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 176
- compare with another revision
- download diff
- download tarball
- view history from revision 176
- Committer: Teddy Hogeborn
- Date: 2008-09-07 01:44:44 UTC
- mfrom: (24.1.93 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080907014444-cf4ilzndc0tbn8va
Merge & resolve.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- 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(), exit(), EXIT_SUCCESS,
30
realloc() */
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>";
74
75
struct plugin;
84
76
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
89
81
char **environ;
90
82
int envc;
91
83
bool disabled;
92
84
93
85
/* Variables used for running processes*/
94
86
pid_t pid;
95
87
int fd;
97
89
size_t buffer_size;
98
90
size_t buffer_length;
99
91
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
92
volatile bool completed;
93
volatile int status;
102
94
struct plugin *next;
103
95
} plugin;
104
96
106
98
107
99
/* Gets an existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
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))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
115
106
return p;
116
107
}
117
108
}
118
109
/* 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){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
124
112
return NULL;
125
113
}
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
118
return NULL;
136
119
}
137
120
}
138
121
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
143
126
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
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
149
129
free(copy_name);
150
130
free(new_plugin);
151
errno = e;
152
131
return NULL;
153
132
}
154
133
new_plugin->argv[0] = copy_name;
155
134
new_plugin->argv[1] = NULL;
156
135
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
160
137
if(new_plugin->environ == NULL){
161
int e = errno;
162
138
free(copy_name);
163
139
free(new_plugin->argv);
164
140
free(new_plugin);
165
errno = e;
166
141
return NULL;
167
142
}
168
143
new_plugin->environ[0] = NULL;
173
148
}
174
149
175
150
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
151
static bool add_to_char_array(const char *new, char ***array,
178
152
int *len){
179
153
/* Resize the pointed-to array to hold one more pointer */
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
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
185
156
/* Malloc check */
186
if(new_array == NULL){
157
if(*array == NULL){
187
158
return false;
188
159
}
189
*array = new_array;
190
160
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
195
162
if(copy == NULL){
196
163
return false;
197
164
}
204
171
}
205
172
206
173
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
174
static bool add_argument(plugin *p, const char *arg){
209
175
if(p == NULL){
210
176
return false;
213
179
}
214
180
215
181
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
182
static bool add_environment(plugin *p, const char *def, bool replace){
218
183
if(p == NULL){
219
184
return false;
221
186
/* namelen = length of name of environment variable */
222
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
188
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
226
191
/* It already exists */
227
192
if(replace){
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
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
233
195
return false;
234
196
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
237
199
}
238
200
return true;
239
201
}
241
203
return add_to_char_array(def, &(p->environ), &(p->envc));
242
204
}
243
205
244
#ifndef O_CLOEXEC
245
206
/*
246
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
208
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
210
*/
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
253
214
/* If reading the flags failed, return error indication now. */
254
215
if(ret < 0){
255
216
return ret;
256
217
}
257
218
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
220
}
261
#endif /* not O_CLOEXEC */
262
221
263
222
264
223
/* Mark processes as completed when they exit, and save their exit
265
224
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
268
226
while(true){
269
227
plugin *proc = plugin_list;
270
228
int status;
274
232
break;
275
233
}
276
234
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
235
if (errno != ECHILD){
236
perror("waitpid");
280
237
}
281
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
282
240
}
283
241
284
242
/* A child exited, find it in process_list */
290
248
continue;
291
249
}
292
250
proc->status = status;
293
proc->completed = 1;
251
