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- Committer: teddy at recompile
- Date: 2020-07-04 08:59:37 UTC
- mto: This revision was merged to the branch mainline in revision 400.
- Revision ID: teddy@recompile.se-20200704085937-r495zb32nfng9lnt
In initramfs-tools boots, only use setsid when available
* initramfs-tools-script: If available, use setsid to start
mandos-to-cryptroot-unlock.
* initramfs-tools-script: If available, use setsid to start
mandos-to-cryptroot-unlock.
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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 © 2008-2018 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
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(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
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,
65
66
SIG_UNBLOCK, kill(), sig_atomic_t
66
67
*/
67
68
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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() */
69
75
70
76
#define BUFFER_SIZE 256
71
77
72
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
73
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
81
75
82
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
77
84
78
85
typedef struct plugin{
79
86
char *name; /* can be NULL or any plugin name */
82
89
char **environ;
83
90
int envc;
84
91
bool disabled;
85
92
86
93
/* Variables used for running processes*/
87
94
pid_t pid;
88
95
int fd;
99
106
100
107
/* Gets an existing plugin based on name,
101
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
102
110
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
111
/* Check for existing plugin with that name */
104
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
113
if((p->name == name)
106
114
or (p->name and name and (strcmp(p->name, name) == 0))){
108
116
}
109
117
}
110
118
/* Create a new plugin */
111
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);
112
123
if(new_plugin == NULL){
113
124
return NULL;
114
125
}
115
126
char *copy_name = NULL;
116
127
if(name != NULL){
117
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
118
131
if(copy_name == NULL){
132
int e = errno;
119
133
free(new_plugin);
134
errno = e;
120
135
return NULL;
121
136
}
122
137
}
126
141
.disabled = false,
127
142
.next = plugin_list };
128
143
129
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);
130
147
if(new_plugin->argv == NULL){
148
int e = errno;
131
149
free(copy_name);
132
150
free(new_plugin);
151
errno = e;
133
152
return NULL;
134
153
}
135
154
new_plugin->argv[0] = copy_name;
136
155
new_plugin->argv[1] = NULL;
137
156
138
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
139
160
if(new_plugin->environ == NULL){
161
int e = errno;
140
162
free(copy_name);
141
163
free(new_plugin->argv);
142
164
free(new_plugin);
165
errno = e;
143
166
return NULL;
144
167
}
145
168
new_plugin->environ[0] = NULL;
150
173
}
151
174
152
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
153
177
static bool add_to_char_array(const char *new, char ***array,
154
178
int *len){
155
179
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
158
196
/* Malloc check */
159
if(*array == NULL){
197
if(new_array == NULL){
160
198
return false;
161
199
}
200
*array = new_array;
162
201
/* Make a copy of the new string */
163
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
164
206
if(copy == NULL){
165
207
return false;
166
208
}
173
215
}
174
216
175
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
176
219
static bool add_argument(plugin *p, const char *arg){
177
220
if(p == NULL){
178
221
return false;
181
224
}
182
225
183
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
184
228
static bool add_environment(plugin *p, const char *def, bool replace){
185
229
if(p == NULL){
186
230
return false;
188
232
/* namelen = length of name of environment variable */
189
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
234
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
193
237
/* It already exists */
194
238
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
197
244
return false;
198
245
}
199
*e = new;
200
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
201
248
}
202
249
return true;
203
250
}
205
252
return add_to_char_array(def, &(p->environ), &(p->envc));
206
253
}
207
254
255
#ifndef O_CLOEXEC
208
256
/*
209
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
258
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
260
*/
261
__attribute__((warn_unused_result))
213
262
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
264
/* If reading the flags failed, return error indication now. */
216
265
if(ret < 0){
