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- Committer: Teddy Hogeborn
- Date: 2014-06-14 02:57:16 UTC
- Revision ID: teddy@recompile.se-20140614025716-i6887rk3u1iy9l67
In plugin-runner, protect against a larger FD_SETSIZE than fd_set.
* plugin-runner.c (main): Before forking, check that the first FD from
pipe() does not exceed FD_SETSIZE.
* plugin-runner.c (main): Before forking, check that the first FD from
pipe() does not exceed FD_SETSIZE.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
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(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
41
WEXITSTATUS(), WTERMSIG(),
42
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
68
68
*/
69
69
#include <errno.h> /* errno, EBADF */
70
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
#include <fnmatch.h> /* fnmatch() */
71
76
72
77
#define BUFFER_SIZE 256
73
78
75
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
81
77
82
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
84
80
85
typedef struct plugin{
81
86
char *name; /* can be NULL or any plugin name */
101
106
102
107
/* Gets an existing plugin based on name,
103
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
104
110
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
111
/* Check for existing plugin with that name */
106
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
113
if((p->name == name)
108
114
or (p->name and name and (strcmp(p->name, name) == 0))){
123
129
copy_name = strdup(name);
124
130
} while(copy_name == NULL and errno == EINTR);
125
131
if(copy_name == NULL){
132
int e = errno;
126
133
free(new_plugin);
134
errno = e;
127
135
return NULL;
128
136
}
129
137
}
137
145
new_plugin->argv = malloc(sizeof(char *) * 2);
138
146
} while(new_plugin->argv == NULL and errno == EINTR);
139
147
if(new_plugin->argv == NULL){
148
int e = errno;
140
149
free(copy_name);
141
150
free(new_plugin);
151
errno = e;
142
152
return NULL;
143
153
}
144
154
new_plugin->argv[0] = copy_name;
148
158
new_plugin->environ = malloc(sizeof(char *));
149
159
} while(new_plugin->environ == NULL and errno == EINTR);
150
160
if(new_plugin->environ == NULL){
161
int e = errno;
151
162
free(copy_name);
152
163
free(new_plugin->argv);
153
164
free(new_plugin);
165
errno = e;
154
166
return NULL;
155
167
}
156
168
new_plugin->environ[0] = NULL;
161
173
}
162
174
163
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
164
177
static bool add_to_char_array(const char *new, char ***array,
165
178
int *len){
166
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
167
181
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
171
185
/* Malloc check */
172
if(*array == NULL){
186
if(new_array == NULL){
173
187
return false;
174
188
}
189
*array = new_array;
175
190
/* Make a copy of the new string */
176
191
char *copy;
177
192
do {
189
204
}
190
205
191
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
192
208
static bool add_argument(plugin *p, const char *arg){
193
209
if(p == NULL){
194
210
return false;
197
213
}
198
214
199
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
200
217
static bool add_environment(plugin *p, const char *def, bool replace){
201
218
if(p == NULL){
202
219
return false;
204
221
/* namelen = length of name of environment variable */
205
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
223
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
209
226
/* It already exists */
210
227
if(replace){
211
char *new;
228
char *new_envdef;
212
229
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
216
233
return false;
217
234
}
218
*e = new;
219
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
220
237
}
221
238
return true;
222
239
}
229
246
* Descriptor Flags".
