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- Committer: Teddy Hogeborn
- Date: 2018-02-08 10:02:51 UTC
- Revision ID: teddy@recompile.se-20180208100251-x7qq39sjsgk4r2sq
Update Debian watch file to version 4
* debian/watch (version): Change to "4".
(opts/pgpsigurlmangle): Remove.
(opts/pgpmode): New; set to "auto".
(URL): Change to "https://ftp.recompile.se/pub/@PACKAGE@/@PACKAGE@@ANY_VERSION@(?:\.orig)?@ARCHIVE_EXT@".
* debian/watch (version): Change to "4".
(opts/pgpsigurlmangle): Remove.
(opts/pgpmode): New; set to "auto".
(URL): Change to "https://ftp.recompile.se/pub/@PACKAGE@/@PACKAGE@@ANY_VERSION@(?:\.orig)?@ARCHIVE_EXT@".
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
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
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
17
19
*
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
22
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
24
25
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
27
O_CLOEXEC, pipe2() */
27
28
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
30
31
#include <stdbool.h> /* bool, true, false */
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() */
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() */
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() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
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() */
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
*/
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
56
57
#include <errno.h> /* errno */
57
58
#include <argp.h> /* struct argp_option, struct
58
59
argp_state, struct argp,
62
63
#include <signal.h> /* struct sigaction, sigemptyset(),
63
64
sigaddset(), sigaction(),
64
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
66
68
#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
75
68
76
#define BUFFER_SIZE 256
69
77
70
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
71
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
81
73
82
const char *argp_program_version = "plugin-runner " VERSION;
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
84
76
85
typedef struct plugin{
77
86
char *name; /* can be NULL or any plugin name */
80
89
char **environ;
81
90
int envc;
82
91
bool disabled;
83
92
84
93
/* Variables used for running processes*/
85
94
pid_t pid;
86
95
int fd;
88
97
size_t buffer_size;
89
98
size_t buffer_length;
90
99
bool eof;
91
volatile bool completed;
92
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
93
102
struct plugin *next;
94
103
} plugin;
95
104
97
106
98
107
/* Gets an existing plugin based on name,
99
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
100
110
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
111
/* Check for existing plugin with that name */
102
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
103
113
if((p->name == name)
104
114
or (p->name and name and (strcmp(p->name, name) == 0))){
106
116
}
107
117
}
108
118
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
110
123
if(new_plugin == NULL){
111
124
return NULL;
112
125
}
113
126
char *copy_name = NULL;
114
127
if(name != NULL){
115
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
117
135
return NULL;
118
136
}
119
137
}
120
138
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
125
143
126
new_plugin->argv = malloc(sizeof(char *) * 2);
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
127
147
if(new_plugin->argv == NULL){
148
int e = errno;
128
149
free(copy_name);
129
150
free(new_plugin);
151
errno = e;
130
152
return NULL;
131
153
}
132
154
new_plugin->argv[0] = copy_name;
133
155
new_plugin->argv[1] = NULL;
134
156
135
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
136
160
if(new_plugin->environ == NULL){
161
int e = errno;
137
162
free(copy_name);
138
163
free(new_plugin->argv);
139
164
free(new_plugin);
165
errno = e;
140
166
return NULL;
141
167
}
142
168
new_plugin->environ[0] = NULL;
147
173
}
148
174
149
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
150
177
static bool add_to_char_array(const char *new, char ***array,
151
178
int *len){
152
179
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
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
185
/* Malloc check */
156
if(*array == NULL){
186
if(new_array == NULL){
157
187
return false;
158
188
}
189
*array = new_array;
159
190
/* Make a copy of the new string */
160
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
161
195
if(copy == NULL){
162
196
return false;
163
197
}
170
204
}
171
205
172
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
173
208
static bool add_argument(plugin *p, const char *arg){
174
209
if(p == NULL){
175
210
return false;
178
213
}
179
214
180
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
181
217
static bool add_environment(plugin *p, const char *def, bool replace){
182
218
if(p == NULL){
183
219
return false;
185
221
/* namelen = length of name of environment variable */
186
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
223
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
190
226
/* It already exists */
191
227
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
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
233
return false;
195
234
}
196
*e = new;
197
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
