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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:
- 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 © 2008-2020 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 */
67
#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() */
68
75
69
76
#define BUFFER_SIZE 256
70
77
71
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
72
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
81
74
82
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
98
106
99
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
111
/* Check for existing plugin with that name */
103
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
113
if((p->name == name)
105
114
or (p->name and name and (strcmp(p->name, name) == 0))){
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
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);
111
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
118
133
free(new_plugin);
134
errno = e;
119
135
return NULL;
120
136
}
121
137
}
122
138
123
*new_plugin = (plugin) { .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
127
143
128
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);
129
147
if(new_plugin->argv == NULL){
148
int e = errno;
130
149
free(copy_name);
131
150
free(new_plugin);
151
errno = e;
132
152
return NULL;
133
153
}
134
154
new_plugin->argv[0] = copy_name;
135
155
new_plugin->argv[1] = NULL;
136
156
137
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
138
160
if(new_plugin->environ == NULL){
161
int e = errno;
139
162
free(copy_name);
140
163
free(new_plugin->argv);
141
164
free(new_plugin);
165
errno = e;
142
166
return NULL;
143
167
}
144
168
new_plugin->environ[0] = NULL;
149
173
}
150
174
151
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
152
177
static bool add_to_char_array(const char *new, char ***array,
153
178
int *len){
154
179
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (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);
157
196
/* Malloc check */
158
if(*array == NULL){
197
if(new_array == NULL){
159
198
return false;
160
199
}
200
*array = new_array;
161
201
/* Make a copy of the new string */
162
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
163
206
if(copy == NULL){
164
207
return false;
165
208
}
172
215
}
173
216
174
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
175
219
static bool add_argument(plugin *p, const char *arg){
176
220
if(p == NULL){
177
221
return false;
180
224
}
181
225
182
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
183
228
static bool add_environment(plugin *p, const char *def, bool replace){
184
229
if(p == NULL){
185
230
return false;
187
232
/* namelen = length of name of environment variable */
188
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
234
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
192
237
/* It already exists */
193
238
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
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){
196
244
return false;
197
245
}
198
*e = new;
199
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
200
248
}
201
249
return true;
202
250
}
204
252
return add_to_char_array(def, &(p->environ), &(p->envc));
205
253
}
206
254
255
#ifndef O_CLOEXEC
207
256
/*
208
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
258
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
260
*/
261
__attribute__((warn_unused_result))
212
262
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
264
/* If reading the flags failed, return error indication now. */
215
265
if(ret < 0){
216
266
return ret;
217
267
}
218
268
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
220
271
}
272
#endif /* not O_CLOEXEC */
221
273
222
274
223
275
/* Mark processes as completed when they exit, and save their exit
224
276
status. */
225
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
226
279
while(true){
227
280
plugin *proc = plugin_list;
228
281
int status;
232
285
break;
233
286
}
234
287
if(pid == -1){
235
if(errno != ECHILD){
236
perror("waitpid");
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
237
291
}
238
/* No child processes */
239
break;
292
error(0, errno, "waitpid");
240
293
}
241
294
242
295
/* A child exited, find it in process_list */
248
301
continue;
249
302
}
250
303
proc->status = status;
251
proc->completed = true;
304
proc->completed = 1;
252
305
}
306
errno = old_errno;
253
307
}
