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- Committer: Teddy Hogeborn
- Date: 2016-03-19 21:51:01 UTC
- mfrom: (237.7.390 trunk)
- Revision ID: teddy@recompile.se-20160319215101-sw7h1dvhpvadw2mb
Merge from trunk
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
66
70
program_invocation_short_name */
67
71
#include <time.h> /* nanosleep(), time(), sleep() */
68
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
77
*/
74
78
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
79
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
78
83
#include <iso646.h> /* not, or, and */
79
84
#include <argp.h> /* struct argp_option, error_t, struct
80
85
argp_state, struct argp,
92
97
argz_delete(), argz_append(),
93
98
argz_stringify(), argz_add(),
94
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
95
102
96
103
#ifdef __linux__
97
104
#include <sys/klog.h> /* klogctl() */
139
146
static const char sys_class_net[] = "/sys/class/net";
140
147
char *connect_to = NULL;
141
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
142
150
uid_t uid = 65534;
143
151
gid_t gid = 65534;
144
152
145
153
/* Doubly linked list that need to be circularly linked when used */
146
154
typedef struct server{
147
155
const char *ip;
148
uint16_t port;
156
in_port_t port;
149
157
AvahiIfIndex if_index;
150
158
int af;
151
159
struct timespec last_seen;
155
163
156
164
/* Used for passing in values through the Avahi callback functions */
157
165
typedef struct {
158
AvahiSimplePoll *simple_poll;
159
166
AvahiServer *server;
160
167
gnutls_certificate_credentials_t cred;
161
168
unsigned int dh_bits;
163
170
const char *priority;
164
171
gpgme_ctx_t ctx;
165
172
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
166
175
} mandos_context;
167
176
168
/* global context so signal handler can reach it*/
169
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
173
179
174
180
sig_atomic_t quit_now = 0;
175
181
int signal_received = 0;
183
189
perror(print_text);
184
190
}
185
191
186
__attribute__((format (gnu_printf, 2, 3)))
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
193
int fprintf_plus(FILE *stream, const char *format, ...){
188
194
va_list ap;
189
195
va_start (ap, format);
190
196
191
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
198
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
200
}
195
201
196
202
/*
198
204
* bytes. "buffer_capacity" is how much is currently allocated,
199
205
* "buffer_length" is how much is already used.
200
206
*/
207
__attribute__((nonnull, warn_unused_result))
201
208
size_t incbuffer(char **buffer, size_t buffer_length,
202
209
size_t buffer_capacity){
203
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(buffer == NULL){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
206
217
return 0;
207
218
}
219
*buffer = new_buf;
208
220
buffer_capacity += BUFFER_SIZE;
209
221
}
210
222
return buffer_capacity;
211
223
}
212
224
213
225
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
216
229
int ret;
217
230
server *new_server = malloc(sizeof(server));
218
231
if(new_server == NULL){
225
238
.af = af };
226
239
if(new_server->ip == NULL){
227
240
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
228
256
return false;
229
257
}
230
258
/* Special case of first server */
231
if (mc.current_server == NULL){
259
if(*current_server == NULL){
232
260
new_server->next = new_server;
233
261
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
262
*current_server = new_server;
236
263
} else {
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
239
267
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
268
(*current_server)->prev = new_server;
246
269
}
247
270
return true;
248
271
}
250
273
/*
251
274
* Initialize GPGME.
252
275
*/
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
255
281
gpgme_error_t rc;
256
282
gpgme_engine_info_t engine_info;
257
283
258
259
284
/*
260
285
* Helper function to insert pub and seckey to the engine keyring.
261
286
*/
262
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
263
288
int ret;
264
289
int fd;
265
290
gpgme_data_t pgp_data;
277
302
return false;
278
303
}
279
304
280
rc = gpgme_op_import(mc.ctx, pgp_data);
305
rc = gpgme_op_import(mc->ctx, pgp_data);
281
306
if(rc != GPG_ERR_NO_ERROR){
282
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
308
gpgme_strsource(rc), gpgme_strerror(rc));
284
309
return false;
285
310
}
286
311
287
ret = (int)TEMP_FAILURE_RETRY(close(fd));
312
ret = close(fd);
288
313
if(ret == -1){
289
314
perror_plus("close");
290
315
}
327
352
}
328
353
329
354
/* Create new GPGME "context" */
330
rc = gpgme_new(&(mc.ctx));
355
rc = gpgme_new(&(mc->ctx));
331
356
if(rc != GPG_ERR_NO_ERROR){
332
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
346
371
* Decrypt OpenPGP data.
347
372
* Returns -1 on error
348
373
*/
374
__attribute__((nonnull, warn_unused_result))
349
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
350
376
size_t crypto_size,
351
char **plaintext){
377
char **plaintext,
378
mandos_context *mc){
352
379
gpgme_data_t dh_crypto, dh_plain;
353
380
gpgme_error_t rc;
354
381
ssize_t ret;
380
407
381
408
/* Decrypt data from the cryptotext data buffer to the plaintext
382
409
data buffer */
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
384
411
if(rc != GPG_ERR_NO_ERROR){
385
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
413
gpgme_strsource(rc), gpgme_strerror(rc));
387
414
plaintext_length = -1;
388
415
if(debug){
389
416
gpgme_decrypt_result_t result;
390
result = gpgme_op_decrypt_result(mc.ctx);
417
result = gpgme_op_decrypt_result(mc->ctx);
391
418
if(result == NULL){
392
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
393
420
} else {
470
497
return plaintext_length;
471
498
}
472
499
473
static const char * safer_gnutls_strerror(int value){
474
const char *ret = gnutls_strerror(value); /* Spurious warning from
475
-Wunreachable-code */
476
if(ret == NULL)
477
ret = "(unknown)";
478
return ret;
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
479
511
}
480
512
481
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
482
515
static void debuggnutls(__attribute__((unused)) int level,
483
516
const char* string){
484
517
fprintf_plus(stderr, "GnuTLS: %s", string);
485
518
}
486
519
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
487
521
static int init_gnutls_global(const char *pubkeyfilename,
488
const char *seckeyfilename){
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
489
525
int ret;
526
unsigned int uret;
490
527
491
528
if(debug){
492
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
493
530
}
494
531
495
ret = gnutls_global_init();
496
if(ret != GNUTLS_E_SUCCESS){
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
499
return -1;
500
}
501
502
532
if(debug){
503
533
/* "Use a log level over 10 to enable all debugging options."