proc->completed = true;
294
252
}
295
errno = old_errno;
296
253
}
297
254
298
255
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
301
257
ssize_t ret;
302
258
for(size_t written = 0; written < length; written += (size_t)ret){
303
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
310
266
}
311
267
312
268
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
269
static void free_plugin(plugin *plugin_node){
315
270
316
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
322
277
}
323
278
free(plugin_node->environ);
324
279
free(plugin_node->buffer);
325
280
326
281
/* Removes the plugin from the singly-linked list */
327
282
if(plugin_node == plugin_list){
328
283
/* First one - simple */
348
303
349
304
int main(int argc, char *argv[]){
350
305
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
306
char *argfile = NULL;
353
307
FILE *conffp;
354
struct dirent **direntries = NULL;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
355
311
struct stat st;
356
312
fd_set rfds_all;
357
313
int ret, maxfd = 0;
358
ssize_t sret;
359
314
uid_t uid = 65534;
360
315
gid_t gid = 65534;
361
316
bool debug = false;
365
320
.sa_flags = SA_NOCLDSTOP };
366
321
char **custom_argv = NULL;
367
322
int custom_argc = 0;
368
int dir_fd = -1;
369
323
370
324
/* Establish a signal handler */
371
325
sigemptyset(&sigchld_action.sa_mask);
372
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
327
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
376
330
goto fallback;
377
331
}
378
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
333
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
382
336
goto fallback;
383
337
}
384
338
416
370
.doc = "Group ID the plugins will run as", .group = 3 },
417
371
{ .name = "debug", .key = 132,
418
372
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
432
373
{ .name = NULL }
433
374
};
434
375
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
441
379
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
447
389
}
448
390
}
449
errno = 0;
450
391
}
451
392
break;
452
393
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
455
399
}
456
400
break;
457
401
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
479
421
}
480
422
break;
481
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
482
427
{
483
428
char *envdef = strchr(arg, ':');
484
429
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
430
break;
488
431
}
489
432
*envdef = '\0';
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
498
435
}
499
436
}
500
437
break;
501
438
case 'd': /* --disable */
502
{
439
if (arg != NULL){
503
440
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
507
443
}
444
p->disabled = true;
508
445
}
509
446
break;
510
447
case 'e': /* --enable */
511
{
448
if (arg != NULL){
512
449
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
516
452
}
453
p->disabled = false;
517
454
}
518
455
break;
519
456
case 128: /* --plugin-dir */
520
457
free(plugindir);
521
458
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
459
if(plugindir == NULL){
460
perror("strdup");
461
}
525
462
break;
526
463
case 129: /* --config-file */
527
464
/* This is already done by parse_opt_config_file() */
528
465
break;
529
466
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
467
uid = (uid_t)strtol(arg, NULL, 10);
539
468
break;
540
469
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
470
gid = (gid_t)strtol(arg, NULL, 10);
550
471
break;
551
472
case 132: /* --debug */
552
473
debug = true;
553
474
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
475
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
476
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
477
break;
478
case ARGP_KEY_END:
479
break;
586
480
default:
587
481
return ARGP_ERR_UNKNOWN;
588
482
}
589
return errno; /* Set to 0 at start */
483
return 0;
590
484
}
591
485
592
486
/* This option parser is the same as parse_opt() above, except it
593
487
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
488
error_t parse_opt_config_file (int key, char *arg,
489
__attribute__((unused))
490
struct argp_state *state) {
491
switch (key) {
599
492
case 'g': /* --global-options */
600
493
case 'G': /* --global-env */
601
494
case 'o': /* --options-for */
607
500
case 129: /* --config-file */
608
501
free(argfile);
609
502
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
503
if(argfile == NULL){
504
perror("strdup");
612
505
}
613
break;
506
break;
614
507
case 130: /* --userid */
615
508
case 131: /* --groupid */
616
509
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
510
case ARGP_KEY_ARG:
511
case ARGP_KEY_END:
622
512
break;
623
513
default:
624
514
return ARGP_ERR_UNKNOWN;
