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- Committer: Teddy Hogeborn
- Date: 2019-08-18 00:23:21 UTC
- Revision ID: teddy@recompile.se-20190818002321-qvjsogu0rhoyuwyc
Use the systemd sysusers.d mechanism, if present
* Makefile (SYSUSERS): New.
(install-server): Also install sysusers.d file, if $(SYSUSERS)
exists.
* debian/mandos.dirs (usr/lib/sysusers.d): New.
* sysusers.d-mandos.conf: New.
* Makefile (SYSUSERS): New.
(install-server): Also install sysusers.d file, if $(SYSUSERS)
exists.
* debian/mandos.dirs (usr/lib/sysusers.d): New.
* sysusers.d-mandos.conf: New.
- files added:
- DBUS-API
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 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>";
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
84
75
85
typedef struct plugin{
76
86
char *name; /* can be NULL or any plugin name */
79
89
char **environ;
80
90
int envc;
81
91
bool disabled;
82
92
83
93
/* Variables used for running processes*/
84
94
pid_t pid;
85
95
int fd;
87
97
size_t buffer_size;
88
98
size_t buffer_length;
89
99
bool eof;
90
volatile bool completed;
91
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
92
102
struct plugin *next;
93
103
} plugin;
94
104
96
106
97
107
/* Gets an existing plugin based on name,
98
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
99
110
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
102
if ((p->name == name)
103
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
104
115
return p;
105
116
}
106
117
}
107
118
/* Create a new plugin */
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
110
124
return NULL;
111
125
}
112
126
char *copy_name = NULL;
113
127
if(name != NULL){
114
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
115
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
116
135
return NULL;
117
136
}
118
137
}
119
138
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
124
143
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
127
149
free(copy_name);
128
150
free(new_plugin);
151
errno = e;
129
152
return NULL;
130
153
}
131
154
new_plugin->argv[0] = copy_name;
132
155
new_plugin->argv[1] = NULL;
133
156
134
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
135
160
if(new_plugin->environ == NULL){
161
int e = errno;
136
162
free(copy_name);
137
163
free(new_plugin->argv);
138
164
free(new_plugin);
165
errno = e;
139
166
return NULL;
140
167
}
141
168
new_plugin->environ[0] = NULL;
146
173
}
147
174
148
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
149
177
static bool add_to_char_array(const char *new, char ***array,
150
178
int *len){
151
179
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
154
185
/* Malloc check */
155
if(*array == NULL){
186
if(new_array == NULL){
156
187
return false;
157
188
}
189
*array = new_array;
158
190
/* Make a copy of the new string */
159
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
160
195
if(copy == NULL){
161
196
return false;
162
197
}
169
204
}
170
205
171
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
172
208
static bool add_argument(plugin *p, const char *arg){
173
209
if(p == NULL){
174
210
return false;
177
213
}
178
214
179
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
180
217
static bool add_environment(plugin *p, const char *def, bool replace){
181
218
if(p == NULL){
182
219
return false;
184
221
/* namelen = length of name of environment variable */
185
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
223
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
189
226
/* It already exists */
190
227
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
193
233
return false;
194
234
}
195
*e = new;
196
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
197
237
}
198
238
return true;
199
239
}
201
241
return add_to_char_array(def, &(p->environ), &(p->envc));
202
242
}
203
243
244
#ifndef O_CLOEXEC
204
245
/*
205
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
247
* Descriptor Flags".
