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- Committer: teddy at recompile
- Date: 2020-02-09 03:54:46 UTC
- Revision ID: teddy@recompile.se-20200209035446-kud6h0l6u30lo10h
Makefile: fix targets run-server & run-client with GnuTLS 3.5.9
* Makefile (keydir/tls-privkey.pem keydir/tls-pubkey.pem): If the TLS
session keys were not generated by mandos-keygen (which will happen
with GnuTLS version 3.5.9 or older), create dummy empty unused files
to avoid confusing make(1), which would otherwise re-run this target
and create new OpenPGP key files which would not match the key
fingerprint in the confdir/clients.conf file.
* Makefile (keydir/tls-privkey.pem keydir/tls-pubkey.pem): If the TLS
session keys were not generated by mandos-keygen (which will happen
with GnuTLS version 3.5.9 or older), create dummy empty unused files
to avoid confusing make(1), which would otherwise re-run this target
and create new OpenPGP key files which would not match the key
fingerprint in the confdir/clients.conf file.
- files added:
- .bzr-builddeb
- debian
- 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(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
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
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
156
196
/* Malloc check */
157
if(*array == NULL){
197
if(new_array == NULL){
158
198
return false;
159
199
}
200
*array = new_array;
160
201
/* Make a copy of the new string */
161
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
162
206
if(copy == NULL){
163
207
return false;
164
208
}
171
215
}
172
216
173
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
174
219
static bool add_argument(plugin *p, const char *arg){
175
220
if(p == NULL){
176
221
return false;
179
224
}
180
225
181
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
182
228
static bool add_environment(plugin *p, const char *def, bool replace){
183
229
if(p == NULL){
184
230
return false;
186
232
/* namelen = length of name of environment variable */
187
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
234
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
191
237
/* It already exists */
192
238
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
195
244
return false;
196
245
}
197
*e = new;
198
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
199
248
}
200
249
return true;
201
250
}
203
252
return add_to_char_array(def, &(p->environ), &(p->envc));
204
253
}
205
254
255
#ifndef O_CLOEXEC
206
256
/*
207
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
258
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
260
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
264
/* If reading the flags failed, return error indication now. */
215
265
if(ret < 0){
216
266
return ret;
217
267
}
218
268
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
220
271
}
272
#endif /* not O_CLOEXEC */
221
273
222
274
223
275
/* Mark processes as completed when they exit, and save their exit
224
276
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
226
279
while(true){
227
280
plugin *proc = plugin_list;
228
281
int status;
232
285
break;
233
286
}
234
287
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
237
291
}
238
/* No child processes */
239
break;
292
error(0, errno, "waitpid");
240
293
}
241
294
242
295
/* A child exited, find it in process_list */
248
301
continue;
249
302
}
250
303
proc->status = status;
251
proc->completed = true;
304
proc->completed = 1;
252
305
}
306
errno = old_errno;
253
307
}
254
308
255
309
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
257
312
ssize_t ret;
258
313
for(size_t written = 0; written < length; written += (size_t)ret){
259
314
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
266
321
}
267
322
268
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
269
325
static void free_plugin(plugin *plugin_node){
270
326
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
272
328
free(*arg);
273
329
}
330
free(plugin_node->name);
274
331
free(plugin_node->argv);
275
332
for(char **env = plugin_node->environ; *env != NULL; env++){
276
333
free(*env);
277
334
}
278
335
free(plugin_node->environ);
279
336
free(plugin_node->buffer);
280
337
281
338
/* Removes the plugin from the singly-linked list */
282
339
if(plugin_node == plugin_list){
283
340
/* First one - simple */
303
360
304
361
int main(int argc, char *argv[]){
305
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
306
364
char *argfile = NULL;
307
365
FILE *conffp;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
366
struct dirent **direntries = NULL;
311
367
struct stat st;
312
368
fd_set rfds_all;
313
369
int ret, maxfd = 0;
370
ssize_t sret;
314
371
uid_t uid = 65534;
315
372
gid_t gid = 65534;
316
373
bool debug = false;
320
377
.sa_flags = SA_NOCLDSTOP };
321
378
char **custom_argv = NULL;
322
379
int custom_argc = 0;
380
int dir_fd = -1;
323
381
324
382
/* Establish a signal handler */
325
383
sigemptyset(&sigchld_action.sa_mask);
326
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
385
if(ret == -1){
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
330
388
goto fallback;
331
389
}
332
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
391
if(ret == -1){
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
336
394
goto fallback;
337
395
}
338
396
370
428
.doc = "Group ID the plugins will run as", .group = 3 },
371
429
{ .name = "debug", .key = 132,
372
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
373
444
{ .name = NULL }
374
445
};
375
446
