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- Committer: Teddy Hogeborn
- Date: 2016-03-04 22:07:35 UTC
- Revision ID: teddy@recompile.se-20160304220735-4xeeqt5p4nhw5cuh
Restrict the Mandos server daemon in the systemd service file.
* mandos.service ([Service]/ProtectSystem): Set to "full".
([Service]/PrivateTmp, [Service]/PrivateDevices,
[Service]/ProtectHome): Set to "yes".
([Service]/CapabilityBoundingSet): Set to "CAP_SETUID
CAP_DAC_OVERRIDE CAP_NET_RAW".
* mandos.service ([Service]/ProtectSystem): Set to "full".
([Service]/PrivateTmp, [Service]/PrivateDevices,
[Service]/ProtectHome): Set to "yes".
([Service]/CapabilityBoundingSet): Set to "CAP_SETUID
CAP_DAC_OVERRIDE CAP_NET_RAW".
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- debian/mandos-client.config
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC, pipe2() */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
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() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#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() */
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
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
84
75
85
typedef struct plugin{
76
86
char *name; /* can be NULL or any plugin name */
79
89
char **environ;
80
90
int envc;
81
91
bool disabled;
82
92
83
93
/* Variables used for running processes*/
84
94
pid_t pid;
85
95
int fd;
87
97
size_t buffer_size;
88
98
size_t buffer_length;
89
99
bool eof;
90
volatile bool completed;
91
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
92
102
struct plugin *next;
93
103
} plugin;
94
104
96
106
97
107
/* Gets an existing plugin based on name,
98
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
99
110
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
102
if ((p->name == name)
103
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
104
115
return p;
105
116
}
106
117
}
107
118
/* Create a new plugin */
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
110
124
return NULL;
111
125
}
112
126
char *copy_name = NULL;
113
127
if(name != NULL){
114
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
115
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
116
135
return NULL;
117
136
}
118
137
}
119
138
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
124
143
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
127
149
free(copy_name);
128
150
free(new_plugin);
151
errno = e;
129
152
return NULL;
130
153
}
131
154
new_plugin->argv[0] = copy_name;
132
155
new_plugin->argv[1] = NULL;
133
156
134
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
135
160
if(new_plugin->environ == NULL){
161
int e = errno;
136
162
free(copy_name);
137
163
free(new_plugin->argv);
138
164
free(new_plugin);
165
errno = e;
139
166
return NULL;
140
167
}
141
168
new_plugin->environ[0] = NULL;
146
173
}
147
174
148
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
149
177
static bool add_to_char_array(const char *new, char ***array,
150
178
int *len){
151
179
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
154
185
/* Malloc check */
155
if(*array == NULL){
186
if(new_array == NULL){
156
187
return false;
157
188
}
189
*array = new_array;
158
190
/* Make a copy of the new string */
159
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
160
195
if(copy == NULL){
161
196
return false;
162
197
}
169
204
}
170
205
171
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
172
208
static bool add_argument(plugin *p, const char *arg){
173
209
if(p == NULL){
174
210
return false;
177
213
}
178
214
179
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
180
217
static bool add_environment(plugin *p, const char *def, bool replace){
181
218
if(p == NULL){
182
219
return false;
184
221
/* namelen = length of name of environment variable */
185
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
223
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
189
226
/* It already exists */
190
227
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
193
233
return false;
194
234
}
195
*e = new;
196
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
197
237
}
198
238
return true;
199
239
}
201
241
return add_to_char_array(def, &(p->environ), &(p->envc));
202
242
}
203
243
244
#ifndef O_CLOEXEC
204
245
/*
205
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
247
* Descriptor Flags".
