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- Committer: Teddy Hogeborn
- Date: 2021-01-31 21:40:15 UTC
- mto: This revision was merged to the branch mainline in revision 404.
- Revision ID: teddy@recompile.se-20210131214015-yz7ogk2mqfdfflo6
Work around Debian bug #981302
* plugin-runner.c (main): If the /dev/fd symlink is missing, create
it.
* plugins.d/mandos-client.c (main): - '' -
Reported-By: Eero Häkkinen <+debian-bts-2021@eero.xn--hkkinen-5wa.fi>
Suggested-by: Eero Häkkinen <+debian-bts-2021@eero.xn--hkkinen-5wa.fi>
Thanks: Eero Häkkinen for bug report and analysis
* plugin-runner.c (main): If the /dev/fd symlink is missing, create
it.
* plugins.d/mandos-client.c (main): - '' -
Reported-By: Eero Häkkinen <+debian-bts-2021@eero.xn--hkkinen-5wa.fi>
Suggested-by: Eero Häkkinen <+debian-bts-2021@eero.xn--hkkinen-5wa.fi>
Thanks: Eero Häkkinen for bug report and analysis
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- debian/mandos-client.config
- 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 Teddy Hogeborn
6
* Copyright © 2008 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 © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 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
lstat(), symlink() */
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 */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
105
115
return p;
106
116
}
107
117
}
108
118
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
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);
127
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
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
#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);
155
196
/* Malloc check */
156
if(*array == NULL){
197
if(new_array == NULL){
157
198
return false;
158
199
}
200
*array = new_array;
159
201
/* Make a copy of the new string */
160
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
161
206
if(copy == NULL){
162
207
return false;
163
208
}
170
215
}
171
216
172
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
173
219
static bool add_argument(plugin *p, const char *arg){
174
220
if(p == NULL){
175
221
return false;
178
224
}
179
225
180
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
181
228
static bool add_environment(plugin *p, const char *def, bool replace){
182
229
if(p == NULL){
183
230
return false;
185
232
/* namelen = length of name of environment variable */
186
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
234
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
190
237
/* It already exists */
191
238
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
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){
194
244
return false;
195
245
}
196
*e = new;
197
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
198
248
}
199
249
return true;
200
250
}
202
252
return add_to_char_array(def, &(p->environ), &(p->envc));
203
253
}
204
254
255
#ifndef O_CLOEXEC
205
256
/*
206
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
258
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
260
*/
261
__attribute__((warn_unused_result))
210
262
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
264
/* If reading the flags failed, return error indication now. */
213
265
if(ret < 0){
214
266
return ret;
215
267
}
216
268
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
218
271
}
272
#endif /* not O_CLOEXEC */
219
273
220
274
221
275
/* Mark processes as completed when they exit, and save their exit
222
276
status. */
223
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
224
279
while(true){
225
280
plugin *proc = plugin_list;
226
281
int status;
230
285
break;
231
286
}
232
287
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
235
291
}
236
/* No child processes */
237
break;
292
error(0, errno, "waitpid");
238
293
}
239
294
240
295
/* A child exited, find it in process_list */
246
301
continue;
247
302
}
248
303
proc->status = status;
249
proc->completed = true;
304
proc->completed = 1;
250
305
}
306
errno = old_errno;
251
307
}
252
308
253
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
254
311
static bool print_out_password(const char *buffer, size_t length){
255
312
ssize_t ret;
256
313
for(size_t written = 0; written < length; written += (size_t)ret){
264
321
}
265
322
266
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
267
325
static void free_plugin(plugin *plugin_node){
268
326
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
270
328
free(*arg);
271
329
}
330
free(plugin_node->name);
272
331
free(plugin_node->argv);
273
332
for(char **env = plugin_node->environ; *env != NULL; env++){
274
333
free(*env);
275
334
}
276
335
