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- Committer: teddy at recompile
- Date: 2020-12-03 20:30:45 UTC
- mto: This revision was merged to the branch mainline in revision 404.
- Revision ID: teddy@recompile.se-20201203203045-iqd6nq9y5nwalh1x
Minor fix of a test function
In dracut-module/password-agent, the test function
test_send_password_to_socket_EMSGSIZE() (which tests that the
send_password_to_socket() task function aborts properly when getting
EMSGSIZE when writing to the password socket), part of the test code
is supposed to find a message size which definitely does trigger
EMSGSIZE when send()ing to a socket. Without a "break" in the proper
place, however, the size given is always exactly 1024 bytes too large.
This is very probably not a problem, since a too large message will
still be too large if it is increased by 1024 bytes, and send(2) in
practice checks the size before reading the buffer. The biggest issue
would be if some version of send(2) would try to look at the last 1024
bytes of the message buffer before checking the message size; this
would then lead to a buffer over-read when running this test function.
(But even then there would be no security implications since the tests
are not run in the normal operation of the program.)
* dracut-module/password-agent.c
(test_send_password_to_socket_EMSGSIZE): Break out early when ssret
< 0 and errno == EMSGSIZE; don't allow loop to increase message_size
again.
In dracut-module/password-agent, the test function
test_send_password_to_socket_EMSGSIZE() (which tests that the
send_password_to_socket() task function aborts properly when getting
EMSGSIZE when writing to the password socket), part of the test code
is supposed to find a message size which definitely does trigger
EMSGSIZE when send()ing to a socket. Without a "break" in the proper
place, however, the size given is always exactly 1024 bytes too large.
This is very probably not a problem, since a too large message will
still be too large if it is increased by 1024 bytes, and send(2) in
practice checks the size before reading the buffer. The biggest issue
would be if some version of send(2) would try to look at the last 1024
bytes of the message buffer before checking the message size; this
would then lead to a buffer over-read when running this test function.
(But even then there would be no security implications since the tests
are not run in the normal operation of the program.)
* dracut-module/password-agent.c
(test_send_password_to_socket_EMSGSIZE): Break out early when ssret
< 0 and errno == EMSGSIZE; don't allow loop to increase message_size
again.
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2020 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
*/
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;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
138
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
126
143
127
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);
128
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
156
136
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (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);
156
196
/* Malloc check */
157
if(*array == NULL){
197
if(new_array == NULL){
158
198
return false;
159
199
}
200
*array = new_array;
160
201
/* Make a copy of the new string */
161
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
162
206
if(copy == NULL){
163
207
return false;
164
208
}
171
215
}
172
216
173
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
174
219
static bool add_argument(plugin *p, const char *arg){
175
220
if(p == NULL){
176
221
return false;
179
224
}
180
225
181
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
182
228
static bool add_environment(plugin *p, const char *def, bool replace){
183
229
if(p == NULL){
184
230
return false;
186
232
/* namelen = length of name of environment variable */
187
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
234
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
191
237
/* It already exists */
192
238
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
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){
195
244
return false;
196
245
}
197
*e = new;
198
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
199
248
}
200
249
return true;
201
250
}
203
252
return add_to_char_array(def, &(p->environ), &(p->envc));
204
253
}
205
254
255
#ifndef O_CLOEXEC
206
256
/*
207
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
258
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
260
*/
261
__attribute__((warn_unused_result))
211
262
static int set_cloexec_flag(int fd){
212
int ret = fcntl(fd, F_GETFD, 0);
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
264
/* If reading the flags failed, return error indication now. */
214
265
if(ret < 0){
215
266
return ret;
216
267
}
217
268
/* Store modified flag word in the descriptor. */
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
219
271
}
272
#endif /* not O_CLOEXEC */
220
273
221
274
222
275
