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- Committer: Teddy Hogeborn
- Date: 2009-02-23 11:52:42 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.137 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 252.
- Revision ID: teddy@fukt.bsnet.se-20090223115242-5930ewin7m4o6zpr
* README (The Plugin System): Improve wording.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
68
66
*/
69
67
#include <errno.h> /* errno, EBADF */
70
68
#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
69
76
70
#define BUFFER_SIZE 256
77
71
79
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
74
81
75
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
77
84
78
typedef struct plugin{
85
79
char *name; /* can be NULL or any plugin name */
106
100
/* Gets an existing plugin based on name,
107
101
or if none is found, creates a new one */
108
102
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
103
/* Check for exiting plugin with that name */
110
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
105
if((p->name == name)
112
106
or (p->name and name and (strcmp(p->name, name) == 0))){
114
108
}
115
109
}
116
110
/* 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);
111
plugin *new_plugin = malloc(sizeof(plugin));
121
112
if(new_plugin == NULL){
122
113
return NULL;
123
114
}
124
115
char *copy_name = NULL;
125
116
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
copy_name = strdup(name);
129
118
if(copy_name == NULL){
130
int e = errno;
131
119
free(new_plugin);
132
errno = e;
133
120
return NULL;
134
121
}
135
122
}
139
126
.disabled = false,
140
127
.next = plugin_list };
141
128
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
129
new_plugin->argv = malloc(sizeof(char *) * 2);
145
130
if(new_plugin->argv == NULL){
146
int e = errno;
147
131
free(copy_name);
148
132
free(new_plugin);
149
errno = e;
150
133
return NULL;
151
134
}
152
135
new_plugin->argv[0] = copy_name;
153
136
new_plugin->argv[1] = NULL;
154
137
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
138
new_plugin->environ = malloc(sizeof(char *));
158
139
if(new_plugin->environ == NULL){
159
int e = errno;
160
140
free(copy_name);
161
141
free(new_plugin->argv);
162
142
free(new_plugin);
163
errno = e;
164
143
return NULL;
165
144
}
166
145
new_plugin->environ[0] = NULL;
171
150
}
172
151
173
152
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
153
static bool add_to_char_array(const char *new, char ***array,
176
154
int *len){
177
155
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
182
158
/* Malloc check */
183
159
if(*array == NULL){
184
160
return false;
185
161
}
186
162
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
163
char *copy = strdup(new);
191
164
if(copy == NULL){
192
165
return false;
193
166
}
200
173
}
201
174
202
175
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
176
static bool add_argument(plugin *p, const char *arg){
205
177
if(p == NULL){
206
178
return false;
209
181
}
210
182
211
183
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
184
static bool add_environment(plugin *p, const char *def, bool replace){
214
185
if(p == NULL){
215
186
return false;
221
192
if(strncmp(*e, def, namelen + 1) == 0){
222
193
/* It already exists */
223
194
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
195
char *new = realloc(*e, strlen(def) + 1);
228
196
if(new == NULL){
229
197
return false;
230
198
}
240
208
/*
241
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
210
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
244
212
*/
245
213
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
int ret = fcntl(fd, F_GETFD, 0);
247
215
/* If reading the flags failed, return error indication now. */
248
216
if(ret < 0){
249
217
return ret;
250
218
}
251
219
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
254
221
}
255
222
256
223
271
238
/* No child processes */
272
239
break;
273
240
}
274
error(0, errno, "waitpid");
241
perror("waitpid");
275
242
}
276
243
277
244
/* A child exited, find it in process_list */
289
256
}
290
257
291
258
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
259
static bool print_out_password(const char *buffer, size_t length){
294
260
ssize_t ret;
295
261
for(size_t written = 0; written < length; written += (size_t)ret){
303
269
}
304
270
305
271
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
272
static void free_plugin(plugin *plugin_node){
308
273
309
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
350
315
fd_set rfds_all;
351
316
int ret, maxfd = 0;
352
317
ssize_t sret;
318
intmax_t tmpmax;
353
319
uid_t uid = 65534;
354
320
gid_t gid = 65534;
355
321
bool debug = false;
364
330
sigemptyset(&sigchld_action.sa_mask);
365
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
332
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
