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- Committer: Teddy Hogeborn
- Date: 2011-10-09 19:30:34 UTC
- mfrom: (514 trunk)
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 515.
- Revision ID: teddy@recompile.se-20111009193034-nkkmc6j05jkbdodx
Merge from trunk.
- files added:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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))){
110
114
}
111
115
}
112
116
/* Create a new plugin */
113
plugin *new_plugin = malloc(sizeof(plugin));
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
114
121
if(new_plugin == NULL){
115
122
return NULL;
116
123
}
117
124
char *copy_name = NULL;
118
125
if(name != NULL){
119
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
120
129
if(copy_name == NULL){
130
int e = errno;
121
131
free(new_plugin);
132
errno = e;
122
133
return NULL;
123
134
}
124
135
}
128
139
.disabled = false,
129
140
.next = plugin_list };
130
141
131
new_plugin->argv = malloc(sizeof(char *) * 2);
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
132
145
if(new_plugin->argv == NULL){
146
int e = errno;
133
147
free(copy_name);
134
148
free(new_plugin);
149
errno = e;
135
150
return NULL;
136
151
}
137
152
new_plugin->argv[0] = copy_name;
138
153
new_plugin->argv[1] = NULL;
139
154
140
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
141
158
if(new_plugin->environ == NULL){
159
int e = errno;
142
160
free(copy_name);
143
161
free(new_plugin->argv);
144
162
free(new_plugin);
163
errno = e;
145
164
return NULL;
146
165
}
147
166
new_plugin->environ[0] = NULL;
155
174
static bool add_to_char_array(const char *new, char ***array,
156
175
int *len){
157
176
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
160
181
/* Malloc check */
161
182
if(*array == NULL){
162
183
return false;
163
184
}
164
185
/* Make a copy of the new string */
165
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
166
190
if(copy == NULL){
167
191
return false;
168
192
}
194
218
if(strncmp(*e, def, namelen + 1) == 0){
195
219
/* It already exists */
196
220
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
198
225
if(new == NULL){
199
226
return false;
200
227
}
210
237
/*
211
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
239
* Descriptor Flags".
213
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
214
241
*/
215
242
static int set_cloexec_flag(int fd){
216
int ret = fcntl(fd, F_GETFD, 0);
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
217
244
/* If reading the flags failed, return error indication now. */
218
245
if(ret < 0){
219
246
return ret;
220
247
}
221
248
/* Store modified flag word in the descriptor. */
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
223
251
}
224
252
225
253
240
268
/* No child processes */
241
269
break;
242
270
}
243
perror("waitpid");
271
error(0, errno, "waitpid");
244
272
}
245
273
246
274
/* A child exited, find it in process_list */
317
345
fd_set rfds_all;
318
346
int ret, maxfd = 0;
319
347
ssize_t sret;
320
intmax_t tmpmax;
321
348
uid_t uid = 65534;
322
349
gid_t gid = 65534;
323
350
bool debug = false;
332
359
sigemptyset(&sigchld_action.sa_mask);
333
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
334
361
if(ret == -1){
335
perror("sigaddset");
336
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
337
364
goto fallback;
338
365
}
339
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
340
367
if(ret == -1){
341
perror("sigaction");
342
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
343
370
goto fallback;
344
371
}
345
372
377
404
.doc = "Group ID the plugins will run as", .group = 3 },
378
405
{ .name = "debug", .key = 132,
379
406
.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 },
380
416
{ .name = NULL }
381
417
};
382
418
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
386
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
387
424
case 'g': /* --global-options */
388
if(arg != NULL){
425
{
389
426
char *plugin_option;
390
427
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
394
428
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
429
break;
397
430
}
398
431
}
399
432
}
400
433
break;
401
434
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
435
add_environment(getplugin(NULL), arg, true);
408
436
break;
409
437
case 'o': /* --options-for */
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;
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;
420
456
}
421
457
}
422
458
}
423
459
break;
424
460
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
461
{
429
462
char *envdef = strchr(arg, ':');
430
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
431
466
break;
432
467
}
433
468
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
436
474
}
475
add_environment(getplugin(arg), envdef, true);
437
476
}
438
477
break;
439
478
case 'd': /* --disable */
440
if(arg != NULL){
479
{
441
480
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
444
483
}
445
p->disabled = true;
446
484
}
447
485
break;
448
486
case 'e': /* --enable */
449
if(arg != NULL){
487
{
450
488
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
453
491
}
454
p->disabled = false;
455
492
}
456
493
break;
457
494
case 128: /* --plugin-dir */
458
495
free(plugindir);
459
496
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
497
break;
464
498
case 129: /* --config-file */
465
499
/* This is already done by parse_opt_config_file() */
466
500
break;
467
501
case 130: /* --userid */
468
errno = 0;
469
502
tmpmax = strtoimax(arg, &tmp, 10);
470
503
if(errno != 0 or tmp == arg or *tmp != '\0'
471
504
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
476
508
}
509
uid = (uid_t)tmpmax;
477
510
break;
478
511
case 131: /* --groupid */
479
errno = 0;
480
512
tmpmax = strtoimax(arg, &tmp, 10);
481
513
if(errno != 0 or tmp == arg or *tmp != '\0'
482
514
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
487
518
}
519
gid = (gid_t)tmpmax;
488
520
break;
489
521
case 132: /* --debug */
490
522
debug = true;
491
523
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;
492
538
/*
493
539
* When adding more options before this line, remember to also add a
494
540
* "case" to the "parse_opt_config_file" function below.
