To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 927
- compare with another revision
- download diff
- download tarball
- view history from revision 927
- Committer: Teddy Hogeborn
- Date: 2018-02-10 13:23:58 UTC
- Revision ID: teddy@recompile.se-20180210132358-8pfvo9vshq9l32y5
Remove unnecessary text left from old example init.d file
* init.d-mandos: Remove unnecessary text left from old example init.d
file.
* init.d-mandos: Remove unnecessary text left from old example init.d
file.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 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
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
60
inet_pton(), connect(),
59
61
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
64
*/
63
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
66
strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
305
311
return false;
306
312
}
307
313
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
309
315
if(ret == -1){
310
316
perror_plus("close");
311
317
}
493
499
return plaintext_length;
494
500
}
495
501
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
496
509
__attribute__((warn_unused_result))
497
510
static const char *safer_gnutls_strerror(int value){
498
511
const char *ret = gnutls_strerror(value);
499
if(ret == NULL)
500
ret = "(unknown)";
501
return ret;
512
return safe_string(ret);
502
513
}
503
514
504
515
/* GnuTLS log function callback */
508
519
fprintf_plus(stderr, "GnuTLS: %s", string);
509
520
}
510
521
511
__attribute__((nonnull, warn_unused_result))
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
512
523
static int init_gnutls_global(const char *pubkeyfilename,
513
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
514
526
mandos_context *mc){
515
527
int ret;
528
unsigned int uret;
516
529
517
530
if(debug){
518
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
519
532
}
520
533
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
528
534
if(debug){
529
535
/* "Use a log level over 10 to enable all debugging options."
530
536
* - GnuTLS manual
538
544
if(ret != GNUTLS_E_SUCCESS){
539
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
546
safer_gnutls_strerror(ret));
541
gnutls_global_deinit();
542
547
return -1;
543
548
}
544
549
569
574
safer_gnutls_strerror(ret));
570
575
goto globalfail;
571
576
}
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
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
if(params.data == NULL){
617
dhparamsfilename = NULL;
618
}
619
if(dhparamsfilename == NULL){
620
break;
621
}
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
629
}
630
free(params.data);
631
} while(false);
632
}
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
do {
639
int secfile = open(seckeyfilename, O_RDONLY);
640
if(secfile == -1){
641
perror_plus("open");
642
break;
643
}
644
size_t buffer_capacity = 0;
645
while(true){
646
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer.size,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
651
free(buffer.data);
652
buffer.data = NULL;
653
break;
654
}
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
657
BUFFER_SIZE);
658
/* EOF */
659
if(bytes_read == 0){
660
break;
661
}
662
/* check bytes_read for failure */
663
if(bytes_read < 0){
664
perror_plus("read");
665
free(buffer.data);
666
buffer.data = NULL;
667
break;
668
}
669
buffer.size += (unsigned int)bytes_read;
670
}
671
close(secfile);
672
} while(false);
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
676
{
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
" structure: %s",
682
safer_gnutls_strerror(ret));
683
free(buffer.data);
684
buffer.data = NULL;
685
} else {
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
691
privkey = NULL;
692
}
693
free(buffer.data);
694
buffer.data = NULL;
695
if(privkey != NULL){
696
/* Use private key to suggest an appropriate
697
sec_param */
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
700
if(debug){
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
704
(sec_param)));
705
}
706
}
707
}
708
}
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
if(debug){
713
fprintf_plus(stderr, "Falling back to security parameter"
714
" \"%s\"\n",
715
safe_string(gnutls_sec_param_get_name
716
(sec_param)));
717
}
718
}
719
}
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
if(uret != 0){
722
mc->dh_bits = uret;
723
if(debug){
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
mc->dh_bits);
729
}
730
} else {
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
734
(sec_param)),
735
safer_gnutls_strerror(ret));
736
goto globalfail;
737
}
738
} else if(debug){
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
mc->dh_bits);
741
}
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
747
goto globalfail;
748
}
749
}
