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- Committer: Teddy Hogeborn
- Date: 2017-08-20 13:54:01 UTC
- Revision ID: teddy@recompile.se-20170820135401-nbm84h6hhyy40dr2
Bug fix: Detect failure of ssh-keyscan in mandos-keygen --password.
* mandos-keygen: Detect failure of ssh-keyscan in --password mode.
* mandos-keygen: Detect failure of ssh-keyscan in --password mode.
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
12
* Copyright © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 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> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
59
inet_pton(), connect(),
59
60
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
63
*/
63
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
65
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
305
310
return false;
306
311
}
307
312
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
309
314
if(ret == -1){
310
315
perror_plus("close");
311
316
}
513
518
fprintf_plus(stderr, "GnuTLS: %s", string);
514
519
}
515
520
516
__attribute__((nonnull, warn_unused_result))
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
522
static int init_gnutls_global(const char *pubkeyfilename,
518
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
519
525
mandos_context *mc){
520
526
int ret;
521
527
unsigned int uret;
524
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
525
531
}
526
532
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
533
if(debug){
535
534
/* "Use a log level over 10 to enable all debugging options."
536
535
* - GnuTLS manual
544
543
if(ret != GNUTLS_E_SUCCESS){
545
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
545
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
548
546
return -1;
549
547
}
550
548
575
573
safer_gnutls_strerror(ret));
576
574
goto globalfail;
577
575
}
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;
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;
585
587
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
590
592
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
593
596
break;
594
597
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
596
600
BUFFER_SIZE);
597
601
/* EOF */
598
602
if(bytes_read == 0){
601
605
/* check bytes_read for failure */
602
606
if(bytes_read < 0){
603
607
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);
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);
627
678
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
629
681
safer_gnutls_strerror(ret));
630
privkey = NULL;
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
}
631
706
}
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
}
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)));
644
716
}
645
717
}
646
718
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
650
722
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
653
725
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
726
(sec_param)),
727
mc->dh_bits);
655
728
}
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",
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
664
732
safe_string(gnutls_sec_param_get_name
665
733
(sec_param)),
666
mc->dh_bits);
734
safer_gnutls_strerror(ret));
735
goto globalfail;
667
736
}
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)),
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,
672
745
safer_gnutls_strerror(ret));
673
746
goto globalfail;
674
747
}
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
748
}
686
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
687
750
688
751
return 0;
690
753
globalfail:
691
754
692
755
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
694
756
gnutls_dh_params_deinit(mc->dh_params);
695
757
return -1;
696
758
}
748
810
/* ignore client certificate if any. */
749
811
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
812
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
753
813
return 0;
754
814
}
755
815
759
819
760
820
/* Set effective uid to 0, return errno */
761
821
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
765
825
if(seteuid(0) == -1){
766
ret_errno = errno;
826
ret = errno;
767
827
}
768
828
errno = old_errno;
769
return ret_errno;
829
return ret;
770
830
}
771
831
772
832
/* Set effective and real user ID to 0. Return errno. */
773
833
__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){
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
778
838
errno = old_errno;
779
return ret_errno;
839
return ret;
780
840
}
781
841
if(setuid(0) == -1){
782
ret_errno = errno;
842
ret = errno;
783
843
}
784
844
errno = old_errno;
785
return ret_errno;
845
return ret;
786
846
}
787
847
788
848
/* Set effective user ID to unprivileged saved user ID */
789
849
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
793
853
if(seteuid(uid) == -1){
794
ret_errno = errno;
854
ret = errno;
795
855
}
796
856
errno = old_errno;
797
return ret_errno;
857
return ret;
798
858
}
799
859
800
860
/* Lower privileges permanently */
801
861
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
805
865
if(setuid(uid) == -1){
806
ret_errno = errno;
866
ret = errno;
807
867
}
808
868
errno = old_errno;
809
return ret_errno;
869
return ret;
810
870
}
811
871
812
872
/* Helper function to add_local_route() and delete_local_route() */
868
928
perror_plus("dup2(devnull, STDIN_FILENO)");
869
929
_exit(EX_OSERR);
870
930
}
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
931
ret = close(devnull);
872
932
if(ret == -1){
873
933
perror_plus("close");
874
934
_exit(EX_OSERR);
891
951
helper, O_RDONLY));
892
952
if(helper_fd == -1){
893
953
perror_plus("openat");
954
close(helperdir_fd);
894
955
_exit(EX_UNAVAILABLE);
895
956
}
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
957
close(helperdir_fd);
897
958
#ifdef __GNUC__
898
959
#pragma GCC diagnostic push
899
960
#pragma GCC diagnostic ignored "-Wcast-qual"
1018
1079
bool match = false;
1019
1080
{
1020
1081
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1023
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1024
1086
match = true;
1025
1087
break;
1067
1129
goto mandos_end;
1068
1130
}
1069
1131
1070
memset(&to, 0, sizeof(to));
1071
1132
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);
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);
1074
1136
} 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);
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);
1077
1140
}
1078
1141
if(ret < 0 ){
1079
1142
int e = errno;
1158
1221
sizeof(struct sockaddr_in));
1159
1222
}
1160
1223
if(ret < 0){
1161
if(errno == ENETUNREACH
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1162
1225
and if_index != AVAHI_IF_UNSPEC
1163
1226
and connect_to == NULL
1164
1227
and not route_added and
1177
1240
with an explicit route added with the server's address.
