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- Committer: Teddy Hogeborn
- Date: 2009-09-19 17:41:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20090919174118-274yt9wptmtx0ykn
* plugins.d/password-prompt.c (main): Fix "-Wconversion" warning.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 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
O_CLOEXEC, pipe2() */
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(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
50
*/
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
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() */
51
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
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() */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
74
71
75
72
#define BUFFER_SIZE 256
76
73
77
74
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
76
81
77
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
79
84
80
typedef struct plugin{
85
81
char *name; /* can be NULL or any plugin name */
105
101
106
102
/* Gets an existing plugin based on name,
107
103
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
104
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
105
/* Check for exiting plugin with that name */
111
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
107
if((p->name == name)
113
108
or (p->name and name and (strcmp(p->name, name) == 0))){
128
123
copy_name = strdup(name);
129
124
} while(copy_name == NULL and errno == EINTR);
130
125
if(copy_name == NULL){
131
int e = errno;
132
126
free(new_plugin);
133
errno = e;
134
127
return NULL;
135
128
}
136
129
}
144
137
new_plugin->argv = malloc(sizeof(char *) * 2);
145
138
} while(new_plugin->argv == NULL and errno == EINTR);
146
139
if(new_plugin->argv == NULL){
147
int e = errno;
148
140
free(copy_name);
149
141
free(new_plugin);
150
errno = e;
151
142
return NULL;
152
143
}
153
144
new_plugin->argv[0] = copy_name;
157
148
new_plugin->environ = malloc(sizeof(char *));
158
149
} while(new_plugin->environ == NULL and errno == EINTR);
159
150
if(new_plugin->environ == NULL){
160
int e = errno;
161
151
free(copy_name);
162
152
free(new_plugin->argv);
163
153
free(new_plugin);
164
errno = e;
165
154
return NULL;
166
155
}
167
156
new_plugin->environ[0] = NULL;
172
161
}
173
162
174
163
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
164
static bool add_to_char_array(const char *new, char ***array,
177
165
int *len){
178
166
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
167
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
184
171
/* Malloc check */
185
if(new_array == NULL){
172
if(*array == NULL){
186
173
return false;
187
174
}
188
*array = new_array;
189
175
/* Make a copy of the new string */
190
176
char *copy;
191
177
do {
203
189
}
204
190
205
191
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
192
static bool add_argument(plugin *p, const char *arg){
208
193
if(p == NULL){
209
194
return false;
212
197
}
213
198
214
199
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
200
static bool add_environment(plugin *p, const char *def, bool replace){
217
201
if(p == NULL){
218
202
return false;
220
204
/* namelen = length of name of environment variable */
221
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
206
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
225
209
/* It already exists */
226
210
if(replace){
227
char *new_envdef;
211
char *new;
228
212
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
232
216
return false;
233
217
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
218
*e = new;
219
strcpy(*e, def);
236
220
}
237
221
return true;
238
222
}
240
224
return add_to_char_array(def, &(p->environ), &(p->envc));
241
225
}
242
226
243
#ifndef O_CLOEXEC
244
227
/*
245
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
229
* Descriptor Flags".