504
534
* - GnuTLS manual
508
538
}
509
539
510
540
/* OpenPGP credentials */
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
512
542
if(ret != GNUTLS_E_SUCCESS){
513
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
544
safer_gnutls_strerror(ret));
515
gnutls_global_deinit();
516
545
return -1;
517
546
}
518
547
524
553
}
525
554
526
555
ret = gnutls_certificate_set_openpgp_key_file
527
(mc.cred, pubkeyfilename, seckeyfilename,
556
(mc->cred, pubkeyfilename, seckeyfilename,
528
557
GNUTLS_OPENPGP_FMT_BASE64);
529
558
if(ret != GNUTLS_E_SUCCESS){
530
559
fprintf_plus(stderr,
536
565
}
537
566
538
567
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
568
ret = gnutls_dh_params_init(&mc->dh_params);
540
569
if(ret != GNUTLS_E_SUCCESS){
541
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
571
" initialization: %s\n",
543
572
safer_gnutls_strerror(ret));
544
573
goto globalfail;
545
574
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
goto globalfail;
551
}
552
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
748
555
749
return 0;
556
750
557
751
globalfail:
558
752
559
gnutls_certificate_free_credentials(mc.cred);
560
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
562
755
return -1;
563
756
}
564
757
565
static int init_gnutls_session(gnutls_session_t *session){
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
566
761
int ret;
567
762
/* GnuTLS session creation */
568
763
do {
580
775
{
581
776
const char *err;
582
777
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
779
if(quit_now){
585
780
gnutls_deinit(*session);
586
781
return -1;
597
792
598
793
do {
599
794
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
600
mc.cred);
795
mc->cred);
601
796
if(quit_now){
602
797
gnutls_deinit(*session);
603
798
return -1;
613
808
/* ignore client certificate if any. */
614
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
615
810
616
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
617
618
811
return 0;
619
812
}
620
813
622
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
623
816
__attribute__((unused)) const char *txt){}
624
817
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
625
1036
/* Called when a Mandos server is found */
626
static int start_mandos_communication(const char *ip, uint16_t port,
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
627
1039
AvahiIfIndex if_index,
628
int af){
1040
int af, mandos_context *mc){
629
1041
int ret, tcp_sd = -1;
630
1042
ssize_t sret;
631
union {
632
struct sockaddr_in in;
633
struct sockaddr_in6 in6;
634
} to;
1043
struct sockaddr_storage to;
635
1044
char *buffer = NULL;
636
1045
char *decrypted_buffer = NULL;
637
1046
size_t buffer_length = 0;
640
1049
int retval = -1;
641
1050
gnutls_session_t session;
642
1051
int pf; /* Protocol family */
1052
bool route_added = false;
643
1053
644
1054
errno = 0;
645
1055
661
1071
return -1;
662
1072
}
663
1073
664
ret = init_gnutls_session(&session);
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
ret = init_gnutls_session(&session, mc);
665
1107
if(ret != 0){
666
1108
return -1;
667
1109
}
668
1110
669
1111
if(debug){
670
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
1113
PRIuMAX "\n", ip, (uintmax_t)port);
672
1114
}
673
1115
674
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
675
1117
if(tcp_sd < 0){
676
1118
int e = errno;
677
1119
perror_plus("socket");
684
1126
goto mandos_end;
685
1127
}
686
1128
687
memset(&to, 0, sizeof(to));
688
1129
if(af == AF_INET6){
689
to.in6.sin6_family = (sa_family_t)af;
690
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
691
1133
} else { /* IPv4 */
692
to.in.sin_family = (sa_family_t)af;
693
ret = inet_pton(af, ip, &to.in.sin_addr);
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
694
1137
}
695
1138
if(ret < 0 ){
696
1139
int e = errno;
705
1148
goto mandos_end;
706
1149
}
707
1150
if(af == AF_INET6){
708
to.in6.sin6_port = htons(port); /* Spurious warnings from
709
-Wconversion and
710
-Wunreachable-code */
711
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
715
1154
if(if_index == AVAHI_IF_UNSPEC){
716
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
717
1156
" incomplete without a network interface\n");
719
1158
goto mandos_end;
720
1159
}
721
1160
/* Set the network interface number as scope */
722
to.in6.sin6_scope_id = (uint32_t)if_index;
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
723
1162
}
724
1163
} else {
725
to.in.sin_port = htons(port); /* Spurious warnings from
726
-Wconversion and
727
-Wunreachable-code */
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
728
1165
}
729
1166
730
1167
if(quit_now){
738
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
1176
perror_plus("if_indextoname");
740
1177
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
743
1180
}
744
1181
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
747
1184
}
748
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
const char *pcret;
751
if(af == AF_INET6){
752
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
753
sizeof(addrstr));
754
} else {
755
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
756
sizeof(addrstr));
757
}
758
if(pcret == NULL){
759
perror_plus("inet_ntop");
760
} else {
761
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
763
}
764