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
379
453
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;
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
389
459
}
390
460
}
461
errno = 0;
391
462
}
392
463
break;
393
464
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
399
467
}
400
468
break;
401
469
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
}
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
421
491
}
422
492
break;
423
493
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
494
{
428
495
char *envdef = strchr(arg, ':');
429
496
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
430
499
break;
431
500
}
432
501
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
502
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
435
510
}
436
511
}
437
512
break;
438
513
case 'd': /* --disable */
439
if (arg != NULL){
514
{
440
515
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
443
519
}
444
p->disabled = true;
445
520
}
446
521
break;
447
522
case 'e': /* --enable */
448
if (arg != NULL){
523
{
449
524
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
452
528
}
453
p->disabled = false;
454
529
}
455
530
break;
456
531
case 128: /* --plugin-dir */
457
532
free(plugindir);
458
533
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
534
if(plugindir != NULL){
535
errno = 0;
536
}
462
537
break;
463
538
case 129: /* --config-file */
464
539
/* This is already done by parse_opt_config_file() */
465
540
break;
466
541
case 130: /* --userid */
467
uid = (uid_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 != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
468
551
break;
469
552
case 131: /* --groupid */
470
gid = (gid_t)strtol(arg, NULL, 10);
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
471
562
break;
472
563
case 132: /* --debug */
473
564
debug = true;
474
565
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
475
593
case ARGP_KEY_ARG:
476
594
/* Cryptsetup always passes an argument, which is an empty
477
595
string if "none" was specified in /etc/crypttab. So if
478
596
argument was empty, we ignore it silently. */
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
597
if(arg[0] == '\0'){
598
break;
481
599
}
482
break;
483
case ARGP_KEY_END:
484
break;
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
485
605
default:
486
606
return ARGP_ERR_UNKNOWN;
487
607
}
488
return 0;
608
return errno; /* Set to 0 at start */
489
609
}
490
610
491
611
/* This option parser is the same as parse_opt() above, except it
492
612
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) {
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
497
618
case 'g': /* --global-options */
498
619
case 'G': /* --global-env */
499
620
case 'o': /* --options-for */
505
626
case 129: /* --config-file */
506
627
free(argfile);
507
628
argfile = strdup(arg);
508
if(argfile == NULL){
509
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
510
631
}
511
break;
632
break;
512
633
case 130: /* --userid */
513
634
case 131: /* --groupid */
514
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
515
640
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
517
641
break;
518
642
default:
519
643
return ARGP_ERR_UNKNOWN;
520
644
}
521
return 0;
645
return errno;
522
646
}
523
647
524
648
struct argp argp = { .options = options,
526
650
.args_doc = "",
527
651
.doc = "Mandos plugin runner -- Run plugins" };
528
652
529
/* Parse using the parse_opt_config_file in order to get the custom
653
/* Parse using parse_opt_config_file() in order to get the custom
530
654
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;
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
535
669
goto fallback;
536
670
}
537
671
539
673
argp.parser = parse_opt;
540
674
541
675
/* Open the configfile if available */
542
if (argfile == NULL){
676
if(argfile == NULL){
543
677
conffp = fopen(AFILE, "r");
544
678
} else {
545
679
conffp = fopen(argfile, "r");
546
}
680
}
547
681
if(conffp != NULL){
548
682
char *org_line = NULL;
549
683
char *p, *arg, *new_arg, *line;
550
684
size_t size = 0;
551
ssize_t sret;
552
685
const char whitespace_delims[] = " \r\t\f\v\n";
553
686
const char comment_delim[] = "#";
554
687
555
688
custom_argc = 1;
556
689
custom_argv = malloc(sizeof(char*) * 2);
557
690
if(custom_argv == NULL){
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
560
693
goto fallback;
561
694
}
562
695
custom_argv[0] = argv[0];
563
696
custom_argv[1] = NULL;
564
697
565
698
/* for each line in the config file, strip whitespace and ignore
566
699
commented text */
567
700
while(true){
569
702
if(sret == -1){
570
703
break;
571
704
}
572
705
573
706
line = org_line;
574
707
arg = strsep(&line, comment_delim);
575
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
578
711
}
579
712
new_arg = strdup(p);
580
713
if(new_arg == NULL){
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
583
716
free(org_line);
584
717
goto fallback;
585
718
}
586
719
587
720
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;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
595
744
}
596
745
custom_argv[custom_argc-1] = new_arg;
597
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
598
747
}
599
748
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
600
757
free(org_line);
601
758
} else {
602
759
/* Check for harmful errors and go to fallback. Other errors might
603
760
not affect opening plugins */
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
perror("fopen");
606
exitstatus = EXIT_FAILURE;
