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- Committer: Teddy Hogeborn
- Date: 2008-09-19 16:04:11 UTC
- Revision ID: teddy@fukt.bsnet.se-20080919160411-9xeasm77gx5xpfqo
* Makefile (install-server): Only do update-rc.d if $(DESTDIR) is
empty.
* debian/control (Source: mandos): Do not depend on "docbook";
"docbook-xsl" is enough.
empty.
* debian/control (Source: mandos): Do not depend on "docbook";
"docbook-xsl" is enough.
- files added:
- etc-plugins.d-README
- files removed:
- DBUS-API
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
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() */
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
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(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
50
*/
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() */
51
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
SIG_UNBLOCK, kill() */
67
65
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
74
66
75
67
#define BUFFER_SIZE 256
76
68
77
69
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
74
84
75
typedef struct plugin{
85
76
char *name; /* can be NULL or any plugin name */
88
79
char **environ;
89
80
int envc;
90
81
bool disabled;
91
82
92
83
/* Variables used for running processes*/
93
84
pid_t pid;
94
85
int fd;
96
87
size_t buffer_size;
97
88
size_t buffer_length;
98
89
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
90
volatile bool completed;
91
volatile int status;
101
92
struct plugin *next;
102
93
} plugin;
103
94
105
96
106
97
/* Gets an existing plugin based on name,
107
98
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
99
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
114
104
return p;
115
105
}
116
106
}
117
107
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
123
110
return NULL;
124
111
}
125
112
char *copy_name = NULL;
126
113
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
114
copy_name = strdup(name);
130
115
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
116
return NULL;
135
117
}
136
118
}
137
119
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
142
124
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
148
127
free(copy_name);
149
128
free(new_plugin);
150
errno = e;
151
129
return NULL;
152
130
}
153
131
new_plugin->argv[0] = copy_name;
154
132
new_plugin->argv[1] = NULL;
155
133
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
134
new_plugin->environ = malloc(sizeof(char *));
159
135
if(new_plugin->environ == NULL){
160
int e = errno;
161
136
free(copy_name);
162
137
free(new_plugin->argv);
163
138
free(new_plugin);
164
errno = e;
165
139
return NULL;
166
140
}
167
141
new_plugin->environ[0] = NULL;
172
146
}
173
147
174
148
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
149
static bool add_to_char_array(const char *new, char ***array,
177
150
int *len){
178
151
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
184
154
/* Malloc check */
185
if(new_array == NULL){
155
if(*array == NULL){
186
156
return false;
187
157
}
188
*array = new_array;
189
158
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
159
char *copy = strdup(new);
194
160
if(copy == NULL){
195
161
return false;
196
162
}
203
169
}
204
170
205
171
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
172
static bool add_argument(plugin *p, const char *arg){
208
173
if(p == NULL){
209
174
return false;
212
177
}
213
178
214
179
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
180
static bool add_environment(plugin *p, const char *def, bool replace){
217
181
if(p == NULL){
218
182
return false;
220
184
/* namelen = length of name of environment variable */
221
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
186
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
225
189
/* It already exists */
226
190
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
232
193
return false;
233
194
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
195
*e = new;
196
strcpy(*e, def);
236
197
}
237
198
return true;
238
199
}
240
201
return add_to_char_array(def, &(p->environ), &(p->envc));
241
202
}
242
203
243
#ifndef O_CLOEXEC
244
204
/*
245
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
206
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
208
*/
249
__attribute__((warn_unused_result))
250
209
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
210
int ret = fcntl(fd, F_GETFD, 0);
252
211
/* If reading the flags failed, return error indication now. */
253
212
if(ret < 0){
254
213
return ret;
255
214
}
256
215
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
217
}
260
#endif /* not O_CLOEXEC */
261
218
262
219
263
220
/* Mark processes as completed when they exit, and save their exit
264
221
status. */
265
222
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
267
223
while(true){
268
224
plugin *proc = plugin_list;
269
225
int status;
273
229
break;
274
230
}
275
231
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
232
if (errno != ECHILD){
233
perror("waitpid");
279
234
}
280
error(0, errno, "waitpid");
235
/* No child processes */
236
break;
281
237
}
282
238
283
239
/* A child exited, find it in process_list */
289
245
continue;
290
246
}
291
247
proc->status = status;
292
proc->completed = 1;
248
proc->completed = true;
293
249
}
294
errno = old_errno;
295
250
}
296
251
297
252
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
253
static bool print_out_password(const char *buffer, size_t length){
300
254
ssize_t ret;
301
255
for(size_t written = 0; written < length; written += (size_t)ret){
309
263
}
310
264
311
265
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
266
static void free_plugin(plugin *plugin_node){
314
267
315
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