/* Mark processes as completed when they exit, and save their exit
223
276
status. */
224
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
225
279
while(true){
226
280
plugin *proc = plugin_list;
227
281
int status;
231
285
break;
232
286
}
233
287
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
236
291
}
237
/* No child processes */
238
break;
292
error(0, errno, "waitpid");
239
293
}
240
294
241
295
/* A child exited, find it in process_list */
247
301
continue;
248
302
}
249
303
proc->status = status;
250
proc->completed = true;
304
proc->completed = 1;
251
305
}
306
errno = old_errno;
252
307
}
253
308
254
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
255
311
static bool print_out_password(const char *buffer, size_t length){
256
312
ssize_t ret;
257
313
for(size_t written = 0; written < length; written += (size_t)ret){
265
321
}
266
322
267
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
268
325
static void free_plugin(plugin *plugin_node){
269
326
270
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
271
328
free(*arg);
272
329
}
330
free(plugin_node->name);
273
331
free(plugin_node->argv);
274
332
for(char **env = plugin_node->environ; *env != NULL; env++){
275
333
free(*env);
276
334
}
277
335
free(plugin_node->environ);
278
336
free(plugin_node->buffer);
279
337
280
338
/* Removes the plugin from the singly-linked list */
281
339
if(plugin_node == plugin_list){
282
340
/* First one - simple */
302
360
303
361
int main(int argc, char *argv[]){
304
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
305
364
char *argfile = NULL;
306
365
FILE *conffp;
307
size_t d_name_len;
308
DIR *dir = NULL;
309
struct dirent *dirst;
366
struct dirent **direntries = NULL;
310
367
struct stat st;
311
368
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
369
int ret, maxfd = 0;
313
370
ssize_t sret;
314
intmax_t tmpmax;
315
371
uid_t uid = 65534;
316
372
gid_t gid = 65534;
317
373
bool debug = false;
321
377
.sa_flags = SA_NOCLDSTOP };
322
378
char **custom_argv = NULL;
323
379
int custom_argc = 0;
380
int dir_fd = -1;
324
381
325
382
/* Establish a signal handler */
326
383
sigemptyset(&sigchld_action.sa_mask);
327
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
328
385
if(ret == -1){
329
perror("sigaddset");
330
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
331
388
goto fallback;
332
389
}
333
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
334
391
if(ret == -1){
335
perror("sigaction");
336
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
337
394
goto fallback;
338
395
}
339
396
371
428
.doc = "Group ID the plugins will run as", .group = 3 },
372
429
{ .name = "debug", .key = 132,
373
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 },
374
444
{ .name = NULL }
375
445
};
376
446
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
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;
380
453
case 'g': /* --global-options */
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
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;
390
459
}
391
460
}
461
errno = 0;
392
462
}
393
463
break;
394
464
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
400
467
}
401
468
break;
402
469
case 'o': /* --options-for */
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
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;
422
491
}
423
492
break;
424
493
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
494
{
429
495
char *envdef = strchr(arg, ':');
430
496
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
431
499
break;
432
500
}
433
501
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
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;
436
510
}
437
511
}
438
512
break;
439
513
case 'd': /* --disable */
440
if(arg != NULL){
514
{
441
515
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
444
519
}
445
p->disabled = true;
446
520
}
447
521
break;
448
522
case 'e': /* --enable */
449
if(arg != NULL){
523
{
450
524
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
453
528
}
454
p->disabled = false;
455
529
}
456
530
break;
457
531
case 128: /* --plugin-dir */
458
532
free(plugindir);
459
533
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
534
if(plugindir != NULL){
535
errno = 0;
536
}
463
537
break;
464
538
case 129: /* --config-file */
465
539
/* This is already done by parse_opt_config_file() */
466
540
break;
467
541
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
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;
475
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
476
551
break;
477
552
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
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;
485
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
486
562
break;
487
563
case 132: /* --debug */
488
564
debug = true;
489
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;
490
589
/*
491
590
* When adding more options before this line, remember to also add a
492
591
* "case" to the "parse_opt_config_file" function below.
