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- Committer: Teddy Hogeborn
- Date: 2014-03-10 10:11:37 UTC
- Revision ID: teddy@recompile.se-20140310101137-3khoc3qrntp13l08
White space fix: change "if (" to "if(" in C code.
* plugins.d/mandos-client.c (start_mandos_communication): White space
fix.
(avahi_loop_with_timeout, main): - '' -
* plugins.d/mandos-client.c (start_mandos_communication): White space
fix.
(avahi_loop_with_timeout, main): - '' -
- files added:
- debian/upstream-signing-key.pgp
- files removed:
- bugs.xml
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
76
setgid(), pause(), _exit() */
84
77
#include <arpa/inet.h> /* inet_pton(), htons() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
148
141
static const char sys_class_net[] = "/sys/class/net";
149
142
char *connect_to = NULL;
150
143
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
144
uid_t uid = 65534;
153
145
gid_t gid = 65534;
154
146
191
183
perror(print_text);
192
184
}
193
185
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
__attribute__((format (gnu_printf, 2, 3)))
195
187
int fprintf_plus(FILE *stream, const char *format, ...){
196
188
va_list ap;
197
189
va_start (ap, format);
206
198
* bytes. "buffer_capacity" is how much is currently allocated,
207
199
* "buffer_length" is how much is already used.
208
200
*/
209
__attribute__((nonnull, warn_unused_result))
210
201
size_t incbuffer(char **buffer, size_t buffer_length,
211
202
size_t buffer_capacity){
212
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
225
216
}
226
217
227
218
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
220
int af, server **current_server){
231
221
int ret;
240
230
.af = af };
241
231
if(new_server->ip == NULL){
242
232
perror_plus("strdup");
243
free(new_server);
244
233
return false;
245
234
}
246
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
236
if(ret == -1){
248
237
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
238
return false;
259
239
}
260
240
/* Special case of first server */
262
242
new_server->next = new_server;
263
243
new_server->prev = new_server;
264
244
*current_server = new_server;
245
/* Place the new server last in the list */
265
246
} else {
266
/* Place the new server last in the list */
267
247
new_server->next = *current_server;
268
248
new_server->prev = (*current_server)->prev;
269
249
new_server->prev->next = new_server;
272
252
return true;
273
253
}
274
254
275
/* Set effective uid to 0, return errno */
276
__attribute__((warn_unused_result))
277
int raise_privileges(void){
278
int old_errno = errno;
279
int ret = 0;
280
if(seteuid(0) == -1){
281
ret = errno;
282
}
283
errno = old_errno;
284
return ret;
285
}
286
287
/* Set effective and real user ID to 0. Return errno. */
288
__attribute__((warn_unused_result))
289
int raise_privileges_permanently(void){
290
int old_errno = errno;
291
int ret = raise_privileges();
292
if(ret != 0){
293
errno = old_errno;
294
return ret;
295
}
296
if(setuid(0) == -1){
297
ret = errno;
298
}
299
errno = old_errno;
300
return ret;
301
}
302
303
/* Set effective user ID to unprivileged saved user ID */
304
__attribute__((warn_unused_result))
305
int lower_privileges(void){
306
int old_errno = errno;
307
int ret = 0;
308
if(seteuid(uid) == -1){
309
ret = errno;
310
}
311
errno = old_errno;
312
return ret;
313
}
314
315
/* Lower privileges permanently */
316
__attribute__((warn_unused_result))
317
int lower_privileges_permanently(void){
318
int old_errno = errno;
319
int ret = 0;
320
if(setuid(uid) == -1){
321
ret = errno;
322
}
323
errno = old_errno;
324
return ret;
325
}
326
327
255
/*
328
256
* Initialize GPGME.
329
257
*/
330
__attribute__((nonnull, warn_unused_result))
331
static bool init_gpgme(const char * const seckey,
332
const char * const pubkey,
333
const char * const tempdir,
334
mandos_context *mc){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
335
260
gpgme_error_t rc;
336
261
gpgme_engine_info_t engine_info;
337
262
338
263
/*
339
264
* Helper function to insert pub and seckey to the engine keyring.
340
265
*/
341
bool import_key(const char * const filename){
266
bool import_key(const char *filename){
342
267
int ret;
343
268
int fd;
344
269
gpgme_data_t pgp_data;
349
274
return false;
350
275
}
351
276
352
/* Workaround for systems without a real-time clock; see also
353
Debian bug #894495: <https://bugs.debian.org/894495> */
354
do {
355
{
356
time_t currtime = time(NULL);
357
if(currtime != (time_t)-1){
358
struct tm tm;
359
if(gmtime_r(&currtime, &tm) == NULL) {
360
perror_plus("gmtime_r");
361
break;
362
}
363
if(tm.tm_year != 70 or tm.tm_mon != 0){
364
break;
365
}
366
if(debug){
367
fprintf_plus(stderr, "System clock is January 1970");
368
}
369
} else {
370
if(debug){
371
fprintf_plus(stderr, "System clock is invalid");
372
}
373
}
374
}
375
struct stat keystat;
376
ret = fstat(fd, &keystat);
377
if(ret != 0){
378
perror_plus("fstat");
379
break;
380
}
381
ret = raise_privileges();
382
if(ret != 0){
383
errno = ret;
384
perror_plus("Failed to raise privileges");
385
break;
386
}
387
if(debug){
388
fprintf_plus(stderr,
389
"Setting system clock to key file mtime");
390
}
391
time_t keytime = keystat.st_mtim.tv_sec;
392
if(stime(&keytime) != 0){
393
perror_plus("stime");
394
}
395
ret = lower_privileges();
396
if(ret != 0){
397
errno = ret;
398
perror_plus("Failed to lower privileges");
399
}
400
} while(false);
401
402
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
403
278
if(rc != GPG_ERR_NO_ERROR){
404
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
412
287
gpgme_strsource(rc), gpgme_strerror(rc));
413
288
return false;
414
289
}
415
{
416
gpgme_import_result_t import_result
417
= gpgme_op_import_result(mc->ctx);
418
if((import_result->imported < 1
419
or import_result->not_imported > 0)
420
and import_result->unchanged == 0){
421
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
422
fprintf_plus(stderr,
423
"The total number of considered keys: %d\n",
424
import_result->considered);
425
fprintf_plus(stderr,
426
"The number of keys without user ID: %d\n",
427
import_result->no_user_id);
428
fprintf_plus(stderr,
429
"The total number of imported keys: %d\n",
430
import_result->imported);
431
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
432
import_result->imported_rsa);
