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 237.4.98
- compare with another revision
- download diff
- download tarball
- view history from revision 237.4.98
- Committer: Teddy Hogeborn
- Date: 2018-02-22 18:50:12 UTC
- mto: This revision was merged to the branch mainline in revision 943.
- Revision ID: teddy@recompile.se-20180222185012-etchk537ast7s1xg
Tags: version-1.7.19-1
* Makefile (version): Change to 1.7.19.
* NEWS (Version 1.7.19): Add new entry.
* debian/changelog (1.7.19-1): - '' -
* NEWS (Version 1.7.19): Add new entry.
* debian/changelog (1.7.19-1): - '' -
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
}
513
519
fprintf_plus(stderr, "GnuTLS: %s", string);
514
520
}
515
521
516
__attribute__((nonnull, warn_unused_result))
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
523
static int init_gnutls_global(const char *pubkeyfilename,
518
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
519
526
mandos_context *mc){
520
527
int ret;
521
528
unsigned int uret;
524
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
525
532
}
526
533
527
ret = gnutls_global_init();
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
531
return -1;
532
}
533
534
534
if(debug){
535
535
/* "Use a log level over 10 to enable all debugging options."
536
536
* - GnuTLS manual
544
544
if(ret != GNUTLS_E_SUCCESS){
545
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
546
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
548
547
return -1;
549
548
}
550
549
575
574
safer_gnutls_strerror(ret));
576
575
goto globalfail;
577
576
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
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;
585
588
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
590
593
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
593
597
break;
594
598
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
596
601
BUFFER_SIZE);
597
602
/* EOF */
598
603
if(bytes_read == 0){
601
606
/* check bytes_read for failure */
602
607
if(bytes_read < 0){
603
608
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
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);
627
683
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
629
686
safer_gnutls_strerror(ret));
630
privkey = NULL;
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
}
631
711
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
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)));
644
721
}
645
722
}
646
723
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
650
727
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
653
730
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
731
(sec_param)),
732
mc->dh_bits);
655
733
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
664
737
safe_string(gnutls_sec_param_get_name
665
738
(sec_param)),
666
mc->dh_bits);
739
safer_gnutls_strerror(ret));
740
goto globalfail;
667
741
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
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,
672
750
safer_gnutls_strerror(ret));
673
751
goto globalfail;
674
752
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
683
goto globalfail;
684
}
685
753
}
686
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
687
755
688
756
return 0;
690
758
globalfail:
691
759
692
760
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
694
761
gnutls_dh_params_deinit(mc->dh_params);
695
762
return -1;
696
763
}
748
815
/* ignore client certificate if any. */
749
816
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
817
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
753
818
return 0;
754
819
}
755
820
759
824
760
825
/* Set effective uid to 0, return errno */
761
826
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
765
830
if(seteuid(0) == -1){
766
ret_errno = errno;
831
ret = errno;
767
832
}
768
833
errno = old_errno;
769
return ret_errno;
834
return ret;
770
835
}
771
836
772
837
/* Set effective and real user ID to 0. Return errno. */
773
838
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
777
if(ret_errno != 0){
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
778
843
errno = old_errno;
779
return ret_errno;
844
return ret;
780
845
}
781
846
if(setuid(0) == -1){
782
ret_errno = errno;
847
ret = errno;
783
848
}
784
849
errno = old_errno;
785
return ret_errno;
850
return ret;
786
851
}