495
594
/* Cryptsetup always passes an argument, which is an empty
496
595
string if "none" was specified in /etc/crypttab. So if
497
596
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
597
if(arg[0] == '\0'){
598
break;
500
599
}
501
break;
502
case ARGP_KEY_END:
503
break;
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
504
605
default:
505
606
return ARGP_ERR_UNKNOWN;
506
607
}
507
return 0;
608
return errno; /* Set to 0 at start */
508
609
}
509
610
510
611
/* This option parser is the same as parse_opt() above, except it
511
612
ignores everything but the --config-file option. */
512
613
error_t parse_opt_config_file(int key, char *arg,
513
614
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
516
618
case 'g': /* --global-options */
517
619
case 'G': /* --global-env */
518
620
case 'o': /* --options-for */
524
626
case 129: /* --config-file */
525
627
free(argfile);
526
628
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
529
631
}
530
break;
632
break;
531
633
case 130: /* --userid */
532
634
case 131: /* --groupid */
533
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
534
640
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
641
break;
537
642
default:
538
643
return ARGP_ERR_UNKNOWN;
539
644
}
540
return 0;
645
return errno;
541
646
}
542
647
543
648
struct argp argp = { .options = options,
547
652
548
653
/* Parse using parse_opt_config_file() in order to get the custom
549
654
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
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;
554
669
goto fallback;
555
670
}
556
671
562
677
conffp = fopen(AFILE, "r");
563
678
} else {
564
679
conffp = fopen(argfile, "r");
565
}
680
}
566
681
if(conffp != NULL){
567
682
char *org_line = NULL;
568
683
char *p, *arg, *new_arg, *line;
569
684
size_t size = 0;
570
685
const char whitespace_delims[] = " \r\t\f\v\n";
571
686
const char comment_delim[] = "#";
572
687
573
688
custom_argc = 1;
574
689
custom_argv = malloc(sizeof(char*) * 2);
575
690
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
578
693
goto fallback;
579
694
}
580
695
custom_argv[0] = argv[0];
581
696
custom_argv[1] = NULL;
582
697
583
698
/* for each line in the config file, strip whitespace and ignore
584
699
commented text */
585
700
while(true){
587
702
if(sret == -1){
588
703
break;
589
704
}
590
705
591
706
line = org_line;
592
707
arg = strsep(&line, comment_delim);
593
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
711
}
597
712
new_arg = strdup(p);
598
713
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
601
716
free(org_line);
602
717
goto fallback;
603
718
}
604
719
605
720
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
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
}
613
744
}
614
745
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
616
747
}
617
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
}
618
757
free(org_line);
619
758
} else {
620
759
/* Check for harmful errors and go to fallback. Other errors might
621
760
not affect opening plugins */
622
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
625
764
goto fallback;
626
765
}
627
766
}
628
/* If there was any arguments from configuration file,
629
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 */
630
769
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
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;
636
784
goto fallback;
637
785
}
638
786
}
639
787
640
788
/* Parse actual command line arguments, to let them override the
641
789
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
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
}
647
823
}
648
824
649
825
if(debug){
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
651
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
652
828
p->name ? p->name : "Global", p->argc - 1);
653
829
for(char **a = p->argv; *a != NULL; a++){
660
836
}
661
837
}
662
838
663
/* 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
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
664
868
ret = setuid(uid);
665
869
if(ret == -1){
666
perror("setuid");
667
}
668
setgid(gid);
669
if(ret == -1){
670
perror("setgid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
686
874
{
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
694
919
}
695
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
696
931
}
697
932
698
933
FD_ZERO(&rfds_all);
699
934
700
935
/* Read and execute any executable in the plugin directory*/
701
while(true){
702
dirst = readdir(dir);
703
704
/* All directory entries have been processed */
705
if(dirst == NULL){
706
if(errno == EBADF){
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
709
goto fallback;
710
}
711
break;
712
}
713
714
d_name_len = strlen(dirst->d_name);
715
716
/* Ignore dotfiles, backup files and other junk */
717
{
