To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 1239
- compare with another revision
- download diff
- download tarball
- view history from revision 1239
- Committer: Teddy Hogeborn
- Date: 2021-02-04 17:59:45 UTC
- Revision ID: teddy@recompile.se-20210204175945-8druo6d88ipc1z58
Fix issue with french translation
Initial white space was missing in both msgid and msgstr of the french
translation, leading to checking tools reporing an incomplete
translation. The string is a raw key id, and therefore did not need
translation, so this was never a user-visible issue.
* debian/po/fr.po: Add missing whitespace to the id and translation
for msgid " ${key_id}".
Initial white space was missing in both msgid and msgstr of the french
translation, leading to checking tools reporing an incomplete
translation. The string is a raw key id, and therefore did not need
translation, so this was never a user-visible issue.
* debian/po/fr.po: Add missing whitespace to the id and translation
for msgid " ${key_id}".
- files added:
- DBUS-API
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- etc-plugins.d-README
- 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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 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
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
26
42
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
52
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
66
89
67
90
#define BUFFER_SIZE 256
68
91
69
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
70
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
95
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
98
77
99
typedef struct plugin{
78
100
char *name; /* can be NULL or any plugin name */
81
103
char **environ;
82
104
int envc;
83
105
bool disabled;
84
106
85
107
/* Variables used for running processes*/
86
108
pid_t pid;
87
109
int fd;
89
111
size_t buffer_size;
90
112
size_t buffer_length;
91
113
bool eof;
92
volatile bool completed;
93
volatile int status;
114
volatile sig_atomic_t completed;
115
int status;
94
116
struct plugin *next;
95
117
} plugin;
96
118
98
120
99
121
/* Gets an existing plugin based on name,
100
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
101
124
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
125
/* Check for existing plugin with that name */
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
if((p->name == name)
128
or (p->name and name and (strcmp(p->name, name) == 0))){
106
129
return p;
107
130
}
108
131
}
109
132
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
137
if(new_plugin == NULL){
112
138
return NULL;
113
139
}
114
140
char *copy_name = NULL;
115
141
if(name != NULL){
116
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
117
145
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
118
149
return NULL;
119
150
}
120
151
}
121
152
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
126
157
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
161
if(new_plugin->argv == NULL){
162
int e = errno;
129
163
free(copy_name);
130
164
free(new_plugin);
165
errno = e;
131
166
return NULL;
132
167
}
133
168
new_plugin->argv[0] = copy_name;
134
169
new_plugin->argv[1] = NULL;
135
170
136
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
137
174
if(new_plugin->environ == NULL){
175
int e = errno;
138
176
free(copy_name);
139
177
free(new_plugin->argv);
140
178
free(new_plugin);
179
errno = e;
141
180
return NULL;
142
181
}
143
182
new_plugin->environ[0] = NULL;
148
187
}
149
188
150
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
151
191
static bool add_to_char_array(const char *new, char ***array,
152
192
int *len){
153
193
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
156
210
/* Malloc check */
157
if(*array == NULL){
211
if(new_array == NULL){
158
212
return false;
159
213
}
214
*array = new_array;
160
215
/* Make a copy of the new string */
161
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
162
220
if(copy == NULL){
163
221
return false;
164
222
}
171
229
}
172
230
173
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
174
233
static bool add_argument(plugin *p, const char *arg){
175
234
if(p == NULL){
176
235
return false;
179
238
}
180
239
181
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
182
242
static bool add_environment(plugin *p, const char *def, bool replace){
183
243
if(p == NULL){
184
244
return false;
186
246
/* namelen = length of name of environment variable */
187
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
248
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
191
251
/* It already exists */
192
252
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
195
258
return false;
196
259
}
197
*e = new;
198
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
199
262
}
200
263
return true;
201
264
}
203
266
return add_to_char_array(def, &(p->environ), &(p->envc));
204
267
}
205
268
269
#ifndef O_CLOEXEC
206
270
/*
207
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
272