198
237
}
199
238
return true;
200
239
}
202
241
return add_to_char_array(def, &(p->environ), &(p->envc));
203
242
}
204
243
244
#ifndef O_CLOEXEC
205
245
/*
206
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
247
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
249
*/
250
__attribute__((warn_unused_result))
210
251
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
253
/* If reading the flags failed, return error indication now. */
213
254
if(ret < 0){
214
255
return ret;
215
256
}
216
257
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
218
260
}
261
#endif /* not O_CLOEXEC */
219
262
220
263
221
264
/* Mark processes as completed when they exit, and save their exit
222
265
status. */
223
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
224
268
while(true){
225
269
plugin *proc = plugin_list;
226
270
int status;
230
274
break;
231
275
}
232
276
if(pid == -1){
233
if(errno != ECHILD){
234
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
235
280
}
236
/* No child processes */
237
break;
281
error(0, errno, "waitpid");
238
282
}
239
283
240
284
/* A child exited, find it in process_list */
246
290
continue;
247
291
}
248
292
proc->status = status;
249
proc->completed = true;
293
proc->completed = 1;
250
294
}
295
errno = old_errno;
251
296
}
252
297
253
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
254
300
static bool print_out_password(const char *buffer, size_t length){
255
301
ssize_t ret;
256
302
for(size_t written = 0; written < length; written += (size_t)ret){
264
310
}
265
311
266
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
267
314
static void free_plugin(plugin *plugin_node){
268
315
316
free(plugin_node->name);
269
317
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
318
free(*arg);
271
319
}
275
323
}
276
324
free(plugin_node->environ);
277
325
free(plugin_node->buffer);
278
326
279
327
/* Removes the plugin from the singly-linked list */
280
328
if(plugin_node == plugin_list){
281
329
/* First one - simple */
301
349
302
350
int main(int argc, char *argv[]){
303
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
304
353
char *argfile = NULL;
305
354
FILE *conffp;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
355
struct dirent **direntries = NULL;
309
356
struct stat st;
310
357
fd_set rfds_all;
311
358
int ret, maxfd = 0;
319
366
.sa_flags = SA_NOCLDSTOP };
320
367
char **custom_argv = NULL;
321
368
int custom_argc = 0;
369
int dir_fd = -1;
322
370
323
371
/* Establish a signal handler */
324
372
sigemptyset(&sigchld_action.sa_mask);
325
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
374
if(ret == -1){
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
329
377
goto fallback;
330
378
}
331
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
380
if(ret == -1){
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
335
383
goto fallback;
336
384
}
337
385
369
417
.doc = "Group ID the plugins will run as", .group = 3 },
370
418
{ .name = "debug", .key = 132,
371
419
.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 },
372
433
{ .name = NULL }
373
434
};
374
435
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
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
442
case 'g': /* --global-options */
379
if(arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
388
448
}
389
449
}
450
errno = 0;
390
451
}
391
452
break;
392
453
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
398
456
}
399
457
break;
400
458
case 'o': /* --options-for */
401
if(arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
418
}
419
}
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;
420
480
}
421
481
break;
422
482
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
483
{
427
484
char *envdef = strchr(arg, ':');
428
485
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
429
488
break;
430
489
}
431
490
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
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;
434
499
}
435
500
}
436
501
break;
437
502
case 'd': /* --disable */
438
if(arg != NULL){
503
{
439
504
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
442
508
}
443
p->disabled = true;
444
509
}
445
510
break;
446
511
case 'e': /* --enable */
447
if(arg != NULL){
512
{
448
513
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
451
517
}
452
p->disabled = false;
453
518
}
454
519
break;
455
520
case 128: /* --plugin-dir */
456
521
free(plugindir);
457
522
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
523
if(plugindir != NULL){
524
errno = 0;
525
}
461
526
break;
462
527
case 129: /* --config-file */
463
528
/* This is already done by parse_opt_config_file() */
464
529
break;
465
530
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
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;
471
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
472
540
break;
473
541
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
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
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
480
551
break;
481
552
case 132: /* --debug */
482
553
debug = true;
483
554
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;
484
576
/*
485
577
* When adding more options before this line, remember to also add a
486
578
* "case" to the "parse_opt_config_file" function below.
