To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 256
- compare with another revision
- download diff
- download tarball
- view history from revision 256
- Committer: Teddy Hogeborn
- Date: 2009-05-17 00:50:09 UTC
- Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
- 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 © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
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
char **new_array = NULL;
179
do {
180
new_array = realloc(*array, sizeof(char *)
181
* (size_t) ((*len) + 2));
182
} while(new_array == NULL and errno == EINTR);
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
183
158
/* Malloc check */
184
if(new_array == NULL){
159
if(*array == NULL){
185
160
return false;
186
161
}
187
*array = new_array;
188
162
/* Make a copy of the new string */
189
char *copy;
190
do {
191
copy = strdup(new);
192
} while(copy == NULL and errno == EINTR);
163
char *copy = strdup(new);
193
164
if(copy == NULL){
194
165
return false;
195
166
}
202
173
}
203
174
204
175
/* Add to a plugin's argument vector */
205
__attribute__((nonnull(2)))
206
176
static bool add_argument(plugin *p, const char *arg){
207
177
if(p == NULL){
208
178
return false;
211
181
}
212
182
213
183
/* Add to a plugin's environment */
214
__attribute__((nonnull(2)))
215
184
static bool add_environment(plugin *p, const char *def, bool replace){
216
185
if(p == NULL){
217
186
return false;
219
188
/* namelen = length of name of environment variable */
220
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
221
190
/* Search for this environment variable */
222
for(char **envdef = p->environ; *envdef != NULL; envdef++){
223
if(strncmp(*envdef, def, namelen + 1) == 0){
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
224
193
/* It already exists */
225
194
if(replace){
226
char *new_envdef;
227
do {
228
new_envdef = realloc(*envdef, strlen(def) + 1);
229
} while(new_envdef == NULL and errno == EINTR);
230
if(new_envdef == NULL){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
231
197
return false;
232
198
}
233
*envdef = new_envdef;
234
strcpy(*envdef, def);
199
*e = new;
200
strcpy(*e, def);
235
201
}
236
202
return true;
237
203
}
242
208
/*
243
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
244
210
* Descriptor Flags".
245
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
246
212
*/
247
213
static int set_cloexec_flag(int fd){
248
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
int ret = fcntl(fd, F_GETFD, 0);
249
215
/* If reading the flags failed, return error indication now. */
250
216
if(ret < 0){
251
217
return ret;
252
218
}
253
219
/* Store modified flag word in the descriptor. */
254
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
255
ret | FD_CLOEXEC));
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
256
221
}
257
222
258
223
273
238
/* No child processes */
274
239
break;
275
240
}
276
error(0, errno, "waitpid");
241
perror("waitpid");
277
242
}
278
243
279
244
/* A child exited, find it in process_list */
291
256
}
292
257
293
258
/* Prints out a password to stdout */
294
__attribute__((nonnull))
295
259
static bool print_out_password(const char *buffer, size_t length){
296
260
ssize_t ret;
297
261
for(size_t written = 0; written < length; written += (size_t)ret){
305
269
}
306
270
307
271
/* Removes and free a plugin from the plugin list */
308
__attribute__((nonnull))
309
272
static void free_plugin(plugin *plugin_node){
310
273
311
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
352
315
fd_set rfds_all;
353
316
int ret, maxfd = 0;
354
317
ssize_t sret;
318
intmax_t tmpmax;
355
319
uid_t uid = 65534;
356
320
gid_t gid = 65534;
357
321
bool debug = false;
366
330
sigemptyset(&sigchld_action.sa_mask);
367
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
368
332
if(ret == -1){
369
error(0, errno, "sigaddset");
370
exitstatus = EX_OSERR;
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
371
335
goto fallback;
372
336
}
373
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
374
338
if(ret == -1){
375
error(0, errno, "sigaction");
376
exitstatus = EX_OSERR;
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
377
341
goto fallback;
378
342
}
379
343
411
375
.doc = "Group ID the plugins will run as", .group = 3 },
412
376
{ .name = "debug", .key = 132,
413
377
.doc = "Debug mode", .group = 4 },
414
/*
415
* These reproduce what we would get without ARGP_NO_HELP