free(plugin_node->environ);
277
336
free(plugin_node->buffer);
278
337
279
338
/* Removes the plugin from the singly-linked list */
280
339
if(plugin_node == plugin_list){
281
340
/* First one - simple */
301
360
302
361
int main(int argc, char *argv[]){
303
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
304
364
char *argfile = NULL;
305
365
FILE *conffp;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
366
struct dirent **direntries = NULL;
309
367
struct stat st;
310
368
fd_set rfds_all;
311
369
int ret, maxfd = 0;
370
ssize_t sret;
312
371
uid_t uid = 65534;
313
372
gid_t gid = 65534;
314
373
bool debug = false;
318
377
.sa_flags = SA_NOCLDSTOP };
319
378
char **custom_argv = NULL;
320
379
int custom_argc = 0;
380
int dir_fd = -1;
321
381
322
382
/* Establish a signal handler */
323
383
sigemptyset(&sigchld_action.sa_mask);
324
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
325
385
if(ret == -1){
326
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
328
388
goto fallback;
329
389
}
330
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
331
391
if(ret == -1){
332
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
334
394
goto fallback;
335
395
}
336
396
368
428
.doc = "Group ID the plugins will run as", .group = 3 },
369
429
{ .name = "debug", .key = 132,
370
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 },
371
444
{ .name = NULL }
372
445
};
373
446
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
376
switch (key) {
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
377
453
case 'g': /* --global-options */
378
if (arg != NULL){
379
char *p;
380
while((p = strsep(&arg, ",")) != NULL){
381
if(p[0] == '\0'){
382
continue;
383
}
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
return ARGP_ERR_UNKNOWN;
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
387
459
}
388
460
}
461
errno = 0;
389
462
}
390
463
break;
391
464
case 'G': /* --global-env */
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
397
467
}
398
468
break;
399
469
case 'o': /* --options-for */
400
if (arg != NULL){
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
403
break;
404
}
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
407
break;
408
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
417
}
418
}
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;
488
}
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
uid = (uid_t)strtol(arg, NULL, 10);
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;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
466
551
break;
467
552
case 131: /* --groupid */
468
gid = (gid_t)strtol(arg, NULL, 10);
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;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
469
562
break;
470
563
case 132: /* --debug */
471
564
debug = true;
472
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;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
473
593
case ARGP_KEY_ARG:
474
594
/* Cryptsetup always passes an argument, which is an empty
475
595
string if "none" was specified in /etc/crypttab. So if
476
596
argument was empty, we ignore it silently. */
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
597
if(arg[0] == '\0'){
598
break;
479
599
}
480
break;
481
case ARGP_KEY_END:
482
break;
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
483
605
default:
484
606
return ARGP_ERR_UNKNOWN;
485
607
}
486
return 0;
608
return errno; /* Set to 0 at start */
487
609
}
488
610
489
611
/* This option parser is the same as parse_opt() above, except it
490
612
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
495
618
case 'g': /* --global-options */
496
619
case 'G': /* --global-env */
497
620
case 'o': /* --options-for */
503
626
case 129: /* --config-file */
504
627
free(argfile);
505
628
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
508
631
}
509
break;
632
break;
510
633
case 130: /* --userid */
511
634
case 131: /* --groupid */
512
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
513
640
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
641
break;
516
642
default:
517
643
return ARGP_ERR_UNKNOWN;
518
644
}
519
return 0;
645
return errno;
520
646
}
521
647
522
648
struct argp argp = { .options = options,
524
650
.args_doc = "",
525
651
.doc = "Mandos plugin runner -- Run plugins" };
526
652
527
/* Parse using the parse_opt_config_file in order to get the custom
653
/* Parse using parse_opt_config_file() in order to get the custom
528
654
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
532
exitstatus = EXIT_FAILURE;
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;
533
669
goto fallback;
534
670
}
535
671
537
673
argp.parser = parse_opt;
