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- Committer: Teddy Hogeborn
- Date: 2017-08-20 14:14:14 UTC
- Revision ID: teddy@recompile.se-20170820141414-m034xuebg7ccaeui
Add some more restrictions to the systemd service file.
* mandos.service ([Service]/ProtectKernelTunables): New; set to "yes".
([Service]/ProtectControlGroups): - '' -
* mandos.service ([Service]/ProtectKernelTunables): New; set to "yes".
([Service]/ProtectControlGroups): - '' -
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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 © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 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
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
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
*/
53
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
62
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
63
sigaddset(), sigaction(),
64
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
66
67
#include <errno.h> /* errno, EBADF */
68
#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() */
67
74
68
75
#define BUFFER_SIZE 256
69
76
70
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
71
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
80
73
81
const char *argp_program_version = "plugin-runner " VERSION;
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
83
76
84
typedef struct plugin{
77
85
char *name; /* can be NULL or any plugin name */
80
88
char **environ;
81
89
int envc;
82
90
bool disabled;
83
91
84
92
/* Variables used for running processes*/
85
93
pid_t pid;
86
94
int fd;
88
96
size_t buffer_size;
89
97
size_t buffer_length;
90
98
bool eof;
91
volatile bool completed;
92
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
93
101
struct plugin *next;
94
102
} plugin;
95
103
97
105
98
106
/* Gets an existing plugin based on name,
99
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
100
109
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
105
114
return p;
106
115
}
107
116
}
108
117
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
111
123
return NULL;
112
124
}
113
125
char *copy_name = NULL;
114
126
if(name != NULL){
115
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
116
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
117
134
return NULL;
118
135
}
119
136
}
120
137
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
125
142
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
128
148
free(copy_name);
129
149
free(new_plugin);
150
errno = e;
130
151
return NULL;
131
152
}
132
153
new_plugin->argv[0] = copy_name;
133
154
new_plugin->argv[1] = NULL;
134
155
135
new_plugin->environ = malloc(sizeof(char *));
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
136
159
if(new_plugin->environ == NULL){
160
int e = errno;
137
161
free(copy_name);
138
162
free(new_plugin->argv);
139
163
free(new_plugin);
164
errno = e;
140
165
return NULL;
141
166
}
142
167
new_plugin->environ[0] = NULL;
147
172
}
148
173
149
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
150
176
static bool add_to_char_array(const char *new, char ***array,
151
177
int *len){
152
178
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
155
184
/* Malloc check */
156
if(*array == NULL){
185
if(new_array == NULL){
157
186
return false;
158
187
}
188
*array = new_array;
159
189
/* Make a copy of the new string */
160
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
161
194
if(copy == NULL){
162
195
return false;
163
196
}
170
203
}
171
204
172
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
173
207
static bool add_argument(plugin *p, const char *arg){
174
208
if(p == NULL){
175
209
return false;
178
212
}
179
213
180
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
181
216
static bool add_environment(plugin *p, const char *def, bool replace){
182
217
if(p == NULL){
183
218
return false;
185
220
/* namelen = length of name of environment variable */
186
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
222
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
190
225
/* It already exists */
191
226
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
194
232
return false;
195
233
}
196
*e = new;
197
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
198
236
}
199
237
return true;
200
238
}
202
240
return add_to_char_array(def, &(p->environ), &(p->envc));
203
241
}
204
242
243
#ifndef O_CLOEXEC
205
244
/*
206
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
246
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
248
*/
249
__attribute__((warn_unused_result))
210
250
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
252
/* If reading the flags failed, return error indication now. */
213
253
if(ret < 0){
214
254
return ret;
215
255
}
216
256
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
218
259
}
260
#endif /* not O_CLOEXEC */
219
261
220
262
221
263