247
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
248
231
*/
249
__attribute__((warn_unused_result))
250
232
static int set_cloexec_flag(int fd){
251
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
234
/* If reading the flags failed, return error indication now. */
257
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
240
ret | FD_CLOEXEC));
259
241
}
260
#endif /* not O_CLOEXEC */
261
242
262
243
263
244
/* Mark processes as completed when they exit, and save their exit
277
258
/* No child processes */
278
259
break;
279
260
}
280
error(0, errno, "waitpid");
261
perror("waitpid");
281
262
}
282
263
283
264
/* A child exited, find it in process_list */
295
276
}
296
277
297
278
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
279
static bool print_out_password(const char *buffer, size_t length){
300
280
ssize_t ret;
301
281
for(size_t written = 0; written < length; written += (size_t)ret){
309
289
}
310
290
311
291
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
292
static void free_plugin(plugin *plugin_node){
314
293
315
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
347
326
348
327
int main(int argc, char *argv[]){
349
328
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
329
char *argfile = NULL;
352
330
FILE *conffp;
353
struct dirent **direntries = NULL;
331
size_t d_name_len;
332
DIR *dir = NULL;
333
struct dirent *dirst;
354
334
struct stat st;
355
335
fd_set rfds_all;
356
336
int ret, maxfd = 0;
364
344
.sa_flags = SA_NOCLDSTOP };
365
345
char **custom_argv = NULL;
366
346
int custom_argc = 0;
367
int dir_fd = -1;
368
347
369
348
/* Establish a signal handler */
370
349
sigemptyset(&sigchld_action.sa_mask);
371
350
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
351
if(ret == -1){
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
352
perror("sigaddset");
353
exitstatus = EXIT_FAILURE;
375
354
goto fallback;
376
355
}
377
356
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
357
if(ret == -1){
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
358
perror("sigaction");
359
exitstatus = EXIT_FAILURE;
381
360
goto fallback;
382
361
}
383
362
415
394
.doc = "Group ID the plugins will run as", .group = 3 },
416
395
{ .name = "debug", .key = 132,
417
396
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
422
/*
423
* These reproduce what we would get without ARGP_NO_HELP
424
*/
425
{ .name = "help", .key = '?',
426
.doc = "Give this help list", .group = -1 },
427
{ .name = "usage", .key = -3,
428
.doc = "Give a short usage message", .group = -1 },
429
{ .name = "version", .key = 'V',
430
.doc = "Print program version", .group = -1 },
431
397
{ .name = NULL }
432
398
};
433
399
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
errno = 0;
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
437
402
switch(key){
438
403
char *tmp;
439
intmax_t tmp_id;
404
intmax_t tmpmax;
440
405
case 'g': /* --global-options */
441
{
406
if(arg != NULL){
442
407
char *plugin_option;
443
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
410
continue;
411
}
444
412
if(not add_argument(getplugin(NULL), plugin_option)){
445
break;
413
perror("add_argument");
414
return ARGP_ERR_UNKNOWN;
446
415
}
447
416
}
448
errno = 0;
449
417
}
450
418
break;
451
419
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
420
if(arg == NULL){
421
break;
422
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
454
425
}
455
426
break;
456
427
case 'o': /* --options-for */
457
{
458
char *option_list = strchr(arg, ':');
459
if(option_list == NULL){
460
argp_error(state, "No colon in \"%s\"", arg);
461
errno = EINVAL;
462
break;
463
}
464
*option_list = '\0';
465
option_list++;
466
if(arg[0] == '\0'){
467
argp_error(state, "Empty plugin name");
468
errno = EINVAL;
469
break;
470
}
471
char *option;
472
while((option = strsep(&option_list, ",")) != NULL){
473
if(not add_argument(getplugin(arg), option)){
474
break;
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;
475
438
}
476
439
}
477
errno = 0;
478
440
}
479
441
break;
480
442
case 'E': /* --env-for */
443
if(arg == NULL){
444
break;
445
}
481
446
{
482
447
char *envdef = strchr(arg, ':');
483
448
if(envdef == NULL){
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
486
449
break;
487
450
}
488
451
*envdef = '\0';
489
envdef++;
490
if(arg[0] == '\0'){
491
argp_error(state, "Empty plugin name");
492
errno = EINVAL;
493
break;
494
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
452
if(not add_environment(getplugin(arg), envdef+1, true)){
453
perror("add_environment");
497
454
}
498
455
}
499
456
break;
500
457
case 'd': /* --disable */
501
{
458
if(arg != NULL){
502
459
plugin *p = getplugin(arg);
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
506
462
}
463
p->disabled = true;
507
464
}
508
465
break;
509
466
case 'e': /* --enable */
510
{
467
if(arg != NULL){
511
468
plugin *p = getplugin(arg);
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
515
471
}
472
p->disabled = false;
516
473
}
517
474
break;
518
475
case 128: /* --plugin-dir */
519
476
free(plugindir);
520
477
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
478
if(plugindir == NULL){
479
perror("strdup");
523
480
}
524
481
break;
525
482
case 129: /* --config-file */
526
483
/* This is already done by parse_opt_config_file() */
527
484
break;
528
485
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
530
488
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
532
argp_error(state, "Bad user ID number: \"%s\", using %"
533
PRIdMAX, arg, (intmax_t)uid);
534
break;
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;
535
494
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
538
495
break;
539
496
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
541
499
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
543
argp_error(state, "Bad group ID number: \"%s\", using %"
544
PRIdMAX, arg, (intmax_t)gid);
545
break;
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;
546
505
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
549
506
break;
550
507
case 132: /* --debug */
551
508
debug = true;
552
509
break;
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
560
/*
561
* These reproduce what we would get without ARGP_NO_HELP
562
*/
563
case '?': /* --help */
564
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
565
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
566
case -3: /* --usage */
567
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
568
argp_state_help(state, state->out_stream,
569
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
570
case 'V': /* --version */
571
fprintf(state->out_stream, "%s\n", argp_program_version);
572
exit(EXIT_SUCCESS);
573
break;
574
510
/*
575
511
* When adding more options before this line, remember to also add a
576
512
* "case" to the "parse_opt_config_file" function below.
