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- Committer: Björn Påhlsson
- Date: 2009-09-21 21:57:23 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20090921215723-no1445t10clzl0e1
added documentation todo
- 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
41
WEXITSTATUS(), WTERMSIG(),
41
42
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
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
*/
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() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
57
58
#include <errno.h> /* errno */
58
59
#include <argp.h> /* struct argp_option, struct
59
60
argp_state, struct argp,
67
68
*/
68
69
#include <errno.h> /* errno, EBADF */
69
70
#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() */
75
71
76
72
#define BUFFER_SIZE 256
77
73
78
74
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
76
82
77
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
79
85
80
typedef struct plugin{
86
81
char *name; /* can be NULL or any plugin name */
106
101
107
102
/* Gets an existing plugin based on name,
108
103
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
104
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
105
/* Check for exiting plugin with that name */
112
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
107
if((p->name == name)
114
108
or (p->name and name and (strcmp(p->name, name) == 0))){
129
123
copy_name = strdup(name);
130
124
} while(copy_name == NULL and errno == EINTR);
131
125
if(copy_name == NULL){
132
int e = errno;
133
126
free(new_plugin);
134
errno = e;
135
127
return NULL;
136
128
}
137
129
}
145
137
new_plugin->argv = malloc(sizeof(char *) * 2);
146
138
} while(new_plugin->argv == NULL and errno == EINTR);
147
139
if(new_plugin->argv == NULL){
148
int e = errno;
149
140
free(copy_name);
150
141
free(new_plugin);
151
errno = e;
152
142
return NULL;
153
143
}
154
144
new_plugin->argv[0] = copy_name;
158
148
new_plugin->environ = malloc(sizeof(char *));
159
149
} while(new_plugin->environ == NULL and errno == EINTR);
160
150
if(new_plugin->environ == NULL){
161
int e = errno;
162
151
free(copy_name);
163
152
free(new_plugin->argv);
164
153
free(new_plugin);
165
errno = e;
166
154
return NULL;
167
155
}
168
156
new_plugin->environ[0] = NULL;
173
161
}
174
162
175
163
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
164
static bool add_to_char_array(const char *new, char ***array,
178
165
int *len){
179
166
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
167
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} 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);
185
171
/* Malloc check */
186
if(new_array == NULL){
172
if(*array == NULL){
187
173
return false;
188
174
}
189
*array = new_array;
190
175
/* Make a copy of the new string */
191
176
char *copy;
192
177
do {
204
189
}
205
190
206
191
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
192
static bool add_argument(plugin *p, const char *arg){
209
193
if(p == NULL){
210
194
return false;
213
197
}
214
198
215
199
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
200
static bool add_environment(plugin *p, const char *def, bool replace){
218
201
if(p == NULL){
219
202
return false;
221
204
/* namelen = length of name of environment variable */
222
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
206
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
226
209
/* It already exists */
227
210
if(replace){
228
char *new_envdef;
211
char *new;
229
212
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
233
216
return false;
234
217
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
218
*e = new;
219
strcpy(*e, def);
237
220
}
238
221
return true;
239
222
}
241
224
return add_to_char_array(def, &(p->environ), &(p->envc));
242
225
}
243
226
244
#ifndef O_CLOEXEC
245
227
/*
246
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
229
* Descriptor Flags".
