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- Committer: Teddy Hogeborn
- Date: 2008-09-06 17:24:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906172458-2x5wlfkn7oqckt1y
* legalnotice.xml: Copy DocBook 4.4-formatted text from
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
- 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 © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 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
free(plugin_node->name);
317
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
318
272
free(*arg);
319
273
}
323
277
}
324
278
free(plugin_node->environ);
325
279
free(plugin_node->buffer);
326
280
327
281
/* Removes the plugin from the singly-linked list */
328
282
if(plugin_node == plugin_list){
329
283
/* First one - simple */
349
303
350
304
int main(int argc, char *argv[]){
351
305
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
306
char *argfile = NULL;
354
307
FILE *conffp;
355
struct dirent **direntries = NULL;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
356
311
struct stat st;
357
312
fd_set rfds_all;
358
313
int ret, maxfd = 0;
359
ssize_t sret;
360
314
uid_t uid = 65534;
361
315
gid_t gid = 65534;
362
316
bool debug = false;
366
320
.sa_flags = SA_NOCLDSTOP };
367
321
char **custom_argv = NULL;
368
322
int custom_argc = 0;
369
int dir_fd = -1;
370
323
371
324
/* Establish a signal handler */
372
325
sigemptyset(&sigchld_action.sa_mask);
373
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
327
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
377
330
goto fallback;
378
331
}
379
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
333
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
383
336
goto fallback;
384
337
}
385
338
417
370
.doc = "Group ID the plugins will run as", .group = 3 },
418
371
{ .name = "debug", .key = 132,
419
372
.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
373
{ .name = NULL }
434
374
};
435
375
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
442
379
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;
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;
448
389
}
449
390
}
450
errno = 0;
451
391
}
452
392
break;
453
393
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
456
405
}
457
406
break;
458
407
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;
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
425
}
426
}
480
427
}
481
428
break;
482
429
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
483
433
{
484
434
char *envdef = strchr(arg, ':');
485
435
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
491
442
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;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
499
445
}
500
446
}
501
447
break;
502
448
case 'd': /* --disable */
503
{
449
if (arg != NULL){
504
450
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
508
453
}
454
p->disabled = true;
509
455
}
510
456
break;
511
457
case 'e': /* --enable */
512
{
458
if (arg != NULL){
513
459
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
517
462
}
463
p->disabled = false;
518
464
}
519
465
break;
520
466
case 128: /* --plugin-dir */
521
free(plugindir);
522
467
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
468
if(plugindir == NULL){
469
perror("strdup");
470
}
526
471
break;
527
472
case 129: /* --config-file */
528
473
/* This is already done by parse_opt_config_file() */
529
474
break;
530
475
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;
476
uid = (uid_t)strtol(arg, NULL, 10);
540
477
break;
541
478
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;
479
gid = (gid_t)strtol(arg, NULL, 10);
551
480
break;
552
481
case 132: /* --debug */
553
482
debug = true;
554
483
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
case -3: /* --usage */
569
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
570
argp_state_help(state, state->out_stream,
571
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
case 'V': /* --version */
573
fprintf(state->out_stream, "%s\n", argp_program_version);
574
exit(EXIT_SUCCESS);
575
break;
576
/*
577
* When adding more options before this line, remember to also add a
578
* "case" to the "parse_opt_config_file" function below.