254
308
255
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
256
311
static bool print_out_password(const char *buffer, size_t length){
257
312
ssize_t ret;
258
313
for(size_t written = 0; written < length; written += (size_t)ret){
266
321
}
267
322
268
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
269
325
static void free_plugin(plugin *plugin_node){
270
326
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
272
328
free(*arg);
273
329
}
330
free(plugin_node->name);
274
331
free(plugin_node->argv);
275
332
for(char **env = plugin_node->environ; *env != NULL; env++){
276
333
free(*env);
277
334
}
278
335
free(plugin_node->environ);
279
336
free(plugin_node->buffer);
280
337
281
338
/* Removes the plugin from the singly-linked list */
282
339
if(plugin_node == plugin_list){
283
340
/* First one - simple */
303
360
304
361
int main(int argc, char *argv[]){
305
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
306
364
char *argfile = NULL;
307
365
FILE *conffp;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
366
struct dirent **direntries = NULL;
311
367
struct stat st;
312
368
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
369
int ret, maxfd = 0;
314
370
ssize_t sret;
315
intmax_t tmpmax;
316
371
uid_t uid = 65534;
317
372
gid_t gid = 65534;
318
373
bool debug = false;
322
377
.sa_flags = SA_NOCLDSTOP };
323
378
char **custom_argv = NULL;
324
379
int custom_argc = 0;
380
int dir_fd = -1;
325
381
326
382
/* Establish a signal handler */
327
383
sigemptyset(&sigchld_action.sa_mask);
328
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
329
385
if(ret == -1){
330
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
332
388
goto fallback;
333
389
}
334
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
335
391
if(ret == -1){
336
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
338
394
goto fallback;
339
395
}
340
396
372
428
.doc = "Group ID the plugins will run as", .group = 3 },
373
429
{ .name = "debug", .key = 132,
374
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 },
375
444
{ .name = NULL }
376
445
};
377
446
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
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;
381
453
case 'g': /* --global-options */
382
if(arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
391
459
}
392
460
}
461
errno = 0;
393
462
}
394
463
break;
395
464
case 'G': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
401
467
}
402
468
break;
403
469
case 'o': /* --options-for */
404
if(arg != NULL){
405
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
407
break;
408
}
409
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
411
break;
412
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
421
}
422
}
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;
423
491
}
424
492
break;
425
493
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
494
{
430
495
char *envdef = strchr(arg, ':');
431
496
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
432
499
break;
433
500
}
434
501
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
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;
437
510
}
438
511
}
439
512
break;
440
513
case 'd': /* --disable */
441
if(arg != NULL){
514
{
442
515
plugin *p = getplugin(arg);
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
445
519
}
446
p->disabled = true;
447
520
}
448
521
break;
449
522
case 'e': /* --enable */
450
if(arg != NULL){
523
{
451
524
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
454
528
}
455
p->disabled = false;
456
529
}
457
530
break;
458
531
case 128: /* --plugin-dir */
459
532
free(plugindir);
460
533
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
534
if(plugindir != NULL){
535
errno = 0;
536
}
464
537
break;
465
538
case 129: /* --config-file */
466
539
/* This is already done by parse_opt_config_file() */
467
540
break;
468
541
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
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;
476
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
477
551
break;
478
552
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
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;
486
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
487
562
break;
488
563
case 132: /* --debug */
489
564
debug = true;
490
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;
491
589
/*
492
590
* When adding more options before this line, remember to also add a
