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- Committer: Teddy Hogeborn
- Date: 2016-02-28 20:26:27 UTC
- Revision ID: teddy@recompile.se-20160228202627-vls5dia6repq6ks2
Depend on the GNU C Library 2.16 or later
* INSTALL: Document dependency.
* plugin-runner.c: Remove #ifdefs for scandirat() and adding of
-Wsign-conversion for FD_SET, FD_CLR, and FD_ISSET.
* plugins.d/mandos-client.c: - '' -
* INSTALL: Document dependency.
* plugin-runner.c: Remove #ifdefs for scandirat() and adding of
-Wsign-conversion for FD_SET, FD_CLR, and FD_ISSET.
* plugins.d/mandos-client.c: - '' -
- files added:
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 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, pipe2() */
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
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
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() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
40
WEXITSTATUS(), WTERMSIG(),
42
41
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
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() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
58
57
#include <errno.h> /* errno */
59
58
#include <argp.h> /* struct argp_option, struct
60
59
argp_state, struct argp,
68
67
*/
69
68
#include <errno.h> /* errno, EBADF */
70
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
71
75
72
76
#define BUFFER_SIZE 256
73
77
74
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
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
}
224
241
return add_to_char_array(def, &(p->environ), &(p->envc));
225
242
}
226
243
244
#ifndef O_CLOEXEC
227
245
/*
228
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
247
* Descriptor Flags".
230
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
231
249
*/
250
__attribute__((warn_unused_result))
232
251
static int set_cloexec_flag(int fd){
233
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
234
253
/* If reading the flags failed, return error indication now. */
239
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
259
ret | FD_CLOEXEC));
241
260
}
261
#endif /* not O_CLOEXEC */
242
262
243
263
244
264
/* Mark processes as completed when they exit, and save their exit
258
278
/* No child processes */
259
279
break;
260
280
}
261
perror("waitpid");
281
error(0, errno, "waitpid");
262
282
}
263
283
264
284
/* A child exited, find it in process_list */
276
296
}
277
297
278
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
279
300
static bool print_out_password(const char *buffer, size_t length){
280
301
ssize_t ret;
281
302
for(size_t written = 0; written < length; written += (size_t)ret){
289
310
}
290
311
291
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
292
314
static void free_plugin(plugin *plugin_node){
293
315
294
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
326
348
327
349
int main(int argc, char *argv[]){
328
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
329
352
char *argfile = NULL;
330
353
FILE *conffp;
331
size_t d_name_len;
332
DIR *dir = NULL;
333
struct dirent *dirst;
354
struct dirent **direntries = NULL;
334
355
struct stat st;
335
356
fd_set rfds_all;
336
357
int ret, maxfd = 0;
344
365
.sa_flags = SA_NOCLDSTOP };
345
366
char **custom_argv = NULL;
346
367
int custom_argc = 0;
368
int dir_fd = -1;
347
369
348
370
/* Establish a signal handler */
349
371
sigemptyset(&sigchld_action.sa_mask);
350
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
351
373
if(ret == -1){
352
perror("sigaddset");
353
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
354
376
goto fallback;
355
377
}
356
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
357
379
if(ret == -1){
358
perror("sigaction");
359
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
360
382
goto fallback;
361
383
}
362
384
394
416
.doc = "Group ID the plugins will run as", .group = 3 },
395
417
{ .name = "debug", .key = 132,
396
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
397
432
{ .name = NULL }
398
433
};
399
434
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
402
438
switch(key){
403
439
char *tmp;
404
intmax_t tmpmax;
440
intmax_t tmp_id;
405
441
case 'g': /* --global-options */
406
if(arg != NULL){
442
{
407
443
char *plugin_option;
408
444
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
410
continue;
411
}
412
445
if(not add_argument(getplugin(NULL), plugin_option)){
413
perror("add_argument");
414
return ARGP_ERR_UNKNOWN;
446
break;
415
447
}
416
448
}
449
errno = 0;
417
450
}
418
451
break;
419
452
case 'G': /* --global-env */
420
if(arg == NULL){
421
break;
422
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
425
455
}
426
456
break;
427
457
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;
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
438
476
}
439