579
*/
580
484
case ARGP_KEY_ARG:
581
/* Cryptsetup always passes an argument, which is an empty
582
string if "none" was specified in /etc/crypttab. So if
583
argument was empty, we ignore it silently. */
584
if(arg[0] == '\0'){
585
break;
586
}
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
587
489
default:
588
490
return ARGP_ERR_UNKNOWN;
589
491
}
590
return errno; /* Set to 0 at start */
492
return 0;
591
493
}
592
494
593
495
/* This option parser is the same as parse_opt() above, except it
594
496
ignores everything but the --config-file option. */
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
600
501
case 'g': /* --global-options */
601
502
case 'G': /* --global-env */
602
503
case 'o': /* --options-for */
606
507
case 128: /* --plugin-dir */
607
508
break;
608
509
case 129: /* --config-file */
609
free(argfile);
610
510
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
511
if(argfile == NULL){
512
perror("strdup");
613
513
}
614
break;
514
break;
615
515
case 130: /* --userid */
616
516
case 131: /* --groupid */
617
517
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
622
518
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
623
520
break;
624
521
default:
625
522
return ARGP_ERR_UNKNOWN;
626
523
}
627
return errno;
524
return 0;
628
525
}
629
526
630
527
struct argp argp = { .options = options,
632
529
.args_doc = "",
633
530
.doc = "Mandos plugin runner -- Run plugins" };
634
531
635
/* Parse using parse_opt_config_file() in order to get the custom
532
/* Parse using the parse_opt_config_file in order to get the custom
636
533
config file location, if any. */
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
639
NULL, NULL);
640
switch(ret){
641
case 0:
642
break;
643
case ENOMEM:
644
default:
645
errno = ret;
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
648
goto fallback;
649
case EINVAL:
650
exitstatus = EX_USAGE;
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
536
fprintf(stderr, "Unknown error while parsing arguments\n");
537
exitstatus = EXIT_FAILURE;
651
538
goto fallback;
652
539
}
653
540
655
542
argp.parser = parse_opt;
656
543
657
544
/* Open the configfile if available */
658
if(argfile == NULL){
545
if (argfile == NULL){
659
546
conffp = fopen(AFILE, "r");
660
547
} else {
661
548
conffp = fopen(argfile, "r");
662
}
549
}
663
550
if(conffp != NULL){
664
551
char *org_line = NULL;
665
552
char *p, *arg, *new_arg, *line;
666
553
size_t size = 0;
554
ssize_t sret;
667
555
const char whitespace_delims[] = " \r\t\f\v\n";
668
556
const char comment_delim[] = "#";
669
557
670
558
custom_argc = 1;
671
559
custom_argv = malloc(sizeof(char*) * 2);
672
560
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
561
perror("malloc");
562
exitstatus = EXIT_FAILURE;
675
563
goto fallback;
676
564
}
677
565
custom_argv[0] = argv[0];
678
566
custom_argv[1] = NULL;
679
567
680
568
/* for each line in the config file, strip whitespace and ignore
681
569
commented text */
682
570
while(true){
684
572
if(sret == -1){
685
573
break;
686
574
}
687
575
688
576
line = org_line;
689
577
arg = strsep(&line, comment_delim);
690
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
693
581
}
694
582
new_arg = strdup(p);
695
583
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
698
586
free(org_line);
699
587
goto fallback;
700
588
}
701
589
702
590
custom_argc += 1;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
596
free(org_line);
597
goto fallback;
715
598
}
716
599
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
600
custom_argv[custom_argc] = NULL;
718
601
}
719
602
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
728
603
free(org_line);
729
604
} else {
730
605
/* Check for harmful errors and go to fallback. Other errors might
731
606
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
perror("fopen");
609
exitstatus = EXIT_FAILURE;
735
610
goto fallback;
736
611
}
737
612
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
740
615
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
618
if (ret == ARGP_ERR_UNKNOWN){
619
fprintf(stderr, "Unknown error while parsing arguments\n");
620
exitstatus = EXIT_FAILURE;
755
621
goto fallback;
756
622
}
757
623
}
758
624
759
625
/* Parse actual command line arguments, to let them override the
760
626
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
793
}
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
794
632
}
795
633
796
634
if(debug){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
635
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
636
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
637
p->name ? p->name : "Global", p->argc - 1);
800
638
for(char **a = p->argv; *a != NULL; a++){
801
639
fprintf(stderr, "\tArg: %s\n", *a);
802
640
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
642
for(char **a = p->environ; *a != NULL; a++){