493
591
* "case" to the "parse_opt_config_file" function below.
496
594
/* Cryptsetup always passes an argument, which is an empty
497
595
string if "none" was specified in /etc/crypttab. So if
498
596
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
597
if(arg[0] == '\0'){
598
break;
501
599
}
502
break;
503
case ARGP_KEY_END:
504
break;
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
505
605
default:
506
606
return ARGP_ERR_UNKNOWN;
507
607
}
508
return 0;
608
return errno; /* Set to 0 at start */
509
609
}
510
610
511
611
/* This option parser is the same as parse_opt() above, except it
512
612
ignores everything but the --config-file option. */
513
613
error_t parse_opt_config_file(int key, char *arg,
514
614
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
517
618
case 'g': /* --global-options */
518
619
case 'G': /* --global-env */
519
620
case 'o': /* --options-for */
525
626
case 129: /* --config-file */
526
627
free(argfile);
527
628
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
530
631
}
531
break;
632
break;
532
633
case 130: /* --userid */
533
634
case 131: /* --groupid */
534
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
535
640
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
641
break;
538
642
default:
539
643
return ARGP_ERR_UNKNOWN;
540
644
}
541
return 0;
645
return errno;
542
646
}
543
647
544
648
struct argp argp = { .options = options,
548
652
549
653
/* Parse using parse_opt_config_file() in order to get the custom
550
654
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
553
fprintf(stderr, "Unknown error while parsing arguments\n");
554
exitstatus = EXIT_FAILURE;
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;
555
669
goto fallback;
556
670
}
557
671
563
677
conffp = fopen(AFILE, "r");
564
678
} else {
565
679
conffp = fopen(argfile, "r");
566
}
680
}
567
681
if(conffp != NULL){
568
682
char *org_line = NULL;
569
683
char *p, *arg, *new_arg, *line;
570
684
size_t size = 0;
571
685
const char whitespace_delims[] = " \r\t\f\v\n";
572
686
const char comment_delim[] = "#";
573
687
574
688
custom_argc = 1;
575
689
custom_argv = malloc(sizeof(char*) * 2);
576
690
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
579
693
goto fallback;
580
694
}
581
695
custom_argv[0] = argv[0];
582
696
custom_argv[1] = NULL;
583
697
584
698
/* for each line in the config file, strip whitespace and ignore
585
699
commented text */
586
700
while(true){
588
702
if(sret == -1){
589
703
break;
590
704
}
591
705
592
706
line = org_line;
593
707
arg = strsep(&line, comment_delim);
594
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
711
}
598
712
new_arg = strdup(p);
599
713
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
602
716
free(org_line);
603
717
goto fallback;
604
718
}
605
719
606
720
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
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
}
614
744
}
615
745
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
617
747
}
618
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
}
619
757
free(org_line);
620
758
} else {
621
759
/* Check for harmful errors and go to fallback. Other errors might
622
760
not affect opening plugins */
623
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
626
764
goto fallback;
627
765
}
628
766
}
629
/* If there was any arguments from configuration file,
630
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 */
631
769
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
635
fprintf(stderr, "Unknown error while parsing arguments\n");
636
exitstatus = EXIT_FAILURE;
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;
637
784
goto fallback;
638
785
}
639
786
}
640
787
641
788
/* Parse actual command line arguments, to let them override the
642
789
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
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
}
648
823
}
649
824
650
825
if(debug){
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
652
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
828
p->name ? p->name : "Global", p->argc - 1);
654
829
for(char **a = p->argv; *a != NULL; a++){
661
836
}
662
837
}
663
838
664
/* 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
}
665
877
ret = setuid(uid);
666
878
if(ret == -1){
667
perror("setuid");
668
}
669
setgid(gid);
670
if(ret == -1){
671
perror("setgid");
672
}
673
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