/* Mark processes as completed when they exit, and save their exit
222
264
status. */
223
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
224
267
while(true){
225
268
plugin *proc = plugin_list;
226
269
int status;
230
273
break;
231
274
}
232
275
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
235
279
}
236
/* No child processes */
237
break;
280
error(0, errno, "waitpid");
238
281
}
239
282
240
283
/* A child exited, find it in process_list */
246
289
continue;
247
290
}
248
291
proc->status = status;
249
proc->completed = true;
292
proc->completed = 1;
250
293
}
294
errno = old_errno;
251
295
}
252
296
253
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
254
299
static bool print_out_password(const char *buffer, size_t length){
255
300
ssize_t ret;
256
301
for(size_t written = 0; written < length; written += (size_t)ret){
264
309
}
265
310
266
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
267
313
static void free_plugin(plugin *plugin_node){
268
314
269
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
321
}
276
322
free(plugin_node->environ);
277
323
free(plugin_node->buffer);
278
324
279
325
/* Removes the plugin from the singly-linked list */
280
326
if(plugin_node == plugin_list){
281
327
/* First one - simple */
301
347
302
348
int main(int argc, char *argv[]){
303
349
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
304
351
char *argfile = NULL;
305
352
FILE *conffp;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
353
struct dirent **direntries = NULL;
309
354
struct stat st;
310
355
fd_set rfds_all;
311
356
int ret, maxfd = 0;
319
364
.sa_flags = SA_NOCLDSTOP };
320
365
char **custom_argv = NULL;
321
366
int custom_argc = 0;
367
int dir_fd = -1;
322
368
323
369
/* Establish a signal handler */
324
370
sigemptyset(&sigchld_action.sa_mask);
325
371
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
372
if(ret == -1){
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
329
375
goto fallback;
330
376
}
331
377
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
378
if(ret == -1){
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
335
381
goto fallback;
336
382
}
337
383
369
415
.doc = "Group ID the plugins will run as", .group = 3 },
370
416
{ .name = "debug", .key = 132,
371
417
.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 },
372
431
{ .name = NULL }
373
432
};
374
433
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
errno = 0;
437
switch(key){
438
char *tmp;
439
intmax_t tmp_id;
378
440
case 'g': /* --global-options */
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
441
{
442
char *plugin_option;
443
while((plugin_option = strsep(&arg, ",")) != NULL){
444
if(not add_argument(getplugin(NULL), plugin_option)){
445
break;
388
446
}
389
447
}
448
errno = 0;
390
449
}
391
450
break;
392
451
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
398
454
}
399
455
break;
400
456
case 'o': /* --options-for */
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
418
}
419
}
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;
475
}
476
}
477
errno = 0;
420
478
}
421
479
break;
422
480
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
481
{
427
482
char *envdef = strchr(arg, ':');
428
483
if(envdef == NULL){
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
429
486
break;
430
487
}
431
488
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
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;
434
497
}
435
498
}
436
499
break;
437
500
case 'd': /* --disable */
438
if (arg != NULL){
501
{
439
502
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
442
506
}
443
p->disabled = true;
444
507
}
445
508
break;
446
509
case 'e': /* --enable */
447
if (arg != NULL){
510
{
448
511
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
451
515
}
452
p->disabled = false;
453
516
}
454
517
break;
455
518
case 128: /* --plugin-dir */
456
519
free(plugindir);
457
520
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
521
if(plugindir != NULL){
522
errno = 0;
523
}
461
524
break;
462
525
case 129: /* --config-file */
463
526
/* This is already done by parse_opt_config_file() */
464
527
break;
465
528
case 130: /* --userid */
466
uid = (uid_t)strtol(arg, NULL, 10);
529
tmp_id = strtoimax(arg, &tmp, 10);
530
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;
535
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
467
538
break;
468
539
case 131: /* --groupid */
469
gid = (gid_t)strtol(arg, NULL, 10);
540
tmp_id = strtoimax(arg, &tmp, 10);
541
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;
546
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
470
549
break;
471
550
case 132: /* --debug */
472
551
debug = true;
473
552
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
/*
575
* When adding more options before this line, remember to also add a
576
* "case" to the "parse_opt_config_file" function below.