625
515
}
626
return errno;
516
return 0;
627
517
}
628
518
629
519
struct argp argp = { .options = options,
631
521
.args_doc = "",
632
522
.doc = "Mandos plugin runner -- Run plugins" };
633
523
634
/* Parse using parse_opt_config_file() in order to get the custom
524
/* Parse using the parse_opt_config_file in order to get the custom
635
525
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
527
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
529
exitstatus = EXIT_FAILURE;
650
530
goto fallback;
651
531
}
652
532
654
534
argp.parser = parse_opt;
655
535
656
536
/* Open the configfile if available */
657
if(argfile == NULL){
537
if (argfile == NULL){
658
538
conffp = fopen(AFILE, "r");
659
539
} else {
660
540
conffp = fopen(argfile, "r");
661
}
541
}
662
542
if(conffp != NULL){
663
543
char *org_line = NULL;
664
544
char *p, *arg, *new_arg, *line;
665
545
size_t size = 0;
546
ssize_t sret;
666
547
const char whitespace_delims[] = " \r\t\f\v\n";
667
548
const char comment_delim[] = "#";
668
549
669
550
custom_argc = 1;
670
551
custom_argv = malloc(sizeof(char*) * 2);
671
552
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
553
perror("malloc");
554
exitstatus = EXIT_FAILURE;
674
555
goto fallback;
675
556
}
676
557
custom_argv[0] = argv[0];
677
558
custom_argv[1] = NULL;
678
559
679
560
/* for each line in the config file, strip whitespace and ignore
680
561
commented text */
681
562
while(true){
683
564
if(sret == -1){
684
565
break;
685
566
}
686
567
687
568
line = org_line;
688
569
arg = strsep(&line, comment_delim);
689
570
while((p = strsep(&arg, whitespace_delims)) != NULL){
692
573
}
693
574
new_arg = strdup(p);
694
575
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
697
578
free(org_line);
698
579
goto fallback;
699
580
}
700
581
701
582
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
714
590
}
715
591
custom_argv[custom_argc-1] = new_arg;
716
custom_argv[custom_argc] = NULL;
592
custom_argv[custom_argc] = NULL;
717
593
}
718
594
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
727
595
free(org_line);
728
596
} else {
729
597
/* Check for harmful errors and go to fallback. Other errors might
730
598
not affect opening plugins */
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
734
602
goto fallback;
735
603
}
736
604
}
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
739
607
if(custom_argv != NULL){
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
754
613
goto fallback;
755
614
}
756
615
}
757
616
758
617
/* Parse actual command line arguments, to let them override the
759
618
config file */
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
792
}
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
623
goto fallback;
793
624
}
794
625
795
626
if(debug){
796
for(plugin *p = plugin_list; p != NULL; p = p->next){
627
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
628
fprintf(stderr, "Plugin: %s has %d arguments\n",
798
629
p->name ? p->name : "Global", p->argc - 1);
799
630
for(char **a = p->argv; *a != NULL; a++){
800
631
fprintf(stderr, "\tArg: %s\n", *a);
801
632
}
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
634
for(char **a = p->environ; *a != NULL; a++){
804
635
fprintf(stderr, "\t%s\n", *a);
805
636
}
806
637
}
807
638
}
808
639
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<https://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
640
/* Strip permissions down to nobody */
838
641
ret = setuid(uid);
839
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
642
if (ret == -1){
643
perror("setuid");
644
}
645
setgid(gid);
646
if (ret == -1){
647
perror("setgid");
648
}
649
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
656
if(dir == NULL){
657
perror("Could not open plugin dir");
658
exitstatus = EXIT_FAILURE;
659
goto fallback;
660
}
661
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
844
663
{
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
664
int dir_fd = dirfd(dir);
665
if(dir_fd >= 0){
666
ret = set_cloexec_flag(dir_fd);
667
if(ret < 0){
668
perror("set_cloexec_flag");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
889
671
}
890
672
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
901
673
}
902
674
903
675
FD_ZERO(&rfds_all);
904
676
905
677
/* Read and execute any executable in the plugin directory*/
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
912
continue;
913
}
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
if(ret == -1){
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
919
continue;
920
}
921
678
while(true){
679
dirst = readdir(dir);
680
681
/* All directory entries have been processed */
682
if(dirst == NULL){
683