538
674
539
675
/* Open the configfile if available */
540
if (argfile == NULL){
676
if(argfile == NULL){
541
677
conffp = fopen(AFILE, "r");
542
678
} else {
543
679
conffp = fopen(argfile, "r");
544
}
680
}
545
681
if(conffp != NULL){
546
682
char *org_line = NULL;
547
683
char *p, *arg, *new_arg, *line;
548
684
size_t size = 0;
549
ssize_t sret;
550
685
const char whitespace_delims[] = " \r\t\f\v\n";
551
686
const char comment_delim[] = "#";
552
687
553
688
custom_argc = 1;
554
689
custom_argv = malloc(sizeof(char*) * 2);
555
690
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
558
693
goto fallback;
559
694
}
560
695
custom_argv[0] = argv[0];
561
696
custom_argv[1] = NULL;
562
697
563
698
/* for each line in the config file, strip whitespace and ignore
564
699
commented text */
565
700
while(true){
567
702
if(sret == -1){
568
703
break;
569
704
}
570
705
571
706
line = org_line;
572
707
arg = strsep(&line, comment_delim);
573
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
576
711
}
577
712
new_arg = strdup(p);
578
713
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
581
716
free(org_line);
582
717
goto fallback;
583
718
}
584
719
585
720
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
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
}
593
744
}
594
745
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
596
747
}
597
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
}
598
757
free(org_line);
599
758
} else {
600
759
/* Check for harmful errors and go to fallback. Other errors might
601
760
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
605
764
goto fallback;
606
765
}
607
766
}
608
/* If there was any arguments from configuration file,
609
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 */
610
769
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
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;
616
784
goto fallback;
617
785
}
618
786
}
619
787
620
788
/* Parse actual command line arguments, to let them override the
621
789
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
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
}
627
823
}
628
824
629
825
if(debug){
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
631
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
632
828
p->name ? p->name : "Global", p->argc - 1);
633
829
for(char **a = p->argv; *a != NULL; a++){
634
830
fprintf(stderr, "\tArg: %s\n", *a);
635
831
}
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
637
833
for(char **a = p->environ; *a != NULL; a++){
638
834
fprintf(stderr, "\t%s\n", *a);
639
835
}
640
836
}
641
837
}
642
838
643
/* Strip permissions down to nobody */
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
/* Work around Debian bug #981302
863
<https://bugs.debian.org/981302> */
864
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
865
ret = symlink("/proc/self/fd", "/dev/fd");
866
if(ret == -1){
867
error(0, errno, "Failed to create /dev/fd symlink");
868
}
869
}
870
}
871
872
/* Lower permissions */
873
ret = setgid(gid);
874
if(ret == -1){
875
error(0, errno, "setgid");
876
}
644
877
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
878
if(ret == -1){
879
error(0, errno, "setuid");
880
}
881
882
/* Open plugin directory with close_on_exec flag */
666
883
{
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
884
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
885
#ifdef O_CLOEXEC
886
O_CLOEXEC
887
#else /* not O_CLOEXEC */
888
0
889
#endif /* not O_CLOEXEC */
890
);
891
if(dir_fd == -1){
892
error(0, errno, "Could not open plugin dir");
893
exitstatus = EX_UNAVAILABLE;
894
goto fallback;
895
}
896
897
#ifndef O_CLOEXEC
898
/* Set the FD_CLOEXEC flag on the directory */
899
ret = set_cloexec_flag(dir_fd);
900
if(ret < 0){
901
error(0, errno, "set_cloexec_flag");
902
exitstatus = EX_OSERR;
903
goto fallback;
904
}
905
#endif /* O_CLOEXEC */
906
}
907
908
int good_name(const struct dirent * const dirent){
909
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
910
"*.dpkg-old", "*.dpkg-bak",
911
"*.dpkg-divert", NULL };
912
#ifdef __GNUC__
913
#pragma GCC diagnostic push
914
#pragma GCC diagnostic ignored "-Wcast-qual"
915
#endif
916
for(const char **pat = (const char **)patterns;
917
*pat != NULL; pat++){
918
#ifdef __GNUC__
919
#pragma GCC diagnostic pop
920
#endif
921
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
922
!= FNM_NOMATCH){
923
if(debug){
924
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
925
" matching pattern %s\n", dirent->d_name, *pat);
926
}
927
return 0;
674
928
}
675
929
}
930
return 1;
931
}
932
933
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
934
alphasort);
935