489
581
/* Cryptsetup always passes an argument, which is an empty
490
582
string if "none" was specified in /etc/crypttab. So if
491
583
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
584
if(arg[0] == '\0'){
585
break;
494
586
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
587
default:
499
588
return ARGP_ERR_UNKNOWN;
500
589
}
501
return 0;
590
return errno; /* Set to 0 at start */
502
591
}
503
592
504
593
/* This option parser is the same as parse_opt() above, except it
505
594
ignores everything but the --config-file option. */
506
595
error_t parse_opt_config_file(int key, char *arg,
507
596
__attribute__((unused))
508
struct argp_state *state) {
509
switch(key) {
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
510
600
case 'g': /* --global-options */
511
601
case 'G': /* --global-env */
512
602
case 'o': /* --options-for */
518
608
case 129: /* --config-file */
519
609
free(argfile);
520
610
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
611
if(argfile != NULL){
612
errno = 0;
523
613
}
524
break;
614
break;
525
615
case 130: /* --userid */
526
616
case 131: /* --groupid */
527
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
528
622
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
623
break;
531
624
default:
532
625
return ARGP_ERR_UNKNOWN;
533
626
}
534
return 0;
627
return errno;
535
628
}
536
629
537
630
struct argp argp = { .options = options,
541
634
542
635
/* Parse using parse_opt_config_file() in order to get the custom
543
636
config file location, if any. */
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
546
fprintf(stderr, "Unknown error while parsing arguments\n");
547
exitstatus = EXIT_FAILURE;
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;
548
651
goto fallback;
549
652
}
550
653
556
659
conffp = fopen(AFILE, "r");
557
660
} else {
558
661
conffp = fopen(argfile, "r");
559
}
662
}
560
663
if(conffp != NULL){
561
664
char *org_line = NULL;
562
665
char *p, *arg, *new_arg, *line;
563
666
size_t size = 0;
564
667
const char whitespace_delims[] = " \r\t\f\v\n";
565
668
const char comment_delim[] = "#";
566
669
567
670
custom_argc = 1;
568
671
custom_argv = malloc(sizeof(char*) * 2);
569
672
if(custom_argv == NULL){
570
perror("malloc");
571
exitstatus = EXIT_FAILURE;
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
572
675
goto fallback;
573
676
}
574
677
custom_argv[0] = argv[0];
575
678
custom_argv[1] = NULL;
576
679
577
680
/* for each line in the config file, strip whitespace and ignore
578
681
commented text */
579
682
while(true){
581
684
if(sret == -1){
582
685
break;
583
686
}
584
687
585
688
line = org_line;
586
689
arg = strsep(&line, comment_delim);
587
690
while((p = strsep(&arg, whitespace_delims)) != NULL){
590
693
}
591
694
new_arg = strdup(p);
592
695
if(new_arg == NULL){
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
595
698
free(org_line);
596
699
goto fallback;
597
700
}
598
701
599
702
custom_argc += 1;
600
custom_argv = realloc(custom_argv, sizeof(char *)
601
* ((unsigned int) custom_argc + 1));
602
if(custom_argv == NULL){
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
605
free(org_line);
606
goto fallback;
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
715
}
608
716
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
717
custom_argv[custom_argc] = NULL;
610
718
}
611
719
}
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
}
612
728
free(org_line);
613
729
} else {
614
730
/* Check for harmful errors and go to fallback. Other errors might
615
731
not affect opening plugins */
616
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
617
perror("fopen");
618
exitstatus = EXIT_FAILURE;
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
619
735
goto fallback;
620
736
}
621
737
}
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
624
740
if(custom_argv != NULL){
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
exitstatus = EXIT_FAILURE;
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;
630
755
goto fallback;
631
756
}
632
757
}
633
758
634
759
/* Parse actual command line arguments, to let them override the
635
760
config file */
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
640
goto fallback;
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
}
641
794
}
642
795
643
796
if(debug){
644
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
645
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
