
}
744
672
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
673
/* Strip permissions down to nobody */
768
674
setgid(gid);
769
675
if(ret == -1){
770
error(0, errno, "setgid");
676
perror("setgid");
771
677
}
772
678
ret = setuid(uid);
773
679
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
680
perror("setuid");
681
}
682
683
if(plugindir == NULL){
684
dir = opendir(PDIR);
685
} else {
686
dir = opendir(plugindir);
687
}
688
689
if(dir == NULL){
690
perror("Could not open plugin dir");
691
exitstatus = EXIT_FAILURE;
692
goto fallback;
693
}
694
695
/* Set the FD_CLOEXEC flag on the directory, if possible */
778
696
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
697
int dir_fd = dirfd(dir);
698
if(dir_fd >= 0){
699
ret = set_cloexec_flag(dir_fd);
700
if(ret < 0){
701
perror("set_cloexec_flag");
702
exitstatus = EXIT_FAILURE;
703
goto fallback;
704
}
820
705
}
821
706
}
822
707
824
709
825
710
/* Read and execute any executable in the plugin directory*/
826
711
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
712
dirst = readdir(dir);
830
713
831
714
/* All directory entries have been processed */
832
715
if(dirst == NULL){
833
716
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
717
perror("readdir");
718
exitstatus = EXIT_FAILURE;
836
719
goto fallback;
837
720
}
838
721
break;
868
751
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
752
size_t suf_len = strlen(*suf);
870
753
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
754
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
872
755
== 0)){
873
756
if(debug){
874
757
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
769
887
770
char *filename;
888
771
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
891
773
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
895
775
}
896
776
if(ret < 0){
897
error(0, errno, "asprintf");
777
perror("asprintf");
898
778
continue;
899
779
}
900
780
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
781
ret = stat(filename, &st);
902
782
if(ret == -1){
903
error(0, errno, "stat");
783
perror("stat");
904
784
free(filename);
905
785
continue;
906
786
}
907
787
908
788
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
911
790
if(debug){
912
791
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
792
" with bad type or mode\n", filename);
918
797
919
798
plugin *p = getplugin(dirst->d_name);
920
799
if(p == NULL){
921
error(0, errno, "getplugin");
800
perror("getplugin");
922
801
free(filename);
923
802
continue;
924
803
}
936
815
if(g != NULL){
937
816
for(char **a = g->argv + 1; *a != NULL; a++){
938
817
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
818
perror("add_argument");
940
819
}
941
820
}
942
821
/* Add global environment variables */
943
822
for(char **e = g->environ; *e != NULL; e++){
944
823
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
824
perror("add_environment");
946
825
}
947
826
}
948
827
}
953
832
if(p->environ[0] != NULL){
954
833
for(char **e = environ; *e != NULL; e++){
955
834
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
835
perror("add_environment");
957
836
}
958
837
}
959
838
}
960
839
961
840
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
841
ret = pipe(pipefd);
963
842
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
843
perror("pipe");
844
exitstatus = EXIT_FAILURE;
966
845
goto fallback;
967
846
}
968
847
/* Ask OS to automatic close the pipe on exec */
969
848
ret = set_cloexec_flag(pipefd[0]);
970
849
if(ret < 0){
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
850
perror("set_cloexec_flag");
851
exitstatus = EXIT_FAILURE;
973
852
goto fallback;
974
853
}
975
854
ret = set_cloexec_flag(pipefd[1]);
976
855
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
856
perror("set_cloexec_flag");
857
exitstatus = EXIT_FAILURE;
979
858
goto fallback;
980
859
}
981
860
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
862
if(ret < 0){
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
863
perror("sigprocmask");
864
exitstatus = EXIT_FAILURE;
988
865
goto fallback;
989
866
}
990
867
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
868
pid_t pid = fork();
995
869
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
870
perror("fork");
871
exitstatus = EXIT_FAILURE;
998
872
goto fallback;
999
873
}
1000
874
if(pid == 0){
1001
875
/* this is the child process */
1002
876
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
877
if(ret < 0){
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
878
perror("sigaction");
879
_exit(EXIT_FAILURE);
1006
880
}
1007
881
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1008
882
if(ret < 0){
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
883
perror("sigprocmask");
884
_exit(EXIT_FAILURE);
1011
885
}
1012
886
1013
887
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
888
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