if(numplugins == -1){
936
error(0, errno, "Could not scan plugin dir");
937
direntries = NULL;
938
exitstatus = EX_OSERR;
939
goto fallback;
676
940
}
677
941
678
942
FD_ZERO(&rfds_all);
679
943
680
944
/* Read and execute any executable in the plugin directory*/
681
while(true){
682
dirst = readdir(dir);
683
684
/* All directory entries have been processed */
685
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
691
break;
692
}
693
694
d_name_len = strlen(dirst->d_name);
695
696
/* Ignore dotfiles, backup files and other junk */
697
{
698
bool bad_name = false;
699
700
const char const *bad_prefixes[] = { ".", "#", NULL };
701
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-old",
704
".dpkg-bak",
705
".dpkg-divert", NULL };
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
size_t pre_len = strlen(*pre);
708
if((d_name_len >= pre_len)
709
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
if(debug){
711
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
712
" with bad prefix %s\n", dirst->d_name, *pre);
713
}
714
bad_name = true;
715
break;
716
}
717
}
718
if(bad_name){
719
continue;
720
}
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
size_t suf_len = strlen(*suf);
723
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
== 0)){
726
if(debug){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad suffix %s\n", dirst->d_name, *suf);
729
}
730
bad_name = true;
731
break;
732
}
733
}
734
735
if(bad_name){
736
continue;
737
}
738
}
739
740
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
746
if(ret < 0){
747
perror("asprintf");
748
continue;
749
}
750
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
945
for(int i = 0; i < numplugins; i++){
946
947
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
948
if(plugin_fd == -1){
949
error(0, errno, "Could not open plugin");
950
free(direntries[i]);
951
continue;
952
}
953
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
954
if(ret == -1){
955
error(0, errno, "stat");
956
close(plugin_fd);
957
free(direntries[i]);
958
continue;
959
}
960
758
961
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
962
if(not S_ISREG(st.st_mode)
963
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
964
X_OK, 0)) != 0)){
760
965
if(debug){
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
966
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
967
" with bad type or mode\n",
968
plugindir != NULL ? plugindir : PDIR,
969
direntries[i]->d_name);
763
970
}
764
free(filename);
971
close(plugin_fd);
972
free(direntries[i]);
765
973
continue;
766
974
}
767
975
768
plugin *p = getplugin(dirst->d_name);
976
plugin *p = getplugin(direntries[i]->d_name);
769
977
if(p == NULL){
770
perror("getplugin");
771
free(filename);
978
error(0, errno, "getplugin");
979
close(plugin_fd);
980
free(direntries[i]);
772
981
continue;
773
982
}
774
983
if(p->disabled){
775
984
if(debug){
776
985
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
dirst->d_name);
986
direntries[i]->d_name);
778
987
}
779
free(filename);
988
close(plugin_fd);
989
free(direntries[i]);
780
990
continue;
781
991
}
782
992
{
785
995
if(g != NULL){
786
996
for(char **a = g->argv + 1; *a != NULL; a++){
787
997
if(not add_argument(p, *a)){
788
perror("add_argument");
998
error(0, errno, "add_argument");
789
999
}
790
1000
}
791
1001
/* Add global environment variables */
792
1002
for(char **e = g->environ; *e != NULL; e++){
793
1003
if(not add_environment(p, *e, false)){
794
perror("add_environment");
1004
error(0, errno, "add_environment");
795
1005
}
796
1006
}
797
1007
}
798
1008
}
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
1009
/* If this plugin has any environment variables, we need to
1010
duplicate the environment from this process, too. */
802
1011
if(p->environ[0] != NULL){
803
1012
for(char **e = environ; *e != NULL; e++){
804
1013
if(not add_environment(p, *e, false)){
805
perror("add_environment");
1014
error(0, errno, "add_environment");
806
1015
}
807
1016
}
808
1017
}
809
1018
810
1019
int pipefd[2];
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
1020
#ifndef O_CLOEXEC
1021
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1022
#else /* O_CLOEXEC */
1023
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1024
#endif /* O_CLOEXEC */
1025
if(ret == -1){
1026
error(0, errno, "pipe");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
if(pipefd[0] >= FD_SETSIZE){
1032
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1033
FD_SETSIZE);
1034
close(pipefd[0]);
1035
close(pipefd[1]);
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
1038
goto fallback;
1039
}
1040
#ifndef O_CLOEXEC
817
1041
/* Ask OS to automatic close the pipe on exec */