805
643
fprintf(stderr, "\t%s\n", *a);
806
644
}
807
645
}
808
646
}
809
647
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
648
/* Strip permissions down to nobody */
839
649
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
650
if (ret == -1){
651
perror("setuid");
652
}
653
setgid(gid);
654
if (ret == -1){
655
perror("setgid");
656
}
657
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
664
if(dir == NULL){
665
perror("Could not open plugin dir");
666
exitstatus = EXIT_FAILURE;
667
goto fallback;
668
}
669
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
671
{
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
672
int dir_fd = dirfd(dir);
673
if(dir_fd >= 0){
674
ret = set_cloexec_flag(dir_fd);
675
if(ret < 0){
676
perror("set_cloexec_flag");
677
exitstatus = EXIT_FAILURE;
678
goto fallback;
890
679
}
891
680
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
902
681
}
903
682
904
683
FD_ZERO(&rfds_all);
905
684
906
685
/* Read and execute any executable in the plugin directory*/
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
913
continue;
914
}
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
if(ret == -1){
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
920
continue;
921
}
922
686
while(true){
687
dirst = readdir(dir);
688
689
/* All directory entries have been processed */
690
if(dirst == NULL){
691
if (errno == EBADF){
692
perror("readdir");
693
exitstatus = EXIT_FAILURE;
694
goto fallback;
695
}
696
break;
697
}
698
699
d_name_len = strlen(dirst->d_name);
700
701
/* Ignore dotfiles, backup files and other junk */
702
{
703
bool bad_name = false;
704
705
const char const *bad_prefixes[] = { ".", "#", NULL };
706
707
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
708
".dpkg-old",
709
".dpkg-divert", NULL };
710
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
size_t pre_len = strlen(*pre);
712
if((d_name_len >= pre_len)
713
and strncmp((dirst->d_name), *pre, pre_len) == 0){
714
if(debug){
715
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
716
" with bad prefix %s\n", dirst->d_name, *pre);
717
}
718
bad_name = true;
719
break;
720
}
721
}
722
if(bad_name){
723
continue;
724
}
725
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
size_t suf_len = strlen(*suf);
727
if((d_name_len >= suf_len)
728
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
729
== 0)){
730
if(debug){
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad suffix %s\n", dirst->d_name, *suf);
733
}
734
bad_name = true;
735
break;
736
}
737
}
738
739
if(bad_name){
740
continue;
741
}
742
}
743
744
char *filename;
745
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
747
} else {
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
}
750
if(ret < 0){
751
perror("asprintf");
752
continue;
753
}
754
755
ret = stat(filename, &st);
756
if (ret == -1){
757
perror("stat");
758
free(filename);
759
continue;
760
}
761
923
762
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
764
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
765
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
766
" with bad type or mode\n", filename);
932
767
}
933
close(plugin_fd);
934
free(direntries[i]);
768
free(filename);
935
769
continue;
936
770
}
937
771
938
plugin *p = getplugin(direntries[i]->d_name);
772
plugin *p = getplugin(dirst->d_name);
939
773
if(p == NULL){
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
774
perror("getplugin");
775
free(filename);
943
776
continue;
944
777
}
945
778
if(p->disabled){
946
779
if(debug){
947
780
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
781
dirst->d_name);
949
782
}
950
close(plugin_fd);
951
free(direntries[i]);
783
free(filename);
952
784
continue;
953
785
}
954
786
{
957
789
if(g != NULL){
958
790
for(char **a = g->argv + 1; *a != NULL; a++){
959
791
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
792
perror("add_argument");
961
793
}
962
794
}
963
795
/* Add global environment variables */
964
796
for(char **e = g->environ; *e != NULL; e++){
965
797
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
798
perror("add_environment");
967
799
}
968
800
}
969
801
}
970
802
}
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
803
/* If this plugin has any environment variables, we will call
804
using execve and need to duplicate the environment from this
805
process, too. */
973
806
if(p->environ[0] != NULL){
974
807
for(char **e = environ; *e != NULL; e++){
975
808
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
809
perror("add_environment");
977
810
}
978
811
}
979
812
}
980
813
981
814
int pipefd[2];
982
#ifndef O_CLOEXEC
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
987
if(ret == -1){
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
815
ret = pipe(pipefd);
816
if (ret == -1){
817
perror("pipe");
818
exitstatus = EXIT_FAILURE;
819
goto fallback;
820
}
