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- Committer: Teddy Hogeborn
- Date: 2009-01-06 22:21:53 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 271.
- Revision ID: teddy@fukt.bsnet.se-20090106222153-3b43cfdjyvz1032y
Tags: version-1.0.3-2
* debian/changelog (1.0.3-2): New entry.
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
26
asprintf() */
28
27
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
31
30
#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() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
43
#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
*/
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
52
53
#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() */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
63
62
#include <signal.h> /* struct sigaction, sigemptyset(),
64
63
sigaddset(), sigaction(),
65
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
SIG_UNBLOCK, kill() */
68
66
#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
67
76
68
#define BUFFER_SIZE 256
77
69
78
70
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
72
82
73
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
75
85
76
typedef struct plugin{
86
77
char *name; /* can be NULL or any plugin name */
89
80
char **environ;
90
81
int envc;
91
82
bool disabled;
92
83
93
84
/* Variables used for running processes*/
94
85
pid_t pid;
95
86
int fd;
97
88
size_t buffer_size;
98
89
size_t buffer_length;
99
90
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
91
volatile bool completed;
92
volatile int status;
102
93
struct plugin *next;
103
94
} plugin;
104
95
106
97
107
98
/* Gets an existing plugin based on name,
108
99
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
100
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))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
115
105
return p;
116
106
}
117
107
}
118
108
/* 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){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
124
111
return NULL;
125
112
}
126
113
char *copy_name = NULL;
127
114
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
131
116
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
117
return NULL;
136
118
}
137
119
}
138
120
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
143
125
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;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
149
128
free(copy_name);
150
129
free(new_plugin);
151
errno = e;
152
130
return NULL;
153
131
}
154
132
new_plugin->argv[0] = copy_name;
155
133
new_plugin->argv[1] = NULL;
156
134
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
160
136
if(new_plugin->environ == NULL){
161
int e = errno;
162
137
free(copy_name);
163
138
free(new_plugin->argv);
164
139
free(new_plugin);
165
errno = e;
166
140
return NULL;
167
141
}
168
142
new_plugin->environ[0] = NULL;
173
147
}
174
148
175
149
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
150
static bool add_to_char_array(const char *new, char ***array,
178
151
int *len){
179
152
/* 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);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
185
155
/* Malloc check */
186
if(new_array == NULL){
156
if(*array == NULL){
187
157
return false;
188
158
}
189
*array = new_array;
190
159
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
195
161
if(copy == NULL){
196
162
return false;
197
163
}
204
170
}
205
171
206
172
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
173
static bool add_argument(plugin *p, const char *arg){
209
174
if(p == NULL){
210
175
return false;
213
178
}
214
179
215
180
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
181
static bool add_environment(plugin *p, const char *def, bool replace){
218
182
if(p == NULL){
219
183
return false;
221
185
/* namelen = length of name of environment variable */
222
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
187
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
226
190
/* It already exists */
227
191
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){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
233
194
return false;
234
195
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
196
*e = new;
197
strcpy(*e, def);
237
198
}
238
199
return true;
239
200
}
241
202
return add_to_char_array(def, &(p->environ), &(p->envc));
242
203
}
243
204
244
#ifndef O_CLOEXEC
245
205
/*
246
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
207
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
209
*/
250
__attribute__((warn_unused_result))
251
210
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
253
212
