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- Committer: Teddy Hogeborn
- Date: 2015-07-02 18:22:22 UTC
- mto: This revision was merged to the branch mainline in revision 759.
- Revision ID: teddy@recompile.se-20150702182222-034v03mb8orwhezn
mandos-client: Minor changes to check for more error conditions.
* mandos-client.c (add_remove_local_route): Do TEMP_FAILURE_RETRY
around closing of
/dev/null. Check return
value when opening helper
directory and helper
executable.
(run_network_hooks): Cast return value of TEMP_FAILURE_RETRY to int.
Do TEMP_FAILURE_RETRY around closing of
/dev/null.
* mandos-client.c (add_remove_local_route): Do TEMP_FAILURE_RETRY
around closing of
/dev/null. Check return
value when opening helper
directory and helper
executable.
(run_network_hooks): Cast return value of TEMP_FAILURE_RETRY to int.
Do TEMP_FAILURE_RETRY around closing of
/dev/null.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2015 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,
311
305
return false;
312
306
}
313
307
314
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
309
if(ret == -1){
316
310
perror_plus("close");
317
311
}
420
414
if(result == NULL){
421
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
416
} else {
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
427
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
428
420
result->wrong_key_usage);
429
421
if(result->file_name != NULL){
501
493
return plaintext_length;
502
494
}
503
495
504
__attribute__((warn_unused_result, const))
505
static const char *safe_string(const char *str){
506
if(str == NULL)
507
return "(unknown)";
508
return str;
509
}
510
511
496
__attribute__((warn_unused_result))
512
497
static const char *safer_gnutls_strerror(int value){
513
498
const char *ret = gnutls_strerror(value);
514
return safe_string(ret);
499
if(ret == NULL)
500
ret = "(unknown)";
501
return ret;
515
502
}
516
503
517
504
/* GnuTLS log function callback */
521
508
fprintf_plus(stderr, "GnuTLS: %s", string);
522
509
}
523
510
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
511
__attribute__((nonnull, warn_unused_result))
525
512
static int init_gnutls_global(const char *pubkeyfilename,
526
513
const char *seckeyfilename,
527
const char *dhparamsfilename,
528
514
mandos_context *mc){
529
515
int ret;
530
unsigned int uret;
531
516
532
517
if(debug){
533
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
534
519
}
535
520
521
ret = gnutls_global_init();
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
525
return -1;
526
}
527
536
528
if(debug){
537
529
/* "Use a log level over 10 to enable all debugging options."
538
530
* - GnuTLS manual
546
538
if(ret != GNUTLS_E_SUCCESS){
547
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
540
safer_gnutls_strerror(ret));
541
gnutls_global_deinit();
549
542
return -1;
550
543
}
551
544
576
569
safer_gnutls_strerror(ret));
577
570
goto globalfail;
578
571
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
624
}
625
if(dhparamsfilename == NULL){
626
break;
627
}
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
635
}
636
free(params.data);
637
} while(false);
638
}
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
644
do {
645
int secfile = open(seckeyfilename, O_RDONLY);
646
if(secfile == -1){
647
perror_plus("open");
648
break;
649
}
650
size_t buffer_capacity = 0;
651
while(true){
652
buffer_capacity = incbuffer((char **)&buffer.data,
653
(size_t)buffer.size,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
657
free(buffer.data);
658
buffer.data = NULL;
659
break;
660
}
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
663
BUFFER_SIZE);
664
/* EOF */
665
if(bytes_read == 0){
666
break;
667
}
668
/* check bytes_read for failure */
669
if(bytes_read < 0){
670
perror_plus("read");
671
free(buffer.data);
672
buffer.data = NULL;
673
break;
674
}
675
buffer.size += (unsigned int)bytes_read;
676
}
677
close(secfile);
678
} while(false);
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
682
{
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
687
" structure: %s",
688
safer_gnutls_strerror(ret));
689
free(buffer.data);
690
buffer.data = NULL;
691
} else {
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