248
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
249
231
*/
250
__attribute__((warn_unused_result))
251
232
static int set_cloexec_flag(int fd){
252
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
253
234
/* If reading the flags failed, return error indication now. */
258
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
240
ret | FD_CLOEXEC));
260
241
}
261
#endif /* not O_CLOEXEC */
262
242
263
243
264
244
/* Mark processes as completed when they exit, and save their exit
278
258
/* No child processes */
279
259
break;
280
260
}
281
error(0, errno, "waitpid");
261
perror("waitpid");
282
262
}
283
263
284
264
/* A child exited, find it in process_list */
296
276
}
297
277
298
278
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
279
static bool print_out_password(const char *buffer, size_t length){
301
280
ssize_t ret;
302
281
for(size_t written = 0; written < length; written += (size_t)ret){
310
289
}
311
290
312
291
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
292
static void free_plugin(plugin *plugin_node){
315
293
316
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
348
326
349
327
int main(int argc, char *argv[]){
350
328
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
329
char *argfile = NULL;
353
330
FILE *conffp;
354
struct dirent **direntries = NULL;
331
size_t d_name_len;
332
DIR *dir = NULL;
333
struct dirent *dirst;
355
334
struct stat st;
356
335
fd_set rfds_all;
357
336
int ret, maxfd = 0;
365
344
.sa_flags = SA_NOCLDSTOP };
366
345
char **custom_argv = NULL;
367
346
int custom_argc = 0;
368
int dir_fd = -1;
369
347
370
348
/* Establish a signal handler */
371
349
sigemptyset(&sigchld_action.sa_mask);
372
350
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
351
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
352
perror("sigaddset");
353
exitstatus = EXIT_FAILURE;
376
354
goto fallback;
377
355
}
378
356
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
357
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
358
perror("sigaction");
359
exitstatus = EXIT_FAILURE;
382
360
goto fallback;
383
361
}
384
362
416
394
.doc = "Group ID the plugins will run as", .group = 3 },
417
395
{ .name = "debug", .key = 132,
418
396
.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 },
432
397
{ .name = NULL }
433
398
};
434
399
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
438
402
switch(key){
439
403
char *tmp;
440
intmax_t tmp_id;
404
intmax_t tmpmax;
441
405
case 'g': /* --global-options */
442
{
406
if(arg != NULL){
443
407
char *plugin_option;
444
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
410
continue;
411
}
445
412
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
413
perror("add_argument");
414
return ARGP_ERR_UNKNOWN;
447
415
}
448
416
}
449
errno = 0;
450
417
}
451
418
break;
452
419
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
420
if(arg == NULL){
421
break;
422
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
455
425
}
456
426
break;
457
427
case 'o': /* --options-for */
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;
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;
476
438
}
477
439
}
478
errno = 0;
479
440
}
480
441
break;
481
442
case 'E': /* --env-for */
443
if(arg == NULL){
444
break;
445
}
482
446
{
483
447
char *envdef = strchr(arg, ':');
484
448
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
449
break;
488
450
}
489
451
*envdef = '\0';
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;
452
if(not add_environment(getplugin(arg), envdef+1, true)){
453
perror("add_environment");
498
454
}
499
455
}
500
456
break;
501
457
case 'd': /* --disable */
502
{
458
if(arg != NULL){
503
459
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
507
462
}
463
p->disabled = true;
508
464
}
509
465
break;
510
466
case 'e': /* --enable */
511
{
467
if(arg != NULL){
512
468
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
516
471
}
472
p->disabled = false;
517
473
}
518
474
break;
519
475
case 128: /* --plugin-dir */
520
476
free(plugindir);
521
477
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
478
if(plugindir == NULL){
479
perror("strdup");
524
480
}
525
481
break;
526
482
case 129: /* --config-file */
527
483
/* This is already done by parse_opt_config_file() */
528
484
break;
529
485
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
531
488
if(errno != 0 or tmp == arg or *tmp != '\0'
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;
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;
536
494
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
495
break;
540
496
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
542
499
if(errno != 0 or tmp == arg or *tmp != '\0'
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;
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;
547
505
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
506
break;
551
507
case 132: /* --debug */
552
508
debug = true;
553
509
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;
575
510
/*
576
511
* When adding more options before this line, remember to also add a
577
512
* "case" to the "parse_opt_config_file" function below.