/* If reading the flags failed, return error indication now. */
254
213
if(ret < 0){
255
214
return ret;
256
215
}
257
216
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
218
}
261
#endif /* not O_CLOEXEC */
262
219
263
220
264
221
/* Mark processes as completed when they exit, and save their exit
265
222
status. */
266
223
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
224
while(true){
269
225
plugin *proc = plugin_list;
270
226
int status;
274
230
break;
275
231
}
276
232
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
233
if (errno != ECHILD){
234
perror("waitpid");
280
235
}
281
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
282
238
}
283
239
284
240
/* A child exited, find it in process_list */
290
246
continue;
291
247
}
292
248
proc->status = status;
293
proc->completed = 1;
249
proc->completed = true;
294
250
}
295
errno = old_errno;
296
251
}
297
252
298
253
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
254
static bool print_out_password(const char *buffer, size_t length){
301
255
ssize_t ret;
302
256
for(size_t written = 0; written < length; written += (size_t)ret){
310
264
}
311
265
312
266
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
267
static void free_plugin(plugin *plugin_node){
315
268
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
270
free(*arg);
318
271
}
319
free(plugin_node->name);
320
272
free(plugin_node->argv);
321
273
for(char **env = plugin_node->environ; *env != NULL; env++){
322
274
free(*env);
323
275
}
324
276
free(plugin_node->environ);
325
277
free(plugin_node->buffer);
326
278
327
279
/* Removes the plugin from the singly-linked list */
328
280
if(plugin_node == plugin_list){
329
281
/* First one - simple */
349
301
350
302
int main(int argc, char *argv[]){
351
303
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
304
char *argfile = NULL;
354
305
FILE *conffp;
355
struct dirent **direntries = NULL;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
356
309
struct stat st;
357
310
fd_set rfds_all;
358
311
int ret, maxfd = 0;
359
ssize_t sret;
360
312
uid_t uid = 65534;
361
313
gid_t gid = 65534;
362
314
bool debug = false;
366
318
.sa_flags = SA_NOCLDSTOP };
367
319
char **custom_argv = NULL;
368
320
int custom_argc = 0;
369
int dir_fd = -1;
370
321
371
322
/* Establish a signal handler */
372
323
sigemptyset(&sigchld_action.sa_mask);
373
324
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
325
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
326
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
377
328
goto fallback;
378
329
}
379
330
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
331
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
332
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
383
334
goto fallback;
384
335
}
385
336
417
368
.doc = "Group ID the plugins will run as", .group = 3 },
418
369
{ .name = "debug", .key = 132,
419
370
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
433
371
{ .name = NULL }
434
372
};
435
373
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
376
switch (key) {
442
377
case 'g': /* --global-options */
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
378
if (arg != NULL){
379
char *p;
380
while((p = strsep(&arg, ",")) != NULL){
381
if(p[0] == '\0'){
382
continue;
383
}
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
return ARGP_ERR_UNKNOWN;
448
387
}
449
388
}
450
errno = 0;
451
389
}
452
390
break;
453
391
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
456
397
}
457
398
break;
458
399
case 'o': /* --options-for */
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
477
}
478
}
479
errno = 0;
400
if (arg != NULL){
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
403
break;
404
}
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
407
break;
408
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
417
}
418
}
480
419
}
481
420
break;
482
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
483
425
{
484
426
char *envdef = strchr(arg, ':');
485
427
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
428
break;
489
429
}
490
430
*envdef = '\0';
491
envdef++;
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
499
433
}
500
434
}
501
435
break;
502
436
case 'd': /* --disable */
503
{
437
if (arg != NULL){
504
438
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
508
441
}
442
p->disabled = true;
509
443
}
510
444
break;
511
445
case 'e': /* --enable */
512
{
446
if (arg != NULL){
513
447
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
517
450
}
451
p->disabled = false;
518
452
}
519
453
break;
520
454
case 128: /* --plugin-dir */
521
455
free(plugindir);
522
456