433
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
434
import_result->unchanged);
435
fprintf_plus(stderr, "The number of new user IDs: %d\n",
436
import_result->new_user_ids);
437
fprintf_plus(stderr, "The number of new sub keys: %d\n",
438
import_result->new_sub_keys);
439
fprintf_plus(stderr, "The number of new signatures: %d\n",
440
import_result->new_signatures);
441
fprintf_plus(stderr, "The number of new revocations: %d\n",
442
import_result->new_revocations);
443
fprintf_plus(stderr,
444
"The total number of secret keys read: %d\n",
445
import_result->secret_read);
446
fprintf_plus(stderr,
447
"The number of imported secret keys: %d\n",
448
import_result->secret_imported);
449
fprintf_plus(stderr,
450
"The number of unchanged secret keys: %d\n",
451
import_result->secret_unchanged);
452
fprintf_plus(stderr, "The number of keys not imported: %d\n",
453
import_result->not_imported);
454
for(gpgme_import_status_t import_status
455
= import_result->imports;
456
import_status != NULL;
457
import_status = import_status->next){
458
fprintf_plus(stderr, "Import status for key: %s\n",
459
import_status->fpr);
460
if(import_status->result != GPG_ERR_NO_ERROR){
461
fprintf_plus(stderr, "Import result: %s: %s\n",
462
gpgme_strsource(import_status->result),
463
gpgme_strerror(import_status->result));
464
}
465
fprintf_plus(stderr, "Key status:\n");
466
fprintf_plus(stderr,
467
import_status->status & GPGME_IMPORT_NEW
468
? "The key was new.\n"
469
: "The key was not new.\n");
470
fprintf_plus(stderr,
471
import_status->status & GPGME_IMPORT_UID
472
? "The key contained new user IDs.\n"
473
: "The key did not contain new user IDs.\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_SIG
476
? "The key contained new signatures.\n"
477
: "The key did not contain new signatures.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_SUBKEY
480
? "The key contained new sub keys.\n"
481
: "The key did not contain new sub keys.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SECRET
484
? "The key contained a secret key.\n"
485
: "The key did not contain a secret key.\n");
486
}
487
return false;
488
}
489
}
490
290
491
ret = close(fd);
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
492
292
if(ret == -1){
493
293
perror_plus("close");
494
294
}
533
333
/* Create new GPGME "context" */
534
334
rc = gpgme_new(&(mc->ctx));
535
335
if(rc != GPG_ERR_NO_ERROR){
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
538
339
return false;
539
340
}
540
341
549
350
* Decrypt OpenPGP data.
550
351
* Returns -1 on error
551
352
*/
552
__attribute__((nonnull, warn_unused_result))
553
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
554
354
size_t crypto_size,
555
355
char **plaintext,
576
376
/* Create new empty GPGME data buffer for the plaintext */
577
377
rc = gpgme_data_new(&dh_plain);
578
378
if(rc != GPG_ERR_NO_ERROR){
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
580
381
gpgme_strsource(rc), gpgme_strerror(rc));
581
382
gpgme_data_release(dh_crypto);
582
383
return -1;
595
396
if(result == NULL){
596
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
597
398
} else {
598
if(result->unsupported_algorithm != NULL) {
599
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
600
result->unsupported_algorithm);
601
}
602
fprintf_plus(stderr, "Wrong key usage: %s\n",
603
result->wrong_key_usage ? "Yes" : "No");
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
604
403
if(result->file_name != NULL){
605
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
606
405
}
607
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
609
r = r->next){
406
gpgme_recipient_t recipient;
407
recipient = result->recipients;
408
while(recipient != NULL){
610
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
611
gpgme_pubkey_algo_name(r->pubkey_algo));
612
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
613
413
fprintf_plus(stderr, "Secret key available: %s\n",
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
416
recipient = recipient->next;
615
417
}
616
418
}
617
419
}
673
475
return plaintext_length;
674
476
}
675
477
676
__attribute__((warn_unused_result, const))
677
static const char *safe_string(const char *str){
678
if(str == NULL)
679
return "(unknown)";
680
return str;
681
}
682
683
__attribute__((warn_unused_result))
684
static const char *safer_gnutls_strerror(int value){
478
static const char * safer_gnutls_strerror(int value){
685
479
const char *ret = gnutls_strerror(value);
686
return safe_string(ret);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
687
483
}
688
484
689
485
/* GnuTLS log function callback */
690
__attribute__((nonnull))
691
486
static void debuggnutls(__attribute__((unused)) int level,
692
487
const char* string){
693
488
fprintf_plus(stderr, "GnuTLS: %s", string);
694
489
}
695
490
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
697
491
static int init_gnutls_global(const char *pubkeyfilename,
698
492
const char *seckeyfilename,
699
const char *dhparamsfilename,
700
493
mandos_context *mc){
701
494
int ret;
702
unsigned int uret;
703
495
704
496
if(debug){
705
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
706
498
}
707
499
500
ret = gnutls_global_init();
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
504
return -1;
505
}
506
708
507
if(debug){
709
508
/* "Use a log level over 10 to enable all debugging options."
710
509
* - GnuTLS manual
718
517
if(ret != GNUTLS_E_SUCCESS){
719
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
720
519
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
721
521
return -1;
722
522
}
723
523
748
548
safer_gnutls_strerror(ret));
749
549
goto globalfail;
750
550
}
751
/* If a Diffie-Hellman parameters file was given, try to use it */
752
if(dhparamsfilename != NULL){
753
gnutls_datum_t params = { .data = NULL, .size = 0 };
754
do {
755
int dhpfile = open(dhparamsfilename, O_RDONLY);
756
if(dhpfile == -1){
757
perror_plus("open");
758
dhparamsfilename = NULL;
759
break;
760
}
761
size_t params_capacity = 0;
762
while(true){
763
params_capacity = incbuffer((char **)¶ms.data,
764
(size_t)params.size,
765
(size_t)params_capacity);
766
if(params_capacity == 0){
767
perror_plus("incbuffer");
768
free(params.data);
769
params.data = NULL;
770
dhparamsfilename = NULL;
771
break;
772