1178
1241
1179
1242
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
1244
https://bugs.debian.org/587961
1182
1245
*/
1183
1246
if(debug){
1363
1426
&decrypted_buffer, mc);
1364
1427
if(decrypted_buffer_size >= 0){
1365
1428
1429
clearerr(stdout);
1366
1430
written = 0;
1367
1431
while(written < (size_t) decrypted_buffer_size){
1368
1432
if(quit_now){
1384
1448
}
1385
1449
written += (size_t)ret;
1386
1450
}
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
}
1387
1461
retval = 0;
1388
1462
}
1389
1463
}
1402
1476
free(decrypted_buffer);
1403
1477
free(buffer);
1404
1478
if(tcp_sd >= 0){
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
ret = close(tcp_sd);
1406
1480
}
1407
1481
if(ret == -1){
1408
1482
if(e == 0){
1420
1494
return retval;
1421
1495
}
1422
1496
1423
__attribute__((nonnull))
1424
1497
static void resolve_callback(AvahiSServiceResolver *r,
1425
1498
AvahiIfIndex interface,
1426
1499
AvahiProtocol proto,
1563
1636
__attribute__((nonnull, warn_unused_result))
1564
1637
bool get_flags(const char *ifname, struct ifreq *ifr){
1565
1638
int ret;
1566
error_t ret_errno;
1639
int old_errno;
1567
1640
1568
1641
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1569
1642
if(s < 0){
1570
ret_errno = errno;
1643
old_errno = errno;
1571
1644
perror_plus("socket");
1572
errno = ret_errno;
1645
errno = old_errno;
1573
1646
return false;
1574
1647
}
1575
strcpy(ifr->ifr_name, ifname);
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1576
1650
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1577
1651
if(ret == -1){
1578
1652
if(debug){
1579
ret_errno = errno;
1653
old_errno = errno;
1580
1654
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1655
errno = old_errno;
1582
1656
}
1583
1657
return false;
1584
1658
}
1848
1922
return;
1849
1923
}
1850
1924
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
1853
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
1926
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
1927
if(numhooks == -1){
1864
1928
perror_plus("scandir");
1865
1929
return;
1947
2011
perror_plus("openat");
1948
2012
_exit(EXIT_FAILURE);
1949
2013
}
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
if(close(hookdir_fd) == -1){
1951
2015
perror_plus("close");
1952
2016
_exit(EXIT_FAILURE);
1953
2017
}
1956
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
1957
2021
_exit(EX_OSERR);
1958
2022
}
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2023
ret = close(devnull);
1960
2024
if(ret == -1){
1961
2025
perror_plus("close");
1962
2026
_exit(EX_OSERR);
2011
2075
free(direntry);
2012
2076
}
2013
2077
free(direntries);
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
if(close(hookdir_fd) == -1){
2015
2079
perror_plus("close");
2016
2080
} else {
2017
2081
hookdir_fd = -1;
2020
2084
}
2021
2085
2022
2086
__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;
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2026
2090
int ret;
2027
2091
struct ifreq network;
2028
2092
unsigned int if_index = if_nametoindex(interface);
2038
2102
}
2039
2103
2040
2104
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2042
2107
if(not get_flags(interface, &network)){
2043
2108
ret_errno = errno;
2044
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2057
2122
}
2058
2123
2059
2124
if(quit_now){
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2125
ret = close(sd);
2061
2126
if(ret == -1){
2062
2127
perror_plus("close");
2063
2128
}
2113
2178
}
2114
2179
2115
2180
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2181
ret = close(sd);
2117
2182
if(ret == -1){
2118
2183
perror_plus("close");
2119
2184
}
2131
2196
2132
2197
/* Sleep checking until interface is running.
