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237.7.240
(compared to revision 237.7.501)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:59:20 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140607215920-r4qkj7ktnjyqmrn5
Make mandos-client use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
*/
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
240
233
.af = af };
241
234
if(new_server->ip == NULL){
242
235
perror_plus("strdup");
243
free(new_server);
244
236
return false;
245
237
}
246
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
239
if(ret == -1){
248
240
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
241
return false;
259
242
}
260
243
/* Special case of first server */
272
255
return true;
273
256
}
274
257
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
258
/*
328
259
* Initialize GPGME.
329
260
*/
349
280
return false;
350
281
}
351
282
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
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
403
284
if(rc != GPG_ERR_NO_ERROR){
404
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
412
293
gpgme_strsource(rc), gpgme_strerror(rc));
413
294
return false;
414
295
}
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
296
491
ret = close(fd);
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
492
298
if(ret == -1){
493
299
perror_plus("close");
494
300
}
533
339
/* Create new GPGME "context" */
534
340
rc = gpgme_new(&(mc->ctx));
535
341
if(rc != GPG_ERR_NO_ERROR){
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
538
345
return false;
539
346
}
540
347
576
383
/* Create new empty GPGME data buffer for the plaintext */
577
384
rc = gpgme_data_new(&dh_plain);
578
385
if(rc != GPG_ERR_NO_ERROR){
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
580
388
gpgme_strsource(rc), gpgme_strerror(rc));
581
389
gpgme_data_release(dh_crypto);
582
390
return -1;
595
403
if(result == NULL){
596
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
597
405
} 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");
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
604
410
if(result->file_name != NULL){
605
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
606
412
}
607
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
609
r = r->next){
413
gpgme_recipient_t recipient;
414
recipient = result->recipients;
415
while(recipient != NULL){
610
416
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);
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
613
420
fprintf_plus(stderr, "Secret key available: %s\n",
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
615
424
}
616
425
}
617
426
}
673
482
return plaintext_length;
674
483
}
675
484
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
485
__attribute__((warn_unused_result))
684
486
static const char *safer_gnutls_strerror(int value){
685
487
const char *ret = gnutls_strerror(value);
686
return safe_string(ret);
488
if(ret == NULL)
489
ret = "(unknown)";
490
return ret;
687
491
}
688
492
689
493
/* GnuTLS log function callback */
693
497
fprintf_plus(stderr, "GnuTLS: %s", string);
694
498
}
695
499
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
__attribute__((nonnull, warn_unused_result))
697
501
static int init_gnutls_global(const char *pubkeyfilename,
698
502
const char *seckeyfilename,
699
const char *dhparamsfilename,
700
503
mandos_context *mc){
701
504
int ret;
702
unsigned int uret;
703
505
704
506
if(debug){
705
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
706
508
}
707
509
510
ret = gnutls_global_init();
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
514
return -1;
515
}
516
708
517
if(debug){
709
518
/* "Use a log level over 10 to enable all debugging options."