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
249
*/
250
__attribute__((warn_unused_result))
209
251
static int set_cloexec_flag(int fd){
210
int ret = fcntl(fd, F_GETFD, 0);
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
253
/* If reading the flags failed, return error indication now. */
212
254
if(ret < 0){
213
255
return ret;
214
256
}
215
257
/* Store modified flag word in the descriptor. */
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
217
260
}
261
#endif /* not O_CLOEXEC */
218
262
219
263
220
264
/* Mark processes as completed when they exit, and save their exit
221
265
status. */
222
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
223
268
while(true){
224
269
plugin *proc = plugin_list;
225
270
int status;
229
274
break;
230
275
}
231
276
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
234
280
}
235
/* No child processes */
236
break;
281
error(0, errno, "waitpid");
237
282
}
238
283
239
284
/* A child exited, find it in process_list */
245
290
continue;
246
291
}
247
292
proc->status = status;
248
proc->completed = true;
293
proc->completed = 1;
249
294
}
295
errno = old_errno;
250
296
}
251
297
252
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
253
300
static bool print_out_password(const char *buffer, size_t length){
254
301
ssize_t ret;
255
302
for(size_t written = 0; written < length; written += (size_t)ret){
263
310
}
264
311
265
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
266
314
static void free_plugin(plugin *plugin_node){
267
315
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
269
317
free(*arg);
270
318
}
319
free(plugin_node->name);
271
320
free(plugin_node->argv);
272
321
for(char **env = plugin_node->environ; *env != NULL; env++){
273
322
free(*env);
274
323
}
275
324
free(plugin_node->environ);
276
325
free(plugin_node->buffer);
277
326
278
327
/* Removes the plugin from the singly-linked list */
279
328
if(plugin_node == plugin_list){
280
329
/* First one - simple */
300
349
301
350
int main(int argc, char *argv[]){
302
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
303
353
char *argfile = NULL;
304
354
FILE *conffp;
305
size_t d_name_len;
306
DIR *dir = NULL;
307
struct dirent *dirst;
355
struct dirent **direntries = NULL;
308
356
struct stat st;
309
357
fd_set rfds_all;
310
358
int ret, maxfd = 0;
359
ssize_t sret;
311
360
uid_t uid = 65534;
312
361
gid_t gid = 65534;
313
362
bool debug = false;
317
366
.sa_flags = SA_NOCLDSTOP };
318
367
char **custom_argv = NULL;
319
368
int custom_argc = 0;
369
int dir_fd = -1;
320
370
321
371
/* Establish a signal handler */
322
372
sigemptyset(&sigchld_action.sa_mask);
323
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
374
if(ret == -1){
325
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
327
377
goto fallback;
328
378
}
329
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
380
if(ret == -1){
331
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
333
383
goto fallback;
334
384
}
335
385
367
417
.doc = "Group ID the plugins will run as", .group = 3 },
368
418
{ .name = "debug", .key = 132,
369
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 },
370
433
{ .name = NULL }
371
434
};
372
435
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
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;
376
442
case 'g': /* --global-options */
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
381
continue;
382
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
386
448
}
387
449
}
450
errno = 0;
388
451
}
389
452
break;
390
453
case 'G': /* --global-env */
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
396
456
}
397
457
break;
398
458
case 'o': /* --options-for */
399
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
402
break;
403
}
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
406
break;
407
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
416
}
417
}
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;
418
480
}
419
481
break;
420
482
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
483
{
425
484
char *envdef = strchr(arg, ':');
426
485
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
427
488
break;
428
489
}
429
