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- Committer: Teddy Hogeborn
- Date: 2019-04-09 19:41:53 UTC
- mfrom: (237.7.647 trunk)
- Revision ID: teddy@recompile.se-20190409194153-khftfvj3ee27md1a
Merge from trunk
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
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() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
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>";
74
75
struct plugin;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
98
106
99
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
106
115
return p;
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
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){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
138
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
126
143
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
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;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
156
136
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
156
185
/* Malloc check */
157
if(*array == NULL){
186
if(new_array == NULL){
158
187
return false;
159
188
}
189
*array = new_array;
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
163
196
return false;
164
197
}
171
204
}
172
205
173
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
174
208
static bool add_argument(plugin *p, const char *arg){
175
209
if(p == NULL){
176
210
return false;
179
213
}
180
214
181
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
182
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
186
221
/* namelen = length of name of environment variable */
187
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
223
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
191
226
/* It already exists */
192
227
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
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){
195
233
return false;
196
234
}
197
*e = new;
198
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
199
237
}
200
238
return true;
201
239
}
203
241
return add_to_char_array(def, &(p->environ), &(p->envc));
204
242
}
205
243
244
#ifndef O_CLOEXEC
206
245
/*
207
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
247
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
249
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
253
/* If reading the flags failed, return error indication now. */
215
254
if(ret < 0){
216
255
return ret;
217
256
}
218
257
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
220
260
}
261
#endif /* not O_CLOEXEC */
221
262
222
263
223
264
/* Mark processes as completed when they exit, and save their exit
224
265
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
226
268
while(true){
227
269
plugin *proc = plugin_list;
228
270
int status;
232
274
break;
233
275
}
234
276
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
237
280
}
238
/* No child processes */
239
break;
281
error(0, errno, "waitpid");
240
282
}
241
283
242
284
/* A child exited, find it in process_list */
248
290
continue;
249
291
}
250
292
proc->status = status;
251
proc->completed = true;
293
proc->completed = 1;
252
294
}
295
errno = old_errno;
253
296
}
254
297
255
298
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
257
301
ssize_t ret;
258
302
for(size_t written = 0; written < length; written += (size_t)ret){
259
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
266
310
}
267
311
268
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
269
314
static void free_plugin(plugin *plugin_node){
270
315
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
272
317
free(*arg);
273
318
}
319
free(plugin_node->name);
274
320
free(plugin_node->argv);
275
321
for(char **env = plugin_node->environ; *env != NULL; env++){
276
322
free(*env);
277
323
}
278
324
free(plugin_node->environ);
279
325
free(plugin_node->buffer);
280
326
281
327
/* Removes the plugin from the singly-linked list */
282
328
if(plugin_node == plugin_list){
283
329
/* First one - simple */
303
349
304
350
int main(int argc, char *argv[]){
305
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