710
519
* - GnuTLS manual
718
527
if(ret != GNUTLS_E_SUCCESS){
719
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
720
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
721
531
return -1;
722
532
}
723
533
748
558
safer_gnutls_strerror(ret));
749
559
goto globalfail;
750
560
}
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
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
565
goto globalfail;
566
}
567
928
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
929
569
930
570
return 0;
932
572
globalfail:
933
573
934
574
gnutls_certificate_free_credentials(mc->cred);
575
gnutls_global_deinit();
935
576
gnutls_dh_params_deinit(mc->dh_params);
936
577
return -1;
937
578
}
989
630
/* ignore client certificate if any. */
990
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
991
632
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
634
992
635
return 0;
993
636
}
994
637
996
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
997
640
__attribute__((unused)) const char *txt){}
998
641
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
642
/* Called when a Mandos server is found */
1166
643
__attribute__((nonnull, warn_unused_result))
1167
644
static int start_mandos_communication(const char *ip, in_port_t port,
1178
655
int retval = -1;
1179
656
gnutls_session_t session;
1180
657
int pf; /* Protocol family */
1181
bool route_added = false;
1182
658
1183
659
errno = 0;
1184
660
1206
682
bool match = false;
1207
683
{
1208
684
char *interface = NULL;
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1211
interface))){
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
1212
687
if(if_nametoindex(interface) == (unsigned int)if_index){
1213
688
match = true;
1214
689
break;
1243
718
PRIuMAX "\n", ip, (uintmax_t)port);
1244
719
}
1245
720
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
1247
722
if(tcp_sd < 0){
1248
723
int e = errno;
1249
724
perror_plus("socket");
1256
731
goto mandos_end;
1257
732
}
1258
733
734
memset(&to, 0, sizeof(to));
1259
735
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);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1263
738
} 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);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1267
741
}
1268
742
if(ret < 0 ){
1269
743
int e = errno;
1339
813
goto mandos_end;
1340
814
}
1341
815
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;
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
1397
835
}
1398
836
1399
837
const char *out = mandos_protocol_version;
1553
991
&decrypted_buffer, mc);
1554
992
if(decrypted_buffer_size >= 0){
1555
993
1556
clearerr(stdout);
1557
994
written = 0;
1558
995
while(written < (size_t) decrypted_buffer_size){
1559
996
if(quit_now){
1575
1012
}
1576
1013
written += (size_t)ret;
1577
1014
}
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
1015
retval = 0;
1589
1016
}
1590
1017
}
1593
1020
1594
1021
mandos_end:
1595
1022
{
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
1023
int e = errno;
1603
1024
free(decrypted_buffer);
1604
1025
free(buffer);
1605
1026
if(tcp_sd >= 0){
1606
ret = close(tcp_sd);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1607
1028
}
1608
1029
if(ret == -1){
1609
1030
if(e == 0){
1621
1042
return retval;
1622
1043
}
1623
1044
1045
__attribute__((nonnull))
1624
1046
static void resolve_callback(AvahiSServiceResolver *r,
1625
1047
AvahiIfIndex interface,
1626
1048
AvahiProtocol proto,
1643
1065
timed out */
1644
1066
1645
1067
if(quit_now){
1646
avahi_s_service_resolver_free(r);
1647
1068
return;
1648
1069
}
1649
1070
1763
1184
__attribute__((nonnull, warn_unused_result))
1764
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1765
1186
int ret;
1766
int old_errno;
1187
error_t ret_errno;
1767
1188
1768
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1769
1190
if(s < 0){
1770
old_errno = errno;
1191
ret_errno = errno;
1771
1192
perror_plus("socket");
1772
errno = old_errno;
1193
errno = ret_errno;
1773
1194
return false;
1774
1195
}
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
strcpy(ifr->ifr_name, ifname);
1777
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1778
1198
if(ret == -1){
1779
1199
if(debug){
1780
old_errno = errno;
1200
ret_errno = errno;
1781
1201
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;
1202
errno = ret_errno;
1788
1203
}
1789
1204
return false;
1790
1205
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1796
1206
return true;
1797
1207
}
1798
1208
1936
1346
return 0;
1937
1347
}
1938
1348
1939
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1940
1357
if(ret == -1){
1941
1358
if(debug){
1942
1359
perror_plus("Could not stat hook");
1943
1360
}
1944
1361
return 0;
1945
1362
}
1363
free(fullname);
1946
1364
if(not (S_ISREG(st.st_mode))){
1947
1365