1003
821
/* Ask OS to automatic close the pipe on exec */
1004
822
ret = set_cloexec_flag(pipefd[0]);
1005
823
if(ret < 0){
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
1011
826
goto fallback;
1012
827
}
1013
828
ret = set_cloexec_flag(pipefd[1]);
1014
829
if(ret < 0){
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
830
perror("set_cloexec_flag");
831
exitstatus = EXIT_FAILURE;
1020
832
goto fallback;
1021
833
}
1022
#endif /* not O_CLOEXEC */
1023
834
/* Block SIGCHLD until process is safely in process list */
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1026
NULL));
835
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1027
836
if(ret < 0){
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
837
perror("sigprocmask");
838
exitstatus = EXIT_FAILURE;
1031
839
goto fallback;
1032
840
}
1033
841
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
842
pid_t pid = fork();
1038
843
if(pid == -1){
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
844
perror("fork");
845
exitstatus = EXIT_FAILURE;
1046
846
goto fallback;
1047
847
}
1048
848
if(pid == 0){
1049
849
/* this is the child process */
1050
850
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
851
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
852
perror("sigaction");
853
_exit(EXIT_FAILURE);
1054
854
}
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
856
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
857
perror("sigprocmask");
858
_exit(EXIT_FAILURE);
1059
859
}
1060
860
1061
861
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
862
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
863
perror("dup2");
864
_exit(EXIT_FAILURE);
1065
865
}
1066
866
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
867
if(dirfd(dir) < 0){
868
/* If dir has no file descriptor, we could not set FD_CLOEXEC
869
above and must now close it manually here. */
870
closedir(dir);
871
}
872
if(p->environ[0] == NULL){
873
if(execv(filename, p->argv) < 0){
874
perror("execv");
875
_exit(EXIT_FAILURE);
876
}
877
} else {
878
if(execve(filename, p->argv, p->environ) < 0){
879
perror("execve");
880
_exit(EXIT_FAILURE);
881
}
1073
882
}
1074
883
/* no return */
1075
884
}
1076
885
/* Parent process */
1077
886
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1084
NULL)));
887
free(filename);
888
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
890
perror("getplugin");
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
892
if(ret < 0){
1086
error(0, errno, "sigprocmask");
893
perror("sigprocmask");
1087
894
}
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
895
exitstatus = EXIT_FAILURE;
1090
896
goto fallback;
1091
897
}
1092
free(direntries[i]);
1093
898
1094
899
new_plugin->pid = pid;
1095
900
new_plugin->fd = pipefd[0];
1096
901
1097
902
/* Unblock SIGCHLD so signal handler can be run if this process
1098
903
has already completed */
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
1101
NULL));
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1102
905
if(ret < 0){
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
906
perror("sigprocmask");
907
exitstatus = EXIT_FAILURE;
1105
908
goto fallback;
1106
909
}
1107
910
1108
911
FD_SET(new_plugin->fd, &rfds_all);
1109
912
1110
if(maxfd < new_plugin->fd){
913
if (maxfd < new_plugin->fd){
1111
914
maxfd = new_plugin->fd;
1112
915
}
916
1113
917
}
1114
918
1115
free(direntries);
1116
direntries = NULL;
1117
close(dir_fd);
1118
dir_fd = -1;
1119
free_plugin(getplugin(NULL));
1120
919
closedir(dir);
920
dir = NULL;
921
1121
922
for(plugin *p = plugin_list; p != NULL; p = p->next){
1122
923
if(p->pid != 0){
1123
924
break;
1128
929
free_plugin_list();
1129
930
}
1130
931
}
1131
932
1132
933
/* Main loop while running plugins exist */
1133
934
while(plugin_list){
1134
935
fd_set rfds = rfds_all;
1135
936
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1136
if(select_ret == -1 and errno != EINTR){
1137
error(0, errno, "select");
1138
exitstatus = EX_OSERR;
937
if (select_ret == -1){
938
perror("select");
939
exitstatus = EXIT_FAILURE;
1139
940
goto fallback;
1140
941
}
1141
942
/* OK, now either a process completed, or something can be read
1142
943
from one of them */
1143
for(plugin *proc = plugin_list; proc != NULL;){
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1144
945
/* Is this process completely done? */
1145
if(proc->completed and proc->eof){
946
if(proc->eof and proc->completed){
1146
947
/* Only accept the plugin output if it exited cleanly */
1147
948
if(not WIFEXITED(proc->status)
1148
949
or WEXITSTATUS(proc->status) != 0){
1149
950
/* Bad exit by plugin */
1150
951
1151
952
if(debug){
1152
953
if(WIFEXITED(proc->status)){
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1156
956
WEXITSTATUS(proc->status));
1157
} else if(WIFSIGNALED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1159