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
457
if(plugindir == NULL){
458
perror("strdup");
459
}
526
460
break;
527
461
case 129: /* --config-file */
528
462
/* This is already done by parse_opt_config_file() */
529
463
break;
530
464
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
465
uid = (uid_t)strtol(arg, NULL, 10);
540
466
break;
541
467
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
468
gid = (gid_t)strtol(arg, NULL, 10);
551
469
break;
552
470
case 132: /* --debug */
553
471
debug = true;
554
472
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
582
473
case ARGP_KEY_ARG:
583
474
/* Cryptsetup always passes an argument, which is an empty
584
475
string if "none" was specified in /etc/crypttab. So if
585
476
argument was empty, we ignore it silently. */
586
if(arg[0] == '\0'){
587
break;
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
588
479
}
589
/* FALLTHROUGH */
480
break;
481
case ARGP_KEY_END:
482
break;
590
483
default:
591
484
return ARGP_ERR_UNKNOWN;
592
485
}
593
return errno; /* Set to 0 at start */
486
return 0;
594
487
}
595
488
596
489
/* This option parser is the same as parse_opt() above, except it
597
490
ignores everything but the --config-file option. */
598
error_t parse_opt_config_file(int key, char *arg,
599
__attribute__((unused))
600
struct argp_state *state){
601
errno = 0;
602
switch(key){
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
603
495
case 'g': /* --global-options */
604
496
case 'G': /* --global-env */
605
497
case 'o': /* --options-for */
611
503
case 129: /* --config-file */
612
504
free(argfile);
613
505
argfile = strdup(arg);
614
if(argfile != NULL){
615
errno = 0;
506
if(argfile == NULL){
507
perror("strdup");
616
508
}
617
break;
509
break;
618
510
case 130: /* --userid */
619
511
case 131: /* --groupid */
620
512
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
622
case '?': /* --help */
623
case -3: /* --usage */
624
case 'V': /* --version */
625
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
626
515
break;
627
516
default:
628
517
return ARGP_ERR_UNKNOWN;
629
518
}
630
return errno;
519
return 0;
631
520
}
632
521
633
522
struct argp argp = { .options = options,
635
524
.args_doc = "",
636
525
.doc = "Mandos plugin runner -- Run plugins" };
637
526
638
/* Parse using parse_opt_config_file() in order to get the custom
527
/* Parse using the parse_opt_config_file in order to get the custom
639
528
config file location, if any. */
640
ret = argp_parse(&argp, argc, argv,
641
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
642
NULL, NULL);
643
switch(ret){
644
case 0:
645
break;
646
case ENOMEM:
647
default:
648
errno = ret;
649
error(0, errno, "argp_parse");
650
exitstatus = EX_OSERR;
651
goto fallback;
652
case EINVAL:
653
exitstatus = EX_USAGE;
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
532
exitstatus = EXIT_FAILURE;
654
533
goto fallback;
655
534
}
656
535
658
537
argp.parser = parse_opt;
659
538
660
539
/* Open the configfile if available */
661
if(argfile == NULL){
540
if (argfile == NULL){
662
541
conffp = fopen(AFILE, "r");
663
542
} else {
664
543
conffp = fopen(argfile, "r");
665
}
544
}
666
545
if(conffp != NULL){
667
546
char *org_line = NULL;
668
547
char *p, *arg, *new_arg, *line;
669
548
size_t size = 0;
549
ssize_t sret;
670
550
const char whitespace_delims[] = " \r\t\f\v\n";
671
551
const char comment_delim[] = "#";
672
552
673
553
custom_argc = 1;
674
554
custom_argv = malloc(sizeof(char*) * 2);
675
555
if(custom_argv == NULL){
676
error(0, errno, "malloc");
677
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
678
558
goto fallback;
679
559
}
680
560
custom_argv[0] = argv[0];
681
561
custom_argv[1] = NULL;
682
562
683
563
/* for each line in the config file, strip whitespace and ignore
684
564
commented text */
685
565
while(true){
687
567
if(sret == -1){
688
568
break;
689
569
}
690
570
691
571
line = org_line;
692
572
arg = strsep(&line, comment_delim);
693
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
696
576
}
697
577
new_arg = strdup(p);
698
578
if(new_arg == NULL){
699
error(0, errno, "strdup");
700
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
701
581
free(org_line);
702
582
goto fallback;
703
583
}
704
584
705
585
custom_argc += 1;
706
{
707
char **new_argv = realloc(custom_argv, sizeof(char *)
708
* ((size_t)custom_argc + 1));
709
if(new_argv == NULL){
710
error(0, errno, "realloc");
711
exitstatus = EX_OSERR;
712
free(new_arg);
713
free(org_line);
714
goto fallback;
715
} else {
716
custom_argv = new_argv;
717
}
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
718
593
}
719
594
custom_argv[custom_argc-1] = new_arg;
