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- Committer: Teddy Hogeborn
- Date: 2014-03-01 10:59:22 UTC
- Revision ID: teddy@recompile.se-20140301105922-xq8gjlvr22187si3
* debian/control (Standards-Version): Updated to "3.9.5".
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- 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 © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 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(),
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() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
66
68
*/
67
69
#include <errno.h> /* errno, EBADF */
68
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() */
69
75
70
76
#define BUFFER_SIZE 256
71
77
73
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
80
75
81
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
77
83
78
84
typedef struct plugin{
79
85
char *name; /* can be NULL or any plugin name */
100
106
/* Gets an existing plugin based on name,
101
107
or if none is found, creates a new one */
102
108
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
104
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
111
if((p->name == name)
106
112
or (p->name and name and (strcmp(p->name, name) == 0))){
108
114
}
109
115
}
110
116
/* Create a new plugin */
111
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);
112
121
if(new_plugin == NULL){
113
122
return NULL;
114
123
}
115
124
char *copy_name = NULL;
116
125
if(name != NULL){
117
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
118
129
if(copy_name == NULL){
130
int e = errno;
119
131
free(new_plugin);
132
errno = e;
120
133
return NULL;
121
134
}
122
135
}
126
139
.disabled = false,
127
140
.next = plugin_list };
128
141
129
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);
130
145
if(new_plugin->argv == NULL){
146
int e = errno;
131
147
free(copy_name);
132
148
free(new_plugin);
149
errno = e;
133
150
return NULL;
134
151
}
135
152
new_plugin->argv[0] = copy_name;
136
153
new_plugin->argv[1] = NULL;
137
154
138
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
139
158
if(new_plugin->environ == NULL){
159
int e = errno;
140
160
free(copy_name);
141
161
free(new_plugin->argv);
142
162
free(new_plugin);
163
errno = e;
143
164
return NULL;
144
165
}
145
166
new_plugin->environ[0] = NULL;
150
171
}
151
172
152
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
153
175
static bool add_to_char_array(const char *new, char ***array,
154
176
int *len){
155
177
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
158
182
/* Malloc check */
159
183
if(*array == NULL){
160
184
return false;
161
185
}
162
186
/* Make a copy of the new string */
163
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
164
191
if(copy == NULL){
165
192
return false;
166
193
}
173
200
}
174
201
175
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
176
204
static bool add_argument(plugin *p, const char *arg){
177
205
if(p == NULL){
178
206
return false;
181
209
}
182
210
183
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
184
213
static bool add_environment(plugin *p, const char *def, bool replace){
185
214
if(p == NULL){
186
215
return false;
192
221
if(strncmp(*e, def, namelen + 1) == 0){
193
222
/* It already exists */
194
223
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
196
228
if(new == NULL){
197
229
return false;
198
230
}
208
240
/*
209
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
242
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
244
*/
213
245
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
247
/* If reading the flags failed, return error indication now. */
216
248
if(ret < 0){
217
249
return ret;
218
250
}
219
251
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
221
254
}
222
255
223
256
238
271
/* No child processes */
239
272
break;
240
273
}
241
perror("waitpid");
274
error(0, errno, "waitpid");
242
275
}
243
276
244
277
/* A child exited, find it in process_list */
256
289
}
257
290
258
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
259
293
static bool print_out_password(const char *buffer, size_t length){
260
294
ssize_t ret;
261
295
for(size_t written = 0; written < length; written += (size_t)ret){
269
303
}
270
304
271
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
272
307
static void free_plugin(plugin *plugin_node){
273
308
274
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
315
350
fd_set rfds_all;
316
351
int ret, maxfd = 0;
317
352
ssize_t sret;
318
intmax_t tmpmax;
319
353
uid_t uid = 65534;
320
354
gid_t gid = 65534;
321
355
bool debug = false;
330
364
sigemptyset(&sigchld_action.sa_mask);
331
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
366
if(ret == -1){
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
335
369
goto fallback;
336
370
}
337
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
372