579
750
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
580
751
581
752
return 0;
583
754
globalfail:
584
755
585
756
gnutls_certificate_free_credentials(mc->cred);
586
gnutls_global_deinit();
587
757
gnutls_dh_params_deinit(mc->dh_params);
588
758
return -1;
589
759
}
641
811
/* ignore client certificate if any. */
642
812
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
813
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
646
814
return 0;
647
815
}
648
816
652
820
653
821
/* Set effective uid to 0, return errno */
654
822
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
658
826
if(seteuid(0) == -1){
659
ret_errno = errno;
827
ret = errno;
660
828
}
661
829
errno = old_errno;
662
return ret_errno;
830
return ret;
663
831
}
664
832
665
833
/* Set effective and real user ID to 0. Return errno. */
666
834
__attribute__((warn_unused_result))
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){
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
671
839
errno = old_errno;
672
return ret_errno;
840
return ret;
673
841
}
674
842
if(setuid(0) == -1){
675
ret_errno = errno;
843
ret = errno;
676
844
}
677
845
errno = old_errno;
678
return ret_errno;
846
return ret;
679
847
}
680
848
681
849
/* Set effective user ID to unprivileged saved user ID */
682
850
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
686
854
if(seteuid(uid) == -1){
687
ret_errno = errno;
855
ret = errno;
688
856
}
689
857
errno = old_errno;
690
return ret_errno;
858
return ret;
691
859
}
692
860
693
861
/* Lower privileges permanently */
694
862
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
698
866
if(setuid(uid) == -1){
699
ret_errno = errno;
867
ret = errno;
700
868
}
701
869
errno = old_errno;
702
return ret_errno;
870
return ret;
703
871
}
704
872
705
/* Helper function to add_local_route() and remove_local_route() */
873
/* Helper function to add_local_route() and delete_local_route() */
706
874
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
875
static bool add_delete_local_route(const bool add,
708
876
const char *address,
709
877
AvahiIfIndex if_index){
710
878
int ret;
711
879
char helper[] = "mandos-client-iprouteadddel";
712
880
char add_arg[] = "add";
713
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
714
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
884
if(pluginhelperdir == NULL){
716
885
if(debug){
760
929
perror_plus("dup2(devnull, STDIN_FILENO)");
761
930
_exit(EX_OSERR);
762
931
}
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
932
ret = close(devnull);
764
933
if(ret == -1){
765
934
perror_plus("close");
766
935
_exit(EX_OSERR);
783
952
helper, O_RDONLY));
784
953
if(helper_fd == -1){
785
954
perror_plus("openat");
955
close(helperdir_fd);
786
956
_exit(EX_UNAVAILABLE);
787
957
}
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
958
close(helperdir_fd);
789
959
#ifdef __GNUC__
790
960
#pragma GCC diagnostic push
791
961
#pragma GCC diagnostic ignored "-Wcast-qual"
792
962
#endif
793
963
if(fexecve(helper_fd, (char *const [])
794
964
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
965
interface, debug ? debug_flag : NULL, NULL },
966
environ) == -1){
796
967
#ifdef __GNUC__
797
968
#pragma GCC diagnostic pop
798
969
#endif
850
1021
__attribute__((nonnull, warn_unused_result))
851
1022
static bool add_local_route(const char *address,
852
1023
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
1024
if(debug){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
}
1027
return add_delete_local_route(true, address, if_index);
854
1028
}
855
1029
856
1030
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
1031
static bool delete_local_route(const char *address,
858
1032
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
1033
if(debug){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
}
1036
return add_delete_local_route(false, address, if_index);
860
1037
}
861
1038
862
1039
/* Called when a Mandos server is found */
903
1080
bool match = false;
904
1081
{
905
1082
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
908
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
909
1087
match = true;
910
1088
break;
952
1130
goto mandos_end;
953
1131
}
954
1132
955
memset(&to, 0, sizeof(to));
956
1133
if(af == AF_INET6){
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
959
1137
} else { /* IPv4 */
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
962
1141
}
963
1142
if(ret < 0 ){
964
1143
int e = errno;
1043
1222
sizeof(struct sockaddr_in));
1044
1223
}
1045
1224
if(ret < 0){
1046
if(errno == ENETUNREACH
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1047
1226
and if_index != AVAHI_IF_UNSPEC
1048
1227
and connect_to == NULL
1049
1228
and not route_added and
1062
1241
with an explicit route added with the server's address.