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
607
764
goto fallback;
608
765
}
609
766
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
612
769
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;
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
618
784
goto fallback;
619
785
}
620
786
}
621
787
622
788
/* Parse actual command line arguments, to let them override the
623
789
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;
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
629
823
}
630
824
631
825
if(debug){
632
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
633
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
634
828
p->name ? p->name : "Global", p->argc - 1);
635
829
for(char **a = p->argv; *a != NULL; a++){
636
830
fprintf(stderr, "\tArg: %s\n", *a);
637
831
}
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
639
833
for(char **a = p->environ; *a != NULL; a++){
640
834
fprintf(stderr, "\t%s\n", *a);
641
835
}
642
836
}
643
837
}
644
838
645
/* Strip permissions down to nobody */
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
646
868
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 */
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
668
874
{
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;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
676
919
}
677
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
678
931
}
679
932
680
933
FD_ZERO(&rfds_all);
681
934
682
935
/* 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
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
759
952
/* Ignore non-executable files */
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
761
956
if(debug){
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
763
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
764
961
}
765
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
766
964
continue;
767
965
}
768
966
769
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
770
968
if(p == NULL){
771
perror("getplugin");
772
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
773
972
continue;
774
973
}
775
974
if(p->disabled){
776
975
if(debug){
777
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
778
dirst->d_name);
977
direntries[i]->d_name);
779
978
}
780
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
781
981
continue;
782
982
}
783
983
{
786
986
if(g != NULL){
787
987
for(char **a = g->argv + 1; *a != NULL; a++){
788
988
if(not add_argument(p, *a)){
789
perror("add_argument");
989
error(0, errno, "add_argument");
790
990
}
791
991
}
792
992
/* Add global environment variables */
793
993
for(char **e = g->environ; *e != NULL; e++){
794
994
if(not add_environment(p, *e, false)){
795
perror("add_environment");
995
error(0, errno, "add_environment");
796
996
}
797
997
}
798
998
}
799
999
}
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. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
803
1002
if(p->environ[0] != NULL){
804
1003
for(char **e = environ; *e != NULL; e++){
805
1004
if(not add_environment(p, *e, false)){
806
perror("add_environment");
1005
error(0, errno, "add_environment");
807
1006
}
808
1007
}
809
1008
}
810
1009
811
1010
int pipefd[2];
812
ret = pipe(pipefd);
813
if (ret == -1){
814
perror("pipe");
815
exitstatus = EXIT_FAILURE;
816
goto fallback;
817
}
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
818
1032
/* Ask OS to automatic close the pipe on exec */
819
1033
ret = set_cloexec_flag(pipefd[0]);
820
1034
if(ret < 0){
821
perror("set_cloexec_flag");
822
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
823
1040
goto fallback;
824
1041
}
825
1042
ret = set_cloexec_flag(pipefd[1]);
826
1043
if(ret < 0){
827
perror("set_cloexec_flag");
828
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
829
1049
goto fallback;
830
1050
}
1051
#endif /* not O_CLOEXEC */
831
1052
/* Block SIGCHLD until process is safely in process list */
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
833
1056
if(ret < 0){
834
perror("sigprocmask");
835
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
836
1060
goto fallback;
837
1061
}
838
1062
/* Starting a new process to be watched */
839
pid_t pid = fork();
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
840
1067
if(pid == -1){
841
perror("fork");
842
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
843
1075
goto fallback;
844
1076
}
845
1077
if(pid == 0){
846
1078
/* this is the child process */
847
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
848
1080
if(ret < 0){
849
perror("sigaction");
850
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
851
1083
}
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
853
1085
if(ret < 0){
854
perror("sigprocmask");
855
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
856
1088
}
857
1089
858
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
859
1091
if(ret == -1){
860
perror("dup2");
861
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
862
1094
}
863
1095
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
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
879
1102
}
880
1103
/* no return */
881
1104
}
882
1105
/* Parent process */
883
1106
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);
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
889
1114
if(ret < 0){
890
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
891
1116
}
892
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
893
1119
goto fallback;
894
1120
}
1121
free(direntries[i]);
895
1122
896
1123
