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- Committer: Teddy Hogeborn
- Date: 2015-07-02 18:22:22 UTC
- mto: This revision was merged to the branch mainline in revision 759.
- Revision ID: teddy@recompile.se-20150702182222-034v03mb8orwhezn
mandos-client: Minor changes to check for more error conditions.
* mandos-client.c (add_remove_local_route): Do TEMP_FAILURE_RETRY
around closing of
/dev/null. Check return
value when opening helper
directory and helper
executable.
(run_network_hooks): Cast return value of TEMP_FAILURE_RETRY to int.
Do TEMP_FAILURE_RETRY around closing of
/dev/null.
* mandos-client.c (add_remove_local_route): Do TEMP_FAILURE_RETRY
around closing of
/dev/null. Check return
value when opening helper
directory and helper
executable.
(run_network_hooks): Cast return value of TEMP_FAILURE_RETRY to int.
Do TEMP_FAILURE_RETRY around closing of
/dev/null.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
58
inet_pton(), connect(),
60
59
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
62
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
62
*/
64
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
64
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
310
305
return false;
311
306
}
312
307
313
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
309
if(ret == -1){
315
310
perror_plus("close");
316
311
}
498
493
return plaintext_length;
499
494
}
500
495
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
496
__attribute__((warn_unused_result))
509
497
static const char *safer_gnutls_strerror(int value){
510
498
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
499
if(ret == NULL)
500
ret = "(unknown)";
501
return ret;
512
502
}
513
503
514
504
/* GnuTLS log function callback */
518
508
fprintf_plus(stderr, "GnuTLS: %s", string);
519
509
}
520
510
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
511
__attribute__((nonnull, warn_unused_result))
522
512
static int init_gnutls_global(const char *pubkeyfilename,
523
513
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
514
mandos_context *mc){
526
515
int ret;
527
unsigned int uret;
528
516
529
517
if(debug){
530
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
519
}
532
520
521
ret = gnutls_global_init();
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
525
return -1;
526
}
527
533
528
if(debug){
534
529
/* "Use a log level over 10 to enable all debugging options."
535
530
* - GnuTLS manual
543
538
if(ret != GNUTLS_E_SUCCESS){
544
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
540
safer_gnutls_strerror(ret));
541
gnutls_global_deinit();
546
542
return -1;
547
543
}
548
544
573
569
safer_gnutls_strerror(ret));
574
570
goto globalfail;
575
571
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
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
749
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
750
580
751
581
return 0;
753
583
globalfail:
754
584
755
585
gnutls_certificate_free_credentials(mc->cred);
586
gnutls_global_deinit();
756
587
gnutls_dh_params_deinit(mc->dh_params);
757
588
return -1;
758
589
}
810
641
/* ignore client certificate if any. */
811
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
643
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
813
646
return 0;
814
647
}
815
648
819
652
820
653
/* Set effective uid to 0, return errno */
821
654
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
825
658
if(seteuid(0) == -1){
826
ret = errno;
659
ret_errno = errno;
827
660
}
828
661
errno = old_errno;
829
return ret;
662
return ret_errno;
830
663
}
831
664
832
665
/* Set effective and real user ID to 0. Return errno. */
833
666