580
515
/* Cryptsetup always passes an argument, which is an empty
581
516
string if "none" was specified in /etc/crypttab. So if
582
517
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
585
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
586
524
default:
587
525
return ARGP_ERR_UNKNOWN;
588
526
}
589
return errno; /* Set to 0 at start */
527
return 0;
590
528
}
591
529
592
530
/* This option parser is the same as parse_opt() above, except it
594
532
error_t parse_opt_config_file(int key, char *arg,
595
533
__attribute__((unused))
596
534
struct argp_state *state){
597
errno = 0;
598
535
switch(key){
599
536
case 'g': /* --global-options */
600
537
case 'G': /* --global-env */
607
544
case 129: /* --config-file */
608
545
free(argfile);
609
546
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
547
if(argfile == NULL){
548
perror("strdup");
612
549
}
613
550
break;
614
551
case 130: /* --userid */
615
552
case 131: /* --groupid */
616
553
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
554
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
622
556
break;
623
557
default:
624
558
return ARGP_ERR_UNKNOWN;
625
559
}
626
return errno;
560
return 0;
627
561
}
628
562
629
563
struct argp argp = { .options = options,
633
567
634
568
/* Parse using parse_opt_config_file() in order to get the custom
635
569
config file location, if any. */
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;
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;
650
574
goto fallback;
651
575
}
652
576
669
593
custom_argc = 1;
670
594
custom_argv = malloc(sizeof(char*) * 2);
671
595
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
674
598
goto fallback;
675
599
}
676
600
custom_argv[0] = argv[0];
692
616
}
693
617
new_arg = strdup(p);
694
618
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
697
621
free(org_line);
698
622
goto fallback;
699
623
}
700
624
701
625
custom_argc += 1;
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
}
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;
714
633
}
715
634
custom_argv[custom_argc-1] = new_arg;
716
635
custom_argv[custom_argc] = NULL;
720
639
ret = fclose(conffp);
721
640
} while(ret == EOF and errno == EINTR);
722
641
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
725
644
goto fallback;
726
645
}
727
646
free(org_line);
729
648
/* Check for harmful errors and go to fallback. Other errors might
730
649
not affect opening plugins */
731
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
651
perror("fopen");
652
exitstatus = EXIT_FAILURE;
734
653
goto fallback;
735
654
}
736
655
}
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
739
658
if(custom_argv != NULL){
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;
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;
754
664
goto fallback;
755
665
}
756
666
}
757
667
758
668
/* Parse actual command line arguments, to let them override the
759
669
config file */
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
}
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;
793
675
}
794
676
795
677
if(debug){
806
688
}
807
689
}
808
690
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);
691
/* Strip permissions down to nobody */
692
setgid(gid);
835
693
if(ret == -1){
836
error(0, errno, "setgid");
694
perror("setgid");
837
695
}
838
696
ret = setuid(uid);
839
697
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* 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 */
844
714
{
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;
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;
889
722
}
890
723
}
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;
901
724
}
902
725
903
726
FD_ZERO(&rfds_all);
904
727
905
728
/* Read and execute any executable in the plugin directory*/
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]);
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");
912
801
continue;
913
802
}
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
803
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
915
805
if(ret == -1){
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
806
perror("stat");
807
free(filename);
919
808
continue;
920
809
}
921
810
922
811
/* Ignore non-executable files */
923
812
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
926
814
if(debug){
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);
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