}
773
ssize_t bytes_read = read(dhpfile,
774
params.data + params.size,
775
BUFFER_SIZE);
776
/* EOF */
777
if(bytes_read == 0){
778
break;
779
}
780
/* check bytes_read for failure */
781
if(bytes_read < 0){
782
perror_plus("read");
783
free(params.data);
784
params.data = NULL;
785
dhparamsfilename = NULL;
786
break;
787
}
788
params.size += (unsigned int)bytes_read;
789
}
790
ret = close(dhpfile);
791
if(ret == -1){
792
perror_plus("close");
793
}
794
if(params.data == NULL){
795
dhparamsfilename = NULL;
796
}
797
if(dhparamsfilename == NULL){
798
break;
799
}
800
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
801
GNUTLS_X509_FMT_PEM);
802
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Failed to parse DH parameters in file"
804
" \"%s\": %s\n", dhparamsfilename,
805
safer_gnutls_strerror(ret));
806
dhparamsfilename = NULL;
807
}
808
free(params.data);
809
} while(false);
810
}
811
if(dhparamsfilename == NULL){
812
if(mc->dh_bits == 0){
813
/* Find out the optimal number of DH bits */
814
/* Try to read the private key file */
815
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
816
do {
817
int secfile = open(seckeyfilename, O_RDONLY);
818
if(secfile == -1){
819
perror_plus("open");
820
break;
821
}
822
size_t buffer_capacity = 0;
823
while(true){
824
buffer_capacity = incbuffer((char **)&buffer.data,
825
(size_t)buffer.size,
826
(size_t)buffer_capacity);
827
if(buffer_capacity == 0){
828
perror_plus("incbuffer");
829
free(buffer.data);
830
buffer.data = NULL;
831
break;
832
}
833
ssize_t bytes_read = read(secfile,
834
buffer.data + buffer.size,
835
BUFFER_SIZE);
836
/* EOF */
837
if(bytes_read == 0){
838
break;
839
}
840
/* check bytes_read for failure */
841
if(bytes_read < 0){
842
perror_plus("read");
843
free(buffer.data);
844
buffer.data = NULL;
845
break;
846
}
847
buffer.size += (unsigned int)bytes_read;
848
}
849
close(secfile);
850
} while(false);
851
/* If successful, use buffer to parse private key */
852
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
853
if(buffer.data != NULL){
854
{
855
gnutls_openpgp_privkey_t privkey = NULL;
856
ret = gnutls_openpgp_privkey_init(&privkey);
857
if(ret != GNUTLS_E_SUCCESS){
858
fprintf_plus(stderr, "Error initializing OpenPGP key"
859
" structure: %s",
860
safer_gnutls_strerror(ret));
861
free(buffer.data);
862
buffer.data = NULL;
863
} else {
864
ret = gnutls_openpgp_privkey_import
865
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
866
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
868
safer_gnutls_strerror(ret));
869
privkey = NULL;
870
}
871
free(buffer.data);
872
buffer.data = NULL;
873
if(privkey != NULL){
874
/* Use private key to suggest an appropriate
875
sec_param */
876
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
877
gnutls_openpgp_privkey_deinit(privkey);
878
if(debug){
879
fprintf_plus(stderr, "This OpenPGP key implies using"
880
" a GnuTLS security parameter \"%s\".\n",
881
safe_string(gnutls_sec_param_get_name
882
(sec_param)));
883
}
884
}
885
}
886
}
887
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
888
/* Err on the side of caution */
889
sec_param = GNUTLS_SEC_PARAM_ULTRA;
890
if(debug){
891
fprintf_plus(stderr, "Falling back to security parameter"
892
" \"%s\"\n",
893
safe_string(gnutls_sec_param_get_name
894
(sec_param)));
895
}
896
}
897
}
898
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
899
if(uret != 0){
900
mc->dh_bits = uret;
901
if(debug){
902
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
903
" implies %u DH bits; using that.\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)),
906
mc->dh_bits);
907
}
908
} else {
909
fprintf_plus(stderr, "Failed to get implied number of DH"
910
" bits for security parameter \"%s\"): %s\n",
911
safe_string(gnutls_sec_param_get_name
912
(sec_param)),
913
safer_gnutls_strerror(ret));
914
goto globalfail;
915
}
916
} else if(debug){
917
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
918
mc->dh_bits);
919
}
920
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
921
if(ret != GNUTLS_E_SUCCESS){
922
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
923
" bits): %s\n", mc->dh_bits,
924
safer_gnutls_strerror(ret));
925
goto globalfail;
926
}
927
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
555
goto globalfail;
556
}
557
928
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
929
559
930
560
return 0;
932
562
globalfail:
933
563
934
564
gnutls_certificate_free_credentials(mc->cred);
565
gnutls_global_deinit();
935
566
gnutls_dh_params_deinit(mc->dh_params);
936
567
return -1;
937
568
}
938
569
939
__attribute__((nonnull, warn_unused_result))
940
570
static int init_gnutls_session(gnutls_session_t *session,
941
571
mandos_context *mc){
942
572
int ret;
989
619
/* ignore client certificate if any. */
990
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
991
621
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
992
624
return 0;
993
625
}
994
626
996
628
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
997
629
__attribute__((unused)) const char *txt){}
998
630
999
/* Helper function to add_local_route() and delete_local_route() */
1000
__attribute__((nonnull, warn_unused_result))
1001
static bool add_delete_local_route(const bool add,
1002
const char *address,
1003
AvahiIfIndex if_index){
1004
int ret;
1005
char helper[] = "mandos-client-iprouteadddel";
1006
char add_arg[] = "add";
1007
char delete_arg[] = "delete";
1008
char debug_flag[] = "--debug";
1009
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1010
if(pluginhelperdir == NULL){
1011
if(debug){
1012
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1013
" variable not set; cannot run helper\n");
1014
}
1015
return false;
1016
}
1017
1018
char interface[IF_NAMESIZE];
1019
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1020
perror_plus("if_indextoname");
1021
return false;
1022
}
1023
1024
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1025
if(devnull == -1){
1026
perror_plus("open(\"/dev/null\", O_RDONLY)");
1027
return false;
1028
}
1029
pid_t pid = fork();
1030
if(pid == 0){
1031
/* Child */
1032
/* Raise privileges */
1033
errno = raise_privileges_permanently();
1034
if(errno != 0){
1035
perror_plus("Failed to raise privileges");
1036
/* _exit(EX_NOPERM); */
1037
} else {
1038
/* Set group */