718
bool bad_name = false;
719
720
const char const *bad_prefixes[] = { ".", "#", NULL };
721
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
".dpkg-old",
724
".dpkg-bak",
725
".dpkg-divert", NULL };
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
size_t pre_len = strlen(*pre);
728
if((d_name_len >= pre_len)
729
and strncmp((dirst->d_name), *pre, pre_len) == 0){
730
if(debug){
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad prefix %s\n", dirst->d_name, *pre);
733
}
734
bad_name = true;
735
break;
736
}
737
}
738
if(bad_name){
739
continue;
740
}
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
size_t suf_len = strlen(*suf);
743
if((d_name_len >= suf_len)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
745
== 0)){
746
if(debug){
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
748
" with bad suffix %s\n", dirst->d_name, *suf);
749
}
750
bad_name = true;
751
break;
752
}
753
}
754
755
if(bad_name){
756
continue;
757
}
758
}
759
760
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
766
if(ret < 0){
767
perror("asprintf");
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
768
942
continue;
769
943
}
770
771
ret = stat(filename, &st);
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
772
945
if(ret == -1){
773
perror("stat");
774
free(filename);
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
775
949
continue;
776
950
}
777
951
778
952
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
780
956
if(debug){
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
783
961
}
784
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
785
964
continue;
786
965
}
787
966
788
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
789
968
if(p == NULL){
790
perror("getplugin");
791
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
792
972
continue;
793
973
}
794
974
if(p->disabled){
795
975
if(debug){
796
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
797
dirst->d_name);
977
direntries[i]->d_name);
798
978
}
799
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
800
981
continue;
801
982
}
802
983
{
805
986
if(g != NULL){
806
987
for(char **a = g->argv + 1; *a != NULL; a++){
807
988
if(not add_argument(p, *a)){
808
perror("add_argument");
989
error(0, errno, "add_argument");
809
990
}
810
991
}
811
992
/* Add global environment variables */
812
993
for(char **e = g->environ; *e != NULL; e++){
813
994
if(not add_environment(p, *e, false)){
814
perror("add_environment");
995
error(0, errno, "add_environment");
815
996
}
816
997
}
817
998
}
818
999
}
819
/* If this plugin has any environment variables, we will call
820
using execve and need to duplicate the environment from this
821
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
822
1002
if(p->environ[0] != NULL){
823
1003
for(char **e = environ; *e != NULL; e++){
824
1004
if(not add_environment(p, *e, false)){
825
perror("add_environment");
1005
error(0, errno, "add_environment");
826
1006
}
827
1007
}
828
1008
}
829
1009
830
1010
int pipefd[2];
831
ret = pipe(pipefd);
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
832
1016
if(ret == -1){
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
835
goto fallback;
836
}
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
837
1032
/* Ask OS to automatic close the pipe on exec */
838
1033
ret = set_cloexec_flag(pipefd[0]);
839
1034
if(ret < 0){
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
842
1040
goto fallback;
843
1041
}
844
1042
ret = set_cloexec_flag(pipefd[1]);
845
1043
if(ret < 0){
846
perror("set_cloexec_flag");
847
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]);
848
1049
goto fallback;
849
1050
}
1051
#endif /* not O_CLOEXEC */
850
1052
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
852
1056
if(ret < 0){
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
855
1060
goto fallback;
856
1061
}
857
1062
/* Starting a new process to be watched */
858
pid_t pid = fork();
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
859
1067
if(pid == -1){
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
862
1075
goto fallback;
863
1076
}
864
1077
if(pid == 0){
865
1078
/* this is the child process */
866
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
867
1080
if(ret < 0){
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
870
1083
}
871
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
1085
if(ret < 0){
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
875
1088
}
876
1089
877
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
1091
if(ret == -1){
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
881
1094
}
882
1095
883
if(dirfd(dir) < 0){
884
/* If dir has no file descriptor, we could not set FD_CLOEXEC
885
above and must now close it manually here. */
886
closedir(dir);
887
}
888
if(p->environ[0] == NULL){
889