230
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
231
248
*/
249
__attribute__((warn_unused_result))
232
250
static int set_cloexec_flag(int fd){
233
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
234
252
/* If reading the flags failed, return error indication now. */
258
276
/* No child processes */
259
277
break;
260
278
}
261
perror("waitpid");
279
error(0, errno, "waitpid");
262
280
}
263
281
264
282
/* A child exited, find it in process_list */
276
294
}
277
295
278
296
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
279
298
static bool print_out_password(const char *buffer, size_t length){
280
299
ssize_t ret;
281
300
for(size_t written = 0; written < length; written += (size_t)ret){
289
308
}
290
309
291
310
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
292
312
static void free_plugin(plugin *plugin_node){
293
313
294
314
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
328
348
char *plugindir = NULL;
329
349
char *argfile = NULL;
330
350
FILE *conffp;
331
size_t d_name_len;
332
351
DIR *dir = NULL;
333
352
struct dirent *dirst;
334
353
struct stat st;
344
363
.sa_flags = SA_NOCLDSTOP };
345
364
char **custom_argv = NULL;
346
365
int custom_argc = 0;
366
int dir_fd;
347
367
348
368
/* Establish a signal handler */
349
369
sigemptyset(&sigchld_action.sa_mask);
350
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
351
371
if(ret == -1){
352
perror("sigaddset");
353
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
354
374
goto fallback;
355
375
}
356
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
357
377
if(ret == -1){
358
perror("sigaction");
359
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
360
380
goto fallback;
361
381
}
362
382
394
414
.doc = "Group ID the plugins will run as", .group = 3 },
395
415
{ .name = "debug", .key = 132,
396
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
397
426
{ .name = NULL }
398
427
};
399
428
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
402
432
switch(key){
403
433
char *tmp;
404
intmax_t tmpmax;
434
intmax_t tmp_id;
405
435
case 'g': /* --global-options */
406
if(arg != NULL){
436
{
407
437
char *plugin_option;
408
438
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
410
continue;
411
}
412
439
if(not add_argument(getplugin(NULL), plugin_option)){
413
perror("add_argument");
414
return ARGP_ERR_UNKNOWN;
440
break;
415
441
}
416
442
}
443
errno = 0;
417
444
}
418
445
break;
419
446
case 'G': /* --global-env */
420
if(arg == NULL){
421
break;
422
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
425
449
}
426
450
break;
427
451
case 'o': /* --options-for */
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
438
470
}
439
471
}
472
errno = 0;
440
473
}
441
474
break;
442
475
case 'E': /* --env-for */
443
if(arg == NULL){
444
break;
445
}
446
476
{
447
477
char *envdef = strchr(arg, ':');
448
478
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
449
481
break;
450
482
}
451
483
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
453
perror("add_environment");
484
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
454
492
}
455
493
}
456
494
break;
457
495
case 'd': /* --disable */
458
if(arg != NULL){
496
{
459
497
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
462
501
}
463
p->disabled = true;
464
502
}
465
503
break;
466
504
case 'e': /* --enable */
467
if(arg != NULL){
505
{
468
506
plugin *p = getplugin(arg);
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
471
510
}
472
p->disabled = false;
473
511
}
474
512
break;
475
513
case 128: /* --plugin-dir */
476
514
free(plugindir);
477
515
plugindir = strdup(arg);
478
if(plugindir == NULL){
479
perror("strdup");
516
if(plugindir != NULL){
517
errno = 0;
480
518
}
481
519
break;
482
520
case 129: /* --config-file */
483
521
/* This is already done by parse_opt_config_file() */
484
522
break;
485
523
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
488
525
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
494
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
495
533
break;
496
534
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
499
536
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
505
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
506
544
break;
507
545
case 132: /* --debug */
508
546
debug = true;
509
547
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
510
562
/*
511
563