720
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
721
596
}
722
597
}
723
do {
724
ret = fclose(conffp);
725
} while(ret == EOF and errno == EINTR);
726
if(ret == EOF){
727
error(0, errno, "fclose");
728
exitstatus = EX_IOERR;
729
goto fallback;
730
}
731
598
free(org_line);
732
599
} else {
733
600
/* Check for harmful errors and go to fallback. Other errors might
734
601
not affect opening plugins */
735
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
736
error(0, errno, "fopen");
737
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
738
605
goto fallback;
739
606
}
740
607
}
741
/* If there were any arguments from the configuration file, pass
742
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
743
610
if(custom_argv != NULL){
744
ret = argp_parse(&argp, custom_argc, custom_argv,
745
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
746
NULL, NULL);
747
switch(ret){
748
case 0:
749
break;
750
case ENOMEM:
751
default:
752
errno = ret;
753
error(0, errno, "argp_parse");
754
exitstatus = EX_OSERR;
755
goto fallback;
756
case EINVAL:
757
exitstatus = EX_CONFIG;
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
758
616
goto fallback;
759
617
}
760
618
}
761
619
762
620
/* Parse actual command line arguments, to let them override the
763
621
config file */
764
ret = argp_parse(&argp, argc, argv,
765
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
766
NULL, NULL);
767
switch(ret){
768
case 0:
769
break;
770
case ENOMEM:
771
default:
772
errno = ret;
773
error(0, errno, "argp_parse");
774
exitstatus = EX_OSERR;
775
goto fallback;
776
case EINVAL:
777
exitstatus = EX_USAGE;
778
goto fallback;
779
}
780
781
{
782
char *pluginhelperenv;
783
bool bret = true;
784
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
785
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
786
if(ret != -1){
787
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
788
}
789
if(ret == -1 or not bret){
790
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
791
" environment variable to \"%s\" for all plugins\n",
792
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
793
}
794
if(ret != -1){
795
free(pluginhelperenv);
796
}
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
797
627
}
798
628
799
629
if(debug){
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
801
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
802
632
p->name ? p->name : "Global", p->argc - 1);
803
633
for(char **a = p->argv; *a != NULL; a++){
804
634
fprintf(stderr, "\tArg: %s\n", *a);
805
635
}
806
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
807
637
for(char **a = p->environ; *a != NULL; a++){
808
638
fprintf(stderr, "\t%s\n", *a);
809
639
}
810
640
}
811
641
}
812
642
813
if(getuid() == 0){
814
/* Work around Debian bug #633582:
815
<https://bugs.debian.org/633582> */
816
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
817
if(plugindir_fd == -1){
818
if(errno != ENOENT){
819
error(0, errno, "open(\"" PDIR "\")");
820
}
821
} else {
822
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
823
if(ret == -1){
824
error(0, errno, "fstat");
825
} else {
826
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
827
ret = fchown(plugindir_fd, uid, gid);
828
if(ret == -1){
829
error(0, errno, "fchown");
830
}
831
}
832
}
833
close(plugindir_fd);
834
}
835
}
836
837
/* Lower permissions */
838
ret = setgid(gid);
839
if(ret == -1){
840
error(0, errno, "setgid");
841
}
643
/* Strip permissions down to nobody */
842
644
ret = setuid(uid);
843
if(ret == -1){
844
error(0, errno, "setuid");
845
}
846
847
/* Open plugin directory with close_on_exec flag */
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
848
666
{
849
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
850
#ifdef O_CLOEXEC
851
O_CLOEXEC
852
#else /* not O_CLOEXEC */
853
0
854
#endif /* not O_CLOEXEC */
855
);
856
if(dir_fd == -1){
857
error(0, errno, "Could not open plugin dir");
858
exitstatus = EX_UNAVAILABLE;
859
goto fallback;
860
}
861
862
#ifndef O_CLOEXEC
863
/* Set the FD_CLOEXEC flag on the directory */
864
ret = set_cloexec_flag(dir_fd);
865
if(ret < 0){
866
error(0, errno, "set_cloexec_flag");
867
exitstatus = EX_OSERR;
868
goto fallback;
869
}
870
#endif /* O_CLOEXEC */
871
}
872
873
int good_name(const struct dirent * const dirent){
874
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
875
"*.dpkg-old", "*.dpkg-bak",
876
"*.dpkg-divert", NULL };
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pat = (const char **)patterns;
882
*pat != NULL; pat++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
886
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