680
if(dir == NULL){
681
perror("Could not open plugin dir");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
684
}
685
686
/* Set the FD_CLOEXEC flag on the directory, if possible */
879
error(0, errno, "setuid");
880
}
881
882
/* Open plugin directory with close_on_exec flag */
687
883
{
688
int dir_fd = dirfd(dir);
689
if(dir_fd >= 0){
690
ret = set_cloexec_flag(dir_fd);
691
if(ret < 0){
692
perror("set_cloexec_flag");
693
exitstatus = EXIT_FAILURE;
694
goto fallback;
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;
695
928
}
696
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;
697
940
}
698
941
699
942
FD_ZERO(&rfds_all);
700
943
701
944
/* Read and execute any executable in the plugin directory*/
702
while(true){
703
dirst = readdir(dir);
704
705
/* All directory entries have been processed */
706
if(dirst == NULL){
707
if(errno == EBADF){
708
perror("readdir");
709
exitstatus = EXIT_FAILURE;
710
goto fallback;
711
}
712
break;
713
}
714
715
d_name_len = strlen(dirst->d_name);
716
717
/* Ignore dotfiles, backup files and other junk */
718
{
719
bool bad_name = false;
720
721
const char const *bad_prefixes[] = { ".", "#", NULL };
722
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
".dpkg-old",
725
".dpkg-bak",
726
".dpkg-divert", NULL };
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
size_t pre_len = strlen(*pre);
729
if((d_name_len >= pre_len)
730
and strncmp((dirst->d_name), *pre, pre_len) == 0){
731
if(debug){
732
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
733
" with bad prefix %s\n", dirst->d_name, *pre);
734
}
735
bad_name = true;
736
break;
737
}
738
}
739
if(bad_name){
740
continue;
741
}
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
size_t suf_len = strlen(*suf);
744
if((d_name_len >= suf_len)
745
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
746
== 0)){
747
if(debug){
748
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
749
" with bad suffix %s\n", dirst->d_name, *suf);
750
}
751
bad_name = true;
752
break;
753
}
754
}
755
756
if(bad_name){
757
continue;
758
}
759
}
760
761
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
767
if(ret < 0){
768
perror("asprintf");
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]);
769
951
continue;
770
952
}
771
772
ret = stat(filename, &st);
953
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
773
954
if(ret == -1){
774
perror("stat");
775
free(filename);
955
error(0, errno, "stat");
956
close(plugin_fd);
957
free(direntries[i]);
776
958
continue;
777
959
}
778
960
779
961
/* Ignore non-executable files */
780
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)){
781
965
if(debug){
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
" 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);
784
970
}
785
free(filename);
971
close(plugin_fd);
972
free(direntries[i]);
786
973
continue;
787
974
}
788
975
789
plugin *p = getplugin(dirst->d_name);
976
plugin *p = getplugin(direntries[i]->d_name);
790
977
if(p == NULL){
791
perror("getplugin");
792
free(filename);
978
error(0, errno, "getplugin");
979
close(plugin_fd);
980
free(direntries[i]);
793
981
continue;
794
982
}
795
983
if(p->disabled){
796
984
if(debug){
797
985
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
798
dirst->d_name);
986
direntries[i]->d_name);
799
987
}
800
free(filename);
988
close(plugin_fd);
989
free(direntries[i]);
801
990
continue;
802
991
}
803
992
{
806
995
if(g != NULL){
807
996
for(char **a = g->argv + 1; *a != NULL; a++){
808
997
if(not add_argument(p, *a)){
809
perror("add_argument");
998
error(0, errno, "add_argument");
810
999
}
811
1000
}
812
1001
/* Add global environment variables */
813
1002
for(char **e = g->environ; *e != NULL; e++){
814
1003
if(not add_environment(p, *e, false)){
815
perror("add_environment");
1004
error(0, errno, "add_environment");
816
1005
}
817
1006
}
818
1007
}
819
1008
}
820
/* If this plugin has any environment variables, we will call
821
using execve and need to duplicate the environment from this
822
process, too. */
1009
/* If this plugin has any environment variables, we need to
1010
duplicate the environment from this process, too. */
823
1011
if(p->environ[0] != NULL){
824
1012
for(char **e = environ; *e != NULL; e++){
825
1013
if(not add_environment(p, *e, false)){
826
perror("add_environment");
1014
error(0, errno, "add_environment");
827
1015
}
828
1016
}
829