if (errno == EBADF){
684
perror("readdir");
685
exitstatus = EXIT_FAILURE;
686
goto fallback;
687
}
688
break;
689
}
690
691
d_name_len = strlen(dirst->d_name);
692
693
/* Ignore dotfiles, backup files and other junk */
694
{
695
bool bad_name = false;
696
697
const char const *bad_prefixes[] = { ".", "#", NULL };
698
699
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
700
".dpkg-old",
701
".dpkg-divert", NULL };
702
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
703
size_t pre_len = strlen(*pre);
704
if((d_name_len >= pre_len)
705
and strncmp((dirst->d_name), *pre, pre_len) == 0){
706
if(debug){
707
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
708
" with bad prefix %s\n", dirst->d_name, *pre);
709
}
710
bad_name = true;
711
break;
712
}
713
}
714
if(bad_name){
715
continue;
716
}
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
size_t suf_len = strlen(*suf);
719
if((d_name_len >= suf_len)
720
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
721
== 0)){
722
if(debug){
723
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
724
" with bad suffix %s\n", dirst->d_name, *suf);
725
}
726
bad_name = true;
727
break;
728
}
729
}
730
731
if(bad_name){
732
continue;
733
}
734
}
735
736
char *filename;
737
if(plugindir == NULL){
738
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
739
} else {
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
}
742
if(ret < 0){
743
perror("asprintf");
744
continue;
745
}
746
747
ret = stat(filename, &st);
748
if (ret == -1){
749
perror("stat");
750
free(filename);
751
continue;
752
}
753
922
754
/* Ignore non-executable files */
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
755
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
926
756
if(debug){
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
757
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
758
" with bad type or mode\n", filename);
931
759
}
932
close(plugin_fd);
933
free(direntries[i]);
760
free(filename);
934
761
continue;
935
762
}
936
763
937
plugin *p = getplugin(direntries[i]->d_name);
764
plugin *p = getplugin(dirst->d_name);
938
765
if(p == NULL){
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
766
perror("getplugin");
767
free(filename);
942
768
continue;
943
769
}
944
770
if(p->disabled){
945
771
if(debug){
946
772
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
947
direntries[i]->d_name);
773
dirst->d_name);
948
774
}
949
close(plugin_fd);
950
free(direntries[i]);
775
free(filename);
951
776
continue;
952
777
}
953
778
{
956
781
if(g != NULL){
957
782
for(char **a = g->argv + 1; *a != NULL; a++){
958
783
if(not add_argument(p, *a)){
959
error(0, errno, "add_argument");
784
perror("add_argument");
960
785
}
961
786
}
962
787
/* Add global environment variables */
963
788
for(char **e = g->environ; *e != NULL; e++){
964
789
if(not add_environment(p, *e, false)){
965
error(0, errno, "add_environment");
790
perror("add_environment");
966
791
}
967
792
}
968
793
}
969
794
}
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
795
/* If this plugin has any environment variables, we will call
796
using execve and need to duplicate the environment from this
797
process, too. */
972
798
if(p->environ[0] != NULL){
973
799
for(char **e = environ; *e != NULL; e++){
974
800
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
801
perror("add_environment");
976
802
}
977
803
}
978
804
}
979
805
980
806
int pipefd[2];
981
#ifndef O_CLOEXEC
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
986
if(ret == -1){
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
807
ret = pipe(pipefd);
808
if (ret == -1){
809
perror("pipe");
810
exitstatus = EXIT_FAILURE;
811
goto fallback;
812
}
1002
813
/* Ask OS to automatic close the pipe on exec */
1003
814
ret = set_cloexec_flag(pipefd[0]);
1004
815
if(ret < 0){
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
816
perror("set_cloexec_flag");
817
exitstatus = EXIT_FAILURE;
1010
818
goto fallback;
1011
819
}
1012
820
ret = set_cloexec_flag(pipefd[1]);
1013
821
if(ret < 0){
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
822
perror("set_cloexec_flag");
823
exitstatus = EXIT_FAILURE;
1019
824
goto fallback;
1020
825
}
1021
#endif /* not O_CLOEXEC */
1022
826
/* Block SIGCHLD until process is safely in process list */
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
1025
NULL));
827
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1026
828
if(ret < 0){
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
829
perror("sigprocmask");
830
exitstatus = EXIT_FAILURE;
1030
831
goto fallback;
1031
832
}
1032
833
/* Starting a new process to be watched */
1033
pid_t pid;
1034
do {