}
765
}
766
767
if(quit_now){
768
errno = EINTR;
769
goto mandos_end;
770
}
771
772
if(af == AF_INET6){
773
ret = connect(tcp_sd, &to.in6, sizeof(to));
774
} else {
775
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
776
}
777
if(ret < 0){
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
int e = errno;
780
perror_plus("connect");
781
errno = e;
782
}
783
goto mandos_end;
784
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
789
1267
}
790
1268
791
1269
const char *out = mandos_protocol_version;
942
1420
if(buffer_length > 0){
943
1421
ssize_t decrypted_buffer_size;
944
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
945
&decrypted_buffer);
1423
&decrypted_buffer, mc);
946
1424
if(decrypted_buffer_size >= 0){
947
1425
948
1426
written = 0;
974
1452
975
1453
mandos_end:
976
1454
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
977
1461
int e = errno;
978
1462
free(decrypted_buffer);
979
1463
free(buffer);
980
1464
if(tcp_sd >= 0){
981
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1465
ret = close(tcp_sd);
982
1466
}
983
1467
if(ret == -1){
984
1468
if(e == 0){
996
1480
return retval;
997
1481
}
998
1482
1483
__attribute__((nonnull))
999
1484
static void resolve_callback(AvahiSServiceResolver *r,
1000
1485
AvahiIfIndex interface,
1001
1486
AvahiProtocol proto,
1009
1494
AVAHI_GCC_UNUSED AvahiStringList *txt,
1010
1495
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1011
1496
flags,
1012
AVAHI_GCC_UNUSED void* userdata){
1013
assert(r);
1497
void *mc){
1498
if(r == NULL){
1499
return;
1500
}
1014
1501
1015
1502
/* Called whenever a service has been resolved successfully or
1016
1503
timed out */
1017
1504
1018
1505
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1019
1507
return;
1020
1508
}
1021
1509
1025
1513
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
1514
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
1515
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
1516
avahi_strerror(avahi_server_errno
1517
(((mandos_context*)mc)->server)));
1029
1518
break;
1030
1519
1031
1520
case AVAHI_RESOLVER_FOUND:
1037
1526
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
1527
host_name, ip, (intmax_t)interface, port);
1039
1528
}
1040
int ret = start_mandos_communication(ip, port, interface,
1041
avahi_proto_to_af(proto));
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1530
interface,
1531
avahi_proto_to_af(proto),
1532
mc);
1042
1533
if(ret == 0){
1043
avahi_simple_poll_quit(mc.simple_poll);
1534
avahi_simple_poll_quit(simple_poll);
1044
1535
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1536
if(not add_server(ip, (in_port_t)port, interface,
1537
avahi_proto_to_af(proto),
1538
&((mandos_context*)mc)->current_server)){
1047
1539
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
1540
" list\n", name);
1049
1541
}
1062
1554
const char *domain,
1063
1555
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1064
1556
flags,
1065
AVAHI_GCC_UNUSED void* userdata){
1066
assert(b);
1557
void *mc){
1558
if(b == NULL){
1559
return;
1560
}
1067
1561
1068
1562
/* Called whenever a new services becomes available on the LAN or
1069
1563
is removed from the LAN */
1077
1571
case AVAHI_BROWSER_FAILURE:
1078
1572
1079
1573
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1574
avahi_strerror(avahi_server_errno
1575
(((mandos_context*)mc)->server)));
1576
avahi_simple_poll_quit(simple_poll);
1082
1577
return;
1083
1578
1084
1579
case AVAHI_BROWSER_NEW:
1087
1582
the callback function is called the Avahi server will free the
1088
1583
resolver for us. */
1089
1584
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1585
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1586
interface, protocol, name, type,
1587
domain, protocol, 0,
1588
resolve_callback, mc) == NULL)
1093
1589
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
1590
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1591
avahi_strerror(avahi_server_errno
1592
(((mandos_context*)mc)->server)));
1096
1593
break;
1097
1594
1098
1595
case AVAHI_BROWSER_REMOVE:
1117
1614
signal_received = sig;
1118
1615
int old_errno = errno;
1119
1616
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1122
1619
}
1123
1620
errno = old_errno;
1124
1621
}
1125
1622
1623
__attribute__((nonnull, warn_unused_result))
1126
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
1625
int ret;
1128
error_t ret_errno;
1626
int old_errno;
1129
1627
1130
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
1629
if(s < 0){
1132
ret_errno = errno;
1630
old_errno = errno;
1133
1631
perror_plus("socket");
1134
errno = ret_errno;
1632
errno = old_errno;
1135
1633
return false;
1136
1634
}
1137
strcpy(ifr->ifr_name, ifname);
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1138
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
1638
if(ret == -1){
1140
1639
if(debug){
1141
ret_errno = errno;
1640
old_errno = errno;
1142
1641
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1642
errno = old_errno;
1144
1643
}
1145
1644
return false;
1146
1645
}
1147
1646
return true;
1148
1647
}
1149
1648
1649
__attribute__((nonnull, warn_unused_result))
1150
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1651
1152
1652
/* Reject the loopback device */
1194
1694
* corresponds to an acceptable network device.