1039
errno = 0;
1040
ret = setgid(0);
1041
if(ret == -1){
1042
perror_plus("setgid");
1043
_exit(EX_NOPERM);
1044
}
1045
/* Reset supplementary groups */
1046
errno = 0;
1047
ret = setgroups(0, NULL);
1048
if(ret == -1){
1049
perror_plus("setgroups");
1050
_exit(EX_NOPERM);
1051
}
1052
}
1053
ret = dup2(devnull, STDIN_FILENO);
1054
if(ret == -1){
1055
perror_plus("dup2(devnull, STDIN_FILENO)");
1056
_exit(EX_OSERR);
1057
}
1058
ret = close(devnull);
1059
if(ret == -1){
1060
perror_plus("close");
1061
_exit(EX_OSERR);
1062
}
1063
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1064
if(ret == -1){
1065
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1066
_exit(EX_OSERR);
1067
}
1068
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1069
O_RDONLY
1070
| O_DIRECTORY
1071
| O_PATH
1072
| O_CLOEXEC));
1073
if(helperdir_fd == -1){
1074
perror_plus("open");
1075
_exit(EX_UNAVAILABLE);
1076
}
1077
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1078
helper, O_RDONLY));
1079
if(helper_fd == -1){
1080
perror_plus("openat");
1081
close(helperdir_fd);
1082
_exit(EX_UNAVAILABLE);
1083
}
1084
close(helperdir_fd);
1085
#ifdef __GNUC__
1086
#pragma GCC diagnostic push
1087
#pragma GCC diagnostic ignored "-Wcast-qual"
1088
#endif
1089
if(fexecve(helper_fd, (char *const [])
1090
{ helper, add ? add_arg : delete_arg, (char *)address,
1091
interface, debug ? debug_flag : NULL, NULL },
1092
environ) == -1){
1093
#ifdef __GNUC__
1094
#pragma GCC diagnostic pop
1095
#endif
1096
perror_plus("fexecve");
1097
_exit(EXIT_FAILURE);
1098
}
1099
}
1100
if(pid == -1){
1101
perror_plus("fork");
1102
return false;
1103
}
1104
int status;
1105
pid_t pret = -1;
1106
errno = 0;
1107
do {
1108
pret = waitpid(pid, &status, 0);
1109
if(pret == -1 and errno == EINTR and quit_now){
1110
int errno_raising = 0;
1111
if((errno = raise_privileges()) != 0){
1112
errno_raising = errno;
1113
perror_plus("Failed to raise privileges in order to"
1114
" kill helper program");
1115
}
1116
if(kill(pid, SIGTERM) == -1){
1117
perror_plus("kill");
1118
}
1119
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1120
perror_plus("Failed to lower privileges after killing"
1121
" helper program");
1122
}
1123
return false;
1124
}
1125
} while(pret == -1 and errno == EINTR);
1126
if(pret == -1){
1127
perror_plus("waitpid");
1128
return false;
1129
}
1130
if(WIFEXITED(status)){
1131
if(WEXITSTATUS(status) != 0){
1132
fprintf_plus(stderr, "Error: iprouteadddel exited"
1133
" with status %d\n", WEXITSTATUS(status));
1134
return false;
1135
}
1136
return true;
1137
}
1138
if(WIFSIGNALED(status)){
1139
fprintf_plus(stderr, "Error: iprouteadddel died by"
1140
" signal %d\n", WTERMSIG(status));
1141
return false;
1142
}
1143
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1144
return false;
1145
}
1146
1147
__attribute__((nonnull, warn_unused_result))
1148
static bool add_local_route(const char *address,
1149
AvahiIfIndex if_index){
1150
if(debug){
1151
fprintf_plus(stderr, "Adding route to %s\n", address);
1152
}
1153
return add_delete_local_route(true, address, if_index);
1154
}
1155
1156
__attribute__((nonnull, warn_unused_result))
1157
static bool delete_local_route(const char *address,
1158
AvahiIfIndex if_index){
1159
if(debug){
1160
fprintf_plus(stderr, "Removing route to %s\n", address);
1161
}
1162
return add_delete_local_route(false, address, if_index);
1163
}
1164
1165
631
/* Called when a Mandos server is found */
1166
__attribute__((nonnull, warn_unused_result))
1167
632
static int start_mandos_communication(const char *ip, in_port_t port,
1168
633
AvahiIfIndex if_index,
1169
634
int af, mandos_context *mc){
1178
643
int retval = -1;
1179
644
gnutls_session_t session;
1180
645
int pf; /* Protocol family */
1181
bool route_added = false;
1182
646
1183
647
errno = 0;
1184
648
1206
670
bool match = false;
1207
671
{
1208
672
char *interface = NULL;
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1211
interface))){
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
1212
675
if(if_nametoindex(interface) == (unsigned int)if_index){
1213
676
match = true;
1214
677
break;
1243
706
PRIuMAX "\n", ip, (uintmax_t)port);
1244
707
}
1245
708
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1247
710
if(tcp_sd < 0){
1248
711
int e = errno;
1249
712
perror_plus("socket");
1256
719
goto mandos_end;
1257
720
}
1258
721
722
memset(&to, 0, sizeof(to));
1259
723
if(af == AF_INET6){
1260
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1261
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1262
ret = inet_pton(af, ip, &to6->sin6_addr);
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1263
726
} else { /* IPv4 */
1264
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1265
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1266
ret = inet_pton(af, ip, &to4->sin_addr);
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1267
729
}
1268
730
if(ret < 0 ){
1269
731
int e = errno;
1278
740
goto mandos_end;
1279
741
}
1280
742
if(af == AF_INET6){
1281
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1282
744
if(IN6_IS_ADDR_LINKLOCAL
1283
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1284
746
if(if_index == AVAHI_IF_UNSPEC){
1339
801
goto mandos_end;
1340
802
}
1341
803
1342
while(true){
1343
if(af == AF_INET6){
1344
ret = connect(tcp_sd, (struct sockaddr *)&to,
1345
sizeof(struct sockaddr_in6));
1346
} else {
1347
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1348
sizeof(struct sockaddr_in));
1349
}
1350
if(ret < 0){
1351
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1352
and if_index != AVAHI_IF_UNSPEC
1353
and connect_to == NULL
1354
and not route_added and
1355
((af == AF_INET6 and not
1356
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1357
&to)->sin6_addr)))
1358
or (af == AF_INET and
1359
/* Not a a IPv4LL address */
1360
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1361
& 0xFFFF0000L) != 0xA9FE0000L))){
1362
/* Work around Avahi bug - Avahi does not announce link-local
1363
addresses if it has a global address, so local hosts with
1364
*only* a link-local address (e.g. Mandos clients) cannot
1365
connect to a Mandos server announced by Avahi on a server
1366
host with a global address. Work around this by retrying
1367
with an explicit route added with the server's address.