if(ret == -1){
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
341
375
goto fallback;
342
376
}
343
377
375
409
.doc = "Group ID the plugins will run as", .group = 3 },
376
410
{ .name = "debug", .key = 132,
377
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
378
421
{ .name = NULL }
379
422
};
380
423
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
384
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
385
430
case 'g': /* --global-options */
386
if(arg != NULL){
431
{
387
432
char *plugin_option;
388
433
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
390
continue;
391
}
392
434
if(not add_argument(getplugin(NULL), plugin_option)){
393
perror("add_argument");
394
return ARGP_ERR_UNKNOWN;
435
break;
395
436
}
396
437
}
397
438
}
398
439
break;
399
440
case 'G': /* --global-env */
400
if(arg == NULL){
401
break;
402
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
405
}
441
add_environment(getplugin(NULL), arg, true);
406
442
break;
407
443
case 'o': /* --options-for */
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;
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;
418
462
}
419
463
}
420
464
}
421
465
break;
422
466
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
467
{
427
468
char *envdef = strchr(arg, ':');
428
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
429
472
break;
430
473
}
431
474
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
434
480
}
481
add_environment(getplugin(arg), envdef, true);
435
482
}
436
483
break;
437
484
case 'd': /* --disable */
438
if(arg != NULL){
485
{
439
486
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
442
489
}
443
p->disabled = true;
444
490
}
445
491
break;
446
492
case 'e': /* --enable */
447
if(arg != NULL){
493
{
448
494
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
451
497
}
452
p->disabled = false;
453
498
}
454
499
break;
455
500
case 128: /* --plugin-dir */
456
501
free(plugindir);
457
502
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
503
break;
462
504
case 129: /* --config-file */
463
505
/* This is already done by parse_opt_config_file() */
464
506
break;
465
507
case 130: /* --userid */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
508
tmp_id = strtoimax(arg, &tmp, 10);
468
509
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
474
514
}
515
uid = (uid_t)tmp_id;
475
516
break;
476
517
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
518
tmp_id = strtoimax(arg, &tmp, 10);
479
519
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
485
524
}
525
gid = (gid_t)tmp_id;
486
526
break;
487
527
case 132: /* --debug */
488
528
debug = true;
489
529
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
490
544
/*
491
545
* When adding more options before this line, remember to also add a
492
546
* "case" to the "parse_opt_config_file" function below.
495
549
/* Cryptsetup always passes an argument, which is an empty
496
550
string if "none" was specified in /etc/crypttab. So if
497
551
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
500
554
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
555
default:
505
556
return ARGP_ERR_UNKNOWN;
506
557
}
507
return 0;
558
return errno; /* Set to 0 at start */
508
559
}
509
560
510
561
/* This option parser is the same as parse_opt() above, except it
512
563
error_t parse_opt_config_file(int key, char *arg,
513
564
__attribute__((unused))
514
565
struct argp_state *state){
566
errno = 0;
515
567
switch(key){
516
568
case 'g': /* --global-options */
517
569
case 'G': /* --global-env */
524
576
case 129: /* --config-file */
525
577
free(argfile);
526
578
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
579
break;
531
580
case 130: /* --userid */
532
581
case 131: /* --groupid */
533
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
534
586
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
587
break;
537
588
default:
538
589
return ARGP_ERR_UNKNOWN;
539
590
}
540
return 0;
591
return errno;
541
592
}
542
593
543
594
struct argp argp = { .options = options,
547
598
548
599
/* Parse using parse_opt_config_file() in order to get the custom
549
600
config file location, if any. */
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;
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;
554
615
goto fallback;
555
616
}
556
617
562
623
conffp = fopen(AFILE, "r");
563
624
} else {
564
625
conffp = fopen(argfile, "r");
565
}
626
}
566
627
if(conffp != NULL){
567
628
char *org_line = NULL;
568
629
char *p, *arg, *new_arg, *line;
573
634
custom_argc = 1;
574
635
custom_argv = malloc(sizeof(char*) * 2);
575
636
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
578
639
goto fallback;
579
640
}
580
641
custom_argv[0] = argv[0];
596
657
}
597
658
new_arg = strdup(p);
598
659
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
601
662
free(org_line);
602
663
goto fallback;