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
892
}
893
} else {
894
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
897
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
898
1102
}
899
1103
/* no return */
900
1104
}
901
1105
/* Parent process */
902
1106
close(pipefd[1]); /* Close unused write end of pipe */
903
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
905
1109
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
908
1114
if(ret < 0){
909
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
910
1116
}
911
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
912
1119
goto fallback;
913
1120
}
1121
free(direntries[i]);
914
1122
915
1123
new_plugin->pid = pid;
916
1124
new_plugin->fd = pipefd[0];
917
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
918
1131
/* Unblock SIGCHLD so signal handler can be run if this process
919
1132
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
921
1136
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
924
1139
goto fallback;
925
1140
}
926
1141
931
1146
}
932
1147
}
933
1148
934
closedir(dir);
935
dir = NULL;
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
936
1154
937
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
1156
if(p->pid != 0){
949
1167
while(plugin_list){
950
1168
fd_set rfds = rfds_all;
951
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
953
perror("select");
954
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
955
1173
goto fallback;
956
1174
}
957
1175
/* OK, now either a process completed, or something can be read
958
1176
from one of them */
959
1177
for(plugin *proc = plugin_list; proc != NULL;){
960
1178
/* Is this process completely done? */
961
if(proc->eof and proc->completed){
1179
if(proc->completed and proc->eof){
962
1180
/* Only accept the plugin output if it exited cleanly */
963
1181
if(not WIFEXITED(proc->status)
964
1182
or WEXITSTATUS(proc->status) != 0){
965
1183
/* Bad exit by plugin */
966
1184
967
1185
if(debug){
968
1186
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
971
1190
WEXITSTATUS(proc->status));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
976
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
979
1197
}
980
1198
}
981
1199
982
1200
/* Remove the plugin */
983
1201
FD_CLR(proc->fd, &rfds_all);
984
1202
985
1203
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
987
1208
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
990
1211
goto fallback;
991
1212
}
992
1213
995
1216
proc = next_plugin;
996
1217
997
1218
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
1000
1222
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1003
1225
goto fallback;
1004
1226
}
1005
1227
1015
1237
bool bret = print_out_password(proc->buffer,
1016
1238
proc->buffer_length);
1017
1239
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
1020
1242
}
1021
1243
goto fallback;
1022
1244
}
1029
1251
}
1030
1252
/* Before reading, make the process' data buffer large enough */
1031
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1037
1259
goto fallback;
1038
1260
}
1261
proc->buffer = new_buffer;
1039
1262
proc->buffer_size += BUFFER_SIZE;
1040
1263
}
1041
1264
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1044
1269
if(sret < 0){
1045
1270
/* Read error from this process; ignore the error */
1046
1271
proc = proc->next;
1054
1279
}
1055
1280
}
1056
1281
}
1057
1058
1282
1283
1059
1284
fallback:
1060
1285
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1062
1288
/* Fallback if all plugins failed, none are found or an error
1063
1289
occured */
1064
1290
bool bret;
1072
1298
}
1073
1299
bret = print_out_password(passwordbuffer, len);
1074
1300
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1077
1303
}
1078
1304
}
1079
1305
1080
1306
/* Restore old signal handler */
1081
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1308
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1085
1311
}
1086
1312
1087
1313
if(custom_argv != NULL){
1091
1317
free(custom_argv);
1092
1318
}
1093
1319
1094
if(dir != NULL){
1095
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1096
1324
}
1097
1325
1098
1326
/* Kill the processes */
1102
1330
ret = kill(p->pid, SIGTERM);
1103
1331
if(ret == -1 and errno != ESRCH){
1104
1332
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1333
error(0, errno, "kill");
1106
1334
}
1107
1335
}
1108
1336
}
1109
1337
1110
1338
/* Wait for any remaining child processes to terminate */
1111
do{
1339
do {
1112
1340
ret = wait(NULL);
1113
1341
} while(ret >= 0);
1114
1342
if(errno != ECHILD){
1115
perror("wait");
1343
error(0, errno, "wait");
1116
1344
}
1117
1345
1118
1346
free_plugin_list();
1119
1347
1120
1348
free(plugindir);
1349
free(pluginhelperdir);
1121
1350
free(argfile);
1122
1351
1123
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0