306
353
char *argfile = NULL;
307
354
FILE *conffp;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
355
struct dirent **direntries = NULL;
311
356
struct stat st;
312
357
fd_set rfds_all;
313
358
int ret, maxfd = 0;
359
ssize_t sret;
314
360
uid_t uid = 65534;
315
361
gid_t gid = 65534;
316
362
bool debug = false;
320
366
.sa_flags = SA_NOCLDSTOP };
321
367
char **custom_argv = NULL;
322
368
int custom_argc = 0;
369
int dir_fd = -1;
323
370
324
371
/* Establish a signal handler */
325
372
sigemptyset(&sigchld_action.sa_mask);
326
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
374
if(ret == -1){
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
330
377
goto fallback;
331
378
}
332
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
380
if(ret == -1){
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
336
383
goto fallback;
337
384
}
338
385
370
417
.doc = "Group ID the plugins will run as", .group = 3 },
371
418
{ .name = "debug", .key = 132,
372
419
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
373
433
{ .name = NULL }
374
434
};
375
435
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
379
442
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
389
448
}
390
449
}
450
errno = 0;
391
451
}
392
452
break;
393
453
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
399
456
}
400
457
break;
401
458
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
477
}
478
}
479
errno = 0;
421
480
}
422
481
break;
423
482
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
483
{
428
484
char *envdef = strchr(arg, ':');
429
485
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
430
488
break;
431
489
}
432
490
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
491
envdef++;
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
435
499
}
436
500
}
437
501
break;
438
502
case 'd': /* --disable */
439
if (arg != NULL){
503
{
440
504
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
443
508
}
444
p->disabled = true;
445
509
}
446
510
break;
447
511
case 'e': /* --enable */
448
if (arg != NULL){
512
{
449
513
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
452
517
}
453
p->disabled = false;
454
518
}
455
519
break;
456
520
case 128: /* --plugin-dir */
457
521
free(plugindir);
458
522
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
523
if(plugindir != NULL){
524
errno = 0;
525
}
462
526
break;
463
527
case 129: /* --config-file */
464
528
/* This is already done by parse_opt_config_file() */
465
529
break;
466
530
case 130: /* --userid */
467
uid = (uid_t)strtol(arg, NULL, 10);
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
468
540
break;
469
541
case 131: /* --groupid */
470
gid = (gid_t)strtol(arg, NULL, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
471
551
break;
472
552
case 132: /* --debug */
473
553
debug = true;
474
554
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
475
582
case ARGP_KEY_ARG:
476
583
/* Cryptsetup always passes an argument, which is an empty
477
584
string if "none" was specified in /etc/crypttab. So if
478
585
argument was empty, we ignore it silently. */
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
586
if(arg[0] == '\0'){
587
break;
481
588
}
482
break;
483
case ARGP_KEY_END:
484
break;
589
/* FALLTHROUGH */
485
590
default:
486
591
return ARGP_ERR_UNKNOWN;
487
592
}
488
return 0;
593
return errno; /* Set to 0 at start */
489
594
}
490
595
491
596
/* This option parser is the same as parse_opt() above, except it
492
597
ignores everything but the --config-file option. */
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
598
error_t parse_opt_config_file(int key, char *arg,
599
__attribute__((unused))
600
struct argp_state *state){
601
errno = 0;
602
switch(key){
497
603
case 'g': /* --global-options */
498
604
case 'G': /* --global-env */
499
605
case 'o': /* --options-for */
505
611
case 129: /* --config-file */
506
612
free(argfile);
507
613
argfile = strdup(arg);
508
if(argfile == NULL){
509
perror("strdup");
614
if(argfile != NULL){
615
errno = 0;
510
616
}
511
break;
617
break;
512
618
case 130: /* --userid */