217
266
return ret;
218
267
}
219
268
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
221
271
}
272
#endif /* not O_CLOEXEC */
222
273
223
274
224
275
/* Mark processes as completed when they exit, and save their exit
238
289
/* No child processes */
239
290
break;
240
291
}
241
perror("waitpid");
292
error(0, errno, "waitpid");
242
293
}
243
294
244
295
/* A child exited, find it in process_list */
256
307
}
257
308
258
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
259
311
static bool print_out_password(const char *buffer, size_t length){
260
312
ssize_t ret;
261
313
for(size_t written = 0; written < length; written += (size_t)ret){
269
321
}
270
322
271
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
272
325
static void free_plugin(plugin *plugin_node){
273
326
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
275
328
free(*arg);
276
329
}
330
free(plugin_node->name);
277
331
free(plugin_node->argv);
278
332
for(char **env = plugin_node->environ; *env != NULL; env++){
279
333
free(*env);
280
334
}
281
335
free(plugin_node->environ);
282
336
free(plugin_node->buffer);
283
337
284
338
/* Removes the plugin from the singly-linked list */
285
339
if(plugin_node == plugin_list){
286
340
/* First one - simple */
306
360
307
361
int main(int argc, char *argv[]){
308
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
309
364
char *argfile = NULL;
310
365
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
366
struct dirent **direntries = NULL;
314
367
struct stat st;
315
368
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
369
int ret, maxfd = 0;
317
370
ssize_t sret;
318
intmax_t tmpmax;
319
371
uid_t uid = 65534;
320
372
gid_t gid = 65534;
321
373
bool debug = false;
325
377
.sa_flags = SA_NOCLDSTOP };
326
378
char **custom_argv = NULL;
327
379
int custom_argc = 0;
380
int dir_fd = -1;
328
381
329
382
/* Establish a signal handler */
330
383
sigemptyset(&sigchld_action.sa_mask);
331
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
385
if(ret == -1){
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
335
388
goto fallback;
336
389
}
337
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
391
if(ret == -1){
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
341
394
goto fallback;
342
395
}
343
396
375
428
.doc = "Group ID the plugins will run as", .group = 3 },
376
429
{ .name = "debug", .key = 132,
377
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
378
444
{ .name = NULL }
379
445
};
380
446
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
383
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
384
453
case 'g': /* --global-options */
385
if(arg != NULL){
454
{
386
455
char *plugin_option;
387
456
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
391
457
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
458
break;
394
459
}
395
460
}
461
errno = 0;
396
462
}
397
463
break;
398
464
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
404
467
}
405
468
break;
406
469
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
417
488
}
418
489
}
490
errno = 0;
419
491
}
420
492
break;
421
493
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
494
{
426
495
char *envdef = strchr(arg, ':');
427
496
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
428
499
break;
429
500
}
430
501
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
502
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
433
510
}
434
511
}
435
512
break;
436
513
case 'd': /* --disable */
437
if(arg != NULL){
514
{
438
515
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
441
519
}
442
p->disabled = true;
443
520
}
444
521
break;
445
522
case 'e': /* --enable */
446
if(arg != NULL){
523
{
447
524
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
450
528
}
451
p->disabled = false;
452
529
}
453
530
break;
454
531
case 128: /* --plugin-dir */
455
532
free(plugindir);
456
533
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
534
if(plugindir != NULL){
535
errno = 0;
536
}
460
537
break;
461
538
case 129: /* --config-file */
462
539
/* This is already done by parse_opt_config_file() */
463
540
break;
464
541
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
472
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
473
551
break;
474
552
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
482
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
483
562
break;
484
563
case 132: /* --debug */
485
564
debug = true;
486
565
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
487
589
/*
488
590
* When adding more options before this line, remember to also add a
489
591
* "case" to the "parse_opt_config_file" function below.