1195
1695
* (This function is passed to scandir(3) as a filter function.)
1196
1696
*/
1697
__attribute__((nonnull, warn_unused_result))
1197
1698
int good_interface(const struct dirent *if_entry){
1198
1699
if(if_entry->d_name[0] == '.'){
1199
1700
return 0;
1217
1718
/*
1218
1719
* This function determines if a network interface is up.
1219
1720
*/
1721
__attribute__((nonnull, warn_unused_result))
1220
1722
bool interface_is_up(const char *interface){
1221
1723
struct ifreq ifr;
1222
1724
if(not get_flags(interface, &ifr)){
1233
1735
/*
1234
1736
* This function determines if a network interface is running
1235
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1236
1739
bool interface_is_running(const char *interface){
1237
1740
struct ifreq ifr;
1238
1741
if(not get_flags(interface, &ifr)){
1246
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1750
}
1248
1751
1752
__attribute__((nonnull, pure, warn_unused_result))
1249
1753
int notdotentries(const struct dirent *direntry){
1250
1754
/* Skip "." and ".." */
1251
1755
if(direntry->d_name[0] == '.'
1258
1762
}
1259
1763
1260
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1261
1766
int runnable_hook(const struct dirent *direntry){
1262
1767
int ret;
1263
1768
size_t sret;
1271
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1777
"abcdefghijklmnopqrstuvwxyz"
1273
1778
"0123456789"
1274
"_-");
1779
"_.-");
1275
1780
if((direntry->d_name)[sret] != '\0'){
1276
1781
/* Contains non-allowed characters */
1277
1782
if(debug){
1281
1786
return 0;
1282
1787
}
1283
1788
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1790
if(ret == -1){
1293
1791
if(debug){
1294
1792
perror_plus("Could not stat hook");
1318
1816
return 1;
1319
1817
}
1320
1818
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1322
1822
int ret;
1323
1823
struct timespec now;
1324
1824
struct timespec waited_time;
1325
1825
intmax_t block_time;
1326
1826
1327
1827
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1828
if(mc->current_server == NULL){
1829
if(debug){
1330
1830
fprintf_plus(stderr, "Wait until first server is found."
1331
1831
" No timeout!\n");
1332
1832
}
1333
1833
ret = avahi_simple_poll_iterate(s, -1);
1334
1834
} else {
1335
if (debug){
1835
if(debug){
1336
1836
fprintf_plus(stderr, "Check current_server if we should run"
1337
1837
" it, or wait\n");
1338
1838
}
1345
1845
/* Calculating in ms how long time between now and server
1346
1846
who we visted longest time ago. Now - last seen. */
1347
1847
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1848
- mc->current_server->last_seen.tv_sec);
1349
1849
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1850
- mc->current_server->last_seen.tv_nsec);
1351
1851
/* total time is 10s/10,000ms.
1352
1852
Converting to s from ms by dividing by 1,000,
1353
1853
and ns to ms by dividing by 1,000,000. */
1355
1855
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1856
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1857
1358
if (debug){
1858
if(debug){
1359
1859
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1860
block_time);
1361
1861
}
1362
1862
1363
1863
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1864
ret = start_mandos_communication(mc->current_server->ip,
1865
mc->current_server->port,
1866
mc->current_server->if_index,
1867
mc->current_server->af, mc);
1368
1868
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1869
avahi_simple_poll_quit(s);
1370
1870
return 0;
1371
1871
}
1372
1872
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1873
&mc->current_server->last_seen);
1374
1874
if(ret == -1){
1375
1875
perror_plus("clock_gettime");
1376
1876
return -1;
1377
1877
}
1378
mc.current_server = mc.current_server->next;
1878
mc->current_server = mc->current_server->next;
1379
1879
block_time = 0; /* Call avahi to find new Mandos
1380
1880
servers, but don't block */
1381
1881
}
1383
1883
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1884
}
1385
1885
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1886
if(ret > 0 or errno != EINTR){
1387
1887
return (ret != 1) ? ret : 0;
1388
1888
}
1389
1889
}
1390
1890
}
1391
1891
}
1392
1892
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1446
1895
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1452
1914
if(numhooks == -1){
1453
1915
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1916
return;
1917
}
1918
struct dirent *direntry;
1919
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
direntry->d_name);
1930
}
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
if(ret == -1){
1461
1977
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1520
1982
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
continue;
1532
2051
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
close(devnull);
1569
2071
}
1570
2072
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
2073
__attribute__((nonnull, warn_unused_result))
2074
int bring_up_interface(const char *const interface,
2075
const float delay){
2076
int old_errno = errno;
2077
int ret;
1577
2078
struct ifreq network;
1578
2079
unsigned int if_index = if_nametoindex(interface);
1579
2080
if(if_index == 0){
1588
2089
}
1589
2090
1590
2091
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
2092
int ret_errno = 0;
2093
int ioctl_errno = 0;
2094
if(not get_flags(interface, &network)){
1592
2095
ret_errno = errno;
1593
2096
fprintf_plus(stderr, "Failed to get flags for interface "
1594
2097
"\"%s\"\n", interface);
2098
errno = old_errno;
1595
2099
return ret_errno;
1596
2100
}
1597
network.ifr_flags |= IFF_UP;
2101
network.ifr_flags |= IFF_UP; /* set flag */
1598
2102
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
2103
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2104
if(sd == -1){
1601
2105
ret_errno = errno;
1602
2106
perror_plus("socket");
1603
2107
