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- Committer: Teddy Hogeborn
- Date: 2018-10-14 14:08:48 UTC
- Revision ID: teddy@recompile.se-20181014140848-he0rvcg2eksca1yh
Update Debian package standard-version to "4.2.1"
* debian/control (Standards-Version): Update to "4.2.1".
* debian/control (Standards-Version): Update to "4.2.1".
- files added:
- bugs.xml
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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 © 2008-2013 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
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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
stdout, ferror() */
44
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
60
inet_pton(), connect(),
59
61
getnameinfo() */
60
#include <fcntl.h> /* open() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
64
*/
63
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
66
strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
77
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
136
143
137
144
bool debug = false;
138
145
static const char mandos_protocol_version[] = "1";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
146
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
148
static const char sys_class_net[] = "/sys/class/net";
142
149
char *connect_to = NULL;
143
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
144
152
uid_t uid = 65534;
145
153
gid_t gid = 65534;
146
154
232
240
.af = af };
233
241
if(new_server->ip == NULL){
234
242
perror_plus("strdup");
243
free(new_server);
235
244
return false;
236
245
}
237
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
247
if(ret == -1){
239
248
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);
240
258
return false;
241
259
}
242
260
/* Special case of first server */
254
272
return true;
255
273
}
256
274
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
257
327
/*
258
328
* Initialize GPGME.
259
329
*/
279
349
return false;
280
350
}
281
351
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
282
402
rc = gpgme_data_new_from_fd(&pgp_data, fd);
283
403
if(rc != GPG_ERR_NO_ERROR){
284
404
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
292
412
gpgme_strsource(rc), gpgme_strerror(rc));
293
413
return false;
294
414
}
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
}
295
490
296
ret = (int)TEMP_FAILURE_RETRY(close(fd));
491
ret = close(fd);
297
492
if(ret == -1){
298
493
perror_plus("close");
299
494
}
338
533
/* Create new GPGME "context" */
339
534
rc = gpgme_new(&(mc->ctx));
340
535
if(rc != GPG_ERR_NO_ERROR){
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
344
538
return false;
345
539
}
346
540
382
576
/* Create new empty GPGME data buffer for the plaintext */
383
577
rc = gpgme_data_new(&dh_plain);
384
578
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
387
580
gpgme_strsource(rc), gpgme_strerror(rc));
388
581
gpgme_data_release(dh_crypto);
389
582
return -1;
402
595
if(result == NULL){
403
596
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
404
597
} else {
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
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");
409
604
if(result->file_name != NULL){
410
605
fprintf_plus(stderr, "File name: %s\n", result->file_name);
411
606
}
412
gpgme_recipient_t recipient;
413
recipient = result->recipients;
414
while(recipient != NULL){
607
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
609
r = r->next){
415
610
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
611
gpgme_pubkey_algo_name(r->pubkey_algo));
612
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
419
613
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
422
recipient = recipient->next;
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
423
615
}
424
616
}
425
617
}
481
673
return plaintext_length;
482
674
}
483
675
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
484
683
__attribute__((warn_unused_result))
485
684
static const char *safer_gnutls_strerror(int value){
486
685
const char *ret = gnutls_strerror(value);
487
if(ret == NULL)
488
ret = "(unknown)";
489
return ret;
686
return safe_string(ret);
490
687
}
491
688
492
689
/* GnuTLS log function callback */
496
693
fprintf_plus(stderr, "GnuTLS: %s", string);
497
694
}
498
695
499
__attribute__((nonnull, warn_unused_result))
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
697
static int init_gnutls_global(const char *pubkeyfilename,
501
698
const char *seckeyfilename,
699
const char *dhparamsfilename,
502
700
mandos_context *mc){
503
701
int ret;
702
unsigned int uret;
504
703
505
704
if(debug){
506
705
fprintf_plus(stderr, "Initializing GnuTLS\n");
507
706
}
508
707
509
ret = gnutls_global_init();
510
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
513
return -1;
514
}
515
516
708
if(debug){
517
709
/* "Use a log level over 10 to enable all debugging options."