492
594
/* Cryptsetup always passes an argument, which is an empty
493
595
string if "none" was specified in /etc/crypttab. So if
494
596
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
597
if(arg[0] == '\0'){
598
break;
497
599
}
498
break;
499
case ARGP_KEY_END:
500
break;
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
501
605
default:
502
606
return ARGP_ERR_UNKNOWN;
503
607
}
504
return 0;
608
return errno; /* Set to 0 at start */
505
609
}
506
610
507
611
/* This option parser is the same as parse_opt() above, except it
509
613
error_t parse_opt_config_file(int key, char *arg,
510
614
__attribute__((unused))
511
615
struct argp_state *state){
616
errno = 0;
512
617
switch(key){
513
618
case 'g': /* --global-options */
514
619
case 'G': /* --global-env */
521
626
case 129: /* --config-file */
522
627
free(argfile);
523
628
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
526
631
}
527
break;
632
break;
528
633
case 130: /* --userid */
529
634
case 131: /* --groupid */
530
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
531
640
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
641
break;
534
642
default:
535
643
return ARGP_ERR_UNKNOWN;
536
644
}
537
return 0;
645
return errno;
538
646
}
539
647
540
648
struct argp argp = { .options = options,
544
652
545
653
/* Parse using parse_opt_config_file() in order to get the custom
546
654
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
551
669
goto fallback;
552
670
}
553
671
559
677
conffp = fopen(AFILE, "r");
560
678
} else {
561
679
conffp = fopen(argfile, "r");
562
}
680
}
563
681
if(conffp != NULL){
564
682
char *org_line = NULL;
565
683
char *p, *arg, *new_arg, *line;
566
684
size_t size = 0;
567
685
const char whitespace_delims[] = " \r\t\f\v\n";
568
686
const char comment_delim[] = "#";
569
687
570
688
custom_argc = 1;
571
689
custom_argv = malloc(sizeof(char*) * 2);
572
690
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
575
693
goto fallback;
576
694
}
577
695
custom_argv[0] = argv[0];
578
696
custom_argv[1] = NULL;
579
697
580
698
/* for each line in the config file, strip whitespace and ignore
581
699
commented text */
582
700
while(true){
584
702
if(sret == -1){
585
703
break;
586
704
}
587
705
588
706
line = org_line;
589
707
arg = strsep(&line, comment_delim);
590
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
593
711
}
594
712
new_arg = strdup(p);
595
713
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
598
716
free(org_line);
599
717
goto fallback;
600
718
}
601
719
602
720
custom_argc += 1;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
610
744
}
611
745
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
613
747
}
614
748
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
615
757
free(org_line);
616
758
} else {
617
759
/* Check for harmful errors and go to fallback. Other errors might
618
760
not affect opening plugins */
619
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
622
764
goto fallback;
623
765
}
624
766
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
627
769
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
633
784
goto fallback;
634
785
}
635
786
}
636
787
637
788
/* Parse actual command line arguments, to let them override the
638
789
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
644
823
}
645
824
646
825
if(debug){
647
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
648
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
649
828
p->name ? p->name : "Global", p->argc - 1);
650
829
for(char **a = p->argv; *a != NULL; a++){
657
836
}
658
837
}
659
838
660
/* Strip permissions down to nobody */
661
setgid(gid);
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
662
865
if(ret == -1){
663
perror("setgid");
866
error(0, errno, "setgid");
664
867
}
665
868
ret = setuid(uid);
666
869
if(ret == -1){
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
683
874
{
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
691
919
}
692
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
693
931
}
694
932
695
933
FD_ZERO(&rfds_all);
696
934
697
935
/* Read and execute any executable in the plugin directory*/
698
while(true){
699
dirst = readdir(dir);
700
701
/* All directory entries have been processed */
702
if(dirst == NULL){
703
if(errno == EBADF){
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
708
break;
709
}
710
711
d_name_len = strlen(dirst->d_name);
712
713
/* Ignore dotfiles, backup files and other junk */
714
{
715
bool bad_name = false;
716
717
const char const *bad_prefixes[] = { ".", "#", NULL };
718
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
720
".dpkg-old",
721
".dpkg-bak",
722
".dpkg-divert", NULL };