1368
1369
Avahi bug reference:
1370
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1371
https://bugs.debian.org/587961
1372
*/
1373
if(debug){
1374
fprintf_plus(stderr, "Mandos server unreachable, trying"
1375
" direct route\n");
1376
}
1377
int e = errno;
1378
route_added = add_local_route(ip, if_index);
1379
if(route_added){
1380
continue;
1381
}
1382
errno = e;
1383
}
1384
if(errno != ECONNREFUSED or debug){
1385
int e = errno;
1386
perror_plus("connect");
1387
errno = e;
1388
}
1389
goto mandos_end;
1390
}
1391
1392
if(quit_now){
1393
errno = EINTR;
1394
goto mandos_end;
1395
}
1396
break;
804
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
807
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
810
}
811
if(ret < 0){
812
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
int e = errno;
814
perror_plus("connect");
815
errno = e;
816
}
817
goto mandos_end;
818
}
819
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
1397
823
}
1398
824
1399
825
const char *out = mandos_protocol_version;
1553
979
&decrypted_buffer, mc);
1554
980
if(decrypted_buffer_size >= 0){
1555
981
1556
clearerr(stdout);
1557
982
written = 0;
1558
983
while(written < (size_t) decrypted_buffer_size){
1559
984
if(quit_now){
1575
1000
}
1576
1001
written += (size_t)ret;
1577
1002
}
1578
ret = fflush(stdout);
1579
if(ret != 0){
1580
int e = errno;
1581
if(debug){
1582
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1583
strerror(errno));
1584
}
1585
errno = e;
1586
goto mandos_end;
1587
}
1588
1003
retval = 0;
1589
1004
}
1590
1005
}
1593
1008
1594
1009
mandos_end:
1595
1010
{
1596
if(route_added){
1597
if(not delete_local_route(ip, if_index)){
1598
fprintf_plus(stderr, "Failed to delete local route to %s on"
1599
" interface %d", ip, if_index);
1600
}
1601
}
1602
1011
int e = errno;
1603
1012
free(decrypted_buffer);
1604
1013
free(buffer);
1605
1014
if(tcp_sd >= 0){
1606
ret = close(tcp_sd);
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1607
1016
}
1608
1017
if(ret == -1){
1609
1018
if(e == 0){
1634
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
1635
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1636
1045
flags,
1637
void *mc){
1046
void* mc){
1638
1047
if(r == NULL){
1639
1048
return;
1640
1049
}
1643
1052
timed out */
1644
1053
1645
1054
if(quit_now){
1646
avahi_s_service_resolver_free(r);
1647
1055
return;
1648
1056
}
1649
1057
1694
1102
const char *domain,
1695
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1696
1104
flags,
1697
void *mc){
1105
void* mc){
1698
1106
if(b == NULL){
1699
1107
return;
1700
1108
}
1760
1168
errno = old_errno;
1761
1169
}
1762
1170
1763
__attribute__((nonnull, warn_unused_result))
1764
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1765
1172
int ret;
1766
int old_errno;
1173
error_t ret_errno;
1767
1174
1768
1175
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1769
1176
if(s < 0){
1770
old_errno = errno;
1177
ret_errno = errno;
1771
1178
perror_plus("socket");
1772
errno = old_errno;
1179
errno = ret_errno;
1773
1180
return false;
1774
1181
}
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1182
strcpy(ifr->ifr_name, ifname);
1777
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1778
1184
if(ret == -1){
1779
1185
if(debug){
1780
old_errno = errno;
1186
ret_errno = errno;
1781
1187
perror_plus("ioctl SIOCGIFFLAGS");
1782
errno = old_errno;
1783
}
1784
if((close(s) == -1) and debug){
1785
old_errno = errno;
1786
perror_plus("close");
1787
errno = old_errno;
1188
errno = ret_errno;
1788
1189
}
1789
1190
return false;
1790
1191
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1796
1192
return true;
1797
1193
}
1798
1194
1799
__attribute__((nonnull, warn_unused_result))
1800
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1801
1196
1802
1197
/* Reject the loopback device */
1844
1239
* corresponds to an acceptable network device.
1845
1240
* (This function is passed to scandir(3) as a filter function.)
1846
1241
*/
1847
__attribute__((nonnull, warn_unused_result))
1848
1242
int good_interface(const struct dirent *if_entry){
1849
1243
if(if_entry->d_name[0] == '.'){
1850
1244
return 0;
1868
1262
/*
1869
1263
* This function determines if a network interface is up.
1870
1264
*/
1871
__attribute__((nonnull, warn_unused_result))
1872
1265
bool interface_is_up(const char *interface){
1873
1266
struct ifreq ifr;
1874
1267
if(not get_flags(interface, &ifr)){
1885
1278
/*
1886
1279
* This function determines if a network interface is running
1887
1280
*/
1888
__attribute__((nonnull, warn_unused_result))
1889
1281
bool interface_is_running(const char *interface){
1890
1282
struct ifreq ifr;
1891
1283
if(not get_flags(interface, &ifr)){
1899
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1900
1292
}
1901
1293
1902
__attribute__((nonnull, pure, warn_unused_result))
1903
1294
int notdotentries(const struct dirent *direntry){
1904
1295
/* Skip "." and ".." */
1905
1296
if(direntry->d_name[0] == '.'
1912
1303
}
1913
1304
1914
1305
/* Is this directory entry a runnable program? */
1915
__attribute__((nonnull, warn_unused_result))
1916
1306
int runnable_hook(const struct dirent *direntry){
1917
1307
int ret;
1918
1308
size_t sret;
1926
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1927
1317
"abcdefghijklmnopqrstuvwxyz"
1928
1318
"0123456789"
1929
"_.-");
1319
"_-");
1930
1320
if((direntry->d_name)[sret] != '\0'){
1931
1321
/* Contains non-allowed characters */
1932
1322
if(debug){
1936
1326
return 0;
1937
1327
}
1938
1328
1939
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1940
1337
if(ret == -1){
1941
1338
if(debug){
1942
1339
perror_plus("Could not stat hook");
1966
1363
return 1;
1967
1364
}
1968
1365
1969
__attribute__((nonnull, warn_unused_result))
1970
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1971
1367
mandos_context *mc){
1972
1368
int ret;
2040
1436
}
2041
1437
}
2042
1438
2043
__attribute__((nonnull))
2044
void run_network_hooks(const char *mode, const char *interface,
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
2045
1492
const float delay){
2046
struct dirent **direntries = NULL;
2047
if(hookdir_fd == -1){
2048
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2049
| O_CLOEXEC);
2050
if(hookdir_fd == -1){
2051
if(errno == ENOENT){
2052
if(debug){
2053
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2054
" found\n", hookdir);
2055
}
2056
} else {
2057
perror_plus("open");
2058
}
2059
return;
2060
}
2061
}
2062
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2063
if(devnull == -1){
2064
perror_plus("open(\"/dev/null\", O_RDONLY)");
2065
return;
2066
}
2067
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2068
runnable_hook, alphasort);
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
2069
1496
if(numhooks == -1){
2070
perror_plus("scandir");
2071
close(devnull);
2072
return;
2073
}
2074
struct dirent *direntry;
2075
int ret;
2076
for(int i = 0; i < numhooks; i++){
2077
direntry = direntries[i];
