To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.7.475
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.475
- Committer: Teddy Hogeborn
- Date: 2018-02-10 13:23:58 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 362.
- Revision ID: teddy@recompile.se-20180210132358-8pfvo9vshq9l32y5
Remove unnecessary text left from old example init.d file
* init.d-mandos: Remove unnecessary text left from old example init.d
file.
* init.d-mandos: Remove unnecessary text left from old example init.d
file.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- debian/mandos-client.config
- 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 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2(), STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
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
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
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() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
82
const char *argp_program_version = "plugin-runner " VERSION;
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
84
75
85
typedef struct plugin{
76
86
char *name; /* can be NULL or any plugin name */
79
89
char **environ;
80
90
int envc;
81
91
bool disabled;
82
92
83
93
/* Variables used for running processes*/
84
94
pid_t pid;
85
95
int fd;
87
97
size_t buffer_size;
88
98
size_t buffer_length;
89
99
bool eof;
90
volatile bool completed;
91
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
92
102
struct plugin *next;
93
103
} plugin;
94
104
96
106
97
107
/* Gets an existing plugin based on name,
98
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
99
110
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
102
if ((p->name == name)
103
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
104
115
return p;
105
116
}
106
117
}
107
118
/* Create a new plugin */
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
110
124
return NULL;
111
125
}
112
126
char *copy_name = NULL;
113
127
if(name != NULL){
114
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
115
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
116
135
return NULL;
117
136
}
118
137
}
119
138
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
124
143
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
127
149
free(copy_name);
128
150
free(new_plugin);
151
errno = e;
129
152
return NULL;
130
153
}
131
154
new_plugin->argv[0] = copy_name;
132
155
new_plugin->argv[1] = NULL;
133
156
134
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
135
160
if(new_plugin->environ == NULL){
161
int e = errno;
136
162
free(copy_name);
137
163
free(new_plugin->argv);
138
164
free(new_plugin);
165
errno = e;
139
166
return NULL;
140
167
}
141
168
new_plugin->environ[0] = NULL;
146
173
}
147
174
148
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
149
177
static bool add_to_char_array(const char *new, char ***array,
150
178
int *len){
151
179
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
154
185
/* Malloc check */
155
if(*array == NULL){
186
if(new_array == NULL){
156
187
return false;
157
188
}
189
*array = new_array;
158
190
/* Make a copy of the new string */
159
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
160
195
if(copy == NULL){
161
196
return false;
162
197
}
169
204
}
170
205
171
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
172
208
static bool add_argument(plugin *p, const char *arg){
173
209
if(p == NULL){
174
210
return false;
177
213
}
178
214
179
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
180
217
static bool add_environment(plugin *p, const char *def, bool replace){
181
218
if(p == NULL){
182
219
return false;
184
221
/* namelen = length of name of environment variable */
185
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
223
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
189
226
/* It already exists */
190
227
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
193
233
return false;
194
234
}
195
*e = new;
196
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
197
237
}
198
238
return true;
199
239
}
201
241
return add_to_char_array(def, &(p->environ), &(p->envc));
202
242
}
203
243
244
#ifndef O_CLOEXEC
204
245
/*
205
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
247
* Descriptor Flags".