697
privkey = NULL;
698
}
699
free(buffer.data);
700
buffer.data = NULL;
701
if(privkey != NULL){
702
/* Use private key to suggest an appropriate
703
sec_param */
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
706
if(debug){
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
710
(sec_param)));
711
}
712
}
713
}
714
}
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
718
if(debug){
719
fprintf_plus(stderr, "Falling back to security parameter"
720
" \"%s\"\n",
721
safe_string(gnutls_sec_param_get_name
722
(sec_param)));
723
}
724
}
725
}
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
727
if(uret != 0){
728
mc->dh_bits = uret;
729
if(debug){
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
mc->dh_bits);
735
}
736
} else {
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
740
(sec_param)),
741
safer_gnutls_strerror(ret));
742
goto globalfail;
743
}
744
} else if(debug){
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
mc->dh_bits);
747
}
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
753
goto globalfail;
754
}
755
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
576
goto globalfail;
577
}
578
756
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
757
580
758
581
return 0;
760
583
globalfail:
761
584
762
585
gnutls_certificate_free_credentials(mc->cred);
586
gnutls_global_deinit();
763
587
gnutls_dh_params_deinit(mc->dh_params);
764
588
return -1;
765
589
}
817
641
/* ignore client certificate if any. */
818
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
819
643
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
820
646
return 0;
821
647
}
822
648
826
652
827
653
/* Set effective uid to 0, return errno */
828
654
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
832
658
if(seteuid(0) == -1){
833
ret = errno;
659
ret_errno = errno;
834
660
}
835
661
errno = old_errno;
836
return ret;
662
return ret_errno;
837
663
}
838
664
839
665
/* Set effective and real user ID to 0. Return errno. */
840
666
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
if(ret != 0){
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
845
671
errno = old_errno;
846
return ret;
672
return ret_errno;
847
673
}
848
674
if(setuid(0) == -1){
849
ret = errno;
675
ret_errno = errno;
850
676
}
851
677
errno = old_errno;
852
return ret;
678
return ret_errno;
853
679
}
854
680
855
681
/* Set effective user ID to unprivileged saved user ID */
856
682
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
860
686
if(seteuid(uid) == -1){
861
ret = errno;
687
ret_errno = errno;
862
688
}
863
689
errno = old_errno;
864
return ret;
690
return ret_errno;
865
691
}
866
692
867
693
/* Lower privileges permanently */
868
694
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
872
698
if(setuid(uid) == -1){
873
ret = errno;
699
ret_errno = errno;
874
700
}
875
701
errno = old_errno;
876
return ret;
702
return ret_errno;
877
703
}
878
704
879
/* Helper function to add_local_route() and delete_local_route() */
705
/* Helper function to add_local_route() and remove_local_route() */
880
706
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
707
static bool add_remove_local_route(const bool add,
882
708
const char *address,
883
709
AvahiIfIndex if_index){
884
710
int ret;
885
711
char helper[] = "mandos-client-iprouteadddel";
886
712
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
713
char remove_arg[] = "remove";
889
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
715
if(pluginhelperdir == NULL){
891
716
if(debug){
935
760
perror_plus("dup2(devnull, STDIN_FILENO)");
936
761
_exit(EX_OSERR);
937
762
}
938
ret = close(devnull);
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
939
764
if(ret == -1){
940
765
perror_plus("close");
941
766
_exit(EX_OSERR);
958
783
helper, O_RDONLY));
959
784
if(helper_fd == -1){
960
785
perror_plus("openat");
961
close(helperdir_fd);
962
786
_exit(EX_UNAVAILABLE);
963
787
}
964
close(helperdir_fd);
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
965
789
#ifdef __GNUC__
966
790
#pragma GCC diagnostic push
967
791
#pragma GCC diagnostic ignored "-Wcast-qual"
968
792
#endif
969
793
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
972
environ) == -1){