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
249
*/
250
__attribute__((warn_unused_result))
209
251
static int set_cloexec_flag(int fd){
210
int ret = fcntl(fd, F_GETFD, 0);
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
253
/* If reading the flags failed, return error indication now. */
212
254
if(ret < 0){
213
255
return ret;
214
256
}
215
257
/* Store modified flag word in the descriptor. */
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
217
260
}
261
#endif /* not O_CLOEXEC */
218
262
219
263
220
264
/* Mark processes as completed when they exit, and save their exit
221
265
status. */
222
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
223
268
while(true){
224
269
plugin *proc = plugin_list;
225
270
int status;
229
274
break;
230
275
}
231
276
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
234
280
}
235
/* No child processes */
236
break;
281
error(0, errno, "waitpid");
237
282
}
238
283
239
284
/* A child exited, find it in process_list */
245
290
continue;
246
291
}
247
292
proc->status = status;
248
proc->completed = true;
293
proc->completed = 1;
249
294
}
295
errno = old_errno;
250
296
}
251
297
252
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
253
300
static bool print_out_password(const char *buffer, size_t length){
254
301
ssize_t ret;
255
302
for(size_t written = 0; written < length; written += (size_t)ret){
263
310
}
264
311
265
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
266
314
static void free_plugin(plugin *plugin_node){
267
315
268
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
322
}
275
323
free(plugin_node->environ);
276
324
free(plugin_node->buffer);
277
325
278
326
/* Removes the plugin from the singly-linked list */
279
327
if(plugin_node == plugin_list){
280
328
/* First one - simple */
300
348
301
349
int main(int argc, char *argv[]){
302
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
303
352
char *argfile = NULL;
304
353
FILE *conffp;
305
size_t d_name_len;
306
DIR *dir = NULL;
307
struct dirent *dirst;
354
struct dirent **direntries = NULL;
308
355
struct stat st;
309
356
fd_set rfds_all;
310
357
int ret, maxfd = 0;
358
ssize_t sret;
311
359
uid_t uid = 65534;
312
360
gid_t gid = 65534;
313
361
bool debug = false;
317
365
.sa_flags = SA_NOCLDSTOP };
318
366
char **custom_argv = NULL;
319
367
int custom_argc = 0;
368
int dir_fd = -1;
320
369
321
370
/* Establish a signal handler */
322
371
sigemptyset(&sigchld_action.sa_mask);
323
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
373
if(ret == -1){
325
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
327
376
goto fallback;
328
377
}
329
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
379
if(ret == -1){
331
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
333
382
goto fallback;
334
383
}
335
384
367
416
.doc = "Group ID the plugins will run as", .group = 3 },
368
417
{ .name = "debug", .key = 132,
369
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
370
432
{ .name = NULL }
371
433
};
372
434
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
376
441
case 'g': /* --global-options */
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
381
continue;
382
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
386
447
}
387
448
}
449
errno = 0;
388
450
}
389
451
break;
390
452
case 'G': /* --global-env */
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
396
455
}
397
456
break;
398
457
case 'o': /* --options-for */
399
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
402
break;
403
}
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
406
break;
407
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
416
}
417
}
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
418
479
}
419
480
break;
420
481
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
482
{
425
483
char *envdef = strchr(arg, ':');
426
484
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
427
487
break;
428
488
}
429
489
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
432
498
}
433
499
}
434
500
break;
435
501
case 'd': /* --disable */
436
if (arg != NULL){
502
{
437
503
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
440
507
}
441
p->disabled = true;
442
508
}
443
509
break;
444
510
case 'e': /* --enable */
445
if (arg != NULL){
511
{
446
512
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
449
516
}
450
p->disabled = false;
451
517
}
452
518
break;
453
519
case 128: /* --plugin-dir */
454
520
free(plugindir);
455
521
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
522
if(plugindir != NULL){
523
errno = 0;
524
}
459
525
break;
460
526
case 129: /* --config-file */
