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- Committer: Björn Påhlsson
- Date: 2009-01-29 22:01:00 UTC
- Revision ID: belorn@nexus-20090129220100-8wzzh4q1b1ka56a2
* mandos (main): Catch SIGSEGV and raise RuntimeError.
- 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() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
68
76
69
#define BUFFER_SIZE 256
77
70
78
71
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
73
82
74
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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 */
102
/* Check for exiting plugin with that name */
112
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
104
if((p->name == name)
114
105
or (p->name and name and (strcmp(p->name, name) == 0))){
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);
110
plugin *new_plugin = malloc(sizeof(plugin));
123
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
118
free(new_plugin);
134
errno = e;
135
119
return NULL;
136
120
}
137
121
}
138
122
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
123
*new_plugin = (plugin) { .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
143
127
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
147
129
if(new_plugin->argv == NULL){
148
int e = errno;
149
130
free(copy_name);
150
131
free(new_plugin);
151
errno = e;
152
132
return NULL;
153
133
}
154
134
new_plugin->argv[0] = copy_name;
155
135
new_plugin->argv[1] = NULL;
156
136
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
160
138
if(new_plugin->environ == NULL){
161
int e = errno;
162
139
free(copy_name);
163
140
free(new_plugin->argv);
164
141
free(new_plugin);
165
errno = e;
166
142
return NULL;
167
143
}
168
144
new_plugin->environ[0] = NULL;
173
149
}
174
150
175
151
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
152
static bool add_to_char_array(const char *new, char ***array,
178
153
int *len){
179
154
/* 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);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
185
157
/* Malloc check */
186
if(new_array == NULL){
158
if(*array == NULL){
187
159
return false;
188
160
}
189
*array = new_array;
190
161
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
195
163
if(copy == NULL){
196
164
return false;
197
165
}
204
172
}
205
173
206
174
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
175
static bool add_argument(plugin *p, const char *arg){
209
176
if(p == NULL){
210
177
return false;
213
180
}
214
181
215
182
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
183
static bool add_environment(plugin *p, const char *def, bool replace){
218
184
if(p == NULL){
219
185
return false;
221
187
/* namelen = length of name of environment variable */
222
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
189
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
226
192
/* It already exists */
227
193
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){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
233
196
return false;
234
197
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
198
*e = new;
199
strcpy(*e, def);
237
200
}
238
201
return true;
239
202
}
241
204
return add_to_char_array(def, &(p->environ), &(p->envc));
242
205
}
243
206
244
#ifndef O_CLOEXEC
245
207
/*
246
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
209
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
211
*/
250
__attribute__((warn_unused_result))
251
212
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
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
225
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
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
256
static 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){
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
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
359
314
ssize_t sret;
315
intmax_t tmpmax;
360
316
uid_t uid = 65534;
361
317
gid_t gid = 65534;
362
318
bool debug = false;
366
322
.sa_flags = SA_NOCLDSTOP };
367
323
char **custom_argv = NULL;
368
324
int custom_argc = 0;
369
int dir_fd = -1;
370
325
371
326
/* Establish a signal handler */
372
327
sigemptyset(&sigchld_action.sa_mask);
373
328
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
329
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
330
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
377
332
goto fallback;
378
333
}
379
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
335
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
336
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
383
338
goto fallback;
384
339
}
385
340
417
372
.doc = "Group ID the plugins will run as", .group = 3 },
418
373
{ .name = "debug", .key = 132,
419
374
.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
375
{ .name = NULL }
434
376
};
435
377
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;
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
442
381
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;
382
if(arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
448
391
}
449
392
}
450
errno = 0;
451
393
}
452
394
break;
453
395
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
456
401
}
457
402
break;
458
403
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;
404
if(arg != NULL){
405
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
407
break;
408
}
409
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
411
break;
412
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
421
}
422
}
480
423
}
481
424
break;
482
425
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
483
429
{
484
430
char *envdef = strchr(arg, ':');
485
431
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
432
break;
489
433
}
490
434
*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;
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
499
437
}
500
438
}
501
439
break;
502
440
case 'd': /* --disable */
503
{
441
if(arg != NULL){
504
442
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
508
445
}
446
p->disabled = true;
509
447
}
510
448
break;
511
449
case 'e': /* --enable */
512
{
450
if(arg != NULL){
513
451
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
517
454
}
455
p->disabled = false;
518
456
}
519
457
break;
520
458
case 128: /* --plugin-dir */
521
459
free(plugindir);
522
460
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
461
if(plugindir == NULL){
462
perror("strdup");
463
}
526
464
break;
527
465
case 129: /* --config-file */
528
466
/* This is already done by parse_opt_config_file() */
529
467
break;
530
468
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;
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
537
476
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
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;
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
548
486
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
551
487
break;
552
488
case 132: /* --debug */
553
489
debug = true;
554
490
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
491
/*
577
492
* When adding more options before this line, remember to also add a
578
493
* "case" to the "parse_opt_config_file" function below.