513
619
case 131: /* --groupid */
514
620
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
622
case '?': /* --help */
623
case -3: /* --usage */
624
case 'V': /* --version */
515
625
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
517
626
break;
518
627
default:
519
628
return ARGP_ERR_UNKNOWN;
520
629
}
521
return 0;
630
return errno;
522
631
}
523
632
524
633
struct argp argp = { .options = options,
526
635
.args_doc = "",
527
636
.doc = "Mandos plugin runner -- Run plugins" };
528
637
529
/* Parse using the parse_opt_config_file in order to get the custom
638
/* Parse using parse_opt_config_file() in order to get the custom
530
639
config file location, if any. */
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
532
if (ret == ARGP_ERR_UNKNOWN){
533
fprintf(stderr, "Unknown error while parsing arguments\n");
534
exitstatus = EXIT_FAILURE;
640
ret = argp_parse(&argp, argc, argv,
641
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
642
NULL, NULL);
643
switch(ret){
644
case 0:
645
break;
646
case ENOMEM:
647
default:
648
errno = ret;
649
error(0, errno, "argp_parse");
650
exitstatus = EX_OSERR;
651
goto fallback;
652
case EINVAL:
653
exitstatus = EX_USAGE;
535
654
goto fallback;
536
655
}
537
656
539
658
argp.parser = parse_opt;
540
659
541
660
/* Open the configfile if available */
542
if (argfile == NULL){
661
if(argfile == NULL){
543
662
conffp = fopen(AFILE, "r");
544
663
} else {
545
664
conffp = fopen(argfile, "r");
546
}
665
}
547
666
if(conffp != NULL){
548
667
char *org_line = NULL;
549
668
char *p, *arg, *new_arg, *line;
550
669
size_t size = 0;
551
ssize_t sret;
552
670
const char whitespace_delims[] = " \r\t\f\v\n";
553
671
const char comment_delim[] = "#";
554
672
555
673
custom_argc = 1;
556
674
custom_argv = malloc(sizeof(char*) * 2);
557
675
if(custom_argv == NULL){
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
676
error(0, errno, "malloc");
677
exitstatus = EX_OSERR;
560
678
goto fallback;
561
679
}
562
680
custom_argv[0] = argv[0];
563
681
custom_argv[1] = NULL;
564
682
565
683
/* for each line in the config file, strip whitespace and ignore
566
684
commented text */
567
685
while(true){
569
687
if(sret == -1){
570
688
break;
571
689
}
572
690
573
691
line = org_line;
574
692
arg = strsep(&line, comment_delim);
575
693
while((p = strsep(&arg, whitespace_delims)) != NULL){
578
696
}
579
697
new_arg = strdup(p);
580
698
if(new_arg == NULL){
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
699
error(0, errno, "strdup");
700
exitstatus = EX_OSERR;
583
701
free(org_line);
584
702
goto fallback;
585
703
}
586
704
587
705
custom_argc += 1;
588
custom_argv = realloc(custom_argv, sizeof(char *)
589
* ((unsigned int) custom_argc + 1));
590
if(custom_argv == NULL){
591
perror("realloc");
592
exitstatus = EXIT_FAILURE;
593
free(org_line);
594
goto fallback;
706
{
707
char **new_argv = realloc(custom_argv, sizeof(char *)
708
* ((size_t)custom_argc + 1));
709
if(new_argv == NULL){
710
error(0, errno, "realloc");
711
exitstatus = EX_OSERR;
712
free(new_arg);
713
free(org_line);
714
goto fallback;
715
} else {
716
custom_argv = new_argv;
717
}
595
718
}
596
719
custom_argv[custom_argc-1] = new_arg;
597
custom_argv[custom_argc] = NULL;
720
custom_argv[custom_argc] = NULL;
598
721
}
599
722
}
723
do {
724
ret = fclose(conffp);
725
} while(ret == EOF and errno == EINTR);
726
if(ret == EOF){
727
error(0, errno, "fclose");
728
exitstatus = EX_IOERR;
729
goto fallback;
730
}
600
731
free(org_line);
601
732
} else {
602
733
/* Check for harmful errors and go to fallback. Other errors might
603
734
not affect opening plugins */
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
perror("fopen");
606
exitstatus = EXIT_FAILURE;
735
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
736
error(0, errno, "fopen");
737
exitstatus = EX_OSERR;
607
738
goto fallback;
608
739
}
609
740
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
741
/* If there were any arguments from the configuration file, pass
742
them to parser as command line arguments */
612
743
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