818
1042
ret = set_cloexec_flag(pipefd[0]);
819
1043
if(ret < 0){
820
perror("set_cloexec_flag");
821
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]);
822
1049
goto fallback;
823
1050
}
824
1051
ret = set_cloexec_flag(pipefd[1]);
825
1052
if(ret < 0){
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1053
error(0, errno, "set_cloexec_flag");
1054
close(pipefd[0]);
1055
close(pipefd[1]);
1056
exitstatus = EX_OSERR;
1057
free(direntries[i]);
828
1058
goto fallback;
829
1059
}
1060
#endif /* not O_CLOEXEC */
830
1061
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1062
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1063
&sigchld_action.sa_mask,
1064
NULL));
832
1065
if(ret < 0){
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1066
error(0, errno, "sigprocmask");
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
835
1069
goto fallback;
836
1070
}
837
1071
/* Starting a new process to be watched */
838
pid_t pid = fork();
1072
pid_t pid;
1073
do {
1074
pid = fork();
1075
} while(pid == -1 and errno == EINTR);
839
1076
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1077
error(0, errno, "fork");
1078
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask, NULL));
1080
close(pipefd[0]);
1081
close(pipefd[1]);
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
842
1084
goto fallback;
843
1085
}
844
1086
if(pid == 0){
845
1087
/* this is the child process */
846
1088
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
847
1089
if(ret < 0){
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1090
error(0, errno, "sigaction");
1091
_exit(EX_OSERR);
850
1092
}
851
1093
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
1094
if(ret < 0){
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1095
error(0, errno, "sigprocmask");
1096
_exit(EX_OSERR);
855
1097
}
856
1098
857
1099
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
1100
if(ret == -1){
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1101
error(0, errno, "dup2");
1102
_exit(EX_OSERR);
861
1103
}
862
1104
863
if(dirfd(dir) < 0){
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
866
closedir(dir);
867
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
1105
if(fexecve(plugin_fd, p->argv,
1106
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1107
error(0, errno, "fexecve for %s/%s",
1108
plugindir != NULL ? plugindir : PDIR,
1109
direntries[i]->d_name);
1110
_exit(EX_OSERR);
878
1111
}
879
1112
/* no return */
880
1113
}
881
1114
/* Parent process */
882
1115
close(pipefd[1]); /* Close unused write end of pipe */
883
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1116
close(plugin_fd);
1117
plugin *new_plugin = getplugin(direntries[i]->d_name);
1118
if(new_plugin == NULL){
1119
error(0, errno, "getplugin");
1120
ret = (int)(TEMP_FAILURE_RETRY
1121
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1122
NULL)));
888
1123
if(ret < 0){
889
perror("sigprocmask");
1124
error(0, errno, "sigprocmask");
890
1125
}
891
exitstatus = EXIT_FAILURE;
1126
exitstatus = EX_OSERR;
1127
free(direntries[i]);
892
1128
goto fallback;
893
1129
}
1130
free(direntries[i]);
894
1131
895
1132
new_plugin->pid = pid;
896
1133
new_plugin->fd = pipefd[0];
897
1134
1135
if(debug){
1136
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1137
new_plugin->name, (intmax_t) (new_plugin->pid));
1138
}
1139
898
1140
/* Unblock SIGCHLD so signal handler can be run if this process
899
1141
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1142
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1143
&sigchld_action.sa_mask,
1144
NULL));
901
1145
if(ret < 0){
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1146
error(0, errno, "sigprocmask");
1147
exitstatus = EX_OSERR;
904
1148
goto fallback;
905
1149
}
906
1150
907
1151
FD_SET(new_plugin->fd, &rfds_all);
908
1152
909
if (maxfd < new_plugin->fd){
1153
if(maxfd < new_plugin->fd){
910
1154
maxfd = new_plugin->fd;
911
1155
}
912
1156
}
913
1157
914
closedir(dir);
915
dir = NULL;
1158
free(direntries);
1159
direntries = NULL;
1160
close(dir_fd);
1161
dir_fd = -1;
1162
free_plugin(getplugin(NULL));
916
1163
917
1164
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
1165
if(p->pid != 0){
929
1176
while(plugin_list){
930
1177
fd_set rfds = rfds_all;
931
1178
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1179
if(select_ret == -1 and errno != EINTR){
1180
error(0, errno, "select");
1181
exitstatus = EX_OSERR;
935
1182
goto fallback;
936
1183
}
937
1184
/* OK, now either a process completed, or something can be read
938
1185
from one of them */
939
1186
for(plugin *proc = plugin_list; proc != NULL;){
940
1187