581
496
/* Cryptsetup always passes an argument, which is an empty
582
497
string if "none" was specified in /etc/crypttab. So if
583
498
argument was empty, we ignore it silently. */
584
if(arg[0] == '\0'){
585
break;
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
586
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
587
505
default:
588
506
return ARGP_ERR_UNKNOWN;
589
507
}
590
return errno; /* Set to 0 at start */
508
return 0;
591
509
}
592
510
593
511
/* This option parser is the same as parse_opt() above, except it
594
512
ignores everything but the --config-file option. */
595
513
error_t parse_opt_config_file(int key, char *arg,
596
514
__attribute__((unused))
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
515
struct argp_state *state) {
516
switch(key) {
600
517
case 'g': /* --global-options */
601
518
case 'G': /* --global-env */
602
519
case 'o': /* --options-for */
608
525
case 129: /* --config-file */
609
526
free(argfile);
610
527
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
528
if(argfile == NULL){
529
perror("strdup");
613
530
}
614
break;
531
break;
615
532
case 130: /* --userid */
616
533
case 131: /* --groupid */
617
534
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
622
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
623
537
break;
624
538
default:
625
539
return ARGP_ERR_UNKNOWN;
626
540
}
627
return errno;
541
return 0;
628
542
}
629
543
630
544
struct argp argp = { .options = options,
634
548
635
549
/* Parse using parse_opt_config_file() in order to get the custom
636
550
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;
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
553
fprintf(stderr, "Unknown error while parsing arguments\n");
554
exitstatus = EXIT_FAILURE;
651
555
goto fallback;
652
556
}
653
557
659
563
conffp = fopen(AFILE, "r");
660
564
} else {
661
565
conffp = fopen(argfile, "r");
662
}
566
}
663
567
if(conffp != NULL){
664
568
char *org_line = NULL;
665
569
char *p, *arg, *new_arg, *line;
666
570
size_t size = 0;
667
571
const char whitespace_delims[] = " \r\t\f\v\n";
668
572
const char comment_delim[] = "#";
669
573
670
574
custom_argc = 1;
671
575
custom_argv = malloc(sizeof(char*) * 2);
672
576
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
675
579
goto fallback;
676
580
}
677
581
custom_argv[0] = argv[0];
678
582
custom_argv[1] = NULL;
679
583
680
584
/* for each line in the config file, strip whitespace and ignore
681
585
commented text */
682
586
while(true){
684
588
if(sret == -1){
685
589
break;
686
590
}
687
591
688
592
line = org_line;
689
593
arg = strsep(&line, comment_delim);
690
594
while((p = strsep(&arg, whitespace_delims)) != NULL){
693
597
}
694
598
new_arg = strdup(p);
695
599
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
698
602
free(org_line);
699
603
goto fallback;
700
604
}
701
605
702
606
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
}
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
715
614
}
716
615
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
616
custom_argv[custom_argc] = NULL;
718
617
}
719
618
}
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
619
free(org_line);
729
620
} else {
730
621
/* Check for harmful errors and go to fallback. Other errors might
731
622
not affect opening plugins */
732
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
735
626
goto fallback;
736
627
}
737
628
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
740
631
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;
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
635
fprintf(stderr, "Unknown error while parsing arguments\n");
636
exitstatus = EXIT_FAILURE;
755
637
goto fallback;
756
638
}
757
639
}
758
640
759
641
/* Parse actual command line arguments, to let them override the
760
642
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
}
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
794
648
}
795
649
796
650
if(debug){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
653
p->name ? p->name : "Global", p->argc - 1);
800
654
for(char **a = p->argv; *a != NULL; a++){
807
661
}
808
662
}
809
663