* When adding more options before this line, remember to also add a
512
564
* "case" to the "parse_opt_config_file" function below.
515
567
/* Cryptsetup always passes an argument, which is an empty
516
568
string if "none" was specified in /etc/crypttab. So if
517
569
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
570
if(arg[0] == '\0'){
571
break;
520
572
}
521
break;
522
case ARGP_KEY_END:
523
break;
524
573
default:
525
574
return ARGP_ERR_UNKNOWN;
526
575
}
527
return 0;
576
return errno; /* Set to 0 at start */
528
577
}
529
578
530
579
/* This option parser is the same as parse_opt() above, except it
532
581
error_t parse_opt_config_file(int key, char *arg,
533
582
__attribute__((unused))
534
583
struct argp_state *state){
584
errno = 0;
535
585
switch(key){
536
586
case 'g': /* --global-options */
537
587
case 'G': /* --global-env */
544
594
case 129: /* --config-file */
545
595
free(argfile);
546
596
argfile = strdup(arg);
547
if(argfile == NULL){
548
perror("strdup");
597
if(argfile != NULL){
598
errno = 0;
549
599
}
550
600
break;
551
601
case 130: /* --userid */
552
602
case 131: /* --groupid */
553
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
554
607
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
556
608
break;
557
609
default:
558
610
return ARGP_ERR_UNKNOWN;
559
611
}
560
return 0;
612
return errno;
561
613
}
562
614
563
615
struct argp argp = { .options = options,
567
619
568
620
/* Parse using parse_opt_config_file() in order to get the custom
569
621
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
574
636
goto fallback;
575
637
}
576
638
593
655
custom_argc = 1;
594
656
custom_argv = malloc(sizeof(char*) * 2);
595
657
if(custom_argv == NULL){
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
598
660
goto fallback;
599
661
}
600
662
custom_argv[0] = argv[0];
616
678
}
617
679
new_arg = strdup(p);
618
680
if(new_arg == NULL){
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
621
683
free(org_line);
622
684
goto fallback;
623
685
}
624
686
625
687
custom_argc += 1;
626
custom_argv = realloc(custom_argv, sizeof(char *)
627
* ((unsigned int) custom_argc + 1));
628
if(custom_argv == NULL){
629
perror("realloc");
630
exitstatus = EXIT_FAILURE;
631
free(org_line);
632
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
633
701
}
634
702
custom_argv[custom_argc-1] = new_arg;
635
703
custom_argv[custom_argc] = NULL;
639
707
ret = fclose(conffp);
640
708
} while(ret == EOF and errno == EINTR);
641
709
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
644
712
goto fallback;
645
713
}
646
714
free(org_line);
648
716
/* Check for harmful errors and go to fallback. Other errors might
649
717
not affect opening plugins */
650
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
perror("fopen");
652
exitstatus = EXIT_FAILURE;
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
653
721
goto fallback;
654
722
}
655
723
}
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
658
726
if(custom_argv != NULL){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
662
fprintf(stderr, "Unknown error while parsing arguments\n");
663
exitstatus = EXIT_FAILURE;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
664
741
goto fallback;
665
742
}
666
743
}
667
744
668
745
/* Parse actual command line arguments, to let them override the
669
746
config file */
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
674
761
goto fallback;
675
762
}
676
763
688
775
}
689
776
}
690
777
691
/* Strip permissions down to nobody */
692
setgid(gid);
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
693
804
if(ret == -1){
694
perror("setgid");
805
error(0, errno, "setgid");
695
806
}
696
807
ret = setuid(uid);
697
808
if(ret == -1){
698
perror("setuid");
699
}
700
701
if(plugindir == NULL){
702
dir = opendir(PDIR);
703
} else {
704
dir = opendir(plugindir);
705
}
706
707
if(dir == NULL){
708
perror("Could not open plugin dir");
709
exitstatus = EXIT_FAILURE;
710
goto fallback;
711
}
712
713
/* Set the FD_CLOEXEC flag on the directory, if possible */
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
714
813
{
715
int dir_fd = dirfd(dir);
716
if(dir_fd >= 0){
717
ret = set_cloexec_flag(dir_fd);
718
if(ret < 0){
719
perror("set_cloexec_flag");
720
exitstatus = EXIT_FAILURE;
721
goto fallback;
722
}
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
723
844
}
724
845
}
725
846
734
855
/* All directory entries have been processed */