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
274
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
275
__attribute__((warn_unused_result))
276
static int set_cloexec_flag(int fd){
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
278
/* If reading the flags failed, return error indication now. */
215
279
if(ret < 0){
216
280
return ret;
217
281
}
218
282
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
220
285
}
286
#endif /* not O_CLOEXEC */
221
287
222
288
223
289
/* Mark processes as completed when they exit, and save their exit
224
290
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
226
293
while(true){
227
294
plugin *proc = plugin_list;
228
295
int status;
232
299
break;
233
300
}
234
301
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
237
305
}
238
/* No child processes */
239
break;
306
error(0, errno, "waitpid");
240
307
}
241
308
242
309
/* A child exited, find it in process_list */
248
315
continue;
249
316
}
250
317
proc->status = status;
251
proc->completed = true;
318
proc->completed = 1;
252
319
}
320
errno = old_errno;
253
321
}
254
322
255
323
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
257
326
ssize_t ret;
258
327
for(size_t written = 0; written < length; written += (size_t)ret){
259
328
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
266
335
}
267
336
268
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
269
339
static void free_plugin(plugin *plugin_node){
270
340
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
272
342
free(*arg);
273
343
}
344
free(plugin_node->name);
274
345
free(plugin_node->argv);
275
346
for(char **env = plugin_node->environ; *env != NULL; env++){
276
347
free(*env);
277
348
}
278
349
free(plugin_node->environ);
279
350
free(plugin_node->buffer);
280
351
281
352
/* Removes the plugin from the singly-linked list */
282
353
if(plugin_node == plugin_list){
283
354
/* First one - simple */
303
374
304
375
int main(int argc, char *argv[]){
305
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
306
378
char *argfile = NULL;
307
379
FILE *conffp;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
380
struct dirent **direntries = NULL;
311
381
struct stat st;
312
382
fd_set rfds_all;
313
383
int ret, maxfd = 0;
384
ssize_t sret;
314
385
uid_t uid = 65534;
315
386
gid_t gid = 65534;
316
387
bool debug = false;
320
391
.sa_flags = SA_NOCLDSTOP };
321
392
char **custom_argv = NULL;
322
393
int custom_argc = 0;
394
int dir_fd = -1;
323
395
324
396
/* Establish a signal handler */
325
397
sigemptyset(&sigchld_action.sa_mask);
326
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
399
if(ret == -1){
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
330
402
goto fallback;
331
403
}
332
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
405
if(ret == -1){
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
336
408
goto fallback;
337
409
}
338
410
370
442
.doc = "Group ID the plugins will run as", .group = 3 },
371
443
{ .name = "debug", .key = 132,
372
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
373
458
{ .name = NULL }
374
459
};
375
460
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
379
467
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
389
473
}
390
474
}
475
errno = 0;
391
476
}
392
477
break;
393
478
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
399
481
}
400
482
break;
401
483
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
502
}
503
}
504
errno = 0;
421
505
}
422
506
break;
423
507
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
508
{
428
509
char *envdef = strchr(arg, ':');
429
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
430
513
break;
431
514
}
432
515
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
516
envdef++;
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
435
524
}
436
525
}
437
526
break;
438
527
case 'd': /* --disable */
439
if (arg != NULL){
528
{
440
529
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
443
533
}
444
p->disabled = true;
445
534
}
446
535
break;
447
536
case 'e': /* --enable */
448
if (arg != NULL){
537
{
449
538
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
452
542
}
453
p->disabled = false;
454
543
}
455
544
break;
456
545
case 128: /* --plugin-dir */
457
546
free(plugindir);
458
547
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
548
if(plugindir != NULL){
549
errno = 0;
550
}
462
551
break;
463
552
case 129: /* --config-file */
464
553
/* This is already done by parse_opt_config_file() */
465
554
break;
466
555
case 130: /* --userid */
467
uid = (uid_t)strtol(arg, NULL, 10);
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
468
565
break;
469
566
case 131: /* --groupid */
470
gid = (gid_t)strtol(arg, NULL, 10);
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
471
576
break;
472
577
case 132: /* --debug */
473
578
debug = true;
474
579
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
603
/*
604
* When adding more options before this line, remember to also add a
605
* "case" to the "parse_opt_config_file" function below.