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
249
*/
250
__attribute__((warn_unused_result))
209
251
static int set_cloexec_flag(int fd){
210
int ret = fcntl(fd, F_GETFD, 0);
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
253
/* If reading the flags failed, return error indication now. */
212
254
if(ret < 0){
213
255
return ret;
214
256
}
215
257
/* Store modified flag word in the descriptor. */
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
217
260
}
261
#endif /* not O_CLOEXEC */
218
262
219
263
220
264
/* Mark processes as completed when they exit, and save their exit
221
265
status. */
222
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
223
268
while(true){
224
269
plugin *proc = plugin_list;
225
270
int status;
229
274
break;
230
275
}
231
276
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
234
280
}
235
/* No child processes */
236
break;
281
error(0, errno, "waitpid");
237
282
}
238
283
239
284
/* A child exited, find it in process_list */
245
290
continue;
246
291
}
247
292
proc->status = status;
248
proc->completed = true;
293
proc->completed = 1;
249
294
}
295
errno = old_errno;
250
296
}
251
297
252
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
253
300
static bool print_out_password(const char *buffer, size_t length){
254
301
ssize_t ret;
255
302
for(size_t written = 0; written < length; written += (size_t)ret){
263
310
}
264
311
265
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
266
314
static void free_plugin(plugin *plugin_node){
267
315
316
free(plugin_node->name);
268
317
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
318
free(*arg);
270
319
}
274
323
}
275
324
free(plugin_node->environ);
276
325
free(plugin_node->buffer);
277
326
278
327
/* Removes the plugin from the singly-linked list */
279
328
if(plugin_node == plugin_list){
280
329
/* First one - simple */
300
349
301
350
int main(int argc, char *argv[]){
302
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
303
353
char *argfile = NULL;
304
354
FILE *conffp;
305
size_t d_name_len;
306
DIR *dir = NULL;
307
struct dirent *dirst;
355
struct dirent **direntries = NULL;
308
356
struct stat st;
309
357
fd_set rfds_all;
310
358
int ret, maxfd = 0;
359
ssize_t sret;
311
360
uid_t uid = 65534;
312
361
gid_t gid = 65534;
313
362
bool debug = false;
317
366
.sa_flags = SA_NOCLDSTOP };
318
367
char **custom_argv = NULL;
319
368
int custom_argc = 0;
369
int dir_fd = -1;
320
370
321
371
/* Establish a signal handler */
322
372
sigemptyset(&sigchld_action.sa_mask);
323
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
374
if(ret == -1){
325
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
327
377
goto fallback;
328
378
}
329
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
380
if(ret == -1){
331
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
333
383
goto fallback;
334
384
}
335
385
367
417
.doc = "Group ID the plugins will run as", .group = 3 },
368
418
{ .name = "debug", .key = 132,
369
419
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
370
433
{ .name = NULL }
371
434
};
372
435
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
376
442
case 'g': /* --global-options */
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
381
continue;
382
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
386
448
}
387
449
}
450
errno = 0;
388
451
}
389
452
break;
390
453
case 'G': /* --global-env */
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
396
456
}
397
457
break;
398
458
case 'o': /* --options-for */
399
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
402
break;
403
}
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
406
break;
407
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
416
}
417
}
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
477
}
478
}
479
errno = 0;
418
480
}
419
481
break;
420
482
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
483
{
425
484
char *envdef = strchr(arg, ':');
426
485
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
427
488
break;
428
489
}
429
490
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
491
envdef++;
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
432
499
}
433
500
}
434
501
break;
435
502
case 'd': /* --disable */
436
if (arg != NULL){
503
{
437
504
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
440
508
}
441
p->disabled = true;
442
509
}
443
510
break;
444
511
case 'e': /* --enable */
445
if (arg != NULL){
512
{
446
513
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
449
517
}
450
p->disabled = false;
451
518
}
452
519
break;
453
520
case 128: /* --plugin-dir */
454
521
free(plugindir);
455
522
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
523
if(plugindir != NULL){
524
errno = 0;
525
}
459
526
break;
460
527
case 129: /* --config-file */
461
528
/* This is already done by parse_opt_config_file() */
462
529
break;
463
530
case 130: /* --userid */
464
uid = (uid_t)strtol(arg, NULL, 10);
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
465
540
break;
466
541
case 131: /* --groupid */
467
gid = (gid_t)strtol(arg, NULL, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
468
551
break;
469
552
case 132: /* --debug */
470
553
debug = true;
471
554
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
case -3: /* --usage */
569
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
570
argp_state_help(state, state->out_stream,
571
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
case 'V': /* --version */
573
fprintf(state->out_stream, "%s\n", argp_program_version);
574
exit(EXIT_SUCCESS);
575
break;
576
/*
577
* When adding more options before this line, remember to also add a
578
* "case" to the "parse_opt_config_file" function below.