321
274
}
322
275
free(plugin_node->environ);
323
276
free(plugin_node->buffer);
324
277
325
278
/* Removes the plugin from the singly-linked list */
326
279
if(plugin_node == plugin_list){
327
280
/* First one - simple */
347
300
348
301
int main(int argc, char *argv[]){
349
302
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
303
char *argfile = NULL;
352
304
FILE *conffp;
353
struct dirent **direntries = NULL;
305
size_t d_name_len;
306
DIR *dir = NULL;
307
struct dirent *dirst;
354
308
struct stat st;
355
309
fd_set rfds_all;
356
310
int ret, maxfd = 0;
357
ssize_t sret;
358
311
uid_t uid = 65534;
359
312
gid_t gid = 65534;
360
313
bool debug = false;
364
317
.sa_flags = SA_NOCLDSTOP };
365
318
char **custom_argv = NULL;
366
319
int custom_argc = 0;
367
int dir_fd = -1;
368
320
369
321
/* Establish a signal handler */
370
322
sigemptyset(&sigchld_action.sa_mask);
371
323
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
324
if(ret == -1){
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
325
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
375
327
goto fallback;
376
328
}
377
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
330
if(ret == -1){
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
331
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
381
333
goto fallback;
382
334
}
383
335
415
367
.doc = "Group ID the plugins will run as", .group = 3 },
416
368
{ .name = "debug", .key = 132,
417
369
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
422
/*
423
* These reproduce what we would get without ARGP_NO_HELP
424
*/
425
{ .name = "help", .key = '?',
426
.doc = "Give this help list", .group = -1 },
427
{ .name = "usage", .key = -3,
428
.doc = "Give a short usage message", .group = -1 },
429
{ .name = "version", .key = 'V',
430
.doc = "Print program version", .group = -1 },
431
370
{ .name = NULL }
432
371
};
433
372
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
errno = 0;
437
switch(key){
438
char *tmp;
439
intmax_t tmp_id;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
440
376
case 'g': /* --global-options */
441
{
442
char *plugin_option;
443
while((plugin_option = strsep(&arg, ",")) != NULL){
444
if(not add_argument(getplugin(NULL), plugin_option)){
445
break;
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;
446
386
}
447
387
}
448
errno = 0;
449
388
}
450
389
break;
451
390
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
454
396
}
455
397
break;
456
398
case 'o': /* --options-for */
457
{
458
char *option_list = strchr(arg, ':');
459
if(option_list == NULL){
460
argp_error(state, "No colon in \"%s\"", arg);
461
errno = EINVAL;
462
break;
463
}
464
*option_list = '\0';
465
option_list++;
466
if(arg[0] == '\0'){
467
argp_error(state, "Empty plugin name");
468
errno = EINVAL;
469
break;
470
}
471
char *option;
472
while((option = strsep(&option_list, ",")) != NULL){
473
if(not add_argument(getplugin(arg), option)){
474
break;
475
}
476
}
477
errno = 0;
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
}
478
418
}
479
419
break;
480
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
481
424
{
482
425
char *envdef = strchr(arg, ':');
483
426
if(envdef == NULL){
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
486
427
break;
487
428
}
488
429
*envdef = '\0';
489
envdef++;
490
if(arg[0] == '\0'){
491
argp_error(state, "Empty plugin name");
492
errno = EINVAL;
493
break;
494
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
497
432
}
498
433
}
499
434
break;
500
435
case 'd': /* --disable */
501
{
436
if (arg != NULL){
502
437
plugin *p = getplugin(arg);
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
506
440
}
441
p->disabled = true;
507
442
}
508
443
break;
509
444
case 'e': /* --enable */
510
{
445
if (arg != NULL){
511
446
plugin *p = getplugin(arg);
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
515
449
}
450
p->disabled = false;
516
451
}
517
452
break;
518
453
case 128: /* --plugin-dir */
519
454
free(plugindir);
520
455
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
456
if(plugindir == NULL){
457
perror("strdup");
458
}
524
459
break;
525
460
case 129: /* --config-file */
526
461
/* This is already done by parse_opt_config_file() */
527
462
break;
528
463
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
530
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
532
argp_error(state, "Bad user ID number: \"%s\", using %"
533
PRIdMAX, arg, (intmax_t)uid);
534
break;
535
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
464
uid = (uid_t)strtol(arg, NULL, 10);
538
465
break;
539
466
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
541
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
543
argp_error(state, "Bad group ID number: \"%s\", using %"
544
PRIdMAX, arg, (intmax_t)gid);
545
break;
546
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
467
gid = (gid_t)strtol(arg, NULL, 10);
549
468
break;
550
469
case 132: /* --debug */
551
470
debug = true;
552
471
break;
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
560
/*
561
* These reproduce what we would get without ARGP_NO_HELP
562
*/
563
case '?': /* --help */
564
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
565
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
566
case -3: /* --usage */
567
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
568
argp_state_help(state, state->out_stream,
569
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
570
case 'V': /* --version */
571
fprintf(state->out_stream, "%s\n", argp_program_version);
572
exit(EXIT_SUCCESS);
573
break;
574
/*
575
* When adding more options before this line, remember to also add a
576
* "case" to the "parse_opt_config_file" function below.