606
*/
475
607
case ARGP_KEY_ARG:
476
608
/* Cryptsetup always passes an argument, which is an empty
477
609
string if "none" was specified in /etc/crypttab. So if
478
610
argument was empty, we ignore it silently. */
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
611
if(arg[0] == '\0'){
612
break;
481
613
}
482
break;
483
case ARGP_KEY_END:
484
break;
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
485
619
default:
486
620
return ARGP_ERR_UNKNOWN;
487
621
}
488
return 0;
622
return errno; /* Set to 0 at start */
489
623
}
490
624
491
625
/* This option parser is the same as parse_opt() above, except it
492
626
ignores everything but the --config-file option. */
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
497
632
case 'g': /* --global-options */
498
633
case 'G': /* --global-env */
499
634
case 'o': /* --options-for */
505
640
case 129: /* --config-file */
506
641
free(argfile);
507
642
argfile = strdup(arg);
508
if(argfile == NULL){
509
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
510
645
}
511
break;
646
break;
512
647
case 130: /* --userid */
513
648
case 131: /* --groupid */
514
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
515
654
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
517
655
break;
518
656
default:
519
657
return ARGP_ERR_UNKNOWN;
520
658
}
521
return 0;
659
return errno;
522
660
}
523
661
524
662
struct argp argp = { .options = options,
526
664
.args_doc = "",
527
665
.doc = "Mandos plugin runner -- Run plugins" };
528
666
529
/* Parse using the parse_opt_config_file in order to get the custom
667
/* Parse using parse_opt_config_file() in order to get the custom
530
668
config file location, if any. */
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
532
if (ret == ARGP_ERR_UNKNOWN){
533
fprintf(stderr, "Unknown error while parsing arguments\n");
534
exitstatus = EXIT_FAILURE;
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
535
683
goto fallback;
536
684
}
537
685
539
687
argp.parser = parse_opt;
540
688
541
689
/* Open the configfile if available */
542
if (argfile == NULL){
690
if(argfile == NULL){
543
691
conffp = fopen(AFILE, "r");
544
692
} else {
545
693
conffp = fopen(argfile, "r");
546
}
694
}
547
695
if(conffp != NULL){
548
696
char *org_line = NULL;
549
697
char *p, *arg, *new_arg, *line;
550
698
size_t size = 0;
551
ssize_t sret;
552
699
const char whitespace_delims[] = " \r\t\f\v\n";
553
700
const char comment_delim[] = "#";
554
701
555
702
custom_argc = 1;
556
703
custom_argv = malloc(sizeof(char*) * 2);
557
704
if(custom_argv == NULL){
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
560
707
goto fallback;
561
708
}
562
709
custom_argv[0] = argv[0];
563
710
custom_argv[1] = NULL;
564
711
565
712
/* for each line in the config file, strip whitespace and ignore
566
713
commented text */
567
714
while(true){
569
716
if(sret == -1){
570
717
break;
571
718
}
572
719
573
720
line = org_line;
574
721
arg = strsep(&line, comment_delim);
575
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
578
725
}
579
726
new_arg = strdup(p);
580
727
if(new_arg == NULL){
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
583
730
free(org_line);
584
731
goto fallback;
585
732
}
586
733
587
734
custom_argc += 1;
588
custom_argv = realloc(custom_argv, sizeof(char *)
589
* ((unsigned int) custom_argc + 1));
590
if(custom_argv == NULL){
591
perror("realloc");
592
exitstatus = EXIT_FAILURE;
593
free(org_line);
594
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
595
758
}
596
759
custom_argv[custom_argc-1] = new_arg;
597
custom_argv[custom_argc] = NULL;
760
custom_argv[custom_argc] = NULL;
598
761
}
599
762
}
763
do {
764
ret = fclose(conffp);
765
} while(ret == EOF and errno == EINTR);