646
799
p->name ? p->name : "Global", p->argc - 1);
647
800
for(char **a = p->argv; *a != NULL; a++){
648
801
fprintf(stderr, "\tArg: %s\n", *a);
649
802
}
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
651
804
for(char **a = p->environ; *a != NULL; a++){
652
805
fprintf(stderr, "\t%s\n", *a);
653
806
}
654
807
}
655
808
}
656
809
657
/* Strip permissions down to nobody */
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
}
658
839
ret = setuid(uid);
659
840
if(ret == -1){
660
perror("setuid");
661
}
662
setgid(gid);
663
if(ret == -1){
664
perror("setgid");
665
}
666
667
if(plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
673
if(dir == NULL){
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
680
845
{
681
int dir_fd = dirfd(dir);
682
if(dir_fd >= 0){
683
ret = set_cloexec_flag(dir_fd);
684
if(ret < 0){
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
687
goto fallback;
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
890
}
689
891
}
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;
690
902
}
691
903
692
904
FD_ZERO(&rfds_all);
693
905
694
906
/* Read and execute any executable in the plugin directory*/
695
while(true){
696
dirst = readdir(dir);
697
698
/* All directory entries have been processed */
699
if(dirst == NULL){
700
if(errno == EBADF){
701
perror("readdir");
702
exitstatus = EXIT_FAILURE;
703
goto fallback;
704
}
705
break;
706
}
707
708
d_name_len = strlen(dirst->d_name);
709
710
/* Ignore dotfiles, backup files and other junk */
711
{
712
bool bad_name = false;
713
714
const char const *bad_prefixes[] = { ".", "#", NULL };
715
716
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
717
".dpkg-old",
718
".dpkg-bak",
719
".dpkg-divert", NULL };
720
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
721
size_t pre_len = strlen(*pre);
722
if((d_name_len >= pre_len)
723
and strncmp((dirst->d_name), *pre, pre_len) == 0){
724
if(debug){
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
726
" with bad prefix %s\n", dirst->d_name, *pre);
727
}
728
bad_name = true;
729
break;
730
}
731
}
732
if(bad_name){
733
continue;
734
}
735
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
736
size_t suf_len = strlen(*suf);
737
if((d_name_len >= suf_len)
738
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
739
== 0)){
740
if(debug){
741
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
742
" with bad suffix %s\n", dirst->d_name, *suf);
743
}
744
bad_name = true;
745
break;
746
}
747
}
748
749
if(bad_name){
750
continue;
751
}
752
}
753
754
char *filename;
755
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
757
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
759
}
760
if(ret < 0){
761
perror("asprintf");
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]);
762
913
continue;
763
914
}
764
765
ret = stat(filename, &st);
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
766
916
if(ret == -1){
767
perror("stat");
768
free(filename);
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
769
920
continue;
770
921
}
771
922
772
923
/* Ignore non-executable files */
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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)){
774
927
if(debug){
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
" with bad type or mode\n", filename);
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);
777
932
}
778
free(filename);
933
close(plugin_fd);
934
free(direntries[i]);
779
935
continue;
780
936
}
781
937
782
plugin *p = getplugin(dirst->d_name);
938
plugin *p = getplugin(direntries[i]->d_name);
783
939
if(p == NULL){
784
perror("getplugin");
785
free(filename);
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
786
943
continue;
787
944
}
788
945
if(p->disabled){
789
946
if(debug){
790
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
791
dirst->d_name);
948
direntries[i]->d_name);
792
949
}
793
free(filename);
950
close(plugin_fd);
951
free(direntries[i]);
794
952
continue;
795
953
}
796
954
{
799
957
if(g != NULL){
800
958
for(char **a = g->argv + 1; *a != NULL; a++){
801
959
if(not add_argument(p, *a)){
802
perror("add_argument");
960
error(0, errno, "add_argument");
803
961
}
804
962
}
805
963
/* Add global environment variables */
806
964
for(char **e = g->environ; *e != NULL; e++){
807
965
if(not add_environment(p, *e, false)){
808
perror("add_environment");
966
