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- Committer: Teddy Hogeborn
- Date: 2015-07-12 01:41:14 UTC
- Revision ID: teddy@recompile.se-20150712014114-qbala4mutkixxct3
Handle local Zeroconf service name collisions on startup, too.
* mandos (AvahiService.server_state_changed): Catch name collision
error when adding
server.
* mandos (AvahiService.server_state_changed): Catch name collision
error when adding
server.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- dracut-module
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2019 Teddy Hogeborn
13
* Copyright © 2008-2019 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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
*/
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(), unlinkat() */
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,
123
117
gnutls_*
124
118
init_gnutls_session(),
125
119
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
120
#include <gnutls/openpgp.h>
128
121
/* gnutls_certificate_set_openpgp_key_file(),
129
122
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
135
123
136
124
/* GPGME */
137
125
#include <gpgme.h> /* All GPGME types, constants and
145
133
#define PATHDIR "/conf/conf.d/mandos"
146
134
#define SECKEY "seckey.txt"
147
135
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
137
152
138
bool debug = false;
280
266
return true;
281
267
}
282
268
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
335
269
/*
336
270
* Initialize GPGME.
337
271
*/
357
291
return false;
358
292
}
359
293
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
410
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
295
if(rc != GPG_ERR_NO_ERROR){
412
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
420
304
gpgme_strsource(rc), gpgme_strerror(rc));
421
305
return false;
422
306
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
498
307
499
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
309
if(ret == -1){
501
310
perror_plus("close");
502
311
}
541
350
/* Create new GPGME "context" */
542
351
rc = gpgme_new(&(mc->ctx));
543
352
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
546
356
return false;
547
357
}
548
358
584
394
/* Create new empty GPGME data buffer for the plaintext */
585
395
rc = gpgme_data_new(&dh_plain);
586
396
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
588
399
gpgme_strsource(rc), gpgme_strerror(rc));
589
400
gpgme_data_release(dh_crypto);
590
401
return -1;
603
414
if(result == NULL){
604
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
605
416
} else {
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
609
}
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
612
421
if(result->file_name != NULL){
613
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
614
423
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
426
while(recipient != NULL){
618
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
621
431
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
623
435
}
624
436
}
625
437
}
701
513
fprintf_plus(stderr, "GnuTLS: %s", string);
702
514
}
703
515
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
705
517
static int init_gnutls_global(const char *pubkeyfilename,
706
518
const char *seckeyfilename,
707
519
const char *dhparamsfilename,
708
520
mandos_context *mc){
709
521
int ret;
522
unsigned int uret;
710
523
711
524
if(debug){
712
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
713
526
}
714
527
528
ret = gnutls_global_init();
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
532
return -1;
533
}
534
715
535
if(debug){
716
536
/* "Use a log level over 10 to enable all debugging options."
717
537
* - GnuTLS manual
725
545
if(ret != GNUTLS_E_SUCCESS){
726
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
728
549
return -1;
729
550
}
730
551
731
552
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
734
555
pubkeyfilename,
735
556
seckeyfilename);
736
557
}
737
558
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
742
NULL, /* pass */
743
/* key_usage */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
NULL, /* names */
746
0, /* names_length */
747
/* privkey_flags */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
751