461
527
/* This is already done by parse_opt_config_file() */
462
528
break;
463
529
case 130: /* --userid */
464
uid = (uid_t)strtol(arg, NULL, 10);
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
465
539
break;
466
540
case 131: /* --groupid */
467
gid = (gid_t)strtol(arg, NULL, 10);
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
468
550
break;
469
551
case 132: /* --debug */
470
552
debug = true;
471
553
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
472
579
case ARGP_KEY_ARG:
473
580
/* Cryptsetup always passes an argument, which is an empty
474
581
string if "none" was specified in /etc/crypttab. So if
475
582
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
583
if(arg[0] == '\0'){
584
break;
478
585
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
586
default:
483
587
return ARGP_ERR_UNKNOWN;
484
588
}
485
return 0;
589
return errno; /* Set to 0 at start */
486
590
}
487
591
488
592
/* This option parser is the same as parse_opt() above, except it
489
593
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
494
599
case 'g': /* --global-options */
495
600
case 'G': /* --global-env */
496
601
case 'o': /* --options-for */
502
607
case 129: /* --config-file */
503
608
free(argfile);
504
609
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
610
if(argfile != NULL){
611
errno = 0;
507
612
}
508
break;
613
break;
509
614
case 130: /* --userid */
510
615
case 131: /* --groupid */
511
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
512
621
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
622
break;
515
623
default:
516
624
return ARGP_ERR_UNKNOWN;
517
625
}
518
return 0;
626
return errno;
519
627
}
520
628
521
629
struct argp argp = { .options = options,
523
631
.args_doc = "",
524
632
.doc = "Mandos plugin runner -- Run plugins" };
525
633
526
/* Parse using the parse_opt_config_file in order to get the custom
634
/* Parse using parse_opt_config_file() in order to get the custom
527
635
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
530
fprintf(stderr, "Unknown error while parsing arguments\n");
531
exitstatus = EXIT_FAILURE;
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
532
650
goto fallback;
533
651
}
534
652
536
654
argp.parser = parse_opt;
537
655
538
656
/* Open the configfile if available */
539
if (argfile == NULL){
657
if(argfile == NULL){
540
658
conffp = fopen(AFILE, "r");
541
659
} else {
542
660
conffp = fopen(argfile, "r");
543
}
661
}
544
662
if(conffp != NULL){
545
663
char *org_line = NULL;
546
664
char *p, *arg, *new_arg, *line;
547
665
size_t size = 0;
548
ssize_t sret;
549
666
const char whitespace_delims[] = " \r\t\f\v\n";
550
667
const char comment_delim[] = "#";
551
668
552
669
custom_argc = 1;
553
670
custom_argv = malloc(sizeof(char*) * 2);
554
671
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
557
674
goto fallback;
558
675
}
559
676
custom_argv[0] = argv[0];
560
677
custom_argv[1] = NULL;
561
678
562
679
/* for each line in the config file, strip whitespace and ignore
563
680
commented text */
564
681
while(true){
566
683
if(sret == -1){
567
684
break;
568
685
}
569
686
570
687
line = org_line;
571
688
arg = strsep(&line, comment_delim);
572
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
575
692
}
576
693
new_arg = strdup(p);
577
694
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
580
697
free(org_line);
581
698
goto fallback;
582
699
}
583
700
584
701
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
592
714
}
593
715
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
716
custom_argv[custom_argc] = NULL;
595
717
}
596
718
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
597
727
free(org_line);
598
728
} else {
599
729
/* Check for harmful errors and go to fallback. Other errors might
600
730
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
604
734
goto fallback;
605
735
}
606
736
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
609
739
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
615
754
goto fallback;
616
755
}
617
756
}
618
757
619
758
/* Parse actual command line arguments, to let them override the
620
759
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
792
}
626
793
}
627
794
628
795
if(debug){
632
799
for(char **a = p->argv; *a != NULL; a++){
633
800
fprintf(stderr, "\tArg: %s\n", *a);
634
801
}
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
803
for(char **a = p->environ; *a != NULL; a++){
637
804
fprintf(stderr, "\t%s\n", *a);
638
805
}
639
806
}
640
807
}
641
808
642
/* Strip permissions down to nobody */
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