766
if(ret == EOF){
767
error(0, errno, "fclose");
768
exitstatus = EX_IOERR;
769
goto fallback;
770
}
600
771
free(org_line);
601
772
} else {
602
773
/* Check for harmful errors and go to fallback. Other errors might
603
774
not affect opening plugins */
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
perror("fopen");
606
exitstatus = EXIT_FAILURE;
775
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
776
error(0, errno, "fopen");
777
exitstatus = EX_OSERR;
607
778
goto fallback;
608
779
}
609
780
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
781
/* If there were any arguments from the configuration file, pass
782
them to parser as command line arguments */
612
783
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
615
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
617
exitstatus = EXIT_FAILURE;
784
ret = argp_parse(&argp, custom_argc, custom_argv,
785
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
786
NULL, NULL);
787
switch(ret){
788
case 0:
789
break;
790
case ENOMEM:
791
default:
792
errno = ret;
793
error(0, errno, "argp_parse");
794
exitstatus = EX_OSERR;
795
goto fallback;
796
case EINVAL:
797
exitstatus = EX_CONFIG;
618
798
goto fallback;
619
799
}
620
800
}
621
801
622
802
/* Parse actual command line arguments, to let them override the
623
803
config file */
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
628
goto fallback;
804
ret = argp_parse(&argp, argc, argv,
805
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
806
NULL, NULL);
807
switch(ret){
808
case 0:
809
break;
810
case ENOMEM:
811
default:
812
errno = ret;
813
error(0, errno, "argp_parse");
814
exitstatus = EX_OSERR;
815
goto fallback;
816
case EINVAL:
817
exitstatus = EX_USAGE;
818
goto fallback;
819
}
820
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
836
}
629
837
}
630
838
631
839
if(debug){
632
for(plugin *p = plugin_list; p != NULL; p=p->next){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
633
841
fprintf(stderr, "Plugin: %s has %d arguments\n",
634
842
p->name ? p->name : "Global", p->argc - 1);
635
843
for(char **a = p->argv; *a != NULL; a++){
636
844
fprintf(stderr, "\tArg: %s\n", *a);
637
845
}
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
846
fprintf(stderr, "...and %d environment variables\n", p->envc);
639
847
for(char **a = p->environ; *a != NULL; a++){
640
848
fprintf(stderr, "\t%s\n", *a);
641
849
}
642
850
}
643
851
}
644
852
645
/* Strip permissions down to nobody */
853
if(getuid() == 0){
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
861
} else {
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
863
if(ret == -1){
864
error(0, errno, "fstat");
865
} else {
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
868
if(ret == -1){
869
error(0, errno, "fchown");
870
}
871
}
872
}
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
883
}
884
}
885
886
/* Lower permissions */
887
ret = setgid(gid);
888
if(ret == -1){
889
error(0, errno, "setgid");
890
}
646
891
ret = setuid(uid);
647
if (ret == -1){
648
perror("setuid");
649
}
650
setgid(gid);
651
if (ret == -1){
652
perror("setgid");
653
}
654
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
661
if(dir == NULL){
662
perror("Could not open plugin dir");
663
exitstatus = EXIT_FAILURE;
664
goto fallback;
665
}
666
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
892
if(ret == -1){
893
error(0, errno, "setuid");
894
}
895
896
/* Open plugin directory with close_on_exec flag */
668
897
{
669
int dir_fd = dirfd(dir);
670
if(dir_fd >= 0){
671
ret = set_cloexec_flag(dir_fd);
672
if(ret < 0){
673
perror("set_cloexec_flag");
674
exitstatus = EXIT_FAILURE;
675
goto fallback;
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