579
*/
472
580
case ARGP_KEY_ARG:
473
581
/* Cryptsetup always passes an argument, which is an empty
474
582
string if "none" was specified in /etc/crypttab. So if
475
583
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
584
if(arg[0] == '\0'){
585
break;
478
586
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
587
default:
483
588
return ARGP_ERR_UNKNOWN;
484
589
}
485
return 0;
590
return errno; /* Set to 0 at start */
486
591
}
487
592
488
593
/* This option parser is the same as parse_opt() above, except it
489
594
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
494
600
case 'g': /* --global-options */
495
601
case 'G': /* --global-env */
496
602
case 'o': /* --options-for */
502
608
case 129: /* --config-file */
503
609
free(argfile);
504
610
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
611
if(argfile != NULL){
612
errno = 0;
507
613
}
508
break;
614
break;
509
615
case 130: /* --userid */
510
616
case 131: /* --groupid */
511
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
512
622
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
623
break;
515
624
default:
516
625
return ARGP_ERR_UNKNOWN;
517
626
}
518
return 0;
627
return errno;
519
628
}
520
629
521
630
struct argp argp = { .options = options,
523
632
.args_doc = "",
524
633
.doc = "Mandos plugin runner -- Run plugins" };
525
634
526
/* Parse using the parse_opt_config_file in order to get the custom
635
/* Parse using parse_opt_config_file() in order to get the custom
527
636
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
530
fprintf(stderr, "Unknown error while parsing arguments\n");
531
exitstatus = EXIT_FAILURE;
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
639
NULL, NULL);
640
switch(ret){
641
case 0:
642
break;
643
case ENOMEM:
644
default:
645
errno = ret;
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
648
goto fallback;
649
case EINVAL:
650
exitstatus = EX_USAGE;
532
651
goto fallback;
533
652
}
534
653
536
655
argp.parser = parse_opt;
537
656
538
657
/* Open the configfile if available */
539
if (argfile == NULL){
658
if(argfile == NULL){
540
659
conffp = fopen(AFILE, "r");
541
660
} else {
542
661
conffp = fopen(argfile, "r");
543
}
662
}
544
663
if(conffp != NULL){
545
664
char *org_line = NULL;
546
665
char *p, *arg, *new_arg, *line;
547
666
size_t size = 0;
548
ssize_t sret;
549
667
const char whitespace_delims[] = " \r\t\f\v\n";
550
668
const char comment_delim[] = "#";
551
669
552
670
custom_argc = 1;
553
671
custom_argv = malloc(sizeof(char*) * 2);
554
672
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
557
675
goto fallback;
558
676
}
559
677
custom_argv[0] = argv[0];
560
678
custom_argv[1] = NULL;
561
679
562
680
/* for each line in the config file, strip whitespace and ignore
563
681
commented text */
564
682
while(true){
566
684
if(sret == -1){
567
685
break;
568
686
}
569
687
570
688
line = org_line;
571
689
arg = strsep(&line, comment_delim);
572
690
while((p = strsep(&arg, whitespace_delims)) != NULL){
575
693
}
576
694
new_arg = strdup(p);
577
695
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
580
698
free(org_line);
581
699
goto fallback;
582
700
}
583
701
584
702
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
592
715
}
593
716
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
717
custom_argv[custom_argc] = NULL;
595
718
}
596
719
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
597
728
free(org_line);
598
729
} else {
599
730
/* Check for harmful errors and go to fallback. Other errors might
600
731
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
604
735
goto fallback;
605
736
}
606
737
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
609
740
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
615
755
goto fallback;
616
756
}
617
757
}
618
758
619
759
/* Parse actual command line arguments, to let them override the
620
760
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
793
}
626
794
}
627
795
628
796
if(debug){
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
630
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
631
799
p->name ? p->name : "Global", p->argc - 1);
632
800
for(char **a = p->argv; *a != NULL; a++){
633
801
fprintf(stderr, "\tArg: %s\n", *a);
634
802
}
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
804
for(char **a = p->environ; *a != NULL; a++){
637
805
fprintf(stderr, "\t%s\n", *a);
638
806
}
639
807
}
640
808
}
641
809
642
/* Strip permissions down to nobody */
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