577
*/
474
578
case ARGP_KEY_ARG:
475
579
/* Cryptsetup always passes an argument, which is an empty
476
580
string if "none" was specified in /etc/crypttab. So if
477
581
argument was empty, we ignore it silently. */
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
582
if(arg[0] == '\0'){
583
break;
480
584
}
481
break;
482
case ARGP_KEY_END:
483
break;
484
585
default:
485
586
return ARGP_ERR_UNKNOWN;
486
587
}
487
return 0;
588
return errno; /* Set to 0 at start */
488
589
}
489
590
490
591
/* This option parser is the same as parse_opt() above, except it
491
592
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
593
error_t parse_opt_config_file(int key, char *arg,
594
__attribute__((unused))
595
struct argp_state *state){
596
errno = 0;
597
switch(key){
496
598
case 'g': /* --global-options */
497
599
case 'G': /* --global-env */
498
600
case 'o': /* --options-for */
504
606
case 129: /* --config-file */
505
607
free(argfile);
506
608
argfile = strdup(arg);
507
if(argfile == NULL){
508
perror("strdup");
609
if(argfile != NULL){
610
errno = 0;
509
611
}
510
break;
612
break;
511
613
case 130: /* --userid */
512
614
case 131: /* --groupid */
513
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
514
620
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
516
621
break;
517
622
default:
518
623
return ARGP_ERR_UNKNOWN;
519
624
}
520
return 0;
625
return errno;
521
626
}
522
627
523
628
struct argp argp = { .options = options,
525
630
.args_doc = "",
526
631
.doc = "Mandos plugin runner -- Run plugins" };
527
632
528
/* Parse using the parse_opt_config_file in order to get the custom
633
/* Parse using parse_opt_config_file() in order to get the custom
529
634
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
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;
534
649
goto fallback;
535
650
}
536
651
538
653
argp.parser = parse_opt;
539
654
540
655
/* Open the configfile if available */
541
if (argfile == NULL){
656
if(argfile == NULL){
542
657
conffp = fopen(AFILE, "r");
543
658
} else {
544
659
conffp = fopen(argfile, "r");
545
}
660
}
546
661
if(conffp != NULL){
547
662
char *org_line = NULL;
548
663
char *p, *arg, *new_arg, *line;
549
664
size_t size = 0;
550
665
const char whitespace_delims[] = " \r\t\f\v\n";
551
666
const char comment_delim[] = "#";
552
667
553
668
custom_argc = 1;
554
669
custom_argv = malloc(sizeof(char*) * 2);
555
670
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
558
673
goto fallback;
559
674
}
560
675
custom_argv[0] = argv[0];
561
676
custom_argv[1] = NULL;
562
677
563
678
/* for each line in the config file, strip whitespace and ignore
564
679
commented text */
565
680
while(true){
567
682
if(sret == -1){
568
683
break;
569
684
}
570
685
571
686
line = org_line;
572
687
arg = strsep(&line, comment_delim);
573
688
while((p = strsep(&arg, whitespace_delims)) != NULL){
576
691
}
577
692
new_arg = strdup(p);
578
693
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
581
696
free(org_line);
582
697
goto fallback;
583
698
}
584
699
585
700
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
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
}
593
713
}
594
714
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
715
custom_argv[custom_argc] = NULL;
596
716
}
597
717
}
718
do {
719
ret = fclose(conffp);
720
} while(ret == EOF and errno == EINTR);
721
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
724
goto fallback;
725
}
598
726
free(org_line);
599
727
} else {
600
728
/* Check for harmful errors and go to fallback. Other errors might
601
729
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
605
733
goto fallback;
606
734
}
607
735
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
610
738
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
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;
616
753
goto fallback;
617
754
}
618
755
}
619
756
620
757
/* Parse actual command line arguments, to let them override the
621
758
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
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
}
627
792
}
628
793
629
794
if(debug){
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
795
for(plugin *p = plugin_list; p != NULL; p = p->next){
631
796
fprintf(stderr, "Plugin: %s has %d arguments\n",
632
797
p->name ? p->name : "Global", p->argc - 1);
633
798
for(char **a = p->argv; *a != NULL; a++){
634
799
fprintf(stderr, "\tArg: %s\n", *a);
635
800
}
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
801
fprintf(stderr, "...and %d environment variables\n", p->envc);
637
802
for(char **a = p->environ; *a != NULL; a++){
638
803
fprintf(stderr, "\t%s\n", *a);
639
804
}
640
805
}
641
806
}
642
807
643
/* Strip permissions down to nobody */
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);
834
if(ret == -1){
835
error(0, errno, "setgid");
836
}
644
837
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
838
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
666
843
{
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
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;
674
888
}
675
889
}
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;
676
900
}
677