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
size_t pre_len = strlen(*pre);
725
if((d_name_len >= pre_len)
726
and strncmp((dirst->d_name), *pre, pre_len) == 0){
727
if(debug){
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad prefix %s\n", dirst->d_name, *pre);
730
}
731
bad_name = true;
732
break;
733
}
734
}
735
if(bad_name){
736
continue;
737
}
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
size_t suf_len = strlen(*suf);
740
if((d_name_len >= suf_len)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
742
== 0)){
743
if(debug){
744
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
745
" with bad suffix %s\n", dirst->d_name, *suf);
746
}
747
bad_name = true;
748
break;
749
}
750
}
751
752
if(bad_name){
753
continue;
754
}
755
}
756
757
char *filename;
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
763
if(ret < 0){
764
perror("asprintf");
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
765
942
continue;
766
943
}
767
768
ret = stat(filename, &st);
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
769
945
if(ret == -1){
770
perror("stat");
771
free(filename);
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
772
949
continue;
773
950
}
774
951
775
952
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
777
956
if(debug){
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
780
961
}
781
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
782
964
continue;
783
965
}
784
966
785
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
786
968
if(p == NULL){
787
perror("getplugin");
788
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
789
972
continue;
790
973
}
791
974
if(p->disabled){
792
975
if(debug){
793
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
794
dirst->d_name);
977
direntries[i]->d_name);
795
978
}
796
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
797
981
continue;
798
982
}
799
983
{
802
986
if(g != NULL){
803
987
for(char **a = g->argv + 1; *a != NULL; a++){
804
988
if(not add_argument(p, *a)){
805
perror("add_argument");
989
error(0, errno, "add_argument");
806
990
}
807
991
}
808
992
/* Add global environment variables */
809
993
for(char **e = g->environ; *e != NULL; e++){
810
994
if(not add_environment(p, *e, false)){
811
perror("add_environment");
995
error(0, errno, "add_environment");
812
996
}
813
997
}
814
998
}
815
999
}
816
/* If this plugin has any environment variables, we will call
817
using execve and need to duplicate the environment from this
818
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
819
1002
if(p->environ[0] != NULL){
820
1003
for(char **e = environ; *e != NULL; e++){
821
1004
if(not add_environment(p, *e, false)){
822
perror("add_environment");
1005
error(0, errno, "add_environment");
823
1006
}
824
1007
}
825
1008
}
826
1009
827
1010
int pipefd[2];
828
ret = pipe(pipefd);
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
829
1016
if(ret == -1){
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
832
goto fallback;
833
}
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
834
1032
/* Ask OS to automatic close the pipe on exec */
835
1033
ret = set_cloexec_flag(pipefd[0]);
836
1034
if(ret < 0){
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
839
1040
goto fallback;
840
1041
}
841
1042
ret = set_cloexec_flag(pipefd[1]);
842
1043
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
845
1049
goto fallback;
846
1050
}
1051
#endif /* not O_CLOEXEC */
847
1052
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
849
1056
if(ret < 0){
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
852
1060
goto fallback;
853
1061
}
854
1062
/* Starting a new process to be watched */
855
pid_t pid = fork();
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
856
1067
if(pid == -1){
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
859
1075
goto fallback;
860
1076
}
861
1077
if(pid == 0){
862
1078
/* this is the child process */
863
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
864
1080
if(ret < 0){
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
867
1083
}
868
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
1085
if(ret < 0){
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
872
1088
}
873
1089
874
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
1091
if(ret == -1){
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
878
1094
}
879
1095
880
if(dirfd(dir) < 0){
881
/* If dir has no file descriptor, we could not set FD_CLOEXEC
882
above and must now close it manually here. */
883
closedir(dir);
884
}
885
if(p->environ[0] == NULL){
886
if(execv(filename, p->argv) < 0){
887
perror("execv");
888
_exit(EXIT_FAILURE);
889
}
890
} else {
891
