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237.25.5
(compared to revision 237.7.489)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-05 21:38:01 UTC
- mto: (237.7.307 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150705213801-pi8vk0ovlumuj826
plugin-helpers/mandos-client-iprouteadddel.c: Fix #include lines.
(main): Fix minor typo in error message.
(main): Fix minor typo in error message.
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
}
499
493
return plaintext_length;
500
494
}
501
495
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
496
__attribute__((warn_unused_result))
510
497
static const char *safer_gnutls_strerror(int value){
511
498
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
499
if(ret == NULL)
500
ret = "(unknown)";
501
return ret;
513
502
}
514
503
515
504
/* GnuTLS log function callback */
519
508
fprintf_plus(stderr, "GnuTLS: %s", string);
520
509
}
521
510
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
511
__attribute__((nonnull, warn_unused_result))
523
512
static int init_gnutls_global(const char *pubkeyfilename,
524
513
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
514
mandos_context *mc){
527
515
int ret;
528
unsigned int uret;
529
516
530
517
if(debug){
531
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
519
}
533
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
534
528
if(debug){
535
529
/* "Use a log level over 10 to enable all debugging options."
536
530
* - GnuTLS manual
544
538
if(ret != GNUTLS_E_SUCCESS){
545
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
540
safer_gnutls_strerror(ret));
541
gnutls_global_deinit();
547
542
return -1;
548
543
}
549
544
574
569
safer_gnutls_strerror(ret));
575
570
goto globalfail;
576
571
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
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
754
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
755
580
756
581
return 0;
758
583
globalfail:
759
584
760
585
gnutls_certificate_free_credentials(mc->cred);
586
gnutls_global_deinit();
761
587
gnutls_dh_params_deinit(mc->dh_params);
762
588
return -1;
763
589
}
815
641
/* ignore client certificate if any. */
816
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
817
643
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
818
646
return 0;
819
647
}
820
648
824
652
825
653
/* Set effective uid to 0, return errno */
826
654
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
830
658
if(seteuid(0) == -1){
831
ret = errno;
659
ret_errno = errno;
832
660
}
833
661
errno = old_errno;
834
return ret;
662
return ret_errno;
835
663
}
836
664
837
665
/* Set effective and real user ID to 0. Return errno. */
838
666
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
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){
843
671
errno = old_errno;
844
return ret;
672
return ret_errno;
845
673
}
846
674
if(setuid(0) == -1){
847
ret = errno;
675
ret_errno = errno;
848
676
}
849
677
errno = old_errno;
850
return ret;
678
return ret_errno;
851
679
}
852
680
853
681
/* Set effective user ID to unprivileged saved user ID */
854
682
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
858
686
if(seteuid(uid) == -1){
859
ret = errno;
687
ret_errno = errno;
860
688
}
861
689
errno = old_errno;
862
return ret;
690
return ret_errno;
863
691
}
864
692
865
693
/* Lower privileges permanently */
866
694
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
870
698
if(setuid(uid) == -1){
871
ret = errno;
699
ret_errno = errno;
872
700
}
873
701
errno = old_errno;
874
return ret;
702
return ret_errno;
875
703
}
876
704
877
/* Helper function to add_local_route() and delete_local_route() */
705
/* Helper function to add_local_route() and remove_local_route() */
878
706
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
707
static bool add_remove_local_route(const bool add,
880
708
const char *address,
881
709
AvahiIfIndex if_index){
882
710
int ret;
883
711
char helper[] = "mandos-client-iprouteadddel";
884
712
char add_arg[] = "add";
885
713
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
715
if(pluginhelperdir == NULL){
889
716
if(debug){
933
760
perror_plus("dup2(devnull, STDIN_FILENO)");
934
761
_exit(EX_OSERR);
935
762
}
936
ret = close(devnull);
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
937
764
if(ret == -1){
938
765
perror_plus("close");
939
766
_exit(EX_OSERR);
956
783
helper, O_RDONLY));
957
784
if(helper_fd == -1){
958
785
perror_plus("openat");
959
close(helperdir_fd);
960
786
_exit(EX_UNAVAILABLE);
961
787
}
962
close(helperdir_fd);
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
963
789
#ifdef __GNUC__
964
790
#pragma GCC diagnostic push
965
791
#pragma GCC diagnostic ignored "-Wcast-qual"
966
792
#endif
967
793
if(fexecve(helper_fd, (char *const [])
968
794
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
795
interface, NULL }, environ) == -1){
971
796
#ifdef __GNUC__
972
797
#pragma GCC diagnostic pop
973
798
#endif
1025
850
__attribute__((nonnull, warn_unused_result))
1026
851
static bool add_local_route(const char *address,
1027
852
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
853
return add_remove_local_route(true, address, if_index);
1032
854
}
1033
855
1034
856
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
857
static bool remove_local_route(const char *address,
1036
858
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
859
return add_remove_local_route(false, address, if_index);
1041
860
}
1042
861
1043
862
/* Called when a Mandos server is found */
1084
903
bool match = false;
1085
904
{
1086
905
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
1090
908
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
909
match = true;
1092
910
break;
1134
952
goto mandos_end;
1135
953
}
1136
954
955
memset(&to, 0, sizeof(to));
1137
956
if(af == AF_INET6){
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
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);
1141
959
} else { /* IPv4 */
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
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);
1145
962
}
1146
963
if(ret < 0 ){
1147
964
int e = errno;
1226
1043
sizeof(struct sockaddr_in));
1227
1044
}
1228
1045
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1046
if(errno == ENETUNREACH
1230
1047
and if_index != AVAHI_IF_UNSPEC
1231
1048
and connect_to == NULL
1232
1049
and not route_added and
1245
1062
with an explicit route added with the server's address.