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
1188
if(proc->completed and proc->eof){
942
1189
/* Only accept the plugin output if it exited cleanly */
943
1190
if(not WIFEXITED(proc->status)
944
1191
or WEXITSTATUS(proc->status) != 0){
945
1192
/* Bad exit by plugin */
946
1193
947
1194
if(debug){
948
1195
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1196
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1197
" status %d\n", proc->name,
1198
(intmax_t) (proc->pid),
951
1199
WEXITSTATUS(proc->status));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
956
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1200
} else if(WIFSIGNALED(proc->status)){
1201
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1202
" signal %d: %s\n", proc->name,
1203
(intmax_t) (proc->pid),
1204
WTERMSIG(proc->status),
1205
strsignal(WTERMSIG(proc->status)));
959
1206
}
960
1207
}
961
1208
962
1209
/* Remove the plugin */
963
1210
FD_CLR(proc->fd, &rfds_all);
964
1211
965
1212
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1213
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1214
(SIG_BLOCK,
1215
&sigchld_action.sa_mask,
1216
NULL));
967
1217
if(ret < 0){
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "sigprocmask");
1219
exitstatus = EX_OSERR;
970
1220
goto fallback;
971
1221
}
972
1222
975
1225
proc = next_plugin;
976
1226
977
1227
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1228
ret = (int)(TEMP_FAILURE_RETRY
1229
(sigprocmask(SIG_UNBLOCK,
1230
&sigchld_action.sa_mask, NULL)));
980
1231
if(ret < 0){
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
983
1234
goto fallback;
984
1235
}
985
1236
995
1246
bool bret = print_out_password(proc->buffer,
996
1247
proc->buffer_length);
997
1248
if(not bret){
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1249
error(0, errno, "print_out_password");
1250
exitstatus = EX_IOERR;
1000
1251
}
1001
1252
goto fallback;
1002
1253
}
1009
1260
}
1010
1261
/* Before reading, make the process' data buffer large enough */
1011
1262
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1263
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1264
+ (size_t) BUFFER_SIZE);
1265
if(new_buffer == NULL){
1266
error(0, errno, "malloc");
1267
exitstatus = EX_OSERR;
1017
1268
goto fallback;
1018
1269
}
1270
proc->buffer = new_buffer;
1019
1271
proc->buffer_size += BUFFER_SIZE;
1020
1272
}
1021
1273
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1274
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1275
proc->buffer
1276
+ proc->buffer_length,
1277
BUFFER_SIZE));
1278
if(sret < 0){
1025
1279
/* Read error from this process; ignore the error */
1026
1280
proc = proc->next;
1027
1281
continue;
1028
1282
}
1029
if(ret == 0){
1283
if(sret == 0){
1030
1284
/* got EOF */
1031
1285
proc->eof = true;
1032
1286
} else {
1033
proc->buffer_length += (size_t) ret;
1287
proc->buffer_length += (size_t) sret;
1034
1288
}
1035
1289
}
1036
1290
}
1037
1038
1291
1292
1039
1293
fallback:
1040
1294
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1295
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1296
and exitstatus != EX_OK)){
1042
1297
/* Fallback if all plugins failed, none are found or an error
1043
1298
occured */
1044
1299
bool bret;
1052
1307
}
1053
1308
bret = print_out_password(passwordbuffer, len);
1054
1309
if(not bret){
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1310
error(0, errno, "print_out_password");
1311
exitstatus = EX_IOERR;
1057
1312
}
1058
1313
}
1059
1314
1060
1315
/* Restore old signal handler */
1061
1316
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
1317
if(ret == -1){
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1318
error(0, errno, "sigaction");
1319
exitstatus = EX_OSERR;
1065
1320
}
1066
1321
1067
1322
if(custom_argv != NULL){
1071
1326
free(custom_argv);
1072
1327
}
1073
1328
1074
if(dir != NULL){
1075
closedir(dir);
1329
free(direntries);
1330
1331
if(dir_fd != -1){
1332
close(dir_fd);
1076
1333
}
1077
1334
1078
1335
/* Kill the processes */
1082
1339
ret = kill(p->pid, SIGTERM);
1083
1340
if(ret == -1 and errno != ESRCH){
1084
1341
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1342
error(0, errno, "kill");
1086
1343
}
1087
1344
}
1088
1345
}
1089
1346
1090
1347
/* Wait for any remaining child processes to terminate */
1091
do{
1348
do {
1092
1349
ret = wait(NULL);
1093
1350
} while(ret >= 0);
1094
1351
if(errno != ECHILD){
1095
perror("wait");
1352
error(0, errno, "wait");
1096
1353
}
1097
1354
1098
1355
free_plugin_list();
1099
1356
1100
1357
free(plugindir);
1358
free(pluginhelperdir);
1101
1359
free(argfile);
1102
1360
1103
1361
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0