/* Not a regular file */
1948
1366
if(debug){
2040
1458
}
2041
1459
}
2042
1460
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
2043
1536
__attribute__((nonnull))
2044
1537
void run_network_hooks(const char *mode, const char *interface,
2045
1538
const float delay){
2046
struct dirent **direntries = NULL;
1539
struct dirent **direntries;
2047
1540
if(hookdir_fd == -1){
2048
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2049
| O_CLOEXEC);
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
2050
1548
if(hookdir_fd == -1){
2051
1549
if(errno == ENOENT){
2052
1550
if(debug){
2058
1556
}
2059
1557
return;
2060
1558
}
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
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
2067
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2068
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
2069
1583
if(numhooks == -1){
2070
1584
perror_plus("scandir");
2071
close(devnull);
2072
1585
return;
2073
1586
}
2074
1587
struct dirent *direntry;
2075
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
2076
1590
for(int i = 0; i < numhooks; i++){
2077
1591
direntry = direntries[i];
2078
1592
if(debug){
2083
1597
if(hook_pid == 0){
2084
1598
/* Child */
2085
1599
/* Raise privileges */
2086
errno = raise_privileges_permanently();
2087
if(errno != 0){
1600
if(raise_privileges_permanently() != 0){
2088
1601
perror_plus("Failed to raise privileges");
2089
1602
_exit(EX_NOPERM);
2090
1603
}
2102
1615
perror_plus("setgroups");
2103
1616
_exit(EX_NOPERM);
2104
1617
}
1618
ret = dup2(devnull, STDIN_FILENO);
1619
if(ret == -1){
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1621
_exit(EX_OSERR);
1622
}
1623
ret = close(devnull);
1624
if(ret == -1){
1625
perror_plus("close");
1626
_exit(EX_OSERR);
1627
}
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1629
if(ret == -1){
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1631
_exit(EX_OSERR);
1632
}
2105
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2106
1634
if(ret == -1){
2107
1635
perror_plus("setenv");
2142
1670
_exit(EX_OSERR);
2143
1671
}
2144
1672
}
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){
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
2173
1675
perror_plus("fexecve");
2174
1676
_exit(EXIT_FAILURE);
2175
1677
}
2176
1678
} else {
2177
if(hook_pid == -1){
2178
perror_plus("fork");
2179
free(direntry);
2180
continue;
2181
}
2182
1679
int status;
2183
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2184
1681
perror_plus("waitpid");
2185
free(direntry);
2186
1682
continue;
2187
1683
}
2188
1684
if(WIFEXITED(status)){
2190
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2191
1687
" with status %d\n", direntry->d_name,
2192
1688
WEXITSTATUS(status));
2193
free(direntry);
2194
1689
continue;
2195
1690
}
2196
1691
} else if(WIFSIGNALED(status)){
2197
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2198
1693
" signal %d\n", direntry->d_name,
2199
1694
WTERMSIG(status));
2200
free(direntry);
2201
1695
continue;
2202
1696
} else {
2203
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
2204
1698
" crashed\n", direntry->d_name);
2205
free(direntry);
2206
1699
continue;
2207
1700
}
2208
1701
}
2210
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2211
1704
direntry->d_name);
2212
1705
}
2213
free(direntry);
2214
1706
}
2215
free(direntries);
2216
if(close(hookdir_fd) == -1){
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2217
1708
perror_plus("close");
2218
1709
} else {
2219
1710
hookdir_fd = -1;
2222
1713
}
2223
1714
2224
1715
__attribute__((nonnull, warn_unused_result))
2225
int bring_up_interface(const char *const interface,
2226
const float delay){
2227
int old_errno = errno;
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
2228
1719
int ret;
2229
1720
struct ifreq network;
2230
1721
unsigned int if_index = if_nametoindex(interface);
2240
1731
}
2241
1732
2242
1733
if(not interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
1734
error_t ret_errno = 0, ioctl_errno = 0;
2245
1735
if(not get_flags(interface, &network)){
2246
1736
ret_errno = errno;
2247
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2260
1750
}
2261
1751
2262
1752
if(quit_now){
2263
ret = close(sd);
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2264
1754
if(ret == -1){
2265
1755
perror_plus("close");
2266
1756
}
2276
1766
/* Raise privileges */
2277
1767
ret_errno = raise_privileges();
2278
1768
if(ret_errno != 0){
2279
errno = ret_errno;
2280
1769
perror_plus("Failed to raise privileges");
2281
1770
}
2282
1771
2316
1805
}
2317
1806
2318
1807
/* Close the socket */
2319
ret = close(sd);
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2320
1809
if(ret == -1){
2321
1810
perror_plus("close");
2322
1811
}
2334
1823
2335
1824
/* Sleep checking until interface is running.