errno = old_errno;
1604
2108
return ret_errno;
1605
2109
}
1606
2110
1607
2111
if(quit_now){
1608
close(sd);
2112
ret = close(sd);
2113
if(ret == -1){
2114
perror_plus("close");
2115
}
1609
2116
errno = old_errno;
1610
2117
return EINTR;
1611
2118
}
1615
2122
interface);
1616
2123
}
1617
2124
1618
/* Raise priviliges */
1619
raise_privileges();
2125
/* Raise privileges */
2126
ret_errno = raise_privileges();
2127
if(ret_errno != 0){
2128
errno = ret_errno;
2129
perror_plus("Failed to raise privileges");
2130
}
1620
2131
1621
2132
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
2133
int ret_linux;
2134
bool restore_loglevel = false;
2135
if(ret_errno == 0){
2136
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2137
messages about the network interface to mess up the prompt */
2138
ret_linux = klogctl(8, NULL, 5);
2139
if(ret_linux == -1){
2140
perror_plus("klogctl");
2141
} else {
2142
restore_loglevel = true;
2143
}
1629
2144
}
1630
2145
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
2146
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2147
ioctl_errno = errno;
1633
2148
#ifdef __linux__
1634
2149
if(restore_loglevel){
1635
2150
ret_linux = klogctl(7, NULL, 0);
1639
2154
}
1640
2155
#endif /* __linux__ */
1641
2156
1642
/* Lower privileges */
1643
lower_privileges();
2157
/* If raise_privileges() succeeded above */
2158
if(ret_errno == 0){
2159
/* Lower privileges */
2160
ret_errno = lower_privileges();
2161
if(ret_errno != 0){
2162
errno = ret_errno;
2163
perror_plus("Failed to lower privileges");
2164
}
2165
}
1644
2166
1645
2167
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2168
ret = close(sd);
1647
2169
if(ret == -1){
1648
2170
perror_plus("close");
1649
2171
}
1650
2172
1651
2173
if(ret_setflags == -1){
1652
errno = ret_errno;
2174
errno = ioctl_errno;
1653
2175
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
2176
errno = old_errno;
1655
return ret_errno;
2177
return ioctl_errno;
1656
2178
}
1657
2179
} else if(debug){
1658
2180
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1676
2198
return 0;
1677
2199
}
1678
2200
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
2201
__attribute__((nonnull, warn_unused_result))
2202
int take_down_interface(const char *const interface){
2203
int old_errno = errno;
1684
2204
struct ifreq network;
1685
2205
unsigned int if_index = if_nametoindex(interface);
1686
2206
if(if_index == 0){
1689
2209
return ENXIO;
1690
2210
}
1691
2211
if(interface_is_up(interface)){
2212
int ret_errno = 0;
2213
int ioctl_errno = 0;
1692
2214
if(not get_flags(interface, &network) and debug){
1693
2215
ret_errno = errno;
1694
2216
fprintf_plus(stderr, "Failed to get flags for interface "
1695
2217
"\"%s\"\n", interface);
2218
errno = old_errno;
1696
2219
return ret_errno;
1697
2220
}
1698
2221
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
2222
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
2223
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2224
if(sd == -1){
1702
2225
ret_errno = errno;
1703
2226
perror_plus("socket");
1704
2227
errno = old_errno;
1710
2233
interface);
1711
2234
}
1712
2235
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
2236
/* Raise privileges */
2237
ret_errno = raise_privileges();
2238
if(ret_errno != 0){
2239
errno = ret_errno;
2240
perror_plus("Failed to raise privileges");
2241
}
2242
2243
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2244
ioctl_errno = errno;
2245
2246
/* If raise_privileges() succeeded above */
2247
if(ret_errno == 0){
2248
/* Lower privileges */
2249
ret_errno = lower_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to lower privileges");
2253
}
2254
}
1721
2255
1722
2256
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
int ret = close(sd);
1724
2258
if(ret == -1){
1725
2259
perror_plus("close");
1726
2260
}
1727
2261
1728
2262
if(ret_setflags == -1){
1729
errno = ret_errno;
2263
errno = ioctl_errno;
1730
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
2265
errno = old_errno;
1732
return ret_errno;
2266
return ioctl_errno;
1733
2267
}
1734
2268
} else if(debug){
1735
2269
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
2275
}
1742
2276
1743
2277
int main(int argc, char *argv[]){
2278
mandos_context mc = { .server = NULL, .dh_bits = 0,
2279
.priority = "SECURE256:!CTYPE-X.509"
2280
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2281
.current_server = NULL, .interfaces = NULL,
2282
.interfaces_size = 0 };
1744
2283
AvahiSServiceBrowser *sb = NULL;
1745
2284
error_t ret_errno;
1746
2285
int ret;
1747
2286
intmax_t tmpmax;
1748
2287
char *tmp;
1749
2288
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
2289
char *interfaces_to_take_down = NULL;
1753
2290
size_t interfaces_to_take_down_size = 0;
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1755
bool tempdir_created = false;
2291
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2292
char old_tempdir[] = "/tmp/mandosXXXXXX";
2293
char *tempdir = NULL;
1756
2294
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
2295
const char *seckey = PATHDIR "/" SECKEY;
1758
2296
const char *pubkey = PATHDIR "/" PUBKEY;
2297
const char *dh_params_file = NULL;
1759
2298
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
2299
1762
2300
bool gnutls_initialized = false;
1763
2301
bool gpgme_initialized = false;
1815
2353
.doc = "Bit length of the prime number used in the"
1816
2354
" Diffie-Hellman key exchange",
1817
2355
.group = 2 },
2356
{ .name = "dh-params", .key = 134,
2357
.arg = "FILE",
2358
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2359
" for the Diffie-Hellman key exchange",
2360
.group = 2 },
1818
2361
{ .name = "priority", .key = 130,
1819
2362
.arg = "STRING",
1820
2363
.doc = "GnuTLS priority string for the TLS handshake",
1854
2397
connect_to = arg;
1855
2398
break;
1856
2399