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
}
664
/* Strip permissions down to nobody */
839
665
ret = setuid(uid);
840
666
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
667
perror("setuid");
668
}
669
setgid(gid);
670
if(ret == -1){
671
perror("setgid");
672
}
673
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
680
if(dir == NULL){
681
perror("Could not open plugin dir");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
684
}
685
686
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
687
{
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;
688
int dir_fd = dirfd(dir);
689
if(dir_fd >= 0){
690
ret = set_cloexec_flag(dir_fd);
691
if(ret < 0){
692
perror("set_cloexec_flag");
693
exitstatus = EXIT_FAILURE;
694
goto fallback;
890
695
}
891
696
}
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
697
}
903
698
904
699
FD_ZERO(&rfds_all);
905
700
906
701
/* 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]);
702
while(true){
703
dirst = readdir(dir);
704
705
/* All directory entries have been processed */
706
if(dirst == NULL){
707
if(errno == EBADF){
708
perror("readdir");
709
exitstatus = EXIT_FAILURE;
710
goto fallback;
711
}
712
break;
713
}
714
715
d_name_len = strlen(dirst->d_name);
716
717
/* Ignore dotfiles, backup files and other junk */
718
{
719
bool bad_name = false;
720
721
const char const *bad_prefixes[] = { ".", "#", NULL };
722
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
".dpkg-old",
725
".dpkg-bak",
726
".dpkg-divert", NULL };
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
size_t pre_len = strlen(*pre);
729
if((d_name_len >= pre_len)
730
and strncmp((dirst->d_name), *pre, pre_len) == 0){
731
if(debug){
732
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
733
" with bad prefix %s\n", dirst->d_name, *pre);
734
}
735
bad_name = true;
736
break;
737
}
738
}
739
if(bad_name){
740
continue;
741
}
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
size_t suf_len = strlen(*suf);
744
if((d_name_len >= suf_len)
745
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
746
== 0)){
747
if(debug){
748
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
749
" with bad suffix %s\n", dirst->d_name, *suf);
750
}
751
bad_name = true;
752
break;
753
}
754
}
755
756
if(bad_name){
757
continue;
758
}
759
}
760
761
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
767
if(ret < 0){
768
perror("asprintf");
913
769
continue;
914
770
}
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
771
772
ret = stat(filename, &st);
916
773
if(ret == -1){
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
774
perror("stat");
775
free(filename);
920
776
continue;
921
777
}
922
778
923
779
/* 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)){
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
781
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);
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
" with bad type or mode\n", filename);
932
784
}
933
close(plugin_fd);
934
free(direntries[i]);
785
free(filename);
935
786
continue;
936
787
}
937
788
938
plugin *p = getplugin(direntries[i]->d_name);
789
plugin *p = getplugin(dirst->d_name);
939
790
if(p == NULL){
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
791
perror("getplugin");
792
free(filename);
943
793
continue;
944
794
}
945
795
if(p->disabled){
946
796
if(debug){
947
797
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
798
dirst->d_name);
949
799
}
950
close(plugin_fd);
951
free(direntries[i]);
800
free(filename);
952
801
continue;
953
802
}
954
803
{
957
806
if(g != NULL){
958
807
for(char **a = g->argv + 1; *a != NULL; a++){
959
808
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
809
perror("add_argument");
961
810
}
962
811
}
963
812
/* Add global environment variables */
964
813
for(char **e = g->environ; *e != NULL; e++){
965
814
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
815
perror("add_environment");
967
816
}
968
817
}
969
818
}
970
819
}
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
820
/* If this plugin has any environment variables, we will call
821
using execve and need to duplicate the environment from this