1246
1063
1247
1064
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
1066
https://bugs.debian.org/587961
1250
1067
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
1068
int e = errno;
1256
1069
route_added = add_local_route(ip, if_index);
1257
1070
if(route_added){
1431
1244
&decrypted_buffer, mc);
1432
1245
if(decrypted_buffer_size >= 0){
1433
1246
1434
clearerr(stdout);
1435
1247
written = 0;
1436
1248
while(written < (size_t) decrypted_buffer_size){
1437
1249
if(quit_now){
1453
1265
}
1454
1266
written += (size_t)ret;
1455
1267
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1466
1268
retval = 0;
1467
1269
}
1468
1270
}
1472
1274
mandos_end:
1473
1275
{
1474
1276
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
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"
1477
1279
" interface %d", ip, if_index);
1478
1280
}
1479
1281
}
1481
1283
free(decrypted_buffer);
1482
1284
free(buffer);
1483
1285
if(tcp_sd >= 0){
1484
ret = close(tcp_sd);
1286
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1485
1287
}
1486
1288
if(ret == -1){
1487
1289
if(e == 0){
1499
1301
return retval;
1500
1302
}
1501
1303
1304
__attribute__((nonnull))
1502
1305
static void resolve_callback(AvahiSServiceResolver *r,
1503
1306
AvahiIfIndex interface,
1504
1307
AvahiProtocol proto,
1641
1444
__attribute__((nonnull, warn_unused_result))
1642
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
1446
int ret;
1644
int old_errno;
1447
error_t ret_errno;
1645
1448
1646
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
1450
if(s < 0){
1648
old_errno = errno;
1451
ret_errno = errno;
1649
1452
perror_plus("socket");
1650
errno = old_errno;
1453
errno = ret_errno;
1651
1454
return false;
1652
1455
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1456
strcpy(ifr->ifr_name, ifname);
1655
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
1458
if(ret == -1){
1657
1459
if(debug){
1658
old_errno = errno;
1460
ret_errno = errno;
1659
1461
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1462
errno = ret_errno;
1666
1463
}
1667
1464
return false;
1668
1465
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
1466
return true;
1675
1467
}
1676
1468
1937
1729
return;
1938
1730
}
1939
1731
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1945
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
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__ */
1947
1744
if(numhooks == -1){
1948
1745
perror_plus("scandir");
1949
close(devnull);
1950
1746
return;
1951
1747
}
1952
1748
struct dirent *direntry;
1953
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
}
1954
1755
for(int i = 0; i < numhooks; i++){
1955
1756
direntry = direntries[i];
1956
1757
if(debug){
2027
1828
perror_plus("openat");
2028
1829
_exit(EXIT_FAILURE);
2029
1830
}
2030
if(close(hookdir_fd) == -1){
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2031
1832
perror_plus("close");
2032
1833
_exit(EXIT_FAILURE);
2033
1834
}
2036
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
1838
_exit(EX_OSERR);
2038
1839
}
2039
ret = close(devnull);
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2040
1841
if(ret == -1){
2041
1842
perror_plus("close");
2042
1843
_exit(EX_OSERR);
2091
1892
free(direntry);
2092
1893
}
2093
1894
free(direntries);
2094
if(close(hookdir_fd) == -1){
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2095
1896
perror_plus("close");
2096
1897
} else {
2097
1898
hookdir_fd = -1;
2100
1901
}
2101
1902
2102
1903
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
2106
1907
int ret;
2107
1908
struct ifreq network;
2108
1909
unsigned int if_index = if_nametoindex(interface);
2118
1919
}
2119
1920
2120
1921
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
1922
error_t ret_errno = 0, ioctl_errno = 0;
2123
1923
if(not get_flags(interface, &network)){
2124
1924
ret_errno = errno;
2125
1925
fprintf_plus(stderr, "Failed to get flags for interface "
2138
1938
}
2139
1939
2140
1940
if(quit_now){
2141
ret = close(sd);
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2142
1942
if(ret == -1){
2143
1943
perror_plus("close");
2144
1944
}
2194
1994
}
2195
1995
2196
1996
/* Close the socket */
2197
ret = close(sd);
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2198
1998
if(ret == -1){
2199
1999
perror_plus("close");
2200
2000
}
2212
2012
2213
2013
/* Sleep checking until interface is running.