787
852
788
853
/* Set effective user ID to unprivileged saved user ID */
789
854
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
793
858
if(seteuid(uid) == -1){
794
ret_errno = errno;
859
ret = errno;
795
860
}
796
861
errno = old_errno;
797
return ret_errno;
862
return ret;
798
863
}
799
864
800
865
/* Lower privileges permanently */
801
866
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
805
870
if(setuid(uid) == -1){
806
ret_errno = errno;
871
ret = errno;
807
872
}
808
873
errno = old_errno;
809
return ret_errno;
874
return ret;
810
875
}
811
876
812
877
/* Helper function to add_local_route() and delete_local_route() */
868
933
perror_plus("dup2(devnull, STDIN_FILENO)");
869
934
_exit(EX_OSERR);
870
935
}
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
936
ret = close(devnull);
872
937
if(ret == -1){
873
938
perror_plus("close");
874
939
_exit(EX_OSERR);
891
956
helper, O_RDONLY));
892
957
if(helper_fd == -1){
893
958
perror_plus("openat");
959
close(helperdir_fd);
894
960
_exit(EX_UNAVAILABLE);
895
961
}
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
962
close(helperdir_fd);
897
963
#ifdef __GNUC__
898
964
#pragma GCC diagnostic push
899
965
#pragma GCC diagnostic ignored "-Wcast-qual"
1018
1084
bool match = false;
1019
1085
{
1020
1086
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
1023
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
1024
1091
match = true;
1025
1092
break;
1067
1134
goto mandos_end;
1068
1135
}
1069
1136
1070
memset(&to, 0, sizeof(to));
1071
1137
if(af == AF_INET6){
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
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);
1074
1141
} else { /* IPv4 */
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
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);
1077
1145
}
1078
1146
if(ret < 0 ){
1079
1147
int e = errno;
1158
1226
sizeof(struct sockaddr_in));
1159
1227
}
1160
1228
if(ret < 0){
1161
if(errno == ENETUNREACH
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1162
1230
and if_index != AVAHI_IF_UNSPEC
1163
1231
and connect_to == NULL
1164
1232
and not route_added and
1177
1245
with an explicit route added with the server's address.
1178
1246
1179
1247
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
1249
https://bugs.debian.org/587961
1182
1250
*/
1183
1251
if(debug){
1363
1431
&decrypted_buffer, mc);
1364
1432
if(decrypted_buffer_size >= 0){
1365
1433
1434
clearerr(stdout);
1366
1435
written = 0;
1367
1436
while(written < (size_t) decrypted_buffer_size){
1368
1437
if(quit_now){
1384
1453
}
1385
1454
written += (size_t)ret;
1386
1455
}
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
}
1387
1466
retval = 0;
1388
1467
}
1389
1468
}
1402
1481
free(decrypted_buffer);
1403
1482
free(buffer);
1404
1483
if(tcp_sd >= 0){
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1484
ret = close(tcp_sd);
1406
1485
}
1407
1486
if(ret == -1){
1408
1487
if(e == 0){
1420
1499
return retval;
1421
1500
}
1422
1501
1423
__attribute__((nonnull))
1424
1502
static void resolve_callback(AvahiSServiceResolver *r,
1425
1503
AvahiIfIndex interface,
1426
1504
AvahiProtocol proto,
1563
1641
__attribute__((nonnull, warn_unused_result))
1564
1642
bool get_flags(const char *ifname, struct ifreq *ifr){
1565
1643
int ret;
1566
error_t ret_errno;
1644
int old_errno;
1567
1645
1568
1646
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1569
1647
if(s < 0){
1570
ret_errno = errno;
1648
old_errno = errno;
1571
1649
perror_plus("socket");
1572
errno = ret_errno;
1650
errno = old_errno;
1573
1651
return false;
1574
1652
}
1575
strcpy(ifr->ifr_name, ifname);
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1576
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1577
1656
if(ret == -1){
1578
1657
if(debug){
1579
ret_errno = errno;
1658
old_errno = errno;
1580
1659
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1582
1666
}
1583
1667
return false;
1584
1668
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1585
1674
return true;
1586
1675
}
1587
1676
1848
1937
return;
1849
1938
}
1850
1939
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
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
}
1853
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
1946
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1857
alphasort);