794
{ helper, add ? add_arg : remove_arg, (char *)address,
795
interface, NULL }, environ) == -1){
973
796
#ifdef __GNUC__
974
797
#pragma GCC diagnostic pop
975
798
#endif
1027
850
__attribute__((nonnull, warn_unused_result))
1028
851
static bool add_local_route(const char *address,
1029
852
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1032
}
1033
return add_delete_local_route(true, address, if_index);
853
return add_remove_local_route(true, address, if_index);
1034
854
}
1035
855
1036
856
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
857
static bool remove_local_route(const char *address,
1038
858
AvahiIfIndex if_index){
1039
if(debug){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1041
}
1042
return add_delete_local_route(false, address, if_index);
859
return add_remove_local_route(false, address, if_index);
1043
860
}
1044
861
1045
862
/* Called when a Mandos server is found */
1086
903
bool match = false;
1087
904
{
1088
905
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
1092
908
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
909
match = true;
1094
910
break;
1136
952
goto mandos_end;
1137
953
}
1138
954
955
memset(&to, 0, sizeof(to));
1139
956
if(af == AF_INET6){
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1143
959
} else { /* IPv4 */
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1147
962
}
1148
963
if(ret < 0 ){
1149
964
int e = errno;
1228
1043
sizeof(struct sockaddr_in));
1229
1044
}
1230
1045
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1046
if(errno == ENETUNREACH
1232
1047
and if_index != AVAHI_IF_UNSPEC
1233
1048
and connect_to == NULL
1234
1049
and not route_added and
1247
1062
with an explicit route added with the server's address.
1248
1063
1249
1064
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
1066
https://bugs.debian.org/587961
1252
1067
*/
1253
if(debug){
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1255
" direct route\n");
1256
}
1257
1068
int e = errno;
1258
1069
route_added = add_local_route(ip, if_index);
1259
1070
if(route_added){
1433
1244
&decrypted_buffer, mc);
1434
1245
if(decrypted_buffer_size >= 0){
1435
1246
1436
clearerr(stdout);
1437
1247
written = 0;
1438
1248
while(written < (size_t) decrypted_buffer_size){
1439
1249
if(quit_now){
1455
1265
}
1456
1266
written += (size_t)ret;
1457
1267
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
1468
1268
retval = 0;
1469
1269
}
1470
1270
}
1474
1274
mandos_end:
1475
1275
{
1476
1276
if(route_added){
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1479
1279
" interface %d", ip, if_index);
1480
1280
}
1481
1281
}
1483
1283
free(decrypted_buffer);
1484
1284
free(buffer);
1485
1285
if(tcp_sd >= 0){
1486
ret = close(tcp_sd);
1286
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1487
1287
}
1488
1288
if(ret == -1){
1489
1289
if(e == 0){
1501
1301
return retval;
1502
1302
}
1503
1303
1304
__attribute__((nonnull))
1504
1305
static void resolve_callback(AvahiSServiceResolver *r,
1505
1306
AvahiIfIndex interface,
1506
1307
AvahiProtocol proto,
1643
1444
__attribute__((nonnull, warn_unused_result))
1644
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1645
1446
int ret;
1646
int old_errno;
1447
error_t ret_errno;
1647
1448
1648
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1649
1450
if(s < 0){
1650
old_errno = errno;
1451
ret_errno = errno;
1651
1452
perror_plus("socket");
1652
errno = old_errno;
1453
errno = ret_errno;
1653
1454
return false;
1654
1455
}
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1456
strcpy(ifr->ifr_name, ifname);
1657
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1658
1458
if(ret == -1){
1659
1459
if(debug){
1660
old_errno = errno;
1460
ret_errno = errno;
1661
1461
perror_plus("ioctl SIOCGIFFLAGS");
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1462
errno = ret_errno;
1668
1463
}
1669
1464
return false;
1670
1465
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1676
1466
return true;
1677
1467
}
1678
1468
1939
1729
return;
1940
1730
}
1941
1731
}
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1947
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1949
1744
if(numhooks == -1){
1950
1745
perror_plus("scandir");
1951