887
!= FNM_NOMATCH){
888
if(debug){
889
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
890
" matching pattern %s\n", dirent->d_name, *pat);
891
}
892
return 0;
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
893
674
}
894
675
}
895
return 1;
896
}
897
898
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
alphasort);
900
if(numplugins == -1){
901
error(0, errno, "Could not scan plugin dir");
902
direntries = NULL;
903
exitstatus = EX_OSERR;
904
goto fallback;
905
676
}
906
677
907
678
FD_ZERO(&rfds_all);
908
679
909
680
/* Read and execute any executable in the plugin directory*/
910
for(int i = 0; i < numplugins; i++){
911
912
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
913
if(plugin_fd == -1){
914
error(0, errno, "Could not open plugin");
915
free(direntries[i]);
916
continue;
917
}
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
919
if(ret == -1){
920
error(0, errno, "stat");
921
close(plugin_fd);
922
free(direntries[i]);
923
continue;
924
}
925
681
while(true){
682
dirst = readdir(dir);
683
684
/* All directory entries have been processed */
685
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
691
break;
692
}
693
694
d_name_len = strlen(dirst->d_name);
695
696
/* Ignore dotfiles, backup files and other junk */
697
{
698
bool bad_name = false;
699
700
const char const *bad_prefixes[] = { ".", "#", NULL };
701
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-old",
704
".dpkg-bak",
705
".dpkg-divert", NULL };
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
size_t pre_len = strlen(*pre);
708
if((d_name_len >= pre_len)
709
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
if(debug){
711
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
712
" with bad prefix %s\n", dirst->d_name, *pre);
713
}
714
bad_name = true;
715
break;
716
}
717
}
718
if(bad_name){
719
continue;
720
}
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
size_t suf_len = strlen(*suf);
723
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
== 0)){
726
if(debug){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad suffix %s\n", dirst->d_name, *suf);
729
}
730
bad_name = true;
731
break;
732
}
733
}
734
735
if(bad_name){
736
continue;
737
}
738
}
739
740
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
746
if(ret < 0){
747
perror("asprintf");
748
continue;
749
}
750
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
926
758
/* Ignore non-executable files */
927
if(not S_ISREG(st.st_mode)
928
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
929
X_OK, 0)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
930
760
if(debug){
931
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
932
" with bad type or mode\n",
933
plugindir != NULL ? plugindir : PDIR,
934
direntries[i]->d_name);
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
935
763
}
936
close(plugin_fd);
937
free(direntries[i]);
764
free(filename);
938
765
continue;
939
766
}
940
767
941
plugin *p = getplugin(direntries[i]->d_name);
768
plugin *p = getplugin(dirst->d_name);
942
769
if(p == NULL){
943
error(0, errno, "getplugin");
944
close(plugin_fd);
945
free(direntries[i]);
770
perror("getplugin");
771
free(filename);
946
772
continue;
947
773
}
948
774
if(p->disabled){
949
775
if(debug){
950
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
951
direntries[i]->d_name);
777
dirst->d_name);
952
778
}
953
close(plugin_fd);
954
free(direntries[i]);
779
free(filename);
955
780
continue;
956
781
}
957
782
{
960
785
if(g != NULL){
961
786
for(char **a = g->argv + 1; *a != NULL; a++){
962
787
if(not add_argument(p, *a)){
963
error(0, errno, "add_argument");
788
perror("add_argument");
964
789
}
965
790
}
966
791
/* Add global environment variables */
967
792
for(char **e = g->environ; *e != NULL; e++){
968
793
if(not add_environment(p, *e, false)){
969
error(0, errno, "add_environment");
794
perror("add_environment");
970
795
}
971
796
}
972
797
}
973
798
}
974
/* If this plugin has any environment variables, we need to
975
duplicate the environment from this process, too. */
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
976
802
if(p->environ[0] != NULL){
977
803
for(char **e = environ; *e != NULL; e++){
978
804
if(not add_environment(p, *e, false)){
979
error(0, errno, "add_environment");
805
perror("add_environment");
980
806
}
981
807
}
982
808
}
983
809
984
810
int pipefd[2];
985
#ifndef O_CLOEXEC
986
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
987
#else /* O_CLOEXEC */
988
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
989
#endif /* O_CLOEXEC */
990
if(ret == -1){
991
error(0, errno, "pipe");
992
exitstatus = EX_OSERR;
993