490
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
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;
432
499
}
433
500
}
434
501
break;
435
502
case 'd': /* --disable */
436
if (arg != NULL){
503
{
437
504
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
440
508
}
441
p->disabled = true;
442
509
}
443
510
break;
444
511
case 'e': /* --enable */
445
if (arg != NULL){
512
{
446
513
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
449
517
}
450
p->disabled = false;
451
518
}
452
519
break;
453
520
case 128: /* --plugin-dir */
454
521
free(plugindir);
455
522
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
523
if(plugindir != NULL){
524
errno = 0;
525
}
459
526
break;
460
527
case 129: /* --config-file */
461
528
/* This is already done by parse_opt_config_file() */
462
529
break;
463
530
case 130: /* --userid */
464
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;
465
540
break;
466
541
case 131: /* --groupid */
467
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;
468
551
break;
469
552
case 132: /* --debug */
470
553
debug = true;
471
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
*/
472
582
case ARGP_KEY_ARG:
473
583
/* Cryptsetup always passes an argument, which is an empty
474
584
string if "none" was specified in /etc/crypttab. So if
475
585
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
586
if(arg[0] == '\0'){
587
break;
478
588
}
479
break;
480
case ARGP_KEY_END:
481
break;
589
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
482
594
default:
483
595
return ARGP_ERR_UNKNOWN;
484
596
}
485
return 0;
597
return errno; /* Set to 0 at start */
486
598
}
487
599
488
600
/* This option parser is the same as parse_opt() above, except it
489
601
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
602
error_t parse_opt_config_file(int key, char *arg,
603
__attribute__((unused))
604
struct argp_state *state){
605
errno = 0;
606
switch(key){
494
607
case 'g': /* --global-options */
495
608
case 'G': /* --global-env */
496
609
case 'o': /* --options-for */
502
615
case 129: /* --config-file */
503
616
free(argfile);
504
617
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
618
if(argfile != NULL){
619
errno = 0;
507
620
}
508
break;
621
break;
509
622
case 130: /* --userid */
510
623
case 131: /* --groupid */
511
624
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
512
629
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
630
break;
515
631
default:
516
632
return ARGP_ERR_UNKNOWN;
517
633
}
518
return 0;
634
return errno;
519
635
}
520
636
521
637
struct argp argp = { .options = options,
523
639
.args_doc = "",
524
640
.doc = "Mandos plugin runner -- Run plugins" };
525
641
526
/* Parse using the parse_opt_config_file in order to get the custom
642
/* Parse using parse_opt_config_file() in order to get the custom
527
643
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
530
fprintf(stderr, "Unknown error while parsing arguments\n");
531
exitstatus = EXIT_FAILURE;
644
ret = argp_parse(&argp, argc, argv,
645
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
NULL, NULL);
647
switch(ret){
648
case 0:
649
break;
650
case ENOMEM:
651
default:
652
errno = ret;
653
error(0, errno, "argp_parse");
654
exitstatus = EX_OSERR;
655
goto fallback;
656
case EINVAL:
657
exitstatus = EX_USAGE;
532
658
goto fallback;
533
659
}
534
660
536
662
argp.parser = parse_opt;
537
663
538
664
/* Open the configfile if available */
539
if (argfile == NULL){
665
if(argfile == NULL){
540
666
conffp = fopen(AFILE, "r");
541
667
} else {
542
668
conffp = fopen(argfile, "r");
543
}
669
}
544
670
if(conffp != NULL){
545
671
char *org_line = NULL;
546
672
char *p, *arg, *new_arg, *line;
547
673
size_t size = 0;
548
ssize_t sret;
549
674
const char whitespace_delims[] = " \r\t\f\v\n";
550
675
const char comment_delim[] = "#";
551
676
552
677
custom_argc = 1;
553
678
custom_argv = malloc(sizeof(char*) * 2);
554
679
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
557
682
goto fallback;
558
683
}
559
684
custom_argv[0] = argv[0];
560
685
custom_argv[1] = NULL;
561
686
562
687
/* for each line in the config file, strip whitespace and ignore
563
688
commented text */
