To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 200
- compare with another revision
- download diff
- download tarball
- view history from revision 200
- Committer: Teddy Hogeborn
- Date: 2008-09-21 12:04:02 UTC
- Revision ID: teddy@fukt.bsnet.se-20080921120402-mgd2jl8xo634jw18
* Makefile: Put the init script before avahi-daemon.
* debian/mandos.prerm: Bug fix: stop mandos, not ssh.
* debian/rules (install-indep): Put the init script before
avahi-daemon.
* init.d/mandos: Require "avahi-daemon".
* debian/mandos.prerm: Bug fix: stop mandos, not ssh.
* debian/rules (install-indep): Put the init script before
avahi-daemon.
* init.d/mandos: Require "avahi-daemon".
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
5
* Copyright © 2007-2008 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
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
25
asprintf() */
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
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() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), 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() */
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(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#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
*/
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() */
52
52
#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() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#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() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
71
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
74
85
75
typedef struct plugin{
86
76
char *name; /* can be NULL or any plugin name */
89
79
char **environ;
90
80
int envc;
91
81
bool disabled;
92
82
93
83
/* Variables used for running processes*/
94
84
pid_t pid;
95
85
int fd;
97
87
size_t buffer_size;
98
88
size_t buffer_length;
99
89
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
90
volatile bool completed;
91
volatile int status;
102
92
struct plugin *next;
103
93
} plugin;
104
94
106
96
107
97
/* Gets an existing plugin based on name,
108
98
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
99
static plugin *getplugin(char *name){
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))){
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))){
115
104
return p;
116
105
}
117
106
}
118
107
/* Create a new plugin */
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){
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
124
110
return NULL;
125
111
}
126
112
char *copy_name = NULL;
127
113
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
114
copy_name = strdup(name);
131
115
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
116
return NULL;
136
117
}
137
118
}
138
119
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
143
124
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;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
149
127
free(copy_name);
150
128
free(new_plugin);
151
errno = e;
152
129
return NULL;
153
130
}
154
131
new_plugin->argv[0] = copy_name;
155
132
new_plugin->argv[1] = NULL;
156
133
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
134
new_plugin->environ = malloc(sizeof(char *));
160
135
if(new_plugin->environ == NULL){
161
int e = errno;
162
136
free(copy_name);
163
137
free(new_plugin->argv);
164
138
free(new_plugin);
165
errno = e;
166
139
return NULL;
167
140
}
168
141
new_plugin->environ[0] = NULL;
173
146
}
174
147
175
148
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
149
static bool add_to_char_array(const char *new, char ***array,
178
150
int *len){
179
151
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
196
154
/* Malloc check */
197
if(new_array == NULL){
155
if(*array == NULL){
198
156
return false;
199
157
}
200
*array = new_array;
201
158
/* Make a copy of the new string */
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
159
char *copy = strdup(new);
206
160
if(copy == NULL){
207
161
return false;
208
162
}
215
169
}
216
170
217
171
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
219
172
static bool add_argument(plugin *p, const char *arg){
220
173
if(p == NULL){
221
174
return false;
224
177
}
225
178
226
179
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
228
180
static bool add_environment(plugin *p, const char *def, bool replace){
229
181
if(p == NULL){
230
182
return false;
232
184
/* namelen = length of name of environment variable */
233
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
186
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
237
189
/* It already exists */
238
190
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
244
193
return false;
245
194
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
195
*e = new;
196
strcpy(*e, def);
248
197
}
249
198
return true;
250
199
}
252
201
return add_to_char_array(def, &(p->environ), &(p->envc));
253
202
}
254
203
255
#ifndef O_CLOEXEC
256
204
/*
257
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
206
* Descriptor Flags".