579
515
/* Cryptsetup always passes an argument, which is an empty
580
516
string if "none" was specified in /etc/crypttab. So if
581
517
argument was empty, we ignore it silently. */
582
if(arg[0] == '\0'){
583
break;
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
584
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
585
524
default:
586
525
return ARGP_ERR_UNKNOWN;
587
526
}
588
return errno; /* Set to 0 at start */
527
return 0;
589
528
}
590
529
591
530
/* This option parser is the same as parse_opt() above, except it
593
532
error_t parse_opt_config_file(int key, char *arg,
594
533
__attribute__((unused))
595
534
struct argp_state *state){
596
errno = 0;
597
535
switch(key){
598
536
case 'g': /* --global-options */
599
537
case 'G': /* --global-env */
606
544
case 129: /* --config-file */
607
545
free(argfile);
608
546
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
547
if(argfile == NULL){
548
perror("strdup");
611
549
}
612
550
break;
613
551
case 130: /* --userid */
614
552
case 131: /* --groupid */
615
553
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
620
554
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
621
556
break;
622
557
default:
623
558
return ARGP_ERR_UNKNOWN;
624
559
}
625
return errno;
560
return 0;
626
561
}
627
562
628
563
struct argp argp = { .options = options,
632
567
633
568
/* Parse using parse_opt_config_file() in order to get the custom
634
569
config file location, if any. */
635
ret = argp_parse(&argp, argc, argv,
636
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
637
NULL, NULL);
638
switch(ret){
639
case 0:
640
break;
641
case ENOMEM:
642
default:
643
errno = ret;
644
error(0, errno, "argp_parse");
645
exitstatus = EX_OSERR;
646
goto fallback;
647
case EINVAL:
648
exitstatus = EX_USAGE;
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;
649
574
goto fallback;
650
575
}
651
576
668
593
custom_argc = 1;
669
594
custom_argv = malloc(sizeof(char*) * 2);
670
595
if(custom_argv == NULL){
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
673
598
goto fallback;
674
599
}
675
600
custom_argv[0] = argv[0];
691
616
}
692
617
new_arg = strdup(p);
693
618
if(new_arg == NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
696
621
free(org_line);
697
622
goto fallback;
698
623
}
699
624
700
625
custom_argc += 1;
701
{
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
707
free(new_arg);
708
free(org_line);
709
goto fallback;
710
} else {
711
custom_argv = new_argv;
712
}
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;
713
633
}
714
634
custom_argv[custom_argc-1] = new_arg;
715
635
custom_argv[custom_argc] = NULL;
719
639
ret = fclose(conffp);
720
640
} while(ret == EOF and errno == EINTR);
721
641
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
724
644
goto fallback;
725
645
}
726
646
free(org_line);
728
648
/* Check for harmful errors and go to fallback. Other errors might
729
649
not affect opening plugins */
730
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
651
perror("fopen");
652
exitstatus = EXIT_FAILURE;
733
653
goto fallback;
734
654
}
735
655
}
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
738
658
if(custom_argv != NULL){
739
ret = argp_parse(&argp, custom_argc, custom_argv,
740
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
741
NULL, NULL);
742
switch(ret){
743
case 0:
744
break;
745
case ENOMEM:
746
default:
747
errno = ret;
748
error(0, errno, "argp_parse");
749
exitstatus = EX_OSERR;
750
goto fallback;
751
case EINVAL:
752
exitstatus = EX_CONFIG;
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;
753
664
goto fallback;
754
665
}
755
666
}
756
667
757
668
/* Parse actual command line arguments, to let them override the
758
669
config file */
759
ret = argp_parse(&argp, argc, argv,
760
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
761
NULL, NULL);
762
switch(ret){
763
case 0:
764
break;
765
case ENOMEM:
766
default:
767
errno = ret;
768
error(0, errno, "argp_parse");
769
exitstatus = EX_OSERR;
770
goto fallback;
771
case EINVAL:
772
exitstatus = EX_USAGE;
773
goto fallback;
774
}
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
791
}
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;
674
goto fallback;
792
675
}
793
676
794
677
if(debug){
795
for(plugin *p = plugin_list; p != NULL; p = p->next){
678
for(plugin *p = plugin_list; p != NULL; p=p->next){
796
679
fprintf(stderr, "Plugin: %s has %d arguments\n",
797
680
p->name ? p->name : "Global", p->argc - 1);
798
681
for(char **a = p->argv; *a != NULL; a++){
805
688
}
806
689
}
807
690
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<https://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
813
if(errno != ENOENT){
814
error(0, errno, "open(\"" PDIR "\")");
815
}
816
} else {
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
818
if(ret == -1){
819
error(0, errno, "fstat");
820
} else {
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
823
if(ret == -1){
824
error(0, errno, "fchown");
825
}
826
}
827
}
828
close(plugindir_fd);
829
}
830
}
831
832
/* Lower permissions */
833
ret = setgid(gid);
691
/* Strip permissions down to nobody */
692
setgid(gid);
834
693
if(ret == -1){
835
error(0, errno, "setgid");
694
perror("setgid");
836
695
}
837
696
ret = setuid(uid);
838
697
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
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 */
843
714
{
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
845
#ifdef O_CLOEXEC
846
O_CLOEXEC
847
#else /* not O_CLOEXEC */
848
0
849
#endif /* not O_CLOEXEC */
850
);
851
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
854
goto fallback;
855
}
856
857
#ifndef O_CLOEXEC
858
/* Set the FD_CLOEXEC flag on the directory */
859
ret = set_cloexec_flag(dir_fd);
860
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
863
goto fallback;
864
}
865
#endif /* O_CLOEXEC */
866
}
867
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", 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, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
882
!= FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
886
}
887
return 0;
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;
888
722
}
889
723
}
890
return 1;
891
}
892
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
894
alphasort);
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
897
direntries = NULL;
898
exitstatus = EX_OSERR;
899
goto fallback;
900
724
}
901
725
902
726
FD_ZERO(&rfds_all);
903
727
904
728
/* Read and execute any executable in the plugin directory*/
905
for(int i = 0; i < numplugins; i++){
906
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
908
if(plugin_fd == -1){
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
729
while(true){
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
733
734
/* All directory entries have been processed */
735
if(dirst == NULL){
736
if(errno == EBADF){
737
perror("readdir");
738
exitstatus = EXIT_FAILURE;
739
goto fallback;
740
}
741
break;
742
}
743
744
d_name_len = strlen(dirst->d_name);
745
746
/* Ignore dotfiles, backup files and other junk */
747
{
748
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
785
if(bad_name){
786
continue;
787
}
788
}
789
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));
798
}
799
if(ret < 0){
800
perror("asprintf");
911
801
continue;
912
802
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
803
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
914
805
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
806
perror("stat");
807
free(filename);
918
808
continue;
919
809
}
920
810
921
811
/* Ignore non-executable files */
922
812
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
814
if(debug){
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
" with bad type or mode\n", filename);
930
817
}
931
close(plugin_fd);
932
free(direntries[i]);
818
free(filename);
933
819
continue;
934
820
}
935
821
936
plugin *p = getplugin(direntries[i]->d_name);
822
plugin *p = getplugin(dirst->d_name);
937
823
if(p == NULL){
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