901
678
902
FD_ZERO(&rfds_all);
679
903
680
904
/* Read and execute any executable in the plugin directory*/
681
while(true){
682
dirst = readdir(dir);
683
684
/* All directory entries have been processed */
685
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
691
break;
692
}
693
694
d_name_len = strlen(dirst->d_name);
695
696
/* Ignore dotfiles, backup files and other junk */
697
{
698
bool bad_name = false;
699
700
const char const *bad_prefixes[] = { ".", "#", NULL };
701
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-old",
704
".dpkg-bak",
705
".dpkg-divert", NULL };
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
size_t pre_len = strlen(*pre);
708
if((d_name_len >= pre_len)
709
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
if(debug){
711
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
712
" with bad prefix %s\n", dirst->d_name, *pre);
713
}
714
bad_name = true;
715
break;
716
}
717
}
718
if(bad_name){
719
continue;
720
}
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
size_t suf_len = strlen(*suf);
723
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
== 0)){
726
if(debug){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad suffix %s\n", dirst->d_name, *suf);
729
}
730
bad_name = true;
731
break;
732
}
733
}
734
735
if(bad_name){
736
continue;
737
}
738
}
739
740
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
746
if(ret < 0){
747
perror("asprintf");
748
continue;
749
}
750
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
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]);
911
continue;
912
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
914
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
918
continue;
919
}
920
758
921
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
922
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
760
925
if(debug){
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
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);
763
930
}
764
free(filename);
931
close(plugin_fd);
932
free(direntries[i]);
765
933
continue;
766
934
}
767
935
768
plugin *p = getplugin(dirst->d_name);
936
plugin *p = getplugin(direntries[i]->d_name);
769
937
if(p == NULL){
770
perror("getplugin");
771
free(filename);
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
772
941
continue;
773
942
}
774
943
if(p->disabled){
775
944
if(debug){
776
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
dirst->d_name);
946
direntries[i]->d_name);
778
947
}
779
free(filename);
948
close(plugin_fd);
949
free(direntries[i]);
780
950
continue;
781
951
}
782
952
{
785
955
if(g != NULL){
786
956
for(char **a = g->argv + 1; *a != NULL; a++){
787
957
if(not add_argument(p, *a)){
788
perror("add_argument");
958
error(0, errno, "add_argument");
789
959
}
790
960
}
791
961
/* Add global environment variables */
792
962
for(char **e = g->environ; *e != NULL; e++){
793
963
if(not add_environment(p, *e, false)){
794
perror("add_environment");
964
error(0, errno, "add_environment");
795
965
}
796
966
}
797
967
}
798
968
}
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
802
971
if(p->environ[0] != NULL){
803
972
for(char **e = environ; *e != NULL; e++){
804
973
if(not add_environment(p, *e, false)){
805
perror("add_environment");
974
error(0, errno, "add_environment");
806
975
}
807
976
}
808
977
}
809
978
810
979
int pipefd[2];
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
980
#ifndef O_CLOEXEC
981
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
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
817
1001
/* Ask OS to automatic close the pipe on exec */
818
1002
ret = set_cloexec_flag(pipefd[0]);
819
1003
if(ret < 0){
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
822
1009
goto fallback;
823
1010
}
824
1011
ret = set_cloexec_flag(pipefd[1]);
825
1012
if(ret < 0){
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
828
1018
goto fallback;
829
1019
}
1020
#endif /* not O_CLOEXEC */
830
1021
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
&sigchld_action.sa_mask,
1024
NULL));
832
1025
if(ret < 0){
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
835
1029
goto fallback;
836
1030
}
837
1031
/* Starting a new process to be watched */
838
pid_t pid = fork();
1032
pid_t pid;
1033
do {
1034
pid = fork();
1035
} while(pid == -1 and errno == EINTR);
839
1036
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
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]);
842
1044
goto fallback;
843
1045
}
844
1046
if(pid == 0){
845
1047
/* this is the child process */
846
1048
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
847
1049
if(ret < 0){
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
850
1052
}
851
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
1054
if(ret < 0){
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
855
1057
}
856
1058
857
1059
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
1060
if(ret == -1){
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
861
1063
}
862
1064
863
if(dirfd(dir) < 0){
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
866
closedir(dir);
867
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