559
ret = gnutls_certificate_set_openpgp_key_file
752
560
(mc->cred, pubkeyfilename, seckeyfilename,
753
561
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
562
if(ret != GNUTLS_E_SUCCESS){
758
563
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
760
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
567
safer_gnutls_strerror(ret));
810
615
}
811
616
params.size += (unsigned int)bytes_read;
812
617
}
813
ret = close(dhpfile);
814
if(ret == -1){
815
perror_plus("close");
816
}
817
618
if(params.data == NULL){
818
619
dhparamsfilename = NULL;
819
620
}
828
629
safer_gnutls_strerror(ret));
829
630
dhparamsfilename = NULL;
830
631
}
831
free(params.data);
832
632
} while(false);
833
633
}
834
634
if(dhparamsfilename == NULL){
835
635
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
636
/* Find out the optimal number of DH bits */
838
637
/* Try to read the private key file */
839
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
919
718
}
920
719
}
921
720
}
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
722
if(uret != 0){
924
723
mc->dh_bits = uret;
925
724
if(debug){
937
736
safer_gnutls_strerror(ret));
938
737
goto globalfail;
939
738
}
940
#endif
941
} else { /* dh_bits != 0 */
942
if(debug){
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
944
mc->dh_bits);
945
}
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
951
goto globalfail;
952
}
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
954
749
}
955
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
956
752
957
753
return 0;
958
754
959
755
globalfail:
960
756
961
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
962
759
gnutls_dh_params_deinit(mc->dh_params);
963
760
return -1;
964
761
}
969
766
int ret;
970
767
/* GnuTLS session creation */
971
768
do {
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
974
| GNUTLS_NO_TICKETS
975
#endif
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
978
#endif
979
));
769
ret = gnutls_init(session, GNUTLS_SERVER);
980
770
if(quit_now){
981
771
return -1;
982
772
}
1030
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
821
__attribute__((unused)) const char *txt){}
1032
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
1033
875
/* Helper function to add_local_route() and delete_local_route() */
1034
876
__attribute__((nonnull, warn_unused_result))
1035
877
static bool add_delete_local_route(const bool add,
1089
931
perror_plus("dup2(devnull, STDIN_FILENO)");
1090
932
_exit(EX_OSERR);
1091
933
}
1092
ret = close(devnull);
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1093
935
if(ret == -1){
1094
936
perror_plus("close");
1095
937
_exit(EX_OSERR);
1112
954
helper, O_RDONLY));
1113
955
if(helper_fd == -1){
1114
956
perror_plus("openat");
1115
close(helperdir_fd);
1116
957
_exit(EX_UNAVAILABLE);
1117
958
}
1118
close(helperdir_fd);
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
1119
960
#ifdef __GNUC__
1120
961
#pragma GCC diagnostic push
1121
962
#pragma GCC diagnostic ignored "-Wcast-qual"
1240
1081
bool match = false;
1241
1082
{
1242
1083
char *interface = NULL;
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1246
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1247
1087
match = true;
1248
1088
break;
1290
1130
goto mandos_end;
1291
1131
}
1292
1132
1133
memset(&to, 0, sizeof(to));
1293
1134
if(af == AF_INET6){
1294
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1295
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1296
ret = inet_pton(af, ip, &to6->sin6_addr);
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1297
1137
} else { /* IPv4 */
1298
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1299
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1300
ret = inet_pton(af, ip, &to4->sin_addr);
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1301
1140
}
1302
1141
if(ret < 0 ){
1303
1142
int e = errno;
1382
1221
sizeof(struct sockaddr_in));
1383
1222
}
1384
1223
if(ret < 0){
1385
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1224
if(errno == ENETUNREACH
1386
1225
and if_index != AVAHI_IF_UNSPEC
1387
1226
and connect_to == NULL
1388
1227
and not route_added and
1401
1240
with an explicit route added with the server's address.