905
if(dir_fd == -1){
906
error(0, errno, "Could not open plugin dir");
907
exitstatus = EX_UNAVAILABLE;
908
goto fallback;
909
}
910
911
#ifndef O_CLOEXEC
912
/* Set the FD_CLOEXEC flag on the directory */
913
ret = set_cloexec_flag(dir_fd);
914
if(ret < 0){
915
error(0, errno, "set_cloexec_flag");
916
exitstatus = EX_OSERR;
917
goto fallback;
918
}
919
#endif /* O_CLOEXEC */
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
676
942
}
677
943
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
678
954
}
679
955
680
956
FD_ZERO(&rfds_all);
681
957
682
958
/* Read and execute any executable in the plugin directory*/
683
while(true){
684
dirst = readdir(dir);
685
686
/* All directory entries have been processed */
687
if(dirst == NULL){
688
if (errno == EBADF){
689
perror("readdir");
690
exitstatus = EXIT_FAILURE;
691
goto fallback;
692
}
693
break;
694
}
695
696
d_name_len = strlen(dirst->d_name);
697
698
/* Ignore dotfiles, backup files and other junk */
699
{
700
bool bad_name = false;
701
702
const char const *bad_prefixes[] = { ".", "#", NULL };
703
704
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
705
".dpkg-old",
706
".dpkg-divert", NULL };
707
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
708
size_t pre_len = strlen(*pre);
709
if((d_name_len >= pre_len)
710
and strncmp((dirst->d_name), *pre, pre_len) == 0){
711
if(debug){
712
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
713
" with bad prefix %s\n", dirst->d_name, *pre);
714
}
715
bad_name = true;
716
break;
717
}
718
}
719
if(bad_name){
720
continue;
721
}
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
size_t suf_len = strlen(*suf);
724
if((d_name_len >= suf_len)
725
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
726
== 0)){
727
if(debug){
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad suffix %s\n", dirst->d_name, *suf);
730
}
731
bad_name = true;
732
break;
733
}
734
}
735
736
if(bad_name){
737
continue;
738
}
739
}
740
741
char *filename;
742
if(plugindir == NULL){
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
744
} else {
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
}
747
if(ret < 0){
748
perror("asprintf");
749
continue;
750
}
751
752
ret = stat(filename, &st);
753
if (ret == -1){
754
perror("stat");
755
free(filename);
756
continue;
757
}
758
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
965
continue;
966
}
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
968
if(ret == -1){
969
error(0, errno, "stat");
970
close(plugin_fd);
971
free(direntries[i]);
972
continue;
973
}
974
759
975
/* Ignore non-executable files */
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
976
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
761
979
if(debug){
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
763
" with bad type or mode\n", filename);
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
764
984
}
765
free(filename);
985
close(plugin_fd);
986
free(direntries[i]);
766
987
continue;
767
988
}
768
989
769
plugin *p = getplugin(dirst->d_name);
990
plugin *p = getplugin(direntries[i]->d_name);
770
991
if(p == NULL){
771
perror("getplugin");
772
free(filename);
992
error(0, errno, "getplugin");
993
close(plugin_fd);
994
free(direntries[i]);
773
995
continue;
774
996
}
775
997
if(p->disabled){
776
998
if(debug){
777
999
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
778
dirst->d_name);
1000
direntries[i]->d_name);
779
1001
}
780
free(filename);
1002
close(plugin_fd);
1003
free(direntries[i]);
781
1004
continue;
782
1005
}
783
1006
{
786
1009
if(g != NULL){
787
1010
for(char **a = g->argv + 1; *a != NULL; a++){
788
1011
if(not add_argument(p, *a)){
789
perror("add_argument");
1012
error(0, errno, "add_argument");