564
689
while(true){
566
691
if(sret == -1){
567
692
break;
568
693
}
569
694
570
695
line = org_line;
571
696
arg = strsep(&line, comment_delim);
572
697
while((p = strsep(&arg, whitespace_delims)) != NULL){
575
700
}
576
701
new_arg = strdup(p);
577
702
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
580
705
free(org_line);
581
706
goto fallback;
582
707
}
583
708
584
709
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
592
722
}
593
723
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
724
custom_argv[custom_argc] = NULL;
595
725
}
596
726
}
727
do {
728
ret = fclose(conffp);
729
} while(ret == EOF and errno == EINTR);
730
if(ret == EOF){
731
error(0, errno, "fclose");
732
exitstatus = EX_IOERR;
733
goto fallback;
734
}
597
735
free(org_line);
598
736
} else {
599
737
/* Check for harmful errors and go to fallback. Other errors might
600
738
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
604
742
goto fallback;
605
743
}
606
744
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
609
747
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
748
ret = argp_parse(&argp, custom_argc, custom_argv,
749
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
NULL, NULL);
751
switch(ret){
752
case 0:
753
break;
754
case ENOMEM:
755
default:
756
errno = ret;
757
error(0, errno, "argp_parse");
758
exitstatus = EX_OSERR;
759
goto fallback;
760
case EINVAL:
761
exitstatus = EX_CONFIG;
615
762
goto fallback;
616
763
}
617
764
}
618
765
619
766
/* Parse actual command line arguments, to let them override the
620
767
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
768
ret = argp_parse(&argp, argc, argv,
769
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
NULL, NULL);
771
switch(ret){
772
case 0:
773
break;
774
case ENOMEM:
775
default:
776
errno = ret;
777
error(0, errno, "argp_parse");
778
exitstatus = EX_OSERR;
779
goto fallback;
780
case EINVAL:
781
exitstatus = EX_USAGE;
782
goto fallback;
783
}
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
800
}
626
801
}
627
802
628
803
if(debug){
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
630
805
fprintf(stderr, "Plugin: %s has %d arguments\n",
631
806
p->name ? p->name : "Global", p->argc - 1);
632
807
for(char **a = p->argv; *a != NULL; a++){
633
808
fprintf(stderr, "\tArg: %s\n", *a);
634
809
}
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
811
for(char **a = p->environ; *a != NULL; a++){
637
812
fprintf(stderr, "\t%s\n", *a);
638
813
}
639
814
}
640
815
}
641
816
642
/* Strip permissions down to nobody */
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
843
if(ret == -1){
844
error(0, errno, "setgid");
845
}
643
846
ret = setuid(uid);
644
if (ret == -1){
645
perror("setuid");
646
}
647
setgid(gid);
648
if (ret == -1){
649
perror("setgid");
650
}
651
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
658
if(dir == NULL){
659
perror("Could not open plugin dir");
660
exitstatus = EXIT_FAILURE;
661
goto fallback;
662
}
663
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
665
852
{
666
int dir_fd = dirfd(dir);
667
if(dir_fd >= 0){
668
ret = set_cloexec_flag(dir_fd);
669
if(ret < 0){
670
perror("set_cloexec_flag");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
860
if(dir_fd == -1){
861
error(0, errno, "Could not open plugin dir");
862
exitstatus = EX_UNAVAILABLE;
863
goto fallback;
864
}
865
866
#ifndef O_CLOEXEC
867
/* Set the FD_CLOEXEC flag on the directory */
868
ret = set_cloexec_flag(dir_fd);
869
if(ret < 0){
870
error(0, errno, "set_cloexec_flag");
871
exitstatus = EX_OSERR;
872
goto fallback;
873
}
874
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
673
897
}
674
898
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
675
909
}
676
910
677
911
FD_ZERO(&rfds_all);
678
912
679
913
/* Read and execute any executable in the plugin directory*/
680
while(true){
681
dirst = readdir(dir);
682
683
/* All directory entries have been processed */
684
if(dirst == NULL){
685
if (errno == EBADF){
686
perror("readdir");
687
exitstatus = EXIT_FAILURE;
688
goto fallback;
689
}
690
break;
691
}
692
693
d_name_len = strlen(dirst->d_name);
694
695
/* Ignore dotfiles, backup files and other junk */