1402
1241
1403
1242
Avahi bug reference:
1404
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1405
1244
https://bugs.debian.org/587961
1406
1245
*/
1407
1246
if(debug){
1587
1426
&decrypted_buffer, mc);
1588
1427
if(decrypted_buffer_size >= 0){
1589
1428
1590
clearerr(stdout);
1591
1429
written = 0;
1592
1430
while(written < (size_t) decrypted_buffer_size){
1593
1431
if(quit_now){
1609
1447
}
1610
1448
written += (size_t)ret;
1611
1449
}
1612
ret = fflush(stdout);
1613
if(ret != 0){
1614
int e = errno;
1615
if(debug){
1616
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1617
strerror(errno));
1618
}
1619
errno = e;
1620
goto mandos_end;
1621
}
1622
1450
retval = 0;
1623
1451
}
1624
1452
}
1637
1465
free(decrypted_buffer);
1638
1466
free(buffer);
1639
1467
if(tcp_sd >= 0){
1640
ret = close(tcp_sd);
1468
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1641
1469
}
1642
1470
if(ret == -1){
1643
1471
if(e == 0){
1655
1483
return retval;
1656
1484
}
1657
1485
1486
__attribute__((nonnull))
1658
1487
static void resolve_callback(AvahiSServiceResolver *r,
1659
1488
AvahiIfIndex interface,
1660
1489
AvahiProtocol proto,
1797
1626
__attribute__((nonnull, warn_unused_result))
1798
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1799
1628
int ret;
1800
int old_errno;
1629
error_t ret_errno;
1801
1630
1802
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1803
1632
if(s < 0){
1804
old_errno = errno;
1633
ret_errno = errno;
1805
1634
perror_plus("socket");
1806
errno = old_errno;
1635
errno = ret_errno;
1807
1636
return false;
1808
1637
}
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1638
strcpy(ifr->ifr_name, ifname);
1811
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1812
1640
if(ret == -1){
1813
1641
if(debug){
1814
old_errno = errno;
1642
ret_errno = errno;
1815
1643
perror_plus("ioctl SIOCGIFFLAGS");
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1644
errno = ret_errno;
1822
1645
}
1823
1646
return false;
1824
1647
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1830
1648
return true;
1831
1649
}
1832
1650
2093
1911
return;
2094
1912
}
2095
1913
}
2096
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2097
if(devnull == -1){
2098
perror_plus("open(\"/dev/null\", O_RDONLY)");
2099
return;
2100
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
2101
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2102
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
2103
1926
if(numhooks == -1){
2104
1927
perror_plus("scandir");
2105
close(devnull);
2106
1928
return;
2107
1929
}
2108
1930
struct dirent *direntry;
2109
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
2110
1937
for(int i = 0; i < numhooks; i++){
2111
1938
direntry = direntries[i];
2112
1939
if(debug){
2183
2010
perror_plus("openat");
2184
2011
_exit(EXIT_FAILURE);
2185
2012
}
2186
if(close(hookdir_fd) == -1){
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2187
2014
perror_plus("close");
2188
2015
_exit(EXIT_FAILURE);
2189
2016
}
2192
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2193
2020
_exit(EX_OSERR);
2194
2021
}
2195
ret = close(devnull);
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2196
2023
if(ret == -1){
2197
2024
perror_plus("close");
2198
2025
_exit(EX_OSERR);
2247
2074
free(direntry);
2248
2075
}
2249
2076
free(direntries);
2250
if(close(hookdir_fd) == -1){
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2251
2078
perror_plus("close");
2252
2079
} else {
2253
2080
hookdir_fd = -1;
2256
2083
}
2257
2084
2258
2085
__attribute__((nonnull, warn_unused_result))
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
2086
error_t bring_up_interface(const char *const interface,
2087
const float delay){
2088
error_t old_errno = errno;
2262
2089
int ret;
2263
2090
struct ifreq network;
2264
2091
unsigned int if_index = if_nametoindex(interface);
2274
2101
}
2275
2102
2276
2103
if(not interface_is_up(interface)){
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
2104
error_t ret_errno = 0, ioctl_errno = 0;
2279
2105
if(not get_flags(interface, &network)){
2280
2106
ret_errno = errno;
2281
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2294
2120
}
2295
2121
2296
2122
if(quit_now){
2297
ret = close(sd);
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2298
2124
if(ret == -1){
2299
2125
perror_plus("close");
2300
2126
}
2350
2176
}
2351
2177
2352
2178
/* Close the socket */
2353
ret = close(sd);
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2354
2180
if(ret == -1){
2355
2181
perror_plus("close");
2356
2182
}
2368
2194
2369
2195
/* Sleep checking until interface is running.