790
1013
}
791
1014
}
792
1015
/* Add global environment variables */
793
1016
for(char **e = g->environ; *e != NULL; e++){
794
1017
if(not add_environment(p, *e, false)){
795
perror("add_environment");
1018
error(0, errno, "add_environment");
796
1019
}
797
1020
}
798
1021
}
799
1022
}
800
/* If this plugin has any environment variables, we will call
801
using execve and need to duplicate the environment from this
802
process, too. */
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
803
1025
if(p->environ[0] != NULL){
804
1026
for(char **e = environ; *e != NULL; e++){
805
1027
if(not add_environment(p, *e, false)){
806
perror("add_environment");
1028
error(0, errno, "add_environment");
807
1029
}
808
1030
}
809
1031
}
810
1032
811
1033
int pipefd[2];
812
ret = pipe(pipefd);
813
if (ret == -1){
814
perror("pipe");
815
exitstatus = EXIT_FAILURE;
816
goto fallback;
817
}
1034
#ifndef O_CLOEXEC
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
1039
if(ret == -1){
1040
error(0, errno, "pipe");
1041
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
818
1055
/* Ask OS to automatic close the pipe on exec */
819
1056
ret = set_cloexec_flag(pipefd[0]);
820
1057
if(ret < 0){
821
perror("set_cloexec_flag");
822
exitstatus = EXIT_FAILURE;
1058
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
823
1063
goto fallback;
824
1064
}
825
1065
ret = set_cloexec_flag(pipefd[1]);
826
1066
if(ret < 0){
827
perror("set_cloexec_flag");
828
exitstatus = EXIT_FAILURE;
1067
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
829
1072
goto fallback;
830
1073
}
1074
#endif /* not O_CLOEXEC */
831
1075
/* Block SIGCHLD until process is safely in process list */
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
&sigchld_action.sa_mask,
1078
NULL));
833
1079
if(ret < 0){
834
perror("sigprocmask");
835
exitstatus = EXIT_FAILURE;
1080
error(0, errno, "sigprocmask");
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
836
1083
goto fallback;
837
1084
}
838
1085
/* Starting a new process to be watched */
839
pid_t pid = fork();
1086
pid_t pid;
1087
do {
1088
pid = fork();
1089
} while(pid == -1 and errno == EINTR);
840
1090
if(pid == -1){
841
perror("fork");
842
exitstatus = EXIT_FAILURE;
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
843
1098
goto fallback;
844
1099
}
845
1100
if(pid == 0){
846
1101
/* this is the child process */
847
1102
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
848
1103
if(ret < 0){
849
perror("sigaction");
850
_exit(EXIT_FAILURE);
1104
error(0, errno, "sigaction");
1105
_exit(EX_OSERR);
851
1106
}
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
853
1108
if(ret < 0){
854
perror("sigprocmask");
855
_exit(EXIT_FAILURE);
1109
error(0, errno, "sigprocmask");
1110
_exit(EX_OSERR);
856
1111
}
857
1112
858
1113
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
859
1114
if(ret == -1){
860
perror("dup2");
861
_exit(EXIT_FAILURE);
1115
error(0, errno, "dup2");
1116
_exit(EX_OSERR);
862
1117
}
863
1118
864
if(dirfd(dir) < 0){
865
/* If dir has no file descriptor, we could not set FD_CLOEXEC
866
above and must now close it manually here. */
867
closedir(dir);
868
}
869
if(p->environ[0] == NULL){
870
if(execv(filename, p->argv) < 0){
871
perror("execv");
872
_exit(EXIT_FAILURE);
873
}
874
} else {
875
if(execve(filename, p->argv, p->environ) < 0){
876
perror("execve");
877
_exit(EXIT_FAILURE);
878
}
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
879
1125
}
880
1126
/* no return */
881
1127
}
882
1128
/* Parent process */
883
1129
close(pipefd[1]); /* Close unused write end of pipe */
884
free(filename);
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
perror("getplugin");
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