696
{
697
bool bad_name = false;
698
699
const char const *bad_prefixes[] = { ".", "#", NULL };
700
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
702
".dpkg-old",
703
".dpkg-divert", NULL };
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
705
size_t pre_len = strlen(*pre);
706
if((d_name_len >= pre_len)
707
and strncmp((dirst->d_name), *pre, pre_len) == 0){
708
if(debug){
709
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
710
" with bad prefix %s\n", dirst->d_name, *pre);
711
}
712
bad_name = true;
713
break;
714
}
715
}
716
if(bad_name){
717
continue;
718
}
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
size_t suf_len = strlen(*suf);
721
if((d_name_len >= suf_len)
722
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
723
== 0)){
724
if(debug){
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
726
" with bad suffix %s\n", dirst->d_name, *suf);
727
}
728
bad_name = true;
729
break;
730
}
731
}
732
733
if(bad_name){
734
continue;
735
}
736
}
737
738
char *filename;
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
744
if(ret < 0){
745
perror("asprintf");
746
continue;
747
}
748
749
ret = stat(filename, &st);
750
if (ret == -1){
751
perror("stat");
752
free(filename);
753
continue;
754
}
755
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
free(direntries[i]);
920
continue;
921
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
923
if(ret == -1){
924
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
927
continue;
928
}
929
756
930
/* Ignore non-executable files */
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
931
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
758
934
if(debug){
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
760
" with bad type or mode\n", filename);
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
761
939
}
762
free(filename);
940
close(plugin_fd);
941
free(direntries[i]);
763
942
continue;
764
943
}
765
944
766
plugin *p = getplugin(dirst->d_name);
945
plugin *p = getplugin(direntries[i]->d_name);
767
946
if(p == NULL){
768
perror("getplugin");
769
free(filename);
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
770
950
continue;
771
951
}
772
952
if(p->disabled){
773
953
if(debug){
774
954
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
775
dirst->d_name);
955
direntries[i]->d_name);
776
956
}
777
free(filename);
957
close(plugin_fd);
958
free(direntries[i]);
778
959
continue;
779
960
}
780
961
{
783
964
if(g != NULL){
784
965
for(char **a = g->argv + 1; *a != NULL; a++){
785
966
if(not add_argument(p, *a)){
786
perror("add_argument");
967
error(0, errno, "add_argument");
787
968
}
788
969
}
789
970
/* Add global environment variables */
790
971
for(char **e = g->environ; *e != NULL; e++){
791
972
if(not add_environment(p, *e, false)){
792
perror("add_environment");
973
error(0, errno, "add_environment");
793
974
}
794
975
}
795
976
}
796
977
}
797
/* If this plugin has any environment variables, we will call
798
using execve and need to duplicate the environment from this
799
process, too. */
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
800
980
if(p->environ[0] != NULL){
801
981
for(char **e = environ; *e != NULL; e++){
802
982
if(not add_environment(p, *e, false)){
803
perror("add_environment");
983
error(0, errno, "add_environment");
804
984
}
805
985
}
806
986
}
807
987
808
988
int pipefd[2];
809
ret = pipe(pipefd);
810
if (ret == -1){
811
perror("pipe");
812
exitstatus = EXIT_FAILURE;
813
goto fallback;
814
}
989
#ifndef O_CLOEXEC
990
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
if(ret == -1){
995
error(0, errno, "pipe");
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
815
1010
/* Ask OS to automatic close the pipe on exec */
816
1011
ret = set_cloexec_flag(pipefd[0]);
817
1012
if(ret < 0){
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
820
1018
goto fallback;
821
1019
}
822
1020
ret = set_cloexec_flag(pipefd[1]);
823
1021
if(ret < 0){
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
826
1027
goto fallback;
827
1028
}
1029
#endif /* not O_CLOEXEC */
828
1030
/* Block SIGCHLD until process is safely in process list */
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