2214
2014
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
2015
for(int i=0; i < delay * 4; i++){
2216
2016
if(interface_is_running(interface)){
2217
2017
break;
2218
2018
}
2228
2028
}
2229
2029
2230
2030
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2233
2033
struct ifreq network;
2234
2034
unsigned int if_index = if_nametoindex(interface);
2235
2035
if(if_index == 0){
2238
2038
return ENXIO;
2239
2039
}
2240
2040
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2041
error_t ret_errno = 0, ioctl_errno = 0;
2243
2042
if(not get_flags(interface, &network) and debug){
2244
2043
ret_errno = errno;
2245
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2283
2082
}
2284
2083
2285
2084
/* Close the socket */
2286
int ret = close(sd);
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2287
2086
if(ret == -1){
2288
2087
perror_plus("close");
2289
2088
}
2304
2103
}
2305
2104
2306
2105
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.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 };
2312
2110
AvahiSServiceBrowser *sb = NULL;
2313
2111
error_t ret_errno;
2314
2112
int ret;
2323
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
2122
const char *seckey = PATHDIR "/" SECKEY;
2325
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
2124
char *interfaces_hooks = NULL;
2328
2125
2329
2126
bool gnutls_initialized = false;
2382
2179
.doc = "Bit length of the prime number used in the"
2383
2180
" Diffie-Hellman key exchange",
2384
2181
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
2390
2182
{ .name = "priority", .key = 130,
2391
2183
.arg = "STRING",
2392
2184
.doc = "GnuTLS priority string for the TLS handshake",
2447
2239
}
2448
2240
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2449
2241
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2453
2242
case 130: /* --priority */
2454
2243
mc.priority = arg;
2455
2244
break;
2495
2284
.args_doc = "",
2496
2285
.doc = "Mandos client -- Get and decrypt"
2497
2286
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2287
ret = argp_parse(&argp, argc, argv,
2288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2289
switch(ret){
2501
2290
case 0:
2502
2291
break;
2503
2292
case ENOMEM:
2504
2293
default:
2505
errno = ret_errno;
2294
errno = ret;
2506
2295
perror_plus("argp_parse");
2507
2296
exitcode = EX_OSERR;
2508
2297
goto end;
2514
2303
2515
2304
{
2516
2305
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2306
<http://bugs.debian.org/633582> */
2518
2307
2519
2308
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2523
2312
perror_plus("Failed to raise privileges");
2524
2313
} else {
2525
2314
struct stat st;
2541
2330
}
2542
2331
}
2543
2332
}
2544
close(seckey_fd);
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2545
2334
}
2546
2335
}
2547
2336
2562
2351
}
2563
2352
}
2564
2353
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2588
2355
}
2589
2356
}
2590
2357
2591
2358
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2595
2362
perror_plus("Failed to lower privileges");
2596
2363
}
2597
2364
}
2767
2534
errno = bring_up_interface(interface, delay);
2768
2535
if(not interface_was_up){
2769
2536
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2537
perror_plus("Failed to bring up interface");
2772
2538
} else {
2773
2539
errno = argz_add(&interfaces_to_take_down,
2774
2540
&interfaces_to_take_down_size,
2797
2563
goto end;
2798
2564
}
2799
2565
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
2801
2567
if(ret == -1){
2802
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
2569
exitcode = EX_UNAVAILABLE;
2925
2691
2926
2692
/* Allocate a new server */
2927
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2694
&config, NULL, NULL, &ret_errno);
2929
2695
2930
2696
/* Free the Avahi configuration data */
2931
2697
avahi_server_config_free(&config);
2934
2700
/* Check if creating the Avahi server object succeeded */
2935
2701
if(mc.server == NULL){
2936
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2703
avahi_strerror(ret_errno));
2938
2704
exitcode = EX_UNAVAILABLE;
2939
2705
goto end;
2940
2706
}
2975
2741
end:
2976
2742
2977
2743
if(debug){
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2985
2745
}
2986
2746
2987
2747
/* Cleanup things */
2998
2758
2999
2759
if(gnutls_initialized){
3000
2760
gnutls_certificate_free_credentials(mc.cred);
2761
gnutls_global_deinit();
3001
2762
gnutls_dh_params_deinit(mc.dh_params);
3002
2763
}
3003
2764
3026
2787
3027
2788
/* Re-raise privileges */
3028
2789
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
3032
2793
perror_plus("Failed to raise privileges");
3033
2794
} else {
3034
2795
3039
2800
/* Take down the network interfaces which were brought up */
3040
2801
{
3041
2802
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
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;
3048
2809
perror_plus("Failed to take down interface");
3049
2810
}
3050
2811
}
3055
2816
}
3056
2817
}
3057
2818
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
3061
2822
perror_plus("Failed to lower privileges permanently");
3062
2823
}
3063
2824
}
3065
2826
free(interfaces_to_take_down);
3066
2827
free(interfaces_hooks);
3067
2828
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3122
2829
/* Removes the GPGME temp directory and all files inside */
3123
2830
if(tempdir != NULL){
3124
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
}
3125
2874
}
3126
2875
3127
2876
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0