615
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
617
exitstatus = EXIT_FAILURE;
744
ret = argp_parse(&argp, custom_argc, custom_argv,
745
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
746
NULL, NULL);
747
switch(ret){
748
case 0:
749
break;
750
case ENOMEM:
751
default:
752
errno = ret;
753
error(0, errno, "argp_parse");
754
exitstatus = EX_OSERR;
755
goto fallback;
756
case EINVAL:
757
exitstatus = EX_CONFIG;
618
758
goto fallback;
619
759
}
620
760
}
621
761
622
762
/* Parse actual command line arguments, to let them override the
623
763
config file */
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
628
goto fallback;
764
ret = argp_parse(&argp, argc, argv,
765
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
766
NULL, NULL);
767
switch(ret){
768
case 0:
769
break;
770
case ENOMEM:
771
default:
772
errno = ret;
773
error(0, errno, "argp_parse");
774
exitstatus = EX_OSERR;
775
goto fallback;
776
case EINVAL:
777
exitstatus = EX_USAGE;
778
goto fallback;
779
}
780
781
{
782
char *pluginhelperenv;
783
bool bret = true;
784
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
785
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
786
if(ret != -1){
787
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
788
}
789
if(ret == -1 or not bret){
790
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
791
" environment variable to \"%s\" for all plugins\n",
792
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
793
}
794
if(ret != -1){
795
free(pluginhelperenv);
796
}
629
797
}
630
798
631
799
if(debug){
632
for(plugin *p = plugin_list; p != NULL; p=p->next){
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
633
801
fprintf(stderr, "Plugin: %s has %d arguments\n",
634
802
p->name ? p->name : "Global", p->argc - 1);
635
803
for(char **a = p->argv; *a != NULL; a++){
636
804
fprintf(stderr, "\tArg: %s\n", *a);
637
805
}
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
806
fprintf(stderr, "...and %d environment variables\n", p->envc);
639
807
for(char **a = p->environ; *a != NULL; a++){
640
808
fprintf(stderr, "\t%s\n", *a);
641
809
}
642
810
}
643
811
}
644
812
645
/* Strip permissions down to nobody */
813
if(getuid() == 0){
814
/* Work around Debian bug #633582:
815
<https://bugs.debian.org/633582> */
816
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
817
if(plugindir_fd == -1){
818
if(errno != ENOENT){
819
error(0, errno, "open(\"" PDIR "\")");
820
}
821
} else {
822
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
823
if(ret == -1){
824
error(0, errno, "fstat");
825
} else {
826
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
827
ret = fchown(plugindir_fd, uid, gid);
828
if(ret == -1){
829
error(0, errno, "fchown");
830
}
831
}
832
}
833
close(plugindir_fd);
834
}
835
}
836
837
/* Lower permissions */
838
ret = setgid(gid);
839
if(ret == -1){
840
error(0, errno, "setgid");
841
}
646
842
ret = setuid(uid);
647
if (ret == -1){
648
perror("setuid");
649
}
650
setgid(gid);
651
if (ret == -1){
652
perror("setgid");
653
}
654
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
661
if(dir == NULL){
662
perror("Could not open plugin dir");
663
exitstatus = EXIT_FAILURE;
664
goto fallback;
665
}
666
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
843
if(ret == -1){
844
error(0, errno, "setuid");
845
}
846
847
/* Open plugin directory with close_on_exec flag */
668
848
{
669
int dir_fd = dirfd(dir);
670
if(dir_fd >= 0){
671
ret = set_cloexec_flag(dir_fd);
672
if(ret < 0){
673
perror("set_cloexec_flag");
674
exitstatus = EXIT_FAILURE;
675
goto fallback;
849
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
850
#ifdef O_CLOEXEC
851
O_CLOEXEC
852
#else /* not O_CLOEXEC */
853
0
854
#endif /* not O_CLOEXEC */
855
);
856
if(dir_fd == -1){
857
error(0, errno, "Could not open plugin dir");
858
exitstatus = EX_UNAVAILABLE;
859
goto fallback;
860
}
861
862
#ifndef O_CLOEXEC
863
/* Set the FD_CLOEXEC flag on the directory */
864
ret = set_cloexec_flag(dir_fd);
865
if(ret < 0){
866
error(0, errno, "set_cloexec_flag");
867
exitstatus = EX_OSERR;
868
goto fallback;