" with bad type or mode\n", filename);
931
817
}
932
close(plugin_fd);
933
free(direntries[i]);
818
free(filename);
934
819
continue;
935
820
}
936
821
937
plugin *p = getplugin(direntries[i]->d_name);
822
plugin *p = getplugin(dirst->d_name);
938
823
if(p == NULL){
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
824
perror("getplugin");
825
free(filename);
942
826
continue;
943
827
}
944
828
if(p->disabled){
945
829
if(debug){
946
830
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
947
direntries[i]->d_name);
831
dirst->d_name);
948
832
}
949
close(plugin_fd);
950
free(direntries[i]);
833
free(filename);
951
834
continue;
952
835
}
953
836
{
956
839
if(g != NULL){
957
840
for(char **a = g->argv + 1; *a != NULL; a++){
958
841
if(not add_argument(p, *a)){
959
error(0, errno, "add_argument");
842
perror("add_argument");
960
843
}
961
844
}
962
845
/* Add global environment variables */
963
846
for(char **e = g->environ; *e != NULL; e++){
964
847
if(not add_environment(p, *e, false)){
965
error(0, errno, "add_environment");
848
perror("add_environment");
966
849
}
967
850
}
968
851
}
969
852
}
970
/* If this plugin has any environment variables, we need to
971
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. */
972
856
if(p->environ[0] != NULL){
973
857
for(char **e = environ; *e != NULL; e++){
974
858
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
859
perror("add_environment");
976
860
}
977
861
}
978
862
}
979
863
980
864
int pipefd[2];
981
#ifndef O_CLOEXEC
982
865
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 */
986
866
if(ret == -1){
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
867
perror("pipe");
868
exitstatus = EXIT_FAILURE;
869
goto fallback;
870
}
1002
871
/* Ask OS to automatic close the pipe on exec */
1003
872
ret = set_cloexec_flag(pipefd[0]);
1004
873
if(ret < 0){
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
874
perror("set_cloexec_flag");
875
exitstatus = EXIT_FAILURE;
1010
876
goto fallback;
1011
877
}
1012
878
ret = set_cloexec_flag(pipefd[1]);
1013
879
if(ret < 0){
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
880
perror("set_cloexec_flag");
881
exitstatus = EXIT_FAILURE;
1019
882
goto fallback;
1020
883
}
1021
#endif /* not O_CLOEXEC */
1022
884
/* Block SIGCHLD until process is safely in process list */
1023
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
886
&sigchld_action.sa_mask,
1025
887
NULL));
1026
888
if(ret < 0){
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
889
perror("sigprocmask");
890
exitstatus = EXIT_FAILURE;
1030
891
goto fallback;
1031
892
}
1032
893
/* Starting a new process to be watched */
1035
896
pid = fork();
1036
897
} while(pid == -1 and errno == EINTR);
1037
898
if(pid == -1){
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]);
899
perror("fork");
900
exitstatus = EXIT_FAILURE;
1045
901
goto fallback;
1046
902
}
1047
903
if(pid == 0){
1048
904
/* this is the child process */
1049
905
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1050
906
if(ret < 0){
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
907
perror("sigaction");
908
_exit(EXIT_FAILURE);
1053
909
}
1054
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
911
if(ret < 0){
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
912
perror("sigprocmask");
913
_exit(EXIT_FAILURE);
1058
914
}
1059
915
1060
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1061
917
if(ret == -1){
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
918
perror("dup2");
919
_exit(EXIT_FAILURE);
1064
920
}
1065
921
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);
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
}
1072
937
}
1073
938
/* no return */
1074
939
}
1075
940
/* Parent process */
1076
close(pipefd[1]); /* Close unused write end of pipe */
1077
close(plugin_fd);
1078
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);
1079
945
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
946
perror("getplugin");
1081
947
ret = (int)(TEMP_FAILURE_RETRY
1082
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
949
NULL)));
1084
950
if(ret < 0){
1085
error(0, errno, "sigprocmask");
951
perror("sigprocmask");
1086
952
}
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
953
exitstatus = EXIT_FAILURE;
1089
954
goto fallback;
1090
955
}
1091
free(direntries[i]);
1092
956
1093
957
new_plugin->pid = pid;
1094
958
new_plugin->fd = pipefd[0];
1099
963
&sigchld_action.sa_mask,
1100
964