822
process, too. */
973
823
if(p->environ[0] != NULL){
974
824
for(char **e = environ; *e != NULL; e++){
975
825
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
826
perror("add_environment");
977
827
}
978
828
}
979
829
}
980
830
981
831
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 */
832
ret = pipe(pipefd);
987
833
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
834
perror("pipe");
835
exitstatus = EXIT_FAILURE;
836
goto fallback;
837
}
1003
838
/* Ask OS to automatic close the pipe on exec */
1004
839
ret = set_cloexec_flag(pipefd[0]);
1005
840
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]);
841
perror("set_cloexec_flag");
842
exitstatus = EXIT_FAILURE;
1011
843
goto fallback;
1012
844
}
1013
845
ret = set_cloexec_flag(pipefd[1]);
1014
846
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]);
847
perror("set_cloexec_flag");
848
exitstatus = EXIT_FAILURE;
1020
849
goto fallback;
1021
850
}
1022
#endif /* not O_CLOEXEC */
1023
851
/* 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));
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1027
853
if(ret < 0){
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1031
856
goto fallback;
1032
857
}
1033
858
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
859
pid_t pid = fork();
1038
860
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]);
861
perror("fork");
862
exitstatus = EXIT_FAILURE;
1046
863
goto fallback;
1047
864
}
1048
865
if(pid == 0){
1049
866
/* this is the child process */
1050
867
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
868
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
869
perror("sigaction");
870
_exit(EXIT_FAILURE);
1054
871
}
1055
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
873
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
874
perror("sigprocmask");
875
_exit(EXIT_FAILURE);
1059
876
}
1060
877
1061
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
879
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
880
perror("dup2");
881
_exit(EXIT_FAILURE);
1065
882
}
1066
883
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);
884
if(dirfd(dir) < 0){
885
/* If dir has no file descriptor, we could not set FD_CLOEXEC
886
above and must now close it manually here. */
887
closedir(dir);
888
}
889
if(p->environ[0] == NULL){
890
if(execv(filename, p->argv) < 0){
891
perror("execv");
892
_exit(EXIT_FAILURE);
893
}
894
} else {
895
if(execve(filename, p->argv, p->environ) < 0){
896
perror("execve");
897
_exit(EXIT_FAILURE);
898
}
1073
899
}
1074
900
/* no return */
1075
901
}
1076
902
/* Parent process */
1077
903
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
904
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
1080
906
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)));
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
909
if(ret < 0){
1086
error(0, errno, "sigprocmask");
910
perror("sigprocmask");
1087
911
}
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
912
exitstatus = EXIT_FAILURE;
1090
913
goto fallback;
1091
914
}
1092
free(direntries[i]);
1093
915
1094
916
new_plugin->pid = pid;
1095
917
new_plugin->fd = pipefd[0];
1096
918
1097
919
/* Unblock SIGCHLD so signal handler can be run if this process
1098
920
has already completed */
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
1101
NULL));
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1102
922
if(ret < 0){
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
923
perror("sigprocmask");
924
exitstatus = EXIT_FAILURE;
1105
925
goto fallback;
1106
926
}
1107
927
1112
932
}
1113
933
}
1114
934
1115
free(direntries);
1116
direntries = NULL;
1117
close(dir_fd);
1118
dir_fd = -1;
1119
free_plugin(getplugin(NULL));
935
closedir(dir);
936
dir = NULL;
1120
937
1121
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
1122
939
if(p->pid != 0){
1133
950
while(plugin_list){
1134
951
fd_set rfds = rfds_all;
1135
952
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;
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1139
956
goto fallback;
1140
957
}
1141
958
/* OK, now either a process completed, or something can be read
1142
959