2336
1825
Check every 0.25s, up to total time of delay */
2337
for(int i = 0; i < delay * 4; i++){
1826
for(int i=0; i < delay * 4; i++){
2338
1827
if(interface_is_running(interface)){
2339
1828
break;
2340
1829
}
2350
1839
}
2351
1840
2352
1841
__attribute__((nonnull, warn_unused_result))
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
2355
1844
struct ifreq network;
2356
1845
unsigned int if_index = if_nametoindex(interface);
2357
1846
if(if_index == 0){
2360
1849
return ENXIO;
2361
1850
}
2362
1851
if(interface_is_up(interface)){
2363
int ret_errno = 0;
2364
int ioctl_errno = 0;
1852
error_t ret_errno = 0, ioctl_errno = 0;
2365
1853
if(not get_flags(interface, &network) and debug){
2366
1854
ret_errno = errno;
2367
1855
fprintf_plus(stderr, "Failed to get flags for interface "
2387
1875
/* Raise privileges */
2388
1876
ret_errno = raise_privileges();
2389
1877
if(ret_errno != 0){
2390
errno = ret_errno;
2391
1878
perror_plus("Failed to raise privileges");
2392
1879
}
2393
1880
2405
1892
}
2406
1893
2407
1894
/* Close the socket */
2408
int ret = close(sd);
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2409
1896
if(ret == -1){
2410
1897
perror_plus("close");
2411
1898
}
2426
1913
}
2427
1914
2428
1915
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 };
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
2434
1920
AvahiSServiceBrowser *sb = NULL;
2435
1921
error_t ret_errno;
2436
1922
int ret;
2445
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2446
1932
const char *seckey = PATHDIR "/" SECKEY;
2447
1933
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
1934
char *interfaces_hooks = NULL;
2450
1935
2451
1936
bool gnutls_initialized = false;
2504
1989
.doc = "Bit length of the prime number used in the"
2505
1990
" Diffie-Hellman key exchange",
2506
1991
.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
1992
{ .name = "priority", .key = 130,
2513
1993
.arg = "STRING",
2514
1994
.doc = "GnuTLS priority string for the TLS handshake",
2569
2049
}
2570
2050
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2571
2051
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
2575
2052
case 130: /* --priority */
2576
2053
mc.priority = arg;
2577
2054
break;
2617
2094
.args_doc = "",
2618
2095
.doc = "Mandos client -- Get and decrypt"
2619
2096
" 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){
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2099
switch(ret){
2623
2100
case 0:
2624
2101
break;
2625
2102
case ENOMEM:
2626
2103
default:
2627
errno = ret_errno;
2104
errno = ret;
2628
2105
perror_plus("argp_parse");
2629
2106
exitcode = EX_OSERR;
2630
2107
goto end;
2633
2110
goto end;
2634
2111
}
2635
2112
}
2636
2113
2637
2114
{
2638
2115
/* Work around Debian bug #633582:
2639
<https://bugs.debian.org/633582> */
2116
<http://bugs.debian.org/633582> */
2640
2117
2641
2118
/* Re-raise privileges */
2642
ret = raise_privileges();
2643
if(ret != 0){
2644
errno = ret;
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2645
2122
perror_plus("Failed to raise privileges");
2646
2123
} else {
2647
2124
struct stat st;
2663
2140
}
2664
2141
}
2665
2142
}
2666
close(seckey_fd);
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2667
2144
}
2668
2145
}
2669
2146
2670
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2671
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2672
2149
if(pubkey_fd == -1){
2684
2161
}
2685
2162
}
2686
2163
}
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
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2713
2168
/* Lower privileges */
2714
ret = lower_privileges();
2715
if(ret != 0){
2716
errno = ret;
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2717
2172
perror_plus("Failed to lower privileges");
2718
2173
}
2719
2174
}
2832
2287
2833
2288
/* If no interfaces were specified, make a list */
2834
2289
if(mc.interfaces == NULL){
2835
struct dirent **direntries = NULL;
2290
struct dirent **direntries;
2836
2291
/* Look for any good interfaces */
2837
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2838
2293
alphasort);
2844
2299
if(ret_errno != 0){
2845
2300
errno = ret_errno;
2846
2301
perror_plus("argz_add");
2847
free(direntries[i]);
2848
2302
continue;
2849
2303
}
2850
2304
if(debug){
2851