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1861
alphasort);
1862
#endif /* not __GLIBC__ */
1863
1947
if(numhooks == -1){
1864
1948
perror_plus("scandir");
1949
close(devnull);
1865
1950
return;
1866
1951
}
1867
1952
struct dirent *direntry;
1868
1953
int ret;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1870
if(devnull == -1){
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1872
return;
1873
}
1874
1954
for(int i = 0; i < numhooks; i++){
1875
1955
direntry = direntries[i];
1876
1956
if(debug){
1947
2027
perror_plus("openat");
1948
2028
_exit(EXIT_FAILURE);
1949
2029
}
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2030
if(close(hookdir_fd) == -1){
1951
2031
perror_plus("close");
1952
2032
_exit(EXIT_FAILURE);
1953
2033
}
1956
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
1957
2037
_exit(EX_OSERR);
1958
2038
}
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2039
ret = close(devnull);
1960
2040
if(ret == -1){
1961
2041
perror_plus("close");
1962
2042
_exit(EX_OSERR);
2011
2091
free(direntry);
2012
2092
}
2013
2093
free(direntries);
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2094
if(close(hookdir_fd) == -1){
2015
2095
perror_plus("close");
2016
2096
} else {
2017
2097
hookdir_fd = -1;
2020
2100
}
2021
2101
2022
2102
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2024
const float delay){
2025
error_t old_errno = errno;
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2026
2106
int ret;
2027
2107
struct ifreq network;
2028
2108
unsigned int if_index = if_nametoindex(interface);
2038
2118
}
2039
2119
2040
2120
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2042
2123
if(not get_flags(interface, &network)){
2043
2124
ret_errno = errno;
2044
2125
fprintf_plus(stderr, "Failed to get flags for interface "
2057
2138
}
2058
2139
2059
2140
if(quit_now){
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2141
ret = close(sd);
2061
2142
if(ret == -1){
2062
2143
perror_plus("close");
2063
2144
}
2113
2194
}
2114
2195
2115
2196
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2197
ret = close(sd);
2117
2198
if(ret == -1){
2118
2199
perror_plus("close");
2119
2200
}
2131
2212
2132
2213
/* Sleep checking until interface is running.
2133
2214
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2215
for(int i = 0; i < delay * 4; i++){
2135
2216
if(interface_is_running(interface)){
2136
2217
break;
2137
2218
}
2147
2228
}
2148
2229
2149
2230
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2152
2233
struct ifreq network;
2153
2234
unsigned int if_index = if_nametoindex(interface);
2154
2235
if(if_index == 0){
2157
2238
return ENXIO;
2158
2239
}
2159
2240
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2161
2243
if(not get_flags(interface, &network) and debug){
2162
2244
ret_errno = errno;
2163
2245
fprintf_plus(stderr, "Failed to get flags for interface "
2201
2283
}
2202
2284
2203
2285
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
int ret = close(sd);
2205
2287
if(ret == -1){
2206
2288
perror_plus("close");
2207
2289
}
2223
2305
2224
2306
int main(int argc, char *argv[]){
2225
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
2229
2312
AvahiSServiceBrowser *sb = NULL;
2230
2313
error_t ret_errno;
2231
2314
int ret;
2240
2323
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
2324
const char *seckey = PATHDIR "/" SECKEY;
2242
2325
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2243
2327
char *interfaces_hooks = NULL;
2244
2328
2245
2329
bool gnutls_initialized = false;
2298
2382
.doc = "Bit length of the prime number used in the"
2299
2383
" Diffie-Hellman key exchange",
2300
2384
.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 },
2301
2390
{ .name = "priority", .key = 130,
2302
2391
.arg = "STRING",
2303
2392
.doc = "GnuTLS priority string for the TLS handshake",
2358
2447
}
2359
2448
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2360
2449
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2361
2453
case 130: /* --priority */
2362
2454
mc.priority = arg;
2363
2455
break;
2403
2495
.args_doc = "",
2404
2496
.doc = "Mandos client -- Get and decrypt"
2405
2497
" passwords from a Mandos server" };
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2408
switch(ret){
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2409
2501
case 0:
2410
2502
break;
2411
2503