free(direntries[i]);
994
goto fallback;
995
}
996
if(pipefd[0] >= FD_SETSIZE){
997
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
998
FD_SETSIZE);
999
close(pipefd[0]);
1000
close(pipefd[1]);
1001
exitstatus = EX_OSERR;
1002
free(direntries[i]);
1003
goto fallback;
1004
}
1005
#ifndef O_CLOEXEC
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
1006
817
/* Ask OS to automatic close the pipe on exec */
1007
818
ret = set_cloexec_flag(pipefd[0]);
1008
819
if(ret < 0){
1009
error(0, errno, "set_cloexec_flag");
1010
close(pipefd[0]);
1011
close(pipefd[1]);
1012
exitstatus = EX_OSERR;
1013
free(direntries[i]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
1014
822
goto fallback;
1015
823
}
1016
824
ret = set_cloexec_flag(pipefd[1]);
1017
825
if(ret < 0){
1018
error(0, errno, "set_cloexec_flag");
1019
close(pipefd[0]);
1020
close(pipefd[1]);
1021
exitstatus = EX_OSERR;
1022
free(direntries[i]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1023
828
goto fallback;
1024
829
}
1025
#endif /* not O_CLOEXEC */
1026
830
/* Block SIGCHLD until process is safely in process list */
1027
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1028
&sigchld_action.sa_mask,
1029
NULL));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1030
832
if(ret < 0){
1031
error(0, errno, "sigprocmask");
1032
exitstatus = EX_OSERR;
1033
free(direntries[i]);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1034
835
goto fallback;
1035
836
}
1036
837
/* Starting a new process to be watched */
1037
pid_t pid;
1038
do {
1039
pid = fork();
1040
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
1041
839
if(pid == -1){
1042
error(0, errno, "fork");
1043
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1044
&sigchld_action.sa_mask, NULL));
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1049
842
goto fallback;
1050
843
}
1051
844
if(pid == 0){
1052
845
/* this is the child process */
1053
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1054
847
if(ret < 0){
1055
error(0, errno, "sigaction");
1056
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1057
850
}
1058
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
852
if(ret < 0){
1060
error(0, errno, "sigprocmask");
1061
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1062
855
}
1063
856
1064
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1065
858
if(ret == -1){
1066
error(0, errno, "dup2");
1067
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1068
861
}
1069
862
1070
if(fexecve(plugin_fd, p->argv,
1071
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1072
error(0, errno, "fexecve for %s/%s",
1073
plugindir != NULL ? plugindir : PDIR,
1074
direntries[i]->d_name);
1075
_exit(EX_OSERR);
863
if(dirfd(dir) < 0){
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
866
closedir(dir);
867
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
1076
878
}
1077
879
/* no return */
1078
880
}
1079
881
/* Parent process */
1080
882
close(pipefd[1]); /* Close unused write end of pipe */
1081
close(plugin_fd);
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
1083
if(new_plugin == NULL){
1084
error(0, errno, "getplugin");
1085
ret = (int)(TEMP_FAILURE_RETRY
1086
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1087
NULL)));
883
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1088
888
if(ret < 0){
1089
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1090
890
}
1091
exitstatus = EX_OSERR;
1092
free(direntries[i]);
891
exitstatus = EXIT_FAILURE;
1093
892
goto fallback;
1094
893
}
1095
free(direntries[i]);
1096
894
1097
895
new_plugin->pid = pid;
1098
896
new_plugin->fd = pipefd[0];
1099
1100
if(debug){
1101
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1102
new_plugin->name, (intmax_t) (new_plugin->pid));
1103
}
1104
897
1105
898
/* Unblock SIGCHLD so signal handler can be run if this process
1106
899
has already completed */
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
1109
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
901
if(ret < 0){
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1113
904
goto fallback;
1114
905
}
1115
906
1116
907
FD_SET(new_plugin->fd, &rfds_all);
1117
908
1118
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1119
910
maxfd = new_plugin->fd;
1120
911
}
1121
912
}
1122
913
1123
free(direntries);
1124
direntries = NULL;
1125
close(dir_fd);
1126
dir_fd = -1;
1127
free_plugin(getplugin(NULL));
914
closedir(dir);
915
dir = NULL;
1128
916
1129
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1130
918
if(p->pid != 0){
1141
929
while(plugin_list){
1142
930
fd_set rfds = rfds_all;
1143
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1144