close(devnull);
1952
1746
return;
1953
1747
}
1954
1748
struct dirent *direntry;
1955
1749
int ret;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1751
if(devnull == -1){
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1753
return;
1754
}
1956
1755
for(int i = 0; i < numhooks; i++){
1957
1756
direntry = direntries[i];
1958
1757
if(debug){
2029
1828
perror_plus("openat");
2030
1829
_exit(EXIT_FAILURE);
2031
1830
}
2032
if(close(hookdir_fd) == -1){
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2033
1832
perror_plus("close");
2034
1833
_exit(EXIT_FAILURE);
2035
1834
}
2038
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
1838
_exit(EX_OSERR);
2040
1839
}
2041
ret = close(devnull);
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2042
1841
if(ret == -1){
2043
1842
perror_plus("close");
2044
1843
_exit(EX_OSERR);
2093
1892
free(direntry);
2094
1893
}
2095
1894
free(direntries);
2096
if(close(hookdir_fd) == -1){
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2097
1896
perror_plus("close");
2098
1897
} else {
2099
1898
hookdir_fd = -1;
2102
1901
}
2103
1902
2104
1903
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
2108
1907
int ret;
2109
1908
struct ifreq network;
2110
1909
unsigned int if_index = if_nametoindex(interface);
2120
1919
}
2121
1920
2122
1921
if(not interface_is_up(interface)){
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
1922
error_t ret_errno = 0, ioctl_errno = 0;
2125
1923
if(not get_flags(interface, &network)){
2126
1924
ret_errno = errno;
2127
1925
fprintf_plus(stderr, "Failed to get flags for interface "
2140
1938
}
2141
1939
2142
1940
if(quit_now){
2143
ret = close(sd);
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2144
1942
if(ret == -1){
2145
1943
perror_plus("close");
2146
1944
}
2196
1994
}
2197
1995
2198
1996
/* Close the socket */
2199
ret = close(sd);
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2200
1998
if(ret == -1){
2201
1999
perror_plus("close");
2202
2000
}
2214
2012
2215
2013
/* Sleep checking until interface is running.
2216
2014
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
2015
for(int i=0; i < delay * 4; i++){
2218
2016
if(interface_is_running(interface)){
2219
2017
break;
2220
2018
}
2230
2028
}
2231
2029
2232
2030
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2235
2033
struct ifreq network;
2236
2034
unsigned int if_index = if_nametoindex(interface);
2237
2035
if(if_index == 0){
2240
2038
return ENXIO;
2241
2039
}
2242
2040
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2041
error_t ret_errno = 0, ioctl_errno = 0;
2245
2042
if(not get_flags(interface, &network) and debug){
2246
2043
ret_errno = errno;
2247
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2285
2082
}
2286
2083
2287
2084
/* Close the socket */
2288
int ret = close(sd);
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2289
2086
if(ret == -1){
2290
2087
perror_plus("close");
2291
2088
}
2306
2103
}
2307
2104
2308
2105
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
2314
2110
AvahiSServiceBrowser *sb = NULL;
2315
2111
error_t ret_errno;
2316
2112
int ret;
2325
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2326
2122
const char *seckey = PATHDIR "/" SECKEY;
2327
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
2124
char *interfaces_hooks = NULL;
2330
2125
2331
2126
bool gnutls_initialized = false;
2384
2179
.doc = "Bit length of the prime number used in the"
2385
2180
" Diffie-Hellman key exchange",
2386
2181
.group = 2 },
2387
{ .name = "dh-params", .key = 134,
2388
.arg = "FILE",
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2391
.group = 2 },
2392
2182
{ .name = "priority", .key = 130,
2393
2183
.arg = "STRING",
2394
2184
.doc = "GnuTLS priority string for the TLS handshake",
2449
2239
}
2450
2240
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2451
2241
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
2455
2242
case 130: /* --priority */
2456
2243
mc.priority = arg;
2457
2244
break;
2497
2284
.args_doc = "",
2498
2285
.doc = "Mandos client -- Get and decrypt"
2499
2286
" passwords from a Mandos server" };
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
2287
ret = argp_parse(&argp, argc, argv,