577
*/
578
472
case ARGP_KEY_ARG:
579
473
/* Cryptsetup always passes an argument, which is an empty
580
474
string if "none" was specified in /etc/crypttab. So if
581
475
argument was empty, we ignore it silently. */
582
if(arg[0] == '\0'){
583
break;
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
584
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
585
482
default:
586
483
return ARGP_ERR_UNKNOWN;
587
484
}
588
return errno; /* Set to 0 at start */
485
return 0;
589
486
}
590
487
591
488
/* This option parser is the same as parse_opt() above, except it
592
489
ignores everything but the --config-file option. */
593
error_t parse_opt_config_file(int key, char *arg,
594
__attribute__((unused))
595
struct argp_state *state){
596
errno = 0;
597
switch(key){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
598
494
case 'g': /* --global-options */
599
495
case 'G': /* --global-env */
600
496
case 'o': /* --options-for */
606
502
case 129: /* --config-file */
607
503
free(argfile);
608
504
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
505
if(argfile == NULL){
506
perror("strdup");
611
507
}
612
break;
508
break;
613
509
case 130: /* --userid */
614
510
case 131: /* --groupid */
615
511
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
620
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
621
514
break;
622
515
default:
623
516
return ARGP_ERR_UNKNOWN;
624
517
}
625
return errno;
518
return 0;
626
519
}
627
520
628
521
struct argp argp = { .options = options,
630
523
.args_doc = "",
631
524
.doc = "Mandos plugin runner -- Run plugins" };
632
525
633
/* Parse using parse_opt_config_file() in order to get the custom
526
/* Parse using the parse_opt_config_file in order to get the custom
634
527
config file location, if any. */
635
ret = argp_parse(&argp, argc, argv,
636
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
637
NULL, NULL);
638
switch(ret){
639
case 0:
640
break;
641
case ENOMEM:
642
default:
643
errno = ret;
644
error(0, errno, "argp_parse");
645
exitstatus = EX_OSERR;
646
goto fallback;
647
case EINVAL:
648
exitstatus = EX_USAGE;
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;
649
532
goto fallback;
650
533
}
651
534
653
536
argp.parser = parse_opt;
654
537
655
538
/* Open the configfile if available */
656
if(argfile == NULL){
539
if (argfile == NULL){
657
540
conffp = fopen(AFILE, "r");
658
541
} else {
659
542
conffp = fopen(argfile, "r");
660
}
543
}
661
544
if(conffp != NULL){
662
545
char *org_line = NULL;
663
546
char *p, *arg, *new_arg, *line;
664
547
size_t size = 0;
548
ssize_t sret;
665
549
const char whitespace_delims[] = " \r\t\f\v\n";
666
550
const char comment_delim[] = "#";
667
551
668
552
custom_argc = 1;
669
553
custom_argv = malloc(sizeof(char*) * 2);
670
554
if(custom_argv == NULL){
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
673
557
goto fallback;
674
558
}
675
559
custom_argv[0] = argv[0];
676
560
custom_argv[1] = NULL;
677
561
678
562
/* for each line in the config file, strip whitespace and ignore
679
563
commented text */
680
564
while(true){
682
566
if(sret == -1){
683
567
break;
684
568
}
685
569
686
570
line = org_line;
687
571
arg = strsep(&line, comment_delim);
688
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
691
575
}
692
576
new_arg = strdup(p);
693
577
if(new_arg == NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
696
580
free(org_line);
697
581
goto fallback;
698
582
}
699
583
700
584
custom_argc += 1;
701
{
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
707
free(new_arg);
708
free(org_line);
709
goto fallback;
710
} else {
711
custom_argv = new_argv;
712
}
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;
713
592
}
714
593
custom_argv[custom_argc-1] = new_arg;
715
custom_argv[custom_argc] = NULL;
594
custom_argv[custom_argc] = NULL;
716
595
}
717
596
}
718
do {
719
ret = fclose(conffp);
720
} while(ret == EOF and errno == EINTR);
721
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
724
goto fallback;
725
}
726
597
free(org_line);
727
598
} else {
728
599
/* Check for harmful errors and go to fallback. Other errors might
729
600
not affect opening plugins */
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
733
604
goto fallback;
734
605
}
735
606
}
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
738
609
if(custom_argv != NULL){
739
ret = argp_parse(&argp, custom_argc, custom_argv,
740
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
741
NULL, NULL);
742
switch(ret){
743
case 0:
744
break;
745
case ENOMEM:
746