416
*/
417
{ .name = "help", .key = '?',
418
.doc = "Give this help list", .group = -1 },
419
{ .name = "usage", .key = -3,
420
.doc = "Give a short usage message", .group = -1 },
421
{ .name = "version", .key = 'V',
422
.doc = "Print program version", .group = -1 },
423
378
{ .name = NULL }
424
379
};
425
380
426
__attribute__((nonnull(3)))
427
error_t parse_opt(int key, char *arg, struct argp_state *state){
428
errno = 0;
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
429
384
switch(key){
430
char *tmp;
431
intmax_t tmp_id;
432
385
case 'g': /* --global-options */
433
{
386
if(arg != NULL){
434
387
char *plugin_option;
435
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
390
continue;
391
}
436
392
if(not add_argument(getplugin(NULL), plugin_option)){
437
break;
393
perror("add_argument");
394
return ARGP_ERR_UNKNOWN;
438
395
}
439
396
}
440
397
}
441
398
break;
442
399
case 'G': /* --global-env */
443
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
}
444
406
break;
445
407
case 'o': /* --options-for */
446
{
447
char *option_list = strchr(arg, ':');
448
if(option_list == NULL){
449
argp_error(state, "No colon in \"%s\"", arg);
450
errno = EINVAL;
451
break;
452
}
453
*option_list = '\0';
454
option_list++;
455
if(arg[0] == '\0'){
456
argp_error(state, "Empty plugin name");
457
errno = EINVAL;
458
break;
459
}
460
char *option;
461
while((option = strsep(&option_list, ",")) != NULL){
462
if(not add_argument(getplugin(arg), option)){
463
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;
464
418
}
465
419
}
466
420
}
467
421
break;
468
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
469
426
{
470
427
char *envdef = strchr(arg, ':');
471
428
if(envdef == NULL){
472
argp_error(state, "No colon in \"%s\"", arg);
473
errno = EINVAL;
474
429
break;
475
430
}
476
431
*envdef = '\0';
477
envdef++;
478
if(arg[0] == '\0'){
479
argp_error(state, "Empty plugin name");
480
errno = EINVAL;
481
break;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
482
434
}
483
add_environment(getplugin(arg), envdef, true);
484
435
}
485
436
break;
486
437
case 'd': /* --disable */
487
{
438
if(arg != NULL){
488
439
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = true;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
491
442
}
443
p->disabled = true;
492
444
}
493
445
break;
494
446
case 'e': /* --enable */
495
{
447
if(arg != NULL){
496
448
plugin *p = getplugin(arg);
497
if(p != NULL){
498
p->disabled = false;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
499
451
}
452
p->disabled = false;
500
453
}
501
454
break;
502
455
case 128: /* --plugin-dir */
503
456
free(plugindir);
504
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
505
461
break;
506
462
case 129: /* --config-file */
507
463
/* This is already done by parse_opt_config_file() */
508
464
break;
509
465
case 130: /* --userid */
510
tmp_id = strtoimax(arg, &tmp, 10);
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
511
468
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmp_id != (uid_t)tmp_id){
513
argp_error(state, "Bad user ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)uid);
515
break;
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;
516
474
}
517
uid = (uid_t)tmp_id;
518
475
break;
519
476
case 131: /* --groupid */
520
tmp_id = strtoimax(arg, &tmp, 10);
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
521
479
if(errno != 0 or tmp == arg or *tmp != '\0'
522
or tmp_id != (gid_t)tmp_id){
523
argp_error(state, "Bad group ID number: \"%s\", using %"
524
PRIdMAX, arg, (intmax_t)gid);
525
break;
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;
526
485
}
527
gid = (gid_t)tmp_id;
528
486
break;
529
487
case 132: /* --debug */
530
488
debug = true;
531
489
break;
532
/*
533
* These reproduce what we would get without ARGP_NO_HELP
534
*/
535
case '?': /* --help */
536
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
537
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
538
case -3: /* --usage */
539
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
540
argp_state_help(state, state->out_stream,
541
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
542
case 'V': /* --version */
543
fprintf(state->out_stream, "%s\n", argp_program_version);
544
exit(EXIT_SUCCESS);
545
break;
546
490
/*
547
491
* When adding more options before this line, remember to also add a
548
492
* "case" to the "parse_opt_config_file" function below.