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
2400
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2401
arg, (int)',');
1859
2402
if(ret_errno != 0){
1860
2403
argp_error(state, "%s", strerror(ret_errno));
1861
2404
}
1875
2418
}
1876
2419
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1877
2420
break;
2421
case 134: /* --dh-params */
2422
dh_params_file = arg;
2423
break;
1878
2424
case 130: /* --priority */
1879
2425
mc.priority = arg;
1880
2426
break;
1920
2466
.args_doc = "",
1921
2467
.doc = "Mandos client -- Get and decrypt"
1922
2468
" passwords from a Mandos server" };
1923
ret = argp_parse(&argp, argc, argv,
1924
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1925
switch(ret){
2469
ret_errno = argp_parse(&argp, argc, argv,
2470
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2471
switch(ret_errno){
1926
2472
case 0:
1927
2473
break;
1928
2474
case ENOMEM:
1929
2475
default:
1930
errno = ret;
2476
errno = ret_errno;
1931
2477
perror_plus("argp_parse");
1932
2478
exitcode = EX_OSERR;
1933
2479
goto end;
1936
2482
goto end;
1937
2483
}
1938
2484
}
1939
2485
1940
2486
{
1941
2487
/* Work around Debian bug #633582:
1942
2488
<http://bugs.debian.org/633582> */
1943
2489
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
2490
/* Re-raise privileges */
2491
ret = raise_privileges();
2492
if(ret != 0){
2493
errno = ret;
2494
perror_plus("Failed to raise privileges");
2495
} else {
1946
2496
struct stat st;
1947
2497
1948
2498
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1962
2512
}
1963
2513
}
1964
2514
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
2515
close(seckey_fd);
1966
2516
}
1967
2517
}
1968
2518
1969
2519
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
2520
int pubkey_fd = open(pubkey, O_RDONLY);
1971
2521
if(pubkey_fd == -1){
1983
2533
}
1984
2534
}
1985
2535
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
2536
close(pubkey_fd);
2537
}
2538
}
2539
2540
if(dh_params_file != NULL
2541
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2542
int dhparams_fd = open(dh_params_file, O_RDONLY);
2543
if(dhparams_fd == -1){
2544
perror_plus("open");
2545
} else {
2546
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2547
if(ret == -1){
2548
perror_plus("fstat");
2549
} else {
2550
if(S_ISREG(st.st_mode)
2551
and st.st_uid == 0 and st.st_gid == 0){
2552
ret = fchown(dhparams_fd, uid, gid);
2553
if(ret == -1){
2554
perror_plus("fchown");
2555
}
2556
}
2557
}
2558
close(dhparams_fd);
2559
}
2560
}
2561
1990
2562
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
2563
ret = lower_privileges();
2564
if(ret != 0){
2565
errno = ret;
2566
perror_plus("Failed to lower privileges");
1995
2567
}
1996
2568
}
1997
2569
}
1998
2570
1999
/* Remove empty interface names */
2571
/* Remove invalid interface names (except "none") */
2000
2572
{
2001
2573
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2574
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2003
2575
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2576
if(strcmp(interface, "none") != 0
2577
and if_nametoindex(interface) == 0){
2578
if(interface[0] != '\0'){
2006
2579
fprintf_plus(stderr, "Not using nonexisting interface"
2007
2580
" \"%s\"\n", interface);
2008
2581
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2582
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2010
2583
interface = NULL;
2011
2584
}
2012
2585
}
2014
2587
2015
2588
/* Run network hooks */
2016
2589
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2590
if(mc.interfaces != NULL){
2591
interfaces_hooks = malloc(mc.interfaces_size);
2592
if(interfaces_hooks == NULL){
2593
perror_plus("malloc");
2594
goto end;
2595
}
2596
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2597
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2598
}
2599
run_network_hooks("start", interfaces_hooks != NULL ?
2600
interfaces_hooks : "", delay);
2028
2601
}
2029
2602
2030
2603
if(not debug){
2035
2608
from the signal handler */
2036
2609
/* Initialize the pseudo-RNG for Avahi */
2037
2610
srand((unsigned int) time(NULL));
2038
mc.simple_poll = avahi_simple_poll_new();
2039
if(mc.simple_poll == NULL){
2611
simple_poll = avahi_simple_poll_new();
2612
if(simple_poll == NULL){
2040
2613
fprintf_plus(stderr,
2041
2614
"Avahi: Failed to create simple poll object.\n");
2042
2615
exitcode = EX_UNAVAILABLE;
2107
2680
}
2108
2681
2109
2682
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2683
if(mc.interfaces == NULL){
2684
struct dirent **direntries = NULL;
2112
2685
/* Look for any good interfaces */
2113
2686
ret = scandir(sys_class_net, &direntries, good_interface,
2114
2687
alphasort);
2115
2688
if(ret >= 1){
2116
2689
/* Add all found interfaces to interfaces list */
2117
2690
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2691
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2119
2692
direntries[i]->d_name);
2120
2693
if(ret_errno != 0){
2694
errno = ret_errno;
2121
2695
perror_plus("argz_add");
2696
free(direntries[i]);
2122
2697
continue;
2123
2698
}
2124
2699
if(debug){
2125
2700
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
2701
direntries[i]->d_name);
2127
2702
}
2703
free(direntries[i]);
2128
2704
}
2129
2705
free(direntries);
2130
2706
} else {
2131
free(direntries);
2707
if(ret == 0){
2708
free(direntries);
2709
}
2132
2710
fprintf_plus(stderr, "Could not find a network interface\n");
2133
2711
exitcode = EXIT_FAILURE;
2134
2712
goto end;
2135
2713
}
2136
2714
}
2137
2715
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2716
/* Bring up interfaces which are down, and remove any "none"s */
2717
{
2150
2718
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2719
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2152
2720
interface))){
2721
/* If interface name is "none", stop bringing up interfaces.