if(execve(filename, p->argv, p->environ) < 0){
892
perror("execve");
893
_exit(EXIT_FAILURE);
894
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
895
1102
}
896
1103
/* no return */
897
1104
}
898
1105
/* Parent process */
899
1106
close(pipefd[1]); /* Close unused write end of pipe */
900
free(filename);
901
plugin *new_plugin = getplugin(dirst->d_name);
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
902
1109
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
905
1114
if(ret < 0){
906
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
907
1116
}
908
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
909
1119
goto fallback;
910
1120
}
1121
free(direntries[i]);
911
1122
912
1123
new_plugin->pid = pid;
913
1124
new_plugin->fd = pipefd[0];
914
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
915
1131
/* Unblock SIGCHLD so signal handler can be run if this process
916
1132
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
918
1136
if(ret < 0){
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
921
1139
goto fallback;
922
1140
}
923
1141
928
1146
}
929
1147
}
930
1148
931
closedir(dir);
932
dir = NULL;
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
933
1153
free_plugin(getplugin(NULL));
934
1154
935
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
947
1167
while(plugin_list){
948
1168
fd_set rfds = rfds_all;
949
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
953
1173
goto fallback;
954
1174
}
955
1175
/* OK, now either a process completed, or something can be read
961
1181
if(not WIFEXITED(proc->status)
962
1182
or WEXITSTATUS(proc->status) != 0){
963
1183
/* Bad exit by plugin */
964
1184
965
1185
if(debug){
966
1186
if(WIFEXITED(proc->status)){
967
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
970
1190
WEXITSTATUS(proc->status));
971
1191
} else if(WIFSIGNALED(proc->status)){
972
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
1193
" signal %d: %s\n", proc->name,
974
1194
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
976
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
979
1197
}
980
1198
}
981
1199
982
1200
/* Remove the plugin */
983
1201
FD_CLR(proc->fd, &rfds_all);
984
1202
985
1203
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
987
1208
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
990
1211
goto fallback;
991
1212
}
992
1213
995
1216
proc = next_plugin;
996
1217
997
1218
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
1000
1222
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1003
1225
goto fallback;
1004
1226
}
1005
1227
1015
1237
bool bret = print_out_password(proc->buffer,
1016
1238
proc->buffer_length);
1017
1239
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
1020
1242
}
1021
1243
goto fallback;
1022
1244
}
1029
1251
}
1030
1252
/* Before reading, make the process' data buffer large enough */
1031
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1037
1259
goto fallback;
1038
1260
}
1261
proc->buffer = new_buffer;
1039
1262
proc->buffer_size += BUFFER_SIZE;
1040
1263
}
1041
1264
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1044
1269
if(sret < 0){
1045
1270
/* Read error from this process; ignore the error */
1046
1271
proc = proc->next;
1054
1279
}
1055
1280
}
1056
1281
}
1057
1058
1282
1283
1059
1284
fallback:
1060
1285
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1062
1288
/* Fallback if all plugins failed, none are found or an error
1063
1289
occured */
1064
1290
bool bret;
1072
1298
}
1073
1299
bret = print_out_password(passwordbuffer, len);
1074
1300
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1077
1303
}
1078
1304
}
1079
1305
1080
1306
/* Restore old signal handler */
1081
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1308
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1085
1311
}
1086
1312
1087
1313
if(custom_argv != NULL){
1091
1317
free(custom_argv);
1092
1318
}
1093
1319
1094
if(dir != NULL){
1095
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1096
1324
}
1097
1325
1098
1326
/* Kill the processes */
1102
1330
ret = kill(p->pid, SIGTERM);
1103
1331
if(ret == -1 and errno != ESRCH){
1104
1332
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1333
error(0, errno, "kill");
1106
1334
}
1107
1335
}
1108
1336
}
1109
1337
1110
1338
/* Wait for any remaining child processes to terminate */
1111
do{
1339
do {
1112
1340
ret = wait(NULL);
1113
1341
} while(ret >= 0);
1114
1342
if(errno != ECHILD){
1115
perror("wait");
1343
error(0, errno, "wait");
1116
1344
}
1117
1345
1118
1346
free_plugin_list();
1119
1347
1120
1348
free(plugindir);
1349
free(pluginhelperdir);
1121
1350
free(argfile);
1122
1351
1123
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0