643
839
ret = setuid(uid);
644
if (ret == -1){
645
perror("setuid");
646
}
647
setgid(gid);
648
if (ret == -1){
649
perror("setgid");
650
}
651
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
658
if(dir == NULL){
659
perror("Could not open plugin dir");
660
exitstatus = EXIT_FAILURE;
661
goto fallback;
662
}
663
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
665
845
{
666
int dir_fd = dirfd(dir);
667
if(dir_fd >= 0){
668
ret = set_cloexec_flag(dir_fd);
669
if(ret < 0){
670
perror("set_cloexec_flag");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
673
890
}
674
891
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
675
902
}
676
903
677
904
FD_ZERO(&rfds_all);
678
905
679
906
/* Read and execute any executable in the plugin directory*/
680
while(true){
681
dirst = readdir(dir);
682
683
/* All directory entries have been processed */
684
if(dirst == NULL){
685
if (errno == EBADF){
686
perror("readdir");
687
exitstatus = EXIT_FAILURE;
688
goto fallback;
689
}
690
break;
691
}
692
693
d_name_len = strlen(dirst->d_name);
694
695
/* Ignore dotfiles, backup files and other junk */
696
{
697
bool bad_name = false;
698
699
const char const *bad_prefixes[] = { ".", "#", NULL };
700
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
702
".dpkg-old",
703
".dpkg-bak",
704
".dpkg-divert", NULL };
705
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
706
size_t pre_len = strlen(*pre);
707
if((d_name_len >= pre_len)
708
and strncmp((dirst->d_name), *pre, pre_len) == 0){
709
if(debug){
710
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
711
" with bad prefix %s\n", dirst->d_name, *pre);
712
}
713
bad_name = true;
714
break;
715
}
716
}
717
if(bad_name){
718
continue;
719
}
720
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
721
size_t suf_len = strlen(*suf);
722
if((d_name_len >= suf_len)
723
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
724
== 0)){
725
if(debug){
726
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
727
" with bad suffix %s\n", dirst->d_name, *suf);
728
}
729
bad_name = true;
730
break;
731
}
732
}
733
734
if(bad_name){
735
continue;
736
}
737
}
738
739
char *filename;
740
if(plugindir == NULL){
741
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
742
} else {
743
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
}
745
if(ret < 0){
746
perror("asprintf");
747
continue;
748
}
749
750
ret = stat(filename, &st);
751
if (ret == -1){
752
perror("stat");
753
free(filename);
754
continue;
755
}
756
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
913
continue;
914
}
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
if(ret == -1){
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
920
continue;
921
}
922
757
923
/* Ignore non-executable files */
758
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
759
927
if(debug){
760
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
761
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
762
932
}
763
free(filename);
933
close(plugin_fd);
934
free(direntries[i]);
764
935
continue;
765
936
}
766
937
767
plugin *p = getplugin(dirst->d_name);
938
plugin *p = getplugin(direntries[i]->d_name);
768
939
if(p == NULL){
769
perror("getplugin");
770
free(filename);
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
771
943
continue;
772
944
}
773
945
if(p->disabled){
774
946
if(debug){
775
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
776
dirst->d_name);
948
direntries[i]->d_name);
777
949
}
778
free(filename);
950
close(plugin_fd);
951
free(direntries[i]);
779
952
continue;
780
953
}
781
954
{
784
957
if(g != NULL){
785
958
for(char **a = g->argv + 1; *a != NULL; a++){
786
959
if(not add_argument(p, *a)){
787
perror("add_argument");
960
error(0, errno, "add_argument");
788
961
}
789
962
}
790
963
/* Add global environment variables */
791
964
for(char **e = g->environ; *e != NULL; e++){
792
965
if(not add_environment(p, *e, false)){
793
perror("add_environment");
966
error(0, errno, "add_environment");
794
967
}
795
968
}
796
969
}
797
970
}
798
/* If this plugin has any environment variables, we will call
799
using execve and need to duplicate the environment from this
800
process, too. */
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
801
973
if(p->environ[0] != NULL){
802
974
for(char **e = environ; *e != NULL; e++){
803
975
if(not add_environment(p, *e, false)){
804
perror("add_environment");
976
error(0, errno, "add_environment");
805
977
}
806
978
}
807
979
}
808
980
809
981
int pipefd[2];
810
ret = pipe(pipefd);