1035
pid = fork();
1036
} while(pid == -1 and errno == EINTR);
834
pid_t pid = fork();
1037
835
if(pid == -1){
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
836
perror("fork");
837
exitstatus = EXIT_FAILURE;
1045
838
goto fallback;
1046
839
}
1047
840
if(pid == 0){
1048
841
/* this is the child process */
1049
842
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1050
843
if(ret < 0){
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
844
perror("sigaction");
845
_exit(EXIT_FAILURE);
1053
846
}
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
848
if(ret < 0){
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
849
perror("sigprocmask");
850
_exit(EXIT_FAILURE);
1058
851
}
1059
852
1060
853
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1061
854
if(ret == -1){
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
855
perror("dup2");
856
_exit(EXIT_FAILURE);
1064
857
}
1065
858
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
859
if(dirfd(dir) < 0){
860
/* If dir has no file descriptor, we could not set FD_CLOEXEC
861
above and must now close it manually here. */
862
closedir(dir);
863
}
864
if(p->environ[0] == NULL){
865
if(execv(filename, p->argv) < 0){
866
perror("execv");
867
_exit(EXIT_FAILURE);
868
}
869
} else {
870
if(execve(filename, p->argv, p->environ) < 0){
871
perror("execve");
872
_exit(EXIT_FAILURE);
873
}
1072
874
}
1073
875
/* no return */
1074
876
}
1075
877
/* Parent process */
1076
878
close(pipefd[1]); /* Close unused write end of pipe */
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
NULL)));
879
free(filename);
880
plugin *new_plugin = getplugin(dirst->d_name);
881
if (new_plugin == NULL){
882
perror("getplugin");
883
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1084
884
if(ret < 0){
1085
error(0, errno, "sigprocmask");
885
perror("sigprocmask");
1086
886
}
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
887
exitstatus = EXIT_FAILURE;
1089
888
goto fallback;
1090
889
}
1091
free(direntries[i]);
1092
890
1093
891
new_plugin->pid = pid;
1094
892
new_plugin->fd = pipefd[0];
1095
893
1096
894
/* Unblock SIGCHLD so signal handler can be run if this process
1097
895
has already completed */
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
1100
NULL));
896
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1101
897
if(ret < 0){
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
898
perror("sigprocmask");
899
exitstatus = EXIT_FAILURE;
1104
900
goto fallback;
1105
901
}
1106
902
1107
903
FD_SET(new_plugin->fd, &rfds_all);
1108
904
1109
if(maxfd < new_plugin->fd){
905
if (maxfd < new_plugin->fd){
1110
906
maxfd = new_plugin->fd;
1111
907
}
908
1112
909
}
1113
910
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
1118
free_plugin(getplugin(NULL));
1119
911
closedir(dir);
912
dir = NULL;
913
1120
914
for(plugin *p = plugin_list; p != NULL; p = p->next){
1121
915
if(p->pid != 0){
1122
916
break;
1127
921
free_plugin_list();
1128
922
}
1129
923
}
1130
924
1131
925
/* Main loop while running plugins exist */
1132
926
while(plugin_list){
1133
927
fd_set rfds = rfds_all;
1134
928
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
929
if (select_ret == -1){
930
perror("select");
931
exitstatus = EXIT_FAILURE;
1138
932
goto fallback;
1139
933
}
1140
934
/* OK, now either a process completed, or something can be read
1141
935
from one of them */
1142
936
for(plugin *proc = plugin_list; proc != NULL;){
1143
937
/* Is this process completely done? */
1144
if(proc->completed and proc->eof){
938
if(proc->eof and proc->completed){
1145
939
/* Only accept the plugin output if it exited cleanly */
1146
940
if(not WIFEXITED(proc->status)
1147
941
or WEXITSTATUS(proc->status) != 0){
1148
942
/* Bad exit by plugin */
1149
943
1150
944
if(debug){
1151
945
if(WIFEXITED(proc->status)){
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
946
fprintf(stderr, "Plugin %u exited with status %d\n",
947
(unsigned int) (proc->pid),
1155
948
WEXITSTATUS(proc->status));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(proc->status)));
949
} else if(WIFSIGNALED(proc->status)) {
950
fprintf(stderr, "Plugin %u killed by signal %d\n",
951
(unsigned int) (proc->pid),
952
WTERMSIG(proc->status));
953
} else if(WCOREDUMP(proc->status)){
954
fprintf(stderr, "Plugin %d dumped core\n",
955
(unsigned int) (proc->pid));
1162
956
}
1163
957
}
1164
958
1165
959
/* Remove the plugin */
1166
960
FD_CLR(proc->fd, &rfds_all);
1167
961
1168
962
/* Block signal while modifying process_list */
1169
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1170
(SIG_BLOCK,
1171
&sigchld_action.sa_mask,
1172
NULL));
1173
if(ret < 0){
1174