603
664
}
606
667
custom_argv = realloc(custom_argv, sizeof(char *)
607
668
* ((unsigned int) custom_argc + 1));
608
669
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
611
672
free(org_line);
612
673
goto fallback;
613
674
}
614
675
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
616
677
}
617
678
}
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
}
618
687
free(org_line);
619
688
} else {
620
689
/* Check for harmful errors and go to fallback. Other errors might
621
690
not affect opening plugins */
622
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
625
694
goto fallback;
626
695
}
627
696
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
630
699
if(custom_argv != NULL){
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;
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;
636
714
goto fallback;
637
715
}
638
716
}
639
717
640
718
/* Parse actual command line arguments, to let them override the
641
719
config file */
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;
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;
646
734
goto fallback;
647
735
}
648
736
660
748
}
661
749
}
662
750
663
/* Strip permissions down to nobody */
664
setgid(gid);
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 */
774
ret = setgid(gid);
665
775
if(ret == -1){
666
perror("setgid");
776
error(0, errno, "setgid");
667
777
}
668
778
ret = setuid(uid);
669
779
if(ret == -1){
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 */
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
686
784
{
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
}
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;
695
826
}
696
827
}
697
828
699
830
700
831
/* Read and execute any executable in the plugin directory*/
701
832
while(true){
702
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
703
836
704
837
/* All directory entries have been processed */
705
838
if(dirst == NULL){
706
839
if(errno == EBADF){
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
709
842
goto fallback;
710
843
}
711
844
break;
717
850
{
718
851
bool bad_name = false;
719
852
720
const char const *bad_prefixes[] = { ".", "#", NULL };
853
const char * const bad_prefixes[] = { ".", "#", NULL };
721
854
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
855
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
723
856
".dpkg-old",
724
857
".dpkg-bak",
725
858
".dpkg-divert", NULL };
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
859
#pragma GCC diagnostic push
860
#pragma GCC diagnostic ignored "-Wcast-qual"
861
for(const char **pre = (const char **)bad_prefixes;
862
*pre != NULL; pre++){
863
#pragma GCC diagnostic pop
727
864
size_t pre_len = strlen(*pre);
728
865
if((d_name_len >= pre_len)
729
866
and strncmp((dirst->d_name), *pre, pre_len) == 0){
738
875
if(bad_name){
739
876
continue;
740
877
}
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
for(const char **suf = (const char **)bad_suffixes;
881
*suf != NULL; suf++){
882
#pragma GCC diagnostic pop
742
883
size_t suf_len = strlen(*suf);
743
884
if((d_name_len >= suf_len)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
885
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
745
886
== 0)){
746
887
if(debug){
747
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
759
900
760
901
char *filename;
761
902
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
903
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
904
dirst->d_name));
763
905
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
906
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
907
plugindir,
908
dirst->d_name));
765
909
}
766
910
if(ret < 0){
767
perror("asprintf");
911
error(0, errno, "asprintf");
768
912
continue;
769
913
}
770
914
771
ret = stat(filename, &st);
915
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
916
if(ret == -1){
773
perror("stat");
917
error(0, errno, "stat");
774
918
free(filename);
775
919
continue;
776
920
}
777
921
778
922
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
780
925
if(debug){
781
926
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
927
" with bad type or mode\n", filename);
787
932
788
933
plugin *p = getplugin(dirst->d_name);
789
934
if(p == NULL){
790
perror("getplugin");
935
error(0, errno, "getplugin");
791
936
free(filename);
792
937
continue;
793
938
}
805
950
if(g != NULL){
806
951
for(char **a = g->argv + 1; *a != NULL; a++){
807
952
if(not add_argument(p, *a)){
808
perror("add_argument");
953
error(0, errno, "add_argument");
809
954
}
810
955
}
811
956
/* Add global environment variables */
812
957
for(char **e = g->environ; *e != NULL; e++){
813
958
if(not add_environment(p, *e, false)){
814
perror("add_environment");
959
error(0, errno, "add_environment");
815
960
}
816
961
}
817
962
}
822
967
if(p->environ[0] != NULL){
823
968
for(char **e = environ; *e != NULL; e++){