477
}
478
errno = 0;
440
479
}
441
480
break;
442
481
case 'E': /* --env-for */
443
if(arg == NULL){
444
break;
445
}
446
482
{
447
483
char *envdef = strchr(arg, ':');
448
484
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
449
487
break;
450
488
}
451
489
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
453
perror("add_environment");
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
454
498
}
455
499
}
456
500
break;
457
501
case 'd': /* --disable */
458
if(arg != NULL){
502
{
459
503
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
462
507
}
463
p->disabled = true;
464
508
}
465
509
break;
466
510
case 'e': /* --enable */
467
if(arg != NULL){
511
{
468
512
plugin *p = getplugin(arg);
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
471
516
}
472
p->disabled = false;
473
517
}
474
518
break;
475
519
case 128: /* --plugin-dir */
476
520
free(plugindir);
477
521
plugindir = strdup(arg);
478
if(plugindir == NULL){
479
perror("strdup");
522
if(plugindir != NULL){
523
errno = 0;
480
524
}
481
525
break;
482
526
case 129: /* --config-file */
483
527
/* This is already done by parse_opt_config_file() */
484
528
break;
485
529
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
530
tmp_id = strtoimax(arg, &tmp, 10);
488
531
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;
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
494
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
495
539
break;
496
540
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
541
tmp_id = strtoimax(arg, &tmp, 10);
499
542
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;
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
505
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
506
550
break;
507
551
case 132: /* --debug */
508
552
debug = true;
509
553
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
510
575
/*
511
576
* When adding more options before this line, remember to also add a
512
577
* "case" to the "parse_opt_config_file" function below.
515
580
/* Cryptsetup always passes an argument, which is an empty
516
581
string if "none" was specified in /etc/crypttab. So if
517
582
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
583
if(arg[0] == '\0'){
584
break;
520
585
}
521
break;
522
case ARGP_KEY_END:
523
break;
524
586
default:
525
587
return ARGP_ERR_UNKNOWN;
526
588
}
527
return 0;
589
return errno; /* Set to 0 at start */
528
590
}
529
591
530
592
/* This option parser is the same as parse_opt() above, except it
532
594
error_t parse_opt_config_file(int key, char *arg,
533
595
__attribute__((unused))
534
596
struct argp_state *state){
597
errno = 0;
535
598
switch(key){
536
599
case 'g': /* --global-options */
537
600
case 'G': /* --global-env */
544
607
case 129: /* --config-file */
545
608
free(argfile);
546
609
argfile = strdup(arg);
547
if(argfile == NULL){
548
perror("strdup");
610
if(argfile != NULL){
611
errno = 0;
549
612
}
550
613
break;
551
614
case 130: /* --userid */
552
615
case 131: /* --groupid */
553
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
554
621
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
556
622
break;
557
623
default:
558
624
return ARGP_ERR_UNKNOWN;
559
625
}
560
return 0;
626
return errno;
561
627
}
562
628
563
629
struct argp argp = { .options = options,
567
633
568
634
/* Parse using parse_opt_config_file() in order to get the custom
569
635
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;
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
574
650
goto fallback;
575
651
}
576
652
593
669
custom_argc = 1;
594
670
custom_argv = malloc(sizeof(char*) * 2);
595
671
if(custom_argv == NULL){
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
598
674
goto fallback;
599
675
}
600
676
custom_argv[0] = argv[0];
616
692
}
617
693
new_arg = strdup(p);
618
694
if(new_arg == NULL){
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
621
697
free(org_line);
622
698
goto fallback;
623
699
}
624
700
625
701
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;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
633
714
}
634
715
custom_argv[custom_argc-1] = new_arg;
635
716
custom_argv[custom_argc] = NULL;
639
720
ret = fclose(conffp);
640
721
} while(ret == EOF and errno == EINTR);
641
722
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
644
725
goto fallback;
645
726
}
646
727
free(org_line);
648
729
/* Check for harmful errors and go to fallback. Other errors might
649
730
not affect opening plugins */
650
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
perror("fopen");
652
exitstatus = EXIT_FAILURE;
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
653
734
goto fallback;
654
735
}
655
736
}
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
658
739
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;