case ENOMEM:
2412
2504
default:
2413
errno = ret;
2505
errno = ret_errno;
2414
2506
perror_plus("argp_parse");
2415
2507
exitcode = EX_OSERR;
2416
2508
goto end;
2422
2514
2423
2515
{
2424
2516
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2517
<https://bugs.debian.org/633582> */
2426
2518
2427
2519
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2431
2523
perror_plus("Failed to raise privileges");
2432
2524
} else {
2433
2525
struct stat st;
2449
2541
}
2450
2542
}
2451
2543
}
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2544
close(seckey_fd);
2453
2545
}
2454
2546
}
2455
2547
2470
2562
}
2471
2563
}
2472
2564
}
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
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);
2474
2588
}
2475
2589
}
2476
2590
2477
2591
/* Lower privileges */
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2481
2595
perror_plus("Failed to lower privileges");
2482
2596
}
2483
2597
}
2653
2767
errno = bring_up_interface(interface, delay);
2654
2768
if(not interface_was_up){
2655
2769
if(errno != 0){
2656
perror_plus("Failed to bring up interface");
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2657
2772
} else {
2658
2773
errno = argz_add(&interfaces_to_take_down,
2659
2774
&interfaces_to_take_down_size,
2682
2797
goto end;
2683
2798
}
2684
2799
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2686
2801
if(ret == -1){
2687
2802
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
2803
exitcode = EX_UNAVAILABLE;
2810
2925
2811
2926
/* Allocate a new server */
2812
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
2928
&config, NULL, NULL, &ret);
2814
2929
2815
2930
/* Free the Avahi configuration data */
2816
2931
avahi_server_config_free(&config);
2819
2934
/* Check if creating the Avahi server object succeeded */
2820
2935
if(mc.server == NULL){
2821
2936
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
2937
avahi_strerror(ret));
2823
2938
exitcode = EX_UNAVAILABLE;
2824
2939
goto end;
2825
2940
}
2860
2975
end:
2861
2976
2862
2977
if(debug){
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
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
}
2864
2985
}
2865
2986
2866
2987
/* Cleanup things */
2877
2998
2878
2999
if(gnutls_initialized){
2879
3000
gnutls_certificate_free_credentials(mc.cred);
2880
gnutls_global_deinit();
2881
3001
gnutls_dh_params_deinit(mc.dh_params);
2882
3002
}
2883
3003
2906
3026
2907
3027
/* Re-raise privileges */
2908
3028
{
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
2912
3032
perror_plus("Failed to raise privileges");
2913
3033
} else {
2914
3034
2919
3039
/* Take down the network interfaces which were brought up */
2920
3040
{
2921
3041
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2924
interface))){
2925
ret_errno = take_down_interface(interface);
2926
if(ret_errno != 0){
2927
errno = ret_errno;
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;
2928
3048
perror_plus("Failed to take down interface");
2929
3049
}
2930
3050
}
2935
3055
}
2936
3056
}
2937
3057
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
2941
3061
perror_plus("Failed to lower privileges permanently");
2942
3062
}
2943
3063
}
2945
3065
free(interfaces_to_take_down);
2946
3066
free(interfaces_hooks);
2947
3067
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
2948
3122
/* Removes the GPGME temp directory and all files inside */
2949
3123
if(tempdir != NULL){
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2952
| O_NOFOLLOW
2953
| O_DIRECTORY
2954
| O_PATH));
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2957
} else {
2958
#ifdef __GLIBC__
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2964
alphasort);
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2968
alphasort);
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2973
if(ret == -1){
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2977
}
2978
free(direntries[i]);
2979
}
2980
2981
/* need to clean even if 0 because man page doesn't specify */
2982
free(direntries);
2983
if(numentries == -1){
2984
perror_plus("scandir");
2985
}
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2989
}
2990
}
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
2992
}
3124
clean_dir_at(-1, tempdir, 0);
2993
3125
}
2994
3126
2995
3127
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0