551
495
/* Cryptsetup always passes an argument, which is an empty
552
496
string if "none" was specified in /etc/crypttab. So if
553
497
argument was empty, we ignore it silently. */
554
if(arg[0] == '\0'){
555
break;
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
556
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
557
504
default:
558
505
return ARGP_ERR_UNKNOWN;
559
506
}
560
return errno; /* Set to 0 at start */
507
return 0;
561
508
}
562
509
563
510
/* This option parser is the same as parse_opt() above, except it
565
512
error_t parse_opt_config_file(int key, char *arg,
566
513
__attribute__((unused))
567
514
struct argp_state *state){
568
errno = 0;
569
515
switch(key){
570
516
case 'g': /* --global-options */
571
517
case 'G': /* --global-env */
578
524
case 129: /* --config-file */
579
525
free(argfile);
580
526
argfile = strdup(arg);
581
break;
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
582
531
case 130: /* --userid */
583
532
case 131: /* --groupid */
584
533
case 132: /* --debug */
585
case '?': /* --help */
586
case -3: /* --usage */
587
case 'V': /* --version */
588
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
589
536
break;
590
537
default:
591
538
return ARGP_ERR_UNKNOWN;
592
539
}
593
return errno;
540
return 0;
594
541
}
595
542
596
543
struct argp argp = { .options = options,
600
547
601
548
/* Parse using parse_opt_config_file() in order to get the custom
602
549
config file location, if any. */
603
ret = argp_parse(&argp, argc, argv,
604
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
605
NULL, NULL);
606
switch(ret){
607
case 0:
608
break;
609
case ENOMEM:
610
default:
611
errno = ret;
612
error(0, errno, "argp_parse");
613
exitstatus = EX_OSERR;
614
goto fallback;
615
case EINVAL:
616
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;
617
554
goto fallback;
618
555
}
619
556
625
562
conffp = fopen(AFILE, "r");
626
563
} else {
627
564
conffp = fopen(argfile, "r");
628
}
565
}
629
566
if(conffp != NULL){
630
567
char *org_line = NULL;
631
568
char *p, *arg, *new_arg, *line;
636
573
custom_argc = 1;
637
574
custom_argv = malloc(sizeof(char*) * 2);
638
575
if(custom_argv == NULL){
639
error(0, errno, "malloc");
640
exitstatus = EX_OSERR;
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
641
578
goto fallback;
642
579
}
643
580
custom_argv[0] = argv[0];
659
596
}
660
597
new_arg = strdup(p);
661
598
if(new_arg == NULL){
662
error(0, errno, "strdup");
663
exitstatus = EX_OSERR;
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
664
601
free(org_line);
665
602
goto fallback;
666
603
}
667
604
668
605
custom_argc += 1;
669
{
670
char **new_argv = realloc(custom_argv, sizeof(char *)
671
* ((unsigned int)
672
custom_argc + 1));
673
if(new_argv == NULL){
674
error(0, errno, "realloc");
675
exitstatus = EX_OSERR;
676
free(new_arg);
677
free(org_line);
678
goto fallback;
679
} else {
680
custom_argv = new_argv;
681
}
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
682
613
}
683
614
custom_argv[custom_argc-1] = new_arg;
684
custom_argv[custom_argc] = NULL;
615
custom_argv[custom_argc] = NULL;
685
616
}
686
617
}
687
do {
688
ret = fclose(conffp);
689
} while(ret == EOF and errno == EINTR);
690
if(ret == EOF){
691
error(0, errno, "fclose");
692
exitstatus = EX_IOERR;
693
goto fallback;
694
}
695
618
free(org_line);
696
619
} else {
697
620
/* Check for harmful errors and go to fallback. Other errors might
698
621
not affect opening plugins */
699
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
700
error(0, errno, "fopen");
701
exitstatus = EX_OSERR;
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
702
625
goto fallback;
703
626
}
704
627
}
705
/* If there were any arguments from the configuration file, pass
706
them to parser as command line arguments */
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
707
630
if(custom_argv != NULL){
708
ret = argp_parse(&argp, custom_argc, custom_argv,
709
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
710
NULL, NULL);
711
switch(ret){
712
case 0:
713
break;
714
case ENOMEM:
715
default:
716
errno = ret;
717
error(0, errno, "argp_parse");
718
exitstatus = EX_OSERR;
719
goto fallback;
720
case EINVAL:
721
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;
722
636
goto fallback;
723
637
}
724
638
}
725
639
726
640
/* Parse actual command line arguments, to let them override the
727
641
config file */
728
ret = argp_parse(&argp, argc, argv,
729
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
730
NULL, NULL);
731
switch(ret){
732
case 0:
733
break;
734
case ENOMEM:
735
default:
736
errno = ret;
737
error(0, errno, "argp_parse");
738
exitstatus = EX_OSERR;
739
goto fallback;
740
case EINVAL:
741
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;
742
646
goto fallback;
743
647
}
744
648
756
660
}
757
661
}
758
662
759
if(getuid() == 0){
760
/* Work around Debian bug #633582:
761
<http://bugs.debian.org/633582> */
762
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
763
if(plugindir_fd == -1){
764
error(0, errno, "open");
765
} else {
766
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
767
if(ret == -1){
768
error(0, errno, "fstat");
769
} else {
770
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
771
ret = fchown(plugindir_fd, uid, gid);
772
if(ret == -1){
773
error(0, errno, "fchown");
774
}
775
}
776
}
777
TEMP_FAILURE_RETRY(close(plugindir_fd));
778
}
779
}
780
781
/* Lower permissions */
782
ret = setgid(gid);
663
/* Strip permissions down to nobody */
664
setgid(gid);
783
665
if(ret == -1){
784
error(0, errno, "setgid");
666
perror("setgid");
785
667
}
786
668
ret = setuid(uid);
787
669
if(ret == -1){
788
error(0, errno, "setuid");
789
}
790
791
/* 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 */
792
686
{
793
int dir_fd = -1;
794
if(plugindir == NULL){
795
dir_fd = open(PDIR, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
} else {
803
dir_fd = open(plugindir, O_RDONLY |
804
#ifdef O_CLOEXEC
805
O_CLOEXEC
806
#else /* not O_CLOEXEC */
807
0
808
#endif /* not O_CLOEXEC */
809
);
810
}
811
if(dir_fd == -1){
812
error(0, errno, "Could not open plugin dir");
813
exitstatus = EX_UNAVAILABLE;
814
goto fallback;
815
}
816
817
#ifndef O_CLOEXEC
818
/* Set the FD_CLOEXEC flag on the directory */
819
ret = set_cloexec_flag(dir_fd);
820
if(ret < 0){
821
error(0, errno, "set_cloexec_flag");
822
TEMP_FAILURE_RETRY(close(dir_fd));
823
exitstatus = EX_OSERR;
824
goto fallback;
825
}
826
#endif /* O_CLOEXEC */
827
828
dir = fdopendir(dir_fd);
829
if(dir == NULL){
830
error(0, errno, "Could not open plugin dir");
831
TEMP_FAILURE_RETRY(close(dir_fd));
832
exitstatus = EX_OSERR;
833
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
}
834
695
}
835
696
}
836
697
838
699
839
700
/* Read and execute any executable in the plugin directory*/
840
701
while(true){
841
do {
842
dirst = readdir(dir);
843
} while(dirst == NULL and errno == EINTR);
702
dirst = readdir(dir);
844
703
845
704
/* All directory entries have been processed */
846
705
if(dirst == NULL){
847
706
if(errno == EBADF){
848
error(0, errno, "readdir");
849
exitstatus = EX_IOERR;
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
850
709
goto fallback;
851
710
}
852
711
break;
858
717
{
859
718
bool bad_name = false;
860
719
861
const char * const bad_prefixes[] = { ".", "#", NULL };
720
const char const *bad_prefixes[] = { ".", "#", NULL };
862
721
863
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
864
723
".dpkg-old",
865
724
".dpkg-bak",
866
725
".dpkg-divert", NULL };
867
#ifdef __GNUC__
868
#pragma GCC diagnostic push
869
#pragma GCC diagnostic ignored "-Wcast-qual"
870
#endif
871
for(const char **pre = (const char **)bad_prefixes;
872
*pre != NULL; pre++){
873
#ifdef __GNUC__
874
#pragma GCC diagnostic pop
875
#endif
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
876
727
size_t pre_len = strlen(*pre);
877
728
if((d_name_len >= pre_len)
878
729
and strncmp((dirst->d_name), *pre, pre_len) == 0){
887
738
if(bad_name){
888
739
continue;
889
740
}
890
#ifdef __GNUC__
891
#pragma GCC diagnostic push
892
#pragma GCC diagnostic ignored "-Wcast-qual"
893
#endif
894