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
838
671
errno = old_errno;
839
return ret;
672
return ret_errno;
840
673
}
841
674
if(setuid(0) == -1){
842
ret = errno;
675
ret_errno = errno;
843
676
}
844
677
errno = old_errno;
845
return ret;
678
return ret_errno;
846
679
}
847
680
848
681
/* Set effective user ID to unprivileged saved user ID */
849
682
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
853
686
if(seteuid(uid) == -1){
854
ret = errno;
687
ret_errno = errno;
855
688
}
856
689
errno = old_errno;
857
return ret;
690
return ret_errno;
858
691
}
859
692
860
693
/* Lower privileges permanently */
861
694
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
865
698
if(setuid(uid) == -1){
866
ret = errno;
699
ret_errno = errno;
867
700
}
868
701
errno = old_errno;
869
return ret;
702
return ret_errno;
870
703
}
871
704
872
/* Helper function to add_local_route() and delete_local_route() */
705
/* Helper function to add_local_route() and remove_local_route() */
873
706
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
707
static bool add_remove_local_route(const bool add,
875
708
const char *address,
876
709
AvahiIfIndex if_index){
877
710
int ret;
878
711
char helper[] = "mandos-client-iprouteadddel";
879
712
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
713
char remove_arg[] = "remove";
882
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
715
if(pluginhelperdir == NULL){
884
716
if(debug){
928
760
perror_plus("dup2(devnull, STDIN_FILENO)");
929
761
_exit(EX_OSERR);
930
762
}
931
ret = close(devnull);
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
932
764
if(ret == -1){
933
765
perror_plus("close");
934
766
_exit(EX_OSERR);
951
783
helper, O_RDONLY));
952
784
if(helper_fd == -1){
953
785
perror_plus("openat");
954
close(helperdir_fd);
955
786
_exit(EX_UNAVAILABLE);
956
787
}
957
close(helperdir_fd);
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
958
789
#ifdef __GNUC__
959
790
#pragma GCC diagnostic push
960
791
#pragma GCC diagnostic ignored "-Wcast-qual"
961
792
#endif
962
793
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
794
{ helper, add ? add_arg : remove_arg, (char *)address,
795
interface, NULL }, environ) == -1){
966
796
#ifdef __GNUC__
967
797
#pragma GCC diagnostic pop
968
798
#endif
1020
850
__attribute__((nonnull, warn_unused_result))
1021
851
static bool add_local_route(const char *address,
1022
852
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
853
return add_remove_local_route(true, address, if_index);
1027
854
}
1028
855
1029
856
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
857
static bool remove_local_route(const char *address,
1031
858
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
859
return add_remove_local_route(false, address, if_index);
1036
860
}
1037
861
1038
862
/* Called when a Mandos server is found */
1079
903
bool match = false;
1080
904
{
1081
905
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
1085
908
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
909
match = true;
1087
910
break;
1129
952
goto mandos_end;
1130
953
}
1131
954
955
memset(&to, 0, sizeof(to));
1132
956
if(af == AF_INET6){
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1136
959
} else { /* IPv4 */
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1140
962
}
1141
963
if(ret < 0 ){
1142
964
int e = errno;
1221
1043
sizeof(struct sockaddr_in));
1222
1044
}
1223
1045
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1046
if(errno == ENETUNREACH
1225
1047
and if_index != AVAHI_IF_UNSPEC
1226
1048
and connect_to == NULL
1227
1049
and not route_added and
1240
1062
with an explicit route added with the server's address.