643
838
ret = setuid(uid);
644
if (ret == -1){
645
perror("setuid");
646
}
647
setgid(gid);
648
if (ret == -1){
649
perror("setgid");
650
}
651
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
658
if(dir == NULL){
659
perror("Could not open plugin dir");
660
exitstatus = EXIT_FAILURE;
661
goto fallback;
662
}
663
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
839
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
665
844
{
666
int dir_fd = dirfd(dir);
667
if(dir_fd >= 0){
668
ret = set_cloexec_flag(dir_fd);
669
if(ret < 0){
670
perror("set_cloexec_flag");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
673
889
}
674
890
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
675
901
}
676
902
677
903
FD_ZERO(&rfds_all);
678
904
679
905
/* Read and execute any executable in the plugin directory*/
680
while(true){
681
dirst = readdir(dir);
682
683
/* All directory entries have been processed */
684
if(dirst == NULL){
685
if (errno == EBADF){
686
perror("readdir");
687
exitstatus = EXIT_FAILURE;
688
goto fallback;
689
}
690
break;
691
}
692
693
d_name_len = strlen(dirst->d_name);
694
695
/* Ignore dotfiles, backup files and other junk */
696
{
697
bool bad_name = false;
698
699
const char const *bad_prefixes[] = { ".", "#", NULL };
700
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
702
".dpkg-old",
703
".dpkg-divert", NULL };
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
705
size_t pre_len = strlen(*pre);
706
if((d_name_len >= pre_len)
707
and strncmp((dirst->d_name), *pre, pre_len) == 0){
708
if(debug){
709
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
710
" with bad prefix %s\n", dirst->d_name, *pre);
711
}
712
bad_name = true;
713
break;
714
}
715
}
716
if(bad_name){
717
continue;
718
}
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
size_t suf_len = strlen(*suf);
721
if((d_name_len >= suf_len)
722
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
723
== 0)){
724
if(debug){
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
726
" with bad suffix %s\n", dirst->d_name, *suf);
727
}
728
bad_name = true;
729
break;
730
}
731
}
732
733
if(bad_name){
734
continue;
735
}
736
}
737
738
char *filename;
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
744
if(ret < 0){
745
perror("asprintf");
746
continue;
747
}
748
749
ret = stat(filename, &st);
750
if (ret == -1){
751
perror("stat");
752
free(filename);
753
continue;
754
}
755
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
912
continue;
913
}
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
if(ret == -1){
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
919
continue;
920
}
921
756
922
/* Ignore non-executable files */
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
758
926
if(debug){
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
760
" with bad type or mode\n", filename);
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
761
931
}
762
free(filename);
932
close(plugin_fd);
933
free(direntries[i]);
763
934
continue;
764
935
}
765
936
766
plugin *p = getplugin(dirst->d_name);
937
plugin *p = getplugin(direntries[i]->d_name);
767
938
if(p == NULL){
768
perror("getplugin");
769
free(filename);
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
770
942
continue;
771
943
}
772
944
if(p->disabled){
773
945
if(debug){
774
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
775
dirst->d_name);
947
direntries[i]->d_name);
776
948
}
777
free(filename);
949
close(plugin_fd);
950
free(direntries[i]);
778
951
continue;
779
952
}
780
953
{
783
956
if(g != NULL){
784
957
for(char **a = g->argv + 1; *a != NULL; a++){
785
958
if(not add_argument(p, *a)){
786
perror("add_argument");
959
error(0, errno, "add_argument");
787
960
}
788
961
}
789
962
/* Add global environment variables */
790
963
for(char **e = g->environ; *e != NULL; e++){
791
964
if(not add_environment(p, *e, false)){
792
perror("add_environment");
965
error(0, errno, "add_environment");
793
966
}
794
967
}
795
968
}
796
969
}
797
/* If this plugin has any environment variables, we will call
798
using execve and need to duplicate the environment from this
799
process, too. */
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
800
972
if(p->environ[0] != NULL){
801
973
for(char **e = environ; *e != NULL; e++){
802
974
if(not add_environment(p, *e, false)){
803
perror("add_environment");
975
error(0, errno, "add_environment");
804
976
}
805
977
}
806
978
}
807
979
808
980
int pipefd[2];
809
ret = pipe(pipefd);
810
if (ret == -1){
811
perror("pipe");
812
exitstatus = EXIT_FAILURE;
813
goto fallback;
814
}
981
#ifndef O_CLOEXEC