error(0, errno, "add_environment");
809
967
}
810
968
}
811
969
}
812
970
}
813
/* If this plugin has any environment variables, we will call
814
using execve and need to duplicate the environment from this
815
process, too. */
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
816
973
if(p->environ[0] != NULL){
817
974
for(char **e = environ; *e != NULL; e++){
818
975
if(not add_environment(p, *e, false)){
819
perror("add_environment");
976
error(0, errno, "add_environment");
820
977
}
821
978
}
822
979
}
823
980
824
981
int pipefd[2];
825
ret = pipe(pipefd);
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 */
826
987
if(ret == -1){
827
perror("pipe");
828
exitstatus = EXIT_FAILURE;
829
goto fallback;
830
}
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
831
1003
/* Ask OS to automatic close the pipe on exec */
832
1004
ret = set_cloexec_flag(pipefd[0]);
833
1005
if(ret < 0){
834
perror("set_cloexec_flag");
835
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
836
1011
goto fallback;
837
1012
}
838
1013
ret = set_cloexec_flag(pipefd[1]);
839
1014
if(ret < 0){
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
842
1020
goto fallback;
843
1021
}
1022
#endif /* not O_CLOEXEC */
844
1023
/* Block SIGCHLD until process is safely in process list */
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1026
NULL));
846
1027
if(ret < 0){
847
perror("sigprocmask");
848
exitstatus = EXIT_FAILURE;
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
849
1031
goto fallback;
850
1032
}
851
1033
/* Starting a new process to be watched */
852
pid_t pid = fork();
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
853
1038
if(pid == -1){
854
perror("fork");
855
exitstatus = EXIT_FAILURE;
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]);
856
1046
goto fallback;
857
1047
}
858
1048
if(pid == 0){
859
1049
/* this is the child process */
860
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
861
1051
if(ret < 0){
862
perror("sigaction");
863
_exit(EXIT_FAILURE);
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
864
1054
}
865
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
866
1056
if(ret < 0){
867
perror("sigprocmask");
868
_exit(EXIT_FAILURE);
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
869
1059
}
870
1060
871
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
872
1062
if(ret == -1){
873
perror("dup2");
874
_exit(EXIT_FAILURE);
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
875
1065
}
876
1066
877
if(dirfd(dir) < 0){
878
/* If dir has no file descriptor, we could not set FD_CLOEXEC
879
above and must now close it manually here. */
880
closedir(dir);
881
}
882
if(p->environ[0] == NULL){
883
if(execv(filename, p->argv) < 0){
884
perror("execv");
885
_exit(EXIT_FAILURE);
886
}
887
} else {
888
if(execve(filename, p->argv, p->environ) < 0){
889
perror("execve");
890
_exit(EXIT_FAILURE);
891
}
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);
892
1073
}
893
1074
/* no return */
894
1075
}
895
1076
/* Parent process */
896
1077
close(pipefd[1]); /* Close unused write end of pipe */
897
free(filename);
898
plugin *new_plugin = getplugin(dirst->d_name);
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
899
1080
if(new_plugin == NULL){
900
perror("getplugin");
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1084
NULL)));
902
1085
if(ret < 0){
903
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
904
1087
}
905
exitstatus = EXIT_FAILURE;
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
906
1090
goto fallback;
907
1091
}
1092
free(direntries[i]);
908
1093
909
1094
new_plugin->pid = pid;
910
1095
new_plugin->fd = pipefd[0];
911
1096
912
1097
/* Unblock SIGCHLD so signal handler can be run if this process
913
1098
has already completed */
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
1101
NULL));
915
1102
if(ret < 0){
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
918
1105
goto fallback;
919
1106
}
920
1107
925
1112
}
926
1113
}
927
1114
928
closedir(dir);
929
dir = NULL;
1115
free(direntries);
1116
direntries = NULL;
1117
close(dir_fd);
1118
dir_fd = -1;
1119
free_plugin(getplugin(NULL));
930
1120
931
1121
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
1122
if(p->pid != 0){
943
1133
while(plugin_list){
944
1134
fd_set rfds = rfds_all;
945
1135
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if(select_ret == -1){
947
perror("select");
948
exitstatus = EXIT_FAILURE;