2722
Also remove all instances of "none" from the list */
2723
if(strcmp(interface, "none") == 0){
2724
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
interface);
2726
interface = NULL;
2727
while((interface = argz_next(mc.interfaces,
2728
mc.interfaces_size, interface))){
2729
if(strcmp(interface, "none") == 0){
2730
argz_delete(&mc.interfaces, &mc.interfaces_size,
2731
interface);
2732
interface = NULL;
2733
}
2734
}
2735
break;
2736
}
2153
2737
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2738
errno = bring_up_interface(interface, delay);
2155
2739
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2740
if(errno != 0){
2741
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2742
" %s\n", interface, strerror(errno));
2159
2743
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2744
errno = argz_add(&interfaces_to_take_down,
2745
&interfaces_to_take_down_size,
2746
interface);
2747
if(errno != 0){
2748
perror_plus("argz_add");
2749
}
2163
2750
}
2164
2751
}
2165
2752
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
2753
if(debug and (interfaces_to_take_down == NULL)){
2170
2754
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
2755
}
2172
2756
}
2173
2757
2758
/* If we only got one interface, explicitly use only that one */
2759
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2760
if(debug){
2761
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2762
mc.interfaces);
2763
}
2764
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2765
}
2766
2174
2767
if(quit_now){
2175
2768
goto end;
2176
2769
}
2177
2770
2178
ret = init_gnutls_global(pubkey, seckey);
2771
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2179
2772
if(ret == -1){
2180
2773
fprintf_plus(stderr, "init_gnutls_global failed\n");
2181
2774
exitcode = EX_UNAVAILABLE;
2188
2781
goto end;
2189
2782
}
2190
2783
2191
if(mkdtemp(tempdir) == NULL){
2784
/* Try /run/tmp before /tmp */
2785
tempdir = mkdtemp(run_tempdir);
2786
if(tempdir == NULL and errno == ENOENT){
2787
if(debug){
2788
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2789
run_tempdir, old_tempdir);
2790
}
2791
tempdir = mkdtemp(old_tempdir);
2792
}
2793
if(tempdir == NULL){
2192
2794
perror_plus("mkdtemp");
2193
2795
goto end;
2194
2796
}
2195
tempdir_created = true;
2196
2797
2197
2798
if(quit_now){
2198
2799
goto end;
2199
2800
}
2200
2801
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2802
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2202
2803
fprintf_plus(stderr, "init_gpgme failed\n");
2203
2804
exitcode = EX_UNAVAILABLE;
2204
2805
goto end;
2225
2826
goto end;
2226
2827
}
2227
2828
2228
uint16_t port;
2829
in_port_t port;
2229
2830
errno = 0;
2230
2831
tmpmax = strtoimax(address+1, &tmp, 10);
2231
2832
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
or tmpmax != (uint16_t)tmpmax){
2833
or tmpmax != (in_port_t)tmpmax){
2233
2834
fprintf_plus(stderr, "Bad port number\n");
2234
2835
exitcode = EX_USAGE;
2235
2836
goto end;
2236
2837
}
2237
2838
2238
2839
if(quit_now){
2239
2840
goto end;
2240
2841
}
2241
2842
2242
port = (uint16_t)tmpmax;
2843
port = (in_port_t)tmpmax;
2243
2844
*address = '\0';
2244
2845
/* Colon in address indicates IPv6 */
2245
2846
int af;
2261
2862
}
2262
2863
2263
2864
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2865
ret = start_mandos_communication(address, port, if_index, af,
2866
&mc);
2265
2867
if(quit_now or ret == 0){
2266
2868
break;
2267
2869
}
2269
2871
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
2872
(int)retry_interval);
2271
2873
}
2272
sleep((int)retry_interval);
2874
sleep((unsigned int)retry_interval);
2273
2875
}
2274
2876
2275
if (not quit_now){
2877
if(not quit_now){
2276
2878
exitcode = EXIT_SUCCESS;
2277
2879
}
2278
2880
2293
2895
config.publish_domain = 0;
2294
2896
2295
2897
/* Allocate a new server */
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2297
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
2898
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2899
&config, NULL, NULL, &ret);
2299
2900
2300
2901
/* Free the Avahi configuration data */
2301
2902
avahi_server_config_free(&config);
2304
2905
/* Check if creating the Avahi server object succeeded */
2305
2906
if(mc.server == NULL){
2306
2907
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
2908
avahi_strerror(ret));
2308
2909
exitcode = EX_UNAVAILABLE;
2309
2910
goto end;
2310
2911
}
2316
2917
/* Create the Avahi service browser */
2317
2918
sb = avahi_s_service_browser_new(mc.server, if_index,
2318
2919
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
NULL, 0, browse_callback, NULL);
2920
NULL, 0, browse_callback,
2921
(void *)&mc);
2320
2922
if(sb == NULL){
2321
2923
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
2924
avahi_strerror(avahi_server_errno(mc.server)));
2333
2935
if(debug){
2334
2936
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
2937