824
969
if(not add_environment(p, *e, false)){
825
perror("add_environment");
970
error(0, errno, "add_environment");
826
971
}
827
972
}
828
973
}
829
974
830
975
int pipefd[2];
831
ret = pipe(pipefd);
976
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
832
977
if(ret == -1){
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
978
error(0, errno, "pipe");
979
exitstatus = EX_OSERR;
835
980
goto fallback;
836
981
}
837
982
/* Ask OS to automatic close the pipe on exec */
838
983
ret = set_cloexec_flag(pipefd[0]);
839
984
if(ret < 0){
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
985
error(0, errno, "set_cloexec_flag");
986
exitstatus = EX_OSERR;
842
987
goto fallback;
843
988
}
844
989
ret = set_cloexec_flag(pipefd[1]);
845
990
if(ret < 0){
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
991
error(0, errno, "set_cloexec_flag");
992
exitstatus = EX_OSERR;
848
993
goto fallback;
849
994
}
850
995
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
996
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
997
&sigchld_action.sa_mask,
998
NULL));
852
999
if(ret < 0){
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
1000
error(0, errno, "sigprocmask");
1001
exitstatus = EX_OSERR;
855
1002
goto fallback;
856
1003
}
857
1004
/* Starting a new process to be watched */
858
pid_t pid = fork();
1005
pid_t pid;
1006
do {
1007
pid = fork();
1008
} while(pid == -1 and errno == EINTR);
859
1009
if(pid == -1){
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
1010
error(0, errno, "fork");
1011
exitstatus = EX_OSERR;
862
1012
goto fallback;
863
1013
}
864
1014
if(pid == 0){
865
1015
/* this is the child process */
866
1016
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
867
1017
if(ret < 0){
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1018
error(0, errno, "sigaction");
1019
_exit(EX_OSERR);
870
1020
}
871
1021
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
1022
if(ret < 0){
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1023
error(0, errno, "sigprocmask");
1024
_exit(EX_OSERR);
875
1025
}
876
1026
877
1027
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
1028
if(ret == -1){
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1029
error(0, errno, "dup2");
1030
_exit(EX_OSERR);
881
1031
}
882
1032
883
1033
if(dirfd(dir) < 0){
887
1037
}
888
1038
if(p->environ[0] == NULL){
889
1039
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
1040
error(0, errno, "execv for %s", filename);
1041
_exit(EX_OSERR);
892
1042
}
893
1043
} else {
894
1044
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
1045
error(0, errno, "execve for %s", filename);
1046
_exit(EX_OSERR);
897
1047
}
898
1048
}
899
1049
/* no return */
900
1050
}
901
1051
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
1052
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1053
pipe */
903
1054
free(filename);
904
1055
plugin *new_plugin = getplugin(dirst->d_name);
905
1056
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1057
error(0, errno, "getplugin");
1058
ret = (int)(TEMP_FAILURE_RETRY
1059
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1060
NULL)));
908
1061
if(ret < 0){
909
perror("sigprocmask");
1062
error(0, errno, "sigprocmask");
910
1063
}
911
exitstatus = EXIT_FAILURE;
1064
exitstatus = EX_OSERR;
912
1065
goto fallback;
913
1066
}
914
1067
917
1070
918
1071
/* Unblock SIGCHLD so signal handler can be run if this process
919
1072
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1073
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1074
&sigchld_action.sa_mask,
1075
NULL));
921
1076
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1077
error(0, errno, "sigprocmask");
1078
exitstatus = EX_OSERR;
924
1079
goto fallback;
925
1080
}
926
1081
927
FD_SET(new_plugin->fd, &rfds_all);
1082
#if defined (__GNUC__) and defined (__GLIBC__)
1083
#if not __GLIBC_PREREQ(2, 16)
1084
#pragma GCC diagnostic push
1085
#pragma GCC diagnostic ignored "-Wsign-conversion"
1086
#endif
1087
#endif
1088
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1089
-Wconversion in GNU libc
1090
before 2.16 */
1091
#if defined (__GNUC__) and defined (__GLIBC__)
1092
#if not __GLIBC_PREREQ(2, 16)
1093
#pragma GCC diagnostic pop
1094
#endif
1095
#endif
928
1096
929
1097
if(maxfd < new_plugin->fd){
930
1098
maxfd = new_plugin->fd;
931
1099
}
932
1100
}
933
1101
934
closedir(dir);
1102
TEMP_FAILURE_RETRY(closedir(dir));
935
1103
dir = NULL;
936
1104
free_plugin(getplugin(NULL));
937
1105
950
1118
while(plugin_list){
951
1119
fd_set rfds = rfds_all;
952
1120
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1121
if(select_ret == -1 and errno != EINTR){
1122
error(0, errno, "select");
1123
exitstatus = EX_OSERR;
956
1124
goto fallback;
957
1125
}
958
1126
/* OK, now either a process completed, or something can be read
973
1141