NULL));
1101
965
if(ret < 0){
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
966
perror("sigprocmask");
967
exitstatus = EXIT_FAILURE;
1104
968
goto fallback;
1105
969
}
1106
970
1107
FD_SET(new_plugin->fd, &rfds_all);
971
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
972
-Wconversion */
1108
973
1109
974
if(maxfd < new_plugin->fd){
1110
975
maxfd = new_plugin->fd;
1111
976
}
1112
977
}
1113
978
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
979
TEMP_FAILURE_RETRY(closedir(dir));
980
dir = NULL;
1118
981
free_plugin(getplugin(NULL));
1119
982
1120
983
for(plugin *p = plugin_list; p != NULL; p = p->next){
1133
996
fd_set rfds = rfds_all;
1134
997
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1135
998
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
999
perror("select");
1000
exitstatus = EXIT_FAILURE;
1138
1001
goto fallback;
1139
1002
}
1140
1003
/* OK, now either a process completed, or something can be read
1166
1029
}
1167
1030
1168
1031
/* Remove the plugin */
1169
FD_CLR(proc->fd, &rfds_all);
1032
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1033
-Wconversion */
1170
1034
1171
1035
/* Block signal while modifying process_list */
1172
1036
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1174
1038
&sigchld_action.sa_mask,
1175
1039
NULL));
1176
1040
if(ret < 0){
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
1041
perror("sigprocmask");
1042
exitstatus = EXIT_FAILURE;
1179
1043
goto fallback;
1180
1044
}
1181
1045
1188
1052
(sigprocmask(SIG_UNBLOCK,
1189
1053
&sigchld_action.sa_mask, NULL)));
1190
1054
if(ret < 0){
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
1055
perror("sigprocmask");
1056
exitstatus = EXIT_FAILURE;
1193
1057
goto fallback;
1194
1058
}
1195
1059
1205
1069
bool bret = print_out_password(proc->buffer,
1206
1070
proc->buffer_length);
1207
1071
if(not bret){
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
1072
perror("print_out_password");
1073
exitstatus = EXIT_FAILURE;
1210
1074
}
1211
1075
goto fallback;
1212
1076
}
1213
1077
1214
1078
/* This process has not completed. Does it have any output? */
1215
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1079
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1080
warning from
1081
-Wconversion */
1216
1082
/* This process had nothing to say at this time */
1217
1083
proc = proc->next;
1218
1084
continue;
1219
1085
}
1220
1086
/* Before reading, make the process' data buffer large enough */
1221
1087
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
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;
1227
1093
goto fallback;
1228
1094
}
1229
proc->buffer = new_buffer;
1230
1095
proc->buffer_size += BUFFER_SIZE;
1231
1096
}
1232
1097
/* Read from the process */
1251
1116
1252
1117
fallback:
1253
1118
1254
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1255
and exitstatus != EX_OK)){
1119
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1256
1120
/* Fallback if all plugins failed, none are found or an error
1257
1121
occured */
1258
1122
bool bret;
1266
1130
}
1267
1131
bret = print_out_password(passwordbuffer, len);
1268
1132
if(not bret){
1269
error(0, errno, "print_out_password");
1270
exitstatus = EX_IOERR;
1133
perror("print_out_password");
1134
exitstatus = EXIT_FAILURE;
1271
1135
}
1272
1136
}
1273
1137
1274
1138
/* Restore old signal handler */
1275
1139
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1276
1140
if(ret == -1){
1277
error(0, errno, "sigaction");
1278
exitstatus = EX_OSERR;
1141
perror("sigaction");
1142
exitstatus = EXIT_FAILURE;
1279
1143
}
1280
1144
1281
1145
if(custom_argv != NULL){
1285
1149
free(custom_argv);
1286
1150
}
1287
1151
1288
free(direntries);
1289
1290
if(dir_fd != -1){
1291
close(dir_fd);
1152
if(dir != NULL){
1153
closedir(dir);
1292
1154
}
1293
1155
1294
1156
/* Kill the processes */
1298
1160
ret = kill(p->pid, SIGTERM);
1299
1161
if(ret == -1 and errno != ESRCH){
1300
1162
/* Set-uid proccesses might not get closed */
1301
error(0, errno, "kill");
1163
perror("kill");
1302
1164
}
1303
1165
}
1304
1166
}
1308
1170
ret = wait(NULL);
1309
1171
} while(ret >= 0);
1310
1172
if(errno != ECHILD){
1311
error(0, errno, "wait");
1173
perror("wait");
1312
1174
}
1313
1175
1314
1176
free_plugin_list();
1315
1177
1316
1178
free(plugindir);
1317
free(pluginhelperdir);
1318
1179
free(argfile);
1319
1180
1320
1181
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0