1017
}
830
1018
831
1019
int pipefd[2];
832
ret = pipe(pipefd);
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 */
833
1025
if(ret == -1){
834
perror("pipe");
835
exitstatus = EXIT_FAILURE;
836
goto fallback;
837
}
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
838
1041
/* Ask OS to automatic close the pipe on exec */
839
1042
ret = set_cloexec_flag(pipefd[0]);
840
1043
if(ret < 0){
841
perror("set_cloexec_flag");
842
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]);
843
1049
goto fallback;
844
1050
}
845
1051
ret = set_cloexec_flag(pipefd[1]);
846
1052
if(ret < 0){
847
perror("set_cloexec_flag");
848
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]);
849
1058
goto fallback;
850
1059
}
1060
#endif /* not O_CLOEXEC */
851
1061
/* Block SIGCHLD until process is safely in process list */
852
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));
853
1065
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1066
error(0, errno, "sigprocmask");
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
856
1069
goto fallback;
857
1070
}
858
1071
/* Starting a new process to be watched */
859
pid_t pid = fork();
1072
pid_t pid;
1073
do {
1074
pid = fork();
1075
} while(pid == -1 and errno == EINTR);
860
1076
if(pid == -1){
861
perror("fork");
862
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]);
863
1084
goto fallback;
864
1085
}
865
1086
if(pid == 0){
866
1087
/* this is the child process */
867
1088
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
868
1089
if(ret < 0){
869
perror("sigaction");
870
_exit(EXIT_FAILURE);
1090
error(0, errno, "sigaction");
1091
_exit(EX_OSERR);
871
1092
}
872
1093
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
1094
if(ret < 0){
874
perror("sigprocmask");
875
_exit(EXIT_FAILURE);
1095
error(0, errno, "sigprocmask");
1096
_exit(EX_OSERR);
876
1097
}
877
1098
878
1099
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
1100
if(ret == -1){
880
perror("dup2");
881
_exit(EXIT_FAILURE);
1101
error(0, errno, "dup2");
1102
_exit(EX_OSERR);
882
1103
}
883
1104
884
if(dirfd(dir) < 0){
885
/* If dir has no file descriptor, we could not set FD_CLOEXEC
886
above and must now close it manually here. */
887
closedir(dir);
888
}
889
if(p->environ[0] == NULL){
890
if(execv(filename, p->argv) < 0){
891
perror("execv");
892
_exit(EXIT_FAILURE);
893
}
894
} else {
895
if(execve(filename, p->argv, p->environ) < 0){
896
perror("execve");
897
_exit(EXIT_FAILURE);
898
}
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);
899
1111
}
900
1112
/* no return */
901
1113
}
902
1114
/* Parent process */
903
1115
close(pipefd[1]); /* Close unused write end of pipe */
904
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
1116
close(plugin_fd);
1117
plugin *new_plugin = getplugin(direntries[i]->d_name);
906
1118
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1119
error(0, errno, "getplugin");
1120
ret = (int)(TEMP_FAILURE_RETRY
1121
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1122
NULL)));
909
1123
if(ret < 0){
910
perror("sigprocmask");
1124
error(0, errno, "sigprocmask");
911
1125
}
912
exitstatus = EXIT_FAILURE;
1126
exitstatus = EX_OSERR;
1127
free(direntries[i]);
913
1128
goto fallback;
914
1129
}
1130
free(direntries[i]);
915
1131
916
1132
new_plugin->pid = pid;
917
1133
new_plugin->fd = pipefd[0];
918
1134
1135
if(debug){
1136
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1137
new_plugin->name, (intmax_t) (new_plugin->pid));
1138
}
1139
919
1140
/* Unblock SIGCHLD so signal handler can be run if this process
920
1141
has already completed */
921
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));
922
1145
if(ret < 0){
923
perror("sigprocmask");
924
exitstatus = EXIT_FAILURE;
1146
error(0, errno, "sigprocmask");
1147
exitstatus = EX_OSERR;
925
1148
goto fallback;
926
1149
}
927
1150
932
1155
}
933
1156
}
934
1157
935
closedir(dir);
936
dir = NULL;
1158
free(direntries);
1159
direntries = NULL;
1160
close(dir_fd);
1161
dir_fd = -1;
1162
free_plugin(getplugin(NULL));
937
1163
938
1164
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
1165
if(p->pid != 0){
950
1176
while(plugin_list){
951
1177
fd_set rfds = rfds_all;
952
1178
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1179
if(select_ret == -1 and errno != EINTR){
1180
error(0, errno, "select");
1181
exitstatus = EX_OSERR;
956
1182
goto fallback;
957
1183
}
958
1184
/* OK, now either a process completed, or something can be read