518
710
* - GnuTLS manual
526
718
if(ret != GNUTLS_E_SUCCESS){
527
719
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
720
safer_gnutls_strerror(ret));
529
gnutls_global_deinit();
530
721
return -1;
531
722
}
532
723
557
748
safer_gnutls_strerror(ret));
558
749
goto globalfail;
559
750
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
561
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
564
goto globalfail;
565
}
566
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
}
567
928
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
568
929
569
930
return 0;
571
932
globalfail:
572
933
573
934
gnutls_certificate_free_credentials(mc->cred);
574
gnutls_global_deinit();
575
935
gnutls_dh_params_deinit(mc->dh_params);
576
936
return -1;
577
937
}
629
989
/* ignore client certificate if any. */
630
990
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
991
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
633
634
992
return 0;
635
993
}
636
994
638
996
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
639
997
__attribute__((unused)) const char *txt){}
640
998
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
641
1165
/* Called when a Mandos server is found */
642
1166
__attribute__((nonnull, warn_unused_result))
643
1167
static int start_mandos_communication(const char *ip, in_port_t port,
654
1178
int retval = -1;
655
1179
gnutls_session_t session;
656
1180
int pf; /* Protocol family */
1181
bool route_added = false;
657
1182
658
1183
errno = 0;
659
1184
681
1206
bool match = false;
682
1207
{
683
1208
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1211
interface))){
686
1212
if(if_nametoindex(interface) == (unsigned int)if_index){
687
1213
match = true;
688
1214
break;
717
1243
PRIuMAX "\n", ip, (uintmax_t)port);
718
1244
}
719
1245
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
1247
if(tcp_sd < 0){
722
1248
int e = errno;
723
1249
perror_plus("socket");
730
1256
goto mandos_end;
731
1257
}
732
1258
733
memset(&to, 0, sizeof(to));
734
1259
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
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);
737
1263
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
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);
740
1267
}
741
1268
if(ret < 0 ){
742
1269
int e = errno;
812
1339
goto mandos_end;
813
1340
}
814
1341
815
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
818
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
821
}
822
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
int e = errno;
825
perror_plus("connect");
826
errno = e;
827
}
828
goto mandos_end;
829
}
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
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;
834
1397
}
835
1398
836
1399
const char *out = mandos_protocol_version;
990
1553
&decrypted_buffer, mc);
991
1554
if(decrypted_buffer_size >= 0){
992
1555
1556
clearerr(stdout);
993
1557
written = 0;
994
1558
while(written < (size_t) decrypted_buffer_size){
995
1559
if(quit_now){
1011
1575
}
1012
1576
written += (size_t)ret;
1013
1577
}
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
}
1014
1588
retval = 0;
1015
1589
}
1016
1590
}
1019
1593
1020
1594
mandos_end:
1021
1595
{
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
}
1022
1602
int e = errno;
1023
1603
free(decrypted_buffer);
1024
1604
free(buffer);
1025
1605
if(tcp_sd >= 0){
1026
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1606
ret = close(tcp_sd);
1027
1607
}
1028
1608
if(ret == -1){
1029
1609
if(e == 0){
1041
1621
return retval;
1042
1622
}
1043
1623
1044
__attribute__((nonnull))
1045
1624
static void resolve_callback(AvahiSServiceResolver *r,
1046
1625
AvahiIfIndex interface,
1047
1626
AvahiProtocol proto,
1064
1643
timed out */
1065
1644
1066
1645
if(quit_now){
1646
avahi_s_service_resolver_free(r);
1067
1647
return;
1068
1648
}
1069
1649
1183
1763
__attribute__((nonnull, warn_unused_result))
1184
1764
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
1765
int ret;
1186
error_t ret_errno;
1766
int old_errno;
1187
1767
1188
1768
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
1769
if(s < 0){
1190