if(select_ret == -1 and errno != EINTR){
1145
error(0, errno, "select");
1146
exitstatus = EX_OSERR;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1147
935
goto fallback;
1148
936
}
1149
937
/* OK, now either a process completed, or something can be read
1150
938
from one of them */
1151
939
for(plugin *proc = plugin_list; proc != NULL;){
1152
940
/* Is this process completely done? */
1153
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1154
942
/* Only accept the plugin output if it exited cleanly */
1155
943
if(not WIFEXITED(proc->status)
1156
944
or WEXITSTATUS(proc->status) != 0){
1157
945
/* Bad exit by plugin */
1158
946
1159
947
if(debug){
1160
948
if(WIFEXITED(proc->status)){
1161
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1162
" status %d\n", proc->name,
1163
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1164
951
WEXITSTATUS(proc->status));
1165
} else if(WIFSIGNALED(proc->status)){
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1167
" signal %d: %s\n", proc->name,
1168
(intmax_t) (proc->pid),
1169
WTERMSIG(proc->status),
1170
strsignal(WTERMSIG(proc->status)));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
956
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1171
959
}
1172
960
}
1173
961
1174
962
/* Remove the plugin */
1175
963
FD_CLR(proc->fd, &rfds_all);
1176
964
1177
965
/* Block signal while modifying process_list */
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
967
if(ret < 0){
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1185
970
goto fallback;
1186
971
}
1187
972
1190
975
proc = next_plugin;
1191
976
1192
977
/* We are done modifying process list, so unblock signal */
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1196
980
if(ret < 0){
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1199
983
goto fallback;
1200
984
}
1201
985
1211
995
bool bret = print_out_password(proc->buffer,
1212
996
proc->buffer_length);
1213
997
if(not bret){
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1216
1000
}
1217
1001
goto fallback;
1218
1002
}
1225
1009
}
1226
1010
/* Before reading, make the process' data buffer large enough */
1227
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1228
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1229
+ (size_t) BUFFER_SIZE);
1230
if(new_buffer == NULL){
1231
error(0, errno, "malloc");
1232
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1233
1017
goto fallback;
1234
1018
}
1235
proc->buffer = new_buffer;
1236
1019
proc->buffer_size += BUFFER_SIZE;
1237
1020
}
1238
1021
/* Read from the process */
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
proc->buffer
1241
+ proc->buffer_length,
1242
BUFFER_SIZE));
1243
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1244
1025
/* Read error from this process; ignore the error */
1245
1026
proc = proc->next;
1246
1027
continue;
1247
1028
}
1248
if(sret == 0){
1029
if(ret == 0){
1249
1030
/* got EOF */
1250
1031
proc->eof = true;
1251
1032
} else {
1252
proc->buffer_length += (size_t) sret;
1033
proc->buffer_length += (size_t) ret;
1253
1034
}
1254
1035
}
1255
1036
}
1256
1257
1037
1038
1258
1039
fallback:
1259
1040
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1262
1042
/* Fallback if all plugins failed, none are found or an error
1263
1043
occured */
1264
1044
bool bret;
1272
1052
}
1273
1053
bret = print_out_password(passwordbuffer, len);
1274
1054
if(not bret){
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1277
1057
}
1278
1058
}
1279
1059
1280
1060
/* Restore old signal handler */
1281
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1282
1062
if(ret == -1){
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1285
1065
}
1286
1066
1287
1067
if(custom_argv != NULL){
1291
1071
free(custom_argv);
1292
1072
}
1293
1073
1294
free(direntries);
1295
1296
if(dir_fd != -1){
1297
close(dir_fd);
1074
if(dir != NULL){
1075
closedir(dir);
1298
1076
}
1299
1077
1300
1078
/* Kill the processes */
1304
1082
ret = kill(p->pid, SIGTERM);
1305
1083
if(ret == -1 and errno != ESRCH){
1306
1084
/* Set-uid proccesses might not get closed */
1307
error(0, errno, "kill");
1085
perror("kill");
1308
1086
}
1309
1087
}
1310
1088
}
1311
1089
1312
1090
/* Wait for any remaining child processes to terminate */
1313
do {
1091
do{
1314
1092
ret = wait(NULL);
1315
1093
} while(ret >= 0);
1316
1094
if(errno != ECHILD){
1317
error(0, errno, "wait");
1095
perror("wait");
1318
1096
}
1319
1097
1320
1098
free_plugin_list();
1321
1099
1322
1100
free(plugindir);
1323
free(pluginhelperdir);
1324
1101
free(argfile);
1325
1102
1326
1103
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0