1063
1242
1064
1243
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
1245
https://bugs.debian.org/587961
1067
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1068
1251
int e = errno;
1069
1252
route_added = add_local_route(ip, if_index);
1070
1253
if(route_added){
1244
1427
&decrypted_buffer, mc);
1245
1428
if(decrypted_buffer_size >= 0){
1246
1429
1430
clearerr(stdout);
1247
1431
written = 0;
1248
1432
while(written < (size_t) decrypted_buffer_size){
1249
1433
if(quit_now){
1265
1449
}
1266
1450
written += (size_t)ret;
1267
1451
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
1268
1462
retval = 0;
1269
1463
}
1270
1464
}
1274
1468
mandos_end:
1275
1469
{
1276
1470
if(route_added){
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1471
if(not delete_local_route(ip, if_index)){
1472
fprintf_plus(stderr, "Failed to delete local route to %s on"
1279
1473
" interface %d", ip, if_index);
1280
1474
}
1281
1475
}
1283
1477
free(decrypted_buffer);
1284
1478
free(buffer);
1285
1479
if(tcp_sd >= 0){
1286
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
ret = close(tcp_sd);
1287
1481
}
1288
1482
if(ret == -1){
1289
1483
if(e == 0){
1301
1495
return retval;
1302
1496
}
1303
1497
1304
__attribute__((nonnull))
1305
1498
static void resolve_callback(AvahiSServiceResolver *r,
1306
1499
AvahiIfIndex interface,
1307
1500
AvahiProtocol proto,
1444
1637
__attribute__((nonnull, warn_unused_result))
1445
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1446
1639
int ret;
1447
error_t ret_errno;
1640
int old_errno;
1448
1641
1449
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1450
1643
if(s < 0){
1451
ret_errno = errno;
1644
old_errno = errno;
1452
1645
perror_plus("socket");
1453
errno = ret_errno;
1646
errno = old_errno;
1454
1647
return false;
1455
1648
}
1456
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1457
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1458
1652
if(ret == -1){
1459
1653
if(debug){
1460
ret_errno = errno;
1654
old_errno = errno;
1461
1655
perror_plus("ioctl SIOCGIFFLAGS");
1462
errno = ret_errno;
1656
errno = old_errno;
1463
1657
}
1464
1658
return false;
1465
1659
}
1729
1923
return;
1730
1924
}
1731
1925
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1734
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
1927
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__ */
1744
1928
if(numhooks == -1){
1745
1929
perror_plus("scandir");
1746
1930
return;
1828
2012
perror_plus("openat");
1829
2013
_exit(EXIT_FAILURE);
1830
2014
}
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
if(close(hookdir_fd) == -1){
1832
2016
perror_plus("close");
1833
2017
_exit(EXIT_FAILURE);
1834
2018
}
1837
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
1838
2022
_exit(EX_OSERR);
1839
2023
}
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2024
ret = close(devnull);
1841
2025
if(ret == -1){
1842
2026
perror_plus("close");
1843
2027
_exit(EX_OSERR);
1892
2076
free(direntry);
1893
2077
}
1894
2078
free(direntries);
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2079
if(close(hookdir_fd) == -1){
1896
2080
perror_plus("close");
1897
2081
} else {
1898
2082
hookdir_fd = -1;
1901
2085
}
1902
2086
1903
2087
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
1907
2091
int ret;
1908
2092
struct ifreq network;
1909
2093
unsigned int if_index = if_nametoindex(interface);
1919
2103
}
1920
2104
1921
2105
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
1923
2108
if(not get_flags(interface, &network)){
1924
2109
ret_errno = errno;
1925
2110
fprintf_plus(stderr, "Failed to get flags for interface "
1938
2123
}
1939
2124
1940
2125
if(quit_now){
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2126
ret = close(sd);
1942
2127
if(ret == -1){
1943
2128
perror_plus("close");
1944
2129
}
1994
2179
}
1995
2180
1996
2181
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
ret = close(sd);
1998
2183
if(ret == -1){
1999
2184
perror_plus("close");
2000
2185
}
2012
2197
2013
2198
/* Sleep checking until interface is running.