889
perror("dup2");
890
_exit(EXIT_FAILURE);
1017
891
}
1018
892
1019
893
if(dirfd(dir) < 0){
1023
897
}
1024
898
if(p->environ[0] == NULL){
1025
899
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
900
perror("execv");
901
_exit(EXIT_FAILURE);
1028
902
}
1029
903
} else {
1030
904
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
905
perror("execve");
906
_exit(EXIT_FAILURE);
1033
907
}
1034
908
}
1035
909
/* no return */
1036
910
}
1037
911
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
912
close(pipefd[1]); /* Close unused write end of pipe */
1040
913
free(filename);
1041
914
plugin *new_plugin = getplugin(dirst->d_name);
1042
915
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1047
918
if(ret < 0){
1048
error(0, errno, "sigprocmask");
919
perror("sigprocmask");
1049
920
}
1050
exitstatus = EX_OSERR;
921
exitstatus = EXIT_FAILURE;
1051
922
goto fallback;
1052
923
}
1053
924
1056
927
1057
928
/* Unblock SIGCHLD so signal handler can be run if this process
1058
929
has already completed */
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
931
if(ret < 0){
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
932
perror("sigprocmask");
933
exitstatus = EXIT_FAILURE;
1065
934
goto fallback;
1066
935
}
1067
936
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
937
FD_SET(new_plugin->fd, &rfds_all);
1070
938
1071
939
if(maxfd < new_plugin->fd){
1072
940
maxfd = new_plugin->fd;
1073
941
}
1074
942
}
1075
943
1076
TEMP_FAILURE_RETRY(closedir(dir));
944
closedir(dir);
1077
945
dir = NULL;
1078
946
free_plugin(getplugin(NULL));
1079
947
1092
960
while(plugin_list){
1093
961
fd_set rfds = rfds_all;
1094
962
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
963
if(select_ret == -1){
964
perror("select");
965
exitstatus = EXIT_FAILURE;
1098
966
goto fallback;
1099
967
}
1100
968
/* OK, now either a process completed, or something can be read
1126
994
}
1127
995
1128
996
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
997
FD_CLR(proc->fd, &rfds_all);
1131
998
1132
999
/* Block signal while modifying process_list */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1137
1001
if(ret < 0){
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1140
1004
goto fallback;
1141
1005
}
1142
1006
1145
1009
proc = next_plugin;
1146
1010
1147
1011
/* We are done modifying process list, so unblock signal */
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
1151
1014
if(ret < 0){
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1015
perror("sigprocmask");
1016
exitstatus = EXIT_FAILURE;
1154
1017
goto fallback;
1155
1018
}
1156
1019
1166
1029
bool bret = print_out_password(proc->buffer,
1167
1030
proc->buffer_length);
1168
1031
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1032
perror("print_out_password");
1033
exitstatus = EXIT_FAILURE;
1171
1034
}
1172
1035
goto fallback;
1173
1036
}
1174
1037
1175
1038
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1039
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
1040
/* This process had nothing to say at this time */
1180
1041
proc = proc->next;
1181
1042
continue;
1185
1046
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
1047
+ (size_t) BUFFER_SIZE);
1187
1048
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1049
perror("malloc");
1050
exitstatus = EXIT_FAILURE;
1190
1051
goto fallback;
1191
1052
}
1192
1053
proc->buffer_size += BUFFER_SIZE;
1193
1054
}
1194
1055
/* Read from the process */
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1199
1058
if(sret < 0){
1200
1059
/* Read error from this process; ignore the error */
1201
1060
proc = proc->next;
1213
1072
1214
1073
fallback:
1215
1074
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1218
1076
/* Fallback if all plugins failed, none are found or an error
1219
1077
occured */
1220
1078
bool bret;
1228
1086
}
1229
1087
bret = print_out_password(passwordbuffer, len);
1230
1088
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1089
perror("print_out_password");
1090
exitstatus = EXIT_FAILURE;
1233
1091
}
1234
1092
}
1235
1093
1236
1094
/* Restore old signal handler */
1237
1095
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
1096
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1097
perror("sigaction");
1098
exitstatus = EXIT_FAILURE;
1241
1099
}
1242
1100
1243
1101
if(custom_argv != NULL){
1258
1116
ret = kill(p->pid, SIGTERM);
1259
1117
if(ret == -1 and errno != ESRCH){
1260
1118
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1119
perror("kill");
1262
1120
}
1263
1121
}
1264
1122
}
1265
1123
1266
1124
/* Wait for any remaining child processes to terminate */
1267
do {
1125
do{
1268
1126
ret = wait(NULL);
1269
1127
} while(ret >= 0);
1270
1128
if(errno != ECHILD){
1271
error(0, errno, "wait");
1129
perror("wait");
1272
1130
}
1273
1131
1274
1132
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0