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- Committer: Teddy Hogeborn
- Date: 2018-02-19 21:32:07 UTC
- Revision ID: teddy@recompile.se-20180219213207-0un0ylegx390pftq
Client bug fixes: Fix file descriptor leaks
* plugin-helpers/mandos-client.c (init_gnutls_global, get_flags):
Always close files and sockets after they are used.
* plugin-helpers/mandos-client.c (init_gnutls_global, get_flags):
Always close files and sockets after they are used.
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
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
627
680
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
629
683
safer_gnutls_strerror(ret));
630
privkey = NULL;
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
631
708
}
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
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
644
718
}
645
719
}
646
720
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
650
724
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
653
727
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
728
(sec_param)),
729
mc->dh_bits);
655
730
}
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",
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
664
734
safe_string(gnutls_sec_param_get_name
665
735
(sec_param)),
666
mc->dh_bits);
736
safer_gnutls_strerror(ret));
737
goto globalfail;
667
738
}
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)),
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
672
747
safer_gnutls_strerror(ret));
673
748
goto globalfail;
674
749
}
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
750
}
686
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
687
752
688
753
return 0;
690
755
globalfail:
691
756
692
757
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
694
758
gnutls_dh_params_deinit(mc->dh_params);
695
759
return -1;
696
760
}
748
812
/* ignore client certificate if any. */
749
813
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
814
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
753
815
return 0;
754
816
}
755
817
759
821
760
822
/* Set effective uid to 0, return errno */
761
823
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
765
827
if(seteuid(0) == -1){
766
ret_errno = errno;
828
ret = errno;
767
829
}
768
830
errno = old_errno;
769
return ret_errno;
831
return ret;
770
832
}
771
833
772
834
/* Set effective and real user ID to 0. Return errno. */
773
835
__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){
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
778
840
errno = old_errno;
779
return ret_errno;
841
return ret;
780
842
}
781
843
if(setuid(0) == -1){
782
ret_errno = errno;
844
ret = errno;
783
845
}
784
846
errno = old_errno;
785
return ret_errno;
847
return ret;
786
848
}
787
849
788
850
/* Set effective user ID to unprivileged saved user ID */
789
851
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
793
855
if(seteuid(uid) == -1){
794
ret_errno = errno;
856
ret = errno;
795
857
}
796
858
errno = old_errno;
797
return ret_errno;
859
return ret;
798
860
}
799
861
800
862
/* Lower privileges permanently */
801
863
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
805
867
if(setuid(uid) == -1){
806
ret_errno = errno;
868
ret = errno;
807
869
}
808
870
errno = old_errno;
809
return ret_errno;
871
return ret;
810
872
}
811
873
812
874
/* Helper function to add_local_route() and delete_local_route() */
868
930
perror_plus("dup2(devnull, STDIN_FILENO)");
869
931
_exit(EX_OSERR);
870
932
}
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
933
ret = close(devnull);
872
934
if(ret == -1){
873
935
perror_plus("close");
874
936
_exit(EX_OSERR);
891
953
helper, O_RDONLY));
892
954
if(helper_fd == -1){
893
955
perror_plus("openat");
956
close(helperdir_fd);
894
957
_exit(EX_UNAVAILABLE);
895
958
}
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
959
close(helperdir_fd);
897
960
#ifdef __GNUC__
898
961
#pragma GCC diagnostic push
899
962
#pragma GCC diagnostic ignored "-Wcast-qual"
1018
1081
bool match = false;
1019
1082
{
1020
1083
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
1023
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1024
1088
match = true;
1025
1089
break;
1067
1131
goto mandos_end;
1068
1132
}
1069
1133
1070
memset(&to, 0, sizeof(to));
1071
1134
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);
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
1074
1138
} 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);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
1077
1142
}
1078
1143
if(ret < 0 ){
1079
1144
int e = errno;
1158
1223
sizeof(struct sockaddr_in));
1159
1224
}
1160
1225
if(ret < 0){
1161
if(errno == ENETUNREACH
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1162
1227
and if_index != AVAHI_IF_UNSPEC
1163
1228
and connect_to == NULL
1164
1229
and not route_added and
1177
1242
with an explicit route added with the server's address.