2133
2198
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2199
for(int i = 0; i < delay * 4; i++){
2135
2200
if(interface_is_running(interface)){
2136
2201
break;
2137
2202
}
2147
2212
}
2148
2213
2149
2214
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2152
2217
struct ifreq network;
2153
2218
unsigned int if_index = if_nametoindex(interface);
2154
2219
if(if_index == 0){
2157
2222
return ENXIO;
2158
2223
}
2159
2224
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2161
2227
if(not get_flags(interface, &network) and debug){
2162
2228
ret_errno = errno;
2163
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2201
2267
}
2202
2268
2203
2269
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
int ret = close(sd);
2205
2271
if(ret == -1){
2206
2272
perror_plus("close");
2207
2273
}
2223
2289
2224
2290
int main(int argc, char *argv[]){
2225
2291
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 };
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
2229
2296
AvahiSServiceBrowser *sb = NULL;
2230
2297
error_t ret_errno;
2231
2298
int ret;
2240
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
2308
const char *seckey = PATHDIR "/" SECKEY;
2242
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2243
2311
char *interfaces_hooks = NULL;
2244
2312
2245
2313
bool gnutls_initialized = false;
2298
2366
.doc = "Bit length of the prime number used in the"
2299
2367
" Diffie-Hellman key exchange",
2300
2368
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
2301
2374
{ .name = "priority", .key = 130,
2302
2375
.arg = "STRING",
2303
2376
.doc = "GnuTLS priority string for the TLS handshake",
2358
2431
}
2359
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2360
2433
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2361
2437
case 130: /* --priority */
2362
2438
mc.priority = arg;
2363
2439
break;
2403
2479
.args_doc = "",
2404
2480
.doc = "Mandos client -- Get and decrypt"
2405
2481
" passwords from a Mandos server" };
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2408
switch(ret){
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
2409
2485
case 0:
2410
2486
break;
2411
2487
case ENOMEM:
2412
2488
default:
2413
errno = ret;
2489
errno = ret_errno;
2414
2490
perror_plus("argp_parse");
2415
2491
exitcode = EX_OSERR;
2416
2492
goto end;
2422
2498
2423
2499
{
2424
2500
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2501
<https://bugs.debian.org/633582> */
2426
2502
2427
2503
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2431
2507
perror_plus("Failed to raise privileges");
2432
2508
} else {
2433
2509
struct stat st;
2449
2525
}
2450
2526
}
2451
2527
}
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
close(seckey_fd);
2453
2529
}
2454
2530
}
2455
2531
2470
2546
}
2471
2547
}
2472
2548
}
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2474
2572
}
2475
2573
}
2476
2574
2477
2575
/* Lower privileges */
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2481
2579
perror_plus("Failed to lower privileges");
2482
2580
}
2483
2581
}
2653
2751
errno = bring_up_interface(interface, delay);
2654
2752
if(not interface_was_up){
2655
2753
if(errno != 0){
2656
perror_plus("Failed to bring up interface");
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2657
2756
} else {
2658
2757
errno = argz_add(&interfaces_to_take_down,
2659
2758
&interfaces_to_take_down_size,
2682
2781
goto end;
2683
2782
}
2684
2783
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2686
2785
if(ret == -1){
2687
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
2787
exitcode = EX_UNAVAILABLE;
2810
2909
2811
2910
/* Allocate a new server */
2812
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
2912
&config, NULL, NULL, &ret);
2814
2913
2815
2914
/* Free the Avahi configuration data */
2816
2915
avahi_server_config_free(&config);
2819
2918
/* Check if creating the Avahi server object succeeded */
2820
2919
if(mc.server == NULL){
2821
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
2921
avahi_strerror(ret));
2823
2922
exitcode = EX_UNAVAILABLE;
2824
2923
goto end;
2825
2924
}
2860
2959
end:
2861
2960
2862
2961
if(debug){
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
2864
2969
}
2865
2970
2866
2971
/* Cleanup things */
2877
2982
2878
2983
if(gnutls_initialized){
2879
2984
gnutls_certificate_free_credentials(mc.cred);
2880
gnutls_global_deinit();
2881
2985
gnutls_dh_params_deinit(mc.dh_params);
2882
2986
}
2883
2987
2906
3010
2907
3011
/* Re-raise privileges */
2908
3012
{
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
2912
3016
perror_plus("Failed to raise privileges");
2913
3017
} else {
2914
3018
2919
3023
/* Take down the network interfaces which were brought up */
2920
3024
{
2921
3025
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;
3026
while((interface = argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
2928
3032
perror_plus("Failed to take down interface");
2929
3033
}
2930
3034
}
2935
3039
}
2936
3040
}
2937
3041
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
2941
3045
perror_plus("Failed to lower privileges permanently");
2942
3046
}
2943
3047
}
2945
3049
free(interfaces_to_take_down);
2946
3050
free(interfaces_hooks);
2947
3051
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
3054
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
2948
3108
/* Removes the GPGME temp directory and all files inside */
2949
3109
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
}
3110
clean_dir_at(-1, tempdir, 0);
2993
3111
}
2994
3112
2995
3113
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0