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
986
if(ret == -1){
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
815
1002
/* Ask OS to automatic close the pipe on exec */
816
1003
ret = set_cloexec_flag(pipefd[0]);
817
1004
if(ret < 0){
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
820
1010
goto fallback;
821
1011
}
822
1012
ret = set_cloexec_flag(pipefd[1]);
823
1013
if(ret < 0){
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
826
1019
goto fallback;
827
1020
}
1021
#endif /* not O_CLOEXEC */
828
1022
/* Block SIGCHLD until process is safely in process list */
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
1025
NULL));
830
1026
if(ret < 0){
831
perror("sigprocmask");
832
exitstatus = EXIT_FAILURE;
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
833
1030
goto fallback;
834
1031
}
835
1032
/* Starting a new process to be watched */
836
pid_t pid = fork();
1033
pid_t pid;
1034
do {
1035
pid = fork();
1036
} while(pid == -1 and errno == EINTR);
837
1037
if(pid == -1){
838
perror("fork");
839
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
840
1045
goto fallback;
841
1046
}
842
1047
if(pid == 0){
843
1048
/* this is the child process */
844
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
845
1050
if(ret < 0){
846
perror("sigaction");
847
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
848
1053
}
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
1055
if(ret < 0){
851
perror("sigprocmask");
852
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
853
1058
}
854
1059
855
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
856
1061
if(ret == -1){
857
perror("dup2");
858
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
859
1064
}
860
1065
861
if(dirfd(dir) < 0){
862
/* If dir has no file descriptor, we could not set FD_CLOEXEC
863
above and must now close it manually here. */
864
closedir(dir);
865
}
866
if(p->environ[0] == NULL){
867
if(execv(filename, p->argv) < 0){
868
perror("execv");
869
_exit(EXIT_FAILURE);
870
}
871
} else {
872
if(execve(filename, p->argv, p->environ) < 0){
873
perror("execve");
874
_exit(EXIT_FAILURE);
875
}
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
876
1072
}
877
1073
/* no return */
878
1074
}
879
1075
/* Parent process */
880
1076
close(pipefd[1]); /* Close unused write end of pipe */
881
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
NULL)));
886
1084
if(ret < 0){
887
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
888
1086
}
889
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
890
1089
goto fallback;
891
1090
}
1091
free(direntries[i]);
892
1092
893
1093
new_plugin->pid = pid;
894
1094
new_plugin->fd = pipefd[0];
895
1095
896
1096
/* Unblock SIGCHLD so signal handler can be run if this process
897
1097
has already completed */
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
1100
NULL));
899
1101
if(ret < 0){
900
perror("sigprocmask");
901
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
902
1104
goto fallback;
903
1105
}
904
1106
905
1107
FD_SET(new_plugin->fd, &rfds_all);
906
1108
907
if (maxfd < new_plugin->fd){
1109
if(maxfd < new_plugin->fd){
908
1110
maxfd = new_plugin->fd;
909
1111
}
910
911
1112
}
912
1113
913
closedir(dir);
914
dir = NULL;
915
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
1118
free_plugin(getplugin(NULL));
1119
916
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
1121
if(p->pid != 0){
918
1122
break;
923
1127
free_plugin_list();
924
1128
}
925
1129
}
926
1130
927
1131
/* Main loop while running plugins exist */
928
1132
while(plugin_list){
929
1133
fd_set rfds = rfds_all;
930
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
if (select_ret == -1){
932
perror("select");
933
exitstatus = EXIT_FAILURE;
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
934
1138
goto fallback;
935
1139
}
936
1140
/* OK, now either a process completed, or something can be read
937
1141
from one of them */
938
1142
for(plugin *proc = plugin_list; proc != NULL;){
939
1143
/* Is this process completely done? */
940
if(proc->eof and proc->completed){
1144
if(proc->completed and proc->eof){
941
1145
/* Only accept the plugin output if it exited cleanly */
942
1146
if(not WIFEXITED(proc->status)
943
1147
or WEXITSTATUS(proc->status) != 0){
944
1148
/* Bad exit by plugin */
945
1149
946
1150
if(debug){
947
1151
if(WIFEXITED(proc->status)){
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
950
1155
WEXITSTATUS(proc->status));
951
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
954
WTERMSIG(proc->status));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(proc->status)));
955
1162