959
1185
from one of them */
960
1186
for(plugin *proc = plugin_list; proc != NULL;){
961
1187
/* Is this process completely done? */
962
if(proc->eof and proc->completed){
1188
if(proc->completed and proc->eof){
963
1189
/* Only accept the plugin output if it exited cleanly */
964
1190
if(not WIFEXITED(proc->status)
965
1191
or WEXITSTATUS(proc->status) != 0){
966
1192
/* Bad exit by plugin */
967
1193
968
1194
if(debug){
969
1195
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1196
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1197
" status %d\n", proc->name,
1198
(intmax_t) (proc->pid),
972
1199
WEXITSTATUS(proc->status));
973
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
976
WTERMSIG(proc->status));
977
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
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)));
980
1206
}
981
1207
}
982
1208
983
1209
/* Remove the plugin */
984
1210
FD_CLR(proc->fd, &rfds_all);
985
1211
986
1212
/* Block signal while modifying process_list */
987
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));
988
1217
if(ret < 0){
989
perror("sigprocmask");
990
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "sigprocmask");
1219
exitstatus = EX_OSERR;
991
1220
goto fallback;
992
1221
}
993
1222
996
1225
proc = next_plugin;
997
1226
998
1227
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1228
ret = (int)(TEMP_FAILURE_RETRY
1229
(sigprocmask(SIG_UNBLOCK,
1230
&sigchld_action.sa_mask, NULL)));
1001
1231
if(ret < 0){
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
1004
1234
goto fallback;
1005
1235
}
1006
1236
1016
1246
bool bret = print_out_password(proc->buffer,
1017
1247
proc->buffer_length);
1018
1248
if(not bret){
1019
perror("print_out_password");
1020
exitstatus = EXIT_FAILURE;
1249
error(0, errno, "print_out_password");
1250
exitstatus = EX_IOERR;
1021
1251
}
1022
1252
goto fallback;
1023
1253
}
1030
1260
}
1031
1261
/* Before reading, make the process' data buffer large enough */
1032
1262
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
1036
perror("malloc");
1037
exitstatus = EXIT_FAILURE;
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;
1038
1268
goto fallback;
1039
1269
}
1270
proc->buffer = new_buffer;
1040
1271
proc->buffer_size += BUFFER_SIZE;
1041
1272
}
1042
1273
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1274
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1275
proc->buffer
1276
+ proc->buffer_length,
1277
BUFFER_SIZE));
1045
1278
if(sret < 0){
1046
1279
/* Read error from this process; ignore the error */
1047
1280
proc = proc->next;
1055
1288
}
1056
1289
}
1057
1290
}
1058
1059
1291
1292
1060
1293
fallback:
1061
1294
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1295
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1296
and exitstatus != EX_OK)){
1063
1297
/* Fallback if all plugins failed, none are found or an error
1064
1298
occured */
1065
1299
bool bret;
1073
1307
}
1074
1308
bret = print_out_password(passwordbuffer, len);
1075
1309
if(not bret){
1076
perror("print_out_password");
1077
exitstatus = EXIT_FAILURE;
1310
error(0, errno, "print_out_password");
1311
exitstatus = EX_IOERR;
1078
1312
}
1079
1313
}
1080
1314
1081
1315
/* Restore old signal handler */
1082
1316
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
1317
if(ret == -1){
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1318
error(0, errno, "sigaction");
1319
exitstatus = EX_OSERR;
1086
1320
}
1087
1321
1088
1322
if(custom_argv != NULL){
1092
1326
free(custom_argv);
1093
1327
}
1094
1328
1095
if(dir != NULL){
1096
closedir(dir);
1329
free(direntries);
1330
1331
if(dir_fd != -1){
1332
close(dir_fd);
1097
1333
}
1098
1334
1099
1335
/* Kill the processes */
1103
1339
ret = kill(p->pid, SIGTERM);
1104
1340
if(ret == -1 and errno != ESRCH){
1105
1341
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1342
error(0, errno, "kill");
1107
1343
}
1108
1344
}
1109
1345
}
1110
1346
1111
1347
/* Wait for any remaining child processes to terminate */
1112
do{
1348
do {
1113
1349
ret = wait(NULL);
1114
1350
} while(ret >= 0);
1115
1351
if(errno != ECHILD){
1116
perror("wait");
1352
error(0, errno, "wait");
1117
1353
}
1118
1354
1119
1355
free_plugin_list();
1120
1356
1121
1357
free(plugindir);
1358
free(pluginhelperdir);
1122
1359
free(argfile);
1123
1360
1124
1361
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0