new_plugin->pid = pid;
897
1124
new_plugin->fd = pipefd[0];
898
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
899
1131
/* Unblock SIGCHLD so signal handler can be run if this process
900
1132
has already completed */
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
902
1136
if(ret < 0){
903
perror("sigprocmask");
904
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
905
1139
goto fallback;
906
1140
}
907
1141
908
1142
FD_SET(new_plugin->fd, &rfds_all);
909
1143
910
if (maxfd < new_plugin->fd){
1144
if(maxfd < new_plugin->fd){
911
1145
maxfd = new_plugin->fd;
912
1146
}
913
914
1147
}
915
1148
916
closedir(dir);
917
dir = NULL;
918
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
919
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
920
1156
if(p->pid != 0){
921
1157
break;
926
1162
free_plugin_list();
927
1163
}
928
1164
}
929
1165
930
1166
/* Main loop while running plugins exist */
931
1167
while(plugin_list){
932
1168
fd_set rfds = rfds_all;
933
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
if (select_ret == -1){
935
perror("select");
936
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
937
1173
goto fallback;
938
1174
}
939
1175
/* OK, now either a process completed, or something can be read
940
1176
from one of them */
941
1177
for(plugin *proc = plugin_list; proc != NULL;){
942
1178
/* Is this process completely done? */
943
if(proc->eof and proc->completed){
1179
if(proc->completed and proc->eof){
944
1180
/* Only accept the plugin output if it exited cleanly */
945
1181
if(not WIFEXITED(proc->status)
946
1182
or WEXITSTATUS(proc->status) != 0){
947
1183
/* Bad exit by plugin */
948
1184
949
1185
if(debug){
950
1186
if(WIFEXITED(proc->status)){
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
953
1190
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));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
961
1197
}
962
1198
}
963
1199
964
1200
/* Remove the plugin */
965
1201
FD_CLR(proc->fd, &rfds_all);
966
1202
967
1203
/* 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;
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
1208
if(ret < 0){
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
1211
goto fallback;
986
1212
}
987
1213
988
1214
plugin *next_plugin = proc->next;
989
1215
free_plugin(proc);
990
1216
proc = next_plugin;
1217
1218
/* We are done modifying process list, so unblock signal */
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
1222
if(ret < 0){
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1225
goto fallback;
1226
}
1227
1228
if(plugin_list == NULL){
1229
break;
1230
}
1231
991
1232
continue;
992
1233
}
993
1234
994
1235
/* This process exited nicely, so print its buffer */
995
1236
996
1237
bool bret = print_out_password(proc->buffer,
997
1238
proc->buffer_length);
998
1239
if(not bret){
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
1001
1242
}
1002
1243
goto fallback;
1003
1244
}
1010
1251
}
1011
1252
/* Before reading, make the process' data buffer large enough */
1012
1253
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;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1018
1259
goto fallback;
1019
1260
}
1261
proc->buffer = new_buffer;
1020
1262
proc->buffer_size += BUFFER_SIZE;
1021
1263
}
1022
1264
/* Read from the process */
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
1026
1270
/* Read error from this process; ignore the error */
1027
1271
proc = proc->next;
1028
1272
continue;
1029
1273
}
1030
if(ret == 0){
1274
if(sret == 0){
1031
1275
/* got EOF */
1032
1276
proc->eof = true;
1033
1277
} else {
1034
proc->buffer_length += (size_t) ret;
1278
proc->buffer_length += (size_t) sret;
1035
1279
}
1036
1280
}
1037
1281
}
1038
1039
1282
1283
1040
1284
fallback:
1041
1285
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1043
1288
/* Fallback if all plugins failed, none are found or an error
1044
1289
occured */
1045
1290
bool bret;
1053
1298
}
1054
1299
bret = print_out_password(passwordbuffer, len);
1055
1300
if(not bret){
1056
perror("print_out_password");
1057
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1058
1303
}
1059
1304
}
1060
1305
1061
1306
/* Restore old signal handler */
1062
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1063
1308
if(ret == -1){
1064
perror("sigaction");
1065
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1066
1311
}
1067
1312
1068
1313
if(custom_argv != NULL){
1069
1314
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1070
1315
free(*arg);
1072
1317
free(custom_argv);
1073
1318
}
1074
1319
1075
if(dir != NULL){
1076
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1077
1324
}
1078
1325
1079
/* Free the process list and kill the processes */
1326
/* Kill the processes */
1080
1327
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
1328
if(p->pid != 0){
1082
1329
close(p->fd);
1083
1330
ret = kill(p->pid, SIGTERM);
1084
1331
if(ret == -1 and errno != ESRCH){
1085
1332
/* Set-uid proccesses might not get closed */
1086
perror("kill");
1333
error(0, errno, "kill");
1087
1334
}
1088
1335
}
1089
1336
}
1090
1337
1091
1338
/* Wait for any remaining child processes to terminate */
1092
do{
1339
do {
1093
1340
ret = wait(NULL);
1094
1341
} while(ret >= 0);
1095
1342
if(errno != ECHILD){
1096
perror("wait");
1343
error(0, errno, "wait");
1097
1344
}
1098
1345
1099
1346
free_plugin_list();
1100
1347
1101
1348
free(plugindir);
1349
free(pluginhelperdir);
1102
1350
free(argfile);
1103
1351
1104
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0