} else if(WCOREDUMP(proc->status)){
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1164
" core\n", proc->name, (intmax_t) (proc->pid));
958
1165
}
959
1166
}
960
1167
961
1168
/* Remove the plugin */
962
1169
FD_CLR(proc->fd, &rfds_all);
963
1170
964
1171
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
if(ret < 0){
967
perror("sigprocmask");
968
exitstatus = EXIT_FAILURE;
969
goto fallback;
970
}
971
972
/* We are done modifying process list, so unblock signal */
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
NULL);
975
if(ret < 0){
976
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
1172
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
(SIG_BLOCK,
1174
&sigchld_action.sa_mask,
1175
NULL));
1176
if(ret < 0){
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
1179
goto fallback;
983
1180
}
984
1181
985
1182
plugin *next_plugin = proc->next;
986
1183
free_plugin(proc);
987
1184
proc = next_plugin;
1185
1186
/* We are done modifying process list, so unblock signal */
1187
ret = (int)(TEMP_FAILURE_RETRY
1188
(sigprocmask(SIG_UNBLOCK,
1189
&sigchld_action.sa_mask, NULL)));
1190
if(ret < 0){
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
1193
goto fallback;
1194
}
1195
1196
if(plugin_list == NULL){
1197
break;
1198
}
1199
988
1200
continue;
989
1201
}
990
1202
991
1203
/* This process exited nicely, so print its buffer */
992
1204
993
1205
bool bret = print_out_password(proc->buffer,
994
1206
proc->buffer_length);
995
1207
if(not bret){
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
998
1210
}
999
1211
goto fallback;
1000
1212
}
1007
1219
}
1008
1220
/* Before reading, make the process' data buffer large enough */
1009
1221
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1222
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1223
+ (size_t) BUFFER_SIZE);
1224
if(new_buffer == NULL){
1225
error(0, errno, "malloc");
1226
exitstatus = EX_OSERR;
1015
1227
goto fallback;
1016
1228
}
1229
proc->buffer = new_buffer;
1017
1230
proc->buffer_size += BUFFER_SIZE;
1018
1231
}
1019
1232
/* Read from the process */
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1233
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1234
proc->buffer
1235
+ proc->buffer_length,
1236
BUFFER_SIZE));
1237
if(sret < 0){
1023
1238
/* Read error from this process; ignore the error */
1024
1239
proc = proc->next;
1025
1240
continue;
1026
1241
}
1027
if(ret == 0){
1242
if(sret == 0){
1028
1243
/* got EOF */
1029
1244
proc->eof = true;
1030
1245
} else {
1031
proc->buffer_length += (size_t) ret;
1246
proc->buffer_length += (size_t) sret;
1032
1247
}
1033
1248
}
1034
1249
}
1035
1036
1250
1251
1037
1252
fallback:
1038
1253
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1254
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1255
and exitstatus != EX_OK)){
1040
1256
/* Fallback if all plugins failed, none are found or an error
1041
1257
occured */
1042
1258
bool bret;
1050
1266
}
1051
1267
bret = print_out_password(passwordbuffer, len);
1052
1268
if(not bret){
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1269
error(0, errno, "print_out_password");
1270
exitstatus = EX_IOERR;
1055
1271
}
1056
1272
}
1057
1273
1058
1274
/* Restore old signal handler */
1059
1275
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
1276
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1277
error(0, errno, "sigaction");
1278
exitstatus = EX_OSERR;
1063
1279
}
1064
1280
1065
1281
if(custom_argv != NULL){
1066
1282
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
1283
free(*arg);
1069
1285
free(custom_argv);
1070
1286
}
1071
1287
1072
if(dir != NULL){
1073
closedir(dir);
1288
free(direntries);
1289
1290
if(dir_fd != -1){
1291
close(dir_fd);
1074
1292
}
1075
1293
1076
/* Free the process list and kill the processes */
1294
/* Kill the processes */
1077
1295
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
1296
if(p->pid != 0){
1079
1297
close(p->fd);
1080
1298
ret = kill(p->pid, SIGTERM);
1081
1299
if(ret == -1 and errno != ESRCH){
1082
1300
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1301
error(0, errno, "kill");
1084
1302
}
1085
1303
}
1086
1304
}
1087
1305
1088
1306
/* Wait for any remaining child processes to terminate */
1089
do{
1307
do {
1090
1308
ret = wait(NULL);
1091
1309
} while(ret >= 0);
1092
1310
if(errno != ECHILD){
1093
perror("wait");
1311
error(0, errno, "wait");
1094
1312
}
1095
1313
1096
1314
free_plugin_list();
1097
1315
1098
1316
free(plugindir);
1317
free(pluginhelperdir);
1099
1318
free(argfile);
1100
1319
1101
1320
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0