ret_errno = errno;
1770
old_errno = errno;
1191
1771
perror_plus("socket");
1192
errno = ret_errno;
1772
errno = old_errno;
1193
1773
return false;
1194
1774
}
1195
strcpy(ifr->ifr_name, ifname);
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
1777
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
1778
if(ret == -1){
1198
1779
if(debug){
1199
ret_errno = errno;
1780
old_errno = errno;
1200
1781
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
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
1788
}
1203
1789
return false;
1204
1790
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1205
1796
return true;
1206
1797
}
1207
1798
1335
1926
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
1927
"abcdefghijklmnopqrstuvwxyz"
1337
1928
"0123456789"
1338
"_-");
1929
"_.-");
1339
1930
if((direntry->d_name)[sret] != '\0'){
1340
1931
/* Contains non-allowed characters */
1341
1932
if(debug){
1345
1936
return 0;
1346
1937
}
1347
1938
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1939
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1356
1940
if(ret == -1){
1357
1941
if(debug){
1358
1942
perror_plus("Could not stat hook");
1456
2040
}
1457
2041
}
1458
2042
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
2043
__attribute__((nonnull))
1516
2044
void run_network_hooks(const char *mode, const char *interface,
1517
2045
const float delay){
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
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);
1521
2069
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
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);
1529
2081
}
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
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){
1539
2128
perror_plus("asprintf");
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
2129
_exit(EX_OSERR);
2130
}
2131
ret = setenv("DELAY", delaystring, 1);
2132
if(ret == -1){
1615
2133
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
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;
1627
2202
} else {
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
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);
1663
2222
}
1664
2223
1665
2224
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
2225
int bring_up_interface(const char *const interface,
2226
const float delay){
2227
int old_errno = errno;
1669
2228
int ret;
1670
2229
struct ifreq network;
1671
2230
unsigned int if_index = if_nametoindex(interface);
1681
2240
}
1682
2241
1683
2242
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
1685
2245
if(not get_flags(interface, &network)){
1686
2246
ret_errno = errno;
1687
2247
fprintf_plus(stderr, "Failed to get flags for interface "
1700
2260
}
1701
2261
1702
2262
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2263
ret = close(sd);
1704
2264
if(ret == -1){
1705
2265
perror_plus("close");
1706
2266
}
1715
2275
1716
2276
/* Raise privileges */
1717
2277
ret_errno = raise_privileges();
2278
if(ret_errno != 0){
2279
errno = ret_errno;
2280
perror_plus("Failed to raise privileges");
2281
}
2282
2283
#ifdef __linux__
2284
int ret_linux;
1718
2285
bool restore_loglevel = false;
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
#ifdef __linux__
1723
int ret_linux;
1724
2286
if(ret_errno == 0){
1725
2287
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
2288
messages about the network interface to mess up the prompt */
1754
2316
}
1755
2317
1756
2318
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2319
ret = close(sd);
1758
2320
if(ret == -1){
1759
2321
perror_plus("close");
1760
2322
}
1772
2334
1773
2335
/* Sleep checking until interface is running.
1774
2336
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
2337
for(int i = 0; i < delay * 4; i++){
1776
2338
if(interface_is_running(interface)){
1777
2339
break;
1778
2340
}
1788
2350
}
1789
2351
1790
2352
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
1793
2355
struct ifreq network;
1794
2356
unsigned int if_index = if_nametoindex(interface);
1795
2357
if(if_index == 0){
1798
2360
return ENXIO;
1799
2361
}
1800
2362
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
2363