811
if (ret == -1){
812
perror("pipe");
813
exitstatus = EXIT_FAILURE;
814
goto fallback;
815
}
982
#ifndef O_CLOEXEC
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
987
if(ret == -1){
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
816
1003
/* Ask OS to automatic close the pipe on exec */
817
1004
ret = set_cloexec_flag(pipefd[0]);
818
1005
if(ret < 0){
819
perror("set_cloexec_flag");
820
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
821
1011
goto fallback;
822
1012
}
823
1013
ret = set_cloexec_flag(pipefd[1]);
824
1014
if(ret < 0){
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
827
1020
goto fallback;
828
1021
}
1022
#endif /* not O_CLOEXEC */
829
1023
/* Block SIGCHLD until process is safely in process list */
830
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1026
NULL));
831
1027
if(ret < 0){
832
perror("sigprocmask");
833
exitstatus = EXIT_FAILURE;
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
834
1031
goto fallback;
835
1032
}
836
1033
/* Starting a new process to be watched */
837
pid_t pid = fork();
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
838
1038
if(pid == -1){
839
perror("fork");
840
exitstatus = EXIT_FAILURE;
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
841
1046
goto fallback;
842
1047
}
843
1048
if(pid == 0){
844
1049
/* this is the child process */
845
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
846
1051
if(ret < 0){
847
perror("sigaction");
848
_exit(EXIT_FAILURE);
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
849
1054
}
850
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
1056
if(ret < 0){
852
perror("sigprocmask");
853
_exit(EXIT_FAILURE);
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
854
1059
}
855
1060
856
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
857
1062
if(ret == -1){
858
perror("dup2");
859
_exit(EXIT_FAILURE);
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
860
1065
}
861
1066
862
if(dirfd(dir) < 0){
863
/* If dir has no file descriptor, we could not set FD_CLOEXEC
864
above and must now close it manually here. */
865
closedir(dir);
866
}
867
if(p->environ[0] == NULL){
868
if(execv(filename, p->argv) < 0){
869
perror("execv");
870
_exit(EXIT_FAILURE);
871
}
872
} else {
873
if(execve(filename, p->argv, p->environ) < 0){
874
perror("execve");
875
_exit(EXIT_FAILURE);
876
}
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
877
1073
}
878
1074
/* no return */
879
1075
}
880
1076
/* Parent process */
881
1077
close(pipefd[1]); /* Close unused write end of pipe */
882
free(filename);
883
plugin *new_plugin = getplugin(dirst->d_name);
884
if (new_plugin == NULL){
885
perror("getplugin");
886
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1084
NULL)));
887
1085
if(ret < 0){
888
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
889
1087
}
890
exitstatus = EXIT_FAILURE;
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
891
1090
goto fallback;
892
1091
}
1092
free(direntries[i]);
893
1093
894
1094
new_plugin->pid = pid;
895
1095
new_plugin->fd = pipefd[0];
896
1096
897
1097
/* Unblock SIGCHLD so signal handler can be run if this process
898
1098
has already completed */
899
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
1101
NULL));
900
1102
if(ret < 0){
901
perror("sigprocmask");
902
exitstatus = EXIT_FAILURE;
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
903
1105
goto fallback;
904
1106
}
905
1107
906
1108
FD_SET(new_plugin->fd, &rfds_all);
907
1109
908
if (maxfd < new_plugin->fd){
1110
if(maxfd < new_plugin->fd){
909
1111
maxfd = new_plugin->fd;
910
1112
}
911
1113
}
912
1114
913
closedir(dir);
914
dir = NULL;
1115
free(direntries);
1116
direntries = NULL;
1117
close(dir_fd);
1118
dir_fd = -1;
1119
free_plugin(getplugin(NULL));
915
1120
916
1121
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
1122
if(p->pid != 0){
928
1133
while(plugin_list){
929
1134
fd_set rfds = rfds_all;
930
1135
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
if (select_ret == -1){
932
perror("select");
933
exitstatus = EXIT_FAILURE;
1136
if(select_ret == -1 and errno != EINTR){
1137
error(0, errno, "select");
1138
exitstatus = EX_OSERR;
934
1139
goto fallback;
935
1140
}
936
1141
/* OK, now either a process completed, or something can be read
937
1142
from one of them */
938
1143
for(plugin *proc = plugin_list; proc != NULL;){
939
1144
/* Is this process completely done? */
940
if(proc->eof and proc->completed){
1145
if(proc->completed and proc->eof){
941
1146