default:
747
errno = ret;
748
error(0, errno, "argp_parse");
749
exitstatus = EX_OSERR;
750
goto fallback;
751
case EINVAL:
752
exitstatus = EX_CONFIG;
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;
753
615
goto fallback;
754
616
}
755
617
}
756
618
757
619
/* Parse actual command line arguments, to let them override the
758
620
config file */
759
ret = argp_parse(&argp, argc, argv,
760
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
761
NULL, NULL);
762
switch(ret){
763
case 0:
764
break;
765
case ENOMEM:
766
default:
767
errno = ret;
768
error(0, errno, "argp_parse");
769
exitstatus = EX_OSERR;
770
goto fallback;
771
case EINVAL:
772
exitstatus = EX_USAGE;
773
goto fallback;
774
}
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
791
}
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;
792
626
}
793
627
794
628
if(debug){
798
632
for(char **a = p->argv; *a != NULL; a++){
799
633
fprintf(stderr, "\tArg: %s\n", *a);
800
634
}
801
fprintf(stderr, "...and %d environment variables\n", p->envc);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
636
for(char **a = p->environ; *a != NULL; a++){
803
637
fprintf(stderr, "\t%s\n", *a);
804
638
}
805
639
}
806
640
}
807
641
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<http://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
813
if(errno != ENOENT){
814
error(0, errno, "open(\"" PDIR "\")");
815
}
816
} else {
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
818
if(ret == -1){
819
error(0, errno, "fstat");
820
} else {
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
823
if(ret == -1){
824
error(0, errno, "fchown");
825
}
826
}
827
}
828
close(plugindir_fd);
829
}
830
}
831
832
/* Lower permissions */
833
ret = setgid(gid);
834
if(ret == -1){
835
error(0, errno, "setgid");
836
}
642
/* Strip permissions down to nobody */
837
643
ret = setuid(uid);
838
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
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 */
843
665
{
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
845
#ifdef O_CLOEXEC
846
O_CLOEXEC
847
#else /* not O_CLOEXEC */
848
0
849
#endif /* not O_CLOEXEC */
850
);
851
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
854
goto fallback;
855
}
856
857
#ifndef O_CLOEXEC
858
/* Set the FD_CLOEXEC flag on the directory */
859
ret = set_cloexec_flag(dir_fd);
860
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
863
goto fallback;
864
}
865
#endif /* O_CLOEXEC */
866
}
867
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
882
!= FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
886
}
887
return 0;
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;
888
673
}
889
674
}
890
return 1;
891
}
892
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
894
alphasort);
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
897
direntries = NULL;
898
exitstatus = EX_OSERR;
899
goto fallback;
900
675
}
901
676
902
677
FD_ZERO(&rfds_all);
903
678
904
679
/* Read and execute any executable in the plugin directory*/
905
for(int i = 0; i < numplugins; i++){
906
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
908
if(plugin_fd == -1){
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
911
continue;
912
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
914
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
918
continue;
919
}
920
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
921
756
/* Ignore non-executable files */
922
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
925
758
if(debug){
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
760
" with bad type or mode\n", filename);
930
761
}
931
close(plugin_fd);
932
free(direntries[i]);
762
free(filename);
933
763
continue;
934
764
}
935
765
936
plugin *p = getplugin(direntries[i]->d_name);
766
plugin *p = getplugin(dirst->d_name);
937
767
if(p == NULL){
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
768
perror("getplugin");
769
free(filename);
941
770
continue;
942
771
}
943
772
if(p->disabled){
944
773
if(debug){
945
774
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
775
dirst->d_name);
947
776
}
948
close(plugin_fd);
949
free(direntries[i]);
777
free(filename);
950
778
continue;
951
779
}
952
780
{
955
783
if(g != NULL){
956
784
for(char **a = g->argv + 1; *a != NULL; a++){
957
785
if(not add_argument(p, *a)){
958
error(0, errno, "add_argument");
786
perror("add_argument");
959
787
}
960
788
}
961
789
/* Add global environment variables */
962
790
for(char **e = g->environ; *e != NULL; e++){
963
791