830
1034
if(ret < 0){
831
perror("sigprocmask");
832
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
833
1038
goto fallback;
834
1039
}
835
1040
/* Starting a new process to be watched */
836
pid_t pid = fork();
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
837
1045
if(pid == -1){
838
perror("fork");
839
exitstatus = EXIT_FAILURE;
1046
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
840
1053
goto fallback;
841
1054
}
842
1055
if(pid == 0){
843
1056
/* this is the child process */
844
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
845
1058
if(ret < 0){
846
perror("sigaction");
847
_exit(EXIT_FAILURE);
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
848
1061
}
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
1063
if(ret < 0){
851
perror("sigprocmask");
852
_exit(EXIT_FAILURE);
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
853
1066
}
854
1067
855
1068
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
856
1069
if(ret == -1){
857
perror("dup2");
858
_exit(EXIT_FAILURE);
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
859
1072
}
860
1073
861
if(dirfd(dir) < 0){
862
/* If dir has no file descriptor, we could not set FD_CLOEXEC
863
above and must now close it manually here. */
864
closedir(dir);
865
}
866
if(p->environ[0] == NULL){
867
if(execv(filename, p->argv) < 0){
868
perror("execv");
869
_exit(EXIT_FAILURE);
870
}
871
} else {
872
if(execve(filename, p->argv, p->environ) < 0){
873
perror("execve");
874
_exit(EXIT_FAILURE);
875
}
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_exit(EX_OSERR);
876
1080
}
877
1081
/* no return */
878
1082
}
879
1083
/* Parent process */
880
1084
close(pipefd[1]); /* Close unused write end of pipe */
881
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
close(plugin_fd);
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
if(new_plugin == NULL){
1088
error(0, errno, "getplugin");
1089
ret = (int)(TEMP_FAILURE_RETRY
1090
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1091
NULL)));
886
1092
if(ret < 0){
887
perror("sigprocmask");
1093
error(0, errno, "sigprocmask");
888
1094
}
889
exitstatus = EXIT_FAILURE;
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
890
1097
goto fallback;
891
1098
}
1099
free(direntries[i]);
892
1100
893
1101
new_plugin->pid = pid;
894
1102
new_plugin->fd = pipefd[0];
895
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
896
1109
/* Unblock SIGCHLD so signal handler can be run if this process
897
1110
has already completed */
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
899
1114
if(ret < 0){
900
perror("sigprocmask");
901
exitstatus = EXIT_FAILURE;
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
902
1117
goto fallback;
903
1118
}
904
1119
905
1120
FD_SET(new_plugin->fd, &rfds_all);
906
1121
907
if (maxfd < new_plugin->fd){
1122
if(maxfd < new_plugin->fd){
908
1123
maxfd = new_plugin->fd;
909
1124
}
910
911
1125
}
912
1126
913
closedir(dir);
914
dir = NULL;
915
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
916
1133
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
1134
if(p->pid != 0){
918
1135
break;
923
1140
free_plugin_list();
924
1141
}
925
1142
}
926
1143
927
1144
/* Main loop while running plugins exist */
928
1145
while(plugin_list){
929
1146
fd_set rfds = rfds_all;
930
1147
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
if (select_ret == -1){
932
perror("select");
933
exitstatus = EXIT_FAILURE;
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
934
1151
goto fallback;
935
1152
}
936
1153
/* OK, now either a process completed, or something can be read
937
1154
from one of them */
938
1155
for(plugin *proc = plugin_list; proc != NULL;){
939
1156
/* Is this process completely done? */
940
if(proc->eof and proc->completed){
1157
if(proc->completed and proc->eof){
941
1158
/* Only accept the plugin output if it exited cleanly */
942
1159
if(not WIFEXITED(proc->status)
943
1160
or WEXITSTATUS(proc->status) != 0){
944
1161
/* Bad exit by plugin */
945
1162
946
1163
if(debug){
947
1164
if(WIFEXITED(proc->status)){
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
950
1168
WEXITSTATUS(proc->status));
951