2370
2196
Check every 0.25s, up to total time of delay */
2371
for(int i = 0; i < delay * 4; i++){
2197
for(int i=0; i < delay * 4; i++){
2372
2198
if(interface_is_running(interface)){
2373
2199
break;
2374
2200
}
2384
2210
}
2385
2211
2386
2212
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
2213
error_t take_down_interface(const char *const interface){
2214
error_t old_errno = errno;
2389
2215
struct ifreq network;
2390
2216
unsigned int if_index = if_nametoindex(interface);
2391
2217
if(if_index == 0){
2394
2220
return ENXIO;
2395
2221
}
2396
2222
if(interface_is_up(interface)){
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
2223
error_t ret_errno = 0, ioctl_errno = 0;
2399
2224
if(not get_flags(interface, &network) and debug){
2400
2225
ret_errno = errno;
2401
2226
fprintf_plus(stderr, "Failed to get flags for interface "
2439
2264
}
2440
2265
2441
2266
/* Close the socket */
2442
int ret = close(sd);
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2443
2268
if(ret == -1){
2444
2269
perror_plus("close");
2445
2270
}
2461
2286
2462
2287
int main(int argc, char *argv[]){
2463
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2464
#if GNUTLS_VERSION_NUMBER >= 0x030606
2465
.priority = "SECURE128:!CTYPE-X.509"
2466
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2467
":%PROFILE_ULTRA",
2468
#elif GNUTLS_VERSION_NUMBER < 0x030600
2469
.priority = "SECURE256:!CTYPE-X.509"
2470
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2471
#else
2472
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2473
#endif
2474
.current_server = NULL, .interfaces = NULL,
2475
.interfaces_size = 0 };
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
2476
2292
AvahiSServiceBrowser *sb = NULL;
2477
2293
error_t ret_errno;
2478
2294
int ret;
2487
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2488
2304
const char *seckey = PATHDIR "/" SECKEY;
2489
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2490
#if GNUTLS_VERSION_NUMBER >= 0x030606
2491
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2492
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2493
#endif
2494
2306
const char *dh_params_file = NULL;
2495
2307
char *interfaces_hooks = NULL;
2496
2308
2544
2356
{ .name = "pubkey", .key = 'p',
2545
2357
.arg = "FILE",
2546
2358
.doc = "OpenPGP public key file base name",
2547
.group = 1 },
2548
{ .name = "tls-privkey", .key = 't',
2549
.arg = "FILE",
2550
#if GNUTLS_VERSION_NUMBER >= 0x030606
2551
.doc = "TLS private key file base name",
2552
#else
2553
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2554
#endif
2555
.group = 1 },
2556
{ .name = "tls-pubkey", .key = 'T',
2557
.arg = "FILE",
2558
#if GNUTLS_VERSION_NUMBER >= 0x030606
2559
.doc = "TLS public key file base name",
2560
#else
2561
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2562
#endif
2563
.group = 1 },
2359
.group = 2 },
2564
2360
{ .name = "dh-bits", .key = 129,
2565
2361
.arg = "BITS",
2566
2362
.doc = "Bit length of the prime number used in the"
2622
2418
case 'p': /* --pubkey */
2623
2419
pubkey = arg;
2624
2420
break;
2625
case 't': /* --tls-privkey */
2626
#if GNUTLS_VERSION_NUMBER >= 0x030606
2627
tls_privkey = arg;
2628
#endif
2629
break;
2630
case 'T': /* --tls-pubkey */
2631
#if GNUTLS_VERSION_NUMBER >= 0x030606
2632
tls_pubkey = arg;
2633
#endif
2634
break;
2635
2421
case 129: /* --dh-bits */
2636
2422
errno = 0;
2637
2423
tmpmax = strtoimax(arg, &tmp, 10);
2672
2458
argp_state_help(state, state->out_stream,
2673
2459
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2674
2460
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
__builtin_unreachable();
2676
2461
case -3: /* --usage */
2677
2462
argp_state_help(state, state->out_stream,
2678
2463
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2679
__builtin_unreachable();
2680
2464
case 'V': /* --version */
2681
2465
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2682
2466
exit(argp_err_exit_status);
2691
2475