int ret_errno = 0;
2364
int ioctl_errno = 0;
1802
2365
if(not get_flags(interface, &network) and debug){
1803
2366
ret_errno = errno;
1804
2367
fprintf_plus(stderr, "Failed to get flags for interface "
1824
2387
/* Raise privileges */
1825
2388
ret_errno = raise_privileges();
1826
2389
if(ret_errno != 0){
2390
errno = ret_errno;
1827
2391
perror_plus("Failed to raise privileges");
1828
2392
}
2393
1829
2394
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
2395
ioctl_errno = errno;
1831
2396
1840
2405
}
1841
2406
1842
2407
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2408
int ret = close(sd);
1844
2409
if(ret == -1){
1845
2410
perror_plus("close");
1846
2411
}
1861
2426
}
1862
2427
1863
2428
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
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 };
1868
2434
AvahiSServiceBrowser *sb = NULL;
1869
2435
error_t ret_errno;
1870
2436
int ret;
1879
2445
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1880
2446
const char *seckey = PATHDIR "/" SECKEY;
1881
2447
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
1882
2449
char *interfaces_hooks = NULL;
1883
2450
1884
2451
bool gnutls_initialized = false;
1937
2504
.doc = "Bit length of the prime number used in the"
1938
2505
" Diffie-Hellman key exchange",
1939
2506
.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 },
1940
2512
{ .name = "priority", .key = 130,
1941
2513
.arg = "STRING",
1942
2514
.doc = "GnuTLS priority string for the TLS handshake",
1997
2569
}
1998
2570
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1999
2571
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
2000
2575
case 130: /* --priority */
2001
2576
mc.priority = arg;
2002
2577
break;
2042
2617
.args_doc = "",
2043
2618
.doc = "Mandos client -- Get and decrypt"
2044
2619
" passwords from a Mandos server" };
2045
ret = argp_parse(&argp, argc, argv,
2046
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2047
switch(ret){
2620
ret_errno = argp_parse(&argp, argc, argv,
2621
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2622
switch(ret_errno){
2048
2623
case 0:
2049
2624
break;
2050
2625
case ENOMEM:
2051
2626
default:
2052
errno = ret;
2627
errno = ret_errno;
2053
2628
perror_plus("argp_parse");
2054
2629
exitcode = EX_OSERR;
2055
2630
goto end;
2058
2633
goto end;
2059
2634
}
2060
2635
}
2061
2636
2062
2637
{
2063
2638
/* Work around Debian bug #633582:
2064
<http://bugs.debian.org/633582> */
2639
<https://bugs.debian.org/633582> */
2065
2640
2066
2641
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2642
ret = raise_privileges();
2643
if(ret != 0){
2644
errno = ret;
2070
2645
perror_plus("Failed to raise privileges");
2071
2646
} else {
2072
2647
struct stat st;
2088
2663
}
2089
2664
}
2090
2665
}
2091
TEMP_FAILURE_RETRY(close(seckey_fd));
2666
close(seckey_fd);
2092
2667
}
2093
2668
}
2094
2669
2095
2670
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2096
2671
int pubkey_fd = open(pubkey, O_RDONLY);
2097
2672
if(pubkey_fd == -1){
2109
2684
}
2110
2685
}
2111
2686
}
2112
TEMP_FAILURE_RETRY(close(pubkey_fd));
2113
}
2114
}
2115
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
2116
2713
/* Lower privileges */
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2714
ret = lower_privileges();
2715
if(ret != 0){
2716
errno = ret;
2120
2717
perror_plus("Failed to lower privileges");
2121
2718
}
2122
2719
}
2235
2832
2236
2833
/* If no interfaces were specified, make a list */
2237
2834
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2835
struct dirent **direntries = NULL;
2239
2836
/* Look for any good interfaces */
2240
2837
ret = scandir(sys_class_net, &direntries, good_interface,
2241
2838
alphasort);
2247
2844
if(ret_errno != 0){
2248
2845
errno = ret_errno;
2249
2846
perror_plus("argz_add");
2847
free(direntries[i]);
2250
2848
continue;
2251
2849
}
2252
2850
if(debug){
2253
2851
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
2852
direntries[i]->d_name);
2255
2853
}
2854
free(direntries[i]);
2256
2855
}
2257
2856
free(direntries);
2258
2857
} else {
2259
free(direntries);
2858
if(ret == 0){
2859
free(direntries);
2860
}
2260
2861