369
335
goto fallback;
370
336
}
371
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
338
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
375
341
goto fallback;
376
342
}
377
343
409
375
.doc = "Group ID the plugins will run as", .group = 3 },
410
376
{ .name = "debug", .key = 132,
411
377
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
421
378
{ .name = NULL }
422
379
};
423
380
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
427
384
switch(key){
428
char *tmp;
429
intmax_t tmpmax;
430
385
case 'g': /* --global-options */
431
{
386
if(arg != NULL){
432
387
char *plugin_option;
433
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
390
continue;
391
}
434
392
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
393
perror("add_argument");
394
return ARGP_ERR_UNKNOWN;
436
395
}
437
396
}
438
397
}
439
398
break;
440
399
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
400
if(arg == NULL){
401
break;
402
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
405
}
442
406
break;
443
407
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
462
418
}
463
419
}
464
420
}
465
421
break;
466
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
467
426
{
468
427
char *envdef = strchr(arg, ':');
469
428
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
429
break;
473
430
}
474
431
*envdef = '\0';
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
480
434
}
481
add_environment(getplugin(arg), envdef, true);
482
435
}
483
436
break;
484
437
case 'd': /* --disable */
485
{
438
if(arg != NULL){
486
439
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
489
442
}
443
p->disabled = true;
490
444
}
491
445
break;
492
446
case 'e': /* --enable */
493
{
447
if(arg != NULL){
494
448
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
497
451
}
452
p->disabled = false;
498
453
}
499
454
break;
500
455
case 128: /* --plugin-dir */
501
456
free(plugindir);
502
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
503
461
break;
504
462
case 129: /* --config-file */
505
463
/* This is already done by parse_opt_config_file() */
506
464
break;
507
465
case 130: /* --userid */
466
errno = 0;
508
467
tmpmax = strtoimax(arg, &tmp, 10);
509
468
if(errno != 0 or tmp == arg or *tmp != '\0'
510
469
or tmpmax != (uid_t)tmpmax){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
514
474
}
515
uid = (uid_t)tmpmax;
516
475
break;
517
476
case 131: /* --groupid */
477
errno = 0;
518
478
tmpmax = strtoimax(arg, &tmp, 10);
519
479
if(errno != 0 or tmp == arg or *tmp != '\0'
520
480
or tmpmax != (gid_t)tmpmax){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
524
485
}
525
gid = (gid_t)tmpmax;
526
486
break;
527
487
case 132: /* --debug */
528
488
debug = true;
529
489
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
490
/*
545
491
* When adding more options before this line, remember to also add a
546
492
* "case" to the "parse_opt_config_file" function below.
549
495
/* Cryptsetup always passes an argument, which is an empty
550
496
string if "none" was specified in /etc/crypttab. So if
551
497
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
554
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
555
504
default:
556
505
return ARGP_ERR_UNKNOWN;
557
506
}
558
return errno; /* Set to 0 at start */
507
return 0;
559
508
}
560
509
561
510
/* This option parser is the same as parse_opt() above, except it
563
512
error_t parse_opt_config_file(int key, char *arg,
564
513
__attribute__((unused))
565
514
struct argp_state *state){
566
errno = 0;
567
515
switch(key){
568
516
case 'g': /* --global-options */
569
517
case 'G': /* --global-env */
576
524
case 129: /* --config-file */
577
525
free(argfile);
578
526
argfile = strdup(arg);
579
break;
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
580
531
case 130: /* --userid */
581
532
case 131: /* --groupid */
582
533
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
587
536
break;
588
537
default:
589
538
return ARGP_ERR_UNKNOWN;
590
539
}
591
return errno;
540
return 0;
592
541
}
593
542
594
543
struct argp argp = { .options = options,
598
547
599
548
/* Parse using parse_opt_config_file() in order to get the custom
600
549
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
615
554
goto fallback;
616
555
}
617
556
623
562
conffp = fopen(AFILE, "r");
624
563
} else {
625
564
conffp = fopen(argfile, "r");
626
}
565
}
627
566
if(conffp != NULL){
628
567
char *org_line = NULL;
629
568
char *p, *arg, *new_arg, *line;
634
573
custom_argc = 1;
635
574
custom_argv = malloc(sizeof(char*) * 2);
636
575
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
639
578
goto fallback;
640
579
}
641
580
custom_argv[0] = argv[0];
657
596
}
658
597
new_arg = strdup(p);
659
598
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
662