735
856
if(dirst == NULL){
736
857
if(errno == EBADF){
737
perror("readdir");
738
exitstatus = EXIT_FAILURE;
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
739
860
goto fallback;
740
861
}
741
862
break;
742
863
}
743
864
744
d_name_len = strlen(dirst->d_name);
745
746
865
/* Ignore dotfiles, backup files and other junk */
747
866
{
748
867
bool bad_name = false;
749
750
const char const *bad_prefixes[] = { ".", "#", NULL };
751
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
753
".dpkg-old",
754
".dpkg-bak",
755
".dpkg-divert", NULL };
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
757
size_t pre_len = strlen(*pre);
758
if((d_name_len >= pre_len)
759
and strncmp((dirst->d_name), *pre, pre_len) == 0){
760
if(debug){
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad prefix %s\n", dirst->d_name, *pre);
763
}
764
bad_name = true;
765
break;
766
}
767
}
768
if(bad_name){
769
continue;
770
}
771
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
772
size_t suf_len = strlen(*suf);
773
if((d_name_len >= suf_len)
774
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
775
== 0)){
776
if(debug){
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
778
" with bad suffix %s\n", dirst->d_name, *suf);
779
}
780
bad_name = true;
781
break;
782
}
783
}
784
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
871
NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
886
}
887
bad_name = true;
888
break;
889
}
890
}
785
891
if(bad_name){
786
892
continue;
787
893
}
788
894
}
789
895
790
char *filename;
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
793
dirst->d_name));
794
} else {
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
796
plugindir,
797
dirst->d_name));
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
897
#ifdef O_CLOEXEC
898
O_CLOEXEC
899
#else /* not O_CLOEXEC */
900
0
901
#endif /* not O_CLOEXEC */
902
);
903
if(plugin_fd == -1){
904
error(0, errno, "Could not open plugin");
905
continue;
798
906
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
799
910
if(ret < 0){
800
perror("asprintf");
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
801
913
continue;
802
914
}
803
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
805
917
if(ret == -1){
806
perror("stat");
807
free(filename);
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
808
920
continue;
809
921
}
810
922
811
923
/* Ignore non-executable files */
812
924
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
814
927
if(debug){
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
817
931
}
818
free(filename);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
819
933
continue;
820
934
}
821
935
822
936
plugin *p = getplugin(dirst->d_name);
823
937
if(p == NULL){
824
perror("getplugin");
825
free(filename);
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
826
940
continue;
827
941
}
828
942
if(p->disabled){
830
944
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
831
945
dirst->d_name);
832
946
}
833
free(filename);
947
TEMP_FAILURE_RETRY(close(plugin_fd));
834
948
continue;
835
949
}
836
950
{
839
953
if(g != NULL){
840
954
for(char **a = g->argv + 1; *a != NULL; a++){
841
955
if(not add_argument(p, *a)){
842
perror("add_argument");
956
error(0, errno, "add_argument");
843
957
}
844
958
}
845
959
/* Add global environment variables */
846
960
for(char **e = g->environ; *e != NULL; e++){
847
961
if(not add_environment(p, *e, false)){
848
perror("add_environment");
962
error(0, errno, "add_environment");
849
963
}
850
964
}
851
965
}
852
966
}
853
/* If this plugin has any environment variables, we will call
854
using execve and need to duplicate the environment from this
855
process, too. */
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
856
969
if(p->environ[0] != NULL){
857
970
for(char **e = environ; *e != NULL; e++){
858
971
if(not add_environment(p, *e, false)){
859
perror("add_environment");
972
error(0, errno, "add_environment");
860
973
}
861
974
}
862
975
}
864
977
int pipefd[2];
865
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
979
if(ret == -1){
867
perror("pipe");
868
exitstatus = EXIT_FAILURE;
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
982
goto fallback;
983
}
984
if(pipefd[0] >= FD_SETSIZE){
985
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
986
FD_SETSIZE);
987
TEMP_FAILURE_RETRY(close(pipefd[0]));
988
TEMP_FAILURE_RETRY(close(pipefd[1]));