497
543
/* Cryptsetup always passes an argument, which is an empty
498
544
string if "none" was specified in /etc/crypttab. So if
499
545
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
502
548
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
549
default:
507
550
return ARGP_ERR_UNKNOWN;
508
551
}
509
return 0;
552
return errno; /* Set to 0 at start */
510
553
}
511
554
512
555
/* This option parser is the same as parse_opt() above, except it
514
557
error_t parse_opt_config_file(int key, char *arg,
515
558
__attribute__((unused))
516
559
struct argp_state *state){
560
errno = 0;
517
561
switch(key){
518
562
case 'g': /* --global-options */
519
563
case 'G': /* --global-env */
526
570
case 129: /* --config-file */
527
571
free(argfile);
528
572
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
573
break;
533
574
case 130: /* --userid */
534
575
case 131: /* --groupid */
535
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
536
580
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
581
break;
539
582
default:
540
583
return ARGP_ERR_UNKNOWN;
541
584
}
542
return 0;
585
return errno;
543
586
}
544
587
545
588
struct argp argp = { .options = options,
549
592
550
593
/* Parse using parse_opt_config_file() in order to get the custom
551
594
config file location, if any. */
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;
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;
556
609
goto fallback;
557
610
}
558
611
575
628
custom_argc = 1;
576
629
custom_argv = malloc(sizeof(char*) * 2);
577
630
if(custom_argv == NULL){
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
580
633
goto fallback;
581
634
}
582
635
custom_argv[0] = argv[0];
598
651
}
599
652
new_arg = strdup(p);
600
653
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
603
656
free(org_line);
604
657
goto fallback;
605
658
}
608
661
custom_argv = realloc(custom_argv, sizeof(char *)
609
662
* ((unsigned int) custom_argc + 1));
610
663
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
613
666
free(org_line);
614
667
goto fallback;
615
668
}
617
670
custom_argv[custom_argc] = NULL;
618
671
}
619
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
620
681
free(org_line);
621
682
} else {
622
683
/* Check for harmful errors and go to fallback. Other errors might
623
684
not affect opening plugins */
624
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
perror("fopen");
626
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
627
688
goto fallback;
628
689
}
629
690
}
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
632
693
if(custom_argv != NULL){
633
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
0, NULL);
635
if(ret == ARGP_ERR_UNKNOWN){
636
fprintf(stderr, "Unknown error while parsing arguments\n");
637
exitstatus = EXIT_FAILURE;
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;
638
708
goto fallback;
639
709
}
640
710
}
641
711
642
712
/* Parse actual command line arguments, to let them override the
643
713
config file */
644
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
645
if(ret == ARGP_ERR_UNKNOWN){
646
fprintf(stderr, "Unknown error while parsing arguments\n");
647
exitstatus = EXIT_FAILURE;
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;
648
728
goto fallback;
649
729
}
650
730
662
742
}
663
743
}
664
744
665
/* Strip permissions down to nobody */
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 */
666
768
setgid(gid);
667
769
if(ret == -1){
668
perror("setgid");
770
error(0, errno, "setgid");
669
771
}
670
772
ret = setuid(uid);
671
773
if(ret == -1){
672
perror("setuid");
673
}
674
675
if(plugindir == NULL){
676
dir = opendir(PDIR);
677
} else {
678
dir = opendir(plugindir);
679
}
680
681
if(dir == NULL){
682
perror("Could not open plugin dir");
683
exitstatus = EXIT_FAILURE;
684
goto fallback;
685
}
686
687
/* Set the FD_CLOEXEC flag on the directory, if possible */
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
688
778
{
689
int dir_fd = dirfd(dir);
690
if(dir_fd >= 0){
691
ret = set_cloexec_flag(dir_fd);
692
if(ret < 0){
693
perror("set_cloexec_flag");
694
exitstatus = EXIT_FAILURE;
695
goto fallback;
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
820
}
698
821
}
699
822
701
824
702
825
/* Read and execute any executable in the plugin directory*/
703
826
while(true){
704
dirst = readdir(dir);
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
705
830