error(0, errno, "sigprocmask");
1175
exitstatus = EX_OSERR;
1176
goto fallback;
963
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
if(ret < 0){
965
perror("sigprocmask");
966
exitstatus = EXIT_FAILURE;
967
goto fallback;
968
}
969
970
/* We are done modifying process list, so unblock signal */
971
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
972
NULL);
973
if(ret < 0){
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
976
goto fallback;
977
}
978
979
if(plugin_list == NULL){
980
break;
1177
981
}
1178
982
1179
983
plugin *next_plugin = proc->next;
1180
984
free_plugin(proc);
1181
985
proc = next_plugin;
1182
1183
/* We are done modifying process list, so unblock signal */
1184
ret = (int)(TEMP_FAILURE_RETRY
1185
(sigprocmask(SIG_UNBLOCK,
1186
&sigchld_action.sa_mask, NULL)));
1187
if(ret < 0){
1188
error(0, errno, "sigprocmask");
1189
exitstatus = EX_OSERR;
1190
goto fallback;
1191
}
1192
1193
if(plugin_list == NULL){
1194
break;
1195
}
1196
1197
986
continue;
1198
987
}
1199
988
1200
989
/* This process exited nicely, so print its buffer */
1201
990
1202
991
bool bret = print_out_password(proc->buffer,
1203
992
proc->buffer_length);
1204
993
if(not bret){
1205
error(0, errno, "print_out_password");
1206
exitstatus = EX_IOERR;
994
perror("print_out_password");
995
exitstatus = EXIT_FAILURE;
1207
996
}
1208
997
goto fallback;
1209
998
}
1216
1005
}
1217
1006
/* Before reading, make the process' data buffer large enough */
1218
1007
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1219
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1220
+ (size_t) BUFFER_SIZE);
1221
if(new_buffer == NULL){
1222
error(0, errno, "malloc");
1223
exitstatus = EX_OSERR;
1008
proc->buffer = realloc(proc->buffer, proc->buffer_size
1009
+ (size_t) BUFFER_SIZE);
1010
if (proc->buffer == NULL){
1011
perror("malloc");
1012
exitstatus = EXIT_FAILURE;
1224
1013
goto fallback;
1225
1014
}
1226
proc->buffer = new_buffer;
1227
1015
proc->buffer_size += BUFFER_SIZE;
1228
1016
}
1229
1017
/* Read from the process */
1230
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1231
proc->buffer
1232
+ proc->buffer_length,
1233
BUFFER_SIZE));
1234
if(sret < 0){
1018
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1019
BUFFER_SIZE);
1020
if(ret < 0){
1235
1021
/* Read error from this process; ignore the error */
1236
1022
proc = proc->next;
1237
1023
continue;
1238
1024
}
1239
if(sret == 0){
1025
if(ret == 0){
1240
1026
/* got EOF */
1241
1027
proc->eof = true;
1242
1028
} else {
1243
proc->buffer_length += (size_t) sret;
1029
proc->buffer_length += (size_t) ret;
1244
1030
}
1245
1031
}
1246
1032
}
1247
1248
1033
1034
1249
1035
fallback:
1250
1036
1251
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1252
and exitstatus != EX_OK)){
1037
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1253
1038
/* Fallback if all plugins failed, none are found or an error
1254
1039
occured */
1255
1040
bool bret;
1263
1048
}
1264
1049
bret = print_out_password(passwordbuffer, len);
1265
1050
if(not bret){
1266
error(0, errno, "print_out_password");
1267
exitstatus = EX_IOERR;
1051
perror("print_out_password");
1052
exitstatus = EXIT_FAILURE;
1268
1053
}
1269
1054
}
1270
1055
1271
1056
/* Restore old signal handler */
1272
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1273
1058
if(ret == -1){
1274
error(0, errno, "sigaction");
1275
exitstatus = EX_OSERR;
1059
perror("sigaction");
1060
exitstatus = EXIT_FAILURE;
1276
1061
}
1277
1062
1278
1063
if(custom_argv != NULL){
1279
1064
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1280
1065
free(*arg);
1282
1067
free(custom_argv);
1283
1068
}
1284
1069
1285
free(direntries);
1286
1287
if(dir_fd != -1){
1288
close(dir_fd);
1070
if(dir != NULL){
1071
closedir(dir);
1289
1072
}
1290
1073
1291
/* Kill the processes */
1074
/* Free the process list and kill the processes */
1292
1075
for(plugin *p = plugin_list; p != NULL; p = p->next){
1293
1076
if(p->pid != 0){
1294
1077
close(p->fd);
1295
1078
ret = kill(p->pid, SIGTERM);
1296
1079
if(ret == -1 and errno != ESRCH){
1297
1080
/* Set-uid proccesses might not get closed */
1298
error(0, errno, "kill");
1081
perror("kill");
1299
1082
}
1300
1083
}
1301
1084
}
1302
1085
1303
1086
/* Wait for any remaining child processes to terminate */
1304
do {
1087
do{
1305
1088
ret = wait(NULL);
1306
1089
} while(ret >= 0);
1307
1090
if(errno != ECHILD){
1308
error(0, errno, "wait");
1091
perror("wait");
1309
1092
}
1310
1093
1311
1094
free_plugin_list();
1312
1095
1313
1096
free(plugindir);
1314
free(pluginhelperdir);
1315
1097
free(argfile);
1316
1098
1317
1099
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0