for(const char **suf = (const char **)bad_suffixes;
895
*suf != NULL; suf++){
896
#ifdef __GNUC__
897
#pragma GCC diagnostic pop
898
#endif
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
899
742
size_t suf_len = strlen(*suf);
900
743
if((d_name_len >= suf_len)
901
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
902
745
== 0)){
903
746
if(debug){
904
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
759
917
760
char *filename;
918
761
if(plugindir == NULL){
919
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
920
dirst->d_name));
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
921
763
} else {
922
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
923
plugindir,
924
dirst->d_name));
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
925
765
}
926
766
if(ret < 0){
927
error(0, errno, "asprintf");
767
perror("asprintf");
928
768
continue;
929
769
}
930
770
931
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
771
ret = stat(filename, &st);
932
772
if(ret == -1){
933
error(0, errno, "stat");
773
perror("stat");
934
774
free(filename);
935
775
continue;
936
776
}
937
777
938
778
/* Ignore non-executable files */
939
if(not S_ISREG(st.st_mode)
940
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
941
780
if(debug){
942
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
943
782
" with bad type or mode\n", filename);
948
787
949
788
plugin *p = getplugin(dirst->d_name);
950
789
if(p == NULL){
951
error(0, errno, "getplugin");
790
perror("getplugin");
952
791
free(filename);
953
792
continue;
954
793
}
966
805
if(g != NULL){
967
806
for(char **a = g->argv + 1; *a != NULL; a++){
968
807
if(not add_argument(p, *a)){
969
error(0, errno, "add_argument");
808
perror("add_argument");
970
809
}
971
810
}
972
811
/* Add global environment variables */
973
812
for(char **e = g->environ; *e != NULL; e++){
974
813
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
814
perror("add_environment");
976
815
}
977
816
}
978
817
}
983
822
if(p->environ[0] != NULL){
984
823
for(char **e = environ; *e != NULL; e++){
985
824
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
825
perror("add_environment");
987
826
}
988
827
}
989
828
}
990
829
991
830
int pipefd[2];
992
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
831
ret = pipe(pipefd);
993
832
if(ret == -1){
994
error(0, errno, "pipe");
995
exitstatus = EX_OSERR;
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
996
835
goto fallback;
997
836
}
998
837
/* Ask OS to automatic close the pipe on exec */
999
838
ret = set_cloexec_flag(pipefd[0]);
1000
839
if(ret < 0){
1001
error(0, errno, "set_cloexec_flag");
1002
exitstatus = EX_OSERR;
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
1003
842
goto fallback;
1004
843
}
1005
844
ret = set_cloexec_flag(pipefd[1]);
1006
845
if(ret < 0){
1007
error(0, errno, "set_cloexec_flag");
1008
exitstatus = EX_OSERR;
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
1009
848
goto fallback;
1010
849
}
1011
850
/* Block SIGCHLD until process is safely in process list */
1012
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1013
&sigchld_action.sa_mask,
1014
NULL));
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1015
852
if(ret < 0){
1016
error(0, errno, "sigprocmask");
1017
exitstatus = EX_OSERR;
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
1018
855
goto fallback;
1019
856
}
1020
857
/* Starting a new process to be watched */
1021
pid_t pid;
1022
do {
1023
pid = fork();
1024
} while(pid == -1 and errno == EINTR);
858
pid_t pid = fork();
1025
859
if(pid == -1){
1026
error(0, errno, "fork");
1027
exitstatus = EX_OSERR;
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
1028
862
goto fallback;
1029
863
}
1030
864
if(pid == 0){
1031
865
/* this is the child process */
1032
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1033
867
if(ret < 0){
1034
error(0, errno, "sigaction");
1035
_exit(EX_OSERR);
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1036
870
}
1037
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
872
if(ret < 0){
1039