.args_doc = "",
2692
2476
.doc = "Mandos client -- Get and decrypt"
2693
2477
" passwords from a Mandos server" };
2694
ret_errno = argp_parse(&argp, argc, argv,
2695
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2696
switch(ret_errno){
2478
ret = argp_parse(&argp, argc, argv,
2479
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2480
switch(ret){
2697
2481
case 0:
2698
2482
break;
2699
2483
case ENOMEM:
2700
2484
default:
2701
errno = ret_errno;
2485
errno = ret;
2702
2486
perror_plus("argp_parse");
2703
2487
exitcode = EX_OSERR;
2704
2488
goto end;
2710
2494
2711
2495
{
2712
2496
/* Work around Debian bug #633582:
2713
<https://bugs.debian.org/633582> */
2497
<http://bugs.debian.org/633582> */
2714
2498
2715
2499
/* Re-raise privileges */
2716
ret = raise_privileges();
2717
if(ret != 0){
2718
errno = ret;
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2719
2503
perror_plus("Failed to raise privileges");
2720
2504
} else {
2721
2505
struct stat st;
2737
2521
}
2738
2522
}
2739
2523
}
2740
close(seckey_fd);
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
2741
2525
}
2742
2526
}
2743
2527
2758
2542
}
2759
2543
}
2760
2544
}
2761
close(pubkey_fd);
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
2762
2546
}
2763
2547
}
2764
2548
2765
if(dh_params_file != NULL
2766
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2549
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2767
2550
int dhparams_fd = open(dh_params_file, O_RDONLY);
2768
2551
if(dhparams_fd == -1){
2769
2552
perror_plus("open");
2780
2563
}
2781
2564
}
2782
2565
}
2783
close(dhparams_fd);
2566
TEMP_FAILURE_RETRY(close(dhparams_fd));
2784
2567
}
2785
2568
}
2786
2569
2787
2570
/* Lower privileges */
2788
ret = lower_privileges();
2789
if(ret != 0){
2790
errno = ret;
2571
ret_errno = lower_privileges();
2572
if(ret_errno != 0){
2573
errno = ret_errno;
2791
2574
perror_plus("Failed to lower privileges");
2792
2575
}
2793
2576
}
2993
2776
goto end;
2994
2777
}
2995
2778
2996
#if GNUTLS_VERSION_NUMBER >= 0x030606
2997
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
2998
#elif GNUTLS_VERSION_NUMBER < 0x030600
2999
2779
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3000
#else
3001
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3002
#endif
3003
2780
if(ret == -1){
3004
2781
fprintf_plus(stderr, "init_gnutls_global failed\n");
3005
2782
exitcode = EX_UNAVAILABLE;
3127
2904
3128
2905
/* Allocate a new server */
3129
2906
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3130
&config, NULL, NULL, &ret);
2907
&config, NULL, NULL, &ret_errno);
3131
2908
3132
2909
/* Free the Avahi configuration data */
3133
2910
avahi_server_config_free(&config);
3136
2913
/* Check if creating the Avahi server object succeeded */
3137
2914
if(mc.server == NULL){
3138
2915
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3139
avahi_strerror(ret));
2916
avahi_strerror(ret_errno));
3140
2917
exitcode = EX_UNAVAILABLE;
3141
2918
goto end;
3142
2919
}
3177
2954
end:
3178
2955
3179
2956
if(debug){
3180
if(signal_received){
3181
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3182
argv[0], signal_received,
3183
strsignal(signal_received));
3184
} else {
3185
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3186
}
2957
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
2958
}
3188
2959
3189
2960
/* Cleanup things */
3200
2971
3201
2972
if(gnutls_initialized){
3202
2973
gnutls_certificate_free_credentials(mc.cred);
2974
gnutls_global_deinit();
3203
2975
gnutls_dh_params_deinit(mc.dh_params);
3204
2976
}
3205
2977
3228
3000
3229
3001
/* Re-raise privileges */
3230
3002
{
3231
ret = raise_privileges();
3232
if(ret != 0){
3233
errno = ret;
3003
ret_errno = raise_privileges();
3004
if(ret_errno != 0){
3005
errno = ret_errno;
3234
3006
perror_plus("Failed to raise privileges");
3235
3007
} else {
3236
3008
3241
3013
/* Take down the network interfaces which were brought up */
3242
3014
{
3243
3015
char *interface = NULL;