706
831
/* All directory entries have been processed */
707
832
if(dirst == NULL){
708
833
if(errno == EBADF){
709
perror("readdir");
710
exitstatus = EXIT_FAILURE;
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
711
836
goto fallback;
712
837
}
713
838
break;
743
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
744
869
size_t suf_len = strlen(*suf);
745
870
if((d_name_len >= suf_len)
746
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
747
872
== 0)){
748
873
if(debug){
749
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
761
886
762
887
char *filename;
763
888
if(plugindir == NULL){
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
765
891
} else {
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
767
895
}
768
896
if(ret < 0){
769
perror("asprintf");
897
error(0, errno, "asprintf");
770
898
continue;
771
899
}
772
900
773
ret = stat(filename, &st);
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
774
902
if(ret == -1){
775
perror("stat");
903
error(0, errno, "stat");
776
904
free(filename);
777
905
continue;
778
906
}
779
907
780
908
/* Ignore non-executable files */
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
782
911
if(debug){
783
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
784
913
" with bad type or mode\n", filename);
789
918
790
919
plugin *p = getplugin(dirst->d_name);
791
920
if(p == NULL){
792
perror("getplugin");
921
error(0, errno, "getplugin");
793
922
free(filename);
794
923
continue;
795
924
}
807
936
if(g != NULL){
808
937
for(char **a = g->argv + 1; *a != NULL; a++){
809
938
if(not add_argument(p, *a)){
810
perror("add_argument");
939
error(0, errno, "add_argument");
811
940
}
812
941
}
813
942
/* Add global environment variables */
814
943
for(char **e = g->environ; *e != NULL; e++){
815
944
if(not add_environment(p, *e, false)){
816
perror("add_environment");
945
error(0, errno, "add_environment");
817
946
}
818
947
}
819
948
}
824
953
if(p->environ[0] != NULL){
825
954
for(char **e = environ; *e != NULL; e++){
826
955
if(not add_environment(p, *e, false)){
827
perror("add_environment");
956
error(0, errno, "add_environment");
828
957
}
829
958
}
830
959
}
831
960
832
961
int pipefd[2];
833
ret = pipe(pipefd);
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
834
963
if(ret == -1){
835
perror("pipe");
836
exitstatus = EXIT_FAILURE;
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
837
966
goto fallback;
838
967
}
839
968
/* Ask OS to automatic close the pipe on exec */
840
969
ret = set_cloexec_flag(pipefd[0]);
841
970
if(ret < 0){
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
844
973
goto fallback;
845
974
}
846
975
ret = set_cloexec_flag(pipefd[1]);
847
976
if(ret < 0){
848
perror("set_cloexec_flag");
849
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
850
979
goto fallback;
851
980
}
852
981
/* Block SIGCHLD until process is safely in process list */
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
854
985
if(ret < 0){
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
857
988
goto fallback;
858
989
}
859
990
/* Starting a new process to be watched */
860
pid_t pid = fork();
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
861
995
if(pid == -1){
862
perror("fork");
863
exitstatus = EXIT_FAILURE;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
864
998
goto fallback;
865
999
}
866
1000
if(pid == 0){
867
1001
/* this is the child process */
868
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
869
1003
if(ret < 0){
870
perror("sigaction");
871
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
872
1006
}
873
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
1008
if(ret < 0){
875
perror("sigprocmask");
876
_exit(EXIT_FAILURE);
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
877
1011
}
878
1012
879
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
880
1014
if(ret == -1){
881
perror("dup2");
882
_exit(EXIT_FAILURE);
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
883
1017
}
884
1018
885
1019
if(dirfd(dir) < 0){
889
1023
}
890
1024
if(p->environ[0] == NULL){
891
1025
if(execv(filename, p->argv) < 0){
892
perror("execv");
893
_exit(EXIT_FAILURE);
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
894
1028
}
895
1029
} else {
896
1030
if(execve(filename, p->argv, p->environ) < 0){
897
perror("execve");
898
_exit(EXIT_FAILURE);
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