601
free(org_line);
663
602
goto fallback;
664
603
}
667
606
custom_argv = realloc(custom_argv, sizeof(char *)
668
607
* ((unsigned int) custom_argc + 1));
669
608
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
672
611
free(org_line);
673
612
goto fallback;
674
613
}
675
614
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
615
custom_argv[custom_argc] = NULL;
677
616
}
678
617
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
618
free(org_line);
688
619
} else {
689
620
/* Check for harmful errors and go to fallback. Other errors might
690
621
not affect opening plugins */
691
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
694
625
goto fallback;
695
626
}
696
627
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
699
630
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
714
636
goto fallback;
715
637
}
716
638
}
717
639
718
640
/* Parse actual command line arguments, to let them override the
719
641
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
734
646
goto fallback;
735
647
}
736
648
748
660
}
749
661
}
750
662
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
663
/* Strip permissions down to nobody */
774
664
setgid(gid);
775
665
if(ret == -1){
776
error(0, errno, "setgid");
666
perror("setgid");
777
667
}
778
668
ret = setuid(uid);
779
669
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
670
perror("setuid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
784
686
{
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
826
695
}
827
696
}
828
697
830
699
831
700
/* Read and execute any executable in the plugin directory*/
832
701
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
702
dirst = readdir(dir);
836
703
837
704
/* All directory entries have been processed */
838
705
if(dirst == NULL){
839
706
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
842
709
goto fallback;
843
710
}
844
711
break;
874
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
742
size_t suf_len = strlen(*suf);
876
743
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
745
== 0)){
879
746
if(debug){
880
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
892
759
893
760
char *filename;
894
761
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
897
763
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
901
765
}
902
766
if(ret < 0){
903
error(0, errno, "asprintf");
767
perror("asprintf");
904
768
continue;
905
769
}
906
770
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
771
ret = stat(filename, &st);
908
772
if(ret == -1){
909
error(0, errno, "stat");
773
perror("stat");
910
774
free(filename);
911
775
continue;
912
776
}
913
777
914
778
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
917
780
if(debug){
918
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
782
" with bad type or mode\n", filename);
924
787
925
788
plugin *p = getplugin(dirst->d_name);
926
789
if(p == NULL){
927
error(0, errno, "getplugin");
790
perror("getplugin");
928
791
free(filename);
929
792
continue;
930
793
}
942
805
if(g != NULL){
943
806
for(char **a = g->argv + 1; *a != NULL; a++){
944
807
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
808
perror("add_argument");
946
809
}
947
810
}
948
811
/* Add global environment variables */
949
812
for(char **e = g->environ; *e != NULL; e++){
950
813
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
814
perror("add_environment");
952
815
}
953
816
}
954
817
}
959
822
if(p->environ[0] != NULL){
960
823
for(char **e = environ; *e != NULL; e++){
961
824
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
825
perror("add_environment");
963
826
}
964
827
}
965
828
}
966
829
967
830
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
831
ret = pipe(pipefd);
969
832
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
972
835
goto fallback;
973
836
}
974
837
/* Ask OS to automatic close the pipe on exec */
975
838
ret = set_cloexec_flag(pipefd[0]);
976
839
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
979
842
goto fallback;
980
843
}
981
844
ret = set_cloexec_flag(pipefd[1]);
982
845
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
985
848
goto fallback;
986
849
}
987
850
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
852
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
994
855
goto fallback;
995
856
}
996
857
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
858
pid_t pid = fork();
1001
859
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
1004
862
goto fallback;
1005
863
}
1006
864
if(pid == 0){
1007
865
/* this is the child process */
1008
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
867
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1012
870
}
1013
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
872
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1017
875
}