989
exitstatus = EX_OSERR;
869
990
goto fallback;
870
991
}
871
992
/* Ask OS to automatic close the pipe on exec */
872
993
ret = set_cloexec_flag(pipefd[0]);
873
994
if(ret < 0){
874
perror("set_cloexec_flag");
875
exitstatus = EXIT_FAILURE;
995
error(0, errno, "set_cloexec_flag");
996
TEMP_FAILURE_RETRY(close(pipefd[0]));
997
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
exitstatus = EX_OSERR;
876
999
goto fallback;
877
1000
}
878
1001
ret = set_cloexec_flag(pipefd[1]);
879
1002
if(ret < 0){
880
perror("set_cloexec_flag");
881
exitstatus = EXIT_FAILURE;
1003
error(0, errno, "set_cloexec_flag");
1004
TEMP_FAILURE_RETRY(close(pipefd[0]));
1005
TEMP_FAILURE_RETRY(close(pipefd[1]));
1006
exitstatus = EX_OSERR;
882
1007
goto fallback;
883
1008
}
884
1009
/* Block SIGCHLD until process is safely in process list */
886
1011
&sigchld_action.sa_mask,
887
1012
NULL));
888
1013
if(ret < 0){
889
perror("sigprocmask");
890
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "sigprocmask");
1015
exitstatus = EX_OSERR;
891
1016
goto fallback;
892
1017
}
893
1018
/* Starting a new process to be watched */
896
1021
pid = fork();
897
1022
} while(pid == -1 and errno == EINTR);
898
1023
if(pid == -1){
899
perror("fork");
900
exitstatus = EXIT_FAILURE;
1024
error(0, errno, "fork");
1025
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1026
&sigchld_action.sa_mask, NULL));
1027
TEMP_FAILURE_RETRY(close(pipefd[0]));
1028
TEMP_FAILURE_RETRY(close(pipefd[1]));
1029
exitstatus = EX_OSERR;
901
1030
goto fallback;
902
1031
}
903
1032
if(pid == 0){
904
1033
/* this is the child process */
905
1034
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
906
1035
if(ret < 0){
907
perror("sigaction");
908
_exit(EXIT_FAILURE);
1036
error(0, errno, "sigaction");
1037
_exit(EX_OSERR);
909
1038
}
910
1039
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
1040
if(ret < 0){
912
perror("sigprocmask");
913
_exit(EXIT_FAILURE);
1041
error(0, errno, "sigprocmask");
1042
_exit(EX_OSERR);
914
1043
}
915
1044
916
1045
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
917
1046
if(ret == -1){
918
perror("dup2");
919
_exit(EXIT_FAILURE);
1047
error(0, errno, "dup2");
1048
_exit(EX_OSERR);
920
1049
}
921
1050
922
1051
if(dirfd(dir) < 0){
924
1053
above and must now close it manually here. */
925
1054
closedir(dir);
926
1055
}
927
if(p->environ[0] == NULL){
928
if(execv(filename, p->argv) < 0){
929
perror("execv");
930
_exit(EXIT_FAILURE);
931
}
932
} else {
933
if(execve(filename, p->argv, p->environ) < 0){
934
perror("execve");
935
_exit(EXIT_FAILURE);
936
}
1056
if(fexecve(plugin_fd, p->argv,
1057
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1058
error(0, errno, "fexecve for %s/%s",
1059
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1060
_exit(EX_OSERR);
937
1061
}
938
1062
/* no return */
939
1063
}
940
1064
/* Parent process */
941
1065
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
1066
pipe */
943
free(filename);
1067
TEMP_FAILURE_RETRY(close(plugin_fd));
944
1068
plugin *new_plugin = getplugin(dirst->d_name);
945
1069
if(new_plugin == NULL){
946
perror("getplugin");
1070
error(0, errno, "getplugin");
947
1071
ret = (int)(TEMP_FAILURE_RETRY
948
1072
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
949
1073
NULL)));
950
1074
if(ret < 0){
951
perror("sigprocmask");
1075
error(0, errno, "sigprocmask");
952
1076
}
953
exitstatus = EXIT_FAILURE;
1077
exitstatus = EX_OSERR;
954
1078
goto fallback;
955
1079
}
956
1080
963
1087
&sigchld_action.sa_mask,
964
1088
NULL));
965
1089
if(ret < 0){
966
perror("sigprocmask");
967
exitstatus = EXIT_FAILURE;
1090
error(0, errno, "sigprocmask");
1091
exitstatus = EX_OSERR;
968
1092
goto fallback;
969
1093
}
970
1094
1095
#if defined (__GNUC__) and defined (__GLIBC__)
1096
#if not __GLIBC_PREREQ(2, 16)
1097
#pragma GCC diagnostic push
1098
#pragma GCC diagnostic ignored "-Wsign-conversion"
1099
#endif
1100
#endif
971
1101
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
972
-Wconversion */
1102
-Wconversion in GNU libc
1103
before 2.16 */
1104
#if defined (__GNUC__) and defined (__GLIBC__)
1105
#if not __GLIBC_PREREQ(2, 16)
1106
#pragma GCC diagnostic pop
1107
#endif
1108
#endif
973
1109
974
1110
if(maxfd < new_plugin->fd){
975
1111
maxfd = new_plugin->fd;
996
1132
fd_set rfds = rfds_all;
997
1133
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
998
1134
if(select_ret == -1 and errno != EINTR){