869
}
870
#endif /* O_CLOEXEC */
871
}
872
873
int good_name(const struct dirent * const dirent){
874
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
875
"*.dpkg-old", "*.dpkg-bak",
876
"*.dpkg-divert", NULL };
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pat = (const char **)patterns;
882
*pat != NULL; pat++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
886
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
887
!= FNM_NOMATCH){
888
if(debug){
889
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
890
" matching pattern %s\n", dirent->d_name, *pat);
891
}
892
return 0;
676
893
}
677
894
}
895
return 1;
896
}
897
898
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
alphasort);
900
if(numplugins == -1){
901
error(0, errno, "Could not scan plugin dir");
902
direntries = NULL;
903
exitstatus = EX_OSERR;
904
goto fallback;
678
905
}
679
906
680
907
FD_ZERO(&rfds_all);
681
908
682
909
/* Read and execute any executable in the plugin directory*/
683
while(true){
684
dirst = readdir(dir);
685
686
/* All directory entries have been processed */
687
if(dirst == NULL){
688
if (errno == EBADF){
689
perror("readdir");
690
exitstatus = EXIT_FAILURE;
691
goto fallback;
692
}
693
break;
694
}
695
696
d_name_len = strlen(dirst->d_name);
697
698
/* Ignore dotfiles, backup files and other junk */
699
{
700
bool bad_name = false;
701
702
const char const *bad_prefixes[] = { ".", "#", NULL };
703
704
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
705
".dpkg-old",
706
".dpkg-divert", NULL };
707
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
708
size_t pre_len = strlen(*pre);
709
if((d_name_len >= pre_len)
710
and strncmp((dirst->d_name), *pre, pre_len) == 0){
711
if(debug){
712
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
713
" with bad prefix %s\n", dirst->d_name, *pre);
714
}
715
bad_name = true;
716
break;
717
}
718
}
719
if(bad_name){
720
continue;
721
}
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
size_t suf_len = strlen(*suf);
724
if((d_name_len >= suf_len)
725
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
726
== 0)){
727
if(debug){
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad suffix %s\n", dirst->d_name, *suf);
730
}
731
bad_name = true;
732
break;
733
}
734
}
735
736
if(bad_name){
737
continue;
738
}
739
}
740
741
char *filename;
742
if(plugindir == NULL){
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
744
} else {
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
}
747
if(ret < 0){
748
perror("asprintf");
749
continue;
750
}
751
752
ret = stat(filename, &st);
753
if (ret == -1){
754
perror("stat");
755
free(filename);
756
continue;
757
}
758
910
for(int i = 0; i < numplugins; i++){
911
912
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
913
if(plugin_fd == -1){
914
error(0, errno, "Could not open plugin");
915
free(direntries[i]);
916
continue;
917
}
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
919
if(ret == -1){
920
error(0, errno, "stat");
921
close(plugin_fd);
922
free(direntries[i]);
923
continue;
924
}
925
759
926
/* Ignore non-executable files */
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
if(not S_ISREG(st.st_mode)
928
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
929
X_OK, 0)) != 0)){
761
930
if(debug){
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
763
" with bad type or mode\n", filename);
931
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
932
" with bad type or mode\n",
933
plugindir != NULL ? plugindir : PDIR,
934
direntries[i]->d_name);
764
935
}
765
free(filename);
936
close(plugin_fd);
937
free(direntries[i]);
766
938
continue;
767
939
}
768
940
769
plugin *p = getplugin(dirst->d_name);
941
plugin *p = getplugin(direntries[i]->d_name);
770
942
if(p == NULL){
771
perror("getplugin");
772
free(filename);
943
error(0, errno, "getplugin");
944
close(plugin_fd);
945
free(direntries[i]);
773
946
continue;
774
947
}
775
948
if(p->disabled){
776
949
if(debug){
777
950
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
778
dirst->d_name);
951
direntries[i]->d_name);
779
952
}
780
free(filename);