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
792
perror("add_environment");
965
793
}
966
794
}
967
795
}
968
796
}
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
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. */
971
800
if(p->environ[0] != NULL){
972
801
for(char **e = environ; *e != NULL; e++){
973
802
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
803
perror("add_environment");
975
804
}
976
805
}
977
806
}
978
807
979
808
int pipefd[2];
980
#ifndef O_CLOEXEC
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
985
if(ret == -1){
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
990
}
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
#ifndef O_CLOEXEC
809
ret = pipe(pipefd);
810
if (ret == -1){
811
perror("pipe");
812
exitstatus = EXIT_FAILURE;
813
goto fallback;
814
}
1001
815
/* Ask OS to automatic close the pipe on exec */
1002
816
ret = set_cloexec_flag(pipefd[0]);
1003
817
if(ret < 0){
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
1009
820
goto fallback;
1010
821
}
1011
822
ret = set_cloexec_flag(pipefd[1]);
1012
823
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
1018
826
goto fallback;
1019
827
}
1020
#endif /* not O_CLOEXEC */
1021
828
/* Block SIGCHLD until process is safely in process list */
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
&sigchld_action.sa_mask,
1024
NULL));
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1025
830
if(ret < 0){
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
831
perror("sigprocmask");
832
exitstatus = EXIT_FAILURE;
1029
833
goto fallback;
1030
834
}
1031
835
/* Starting a new process to be watched */
1032
pid_t pid;
1033
do {
1034
pid = fork();
1035
} while(pid == -1 and errno == EINTR);
836
pid_t pid = fork();
1036
837
if(pid == -1){
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
838
perror("fork");
839
exitstatus = EXIT_FAILURE;
1044
840
goto fallback;
1045
841
}
1046
842
if(pid == 0){
1047
843
/* this is the child process */
1048
844
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1049
845
if(ret < 0){
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
846
perror("sigaction");
847
_exit(EXIT_FAILURE);
1052
848
}
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
850
if(ret < 0){
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
851
perror("sigprocmask");
852
_exit(EXIT_FAILURE);
1057
853
}
1058
854
1059
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1060
856
if(ret == -1){
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
857
perror("dup2");
858
_exit(EXIT_FAILURE);
1063
859
}
1064
860
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1070
_exit(EX_OSERR);
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
}
1071
876
}
1072
877
/* no return */
1073
878
}
1074
879
/* Parent process */
1075
880
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1078
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1080
ret = (int)(TEMP_FAILURE_RETRY
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
NULL)));
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);
1083
886
if(ret < 0){
1084
error(0, errno, "sigprocmask");
887
perror("sigprocmask");
1085
888
}
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
889
exitstatus = EXIT_FAILURE;
1088
890
goto fallback;
1089
891
}
1090
free(direntries[i]);
1091
892
1092
893
new_plugin->pid = pid;
1093
894
new_plugin->fd = pipefd[0];
1094
895
1095
896
/* Unblock SIGCHLD so signal handler can be run if this process
1096
897
has already completed */
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
1099
NULL));
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1100
899
if(ret < 0){
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
900
perror("sigprocmask");
901
exitstatus = EXIT_FAILURE;
1103
902
goto fallback;
1104
903
}
1105
904
1106
905
FD_SET(new_plugin->fd, &rfds_all);
1107
906
1108
if(maxfd < new_plugin->fd){
907
if (maxfd < new_plugin->fd){
1109
908
maxfd = new_plugin->fd;
1110
909
}
910
1111
911
}
1112
912
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1117
free_plugin(getplugin(NULL));
1118
913
closedir(dir);
914
dir = NULL;
915
1119
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
1120
917
if(p->pid != 0){
1121
918
break;
1126
923
free_plugin_list();
1127
924
}
1128
925
}
1129
926
1130
927
/* Main loop while running plugins exist */
1131
928
while(plugin_list){
1132
929
fd_set rfds = rfds_all;
1133
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
931
if (select_ret == -1){
932
perror("select");
933
exitstatus = EXIT_FAILURE;
1137
934