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
260
208
*/
261
__attribute__((warn_unused_result))
262
209
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
210
int ret = fcntl(fd, F_GETFD, 0);
264
211
/* If reading the flags failed, return error indication now. */
265
212
if(ret < 0){
266
213
return ret;
267
214
}
268
215
/* Store modified flag word in the descriptor. */
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
271
217
}
272
#endif /* not O_CLOEXEC */
273
218
274
219
275
220
/* Mark processes as completed when they exit, and save their exit
276
221
status. */
277
222
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
279
223
while(true){
280
224
plugin *proc = plugin_list;
281
225
int status;
285
229
break;
286
230
}
287
231
if(pid == -1){
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
232
if (errno != ECHILD){
233
perror("waitpid");
291
234
}
292
error(0, errno, "waitpid");
235
/* No child processes */
236
break;
293
237
}
294
238
295
239
/* A child exited, find it in process_list */
301
245
continue;
302
246
}
303
247
proc->status = status;
304
proc->completed = 1;
248
proc->completed = true;
305
249
}
306
errno = old_errno;
307
250
}
308
251
309
252
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
253
static bool print_out_password(const char *buffer, size_t length){
312
254
ssize_t ret;
313
255
for(size_t written = 0; written < length; written += (size_t)ret){
321
263
}
322
264
323
265
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
266
static void free_plugin(plugin *plugin_node){
326
267
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
328
269
free(*arg);
329
270
}
330
free(plugin_node->name);
331
271
free(plugin_node->argv);
332
272
for(char **env = plugin_node->environ; *env != NULL; env++){
333
273
free(*env);
334
274
}
335
275
free(plugin_node->environ);
336
276
free(plugin_node->buffer);
337
277
338
278
/* Removes the plugin from the singly-linked list */
339
279
if(plugin_node == plugin_list){
340
280
/* First one - simple */
360
300
361
301
int main(int argc, char *argv[]){
362
302
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
303
char *argfile = NULL;
365
304
FILE *conffp;
366
struct dirent **direntries = NULL;
305
size_t d_name_len;
306
DIR *dir = NULL;
307
struct dirent *dirst;
367
308
struct stat st;
368
309
fd_set rfds_all;
369
310
int ret, maxfd = 0;
370
ssize_t sret;
371
311
uid_t uid = 65534;
372
312
gid_t gid = 65534;
373
313
bool debug = false;
377
317
.sa_flags = SA_NOCLDSTOP };
378
318
char **custom_argv = NULL;
379
319
int custom_argc = 0;
380
int dir_fd = -1;
381
320
382
321
/* Establish a signal handler */
383
322
sigemptyset(&sigchld_action.sa_mask);
384
323
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
385
324
if(ret == -1){
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
325
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
388
327
goto fallback;
389
328
}
390
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
391
330
if(ret == -1){
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
331
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
394
333
goto fallback;
395
334
}
396
335
428
367
.doc = "Group ID the plugins will run as", .group = 3 },
429
368
{ .name = "debug", .key = 132,
430
369
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
444
370
{ .name = NULL }
445
371
};
446
372
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
453
376
case 'g': /* --global-options */
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
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;
459
386
}
460
387
}
461
errno = 0;
462
388
}
463
389
break;
464
390
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
467
396
}
468
397
break;
469
398
case 'o': /* --options-for */
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
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
}
491
418
}
492
419
break;
493
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
494
424
{
495
425
char *envdef = strchr(arg, ':');
496
426
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
427
break;
500
428
}
501
429
*envdef = '\0';
502
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
510
432
}
511
433
}
512
434
break;
513
435
case 'd': /* --disable */
514
{
436
if (arg != NULL){
515
437
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
519
440
}
441
p->disabled = true;
520
442
}
521
443
break;
522
444
case 'e': /* --enable */
523
{
445
if (arg != NULL){
524
446
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
528
449
}
450
p->disabled = false;
529
451
}
530
452
break;
531
453
case 128: /* --plugin-dir */
532
454
free(plugindir);
533
455
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
456
if(plugindir == NULL){
457
perror("strdup");
458
}
537
459
break;
538
460
case 129: /* --config-file */
539
461
/* This is already done by parse_opt_config_file() */
540
462
break;
541
463
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
464
uid = (uid_t)strtol(arg, NULL, 10);
551
465
break;
552
466
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
467
gid = (gid_t)strtol(arg, NULL, 10);
562
468
break;
563
469
case 132: /* --debug */
564
470
debug = true;
565
471
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
472
case ARGP_KEY_ARG:
594
473
/* Cryptsetup always passes an argument, which is an empty
595
474