953
close(plugin_fd);
954
free(direntries[i]);
781
955
continue;
782
956
}
783
957
{
786
960
if(g != NULL){
787
961
for(char **a = g->argv + 1; *a != NULL; a++){
788
962
if(not add_argument(p, *a)){
789
perror("add_argument");
963
error(0, errno, "add_argument");
790
964
}
791
965
}
792
966
/* Add global environment variables */
793
967
for(char **e = g->environ; *e != NULL; e++){
794
968
if(not add_environment(p, *e, false)){
795
perror("add_environment");
969
error(0, errno, "add_environment");
796
970
}
797
971
}
798
972
}
799
973
}
800
/* If this plugin has any environment variables, we will call
801
using execve and need to duplicate the environment from this
802
process, too. */
974
/* If this plugin has any environment variables, we need to
975
duplicate the environment from this process, too. */
803
976
if(p->environ[0] != NULL){
804
977
for(char **e = environ; *e != NULL; e++){
805
978
if(not add_environment(p, *e, false)){
806
perror("add_environment");
979
error(0, errno, "add_environment");
807
980
}
808
981
}
809
982
}
810
983
811
984
int pipefd[2];
812
ret = pipe(pipefd);
813
if (ret == -1){
814
perror("pipe");
815
exitstatus = EXIT_FAILURE;
816
goto fallback;
817
}
985
#ifndef O_CLOEXEC
986
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
987
#else /* O_CLOEXEC */
988
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
989
#endif /* O_CLOEXEC */
990
if(ret == -1){
991
error(0, errno, "pipe");
992
exitstatus = EX_OSERR;
993
free(direntries[i]);
994
goto fallback;
995
}
996
if(pipefd[0] >= FD_SETSIZE){
997
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
998
FD_SETSIZE);
999
close(pipefd[0]);
1000
close(pipefd[1]);
1001
exitstatus = EX_OSERR;
1002
free(direntries[i]);
1003
goto fallback;
1004
}
1005
#ifndef O_CLOEXEC
818
1006
/* Ask OS to automatic close the pipe on exec */
819
1007
ret = set_cloexec_flag(pipefd[0]);
820
1008
if(ret < 0){
821
perror("set_cloexec_flag");
822
exitstatus = EXIT_FAILURE;
1009
error(0, errno, "set_cloexec_flag");
1010
close(pipefd[0]);
1011
close(pipefd[1]);
1012
exitstatus = EX_OSERR;
1013
free(direntries[i]);
823
1014
goto fallback;
824
1015
}
825
1016
ret = set_cloexec_flag(pipefd[1]);
826
1017
if(ret < 0){
827
perror("set_cloexec_flag");
828
exitstatus = EXIT_FAILURE;
1018
error(0, errno, "set_cloexec_flag");
1019
close(pipefd[0]);
1020
close(pipefd[1]);
1021
exitstatus = EX_OSERR;
1022
free(direntries[i]);
829
1023
goto fallback;
830
1024
}
1025
#endif /* not O_CLOEXEC */
831
1026
/* Block SIGCHLD until process is safely in process list */
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1027
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1028
&sigchld_action.sa_mask,
1029
NULL));
833
1030
if(ret < 0){
834
perror("sigprocmask");
835
exitstatus = EXIT_FAILURE;
1031
error(0, errno, "sigprocmask");
1032
exitstatus = EX_OSERR;
1033
free(direntries[i]);
836
1034
goto fallback;
837
1035
}
838
1036
/* Starting a new process to be watched */
839
pid_t pid = fork();
1037
pid_t pid;
1038
do {
1039
pid = fork();
1040
} while(pid == -1 and errno == EINTR);
840
1041
if(pid == -1){
841
perror("fork");
842
exitstatus = EXIT_FAILURE;
1042
error(0, errno, "fork");
1043
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1044
&sigchld_action.sa_mask, NULL));
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
843
1049
goto fallback;
844
1050
}
845
1051
if(pid == 0){
846
1052
/* this is the child process */
847
1053
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
848
1054
if(ret < 0){
849
perror("sigaction");
850
_exit(EXIT_FAILURE);
1055
error(0, errno, "sigaction");
1056
_exit(EX_OSERR);
851
1057
}
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1058
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
853
1059
if(ret < 0){
854
perror("sigprocmask");
855
_exit(EXIT_FAILURE);
1060
error(0, errno, "sigprocmask");
1061
_exit(EX_OSERR);
856
1062
}
857
1063
858
1064
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
859
1065
if(ret == -1){
860
perror("dup2");
861
_exit(EXIT_FAILURE);
1066
error(0, errno, "dup2");
1067
_exit(EX_OSERR);
862
1068
}
863
1069
864