2014
2199
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2200
for(int i = 0; i < delay * 4; i++){
2016
2201
if(interface_is_running(interface)){
2017
2202
break;
2018
2203
}
2028
2213
}
2029
2214
2030
2215
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2033
2218
struct ifreq network;
2034
2219
unsigned int if_index = if_nametoindex(interface);
2035
2220
if(if_index == 0){
2038
2223
return ENXIO;
2039
2224
}
2040
2225
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2042
2228
if(not get_flags(interface, &network) and debug){
2043
2229
ret_errno = errno;
2044
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2082
2268
}
2083
2269
2084
2270
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
int ret = close(sd);
2086
2272
if(ret == -1){
2087
2273
perror_plus("close");
2088
2274
}
2103
2289
}
2104
2290
2105
2291
int main(int argc, char *argv[]){
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 };
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
2110
2297
AvahiSServiceBrowser *sb = NULL;
2111
2298
error_t ret_errno;
2112
2299
int ret;
2121
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2122
2309
const char *seckey = PATHDIR "/" SECKEY;
2123
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2124
2312
char *interfaces_hooks = NULL;
2125
2313
2126
2314
bool gnutls_initialized = false;
2179
2367
.doc = "Bit length of the prime number used in the"
2180
2368
" Diffie-Hellman key exchange",
2181
2369
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
2182
2375
{ .name = "priority", .key = 130,
2183
2376
.arg = "STRING",
2184
2377
.doc = "GnuTLS priority string for the TLS handshake",
2239
2432
}
2240
2433
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2241
2434
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2242
2438
case 130: /* --priority */
2243
2439
mc.priority = arg;
2244
2440
break;
2284
2480
.args_doc = "",
2285
2481
.doc = "Mandos client -- Get and decrypt"
2286
2482
" passwords from a Mandos server" };
2287
ret = argp_parse(&argp, argc, argv,
2288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2289
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
2290
2486
case 0:
2291
2487
break;
2292
2488
case ENOMEM:
2293
2489
default:
2294
errno = ret;
2490
errno = ret_errno;
2295
2491
perror_plus("argp_parse");
2296
2492
exitcode = EX_OSERR;
2297
2493
goto end;
2303
2499
2304
2500
{
2305
2501
/* Work around Debian bug #633582:
2306
<http://bugs.debian.org/633582> */
2502
<https://bugs.debian.org/633582> */
2307
2503
2308
2504
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2312
2508
perror_plus("Failed to raise privileges");
2313
2509
} else {
2314
2510
struct stat st;
2330
2526
}
2331
2527
}
2332
2528
}
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
close(seckey_fd);
2334
2530
}
2335
2531
}
2336
2532
2351
2547
}
2352
2548
}
2353
2549
}
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2355
2573
}
2356
2574
}
2357
2575
2358
2576
/* Lower privileges */
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2362
2580
perror_plus("Failed to lower privileges");
2363
2581
}
2364
2582
}
2534
2752
errno = bring_up_interface(interface, delay);
2535
2753
if(not interface_was_up){
2536
2754
if(errno != 0){
2537
perror_plus("Failed to bring up interface");
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2538
2757
} else {
2539
2758
errno = argz_add(&interfaces_to_take_down,
2540
2759
&interfaces_to_take_down_size,
2563
2782
goto end;
2564
2783
}
2565
2784
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2567
2786
if(ret == -1){
2568
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
2569
2788
exitcode = EX_UNAVAILABLE;
2691
2910
2692
2911
/* Allocate a new server */
2693
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2694
&config, NULL, NULL, &ret_errno);
2913
&config, NULL, NULL, &ret);
2695
2914
2696
2915
/* Free the Avahi configuration data */
2697
2916
avahi_server_config_free(&config);
2700
2919
/* Check if creating the Avahi server object succeeded */
2701
2920
if(mc.server == NULL){
2702
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2703
avahi_strerror(ret_errno));
2922
avahi_strerror(ret));
2704
2923
exitcode = EX_UNAVAILABLE;
2705
2924
goto end;
2706
2925
}
2741
2960
end:
2742
2961
2743
2962
if(debug){
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2745
2970
}
2746
2971
2747
2972
/* Cleanup things */
2758
2983
2759
2984
if(gnutls_initialized){
2760
2985
gnutls_certificate_free_credentials(mc.cred);
2761
gnutls_global_deinit();
2762
2986
gnutls_dh_params_deinit(mc.dh_params);
2763
2987
}
2764
2988
2787
3011
2788
3012
/* Re-raise privileges */
2789
3013
{
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
2793
3017
perror_plus("Failed to raise privileges");
2794
3018
} else {
2795
3019
2800
3024
/* Take down the network interfaces which were brought up */
2801
3025
{
2802
3026
char *interface = NULL;
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;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
2809
3033
perror_plus("Failed to take down interface");
2810
3034
}
2811
3035
}
2816
3040
}
2817
3041
}
2818
3042
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
2822
3046
perror_plus("Failed to lower privileges permanently");
2823
3047
}
2824
3048
}
2826
3050
free(interfaces_to_take_down);
2827
3051
free(interfaces_hooks);
2828
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
2829
3109
/* Removes the GPGME temp directory and all files inside */
2830
3110
if(tempdir != NULL){
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
}
3111
clean_dir_at(-1, tempdir, 0);
2874
3112
}
2875
3113
2876
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0