string if "none" was specified in /etc/crypttab. So if
596
475
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
599
478
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
479
break;
480
case ARGP_KEY_END:
481
break;
605
482
default:
606
483
return ARGP_ERR_UNKNOWN;
607
484
}
608
return errno; /* Set to 0 at start */
485
return 0;
609
486
}
610
487
611
488
/* This option parser is the same as parse_opt() above, except it
612
489
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
618
494
case 'g': /* --global-options */
619
495
case 'G': /* --global-env */
620
496
case 'o': /* --options-for */
626
502
case 129: /* --config-file */
627
503
free(argfile);
628
504
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
505
if(argfile == NULL){
506
perror("strdup");
631
507
}
632
break;
508
break;
633
509
case 130: /* --userid */
634
510
case 131: /* --groupid */
635
511
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
641
514
break;
642
515
default:
643
516
return ARGP_ERR_UNKNOWN;
644
517
}
645
return errno;
518
return 0;
646
519
}
647
520
648
521
struct argp argp = { .options = options,
650
523
.args_doc = "",
651
524
.doc = "Mandos plugin runner -- Run plugins" };
652
525
653
/* Parse using parse_opt_config_file() in order to get the custom
526
/* Parse using the parse_opt_config_file in order to get the custom
654
527
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
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;
669
532
goto fallback;
670
533
}
671
534
673
536
argp.parser = parse_opt;
674
537
675
538
/* Open the configfile if available */
676
if(argfile == NULL){
539
if (argfile == NULL){
677
540
conffp = fopen(AFILE, "r");
678
541
} else {
679
542
conffp = fopen(argfile, "r");
680
}
543
}
681
544
if(conffp != NULL){
682
545
char *org_line = NULL;
683
546
char *p, *arg, *new_arg, *line;
684
547
size_t size = 0;
548
ssize_t sret;
685
549
const char whitespace_delims[] = " \r\t\f\v\n";
686
550
const char comment_delim[] = "#";
687
551
688
552
custom_argc = 1;
689
553
custom_argv = malloc(sizeof(char*) * 2);
690
554
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
693
557
goto fallback;
694
558
}
695
559
custom_argv[0] = argv[0];
696
560
custom_argv[1] = NULL;
697
561
698
562
/* for each line in the config file, strip whitespace and ignore
699
563
commented text */
700
564
while(true){
702
566
if(sret == -1){
703
567
break;
704
568
}
705
569
706
570
line = org_line;
707
571
arg = strsep(&line, comment_delim);
708
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
711
575
}
712
576
new_arg = strdup(p);
713
577
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
716
580
free(org_line);
717
581
goto fallback;
718
582
}
719
583
720
584
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
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;
744
592
}
745
593
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
594
custom_argv[custom_argc] = NULL;
747
595
}
748
596
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
757
597
free(org_line);
758
598
} else {
759
599
/* Check for harmful errors and go to fallback. Other errors might
760
600
not affect opening plugins */
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
764
604
goto fallback;
765
605
}
766
606
}
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
769
609
if(custom_argv != NULL){
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
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;
784
615
goto fallback;
785
616
}
786
617
}
787
618
788
619
/* Parse actual command line arguments, to let them override the
789
620
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
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;
823
626
}
824
627
825
628
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
631
p->name ? p->name : "Global", p->argc - 1);
829
632
for(char **a = p->argv; *a != NULL; a++){
830
633
fprintf(stderr, "\tArg: %s\n", *a);
831
634
}
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
833
636
for(char **a = p->environ; *a != NULL; a++){
834
637
fprintf(stderr, "\t%s\n", *a);
835
638
}
836
639
}
837
640
}
838
641
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
642
/* Strip permissions down to nobody */
868
643
ret = setuid(uid);
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
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 */
874
665
{
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
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;
919
673
}
920
674
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
931
675
}
932
676
933
677
FD_ZERO(&rfds_all);
934
678
935
679
/* Read and execute any executable in the plugin directory*/
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
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-divert", NULL };
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
705
size_t pre_len = strlen(*pre);
706
if((d_name_len >= pre_len)
707
and strncmp((dirst->d_name), *pre, pre_len) == 0){
708
if(debug){
709
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
710
" with bad prefix %s\n", dirst->d_name, *pre);
711
}
712
bad_name = true;
713
break;
714
}
715
}
716
if(bad_name){
717
continue;
718
}
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
size_t suf_len = strlen(*suf);
721
if((d_name_len >= suf_len)
722
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