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);
878
1071
}
879
1072
/* no return */
880
1073
}
881
1074
/* Parent process */
882
1075
close(pipefd[1]); /* Close unused write end of pipe */
883
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1078
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1080
ret = (int)(TEMP_FAILURE_RETRY
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
NULL)));
888
1083
if(ret < 0){
889
perror("sigprocmask");
1084
error(0, errno, "sigprocmask");
890
1085
}
891
exitstatus = EXIT_FAILURE;
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
892
1088
goto fallback;
893
1089
}
1090
free(direntries[i]);
894
1091
895
1092
new_plugin->pid = pid;
896
1093
new_plugin->fd = pipefd[0];
897
1094
898
1095
/* Unblock SIGCHLD so signal handler can be run if this process
899
1096
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
1099
NULL));
901
1100
if(ret < 0){
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
904
1103
goto fallback;
905
1104
}
906
1105
907
1106
FD_SET(new_plugin->fd, &rfds_all);
908
1107
909
if (maxfd < new_plugin->fd){
1108
if(maxfd < new_plugin->fd){
910
1109
maxfd = new_plugin->fd;
911
1110
}
912
1111
}
913
1112
914
closedir(dir);
915
dir = NULL;
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1117
free_plugin(getplugin(NULL));
916
1118
917
1119
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
1120
if(p->pid != 0){
929
1131
while(plugin_list){
930
1132
fd_set rfds = rfds_all;
931
1133
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
935
1137
goto fallback;
936
1138
}
937
1139
/* OK, now either a process completed, or something can be read
938
1140
from one of them */
939
1141
for(plugin *proc = plugin_list; proc != NULL;){
940
1142
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
1143
if(proc->completed and proc->eof){
942
1144
/* Only accept the plugin output if it exited cleanly */
943
1145
if(not WIFEXITED(proc->status)
944
1146
or WEXITSTATUS(proc->status) != 0){
945
1147
/* Bad exit by plugin */
946
1148
947
1149
if(debug){
948
1150
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
951
1154
WEXITSTATUS(proc->status));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
956
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1155
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(proc->status)));
959
1161
}
960
1162
}
961
1163
962
1164
/* Remove the plugin */
963
1165
FD_CLR(proc->fd, &rfds_all);
964
1166
965
1167
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
967
1172
if(ret < 0){
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
970
1175
goto fallback;
971
1176
}
972
1177
975
1180
proc = next_plugin;
976
1181
977
1182
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
980
1186
if(ret < 0){
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
983
1189
goto fallback;
984
1190
}
985
1191
995
1201
bool bret = print_out_password(proc->buffer,
996
1202
proc->buffer_length);
997
1203
if(not bret){
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
1000
1206
}
1001
1207
goto fallback;
1002
1208
}
1009
1215
}
1010
1216
/* Before reading, make the process' data buffer large enough */
1011
1217
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
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;
1017
1223
goto fallback;
1018
1224
}
1225
proc->buffer = new_buffer;
1019
1226
proc->buffer_size += BUFFER_SIZE;
1020
1227
}
1021
1228
/* Read from the process */
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1230
proc->buffer
1231
+ proc->buffer_length,
1232
BUFFER_SIZE));
1024
1233
if(sret < 0){
1025
1234
/* Read error from this process; ignore the error */
1026
1235
proc = proc->next;
1034
1243
}
1035
1244
}
1036
1245
}
1037
1038
1246
1247
1039
1248
fallback:
1040
1249
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1042
1252
/* Fallback if all plugins failed, none are found or an error
1043
1253
occured */
1044
1254
bool bret;
1052
1262
}
1053
1263
bret = print_out_password(passwordbuffer, len);
1054
1264
if(not bret){
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
1057
1267
}
1058
1268
}
1059
1269
1060
1270
/* Restore old signal handler */
1061
1271
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
1272
if(ret == -1){
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1065
1275
}
1066
1276
1067
1277
if(custom_argv != NULL){
1071
1281
free(custom_argv);
1072
1282
}
1073
1283
1074
if(dir != NULL){
1075
closedir(dir);
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1076
1288
}
1077
1289
1078
1290
/* Kill the processes */
1082
1294
ret = kill(p->pid, SIGTERM);
1083
1295
if(ret == -1 and errno != ESRCH){
1084
1296
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1297
error(0, errno, "kill");
1086
1298
}
1087
1299
}
1088
1300
}
1089
1301
1090
1302
/* Wait for any remaining child processes to terminate */
1091
do{
1303
do {
1092
1304
ret = wait(NULL);
1093
1305
} while(ret >= 0);
1094
1306
if(errno != ECHILD){
1095
perror("wait");
1307
error(0, errno, "wait");
1096
1308
}
1097
1309
1098
1310
free_plugin_list();
1099
1311
1100
1312
free(plugindir);
1313
free(pluginhelperdir);
1101
1314
free(argfile);
1102
1315
1103
1316
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0