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- Committer: Teddy Hogeborn
- Date: 2009-01-06 22:54:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20090106225401-7l9f7s3hw9eissra
* mandos (main): Try to find non-privileged user+group in pairs, so
that mismatched pairs are never used.
that mismatched pairs are never used.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- mandos-ctl => mandos-list
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#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() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
43
#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
*/
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
51
53
#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() */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
62
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
63
sigaddset(), sigaction(),
64
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
SIG_UNBLOCK, kill() */
67
66
#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
67
75
68
#define BUFFER_SIZE 256
76
69
77
70
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
72
81
73
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
75
84
76
typedef struct plugin{
85
77
char *name; /* can be NULL or any plugin name */
88
80
char **environ;
89
81
int envc;
90
82
bool disabled;
91
83
92
84
/* Variables used for running processes*/
93
85
pid_t pid;
94
86
int fd;
96
88
size_t buffer_size;
97
89
size_t buffer_length;
98
90
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
91
volatile bool completed;
92
volatile int status;
101
93
struct plugin *next;
102
94
} plugin;
103
95
105
97
106
98
/* Gets an existing plugin based on name,
107
99
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
100
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))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
114
105
return p;
115
106
}
116
107
}
117
108
/* 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){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
123
111
return NULL;
124
112
}
125
113
char *copy_name = NULL;
126
114
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
130
116
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
117
return NULL;
135
118
}
136
119
}
137
120
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
142
125
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;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
148
128
free(copy_name);
149
129
free(new_plugin);
150
errno = e;
151
130
return NULL;
152
131
}
153
132
new_plugin->argv[0] = copy_name;
154
133
new_plugin->argv[1] = NULL;
155
134
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
159
136
if(new_plugin->environ == NULL){
160
int e = errno;
161
137
free(copy_name);
162
138
free(new_plugin->argv);
163
139
free(new_plugin);
164
errno = e;
165
140
return NULL;
166
141
}
167
142
new_plugin->environ[0] = NULL;
172
147
}
173
148
174
149
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
150
static bool add_to_char_array(const char *new, char ***array,
177
151
int *len){
178
152
/* 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);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
184
155
/* Malloc check */
185
if(new_array == NULL){
156
if(*array == NULL){
186
157
return false;
187
158
}
188
*array = new_array;
189
159
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
194
161
if(copy == NULL){
195
162
return false;
196
163
}
203
170
}
204
171
205
172
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
173
static bool add_argument(plugin *p, const char *arg){
208
174
if(p == NULL){
209
175
return false;
212
178
}
213
179
214
180
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
181
static bool add_environment(plugin *p, const char *def, bool replace){
217
182
if(p == NULL){
218
183
return false;
220
185
/* namelen = length of name of environment variable */
221
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
187
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
225
190
/* It already exists */
226
191
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){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
232
194
return false;
233
195
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
196
*e = new;
197
strcpy(*e, def);
236
198
}
237
199
return true;
238
200
}
240
202
return add_to_char_array(def, &(p->environ), &(p->envc));
241
203
}
242
204
243
#ifndef O_CLOEXEC
244
205
/*
245
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
207
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
209
*/
249
__attribute__((warn_unused_result))
250
210
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
252
212
/* If reading the flags failed, return error indication now. */
253
213
if(ret < 0){
254
214
return ret;
255
215
}
256
216
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
218
}
260
#endif /* not O_CLOEXEC */
261
219
262
220
263
221
/* Mark processes as completed when they exit, and save their exit
264
222
status. */
265
223
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
267
224
while(true){
268
225
plugin *proc = plugin_list;
269
226
int status;
273
230
break;
274
231
}
275
232
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
233
if (errno != ECHILD){
234
perror("waitpid");
279
235
}
280
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
281
238
}
282
239
283
240
/* A child exited, find it in process_list */
289
246
continue;
290
247
}
291
248
proc->status = status;
292
proc->completed = 1;
249
proc->completed = true;
293
250
}
294
errno = old_errno;
295
251
}
296
252
297
253
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
254
static bool print_out_password(const char *buffer, size_t length){
300
255
ssize_t ret;
301
256
for(size_t written = 0; written < length; written += (size_t)ret){
309
264
}
310
265
311
266
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
267
static void free_plugin(plugin *plugin_node){
314
268
315
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
321
275
}
322
276