WEXITSTATUS(proc->status));
974
1142
} else if(WIFSIGNALED(proc->status)){
975
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
1144
" signal %d: %s\n", proc->name,
977
1145
(intmax_t) (proc->pid),
978
WTERMSIG(proc->status));
1146
WTERMSIG(proc->status),
1147
strsignal(WTERMSIG(proc->status)));
979
1148
} else if(WCOREDUMP(proc->status)){
980
1149
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
1150
" core\n", proc->name, (intmax_t) (proc->pid));
983
1152
}
984
1153
985
1154
/* Remove the plugin */
986
FD_CLR(proc->fd, &rfds_all);
1155
#if defined (__GNUC__) and defined (__GLIBC__)
1156
#if not __GLIBC_PREREQ(2, 16)
1157
#pragma GCC diagnostic push
1158
#pragma GCC diagnostic ignored "-Wsign-conversion"
1159
#endif
1160
#endif
1161
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1162
-Wconversion in GNU libc
1163
before 2.16 */
1164
#if defined (__GNUC__) and defined (__GLIBC__)
1165
#if not __GLIBC_PREREQ(2, 16)
1166
#pragma GCC diagnostic pop
1167
#endif
1168
#endif
987
1169
988
1170
/* Block signal while modifying process_list */
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1171
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1172
(SIG_BLOCK,
1173
&sigchld_action.sa_mask,
1174
NULL));
990
1175
if(ret < 0){
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
1176
error(0, errno, "sigprocmask");
1177
exitstatus = EX_OSERR;
993
1178
goto fallback;
994
1179
}
995
1180
998
1183
proc = next_plugin;
999
1184
1000
1185
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1186
ret = (int)(TEMP_FAILURE_RETRY
1187
(sigprocmask(SIG_UNBLOCK,
1188
&sigchld_action.sa_mask, NULL)));
1003
1189
if(ret < 0){
1004
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1190
error(0, errno, "sigprocmask");
1191
exitstatus = EX_OSERR;
1006
1192
goto fallback;
1007
1193
}
1008
1194
1018
1204
bool bret = print_out_password(proc->buffer,
1019
1205
proc->buffer_length);
1020
1206
if(not bret){
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
1207
error(0, errno, "print_out_password");
1208
exitstatus = EX_IOERR;
1023
1209
}
1024
1210
goto fallback;
1025
1211
}
1026
1212
1027
1213
/* This process has not completed. Does it have any output? */
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1214
#if defined (__GNUC__) and defined (__GLIBC__)
1215
#if not __GLIBC_PREREQ(2, 16)
1216
#pragma GCC diagnostic push
1217
#pragma GCC diagnostic ignored "-Wsign-conversion"
1218
#endif
1219
#endif
1220
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1221
warning from
1222
-Wconversion
1223
in GNU libc
1224
before
1225
2.16 */
1226
#if defined (__GNUC__) and defined (__GLIBC__)
1227
#if not __GLIBC_PREREQ(2, 16)
1228
#pragma GCC diagnostic pop
1229
#endif
1230
#endif
1029
1231
/* This process had nothing to say at this time */
1030
1232
proc = proc->next;
1031
1233
continue;
1035
1237
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
1238
+ (size_t) BUFFER_SIZE);
1037
1239
if(proc->buffer == NULL){
1038
perror("malloc");
1039
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "malloc");
1241
exitstatus = EX_OSERR;
1040
1242
goto fallback;
1041
1243
}
1042
1244
proc->buffer_size += BUFFER_SIZE;
1043
1245
}
1044
1246
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1247
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1248
proc->buffer
1249
+ proc->buffer_length,
1250
BUFFER_SIZE));
1047
1251
if(sret < 0){
1048
1252
/* Read error from this process; ignore the error */
1049
1253
proc = proc->next;
1061
1265
1062
1266
fallback:
1063
1267
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1268
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1269
and exitstatus != EX_OK)){
1065
1270
/* Fallback if all plugins failed, none are found or an error
1066
1271
occured */
1067
1272
bool bret;
1075
1280
}
1076
1281
bret = print_out_password(passwordbuffer, len);
1077
1282
if(not bret){
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1283
error(0, errno, "print_out_password");
1284
exitstatus = EX_IOERR;
1080
1285
}
1081
1286
}
1082
1287
1083
1288
/* Restore old signal handler */
1084
1289
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1085
1290
if(ret == -1){
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1291
error(0, errno, "sigaction");
1292
exitstatus = EX_OSERR;
1088
1293
}
1089
1294
1090
1295
if(custom_argv != NULL){
1105
1310
ret = kill(p->pid, SIGTERM);
1106
1311
if(ret == -1 and errno != ESRCH){
1107
1312
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1313
error(0, errno, "kill");
1109
1314
}
1110
1315
}
1111
1316
}
1112
1317
1113
1318
/* Wait for any remaining child processes to terminate */
1114
do{
1319
do {
1115
1320
ret = wait(NULL);
1116
1321
} while(ret >= 0);
1117
1322
if(errno != ECHILD){
1118
perror("wait");
1323
error(0, errno, "wait");
1119
1324
}
1120
1325
1121
1326
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0