1018
876
1019
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
878
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1023
881
}
1024
882
1025
883
if(dirfd(dir) < 0){
1029
887
}
1030
888
if(p->environ[0] == NULL){
1031
889
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
890
perror("execv");
891
_exit(EXIT_FAILURE);
1034
892
}
1035
893
} else {
1036
894
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
895
perror("execve");
896
_exit(EXIT_FAILURE);
1039
897
}
1040
898
}
1041
899
/* no return */
1042
900
}
1043
901
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
902
close(pipefd[1]); /* Close unused write end of pipe */
1046
903
free(filename);
1047
904
plugin *new_plugin = getplugin(dirst->d_name);
1048
905
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
908
if(ret < 0){
1054
error(0, errno, "sigprocmask");
909
perror("sigprocmask");
1055
910
}
1056
exitstatus = EX_OSERR;
911
exitstatus = EXIT_FAILURE;
1057
912
goto fallback;
1058
913
}
1059
914
1062
917
1063
918
/* Unblock SIGCHLD so signal handler can be run if this process
1064
919
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
921
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1071
924
goto fallback;
1072
925
}
1073
926
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
927
FD_SET(new_plugin->fd, &rfds_all);
1076
928
1077
929
if(maxfd < new_plugin->fd){
1078
930
maxfd = new_plugin->fd;
1079
931
}
1080
932
}
1081
933
1082
TEMP_FAILURE_RETRY(closedir(dir));
934
closedir(dir);
1083
935
dir = NULL;
1084
936
free_plugin(getplugin(NULL));
1085
937
1098
950
while(plugin_list){
1099
951
fd_set rfds = rfds_all;
1100
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1104
956
goto fallback;
1105
957
}
1106
958
/* OK, now either a process completed, or something can be read
1121
973
WEXITSTATUS(proc->status));
1122
974
} else if(WIFSIGNALED(proc->status)){
1123
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
976
" signal %d\n", proc->name,
1125
977
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(proc->status)));
978
WTERMSIG(proc->status));
1128
979
} else if(WCOREDUMP(proc->status)){
1129
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
981
" core\n", proc->name, (intmax_t) (proc->pid));
1132
983
}
1133
984
1134
985
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
986
FD_CLR(proc->fd, &rfds_all);
1137
987
1138
988
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1143
990
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
1146
993
goto fallback;
1147
994
}
1148
995
1151
998
proc = next_plugin;
1152
999
1153
1000
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1157
1003
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1004
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1160
1006
goto fallback;
1161
1007
}
1162
1008
1172
1018
bool bret = print_out_password(proc->buffer,
1173
1019
proc->buffer_length);
1174
1020
if(not bret){
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
1177
1023
}
1178
1024
goto fallback;
1179
1025
}
1180
1026
1181
1027
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
1029
/* This process had nothing to say at this time */
1186
1030
proc = proc->next;
1187
1031
continue;
1191
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
1036
+ (size_t) BUFFER_SIZE);
1193
1037
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1038
perror("malloc");
1039
exitstatus = EXIT_FAILURE;
1196
1040
goto fallback;
1197
1041
}
1198
1042
proc->buffer_size += BUFFER_SIZE;
1199
1043
}
1200
1044
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1205
1047
if(sret < 0){
1206
1048
/* Read error from this process; ignore the error */
1207
1049
proc = proc->next;
1219
1061
1220
1062
fallback:
1221
1063
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1224
1065
/* Fallback if all plugins failed, none are found or an error
1225
1066
occured */
1226
1067
bool bret;
1234
1075
}
1235
1076
bret = print_out_password(passwordbuffer, len);
1236
1077
if(not bret){
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1239
1080
}
1240
1081
}
1241
1082
1242
1083
/* Restore old signal handler */
1243
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
1085
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1247
1088
}
1248
1089
1249
1090
if(custom_argv != NULL){
1264
1105
ret = kill(p->pid, SIGTERM);
1265
1106
if(ret == -1 and errno != ESRCH){
1266
1107
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1108
perror("kill");
1268
1109
}
1269
1110
}
1270
1111
}
1271
1112
1272
1113
/* Wait for any remaining child processes to terminate */
1273
do {
1114
do{
1274
1115
ret = wait(NULL);
1275
1116
} while(ret >= 0);
1276
1117
if(errno != ECHILD){
1277
error(0, errno, "wait");
1118
perror("wait");
1278
1119
}
1279
1120
1280
1121
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0