free(plugin_node->environ);
323
277
free(plugin_node->buffer);
324
278
325
279
/* Removes the plugin from the singly-linked list */
326
280
if(plugin_node == plugin_list){
327
281
/* First one - simple */
347
301
348
302
int main(int argc, char *argv[]){
349
303
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
304
char *argfile = NULL;
352
305
FILE *conffp;
353
struct dirent **direntries = NULL;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
354
309
struct stat st;
355
310
fd_set rfds_all;
356
311
int ret, maxfd = 0;
364
319
.sa_flags = SA_NOCLDSTOP };
365
320
char **custom_argv = NULL;
366
321
int custom_argc = 0;
367
int dir_fd = -1;
368
322
369
323
/* Establish a signal handler */
370
324
sigemptyset(&sigchld_action.sa_mask);
371
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
326
if(ret == -1){
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
375
329
goto fallback;
376
330
}
377
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
332
if(ret == -1){
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
381
335
goto fallback;
382
336
}
383
337
415
369
.doc = "Group ID the plugins will run as", .group = 3 },
416
370
{ .name = "debug", .key = 132,
417
371
.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
372
{ .name = NULL }
432
373
};
433
374
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;
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
440
378
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;
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
446
388
}
447
389
}
448
errno = 0;
449
390
}
450
391
break;
451
392
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
454
398
}
455
399
break;
456
400
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;
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
418
}
419
}
478
420
}
479
421
break;
480
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
481
426
{
482
427
char *envdef = strchr(arg, ':');
483
428
if(envdef == NULL){
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
486
429
break;
487
430
}
488
431
*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;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
497
434
}
498
435
}
499
436
break;
500
437
case 'd': /* --disable */
501
{
438
if (arg != NULL){
502
439
plugin *p = getplugin(arg);
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
506
442
}
443
p->disabled = true;
507
444
}
508
445
break;
509
446
case 'e': /* --enable */
510
{
447
if (arg != NULL){
511
448
plugin *p = getplugin(arg);
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
515
451
}
452
p->disabled = false;
516
453
}
517
454
break;
518
455
case 128: /* --plugin-dir */
519
456
free(plugindir);
520
457
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
458
if(plugindir == NULL){
459
perror("strdup");
460
}
524
461
break;
525
462
case 129: /* --config-file */
526
463
/* This is already done by parse_opt_config_file() */
527
464
break;
528
465
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;
466
uid = (uid_t)strtol(arg, NULL, 10);
538
467
break;
539
468
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;
469
gid = (gid_t)strtol(arg, NULL, 10);
549
470
break;
550
471
case 132: /* --debug */
551
472
debug = true;
552
473
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
474
case ARGP_KEY_ARG:
579
475
/* Cryptsetup always passes an argument, which is an empty
580
476
string if "none" was specified in /etc/crypttab. So if
581
477
argument was empty, we ignore it silently. */
582
if(arg[0] == '\0'){
583
break;
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
584
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
585
484
default:
586
485
return ARGP_ERR_UNKNOWN;
587
486
}
588
return errno; /* Set to 0 at start */
487
return 0;
589
488
}
590
489
591
490
/* This option parser is the same as parse_opt() above, except it
592
491
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){
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
598
496
case 'g': /* --global-options */
599
497
case 'G': /* --global-env */
600
498
case 'o': /* --options-for */
606
504
case 129: /* --config-file */
607
505
free(argfile);
608
506
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
507
if(argfile == NULL){
508
perror("strdup");
611
509
}
612
break;
510
break;
613
511
case 130: /* --userid */
614
512
case 131: /* --groupid */
615
513
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
620
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
621
516
break;
622
517
default:
623
518
return ARGP_ERR_UNKNOWN;
624
519
}
625
return errno;
520
return 0;
626
521
}
627
522
628
523
struct argp argp = { .options = options,
630
525
.args_doc = "",
631
526
.doc = "Mandos plugin runner -- Run plugins" };
632
527
633
/* Parse using parse_opt_config_file() in order to get the custom
528
/* Parse using the parse_opt_config_file in order to get the custom
634
529
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;
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
649
534
goto fallback;
650
535
}
651
536
653
538
argp.parser = parse_opt;
654
539
655
540
/* Open the configfile if available */
656
if(argfile == NULL){
541
if (argfile == NULL){
657
542
conffp = fopen(AFILE, "r");
658
543
} else {
659
544
conffp = fopen(argfile, "r");
660
}
545
}
661
546
if(conffp != NULL){
662
547
char *org_line = NULL;
663
548
char *p, *arg, *new_arg, *line;
664
549
size_t size = 0;
665
550
const char whitespace_delims[] = " \r\t\f\v\n";
666
551
const char comment_delim[] = "#";
667
552
668
553
custom_argc = 1;
669
554
custom_argv = malloc(sizeof(char*) * 2);
670
555
if(custom_argv == NULL){
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
673
558
goto fallback;
674
559
}
675
560
custom_argv[0] = argv[0];
676
561
custom_argv[1] = NULL;
677
562
678
563
/* for each line in the config file, strip whitespace and ignore
679
564
commented text */
680
565
while(true){
682
567
if(sret == -1){
683
568
break;
684
569
}
685
570
686
571
line = org_line;
687
572
arg = strsep(&line, comment_delim);
688