from one of them */
1143
960
for(plugin *proc = plugin_list; proc != NULL;){
1144
961
/* Is this process completely done? */
1145
if(proc->completed and proc->eof){
962
if(proc->eof and proc->completed){
1146
963
/* Only accept the plugin output if it exited cleanly */
1147
964
if(not WIFEXITED(proc->status)
1148
965
or WEXITSTATUS(proc->status) != 0){
1149
966
/* Bad exit by plugin */
1150
967
1151
968
if(debug){
1152
969
if(WIFEXITED(proc->status)){
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1156
972
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)));
973
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
976
WTERMSIG(proc->status));
977
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
1163
980
}
1164
981
}
1165
982
1166
983
/* Remove the plugin */
1167
984
FD_CLR(proc->fd, &rfds_all);
1168
985
1169
986
/* Block signal while modifying process_list */
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1171
(SIG_BLOCK,
1172
&sigchld_action.sa_mask,
1173
NULL));
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1174
988
if(ret < 0){
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
989
perror("sigprocmask");
990
exitstatus = EXIT_FAILURE;
1177
991
goto fallback;
1178
992
}
1179
993
1182
996
proc = next_plugin;
1183
997
1184
998
/* 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)));
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1188
1001
if(ret < 0){
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1191
1004
goto fallback;
1192
1005
}
1193
1006
1203
1016
bool bret = print_out_password(proc->buffer,
1204
1017
proc->buffer_length);
1205
1018
if(not bret){
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
1019
perror("print_out_password");
1020
exitstatus = EXIT_FAILURE;
1208
1021
}
1209
1022
goto fallback;
1210
1023
}
1217
1030
}
1218
1031
/* Before reading, make the process' data buffer large enough */
1219
1032
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;
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
1036
perror("malloc");
1037
exitstatus = EXIT_FAILURE;
1225
1038
goto fallback;
1226
1039
}
1227
proc->buffer = new_buffer;
1228
1040
proc->buffer_size += BUFFER_SIZE;
1229
1041
}
1230
1042
/* Read from the process */
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1232
proc->buffer
1233
+ proc->buffer_length,
1234
BUFFER_SIZE));
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1235
1045
if(sret < 0){
1236
1046
/* Read error from this process; ignore the error */
1237
1047
proc = proc->next;
1245
1055
}
1246
1056
}
1247
1057
}
1248
1249
1058
1059
1250
1060
fallback:
1251
1061
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1254
1063
/* Fallback if all plugins failed, none are found or an error
1255
1064
occured */
1256
1065
bool bret;
1264
1073
}
1265
1074
bret = print_out_password(passwordbuffer, len);
1266
1075
if(not bret){
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
1076
perror("print_out_password");
1077
exitstatus = EXIT_FAILURE;
1269
1078
}
1270
1079
}
1271
1080
1272
1081
/* Restore old signal handler */
1273
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1274
1083
if(ret == -1){
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1277
1086
}
1278
1087
1279
1088
if(custom_argv != NULL){
1283
1092
free(custom_argv);
1284
1093
}
1285
1094
1286
free(direntries);
1287
1288
if(dir_fd != -1){
1289
close(dir_fd);
1095
if(dir != NULL){
1096
closedir(dir);
1290
1097
}
1291
1098
1292
1099
/* Kill the processes */
1296
1103
ret = kill(p->pid, SIGTERM);
1297
1104
if(ret == -1 and errno != ESRCH){
1298
1105
/* Set-uid proccesses might not get closed */
1299
error(0, errno, "kill");
1106
perror("kill");
1300
1107
}
1301
1108
}
1302
1109
}
1303
1110
1304
1111
/* Wait for any remaining child processes to terminate */
1305
do {
1112
do{
1306
1113
ret = wait(NULL);
1307
1114
} while(ret >= 0);
1308
1115
if(errno != ECHILD){
1309
error(0, errno, "wait");
1116
perror("wait");
1310
1117
}
1311
1118
1312
1119
free_plugin_list();
1313
1120
1314
1121
free(plugindir);
1315
free(pluginhelperdir);
1316
1122
free(argfile);
1317
1123
1318
1124
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0