2078
if(debug){
2079
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2080
direntry->d_name);
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
2081
1504
}
2082
pid_t hook_pid = fork();
2083
if(hook_pid == 0){
2084
/* Child */
2085
/* Raise privileges */
2086
errno = raise_privileges_permanently();
2087
if(errno != 0){
2088
perror_plus("Failed to raise privileges");
2089
_exit(EX_NOPERM);
2090
}
2091
/* Set group */
2092
errno = 0;
2093
ret = setgid(0);
2094
if(ret == -1){
2095
perror_plus("setgid");
2096
_exit(EX_NOPERM);
2097
}
2098
/* Reset supplementary groups */
2099
errno = 0;
2100
ret = setgroups(0, NULL);
2101
if(ret == -1){
2102
perror_plus("setgroups");
2103
_exit(EX_NOPERM);
2104
}
2105
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2106
if(ret == -1){
2107
perror_plus("setenv");
2108
_exit(EX_OSERR);
2109
}
2110
ret = setenv("DEVICE", interface, 1);
2111
if(ret == -1){
2112
perror_plus("setenv");
2113
_exit(EX_OSERR);
2114
}
2115
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2116
if(ret == -1){
2117
perror_plus("setenv");
2118
_exit(EX_OSERR);
2119
}
2120
ret = setenv("MODE", mode, 1);
2121
if(ret == -1){
2122
perror_plus("setenv");
2123
_exit(EX_OSERR);
2124
}
2125
char *delaystring;
2126
ret = asprintf(&delaystring, "%f", (double)delay);
2127
if(ret == -1){
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
2128
1514
perror_plus("asprintf");
2129
_exit(EX_OSERR);
2130
}
2131
ret = setenv("DELAY", delaystring, 1);
2132
if(ret == -1){
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
2133
1573
free(delaystring);
2134
perror_plus("setenv");
2135
_exit(EX_OSERR);
2136
}
2137
free(delaystring);
2138
if(connect_to != NULL){
2139
ret = setenv("CONNECT", connect_to, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
}
2145
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2146
direntry->d_name,
2147
O_RDONLY));
2148
if(hook_fd == -1){
2149
perror_plus("openat");
2150
_exit(EXIT_FAILURE);
2151
}
2152
if(close(hookdir_fd) == -1){
2153
perror_plus("close");
2154
_exit(EXIT_FAILURE);
2155
}
2156
ret = dup2(devnull, STDIN_FILENO);
2157
if(ret == -1){
2158
perror_plus("dup2(devnull, STDIN_FILENO)");
2159
_exit(EX_OSERR);
2160
}
2161
ret = close(devnull);
2162
if(ret == -1){
2163
perror_plus("close");
2164
_exit(EX_OSERR);
2165
}
2166
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2167
if(ret == -1){
2168
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2169
_exit(EX_OSERR);
2170
}
2171
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2172
environ) == -1){
2173
perror_plus("fexecve");
2174
_exit(EXIT_FAILURE);
2175
}
2176
} else {
2177
if(hook_pid == -1){
2178
perror_plus("fork");
2179
free(direntry);
2180
continue;
2181
}
2182
int status;
2183
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2184
perror_plus("waitpid");
2185
free(direntry);
2186
continue;
2187
}
2188
if(WIFEXITED(status)){
2189
if(WEXITSTATUS(status) != 0){
2190
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2191
" with status %d\n", direntry->d_name,
2192
WEXITSTATUS(status));
2193
free(direntry);
2194
continue;
2195
}
2196
} else if(WIFSIGNALED(status)){
2197
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2198
" signal %d\n", direntry->d_name,
2199
WTERMSIG(status));
2200
free(direntry);
2201
continue;
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
2202
1585
} else {
2203
fprintf_plus(stderr, "Warning: network hook \"%s\""
2204
" crashed\n", direntry->d_name);
2205
free(direntry);
2206
continue;
2207
}
2208
}
2209
if(debug){
2210
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2211
direntry->d_name);
2212
}
2213
free(direntry);
2214
}
2215
free(direntries);
2216
if(close(hookdir_fd) == -1){
2217
perror_plus("close");
2218
} else {
2219
hookdir_fd = -1;
2220
}
2221
close(devnull);
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
2222
1622
}
2223
1623
2224
__attribute__((nonnull, warn_unused_result))
2225
int bring_up_interface(const char *const interface,
2226
const float delay){
2227
int old_errno = errno;
2228
int ret;
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
2229
1630
struct ifreq network;
2230
1631
unsigned int if_index = if_nametoindex(interface);
2231
1632
if(if_index == 0){
2240
1641
}
2241
1642
2242
1643
if(not interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network)){
1644
if(not get_flags(interface, &network) and debug){
2246
1645
ret_errno = errno;
2247
1646
fprintf_plus(stderr, "Failed to get flags for interface "
2248
1647
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
1648
return ret_errno;
2251
1649
}
2252
network.ifr_flags |= IFF_UP; /* set flag */
1650
network.ifr_flags |= IFF_UP;
2253
1651
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
2256
1654
ret_errno = errno;
2257
1655
perror_plus("socket");
2258
1656
errno = old_errno;
2259
1657
return ret_errno;
2260
1658
}
2261
1659
2262
1660
if(quit_now){
2263
ret = close(sd);
2264
if(ret == -1){
2265
perror_plus("close");
2266
}
1661
close(sd);
2267
1662
errno = old_errno;
2268
1663
return EINTR;
2269
1664
}
2273
1668
interface);
2274
1669
}
2275
1670
2276
/* Raise privileges */
2277
ret_errno = raise_privileges();
2278
if(ret_errno != 0){
2279
errno = ret_errno;
2280
perror_plus("Failed to raise privileges");
2281
}
1671
/* Raise priviliges */
1672
raise_privileges();
2282
1673
2283
1674
#ifdef __linux__
2284
int ret_linux;
2285
bool restore_loglevel = false;
2286
if(ret_errno == 0){
2287
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2288
messages about the network interface to mess up the prompt */
2289
ret_linux = klogctl(8, NULL, 5);
2290
if(ret_linux == -1){
2291
perror_plus("klogctl");
2292
} else {
2293
restore_loglevel = true;
2294
}
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
2295
1682
}
2296
1683
#endif /* __linux__ */
2297
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2298
ioctl_errno = errno;
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
2299
1686
#ifdef __linux__
2300
1687
if(restore_loglevel){
2301
1688
ret_linux = klogctl(7, NULL, 0);
2305
1692
}
2306
1693
#endif /* __linux__ */
2307
1694
2308
/* If raise_privileges() succeeded above */
2309
if(ret_errno == 0){
2310
/* Lower privileges */
2311
ret_errno = lower_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to lower privileges");
2315
}
2316
}
1695
/* Lower privileges */
1696
lower_privileges();
2317
1697
2318
1698
/* Close the socket */
2319
ret = close(sd);
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2320
1700
if(ret == -1){
2321
1701
perror_plus("close");
2322
1702
}
2323
1703
2324
1704
if(ret_setflags == -1){
2325
errno = ioctl_errno;
1705
errno = ret_errno;
2326
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2327
1707
errno = old_errno;
2328
return ioctl_errno;
1708
return ret_errno;
2329
1709
}
2330
1710
} else if(debug){
2331
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2334
1714
2335
1715
/* Sleep checking until interface is running.