error(0, errno, "sigprocmask");
1040
_exit(EX_OSERR);
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1041
875
}
1042
876
1043
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1044
878
if(ret == -1){
1045
error(0, errno, "dup2");
1046
_exit(EX_OSERR);
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1047
881
}
1048
882
1049
883
if(dirfd(dir) < 0){
1053
887
}
1054
888
if(p->environ[0] == NULL){
1055
889
if(execv(filename, p->argv) < 0){
1056
error(0, errno, "execv for %s", filename);
1057
_exit(EX_OSERR);
890
perror("execv");
891
_exit(EXIT_FAILURE);
1058
892
}
1059
893
} else {
1060
894
if(execve(filename, p->argv, p->environ) < 0){
1061
error(0, errno, "execve for %s", filename);
1062
_exit(EX_OSERR);
895
perror("execve");
896
_exit(EXIT_FAILURE);
1063
897
}
1064
898
}
1065
899
/* no return */
1066
900
}
1067
901
/* Parent process */
1068
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1069
pipe */
902
close(pipefd[1]); /* Close unused write end of pipe */
1070
903
free(filename);
1071
904
plugin *new_plugin = getplugin(dirst->d_name);
1072
905
if(new_plugin == NULL){
1073
error(0, errno, "getplugin");
1074
ret = (int)(TEMP_FAILURE_RETRY
1075
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1076
NULL)));
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1077
908
if(ret < 0){
1078
error(0, errno, "sigprocmask");
909
perror("sigprocmask");
1079
910
}
1080
exitstatus = EX_OSERR;
911
exitstatus = EXIT_FAILURE;
1081
912
goto fallback;
1082
913
}
1083
914
1086
917
1087
918
/* Unblock SIGCHLD so signal handler can be run if this process
1088
919
has already completed */
1089
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1090
&sigchld_action.sa_mask,
1091
NULL));
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1092
921
if(ret < 0){
1093
error(0, errno, "sigprocmask");
1094
exitstatus = EX_OSERR;
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1095
924
goto fallback;
1096
925
}
1097
926
1098
#if defined (__GNUC__) and defined (__GLIBC__)
1099
#if not __GLIBC_PREREQ(2, 16)
1100
#pragma GCC diagnostic push
1101
#pragma GCC diagnostic ignored "-Wsign-conversion"
1102
#endif
1103
#endif
1104
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion in GNU libc
1106
before 2.16 */
1107
#if defined (__GNUC__) and defined (__GLIBC__)
1108
#if not __GLIBC_PREREQ(2, 16)
1109
#pragma GCC diagnostic pop
1110
#endif
1111
#endif
927
FD_SET(new_plugin->fd, &rfds_all);
1112
928
1113
929
if(maxfd < new_plugin->fd){
1114
930
maxfd = new_plugin->fd;
1115
931
}
1116
932
}
1117
933
1118
TEMP_FAILURE_RETRY(closedir(dir));
934
closedir(dir);
1119
935
dir = NULL;
1120
936
free_plugin(getplugin(NULL));
1121
937
1134
950
while(plugin_list){
1135
951
fd_set rfds = rfds_all;
1136
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1137
if(select_ret == -1 and errno != EINTR){
1138
error(0, errno, "select");
1139
exitstatus = EX_OSERR;
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1140
956
goto fallback;
1141
957
}
1142
958
/* OK, now either a process completed, or something can be read
1157
973
WEXITSTATUS(proc->status));
1158
974
} else if(WIFSIGNALED(proc->status)){
1159
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1160
" signal %d: %s\n", proc->name,
976
" signal %d\n", proc->name,
1161
977
(intmax_t) (proc->pid),
1162
WTERMSIG(proc->status),
1163
strsignal(WTERMSIG(proc->status)));
978
WTERMSIG(proc->status));
1164
979
} else if(WCOREDUMP(proc->status)){
1165
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1166
981
" core\n", proc->name, (intmax_t) (proc->pid));
1168
983
}
1169
984
1170
985
/* Remove the plugin */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic push
1174
#pragma GCC diagnostic ignored "-Wsign-conversion"
1175
#endif
1176
#endif
1177
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1178
-Wconversion in GNU libc
1179
before 2.16 */
1180
#if defined (__GNUC__) and defined (__GLIBC__)
1181
#if not __GLIBC_PREREQ(2, 16)
1182
#pragma GCC diagnostic pop
1183
#endif
1184
#endif
986
FD_CLR(proc->fd, &rfds_all);
1185
987
1186
988
/* Block signal while modifying process_list */