if(dirfd(dir) < 0){
865
/* If dir has no file descriptor, we could not set FD_CLOEXEC
866
above and must now close it manually here. */
867
closedir(dir);
868
}
869
if(p->environ[0] == NULL){
870
if(execv(filename, p->argv) < 0){
871
perror("execv");
872
_exit(EXIT_FAILURE);
873
}
874
} else {
875
if(execve(filename, p->argv, p->environ) < 0){
876
perror("execve");
877
_exit(EXIT_FAILURE);
878
}
1070
if(fexecve(plugin_fd, p->argv,
1071
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1072
error(0, errno, "fexecve for %s/%s",
1073
plugindir != NULL ? plugindir : PDIR,
1074
direntries[i]->d_name);
1075
_exit(EX_OSERR);
879
1076
}
880
1077
/* no return */
881
1078
}
882
1079
/* Parent process */
883
1080
close(pipefd[1]); /* Close unused write end of pipe */
884
free(filename);
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
perror("getplugin");
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1081
close(plugin_fd);
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
1083
if(new_plugin == NULL){
1084
error(0, errno, "getplugin");
1085
ret = (int)(TEMP_FAILURE_RETRY
1086
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1087
NULL)));
889
1088
if(ret < 0){
890
perror("sigprocmask");
1089
error(0, errno, "sigprocmask");
891
1090
}
892
exitstatus = EXIT_FAILURE;
1091
exitstatus = EX_OSERR;
1092
free(direntries[i]);
893
1093
goto fallback;
894
1094
}
1095
free(direntries[i]);
895
1096
896
1097
new_plugin->pid = pid;
897
1098
new_plugin->fd = pipefd[0];
898
1099
1100
if(debug){
1101
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1102
new_plugin->name, (intmax_t) (new_plugin->pid));
1103
}
1104
899
1105
/* Unblock SIGCHLD so signal handler can be run if this process
900
1106
has already completed */
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
1109
NULL));
902
1110
if(ret < 0){
903
perror("sigprocmask");
904
exitstatus = EXIT_FAILURE;
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
905
1113
goto fallback;
906
1114
}
907
1115
908
1116
FD_SET(new_plugin->fd, &rfds_all);
909
1117
910
if (maxfd < new_plugin->fd){
1118
if(maxfd < new_plugin->fd){
911
1119
maxfd = new_plugin->fd;
912
1120
}
913
914
1121
}
915
1122
916
closedir(dir);
917
dir = NULL;
918
1123
free(direntries);
1124
direntries = NULL;
1125
close(dir_fd);
1126
dir_fd = -1;
1127
free_plugin(getplugin(NULL));
1128
919
1129
for(plugin *p = plugin_list; p != NULL; p = p->next){
920
1130
if(p->pid != 0){
921
1131
break;
926
1136
free_plugin_list();
927
1137
}
928
1138
}
929
1139
930
1140
/* Main loop while running plugins exist */
931
1141
while(plugin_list){
932
1142
fd_set rfds = rfds_all;
933
1143
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
if (select_ret == -1){
935
perror("select");
936
exitstatus = EXIT_FAILURE;
1144
if(select_ret == -1 and errno != EINTR){
1145
error(0, errno, "select");
1146
exitstatus = EX_OSERR;
937
1147
goto fallback;
938
1148
}
939
1149
/* OK, now either a process completed, or something can be read
940
1150
from one of them */
941
1151
for(plugin *proc = plugin_list; proc != NULL;){
942
1152
/* Is this process completely done? */
943
if(proc->eof and proc->completed){
1153
if(proc->completed and proc->eof){
944
1154
/* Only accept the plugin output if it exited cleanly */
945
1155
if(not WIFEXITED(proc->status)
946
1156
or WEXITSTATUS(proc->status) != 0){
947
1157
/* Bad exit by plugin */
948
1158
949
1159
if(debug){
950
1160
if(WIFEXITED(proc->status)){
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1161
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1162
" status %d\n", proc->name,
1163
(intmax_t) (proc->pid),
953
1164
WEXITSTATUS(proc->status));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(proc->status));
958
} else if(WCOREDUMP(proc->status)){
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1165
} else if(WIFSIGNALED(proc->status)){
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1167
" signal %d: %s\n", proc->name,
1168
(intmax_t) (proc->pid),
1169
WTERMSIG(proc->status),
1170
strsignal(WTERMSIG(proc->status)));
961
1171
}
962
1172
}
963
1173
964
1174
/* Remove the plugin */
965
1175