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
664
754
goto fallback;
665
755
}
666
756
}
667
757
668
758
/* Parse actual command line arguments, to let them override the
669
759
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;
674
goto fallback;
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
792
}
675
793
}
676
794
677
795
if(debug){
688
806
}
689
807
}
690
808
691
/* Strip permissions down to nobody */
692
setgid(gid);
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
693
835
if(ret == -1){
694
perror("setgid");
836
error(0, errno, "setgid");
695
837
}
696
838
ret = setuid(uid);
697
839
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 */
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
714
844
{
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;
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
722
889
}
723
890
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
724
901
}
725
902
726
903
FD_ZERO(&rfds_all);
727
904
728
905
/* Read and execute any executable in the plugin directory*/
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");
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
801
912
continue;
802
913
}
803
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
805
915
if(ret == -1){
806
perror("stat");
807
free(filename);
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
808
919
continue;
809
920
}
810
921
811
922
/* Ignore non-executable files */
812
923
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
814
926
if(debug){
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
" with bad type or mode\n", filename);
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
817
931
}
818
free(filename);
932
close(plugin_fd);
933
free(direntries[i]);
819
934
continue;
820
935
}
821
936
822
plugin *p = getplugin(dirst->d_name);
937
plugin *p = getplugin(direntries[i]->d_name);
823
938
if(p == NULL){
824
perror("getplugin");
825
free(filename);
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
826
942
continue;
827
943
}
828
944
if(p->disabled){
829
945
if(debug){
830
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
831
dirst->d_name);
947
direntries[i]->d_name);
832
948
}
833
free(filename);
949
close(plugin_fd);
950
free(direntries[i]);
834
951
continue;
835
952
}
836
953
{
839
956
if(g != NULL){
840
957
for(char **a = g->argv + 1; *a != NULL; a++){
841
958
if(not add_argument(p, *a)){
842
perror("add_argument");
959
error(0, errno, "add_argument");
843
960
}
844
961
}
845
962
/* Add global environment variables */
846
963
for(char **e = g->environ; *e != NULL; e++){
847
964
if(not add_environment(p, *e, false)){
848
perror("add_environment");
965
error(0, errno, "add_environment");
849
966
}
850
967
}
851
968
}
852
969
}
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. */
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
856
972
if(p->environ[0] != NULL){
857
973
for(char **e = environ; *e != NULL; e++){
858
974
if(not add_environment(p, *e, false)){
859
perror("add_environment");
975
error(0, errno, "add_environment");
860
976
}
861
977
}
862
978
}
863
979
864
980
int pipefd[2];
981
#ifndef O_CLOEXEC
865
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
866
986
if(ret == -1){
867
perror("pipe");
868
exitstatus = EXIT_FAILURE;
869
goto fallback;
870
}
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
871
1002
/* Ask OS to automatic close the pipe on exec */
872
1003
ret = set_cloexec_flag(pipefd[0]);
873
1004
if(ret < 0){
874
perror("set_cloexec_flag");
875
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
876
1010
goto fallback;
877
1011
}
878
1012
ret = set_cloexec_flag(pipefd[1]);
879
1013
if(ret < 0){
880
perror("set_cloexec_flag");
881
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
882
1019
goto fallback;
883
1020
}
1021
#endif /* not O_CLOEXEC */
884
1022
/* Block SIGCHLD until process is safely in process list */
885
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
1024
&sigchld_action.sa_mask,
887
1025
NULL));
888
1026
if(ret < 0){
889
perror("sigprocmask");
890
exitstatus = EXIT_FAILURE;
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
891
1030
goto fallback;
892
1031
}
893
1032
/* Starting a new process to be watched */
896
1035
pid = fork();
897
1036
} while(pid == -1 and errno == EINTR);
898
1037
if(pid == -1){
899
perror("fork");
900
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
901
1045
goto fallback;
902
1046
}
903
1047
if(pid == 0){
904
1048
/* this is the child process */
905
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
906
1050
if(ret < 0){
907
perror("sigaction");
908
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
909
1053
}
910
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
1055
if(ret < 0){
912
perror("sigprocmask");
913
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