824
perror("getplugin");
825
free(filename);
941
826
continue;
942
827
}
943
828
if(p->disabled){
944
829
if(debug){
945
830
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
831
dirst->d_name);
947
832
}
948
close(plugin_fd);
949
free(direntries[i]);
833
free(filename);
950
834
continue;
951
835
}
952
836
{
955
839
if(g != NULL){
956
840
for(char **a = g->argv + 1; *a != NULL; a++){
957
841
if(not add_argument(p, *a)){
958
error(0, errno, "add_argument");
842
perror("add_argument");
959
843
}
960
844
}
961
845
/* Add global environment variables */
962
846
for(char **e = g->environ; *e != NULL; e++){
963
847
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
848
perror("add_environment");
965
849
}
966
850
}
967
851
}
968
852
}
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
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. */
971
856
if(p->environ[0] != NULL){
972
857
for(char **e = environ; *e != NULL; e++){
973
858
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
859
perror("add_environment");
975
860
}
976
861
}
977
862
}
978
863
979
864
int pipefd[2];
980
#ifndef O_CLOEXEC
981
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
985
866
if(ret == -1){
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
990
}
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
#ifndef O_CLOEXEC
867
perror("pipe");
868
exitstatus = EXIT_FAILURE;
869
goto fallback;
870
}
1001
871
/* Ask OS to automatic close the pipe on exec */
1002
872
ret = set_cloexec_flag(pipefd[0]);
1003
873
if(ret < 0){
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
874
perror("set_cloexec_flag");
875
exitstatus = EXIT_FAILURE;
1009
876
goto fallback;
1010
877
}
1011
878
ret = set_cloexec_flag(pipefd[1]);
1012
879
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
880
perror("set_cloexec_flag");
881
exitstatus = EXIT_FAILURE;
1018
882
goto fallback;
1019
883
}
1020
#endif /* not O_CLOEXEC */
1021
884
/* Block SIGCHLD until process is safely in process list */
1022
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
886
&sigchld_action.sa_mask,
1024
887
NULL));
1025
888
if(ret < 0){
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
889
perror("sigprocmask");
890
exitstatus = EXIT_FAILURE;
1029
891
goto fallback;
1030
892
}
1031
893
/* Starting a new process to be watched */
1034
896
pid = fork();
1035
897
} while(pid == -1 and errno == EINTR);
1036
898
if(pid == -1){
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
899
perror("fork");
900
exitstatus = EXIT_FAILURE;
1044
901
goto fallback;
1045
902
}
1046
903
if(pid == 0){
1047
904
/* this is the child process */
1048
905
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1049
906
if(ret < 0){
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
907
perror("sigaction");
908
_exit(EXIT_FAILURE);
1052
909
}
1053
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
911
if(ret < 0){
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
912
perror("sigprocmask");
913
_exit(EXIT_FAILURE);
1057
914
}
1058
915
1059
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1060
917
if(ret == -1){
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
918
perror("dup2");
919
_exit(EXIT_FAILURE);
1063
920
}
1064
921
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1070
_exit(EX_OSERR);
922
if(dirfd(dir) < 0){
923
/* If dir has no file descriptor, we could not set FD_CLOEXEC
924
above and must now close it manually here. */
925
closedir(dir);
926
}
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
}
1071
937
}
1072
938
/* no return */
1073
939
}
1074
940
/* Parent process */
1075
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
943
free(filename);
944
plugin *new_plugin = getplugin(dirst->d_name);
1078
945
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
946
perror("getplugin");
1080
947
ret = (int)(TEMP_FAILURE_RETRY
1081
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
949
NULL)));
1083
950
if(ret < 0){
1084
error(0, errno, "sigprocmask");
951
perror("sigprocmask");
1085
952
}