723
== 0)){
724
if(debug){
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
726
" with bad suffix %s\n", dirst->d_name, *suf);
727
}
728
bad_name = true;
729
break;
730
}
731
}
732
733
if(bad_name){
734
continue;
735
}
736
}
737
738
char *filename;
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
744
if(ret < 0){
745
perror("asprintf");
746
continue;
747
}
748
749
ret = stat(filename, &st);
750
if (ret == -1){
751
perror("stat");
752
free(filename);
753
continue;
754
}
755
952
756
/* Ignore non-executable files */
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
956
758
if(debug){
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
760
" with bad type or mode\n", filename);
961
761
}
962
close(plugin_fd);
963
free(direntries[i]);
762
free(filename);
964
763
continue;
965
764
}
966
765
967
plugin *p = getplugin(direntries[i]->d_name);
766
plugin *p = getplugin(dirst->d_name);
968
767
if(p == NULL){
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
768
perror("getplugin");
769
free(filename);
972
770
continue;
973
771
}
974
772
if(p->disabled){
975
773
if(debug){
976
774
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
977
direntries[i]->d_name);
775
dirst->d_name);
978
776
}
979
close(plugin_fd);
980
free(direntries[i]);
777
free(filename);
981
778
continue;
982
779
}
983
780
{
986
783
if(g != NULL){
987
784
for(char **a = g->argv + 1; *a != NULL; a++){
988
785
if(not add_argument(p, *a)){
989
error(0, errno, "add_argument");
786
perror("add_argument");
990
787
}
991
788
}
992
789
/* Add global environment variables */
993
790
for(char **e = g->environ; *e != NULL; e++){
994
791
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
792
perror("add_environment");
996
793
}
997
794
}
998
795
}
999
796
}
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
797
/* If this plugin has any environment variables, we will call
798
using execve and need to duplicate the environment from this
799
process, too. */
1002
800
if(p->environ[0] != NULL){
1003
801
for(char **e = environ; *e != NULL; e++){
1004
802
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
803
perror("add_environment");
1006
804
}
1007
805
}
1008
806
}
1009
807
1010
808
int pipefd[2];
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
809
ret = pipe(pipefd);
810
if (ret == -1){
811
perror("pipe");
812
exitstatus = EXIT_FAILURE;
813
goto fallback;
814
}
1032
815
/* Ask OS to automatic close the pipe on exec */
1033
816
ret = set_cloexec_flag(pipefd[0]);
1034
817
if(ret < 0){
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
1040
820
goto fallback;
1041
821
}
1042
822
ret = set_cloexec_flag(pipefd[1]);
1043
823
if(ret < 0){
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
1049
826
goto fallback;
1050
827
}
1051
#endif /* not O_CLOEXEC */
1052
828
/* Block SIGCHLD until process is safely in process list */
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1056
830
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
831
perror("sigprocmask");
832
exitstatus = EXIT_FAILURE;
1060
833
goto fallback;
1061
834
}
1062
835
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
836
pid_t pid = fork();
1067
837
if(pid == -1){
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
838
perror("fork");
839
exitstatus = EXIT_FAILURE;
1075
840
goto fallback;
1076
841
}
1077
842
if(pid == 0){
1078
843
/* this is the child process */
1079
844
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1080
845
if(ret < 0){
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
846
perror("sigaction");
847
_exit(EXIT_FAILURE);
1083
848
}
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
850
if(ret < 0){
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
851
perror("sigprocmask");
852
_exit(EXIT_FAILURE);
1088
853
}
1089
854
1090
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1091
856
if(ret == -1){
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
857
perror("dup2");
858
_exit(EXIT_FAILURE);
1094
859
}
1095
860
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
861
if(dirfd(dir) < 0){
862
/* If dir has no file descriptor, we could not set FD_CLOEXEC
863
above and must now close it manually here. */
864
closedir(dir);
865
}
866
if(p->environ[0] == NULL){
867
if(execv(filename, p->argv) < 0){
868
perror("execv");
869
_exit(EXIT_FAILURE);
870
}
871
} else {
872
if(execve(filename, p->argv, p->environ) < 0){
873
perror("execve");
874
_exit(EXIT_FAILURE);
875
}
1102
876
}
1103
877
/* no return */
1104
878
}
1105
879
/* Parent process */
1106
880
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
881
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
886
if(ret < 0){
1115
error(0, errno, "sigprocmask");
887
perror("sigprocmask");
1116
888
}
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
889
exitstatus = EXIT_FAILURE;
1119
890
goto fallback;
1120
891
}
1121
free(direntries[i]);
1122
892
1123
893
new_plugin->pid = pid;
1124
894
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
895
1131
896
/* Unblock SIGCHLD so signal handler can be run if this process
1132
897
has already completed */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1136
899
if(ret < 0){
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
900
perror("sigprocmask");
901
exitstatus = EXIT_FAILURE;
1139
902
goto fallback;
1140