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2852
2306
direntries[i]->d_name);
2853
2307
}
2854
free(direntries[i]);
2855
2308
}
2856
2309
free(direntries);
2857
2310
} else {
2858
if(ret == 0){
2859
free(direntries);
2860
}
2311
free(direntries);
2861
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2862
2313
exitcode = EXIT_FAILURE;
2863
2314
goto end;
2889
2340
errno = bring_up_interface(interface, delay);
2890
2341
if(not interface_was_up){
2891
2342
if(errno != 0){
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2343
perror_plus("Failed to bring up interface");
2894
2344
} else {
2895
2345
errno = argz_add(&interfaces_to_take_down,
2896
2346
&interfaces_to_take_down_size,
2919
2369
goto end;
2920
2370
}
2921
2371
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
2923
2373
if(ret == -1){
2924
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
2925
2375
exitcode = EX_UNAVAILABLE;
3047
2497
3048
2498
/* Allocate a new server */
3049
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3050
&config, NULL, NULL, &ret);
2500
&config, NULL, NULL, &ret_errno);
3051
2501
3052
2502
/* Free the Avahi configuration data */
3053
2503
avahi_server_config_free(&config);
3056
2506
/* Check if creating the Avahi server object succeeded */
3057
2507
if(mc.server == NULL){
3058
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3059
avahi_strerror(ret));
2509
avahi_strerror(ret_errno));
3060
2510
exitcode = EX_UNAVAILABLE;
3061
2511
goto end;
3062
2512
}
3097
2547
end:
3098
2548
3099
2549
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
}
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3107
2551
}
3108
2552
3109
2553
/* Cleanup things */
3120
2564
3121
2565
if(gnutls_initialized){
3122
2566
gnutls_certificate_free_credentials(mc.cred);
2567
gnutls_global_deinit();
3123
2568
gnutls_dh_params_deinit(mc.dh_params);
3124
2569
}
3125
2570
3133
2578
mc.current_server->prev->next = NULL;
3134
2579
while(mc.current_server != NULL){
3135
2580
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
2581
free(mc.current_server);
3145
2582
mc.current_server = next;
3146
2583
}
3148
2585
3149
2586
/* Re-raise privileges */
3150
2587
{
3151
ret = raise_privileges();
3152
if(ret != 0){
3153
errno = ret;
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
3154
2590
perror_plus("Failed to raise privileges");
3155
2591
} else {
3156
2592
3161
2597
/* Take down the network interfaces which were brought up */
3162
2598
{
3163
2599
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;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
3170
2606
perror_plus("Failed to take down interface");
3171
2607
}
3172
2608
}
3177
2613
}
3178
2614
}
3179
2615
3180
ret = lower_privileges_permanently();
3181
if(ret != 0){
3182
errno = ret;
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
3183
2618
perror_plus("Failed to lower privileges permanently");
3184
2619
}
3185
2620
}
3187
2622
free(interfaces_to_take_down);
3188
2623
free(interfaces_hooks);
3189
2624
3190
void clean_dir_at(int base, const char * const dirname,
3191
uintmax_t level){
3192
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){
3206
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
2625
/* Removes the GPGME temp directory and all files inside */
3245
2626
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);
2627
struct dirent **direntries = NULL;
2628
struct dirent *direntry = NULL;
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2630
alphasort);
2631
if(numentries > 0){
2632
for(int i = 0; i < numentries; i++){
2633
direntry = direntries[i];
2634
char *fullname = NULL;
2635
ret = asprintf(&fullname, "%s/%s", tempdir,
2636
direntry->d_name);
2637
if(ret < 0){
2638
perror_plus("asprintf");
2639
continue;
2640
}
2641
ret = remove(fullname);
2642
if(ret == -1){
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2644
strerror(errno));
2645
}
2646
free(fullname);
2647
}
2648
}
2649
2650
/* need to clean even if 0 because man page doesn't specify */
2651
free(direntries);
2652
if(numentries == -1){
2653
perror_plus("scandir");
2654
}
2655
ret = rmdir(tempdir);
2656
if(ret == -1 and errno != ENOENT){
2657
perror_plus("rmdir");
2658
}
3247
2659
}
3248
2660
3249
2661
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0