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2938
2939
ret = avahi_loop_with_timeout(simple_poll,
2940
(int)(retry_interval * 1000), &mc);
2339
2941
if(debug){
2340
2942
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
2943
(ret == 0) ? "successfully" : "with error");
2348
2950
}
2349
2951
2350
2952
/* Cleanup things */
2953
free(mc.interfaces);
2954
2351
2955
if(sb != NULL)
2352
2956
avahi_s_service_browser_free(sb);
2353
2957
2354
2958
if(mc.server != NULL)
2355
2959
avahi_server_free(mc.server);
2356
2960
2357
if(mc.simple_poll != NULL)
2358
avahi_simple_poll_free(mc.simple_poll);
2961
if(simple_poll != NULL)
2962
avahi_simple_poll_free(simple_poll);
2359
2963
2360
2964
if(gnutls_initialized){
2361
2965
gnutls_certificate_free_credentials(mc.cred);
2362
gnutls_global_deinit();
2363
2966
gnutls_dh_params_deinit(mc.dh_params);
2364
2967
}
2365
2968
2373
2976
mc.current_server->prev->next = NULL;
2374
2977
while(mc.current_server != NULL){
2375
2978
server *next = mc.current_server->next;
2979
#ifdef __GNUC__
2980
#pragma GCC diagnostic push
2981
#pragma GCC diagnostic ignored "-Wcast-qual"
2982
#endif
2983
free((char *)(mc.current_server->ip));
2984
#ifdef __GNUC__
2985
#pragma GCC diagnostic pop
2986
#endif
2376
2987
free(mc.current_server);
2377
2988
mc.current_server = next;
2378
2989
}
2379
2990
}
2380
2991
2381
/* Re-raise priviliges */
2992
/* Re-raise privileges */
2382
2993
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2398
}
2399
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2403
}
2404
}
2405
2406
lower_privileges_permanently();
2994
ret = raise_privileges();
2995
if(ret != 0){
2996
errno = ret;
2997
perror_plus("Failed to raise privileges");
2998
} else {
2999
3000
/* Run network hooks */
3001
run_network_hooks("stop", interfaces_hooks != NULL ?
3002
interfaces_hooks : "", delay);
3003
3004
/* Take down the network interfaces which were brought up */
3005
{
3006
char *interface = NULL;
3007
while((interface=argz_next(interfaces_to_take_down,
3008
interfaces_to_take_down_size,
3009
interface))){
3010
ret = take_down_interface(interface);
3011
if(ret != 0){
3012
errno = ret;
3013
perror_plus("Failed to take down interface");
3014
}
3015
}
3016
if(debug and (interfaces_to_take_down == NULL)){
3017
fprintf_plus(stderr, "No interfaces needed to be taken"
3018
" down\n");
3019
}
3020
}
3021
}
3022
3023
ret = lower_privileges_permanently();
3024
if(ret != 0){
3025
errno = ret;
3026
perror_plus("Failed to lower privileges permanently");
3027
}
2407
3028
}
2408
3029
2409
3030
free(interfaces_to_take_down);
2410
3031
free(interfaces_hooks);
2411
3032
3033
void clean_dir_at(int base, const char * const dirname,
3034
uintmax_t level){
3035
struct dirent **direntries = NULL;
3036
int dret;
3037
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3038
O_RDONLY
3039
| O_NOFOLLOW
3040
| O_DIRECTORY
3041
| O_PATH));
3042
if(dir_fd == -1){
3043
perror_plus("open");
3044
}
3045
int numentries = scandirat(dir_fd, ".", &direntries,
3046
notdotentries, alphasort);
3047
if(numentries >= 0){
3048
for(int i = 0; i < numentries; i++){
3049
if(debug){
3050
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3051
dirname, direntries[i]->d_name);
3052
}
3053
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3054
if(dret == -1){
3055
if(errno == EISDIR){
3056
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
AT_REMOVEDIR);
3058
}
3059
if((dret == -1) and (errno == ENOTEMPTY)
3060
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3061
== 0) and (level == 0)){
3062
/* Recurse only in this special case */
3063
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
dret = 0;
3065
}
3066
if(dret == -1){
3067
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
direntries[i]->d_name, strerror(errno));
3069
}
3070
}
3071
free(direntries[i]);
3072
}
3073
3074
/* need to clean even if 0 because man page doesn't specify */
3075
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
if(dret == -1 and errno != ENOENT){
3081
perror_plus("rmdir");
3082
}
3083
} else {
3084
perror_plus("scandirat");
3085
}
3086
close(dir_fd);
3087
}
3088
2412
3089
/* Removes the GPGME temp directory and all files inside */
2413
if(tempdir_created){
2414
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
direntry = direntries[i];
2421
char *fullname = NULL;
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
direntry->d_name);
2424
if(ret < 0){
2425
perror_plus("asprintf");
2426
continue;
2427
}
2428
ret = remove(fullname);
2429
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
2432
}
2433
free(fullname);
2434
}
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
2441
}
2442
ret = rmdir(tempdir);
2443
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
2445
}
3090
if(tempdir != NULL){
3091
clean_dir_at(-1, tempdir, 0);
2446
3092
}
2447
3093
2448
3094
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0