goto fallback;
1138
935
}
1139
936
/* OK, now either a process completed, or something can be read
1140
937
from one of them */
1141
938
for(plugin *proc = plugin_list; proc != NULL;){
1142
939
/* Is this process completely done? */
1143
if(proc->completed and proc->eof){
940
if(proc->eof and proc->completed){
1144
941
/* Only accept the plugin output if it exited cleanly */
1145
942
if(not WIFEXITED(proc->status)
1146
943
or WEXITSTATUS(proc->status) != 0){
1147
944
/* Bad exit by plugin */
1148
945
1149
946
if(debug){
1150
947
if(WIFEXITED(proc->status)){
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1154
950
WEXITSTATUS(proc->status));
1155
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(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));
955
} else if(WCOREDUMP(proc->status)){
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
1161
958
}
1162
959
}
1163
960
1164
961
/* Remove the plugin */
1165
962
FD_CLR(proc->fd, &rfds_all);
1166
963
1167
964
/* Block signal while modifying process_list */
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
1172
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
1175
goto fallback;
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;
1176
983
}
1177
984
1178
985
plugin *next_plugin = proc->next;
1179
986
free_plugin(proc);
1180
987
proc = next_plugin;
1181
1182
/* We are done modifying process list, so unblock signal */
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
1186
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1189
goto fallback;
1190
}
1191
1192
if(plugin_list == NULL){
1193
break;
1194
}
1195
1196
988
continue;
1197
989
}
1198
990
1199
991
/* This process exited nicely, so print its buffer */
1200
992
1201
993
bool bret = print_out_password(proc->buffer,
1202
994
proc->buffer_length);
1203
995
if(not bret){
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1206
998
}
1207
999
goto fallback;
1208
1000
}
1215
1007
}
1216
1008
/* Before reading, make the process' data buffer large enough */
1217
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
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;
1223
1015
goto fallback;
1224
1016
}
1225
proc->buffer = new_buffer;
1226
1017
proc->buffer_size += BUFFER_SIZE;
1227
1018
}
1228
1019
/* Read from the process */
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1230
proc->buffer
1231
+ proc->buffer_length,
1232
BUFFER_SIZE));
1233
if(sret < 0){
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1234
1023
/* Read error from this process; ignore the error */
1235
1024
proc = proc->next;
1236
1025
continue;
1237
1026
}
1238
if(sret == 0){
1027
if(ret == 0){
1239
1028
/* got EOF */
1240
1029
proc->eof = true;
1241
1030
} else {
1242
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1243
1032
}
1244
1033
}
1245
1034
}
1246
1247
1035
1036
1248
1037
fallback:
1249
1038
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1252
1040
/* Fallback if all plugins failed, none are found or an error
1253
1041
occured */
1254
1042
bool bret;
1262
1050
}
1263
1051
bret = print_out_password(passwordbuffer, len);
1264
1052
if(not bret){
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1267
1055
}
1268
1056
}
1269
1057
1270
1058
/* Restore old signal handler */
1271
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1272
1060
if(ret == -1){
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1275
1063
}
1276
1064
1277
1065
if(custom_argv != NULL){
1278
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1279
1067
free(*arg);
1281
1069
free(custom_argv);
1282
1070
}
1283
1071
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1072
if(dir != NULL){
1073
closedir(dir);
1288
1074
}
1289
1075
1290
/* Kill the processes */
1076
/* Free the process list and kill the processes */
1291
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1292
1078
if(p->pid != 0){
1293
1079
close(p->fd);
1294
1080
ret = kill(p->pid, SIGTERM);
1295
1081
if(ret == -1 and errno != ESRCH){
1296
1082
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1083
perror("kill");
1298
1084
}
1299
1085
}
1300
1086
}
1301
1087
1302
1088
/* Wait for any remaining child processes to terminate */
1303
do {
1089
do{
1304
1090
ret = wait(NULL);
1305
1091
} while(ret >= 0);
1306
1092
if(errno != ECHILD){
1307
error(0, errno, "wait");
1093
perror("wait");
1308
1094
}
1309
1095
1310
1096
free_plugin_list();
1311
1097
1312
1098
free(plugindir);
1313
free(pluginhelperdir);
1314
1099
free(argfile);
1315
1100
1316
1101
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0