914
1058
}
915
1059
916
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
917
1061
if(ret == -1){
918
perror("dup2");
919
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
920
1064
}
921
1065
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
}
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
937
1072
}
938
1073
/* no return */
939
1074
}
940
1075
/* Parent process */
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);
1076
close(pipefd[1]); /* Close unused write end of pipe */
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
945
1079
if(new_plugin == NULL){
946
perror("getplugin");
1080
error(0, errno, "getplugin");
947
1081
ret = (int)(TEMP_FAILURE_RETRY
948
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
949
1083
NULL)));
950
1084
if(ret < 0){
951
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
952
1086
}
953
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
954
1089
goto fallback;
955
1090
}
1091
free(direntries[i]);
956
1092
957
1093
new_plugin->pid = pid;
958
1094
new_plugin->fd = pipefd[0];
963
1099
&sigchld_action.sa_mask,
964
1100
NULL));
965
1101
if(ret < 0){
966
perror("sigprocmask");
967
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
968
1104
goto fallback;
969
1105
}
970
1106
975
1111
}
976
1112
}
977
1113
978
TEMP_FAILURE_RETRY(closedir(dir));
979
dir = NULL;
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
980
1118
free_plugin(getplugin(NULL));
981
1119
982
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
995
1133
fd_set rfds = rfds_all;
996
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
997
1135
if(select_ret == -1 and errno != EINTR){
998
perror("select");
999
exitstatus = EXIT_FAILURE;
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
1000
1138
goto fallback;
1001
1139
}
1002
1140
/* OK, now either a process completed, or something can be read
1036
1174
&sigchld_action.sa_mask,
1037
1175
NULL));
1038
1176
if(ret < 0){
1039
perror("sigprocmask");
1040
exitstatus = EXIT_FAILURE;
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
1041
1179
goto fallback;
1042
1180
}
1043
1181
1050
1188
(sigprocmask(SIG_UNBLOCK,
1051
1189
&sigchld_action.sa_mask, NULL)));
1052
1190
if(ret < 0){
1053
perror("sigprocmask");
1054
exitstatus = EXIT_FAILURE;
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
1055
1193
goto fallback;
1056
1194
}
1057
1195
1067
1205
bool bret = print_out_password(proc->buffer,
1068
1206
proc->buffer_length);
1069
1207
if(not bret){
1070
perror("print_out_password");
1071
exitstatus = EXIT_FAILURE;
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
1072
1210
}
1073
1211
goto fallback;
1074
1212
}
1081
1219
}
1082
1220
/* Before reading, make the process' data buffer large enough */
1083
1221
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
1222
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1223
+ (size_t) BUFFER_SIZE);
1224
if(new_buffer == NULL){
1225
error(0, errno, "malloc");
1226
exitstatus = EX_OSERR;
1089
1227
goto fallback;
1090
1228
}
1229
proc->buffer = new_buffer;
1091
1230
proc->buffer_size += BUFFER_SIZE;
1092
1231
}
1093
1232
/* Read from the process */
1112
1251
1113
1252
fallback:
1114
1253
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1254
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1255
and exitstatus != EX_OK)){
1116
1256
/* Fallback if all plugins failed, none are found or an error
1117
1257
occured */
1118
1258
bool bret;
1126
1266
}
1127
1267
bret = print_out_password(passwordbuffer, len);
1128
1268
if(not bret){
1129
perror("print_out_password");
1130
exitstatus = EXIT_FAILURE;
1269
error(0, errno, "print_out_password");
1270
exitstatus = EX_IOERR;
1131
1271
}
1132
1272
}
1133
1273
1134
1274
/* Restore old signal handler */
1135
1275
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1136
1276
if(ret == -1){
1137
perror("sigaction");
1138
exitstatus = EXIT_FAILURE;
1277
error(0, errno, "sigaction");
1278
exitstatus = EX_OSERR;
1139
1279
}
1140
1280
1141
1281
if(custom_argv != NULL){
1145
1285
free(custom_argv);
1146
1286
}
1147
1287
1148
if(dir != NULL){
1149
closedir(dir);
1288
free(direntries);
1289
1290
if(dir_fd != -1){
1291
close(dir_fd);
1150
1292
}
1151
1293
1152
1294
/* Kill the processes */
1156
1298
ret = kill(p->pid, SIGTERM);
1157
1299
if(ret == -1 and errno != ESRCH){
1158
1300
/* Set-uid proccesses might not get closed */
1159
perror("kill");
1301
error(0, errno, "kill");
1160
1302
}
1161
1303
}
1162
1304
}
1166
1308
ret = wait(NULL);
1167
1309
} while(ret >= 0);
1168
1310
if(errno != ECHILD){
1169
perror("wait");
1311
error(0, errno, "wait");
1170
1312
}
1171
1313
1172
1314
free_plugin_list();
1173
1315
1174
1316
free(plugindir);
1317
free(pluginhelperdir);
1175
1318
free(argfile);
1176
1319
1177
1320
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0