1132
if(new_plugin == NULL){
1133
error(0, errno, "getplugin");
1134
ret = (int)(TEMP_FAILURE_RETRY
1135
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1136
NULL)));
889
1137
if(ret < 0){
890
perror("sigprocmask");
1138
error(0, errno, "sigprocmask");
891
1139
}
892
exitstatus = EXIT_FAILURE;
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
893
1142
goto fallback;
894
1143
}
1144
free(direntries[i]);
895
1145
896
1146
new_plugin->pid = pid;
897
1147
new_plugin->fd = pipefd[0];
898
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
899
1154
/* Unblock SIGCHLD so signal handler can be run if this process
900
1155
has already completed */
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1157
&sigchld_action.sa_mask,
1158
NULL));
902
1159
if(ret < 0){
903
perror("sigprocmask");
904
exitstatus = EXIT_FAILURE;
1160
error(0, errno, "sigprocmask");
1161
exitstatus = EX_OSERR;
905
1162
goto fallback;
906
1163
}
907
1164
908
1165
FD_SET(new_plugin->fd, &rfds_all);
909
1166
910
if (maxfd < new_plugin->fd){
1167
if(maxfd < new_plugin->fd){
911
1168
maxfd = new_plugin->fd;
912
1169
}
913
914
1170
}
915
1171
916
closedir(dir);
917
dir = NULL;
918
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
1176
free_plugin(getplugin(NULL));
1177
919
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
920
1179
if(p->pid != 0){
921
1180
break;
926
1185
free_plugin_list();
927
1186
}
928
1187
}
929
1188
930
1189
/* Main loop while running plugins exist */
931
1190
while(plugin_list){
932
1191
fd_set rfds = rfds_all;
933
1192
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
if (select_ret == -1){
935
perror("select");
936
exitstatus = EXIT_FAILURE;
1193
if(select_ret == -1 and errno != EINTR){
1194
error(0, errno, "select");
1195
exitstatus = EX_OSERR;
937
1196
goto fallback;
938
1197
}
939
1198
/* OK, now either a process completed, or something can be read
940
1199
from one of them */
941
1200
for(plugin *proc = plugin_list; proc != NULL;){
942
1201
/* Is this process completely done? */
943
if(proc->eof and proc->completed){
1202
if(proc->completed and proc->eof){
944
1203
/* Only accept the plugin output if it exited cleanly */
945
1204
if(not WIFEXITED(proc->status)
946
1205
or WEXITSTATUS(proc->status) != 0){
947
1206
/* Bad exit by plugin */
948
1207
949
1208
if(debug){
950
1209
if(WIFEXITED(proc->status)){
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1210
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1211
" status %d\n", proc->name,
1212
(intmax_t) (proc->pid),
953
1213
WEXITSTATUS(proc->status));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(proc->status));
958
} else if(WCOREDUMP(proc->status)){
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1214
} else if(WIFSIGNALED(proc->status)){
1215
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1216
" signal %d: %s\n", proc->name,
1217
(intmax_t) (proc->pid),
1218
WTERMSIG(proc->status),
1219
strsignal(WTERMSIG(proc->status)));
961
1220
}
962
1221
}
963
1222
964
1223
/* Remove the plugin */
965
1224
FD_CLR(proc->fd, &rfds_all);
966
1225
967
1226
/* Block signal while modifying process_list */
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
978
if(ret < 0){
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1228
(SIG_BLOCK,
1229
&sigchld_action.sa_mask,
1230
NULL));
1231
if(ret < 0){
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
1234
goto fallback;
986
1235
}
987
1236
988
1237
plugin *next_plugin = proc->next;
989
1238
free_plugin(proc);
990
1239
proc = next_plugin;
1240
1241
/* We are done modifying process list, so unblock signal */
1242
ret = (int)(TEMP_FAILURE_RETRY
1243
(sigprocmask(SIG_UNBLOCK,
1244
&sigchld_action.sa_mask, NULL)));