903
}
1141
904
1142
905
FD_SET(new_plugin->fd, &rfds_all);
1143
906
1144
if(maxfd < new_plugin->fd){
907
if (maxfd < new_plugin->fd){
1145
908
maxfd = new_plugin->fd;
1146
909
}
910
1147
911
}
1148
912
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
913
closedir(dir);
914
dir = NULL;
915
1155
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
1156
917
if(p->pid != 0){
1157
918
break;
1162
923
free_plugin_list();
1163
924
}
1164
925
}
1165
926
1166
927
/* Main loop while running plugins exist */
1167
928
while(plugin_list){
1168
929
fd_set rfds = rfds_all;
1169
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
931
if (select_ret == -1){
932
perror("select");
933
exitstatus = EXIT_FAILURE;
1173
934
goto fallback;
1174
935
}
1175
936
/* OK, now either a process completed, or something can be read
1176
937
from one of them */
1177
938
for(plugin *proc = plugin_list; proc != NULL;){
1178
939
/* Is this process completely done? */
1179
if(proc->completed and proc->eof){
940
if(proc->eof and proc->completed){
1180
941
/* Only accept the plugin output if it exited cleanly */
1181
942
if(not WIFEXITED(proc->status)
1182
943
or WEXITSTATUS(proc->status) != 0){
1183
944
/* Bad exit by plugin */
1184
945
1185
946
if(debug){
1186
947
if(WIFEXITED(proc->status)){
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1190
950
WEXITSTATUS(proc->status));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(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));
1197
958
}
1198
959
}
1199
960
1200
961
/* Remove the plugin */
1201
962
FD_CLR(proc->fd, &rfds_all);
1202
963
1203
964
/* Block signal while modifying process_list */
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
1208
if(ret < 0){
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
1211
goto fallback;
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
if(ret < 0){
967
perror("sigprocmask");
968
exitstatus = EXIT_FAILURE;
969
goto fallback;
970
}
971
972
/* We are done modifying process list, so unblock signal */
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
NULL);
975
if(ret < 0){
976
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
1212
983
}
1213
984
1214
985
plugin *next_plugin = proc->next;
1215
986
free_plugin(proc);
1216
987
proc = next_plugin;
1217
1218
/* We are done modifying process list, so unblock signal */
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
1222
if(ret < 0){
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1225
goto fallback;
1226
}
1227
1228
if(plugin_list == NULL){
1229
break;
1230
}
1231
1232
988
continue;
1233
989
}
1234
990
1235
991
/* This process exited nicely, so print its buffer */
1236
992
1237
993
bool bret = print_out_password(proc->buffer,
1238
994
proc->buffer_length);
1239
995
if(not bret){
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1242
998
}
1243
999
goto fallback;
1244
1000
}
1251
1007
}
1252
1008
/* Before reading, make the process' data buffer large enough */
1253
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1259
1015
goto fallback;
1260
1016
}
1261
proc->buffer = new_buffer;
1262
1017
proc->buffer_size += BUFFER_SIZE;
1263
1018
}
1264
1019
/* Read from the process */
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1270
1023
/* Read error from this process; ignore the error */
1271
1024
proc = proc->next;
1272
1025
continue;
1273
1026
}
1274
if(sret == 0){
1027
if(ret == 0){
1275
1028
/* got EOF */
1276
1029
proc->eof = true;
1277
1030
} else {
1278
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1279
1032
}
1280
1033
}
1281
1034
}
1282
1283
1035
1036
1284
1037
fallback:
1285
1038
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1288
1040
/* Fallback if all plugins failed, none are found or an error
1289
1041
occured */
1290
1042
bool bret;
1298
1050
}
1299
1051
bret = print_out_password(passwordbuffer, len);
1300
1052
if(not bret){
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1303
1055
}
1304
1056
}
1305
1057
1306
1058
/* Restore old signal handler */
1307
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1308
1060
if(ret == -1){
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1311
1063
}
1312
1064
1313
1065
if(custom_argv != NULL){
1314
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1315
1067
free(*arg);
1317
1069
free(custom_argv);
1318
1070
}
1319
1071
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1072
if(dir != NULL){
1073
closedir(dir);
1324
1074
}
1325
1075
1326
/* Kill the processes */
1076
/* Free the process list and kill the processes */
1327
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1328
1078
if(p->pid != 0){
1329
1079
close(p->fd);
1330
1080
ret = kill(p->pid, SIGTERM);
1331
1081
if(ret == -1 and errno != ESRCH){
1332
1082
/* Set-uid proccesses might not get closed */
1333
error(0, errno, "kill");
1083
perror("kill");
1334
1084
}
1335
1085
}
1336
1086
}
1337
1087
1338
1088
/* Wait for any remaining child processes to terminate */
1339
do {
1089
do{
1340
1090
ret = wait(NULL);
1341
1091
} while(ret >= 0);
1342
1092
if(errno != ECHILD){
1343
error(0, errno, "wait");
1093
perror("wait");
1344
1094
}
1345
1095
1346
1096
free_plugin_list();
1347
1097
1348
1098
free(plugindir);
1349
free(pluginhelperdir);
1350
1099
free(argfile);
1351
1100
1352
1101
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0