2336
1716
Check every 0.25s, up to total time of delay */
2337
for(int i = 0; i < delay * 4; i++){
1717
for(int i=0; i < delay * 4; i++){
2338
1718
if(interface_is_running(interface)){
2339
1719
break;
2340
1720
}
2349
1729
return 0;
2350
1730
}
2351
1731
2352
__attribute__((nonnull, warn_unused_result))
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
2355
1734
struct ifreq network;
2356
1735
unsigned int if_index = if_nametoindex(interface);
2357
1736
if(if_index == 0){
2360
1739
return ENXIO;
2361
1740
}
2362
1741
if(interface_is_up(interface)){
2363
int ret_errno = 0;
2364
int ioctl_errno = 0;
1742
error_t ret_errno = 0;
2365
1743
if(not get_flags(interface, &network) and debug){
2366
1744
ret_errno = errno;
2367
1745
fprintf_plus(stderr, "Failed to get flags for interface "
2368
1746
"\"%s\"\n", interface);
2369
errno = old_errno;
2370
1747
return ret_errno;
2371
1748
}
2372
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2373
1750
2374
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2375
if(sd == -1){
1752
if(sd < 0){
2376
1753
ret_errno = errno;
2377
1754
perror_plus("socket");
2378
1755
errno = old_errno;
2384
1761
interface);
2385
1762
}
2386
1763
2387
/* Raise privileges */
2388
ret_errno = raise_privileges();
2389
if(ret_errno != 0){
2390
errno = ret_errno;
2391
perror_plus("Failed to raise privileges");
2392
}
1764
/* Raise priviliges */
1765
raise_privileges();
2393
1766
2394
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2395
ioctl_errno = errno;
1768
ret_errno = errno;
2396
1769
2397
/* If raise_privileges() succeeded above */
2398
if(ret_errno == 0){
2399
/* Lower privileges */
2400
ret_errno = lower_privileges();
2401
if(ret_errno != 0){
2402
errno = ret_errno;
2403
perror_plus("Failed to lower privileges");
2404
}
2405
}
1770
/* Lower privileges */
1771
lower_privileges();
2406
1772
2407
1773
/* Close the socket */
2408
int ret = close(sd);
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2409
1775
if(ret == -1){
2410
1776
perror_plus("close");
2411
1777
}
2412
1778
2413
1779
if(ret_setflags == -1){
2414
errno = ioctl_errno;
1780
errno = ret_errno;
2415
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2416
1782
errno = old_errno;
2417
return ioctl_errno;
1783
return ret_errno;
2418
1784
}
2419
1785
} else if(debug){
2420
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2426
1792
}
2427
1793
2428
1794
int main(int argc, char *argv[]){
2429
mandos_context mc = { .server = NULL, .dh_bits = 0,
2430
.priority = "SECURE256:!CTYPE-X.509"
2431
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2432
.current_server = NULL, .interfaces = NULL,
2433
.interfaces_size = 0 };
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
2434
1799
AvahiSServiceBrowser *sb = NULL;
2435
1800
error_t ret_errno;
2436
1801
int ret;
2439
1804
int exitcode = EXIT_SUCCESS;
2440
1805
char *interfaces_to_take_down = NULL;
2441
1806
size_t interfaces_to_take_down_size = 0;
2442
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2443
char old_tempdir[] = "/tmp/mandosXXXXXX";
2444
char *tempdir = NULL;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
2445
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2446
1810
const char *seckey = PATHDIR "/" SECKEY;
2447
1811
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
1812
char *interfaces_hooks = NULL;
2450
1813
2451
1814
bool gnutls_initialized = false;
2504
1867
.doc = "Bit length of the prime number used in the"
2505
1868
" Diffie-Hellman key exchange",
2506
1869
.group = 2 },
2507
{ .name = "dh-params", .key = 134,
2508
.arg = "FILE",
2509
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2510
" for the Diffie-Hellman key exchange",
2511
.group = 2 },
2512
1870
{ .name = "priority", .key = 130,
2513
1871
.arg = "STRING",
2514
1872
.doc = "GnuTLS priority string for the TLS handshake",
2569
1927
}
2570
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2571
1929
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
2575
1930
case 130: /* --priority */
2576
1931
mc.priority = arg;
2577
1932
break;
2617
1972
.args_doc = "",
2618
1973
.doc = "Mandos client -- Get and decrypt"
2619
1974
" passwords from a Mandos server" };
2620
ret_errno = argp_parse(&argp, argc, argv,
2621
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2622
switch(ret_errno){
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
2623
1978
case 0:
2624
1979
break;
2625
1980
case ENOMEM:
2626
1981
default:
2627
errno = ret_errno;
1982
errno = ret;
2628
1983
perror_plus("argp_parse");
2629
1984
exitcode = EX_OSERR;
2630
1985
goto end;
2633
1988
goto end;
2634
1989
}
2635
1990
}
2636
1991
2637
1992
{
2638
1993
/* Work around Debian bug #633582:
2639
<https://bugs.debian.org/633582> */
1994
<http://bugs.debian.org/633582> */
2640
1995
2641
/* Re-raise privileges */
2642
ret = raise_privileges();
2643
if(ret != 0){
2644
errno = ret;
2645
perror_plus("Failed to raise privileges");
2646
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2647
1998
struct stat st;
2648
1999
2649
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2663
2014
}
2664
2015
}
2665
2016
}
2666
close(seckey_fd);
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2667
2018
}
2668
2019
}
2669
2020
2670
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2671
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2672
2023
if(pubkey_fd == -1){
2684
2035
}
2685
2036
}
2686
2037
}
2687
close(pubkey_fd);
2688
}
2689
}
2690
2691
if(dh_params_file != NULL
2692
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2693
int dhparams_fd = open(dh_params_file, O_RDONLY);
2694
if(dhparams_fd == -1){
2695
perror_plus("open");
2696
} else {
2697
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2698
if(ret == -1){
2699
perror_plus("fstat");
2700
} else {
2701
if(S_ISREG(st.st_mode)
2702
and st.st_uid == 0 and st.st_gid == 0){
2703
ret = fchown(dhparams_fd, uid, gid);
2704
if(ret == -1){
2705
perror_plus("fchown");
2706
}
2707
}
2708
}
2709
close(dhparams_fd);
2710
}
2711
}
2712
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2713
2042
/* Lower privileges */
2714
ret = lower_privileges();
2715
if(ret != 0){
2716
errno = ret;
2717
perror_plus("Failed to lower privileges");
2718
}
2043
lower_privileges();
2719
2044
}
2720
2045
}
2721
2046
2747
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2748
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2749
2074
}
2750
run_network_hooks("start", interfaces_hooks != NULL ?