1178
1243
1179
1244
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
1246
https://bugs.debian.org/587961
1182
1247
*/
1183
1248
if(debug){
1363
1428
&decrypted_buffer, mc);
1364
1429
if(decrypted_buffer_size >= 0){
1365
1430
1431
clearerr(stdout);
1366
1432
written = 0;
1367
1433
while(written < (size_t) decrypted_buffer_size){
1368
1434
if(quit_now){
1384
1450
}
1385
1451
written += (size_t)ret;
1386
1452
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
1387
1463
retval = 0;
1388
1464
}
1389
1465
}
1402
1478
free(decrypted_buffer);
1403
1479
free(buffer);
1404
1480
if(tcp_sd >= 0){
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
ret = close(tcp_sd);
1406
1482
}
1407
1483
if(ret == -1){
1408
1484
if(e == 0){
1420
1496
return retval;
1421
1497
}
1422
1498
1423
__attribute__((nonnull))
1424
1499
static void resolve_callback(AvahiSServiceResolver *r,
1425
1500
AvahiIfIndex interface,
1426
1501
AvahiProtocol proto,
1563
1638
__attribute__((nonnull, warn_unused_result))
1564
1639
bool get_flags(const char *ifname, struct ifreq *ifr){
1565
1640
int ret;
1566
error_t ret_errno;
1641
int old_errno;
1567
1642
1568
1643
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1569
1644
if(s < 0){
1570
ret_errno = errno;
1645
old_errno = errno;
1571
1646
perror_plus("socket");
1572
errno = ret_errno;
1647
errno = old_errno;
1573
1648
return false;
1574
1649
}
1575
strcpy(ifr->ifr_name, ifname);
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1576
1652
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1577
1653
if(ret == -1){
1578
1654
if(debug){
1579
ret_errno = errno;
1655
old_errno = errno;
1580
1656
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1657
errno = old_errno;
1582
1658
}
1659
close(s);
1583
1660
return false;
1584
1661
}
1662
close(s);
1585
1663
return true;
1586
1664
}
1587
1665
1848
1926
return;
1849
1927
}
1850
1928
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1853
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
1935
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
1936
if(numhooks == -1){
1864
1937
perror_plus("scandir");
1938
close(devnull);
1865
1939
return;
1866
1940
}
1867
1941
struct dirent *direntry;
1868
1942
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
1943
for(int i = 0; i < numhooks; i++){
1875
1944
direntry = direntries[i];
1876
1945
if(debug){
1947
2016
perror_plus("openat");
1948
2017
_exit(EXIT_FAILURE);
1949
2018
}
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2019
if(close(hookdir_fd) == -1){
1951
2020
perror_plus("close");
1952
2021
_exit(EXIT_FAILURE);
1953
2022
}
1956
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
1957
2026
_exit(EX_OSERR);
1958
2027
}
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2028
ret = close(devnull);
1960
2029
if(ret == -1){
1961
2030
perror_plus("close");
1962
2031
_exit(EX_OSERR);
2011
2080
free(direntry);
2012
2081
}
2013
2082
free(direntries);
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2083
if(close(hookdir_fd) == -1){
2015
2084
perror_plus("close");
2016
2085
} else {
2017
2086
hookdir_fd = -1;
2020
2089
}
2021
2090
2022
2091
__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;
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2026
2095
int ret;
2027
2096
struct ifreq network;
2028
2097
unsigned int if_index = if_nametoindex(interface);
2038
2107
}
2039
2108
2040
2109
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2042
2112
if(not get_flags(interface, &network)){
2043
2113
ret_errno = errno;
2044
2114
fprintf_plus(stderr, "Failed to get flags for interface "
2057
2127
}
2058
2128
2059
2129
if(quit_now){
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2130
ret = close(sd);
2061
2131
if(ret == -1){
2062
2132
perror_plus("close");
2063
2133
}
2113
2183
}
2114
2184
2115
2185
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2186
ret = close(sd);
2117
2187
if(ret == -1){
2118
2188
perror_plus("close");
2119
2189
}
2131
2201
2132
2202
/* Sleep checking until interface is running.