1136
if(select_ret == -1 and errno != EINTR){
1137
error(0, errno, "select");
1138
exitstatus = EX_OSERR;
949
1139
goto fallback;
950
1140
}
951
1141
/* OK, now either a process completed, or something can be read
952
1142
from one of them */
953
1143
for(plugin *proc = plugin_list; proc != NULL;){
954
1144
/* Is this process completely done? */
955
if(proc->eof and proc->completed){
1145
if(proc->completed and proc->eof){
956
1146
/* Only accept the plugin output if it exited cleanly */
957
1147
if(not WIFEXITED(proc->status)
958
1148
or WEXITSTATUS(proc->status) != 0){
959
1149
/* Bad exit by plugin */
960
1150
961
1151
if(debug){
962
1152
if(WIFEXITED(proc->status)){
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
965
1156
WEXITSTATUS(proc->status));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
970
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
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
1163
}
974
1164
}
975
1165
976
1166
/* Remove the plugin */
977
1167
FD_CLR(proc->fd, &rfds_all);
978
1168
979
1169
/* Block signal while modifying process_list */
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1171
(SIG_BLOCK,
1172
&sigchld_action.sa_mask,
1173
NULL));
981
1174
if(ret < 0){
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
984
1177
goto fallback;
985
1178
}
986
1179
989
1182
proc = next_plugin;
990
1183
991
1184
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
1185
ret = (int)(TEMP_FAILURE_RETRY
1186
(sigprocmask(SIG_UNBLOCK,
1187
&sigchld_action.sa_mask, NULL)));
994
1188
if(ret < 0){
995
perror("sigprocmask");
996
exitstatus = EXIT_FAILURE;
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
997
1191
goto fallback;
998
1192
}
999
1193
1009
1203
bool bret = print_out_password(proc->buffer,
1010
1204
proc->buffer_length);
1011
1205
if(not bret){
1012
perror("print_out_password");
1013
exitstatus = EXIT_FAILURE;
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
1014
1208
}
1015
1209
goto fallback;
1016
1210
}
1023
1217
}
1024
1218
/* Before reading, make the process' data buffer large enough */
1025
1219
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
+ (size_t) BUFFER_SIZE);
1028
if(proc->buffer == NULL){
1029
perror("malloc");
1030
exitstatus = EXIT_FAILURE;
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;
1031
1225
goto fallback;
1032
1226
}
1227
proc->buffer = new_buffer;
1033
1228
proc->buffer_size += BUFFER_SIZE;
1034
1229
}
1035
1230
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1232
proc->buffer
1233
+ proc->buffer_length,
1234
BUFFER_SIZE));
1038
1235
if(sret < 0){
1039
1236
/* Read error from this process; ignore the error */
1040
1237
proc = proc->next;
1048
1245
}
1049
1246
}
1050
1247
}
1051
1052
1248
1249
1053
1250
fallback:
1054
1251
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
1056
1254
/* Fallback if all plugins failed, none are found or an error
1057
1255
occured */
1058
1256
bool bret;
1066
1264
}
1067
1265
bret = print_out_password(passwordbuffer, len);
1068
1266
if(not bret){
1069
perror("print_out_password");
1070
exitstatus = EXIT_FAILURE;
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
1071
1269
}
1072
1270
}
1073
1271
1074
1272
/* Restore old signal handler */
1075
1273
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1076
1274
if(ret == -1){
1077
perror("sigaction");
1078
exitstatus = EXIT_FAILURE;
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
1079
1277
}
1080
1278
1081
1279
if(custom_argv != NULL){
1085
1283
free(custom_argv);
1086
1284
}
1087
1285
1088
if(dir != NULL){
1089
closedir(dir);
1286
free(direntries);
1287
1288
if(dir_fd != -1){
1289
close(dir_fd);
1090
1290
}
1091
1291
1092
1292
/* Kill the processes */
1096
1296
ret = kill(p->pid, SIGTERM);
1097
1297
if(ret == -1 and errno != ESRCH){
1098
1298
/* Set-uid proccesses might not get closed */
1099
perror("kill");
1299
error(0, errno, "kill");
1100
1300
}
1101
1301
}
1102
1302
}
1103
1303
1104
1304
/* Wait for any remaining child processes to terminate */
1105
do{
1305
do {
1106
1306
ret = wait(NULL);
1107
1307
} while(ret >= 0);
1108
1308
if(errno != ECHILD){
1109
perror("wait");
1309
error(0, errno, "wait");
1110
1310
}
1111
1311
1112
1312
free_plugin_list();
1113
1313
1114
1314
free(plugindir);
1315
free(pluginhelperdir);
1115
1316
free(argfile);
1116
1317
1117
1318
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0