3244
while((interface = argz_next(interfaces_to_take_down,
3245
interfaces_to_take_down_size,
3246
interface))){
3247
ret = take_down_interface(interface);
3248
if(ret != 0){
3249
errno = ret;
3016
while((interface=argz_next(interfaces_to_take_down,
3017
interfaces_to_take_down_size,
3018
interface))){
3019
ret_errno = take_down_interface(interface);
3020
if(ret_errno != 0){
3021
errno = ret_errno;
3250
3022
perror_plus("Failed to take down interface");
3251
3023
}
3252
3024
}
3257
3029
}
3258
3030
}
3259
3031
3260
ret = lower_privileges_permanently();
3261
if(ret != 0){
3262
errno = ret;
3032
ret_errno = lower_privileges_permanently();
3033
if(ret_errno != 0){
3034
errno = ret_errno;
3263
3035
perror_plus("Failed to lower privileges permanently");
3264
3036
}
3265
3037
}
3267
3039
free(interfaces_to_take_down);
3268
3040
free(interfaces_hooks);
3269
3041
3270
void clean_dir_at(int base, const char * const dirname,
3271
uintmax_t level){
3272
struct dirent **direntries = NULL;
3273
int dret;
3274
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3275
O_RDONLY
3276
| O_NOFOLLOW
3277
| O_DIRECTORY
3278
| O_PATH));
3279
if(dir_fd == -1){
3280
perror_plus("open");
3281
return;
3282
}
3283
int numentries = scandirat(dir_fd, ".", &direntries,
3284
notdotentries, alphasort);
3285
if(numentries >= 0){
3286
for(int i = 0; i < numentries; i++){
3287
if(debug){
3288
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3289
dirname, direntries[i]->d_name);
3290
}
3291
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3292
if(dret == -1){
3293
if(errno == EISDIR){
3294
dret = unlinkat(dir_fd, direntries[i]->d_name,
3295
AT_REMOVEDIR);
3296
}
3297
if((dret == -1) and (errno == ENOTEMPTY)
3298
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3299
== 0) and (level == 0)){
3300
/* Recurse only in this special case */
3301
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3302
dret = 0;
3303
}
3304
if((dret == -1) and (errno != ENOENT)){
3305
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3306
direntries[i]->d_name, strerror(errno));
3307
}
3308
}
3309
free(direntries[i]);
3310
}
3311
3312
/* need to clean even if 0 because man page doesn't specify */
3313
free(direntries);
3314
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3315
if(dret == -1 and errno != ENOENT){
3316
perror_plus("rmdir");
3317
}
3318
} else {
3319
perror_plus("scandirat");
3320
}
3321
close(dir_fd);
3322
}
3323
3324
3042
/* Removes the GPGME temp directory and all files inside */
3325
3043
if(tempdir != NULL){
3326
clean_dir_at(-1, tempdir, 0);
3044
struct dirent **direntries = NULL;
3045
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3046
| O_NOFOLLOW
3047
| O_DIRECTORY
3048
| O_PATH));
3049
if(tempdir_fd == -1){
3050
perror_plus("open");
3051
} else {
3052
#ifdef __GLIBC__
3053
#if __GLIBC_PREREQ(2, 15)
3054
int numentries = scandirat(tempdir_fd, ".", &direntries,
3055
notdotentries, alphasort);
3056
#else /* not __GLIBC_PREREQ(2, 15) */
3057
int numentries = scandir(tempdir, &direntries, notdotentries,
3058
alphasort);
3059
#endif /* not __GLIBC_PREREQ(2, 15) */
3060
#else /* not __GLIBC__ */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC__ */
3064
if(numentries >= 0){
3065
for(int i = 0; i < numentries; i++){
3066
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3067
if(ret == -1){
3068
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3069
" \"%s\", 0): %s\n", tempdir,
3070
direntries[i]->d_name, strerror(errno));
3071
}
3072
free(direntries[i]);
3073
}
3074
3075
/* need to clean even if 0 because man page doesn't specify */
3076
free(direntries);
3077
if(numentries == -1){
3078
perror_plus("scandir");
3079
}
3080
ret = rmdir(tempdir);
3081
if(ret == -1 and errno != ENOENT){
3082
perror_plus("rmdir");
3083
}
3084
}
3085
TEMP_FAILURE_RETRY(close(tempdir_fd));
3086
}
3327
3087
}
3328
3088
3329
3089
if(quit_now){
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Version: 2.0.2.dev0