2751
interfaces_hooks : "", delay);
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2752
2079
}
2753
2080
2754
2081
if(not debug){
2832
2159
2833
2160
/* If no interfaces were specified, make a list */
2834
2161
if(mc.interfaces == NULL){
2835
struct dirent **direntries = NULL;
2162
struct dirent **direntries;
2836
2163
/* Look for any good interfaces */
2837
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2838
2165
alphasort);
2844
2171
if(ret_errno != 0){
2845
2172
errno = ret_errno;
2846
2173
perror_plus("argz_add");
2847
free(direntries[i]);
2848
2174
continue;
2849
2175
}
2850
2176
if(debug){
2851
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2852
2178
direntries[i]->d_name);
2853
2179
}
2854
free(direntries[i]);
2855
2180
}
2856
2181
free(direntries);
2857
2182
} else {
2858
if(ret == 0){
2859
free(direntries);
2860
}
2183
free(direntries);
2861
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2862
2185
exitcode = EXIT_FAILURE;
2863
2186
goto end;
2886
2209
break;
2887
2210
}
2888
2211
bool interface_was_up = interface_is_up(interface);
2889
errno = bring_up_interface(interface, delay);
2212
ret = bring_up_interface(interface, delay);
2890
2213
if(not interface_was_up){
2891
if(errno != 0){
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2894
2217
} else {
2895
errno = argz_add(&interfaces_to_take_down,
2896
&interfaces_to_take_down_size,
2897
interface);
2898
if(errno != 0){
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2899
2223
perror_plus("argz_add");
2900
2224
}
2901
2225
}
2919
2243
goto end;
2920
2244
}
2921
2245
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2923
2247
if(ret == -1){
2924
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2925
2249
exitcode = EX_UNAVAILABLE;
2932
2256
goto end;
2933
2257
}
2934
2258
2935
/* Try /run/tmp before /tmp */
2936
tempdir = mkdtemp(run_tempdir);
2937
if(tempdir == NULL and errno == ENOENT){
2938
if(debug){
2939
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2940
run_tempdir, old_tempdir);
2941
}
2942
tempdir = mkdtemp(old_tempdir);
2943
}
2944
if(tempdir == NULL){
2259
if(mkdtemp(tempdir) == NULL){
2945
2260
perror_plus("mkdtemp");
2946
2261
goto end;
2947
2262
}
2263
tempdir_created = true;
2948
2264
2949
2265
if(quit_now){
2950
2266
goto end;
3047
2363
3048
2364
/* Allocate a new server */
3049
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3050
&config, NULL, NULL, &ret);
2366
&config, NULL, NULL, &ret_errno);
3051
2367
3052
2368
/* Free the Avahi configuration data */
3053
2369
avahi_server_config_free(&config);
3056
2372
/* Check if creating the Avahi server object succeeded */
3057
2373
if(mc.server == NULL){
3058
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3059
avahi_strerror(ret));
2375
avahi_strerror(ret_errno));
3060
2376
exitcode = EX_UNAVAILABLE;
3061
2377
goto end;
3062
2378
}
3086
2402
if(debug){
3087
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
3088
2404
}
3089
2405
3090
2406
ret = avahi_loop_with_timeout(simple_poll,
3091
2407
(int)(retry_interval * 1000), &mc);
3092
2408
if(debug){
3097
2413
end:
3098
2414
3099
2415
if(debug){
3100
if(signal_received){
3101
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3102
argv[0], signal_received,
3103
strsignal(signal_received));
3104
} else {
3105
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3106
}
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3107
2417
}
3108
2418
3109
2419
/* Cleanup things */
3120
2430
3121
2431
if(gnutls_initialized){
3122
2432
gnutls_certificate_free_credentials(mc.cred);
2433
gnutls_global_deinit();
3123
2434
gnutls_dh_params_deinit(mc.dh_params);
3124
2435
}
3125
2436
3133
2444
mc.current_server->prev->next = NULL;
3134
2445
while(mc.current_server != NULL){
3135
2446
server *next = mc.current_server->next;
3136
#ifdef __GNUC__
3137
#pragma GCC diagnostic push
3138
#pragma GCC diagnostic ignored "-Wcast-qual"
3139
#endif
3140
free((char *)(mc.current_server->ip));
3141
#ifdef __GNUC__
3142
#pragma GCC diagnostic pop
3143
#endif
3144
2447
free(mc.current_server);
3145
2448
mc.current_server = next;
3146
2449
}
3147
2450
}
3148
2451
3149
/* Re-raise privileges */
2452
/* Re-raise priviliges */
3150
2453
{
3151
ret = raise_privileges();
3152
if(ret != 0){
3153
errno = ret;
3154
perror_plus("Failed to raise privileges");
3155
} else {
3156
3157
/* Run network hooks */
3158
run_network_hooks("stop", interfaces_hooks != NULL ?
3159
interfaces_hooks : "", delay);
3160
3161
/* Take down the network interfaces which were brought up */
3162
{
3163
char *interface = NULL;
3164
while((interface = argz_next(interfaces_to_take_down,
3165
interfaces_to_take_down_size,
3166
interface))){
3167
ret = take_down_interface(interface);
3168
if(ret != 0){
3169
errno = ret;
3170
perror_plus("Failed to take down interface");
3171
}
3172
}
3173
if(debug and (interfaces_to_take_down == NULL)){
3174
fprintf_plus(stderr, "No interfaces needed to be taken"
3175
" down\n");
3176
}
3177
}
3178
}
3179
3180
ret = lower_privileges_permanently();
3181
if(ret != 0){
3182
errno = ret;
3183
perror_plus("Failed to lower privileges permanently");
3184
}
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2470
}
2471
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2475
}
2476
}
2477
2478
lower_privileges_permanently();
3185
2479
}
3186
2480
3187
2481
free(interfaces_to_take_down);
3188
2482
free(interfaces_hooks);
3189
2483
3190
void clean_dir_at(int base, const char * const dirname,
3191
uintmax_t level){
2484
/* Removes the GPGME temp directory and all files inside */
2485
if(tempdir_created){
3192
2486
struct dirent **direntries = NULL;
3193
int dret;
3194
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3195
O_RDONLY
3196
| O_NOFOLLOW
3197
| O_DIRECTORY
3198
| O_PATH));
3199
if(dir_fd == -1){
3200
perror_plus("open");
3201
return;
3202
}
3203
int numentries = scandirat(dir_fd, ".", &direntries,
3204
notdotentries, alphasort);
3205
if(numentries >= 0){
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
alphasort);
2490
if(numentries > 0){
3206
2491
for(int i = 0; i < numentries; i++){
3207
if(debug){
3208
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3209
dirname, direntries[i]->d_name);
3210
}
3211
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3212
if(dret == -1){
3213
if(errno == EISDIR){
3214
dret = unlinkat(dir_fd, direntries[i]->d_name,
3215
AT_REMOVEDIR);
3216
}
3217
if((dret == -1) and (errno == ENOTEMPTY)
3218
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3219
== 0) and (level == 0)){
3220
/* Recurse only in this special case */
3221
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3222
dret = 0;
3223
}
3224
if((dret == -1) and (errno != ENOENT)){
3225
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3226
direntries[i]->d_name, strerror(errno));
3227
}
3228
}
3229
free(direntries[i]);
3230
}
3231
3232
/* need to clean even if 0 because man page doesn't specify */
3233
free(direntries);
3234
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3235
if(dret == -1 and errno != ENOENT){
3236
perror_plus("rmdir");
3237
}
3238
} else {
3239
perror_plus("scandirat");
3240
}
3241
close(dir_fd);
3242
}
3243
3244
/* Removes the GPGME temp directory and all files inside */
3245
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);
2492
direntry = direntries[i];
2493
char *fullname = NULL;
2494
ret = asprintf(&fullname, "%s/%s", tempdir,
2495
direntry->d_name);
2496
if(ret < 0){
2497
perror_plus("asprintf");
2498
continue;
2499
}
2500
ret = remove(fullname);
2501
if(ret == -1){
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
2504
}
2505
free(fullname);
2506
}
2507
}
2508
2509
/* need to clean even if 0 because man page doesn't specify */
2510
free(direntries);
2511
if(numentries == -1){
2512
perror_plus("scandir");
2513
}
2514
ret = rmdir(tempdir);
2515
if(ret == -1 and errno != ENOENT){
2516
perror_plus("rmdir");
2517
}
3247
2518
}
3248
2519
3249
2520
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0