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
954
WTERMSIG(proc->status));
955
} else if(WCOREDUMP(proc->status)){
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
1169
} else if(WIFSIGNALED(proc->status)){
1170
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1171
" signal %d: %s\n", proc->name,
1172
(intmax_t) (proc->pid),
1173
WTERMSIG(proc->status),
1174
strsignal(WTERMSIG(proc->status)));
958
1175
}
959
1176
}
960
1177
961
1178
/* Remove the plugin */
962
1179
FD_CLR(proc->fd, &rfds_all);
963
1180
964
1181
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
if(ret < 0){
967
perror("sigprocmask");
968
exitstatus = EXIT_FAILURE;
969
goto fallback;
970
}
971
972
/* We are done modifying process list, so unblock signal */
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
NULL);
975
if(ret < 0){
976
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
1186
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1189
goto fallback;
983
1190
}
984
1191
985
1192
plugin *next_plugin = proc->next;
986
1193
free_plugin(proc);
987
1194
proc = next_plugin;
1195
1196
/* We are done modifying process list, so unblock signal */
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
1200
if(ret < 0){
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
1203
goto fallback;
1204
}
1205
1206
if(plugin_list == NULL){
1207
break;
1208
}
1209
988
1210
continue;
989
1211
}
990
1212
991
1213
/* This process exited nicely, so print its buffer */
992
1214
993
1215
bool bret = print_out_password(proc->buffer,
994
1216
proc->buffer_length);
995
1217
if(not bret){
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
998
1220
}
999
1221
goto fallback;
1000
1222
}
1007
1229
}
1008
1230
/* Before reading, make the process' data buffer large enough */
1009
1231
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1235
error(0, errno, "malloc");
1236
exitstatus = EX_OSERR;
1015
1237
goto fallback;
1016
1238
}
1239
proc->buffer = new_buffer;
1017
1240
proc->buffer_size += BUFFER_SIZE;
1018
1241
}
1019
1242
/* Read from the process */
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
1023
1248
/* Read error from this process; ignore the error */
1024
1249
proc = proc->next;
1025
1250
continue;
1026
1251
}
1027
if(ret == 0){
1252
if(sret == 0){
1028
1253
/* got EOF */
1029
1254
proc->eof = true;
1030
1255
} else {
1031
proc->buffer_length += (size_t) ret;
1256
proc->buffer_length += (size_t) sret;
1032
1257
}
1033
1258
}
1034
1259
}
1035
1036
1260
1261
1037
1262
fallback:
1038
1263
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
1040
1266
/* Fallback if all plugins failed, none are found or an error
1041
1267
occured */
1042
1268
bool bret;
1050
1276
}
1051
1277
bret = print_out_password(passwordbuffer, len);
1052
1278
if(not bret){
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
1055
1281
}
1056
1282
}
1057
1283
1058
1284
/* Restore old signal handler */
1059
1285
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
1286
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
1063
1289
}
1064
1290
1065
1291
if(custom_argv != NULL){
1066
1292
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
1293
free(*arg);
1069
1295
free(custom_argv);
1070
1296
}
1071
1297
1072
if(dir != NULL){
1073
closedir(dir);
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1074
1302
}
1075
1303
1076
/* Free the process list and kill the processes */
1304
/* Kill the processes */
1077
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
1306
if(p->pid != 0){
1079
1307
close(p->fd);
1080
1308
ret = kill(p->pid, SIGTERM);
1081
1309
if(ret == -1 and errno != ESRCH){
1082
1310
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1311
error(0, errno, "kill");
1084
1312
}
1085
1313
}
1086
1314
}
1087
1315
1088
1316
/* Wait for any remaining child processes to terminate */
1089
do{
1317
do {
1090
1318
ret = wait(NULL);
1091
1319
} while(ret >= 0);
1092
1320
if(errno != ECHILD){
1093
perror("wait");
1321
error(0, errno, "wait");
1094
1322
}
1095
1323
1096
1324
free_plugin_list();
1097
1325
1098
1326
free(plugindir);
1327
free(pluginhelperdir);
1099
1328
free(argfile);
1100
1329
1101
1330
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0