1241
1063
1242
1064
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
1066
https://bugs.debian.org/587961
1245
1067
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
1068
int e = errno;
1251
1069
route_added = add_local_route(ip, if_index);
1252
1070
if(route_added){
1426
1244
&decrypted_buffer, mc);
1427
1245
if(decrypted_buffer_size >= 0){
1428
1246
1429
clearerr(stdout);
1430
1247
written = 0;
1431
1248
while(written < (size_t) decrypted_buffer_size){
1432
1249
if(quit_now){
1448
1265
}
1449
1266
written += (size_t)ret;
1450
1267
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
1461
1268
retval = 0;
1462
1269
}
1463
1270
}
1467
1274
mandos_end:
1468
1275
{
1469
1276
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1472
1279
" interface %d", ip, if_index);
1473
1280
}
1474
1281
}
1476
1283
free(decrypted_buffer);
1477
1284
free(buffer);
1478
1285
if(tcp_sd >= 0){
1479
ret = close(tcp_sd);
1286
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
1287
}
1481
1288
if(ret == -1){
1482
1289
if(e == 0){
1637
1444
__attribute__((nonnull, warn_unused_result))
1638
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1446
int ret;
1640
int old_errno;
1447
error_t ret_errno;
1641
1448
1642
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1450
if(s < 0){
1644
old_errno = errno;
1451
ret_errno = errno;
1645
1452
perror_plus("socket");
1646
errno = old_errno;
1453
errno = ret_errno;
1647
1454
return false;
1648
1455
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1456
strcpy(ifr->ifr_name, ifname);
1651
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1458
if(ret == -1){
1653
1459
if(debug){
1654
old_errno = errno;
1460
ret_errno = errno;
1655
1461
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1462
errno = ret_errno;
1657
1463
}
1658
1464
return false;
1659
1465
}
1923
1729
return;
1924
1730
}
1925
1731
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1926
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1928
1744
if(numhooks == -1){
1929
1745
perror_plus("scandir");
1930
1746
return;
2012
1828
perror_plus("openat");
2013
1829
_exit(EXIT_FAILURE);
2014
1830
}
2015
if(close(hookdir_fd) == -1){
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2016
1832
perror_plus("close");
2017
1833
_exit(EXIT_FAILURE);
2018
1834
}
2021
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
1838
_exit(EX_OSERR);
2023
1839
}
2024
ret = close(devnull);
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2025
1841
if(ret == -1){
2026
1842
perror_plus("close");
2027
1843
_exit(EX_OSERR);
2076
1892
free(direntry);
2077
1893
}
2078
1894
free(direntries);
2079
if(close(hookdir_fd) == -1){
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2080
1896
perror_plus("close");
2081
1897
} else {
2082
1898
hookdir_fd = -1;
2085
1901
}
2086
1902
2087
1903
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
2091
1907
int ret;
2092
1908
struct ifreq network;
2093
1909
unsigned int if_index = if_nametoindex(interface);
2103
1919
}
2104
1920
2105
1921
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
1922
error_t ret_errno = 0, ioctl_errno = 0;
2108
1923
if(not get_flags(interface, &network)){
2109
1924
ret_errno = errno;
2110
1925
fprintf_plus(stderr, "Failed to get flags for interface "
2123
1938
}
2124
1939
2125
1940
if(quit_now){
2126
ret = close(sd);
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2127
1942
if(ret == -1){
2128
1943
perror_plus("close");
2129
1944
}
2179
1994
}
2180
1995
2181
1996
/* Close the socket */
2182
ret = close(sd);
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1998
if(ret == -1){
2184
1999
perror_plus("close");
2185
2000
}
2197
2012
2198
2013
/* Sleep checking until interface is running.
2199
2014
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2015
for(int i=0; i < delay * 4; i++){
2201
2016
if(interface_is_running(interface)){
2202
2017
break;
2203
2018
}
2213
2028
}
2214
2029
2215
2030
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2218
2033
struct ifreq network;
2219
2034
unsigned int if_index = if_nametoindex(interface);
2220
2035
if(if_index == 0){
2223
2038
return ENXIO;
2224
2039
}
2225
2040
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2041
error_t ret_errno = 0, ioctl_errno = 0;
2228
2042
if(not get_flags(interface, &network) and debug){
2229
2043
ret_errno = errno;
2230
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2268
2082
}
2269
2083
2270
2084
/* Close the socket */
2271
int ret = close(sd);
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2272
2086
if(ret == -1){
2273
2087
perror_plus("close");
2274
2088
}
2289
2103
}
2290
2104
2291
2105
int main(int argc, char *argv[]){
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 };
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 };