899
1033
}
900
1034
}
901
1035
/* no return */
902
1036
}
903
1037
/* Parent process */
904
close(pipefd[1]); /* Close unused write end of pipe */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
905
1040
free(filename);
906
1041
plugin *new_plugin = getplugin(dirst->d_name);
907
1042
if(new_plugin == NULL){
908
perror("getplugin");
909
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
910
1047
if(ret < 0){
911
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
912
1049
}
913
exitstatus = EXIT_FAILURE;
1050
exitstatus = EX_OSERR;
914
1051
goto fallback;
915
1052
}
916
1053
919
1056
920
1057
/* Unblock SIGCHLD so signal handler can be run if this process
921
1058
has already completed */
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
923
1062
if(ret < 0){
924
perror("sigprocmask");
925
exitstatus = EXIT_FAILURE;
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
926
1065
goto fallback;
927
1066
}
928
1067
929
FD_SET(new_plugin->fd, &rfds_all);
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
930
1070
931
1071
if(maxfd < new_plugin->fd){
932
1072
maxfd = new_plugin->fd;
933
1073
}
934
1074
}
935
1075
936
closedir(dir);
1076
TEMP_FAILURE_RETRY(closedir(dir));
937
1077
dir = NULL;
938
1078
free_plugin(getplugin(NULL));
939
1079
952
1092
while(plugin_list){
953
1093
fd_set rfds = rfds_all;
954
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
958
1098
goto fallback;
959
1099
}
960
1100
/* OK, now either a process completed, or something can be read
986
1126
}
987
1127
988
1128
/* Remove the plugin */
989
FD_CLR(proc->fd, &rfds_all);
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
990
1131
991
1132
/* Block signal while modifying process_list */
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
993
1137
if(ret < 0){
994
perror("sigprocmask");
995
exitstatus = EXIT_FAILURE;
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
996
1140
goto fallback;
997
1141
}
998
1142
1001
1145
proc = next_plugin;
1002
1146
1003
1147
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
1006
1151
if(ret < 0){
1007
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1009
1154
goto fallback;
1010
1155
}
1011
1156
1021
1166
bool bret = print_out_password(proc->buffer,
1022
1167
proc->buffer_length);
1023
1168
if(not bret){
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1026
1171
}
1027
1172
goto fallback;
1028
1173
}
1029
1174
1030
1175
/* This process has not completed. Does it have any output? */
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1032
1179
/* This process had nothing to say at this time */
1033
1180
proc = proc->next;
1034
1181
continue;
1038
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
1186
+ (size_t) BUFFER_SIZE);
1040
1187
if(proc->buffer == NULL){
1041
perror("malloc");
1042
exitstatus = EXIT_FAILURE;
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1043
1190
goto fallback;
1044
1191
}
1045
1192
proc->buffer_size += BUFFER_SIZE;
1046
1193
}
1047
1194
/* Read from the process */
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1050
1199
if(sret < 0){
1051
1200
/* Read error from this process; ignore the error */
1052
1201
proc = proc->next;
1064
1213
1065
1214
fallback:
1066
1215
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1068
1218
/* Fallback if all plugins failed, none are found or an error
1069
1219
occured */
1070
1220
bool bret;
1078
1228
}
1079
1229
bret = print_out_password(passwordbuffer, len);
1080
1230
if(not bret){
1081
perror("print_out_password");
1082
exitstatus = EXIT_FAILURE;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1083
1233
}
1084
1234
}
1085
1235
1086
1236
/* Restore old signal handler */
1087
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1088
1238
if(ret == -1){
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1091
1241
}
1092
1242
1093
1243
if(custom_argv != NULL){
1108
1258
ret = kill(p->pid, SIGTERM);
1109
1259
if(ret == -1 and errno != ESRCH){
1110
1260
/* Set-uid proccesses might not get closed */
1111
perror("kill");
1261
error(0, errno, "kill");
1112
1262
}
1113
1263
}
1114
1264
}
1115
1265
1116
1266
/* Wait for any remaining child processes to terminate */
1117
do{
1267
do {
1118
1268
ret = wait(NULL);
1119
1269
} while(ret >= 0);
1120
1270
if(errno != ECHILD){
1121
perror("wait");
1271
error(0, errno, "wait");
1122
1272
}
1123
1273
1124
1274
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0