2133
2203
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2204
for(int i = 0; i < delay * 4; i++){
2135
2205
if(interface_is_running(interface)){
2136
2206
break;
2137
2207
}
2147
2217
}
2148
2218
2149
2219
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
2152
2222
struct ifreq network;
2153
2223
unsigned int if_index = if_nametoindex(interface);
2154
2224
if(if_index == 0){
2157
2227
return ENXIO;
2158
2228
}
2159
2229
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
2161
2232
if(not get_flags(interface, &network) and debug){
2162
2233
ret_errno = errno;
2163
2234
fprintf_plus(stderr, "Failed to get flags for interface "
2201
2272
}
2202
2273
2203
2274
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2275
int ret = close(sd);
2205
2276
if(ret == -1){
2206
2277
perror_plus("close");
2207
2278
}
2223
2294
2224
2295
int main(int argc, char *argv[]){
2225
2296
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 };
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
2229
2301
AvahiSServiceBrowser *sb = NULL;
2230
2302
error_t ret_errno;
2231
2303
int ret;
2240
2312
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
2313
const char *seckey = PATHDIR "/" SECKEY;
2242
2314
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2243
2316
char *interfaces_hooks = NULL;
2244
2317
2245
2318
bool gnutls_initialized = false;
2298
2371
.doc = "Bit length of the prime number used in the"
2299
2372
" Diffie-Hellman key exchange",
2300
2373
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
2301
2379
{ .name = "priority", .key = 130,
2302
2380
.arg = "STRING",
2303
2381
.doc = "GnuTLS priority string for the TLS handshake",
2358
2436
}
2359
2437
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2360
2438
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
2361
2442
case 130: /* --priority */
2362
2443
mc.priority = arg;
2363
2444
break;
2403
2484
.args_doc = "",
2404
2485
.doc = "Mandos client -- Get and decrypt"
2405
2486
" passwords from a Mandos server" };
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2408
switch(ret){
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
2409
2490
case 0:
2410
2491
break;
2411
2492
case ENOMEM:
2412
2493
default:
2413
errno = ret;
2494
errno = ret_errno;
2414
2495
perror_plus("argp_parse");
2415
2496
exitcode = EX_OSERR;
2416
2497
goto end;
2422
2503
2423
2504
{
2424
2505
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2506
<https://bugs.debian.org/633582> */
2426
2507
2427
2508
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2431
2512
perror_plus("Failed to raise privileges");
2432
2513
} else {
2433
2514
struct stat st;
2449
2530
}
2450
2531
}
2451
2532
}
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2533
close(seckey_fd);
2453
2534
}
2454
2535
}
2455
2536
2470
2551
}
2471
2552
}
2472
2553
}
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2474
2577
}
2475
2578
}
2476
2579
2477
2580
/* Lower privileges */
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2481
2584
perror_plus("Failed to lower privileges");
2482
2585
}
2483
2586
}
2653
2756
errno = bring_up_interface(interface, delay);
2654
2757
if(not interface_was_up){
2655
2758
if(errno != 0){
2656
perror_plus("Failed to bring up interface");
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2657
2761
} else {
2658
2762
errno = argz_add(&interfaces_to_take_down,
2659
2763
&interfaces_to_take_down_size,
2682
2786
goto end;
2683
2787
}
2684
2788
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2686
2790
if(ret == -1){
2687
2791
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
2792
exitcode = EX_UNAVAILABLE;
2810
2914
2811
2915
/* Allocate a new server */
2812
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
2917
&config, NULL, NULL, &ret);
2814
2918
2815
2919
/* Free the Avahi configuration data */
2816
2920
avahi_server_config_free(&config);
2819
2923
/* Check if creating the Avahi server object succeeded */
2820
2924
if(mc.server == NULL){
2821
2925
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
2926
avahi_strerror(ret));
2823
2927
exitcode = EX_UNAVAILABLE;
2824
2928
goto end;
2825
2929
}
2860
2964
end:
2861
2965
2862
2966
if(debug){
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2864
2974
}
2865
2975
2866
2976
/* Cleanup things */
2877
2987
2878
2988
if(gnutls_initialized){
2879
2989
gnutls_certificate_free_credentials(mc.cred);
2880
gnutls_global_deinit();
2881
2990
gnutls_dh_params_deinit(mc.dh_params);
2882
2991
}
2883
2992
2906
3015
2907
3016
/* Re-raise privileges */
2908
3017
{
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
2912
3021
perror_plus("Failed to raise privileges");
2913
3022
} else {
2914
3023
2919
3028
/* Take down the network interfaces which were brought up */
2920
3029
{
2921
3030
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;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
2928
3037
perror_plus("Failed to take down interface");
2929
3038
}
2930
3039
}
2935
3044
}
2936
3045
}
2937
3046
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
2941
3050
perror_plus("Failed to lower privileges permanently");
2942
3051
}
2943
3052
}
2945
3054
free(interfaces_to_take_down);
2946
3055
free(interfaces_hooks);
2947
3056
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
3059
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
3109
}
3110
2948
3111
/* Removes the GPGME temp directory and all files inside */
2949
3112
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
}
3113
clean_dir_at(-1, tempdir, 0);
2993
3114
}
2994
3115
2995
3116
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0