" signal %d: %s\n", proc->name,
1160
(intmax_t) (proc->pid),
1161
WTERMSIG(proc->status),
1162
strsignal(WTERMSIG(proc->status)));
957
} else if(WIFSIGNALED(proc->status)) {
958
fprintf(stderr, "Plugin %u killed by signal %d\n",
959
(unsigned int) (proc->pid),
960
WTERMSIG(proc->status));
961
} else if(WCOREDUMP(proc->status)){
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1163
964
}
1164
965
}
1165
966
1166
967
/* Remove the plugin */
1167
968
FD_CLR(proc->fd, &rfds_all);
1168
969
1169
970
/* Block signal while modifying process_list */
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1171
(SIG_BLOCK,
1172
&sigchld_action.sa_mask,
1173
NULL));
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1174
972
if(ret < 0){
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
973
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
1177
975
goto fallback;
1178
976
}
1179
1180
plugin *next_plugin = proc->next;
1181
977
free_plugin(proc);
1182
proc = next_plugin;
1183
1184
978
/* We are done modifying process list, so unblock signal */
1185
ret = (int)(TEMP_FAILURE_RETRY
1186
(sigprocmask(SIG_UNBLOCK,
1187
&sigchld_action.sa_mask, NULL)));
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
NULL);
1188
981
if(ret < 0){
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1191
984
goto fallback;
1192
985
}
1193
986
1194
987
if(plugin_list == NULL){
1195
988
break;
1196
989
}
1197
1198
990
continue;
1199
991
}
1200
992
1201
993
/* This process exited nicely, so print its buffer */
1202
994
1203
995
bool bret = print_out_password(proc->buffer,
1204
996
proc->buffer_length);
1205
997
if(not bret){
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1208
1000
}
1209
1001
goto fallback;
1210
1002
}
1212
1004
/* This process has not completed. Does it have any output? */
1213
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1214
1006
/* This process had nothing to say at this time */
1215
proc = proc->next;
1216
1007
continue;
1217
1008
}
1218
1009
/* Before reading, make the process' data buffer large enough */
1219
1010
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1220
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1221
+ (size_t) BUFFER_SIZE);
1222
if(new_buffer == NULL){
1223
error(0, errno, "malloc");
1224
exitstatus = EX_OSERR;
1011
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1014
perror("malloc");
1015
exitstatus = EXIT_FAILURE;
1225
1016
goto fallback;
1226
1017
}
1227
proc->buffer = new_buffer;
1228
1018
proc->buffer_size += BUFFER_SIZE;
1229
1019
}
1230
1020
/* Read from the process */
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1232
proc->buffer
1233
+ proc->buffer_length,
1234
BUFFER_SIZE));
1235
if(sret < 0){
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1236
1024
/* Read error from this process; ignore the error */
1237
proc = proc->next;
1238
1025
continue;
1239
1026
}
1240
if(sret == 0){
1027
if(ret == 0){
1241
1028
/* got EOF */
1242
1029
proc->eof = true;
1243
1030
} else {
1244
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1245
1032
}
1246
1033
}
1247
1034
}
1248
1249
1035
1036
1250
1037
fallback:
1251
1038
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1254
1040
/* Fallback if all plugins failed, none are found or an error
1255
1041
occured */
1256
1042
bool bret;
1264
1050
}
1265
1051
bret = print_out_password(passwordbuffer, len);
1266
1052
if(not bret){
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1269
1055
}
1270
1056
}
1271
1057
1272
1058
/* Restore old signal handler */
1273
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1274
1060
if(ret == -1){
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1277
1063
}
1278
1064
1279
1065
if(custom_argv != NULL){
1280
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1281
1067
free(*arg);
1283
1069
free(custom_argv);
1284
1070
}
1285
1071
1286
free(direntries);
1287
1288
if(dir_fd != -1){
1289
close(dir_fd);
1072
if(dir != NULL){
1073
closedir(dir);
1290
1074
}
1291
1075
1292
/* Kill the processes */
1076
/* Free the process list and kill the processes */
1293
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1294
1078
if(p->pid != 0){
1295
1079
close(p->fd);
1296
1080
ret = kill(p->pid, SIGTERM);
1297
1081
if(ret == -1 and errno != ESRCH){
1298
1082
/* Set-uid proccesses might not get closed */
1299
error(0, errno, "kill");
1083
perror("kill");
1300
1084
}
1301
1085
}
1302
1086
}
1303
1087
1304
1088
/* Wait for any remaining child processes to terminate */
1305
do {
1089
do{
1306
1090
ret = wait(NULL);
1307
1091
} while(ret >= 0);
1308
1092
if(errno != ECHILD){
1309
error(0, errno, "wait");
1093
perror("wait");
1310
1094
}
1311
1095
1312
1096
free_plugin_list();
1313
1097
1314
1098
free(plugindir);
1315
free(pluginhelperdir);
1316
1099
free(argfile);
1317
1100
1318
1101
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0