1245
if(ret < 0){
1246
error(0, errno, "sigprocmask");
1247
exitstatus = EX_OSERR;
1248
goto fallback;
1249
}
1250
1251
if(plugin_list == NULL){
1252
break;
1253
}
1254
991
1255
continue;
992
1256
}
993
1257
994
1258
/* This process exited nicely, so print its buffer */
995
1259
996
1260
bool bret = print_out_password(proc->buffer,
997
1261
proc->buffer_length);
998
1262
if(not bret){
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1263
error(0, errno, "print_out_password");
1264
exitstatus = EX_IOERR;
1001
1265
}
1002
1266
goto fallback;
1003
1267
}
1010
1274
}
1011
1275
/* Before reading, make the process' data buffer large enough */
1012
1276
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1013
proc->buffer = realloc(proc->buffer, proc->buffer_size
1014
+ (size_t) BUFFER_SIZE);
1015
if (proc->buffer == NULL){
1016
perror("malloc");
1017
exitstatus = EXIT_FAILURE;
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1280
error(0, errno, "malloc");
1281
exitstatus = EX_OSERR;
1018
1282
goto fallback;
1019
1283
}
1284
proc->buffer = new_buffer;
1020
1285
proc->buffer_size += BUFFER_SIZE;
1021
1286
}
1022
1287
/* Read from the process */
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1288
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
proc->buffer
1290
+ proc->buffer_length,
1291
BUFFER_SIZE));
1292
if(sret < 0){
1026
1293
/* Read error from this process; ignore the error */
1027
1294
proc = proc->next;
1028
1295
continue;
1029
1296
}
1030
if(ret == 0){
1297
if(sret == 0){
1031
1298
/* got EOF */
1032
1299
proc->eof = true;
1033
1300
} else {
1034
proc->buffer_length += (size_t) ret;
1301
proc->buffer_length += (size_t) sret;
1035
1302
}
1036
1303
}
1037
1304
}
1038
1039
1305
1306
1040
1307
fallback:
1041
1308
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1309
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1310
and exitstatus != EX_OK)){
1043
1311
/* Fallback if all plugins failed, none are found or an error
1044
1312
occured */
1045
1313
bool bret;
1053
1321
}
1054
1322
bret = print_out_password(passwordbuffer, len);
1055
1323
if(not bret){
1056
perror("print_out_password");
1057
exitstatus = EXIT_FAILURE;
1324
error(0, errno, "print_out_password");
1325
exitstatus = EX_IOERR;
1058
1326
}
1059
1327
}
1060
1328
1061
1329
/* Restore old signal handler */
1062
1330
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1063
1331
if(ret == -1){
1064
perror("sigaction");
1065
exitstatus = EXIT_FAILURE;
1332
error(0, errno, "sigaction");
1333
exitstatus = EX_OSERR;
1066
1334
}
1067
1335
1068
1336
if(custom_argv != NULL){
1069
1337
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1070
1338
free(*arg);
1072
1340
free(custom_argv);
1073
1341
}
1074
1342
1075
if(dir != NULL){
1076
closedir(dir);
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1077
1347
}
1078
1348
1079
/* Free the process list and kill the processes */
1349
/* Kill the processes */
1080
1350
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
1351
if(p->pid != 0){
1082
1352
close(p->fd);
1083
1353
ret = kill(p->pid, SIGTERM);
1084
1354
if(ret == -1 and errno != ESRCH){
1085
1355
/* Set-uid proccesses might not get closed */
1086
perror("kill");
1356
error(0, errno, "kill");
1087
1357
}
1088
1358
}
1089
1359
}
1090
1360
1091
1361
/* Wait for any remaining child processes to terminate */
1092
do{
1362
do {
1093
1363
ret = wait(NULL);
1094
1364
} while(ret >= 0);
1095
1365
if(errno != ECHILD){
1096
perror("wait");
1366
error(0, errno, "wait");
1097
1367
}
1098
1368
1099
1369
free_plugin_list();
1100
1370
1101
1371
free(plugindir);
1372
free(pluginhelperdir);
1102
1373
free(argfile);
1103
1374
1104
1375
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0