1187
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1188
(SIG_BLOCK,
1189
&sigchld_action.sa_mask,
1190
NULL));
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1191
990
if(ret < 0){
1192
error(0, errno, "sigprocmask");
1193
exitstatus = EX_OSERR;
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
1194
993
goto fallback;
1195
994
}
1196
995
1199
998
proc = next_plugin;
1200
999
1201
1000
/* We are done modifying process list, so unblock signal */
1202
ret = (int)(TEMP_FAILURE_RETRY
1203
(sigprocmask(SIG_UNBLOCK,
1204
&sigchld_action.sa_mask, NULL)));
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1205
1003
if(ret < 0){
1206
error(0, errno, "sigprocmask");
1207
exitstatus = EX_OSERR;
1004
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1208
1006
goto fallback;
1209
1007
}
1210
1008
1220
1018
bool bret = print_out_password(proc->buffer,
1221
1019
proc->buffer_length);
1222
1020
if(not bret){
1223
error(0, errno, "print_out_password");
1224
exitstatus = EX_IOERR;
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
1225
1023
}
1226
1024
goto fallback;
1227
1025
}
1228
1026
1229
1027
/* This process has not completed. Does it have any output? */
1230
#if defined (__GNUC__) and defined (__GLIBC__)
1231
#if not __GLIBC_PREREQ(2, 16)
1232
#pragma GCC diagnostic push
1233
#pragma GCC diagnostic ignored "-Wsign-conversion"
1234
#endif
1235
#endif
1236
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1237
warning from
1238
-Wconversion
1239
in GNU libc
1240
before
1241
2.16 */
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic pop
1245
#endif
1246
#endif
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1247
1029
/* This process had nothing to say at this time */
1248
1030
proc = proc->next;
1249
1031
continue;
1250
1032
}
1251
1033
/* Before reading, make the process' data buffer large enough */
1252
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1253
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1254
+ (size_t) BUFFER_SIZE);
1255
if(new_buffer == NULL){
1256
error(0, errno, "malloc");
1257
exitstatus = EX_OSERR;
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
1038
perror("malloc");
1039
exitstatus = EXIT_FAILURE;
1258
1040
goto fallback;
1259
1041
}
1260
proc->buffer = new_buffer;
1261
1042
proc->buffer_size += BUFFER_SIZE;
1262
1043
}
1263
1044
/* Read from the process */
1264
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1265
proc->buffer
1266
+ proc->buffer_length,
1267
BUFFER_SIZE));
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1268
1047
if(sret < 0){
1269
1048
/* Read error from this process; ignore the error */
1270
1049
proc = proc->next;
1282
1061
1283
1062
fallback:
1284
1063
1285
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1286
and exitstatus != EX_OK)){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1287
1065
/* Fallback if all plugins failed, none are found or an error
1288
1066
occured */
1289
1067
bool bret;
1297
1075
}
1298
1076
bret = print_out_password(passwordbuffer, len);
1299
1077
if(not bret){
1300
error(0, errno, "print_out_password");
1301
exitstatus = EX_IOERR;
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1302
1080
}
1303
1081
}
1304
1082
1305
1083
/* Restore old signal handler */
1306
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1307
1085
if(ret == -1){
1308
error(0, errno, "sigaction");
1309
exitstatus = EX_OSERR;
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1310
1088
}
1311
1089
1312
1090
if(custom_argv != NULL){
1327
1105
ret = kill(p->pid, SIGTERM);
1328
1106
if(ret == -1 and errno != ESRCH){
1329
1107
/* Set-uid proccesses might not get closed */
1330
error(0, errno, "kill");
1108
perror("kill");
1331
1109
}
1332
1110
}
1333
1111
}
1334
1112
1335
1113
/* Wait for any remaining child processes to terminate */
1336
do {
1114
do{
1337
1115
ret = wait(NULL);
1338
1116
} while(ret >= 0);
1339
1117
if(errno != ECHILD){
1340
error(0, errno, "wait");
1118
perror("wait");
1341
1119
}
1342
1120
1343
1121
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0