/* Only accept the plugin output if it exited cleanly */
942
1147
if(not WIFEXITED(proc->status)
943
1148
or WEXITSTATUS(proc->status) != 0){
944
1149
/* Bad exit by plugin */
945
1150
946
1151
if(debug){
947
1152
if(WIFEXITED(proc->status)){
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
950
1156
WEXITSTATUS(proc->status));
951
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
954
WTERMSIG(proc->status));
955
} else if(WCOREDUMP(proc->status)){
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
1157
} else if(WIFSIGNALED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1159
" signal %d: %s\n", proc->name,
1160
(intmax_t) (proc->pid),
1161
WTERMSIG(proc->status),
1162
strsignal(WTERMSIG(proc->status)));
958
1163
}
959
1164
}
960
1165
961
1166
/* Remove the plugin */
962
1167
FD_CLR(proc->fd, &rfds_all);
963
1168
964
1169
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1171
(SIG_BLOCK,
1172
&sigchld_action.sa_mask,
1173
NULL));
966
1174
if(ret < 0){
967
perror("sigprocmask");
968
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
969
1177
goto fallback;
970
1178
}
971
1179
974
1182
proc = next_plugin;
975
1183
976
1184
/* We are done modifying process list, so unblock signal */
977
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
978
NULL);
1185
ret = (int)(TEMP_FAILURE_RETRY
1186
(sigprocmask(SIG_UNBLOCK,
1187
&sigchld_action.sa_mask, NULL)));
979
1188
if(ret < 0){
980
perror("sigprocmask");
981
exitstatus = EXIT_FAILURE;
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
982
1191
goto fallback;
983
1192
}
984
1193
994
1203
bool bret = print_out_password(proc->buffer,
995
1204
proc->buffer_length);
996
1205
if(not bret){
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
999
1208
}
1000
1209
goto fallback;
1001
1210
}
1008
1217
}
1009
1218
/* Before reading, make the process' data buffer large enough */
1010
1219
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1011
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1014
perror("malloc");
1015
exitstatus = EXIT_FAILURE;
1220
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1221
+ (size_t) BUFFER_SIZE);
1222
if(new_buffer == NULL){
1223
error(0, errno, "malloc");
1224
exitstatus = EX_OSERR;
1016
1225
goto fallback;
1017
1226
}
1227
proc->buffer = new_buffer;
1018
1228
proc->buffer_size += BUFFER_SIZE;
1019
1229
}
1020
1230
/* Read from the process */
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1232
proc->buffer
1233
+ proc->buffer_length,
1234
BUFFER_SIZE));
1235
if(sret < 0){
1024
1236
/* Read error from this process; ignore the error */
1025
1237
proc = proc->next;
1026
1238
continue;
1027
1239
}
1028
if(ret == 0){
1240
if(sret == 0){
1029
1241
/* got EOF */
1030
1242
proc->eof = true;
1031
1243
} else {
1032
proc->buffer_length += (size_t) ret;
1244
proc->buffer_length += (size_t) sret;
1033
1245
}
1034
1246
}
1035
1247
}
1036
1037
1248
1249
1038
1250
fallback:
1039
1251
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
1041
1254
/* Fallback if all plugins failed, none are found or an error
1042
1255
occured */
1043
1256
bool bret;
1051
1264
}
1052
1265
bret = print_out_password(passwordbuffer, len);
1053
1266
if(not bret){
1054
perror("print_out_password");
1055
exitstatus = EXIT_FAILURE;
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
1056
1269
}
1057
1270
}
1058
1271
1059
1272
/* Restore old signal handler */
1060
1273
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
1274
if(ret == -1){
1062
perror("sigaction");
1063
exitstatus = EXIT_FAILURE;
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
1064
1277
}
1065
1278
1066
1279
if(custom_argv != NULL){
1070
1283
free(custom_argv);
1071
1284
}
1072
1285
1073
if(dir != NULL){
1074
closedir(dir);
1286
free(direntries);
1287
1288
if(dir_fd != -1){
1289
close(dir_fd);
1075
1290
}
1076
1291
1077
1292
/* Kill the processes */
1081
1296
ret = kill(p->pid, SIGTERM);
1082
1297
if(ret == -1 and errno != ESRCH){
1083
1298
/* Set-uid proccesses might not get closed */
1084
perror("kill");
1299
error(0, errno, "kill");
1085
1300
}
1086
1301
}
1087
1302
}
1088
1303
1089
1304
/* Wait for any remaining child processes to terminate */
1090
do{
1305
do {
1091
1306
ret = wait(NULL);
1092
1307
} while(ret >= 0);
1093
1308
if(errno != ECHILD){
1094
perror("wait");
1309
error(0, errno, "wait");
1095
1310
}
1096
1311
1097
1312
free_plugin_list();
1098
1313
1099
1314
free(plugindir);
1315
free(pluginhelperdir);
1100
1316
free(argfile);
1101
1317
1102
1318
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0