fprintf_plus(stderr, "Could not find a network interface\n");
2261
2862
exitcode = EXIT_FAILURE;
2262
2863
goto end;
2288
2889
errno = bring_up_interface(interface, delay);
2289
2890
if(not interface_was_up){
2290
2891
if(errno != 0){
2291
perror_plus("Failed to bring up interface");
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2292
2894
} else {
2293
2895
errno = argz_add(&interfaces_to_take_down,
2294
2896
&interfaces_to_take_down_size,
2317
2919
goto end;
2318
2920
}
2319
2921
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2321
2923
if(ret == -1){
2322
2924
fprintf_plus(stderr, "init_gnutls_global failed\n");
2323
2925
exitcode = EX_UNAVAILABLE;
2445
3047
2446
3048
/* Allocate a new server */
2447
3049
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2448
&config, NULL, NULL, &ret_errno);
3050
&config, NULL, NULL, &ret);
2449
3051
2450
3052
/* Free the Avahi configuration data */
2451
3053
avahi_server_config_free(&config);
2454
3056
/* Check if creating the Avahi server object succeeded */
2455
3057
if(mc.server == NULL){
2456
3058
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2457
avahi_strerror(ret_errno));
3059
avahi_strerror(ret));
2458
3060
exitcode = EX_UNAVAILABLE;
2459
3061
goto end;
2460
3062
}
2484
3086
if(debug){
2485
3087
fprintf_plus(stderr, "Starting Avahi loop search\n");
2486
3088
}
2487
3089
2488
3090
ret = avahi_loop_with_timeout(simple_poll,
2489
3091
(int)(retry_interval * 1000), &mc);
2490
3092
if(debug){
2495
3097
end:
2496
3098
2497
3099
if(debug){
2498
fprintf_plus(stderr, "%s exiting\n", argv[0]);
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
}
2499
3107
}
2500
3108
2501
3109
/* Cleanup things */
2512
3120
2513
3121
if(gnutls_initialized){
2514
3122
gnutls_certificate_free_credentials(mc.cred);
2515
gnutls_global_deinit();
2516
3123
gnutls_dh_params_deinit(mc.dh_params);
2517
3124
}
2518
3125
2526
3133
mc.current_server->prev->next = NULL;
2527
3134
while(mc.current_server != NULL){
2528
3135
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
2529
3144
free(mc.current_server);
2530
3145
mc.current_server = next;
2531
3146
}
2533
3148
2534
3149
/* Re-raise privileges */
2535
3150
{
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
3151
ret = raise_privileges();
3152
if(ret != 0){
3153
errno = ret;
2538
3154
perror_plus("Failed to raise privileges");
2539
3155
} else {
2540
3156
2545
3161
/* Take down the network interfaces which were brought up */
2546
3162
{
2547
3163
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
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;
2554
3170
perror_plus("Failed to take down interface");
2555
3171
}
2556
3172
}
2560
3176
}
2561
3177
}
2562
3178
}
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
3179
3180
ret = lower_privileges_permanently();
3181
if(ret != 0){
3182
errno = ret;
2565
3183
perror_plus("Failed to lower privileges permanently");
2566
3184
}
2567
3185
}
2569
3187
free(interfaces_to_take_down);
2570
3188
free(interfaces_hooks);
2571
3189
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
2572
3244
/* Removes the GPGME temp directory and all files inside */
2573
3245
if(tempdir != NULL){
2574
struct dirent **direntries = NULL;
2575
struct dirent *direntry = NULL;
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2577
alphasort);
2578
if(numentries > 0){
2579
for(int i = 0; i < numentries; i++){
2580
direntry = direntries[i];
2581
char *fullname = NULL;
2582
ret = asprintf(&fullname, "%s/%s", tempdir,
2583
direntry->d_name);
2584
if(ret < 0){
2585
perror_plus("asprintf");
2586
continue;
2587
}
2588
ret = remove(fullname);
2589
if(ret == -1){
2590
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2591
strerror(errno));
2592
}
2593
free(fullname);
2594
}
2595
}
2596
2597
/* need to clean even if 0 because man page doesn't specify */
2598
free(direntries);
2599
if(numentries == -1){
2600
perror_plus("scandir");
2601
}
2602
ret = rmdir(tempdir);
2603
if(ret == -1 and errno != ENOENT){
2604
perror_plus("rmdir");
2605
}
3246
clean_dir_at(-1, tempdir, 0);
2606
3247
}
2607
3248
2608
3249
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0