999
perror("select");
1000
exitstatus = EXIT_FAILURE;
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
1001
1137
goto fallback;
1002
1138
}
1003
1139
/* OK, now either a process completed, or something can be read
1029
1165
}
1030
1166
1031
1167
/* Remove the plugin */
1168
#if defined (__GNUC__) and defined (__GLIBC__)
1169
#if not __GLIBC_PREREQ(2, 16)
1170
#pragma GCC diagnostic push
1171
#pragma GCC diagnostic ignored "-Wsign-conversion"
1172
#endif
1173
#endif
1032
1174
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1033
-Wconversion */
1175
-Wconversion in GNU libc
1176
before 2.16 */
1177
#if defined (__GNUC__) and defined (__GLIBC__)
1178
#if not __GLIBC_PREREQ(2, 16)
1179
#pragma GCC diagnostic pop
1180
#endif
1181
#endif
1034
1182
1035
1183
/* Block signal while modifying process_list */
1036
1184
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1038
1186
&sigchld_action.sa_mask,
1039
1187
NULL));
1040
1188
if(ret < 0){
1041
perror("sigprocmask");
1042
exitstatus = EXIT_FAILURE;
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
1043
1191
goto fallback;
1044
1192
}
1045
1193
1052
1200
(sigprocmask(SIG_UNBLOCK,
1053
1201
&sigchld_action.sa_mask, NULL)));
1054
1202
if(ret < 0){
1055
perror("sigprocmask");
1056
exitstatus = EXIT_FAILURE;
1203
error(0, errno, "sigprocmask");
1204
exitstatus = EX_OSERR;
1057
1205
goto fallback;
1058
1206
}
1059
1207
1069
1217
bool bret = print_out_password(proc->buffer,
1070
1218
proc->buffer_length);
1071
1219
if(not bret){
1072
perror("print_out_password");
1073
exitstatus = EXIT_FAILURE;
1220
error(0, errno, "print_out_password");
1221
exitstatus = EX_IOERR;
1074
1222
}
1075
1223
goto fallback;
1076
1224
}
1077
1225
1078
1226
/* This process has not completed. Does it have any output? */
1227
#if defined (__GNUC__) and defined (__GLIBC__)
1228
#if not __GLIBC_PREREQ(2, 16)
1229
#pragma GCC diagnostic push
1230
#pragma GCC diagnostic ignored "-Wsign-conversion"
1231
#endif
1232
#endif
1079
1233
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1080
1234
warning from
1081
-Wconversion */
1235
-Wconversion
1236
in GNU libc
1237
before
1238
2.16 */
1239
#if defined (__GNUC__) and defined (__GLIBC__)
1240
#if not __GLIBC_PREREQ(2, 16)
1241
#pragma GCC diagnostic pop
1242
#endif
1243
#endif
1082
1244
/* This process had nothing to say at this time */
1083
1245
proc = proc->next;
1084
1246
continue;
1085
1247
}
1086
1248
/* Before reading, make the process' data buffer large enough */
1087
1249
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1088
proc->buffer = realloc(proc->buffer, proc->buffer_size
1089
+ (size_t) BUFFER_SIZE);
1090
if(proc->buffer == NULL){
1091
perror("malloc");
1092
exitstatus = EXIT_FAILURE;
1250
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1251
+ (size_t) BUFFER_SIZE);
1252
if(new_buffer == NULL){
1253
error(0, errno, "malloc");
1254
exitstatus = EX_OSERR;
1093
1255
goto fallback;
1094
1256
}
1257
proc->buffer = new_buffer;
1095
1258
proc->buffer_size += BUFFER_SIZE;
1096
1259
}
1097
1260
/* Read from the process */
1116
1279
1117
1280
fallback:
1118
1281
1119
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1282
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1283
and exitstatus != EX_OK)){
1120
1284
/* Fallback if all plugins failed, none are found or an error
1121
1285
occured */
1122
1286
bool bret;
1130
1294
}
1131
1295
bret = print_out_password(passwordbuffer, len);
1132
1296
if(not bret){
1133
perror("print_out_password");
1134
exitstatus = EXIT_FAILURE;
1297
error(0, errno, "print_out_password");
1298
exitstatus = EX_IOERR;
1135
1299
}
1136
1300
}
1137
1301
1138
1302
/* Restore old signal handler */
1139
1303
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1140
1304
if(ret == -1){
1141
perror("sigaction");
1142
exitstatus = EXIT_FAILURE;
1305
error(0, errno, "sigaction");
1306
exitstatus = EX_OSERR;
1143
1307
}
1144
1308
1145
1309
if(custom_argv != NULL){
1160
1324
ret = kill(p->pid, SIGTERM);
1161
1325
if(ret == -1 and errno != ESRCH){
1162
1326
/* Set-uid proccesses might not get closed */
1163
perror("kill");
1327
error(0, errno, "kill");
1164
1328
}
1165
1329
}
1166
1330
}
1170
1334
ret = wait(NULL);
1171
1335
} while(ret >= 0);
1172
1336
if(errno != ECHILD){
1173
perror("wait");
1337
error(0, errno, "wait");
1174
1338
}
1175
1339
1176
1340
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0