FD_CLR(proc->fd, &rfds_all);
966
1176
967
1177
/* Block signal while modifying process_list */
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
978
if(ret < 0){
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
1182
if(ret < 0){
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
1185
goto fallback;
986
1186
}
987
1187
988
1188
plugin *next_plugin = proc->next;
989
1189
free_plugin(proc);
990
1190
proc = next_plugin;
1191
1192
/* We are done modifying process list, so unblock signal */
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
1196
if(ret < 0){
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
1199
goto fallback;
1200
}
1201
1202
if(plugin_list == NULL){
1203
break;
1204
}
1205
991
1206
continue;
992
1207
}
993
1208
994
1209
/* This process exited nicely, so print its buffer */
995
1210
996
1211
bool bret = print_out_password(proc->buffer,
997
1212
proc->buffer_length);
998
1213
if(not bret){
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
1001
1216
}
1002
1217
goto fallback;
1003
1218
}
1010
1225
}
1011
1226
/* Before reading, make the process' data buffer large enough */
1012
1227
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1013
proc->buffer = realloc(proc->buffer, proc->buffer_size
1014
+ (size_t) BUFFER_SIZE);
1015
if (proc->buffer == NULL){
1016
perror("malloc");
1017
exitstatus = EXIT_FAILURE;
1228
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1229
+ (size_t) BUFFER_SIZE);
1230
if(new_buffer == NULL){
1231
error(0, errno, "malloc");
1232
exitstatus = EX_OSERR;
1018
1233
goto fallback;
1019
1234
}
1235
proc->buffer = new_buffer;
1020
1236
proc->buffer_size += BUFFER_SIZE;
1021
1237
}
1022
1238
/* Read from the process */
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
proc->buffer
1241
+ proc->buffer_length,
1242
BUFFER_SIZE));
1243
if(sret < 0){
1026
1244
/* Read error from this process; ignore the error */
1027
1245
proc = proc->next;
1028
1246
continue;
1029
1247
}
1030
if(ret == 0){
1248
if(sret == 0){
1031
1249
/* got EOF */
1032
1250
proc->eof = true;
1033
1251
} else {
1034
proc->buffer_length += (size_t) ret;
1252
proc->buffer_length += (size_t) sret;
1035
1253
}
1036
1254
}
1037
1255
}
1038
1039
1256
1257
1040
1258
fallback:
1041
1259
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1043
1262
/* Fallback if all plugins failed, none are found or an error
1044
1263
occured */
1045
1264
bool bret;
1053
1272
}
1054
1273
bret = print_out_password(passwordbuffer, len);
1055
1274
if(not bret){
1056
perror("print_out_password");
1057
exitstatus = EXIT_FAILURE;
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
1058
1277
}
1059
1278
}
1060
1279
1061
1280
/* Restore old signal handler */
1062
1281
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1063
1282
if(ret == -1){
1064
perror("sigaction");
1065
exitstatus = EXIT_FAILURE;
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
1066
1285
}
1067
1286
1068
1287
if(custom_argv != NULL){
1069
1288
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1070
1289
free(*arg);
1072
1291
free(custom_argv);
1073
1292
}
1074
1293
1075
if(dir != NULL){
1076
closedir(dir);
1294
free(direntries);
1295
1296
if(dir_fd != -1){
1297
close(dir_fd);
1077
1298
}
1078
1299
1079
/* Free the process list and kill the processes */
1300
/* Kill the processes */
1080
1301
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
1302
if(p->pid != 0){
1082
1303
close(p->fd);
1083
1304
ret = kill(p->pid, SIGTERM);
1084
1305
if(ret == -1 and errno != ESRCH){
1085
1306
/* Set-uid proccesses might not get closed */
1086
perror("kill");
1307
error(0, errno, "kill");
1087
1308
}
1088
1309
}
1089
1310
}
1090
1311
1091
1312
/* Wait for any remaining child processes to terminate */
1092
do{
1313
do {
1093
1314
ret = wait(NULL);
1094
1315
} while(ret >= 0);
1095
1316
if(errno != ECHILD){
1096
perror("wait");
1317
error(0, errno, "wait");
1097
1318
}
1098
1319
1099
1320
free_plugin_list();
1100
1321
1101
1322
free(plugindir);
1323
free(pluginhelperdir);
1102
1324
free(argfile);
1103
1325
1104
1326
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0