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
691
576
}
692
577
new_arg = strdup(p);
693
578
if(new_arg == NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
696
581
free(org_line);
697
582
goto fallback;
698
583
}
699
584
700
585
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
}
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
713
593
}
714
594
custom_argv[custom_argc-1] = new_arg;
715
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
716
596
}
717
597
}
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
598
free(org_line);
727
599
} else {
728
600
/* Check for harmful errors and go to fallback. Other errors might
729
601
not affect opening plugins */
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
733
605
goto fallback;
734
606
}
735
607
}
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
738
610
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;
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
753
616
goto fallback;
754
617
}
755
618
}
756
619
757
620
/* Parse actual command line arguments, to let them override the
758
621
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
}
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
792
627
}
793
628
794
629
if(debug){
798
633
for(char **a = p->argv; *a != NULL; a++){
799
634
fprintf(stderr, "\tArg: %s\n", *a);
800
635
}
801
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
637
for(char **a = p->environ; *a != NULL; a++){
803
638
fprintf(stderr, "\t%s\n", *a);
804
639
}
805
640
}
806
641
}
807
642
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<https://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
}
643
/* Strip permissions down to nobody */
837
644
ret = setuid(uid);
838
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
843
666
{
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;
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
888
674
}
889
675
}
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
676
}
901
677
902
678
FD_ZERO(&rfds_all);
903
679
904
680
/* 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
681
while(true){
682
dirst = readdir(dir);
683
684
/* All directory entries have been processed */
685
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
691
break;
692
}
693
694
d_name_len = strlen(dirst->d_name);
695
696
/* Ignore dotfiles, backup files and other junk */
697
{
698
bool bad_name = false;
699
700
const char const *bad_prefixes[] = { ".", "#", NULL };
701
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-old",
704
".dpkg-bak",
705
".dpkg-divert", NULL };
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
size_t pre_len = strlen(*pre);
708
if((d_name_len >= pre_len)
709
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
if(debug){
711
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
712
" with bad prefix %s\n", dirst->d_name, *pre);
713
}
714
bad_name = true;
715
break;
716
}
717
}
718
if(bad_name){
719
continue;
720
}
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
size_t suf_len = strlen(*suf);
723
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
== 0)){
726
if(debug){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad suffix %s\n", dirst->d_name, *suf);
729
}
730
bad_name = true;
731
break;
732
}
733
}
734
735
if(bad_name){
736
continue;
737
}
738
}
739
740
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
746
if(ret < 0){
747
perror("asprintf");
748
continue;
749
}
750
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
921
758
/* 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)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
925
760
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);
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
930
763
}
931
close(plugin_fd);
932
free(direntries[i]);
764
free(filename);
933
765
continue;
934
766
}
935
767
936
plugin *p = getplugin(direntries[i]->d_name);
768
plugin *p = getplugin(dirst->d_name);
937
769
if(p == NULL){
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
770
perror("getplugin");
771
free(filename);
941
772
continue;
942
773
}
943
774
if(p->disabled){
944
775
if(debug){
945
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
777
dirst->d_name);
947
778
}
948
close(plugin_fd);
949
free(direntries[i]);
779
free(filename);
950
780
continue;
951
781
}
952
782
{
955
785
if(g != NULL){
956
786
for(char **a = g->argv + 1; *a != NULL; a++){
957
787
if(not add_argument(p, *a)){
958
error(0, errno, "add_argument");
788
perror("add_argument");
959
789
}
960
790
}
961
791
/* Add global environment variables */
962
792
for(char **e = g->environ; *e != NULL; e++){
963
793
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
794
perror("add_environment");
965
795
}
966
796
}
967
797
}
968
798
}
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
971
802
if(p->environ[0] != NULL){
972
803
for(char **e = environ; *e != NULL; e++){
973
804
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
805
perror("add_environment");
975
806
}
976
807
}
977
808
}
978
809
979
810
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
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
1001
817
/* Ask OS to automatic close the pipe on exec */
1002
818
ret = set_cloexec_flag(pipefd[0]);
1003
819
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]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
1009
822
goto fallback;
1010
823
}
1011
824
ret = set_cloexec_flag(pipefd[1]);
1012
825
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]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1018
828
goto fallback;
1019
829
}
1020
#endif /* not O_CLOEXEC */
1021
830
/* 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));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1025
832
if(ret < 0){
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1029
835
goto fallback;
1030
836
}
1031
837
/* Starting a new process to be watched */
1032
pid_t pid;
1033
do {
1034
pid = fork();
1035
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
1036
839
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]);