2297
2110
AvahiSServiceBrowser *sb = NULL;
2298
2111
error_t ret_errno;
2299
2112
int ret;
2308
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2309
2122
const char *seckey = PATHDIR "/" SECKEY;
2310
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
2124
char *interfaces_hooks = NULL;
2313
2125
2314
2126
bool gnutls_initialized = false;
2367
2179
.doc = "Bit length of the prime number used in the"
2368
2180
" Diffie-Hellman key exchange",
2369
2181
.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 },
2375
2182
{ .name = "priority", .key = 130,
2376
2183
.arg = "STRING",
2377
2184
.doc = "GnuTLS priority string for the TLS handshake",
2432
2239
}
2433
2240
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2434
2241
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2438
2242
case 130: /* --priority */
2439
2243
mc.priority = arg;
2440
2244
break;
2480
2284
.args_doc = "",
2481
2285
.doc = "Mandos client -- Get and decrypt"
2482
2286
" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
2287
ret = argp_parse(&argp, argc, argv,
2288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2289
switch(ret){
2486
2290
case 0:
2487
2291
break;
2488
2292
case ENOMEM:
2489
2293
default:
2490
errno = ret_errno;
2294
errno = ret;
2491
2295
perror_plus("argp_parse");
2492
2296
exitcode = EX_OSERR;
2493
2297
goto end;
2499
2303
2500
2304
{
2501
2305
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
2306
<http://bugs.debian.org/633582> */
2503
2307
2504
2308
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2508
2312
perror_plus("Failed to raise privileges");
2509
2313
} else {
2510
2314
struct stat st;
2526
2330
}
2527
2331
}
2528
2332
}
2529
close(seckey_fd);
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2530
2334
}
2531
2335
}
2532
2336
2547
2351
}
2548
2352
}
2549
2353
}
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);
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2573
2355
}
2574
2356
}
2575
2357
2576
2358
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2580
2362
perror_plus("Failed to lower privileges");
2581
2363
}
2582
2364
}
2752
2534
errno = bring_up_interface(interface, delay);
2753
2535
if(not interface_was_up){
2754
2536
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2537
perror_plus("Failed to bring up interface");
2757
2538
} else {
2758
2539
errno = argz_add(&interfaces_to_take_down,
2759
2540
&interfaces_to_take_down_size,
2782
2563
goto end;
2783
2564
}
2784
2565
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
2786
2567
if(ret == -1){
2787
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
2788
2569
exitcode = EX_UNAVAILABLE;
2910
2691
2911
2692
/* Allocate a new server */
2912
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2694
&config, NULL, NULL, &ret_errno);
2914
2695
2915
2696
/* Free the Avahi configuration data */
2916
2697
avahi_server_config_free(&config);
2919
2700
/* Check if creating the Avahi server object succeeded */
2920
2701
if(mc.server == NULL){
2921
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2703
avahi_strerror(ret_errno));
2923
2704
exitcode = EX_UNAVAILABLE;
2924
2705
goto end;
2925
2706
}
2960
2741
end:
2961
2742
2962
2743
if(debug){
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
}
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
2745
}
2971
2746
2972
2747
/* Cleanup things */
2983
2758
2984
2759
if(gnutls_initialized){
2985
2760
gnutls_certificate_free_credentials(mc.cred);
2761
gnutls_global_deinit();
2986
2762
gnutls_dh_params_deinit(mc.dh_params);
2987
2763
}
2988
2764
3011
2787
3012
2788
/* Re-raise privileges */
3013
2789
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
3017
2793
perror_plus("Failed to raise privileges");
3018
2794
} else {
3019
2795
3024
2800
/* Take down the network interfaces which were brought up */
3025
2801
{
3026
2802
char *interface = NULL;
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;
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;
3033
2809
perror_plus("Failed to take down interface");
3034
2810
}
3035
2811
}
3040
2816
}
3041
2817
}
3042
2818
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
3046
2822
perror_plus("Failed to lower privileges permanently");
3047
2823
}
3048
2824
}
3050
2826
free(interfaces_to_take_down);
3051
2827
free(interfaces_hooks);
3052
2828
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
3109
2829
/* Removes the GPGME temp directory and all files inside */
3110
2830
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2831
struct dirent **direntries = NULL;
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2871
}
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2873
}
3112
2874
}
3113
2875
3114
2876
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0