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
953
exitstatus = EXIT_FAILURE;
1088
954
goto fallback;
1089
955
}
1090
free(direntries[i]);
1091
956
1092
957
new_plugin->pid = pid;
1093
958
new_plugin->fd = pipefd[0];
1098
963
&sigchld_action.sa_mask,
1099
964
NULL));
1100
965
if(ret < 0){
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
966
perror("sigprocmask");
967
exitstatus = EXIT_FAILURE;
1103
968
goto fallback;
1104
969
}
1105
970
1110
975
}
1111
976
}
1112
977
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
978
TEMP_FAILURE_RETRY(closedir(dir));
979
dir = NULL;
1117
980
free_plugin(getplugin(NULL));
1118
981
1119
982
for(plugin *p = plugin_list; p != NULL; p = p->next){
1132
995
fd_set rfds = rfds_all;
1133
996
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1134
997
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
998
perror("select");
999
exitstatus = EXIT_FAILURE;
1137
1000
goto fallback;
1138
1001
}
1139
1002
/* OK, now either a process completed, or something can be read
1158
1021
(intmax_t) (proc->pid),
1159
1022
WTERMSIG(proc->status),
1160
1023
strsignal(WTERMSIG(proc->status)));
1024
} else if(WCOREDUMP(proc->status)){
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
1161
1027
}
1162
1028
}
1163
1029
1170
1036
&sigchld_action.sa_mask,
1171
1037
NULL));
1172
1038
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
1039
perror("sigprocmask");
1040
exitstatus = EXIT_FAILURE;
1175
1041
goto fallback;
1176
1042
}
1177
1043
1184
1050
(sigprocmask(SIG_UNBLOCK,
1185
1051
&sigchld_action.sa_mask, NULL)));
1186
1052
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1053
perror("sigprocmask");
1054
exitstatus = EXIT_FAILURE;
1189
1055
goto fallback;
1190
1056
}
1191
1057
1201
1067
bool bret = print_out_password(proc->buffer,
1202
1068
proc->buffer_length);
1203
1069
if(not bret){
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
1070
perror("print_out_password");
1071
exitstatus = EXIT_FAILURE;
1206
1072
}
1207
1073
goto fallback;
1208
1074
}
1215
1081
}
1216
1082
/* Before reading, make the process' data buffer large enough */
1217
1083
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
1084
proc->buffer = realloc(proc->buffer, proc->buffer_size
1085
+ (size_t) BUFFER_SIZE);
1086
if(proc->buffer == NULL){
1087
perror("malloc");
1088
exitstatus = EXIT_FAILURE;
1223
1089
goto fallback;
1224
1090
}
1225
proc->buffer = new_buffer;
1226
1091
proc->buffer_size += BUFFER_SIZE;
1227
1092
}
1228
1093
/* Read from the process */
1247
1112
1248
1113
fallback:
1249
1114
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1252
1116
/* Fallback if all plugins failed, none are found or an error
1253
1117
occured */
1254
1118
bool bret;
1262
1126
}
1263
1127
bret = print_out_password(passwordbuffer, len);
1264
1128
if(not bret){
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
1129
perror("print_out_password");
1130
exitstatus = EXIT_FAILURE;
1267
1131
}
1268
1132
}
1269
1133
1270
1134
/* Restore old signal handler */
1271
1135
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1272
1136
if(ret == -1){
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1137
perror("sigaction");
1138
exitstatus = EXIT_FAILURE;
1275
1139
}
1276
1140
1277
1141
if(custom_argv != NULL){
1281
1145
free(custom_argv);
1282
1146
}
1283
1147
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1148
if(dir != NULL){
1149
closedir(dir);
1288
1150
}
1289
1151
1290
1152
/* Kill the processes */
1294
1156
ret = kill(p->pid, SIGTERM);
1295
1157
if(ret == -1 and errno != ESRCH){
1296
1158
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1159
perror("kill");
1298
1160
}
1299
1161
}
1300
1162
}
1304
1166
ret = wait(NULL);
1305
1167
} while(ret >= 0);
1306
1168
if(errno != ECHILD){
1307
error(0, errno, "wait");
1169
perror("wait");
1308
1170
}
1309
1171
1310
1172
free_plugin_list();
1311
1173
1312
1174
free(plugindir);
1313
free(pluginhelperdir);
1314
1175
free(argfile);
1315
1176
1316
1177
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0