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1044
842
goto fallback;
1045
843
}
1046
844
if(pid == 0){
1047
845
/* this is the child process */
1048
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1049
847
if(ret < 0){
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1052
850
}
1053
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
852
if(ret < 0){
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1057
855
}
1058
856
1059
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1060
858
if(ret == -1){
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1063
861
}
1064
862
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);
863
if(dirfd(dir) < 0){
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
866
closedir(dir);
867
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
1071
878
}
1072
879
/* no return */
1073
880
}
1074
881
/* Parent process */
1075
882
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)));
883
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1083
888
if(ret < 0){
1084
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1085
890
}
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
891
exitstatus = EXIT_FAILURE;
1088
892
goto fallback;
1089
893
}
1090
free(direntries[i]);
1091
894
1092
895
new_plugin->pid = pid;
1093
896
new_plugin->fd = pipefd[0];
1094
897
1095
898
/* Unblock SIGCHLD so signal handler can be run if this process
1096
899
has already completed */
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
1099
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1100
901
if(ret < 0){
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1103
904
goto fallback;
1104
905
}
1105
906
1106
907
FD_SET(new_plugin->fd, &rfds_all);
1107
908
1108
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1109
910
maxfd = new_plugin->fd;
1110
911
}
1111
912
}
1112
913
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1117
free_plugin(getplugin(NULL));
914
closedir(dir);
915
dir = NULL;
1118
916
1119
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1120
918
if(p->pid != 0){
1131
929
while(plugin_list){
1132
930
fd_set rfds = rfds_all;
1133
931
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;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1137
935
goto fallback;
1138
936
}
1139
937
/* OK, now either a process completed, or something can be read
1140
938
from one of them */
1141
939
for(plugin *proc = plugin_list; proc != NULL;){
1142
940
/* Is this process completely done? */
1143
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1144
942
/* Only accept the plugin output if it exited cleanly */
1145
943
if(not WIFEXITED(proc->status)
1146
944
or WEXITSTATUS(proc->status) != 0){
1147
945
/* Bad exit by plugin */
1148
946
1149
947
if(debug){
1150
948
if(WIFEXITED(proc->status)){
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1154
951
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)));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
956
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1161
959
}
1162
960
}
1163
961
1164
962
/* Remove the plugin */
1165
963
FD_CLR(proc->fd, &rfds_all);
1166
964
1167
965
/* Block signal while modifying process_list */
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
967
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1175
970
goto fallback;
1176
971
}
1177
972
1180
975
proc = next_plugin;
1181
976
1182
977
/* 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)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1186
980
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1189
983
goto fallback;
1190
984
}
1191
985
1201
995
bool bret = print_out_password(proc->buffer,
1202
996
proc->buffer_length);
1203
997
if(not bret){
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1206
1000
}
1207
1001
goto fallback;
1208
1002
}
1215
1009
}
1216
1010
/* Before reading, make the process' data buffer large enough */
1217
1011
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;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1223
1017
goto fallback;
1224
1018
}
1225
proc->buffer = new_buffer;
1226
1019
proc->buffer_size += BUFFER_SIZE;
1227
1020
}
1228
1021
/* Read from the process */
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1230
proc->buffer
1231
+ proc->buffer_length,
1232
BUFFER_SIZE));
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1233
1024
if(sret < 0){
1234
1025
/* Read error from this process; ignore the error */
1235
1026
proc = proc->next;
1243
1034
}
1244
1035
}
1245
1036
}
1246
1247
1037
1038
1248
1039
fallback:
1249
1040
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1252
1042
/* Fallback if all plugins failed, none are found or an error
1253
1043
occured */
1254
1044
bool bret;
1262
1052
}
1263
1053
bret = print_out_password(passwordbuffer, len);
1264
1054
if(not bret){
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1267
1057
}
1268
1058
}
1269
1059
1270
1060
/* Restore old signal handler */
1271
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1272
1062
if(ret == -1){
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1275
1065
}
1276
1066
1277
1067
if(custom_argv != NULL){
1281
1071
free(custom_argv);
1282
1072
}
1283
1073
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1074
if(dir != NULL){
1075
closedir(dir);
1288
1076
}
1289
1077
1290
1078
/* Kill the processes */
1294
1082
ret = kill(p->pid, SIGTERM);
1295
1083
if(ret == -1 and errno != ESRCH){
1296
1084
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1085
perror("kill");
1298
1086
}
1299
1087
}
1300
1088
}
1301
1089
1302
1090
/* Wait for any remaining child processes to terminate */
1303
do {
1091
do{
1304
1092
ret = wait(NULL);
1305
1093
} while(ret >= 0);
1306
1094
if(errno != ECHILD){
1307
error(0, errno, "wait");
1095
perror("wait");
1308
1096
}
1309
1097
1310
1098
free_plugin_list();
1311
1099
1312
1100
free(plugindir);
1313
free(pluginhelperdir);
1314
1101
free(argfile);
1315
1102
1316
1103
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0