2288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2289
switch(ret){
2503
2290
case 0:
2504
2291
break;
2505
2292
case ENOMEM:
2506
2293
default:
2507
errno = ret_errno;
2294
errno = ret;
2508
2295
perror_plus("argp_parse");
2509
2296
exitcode = EX_OSERR;
2510
2297
goto end;
2516
2303
2517
2304
{
2518
2305
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
2306
<http://bugs.debian.org/633582> */
2520
2307
2521
2308
/* Re-raise privileges */
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2525
2312
perror_plus("Failed to raise privileges");
2526
2313
} else {
2527
2314
struct stat st;
2543
2330
}
2544
2331
}
2545
2332
}
2546
close(seckey_fd);
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2547
2334
}
2548
2335
}
2549
2336
2564
2351
}
2565
2352
}
2566
2353
}
2567
close(pubkey_fd);
2568
}
2569
}
2570
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2576
} else {
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2578
if(ret == -1){
2579
perror_plus("fstat");
2580
} else {
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2584
if(ret == -1){
2585
perror_plus("fchown");
2586
}
2587
}
2588
}
2589
close(dhparams_fd);
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2590
2355
}
2591
2356
}
2592
2357
2593
2358
/* Lower privileges */
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2597
2362
perror_plus("Failed to lower privileges");
2598
2363
}
2599
2364
}
2769
2534
errno = bring_up_interface(interface, delay);
2770
2535
if(not interface_was_up){
2771
2536
if(errno != 0){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2537
perror_plus("Failed to bring up interface");
2774
2538
} else {
2775
2539
errno = argz_add(&interfaces_to_take_down,
2776
2540
&interfaces_to_take_down_size,
2799
2563
goto end;
2800
2564
}
2801
2565
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
2803
2567
if(ret == -1){
2804
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
2805
2569
exitcode = EX_UNAVAILABLE;
2927
2691
2928
2692
/* Allocate a new server */
2929
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
2694
&config, NULL, NULL, &ret_errno);
2931
2695
2932
2696
/* Free the Avahi configuration data */
2933
2697
avahi_server_config_free(&config);
2936
2700
/* Check if creating the Avahi server object succeeded */
2937
2701
if(mc.server == NULL){
2938
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
2703
avahi_strerror(ret_errno));
2940
2704
exitcode = EX_UNAVAILABLE;
2941
2705
goto end;
2942
2706
}
2977
2741
end:
2978
2742
2979
2743
if(debug){
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2987
2745
}
2988
2746
2989
2747
/* Cleanup things */
3000
2758
3001
2759
if(gnutls_initialized){
3002
2760
gnutls_certificate_free_credentials(mc.cred);
2761
gnutls_global_deinit();
3003
2762
gnutls_dh_params_deinit(mc.dh_params);
3004
2763
}
3005
2764
3028
2787
3029
2788
/* Re-raise privileges */
3030
2789
{
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
3034
2793
perror_plus("Failed to raise privileges");
3035
2794
} else {
3036
2795
3041
2800
/* Take down the network interfaces which were brought up */
3042
2801
{
3043
2802
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
errno = ret;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2805
interface))){
2806
ret_errno = take_down_interface(interface);
2807
if(ret_errno != 0){
2808
errno = ret_errno;
3050
2809
perror_plus("Failed to take down interface");
3051
2810
}
3052
2811
}
3057
2816
}
3058
2817
}
3059
2818
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
3063
2822
perror_plus("Failed to lower privileges permanently");
3064
2823
}
3065
2824
}
3067
2826
free(interfaces_to_take_down);
3068
2827
free(interfaces_hooks);
3069
2828
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
3072
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
3086
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
3124
2829
/* Removes the GPGME temp directory and all files inside */
3125
2830
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
2831
struct dirent **direntries = NULL;
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2871
}
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2873
}
3127
2874
}
3128
2875
3129
2876
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0