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- Committer: Teddy Hogeborn
- Date: 2014-06-07 22:37:22 UTC
- Revision ID: teddy@recompile.se-20140607223722-55qmdr3n9x39pvx4
Make mandos-client use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 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
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
76
setgid(), pause(), _exit() */
84
77
#include <arpa/inet.h> /* inet_pton(), htons() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
240
233
.af = af };
241
234
if(new_server->ip == NULL){
242
235
perror_plus("strdup");
243
free(new_server);
244
236
return false;
245
237
}
246
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
239
if(ret == -1){
248
240
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
241
return false;
259
242
}
260
243
/* Special case of first server */
311
294
return false;
312
295
}
313
296
314
ret = close(fd);
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
298
if(ret == -1){
316
299
perror_plus("close");
317
300
}
499
482
return plaintext_length;
500
483
}
501
484
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
485
__attribute__((warn_unused_result))
510
486
static const char *safer_gnutls_strerror(int value){
511
487
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
488
if(ret == NULL)
489
ret = "(unknown)";
490
return ret;
513
491
}
514
492
515
493
/* GnuTLS log function callback */
519
497
fprintf_plus(stderr, "GnuTLS: %s", string);
520
498
}
521
499
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
__attribute__((nonnull, warn_unused_result))
523
501
static int init_gnutls_global(const char *pubkeyfilename,
524
502
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
503
mandos_context *mc){
527
504
int ret;
528
unsigned int uret;
529
505
530
506
if(debug){
531
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
508
}
533
509
510
ret = gnutls_global_init();
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
514
return -1;
515
}
516
534
517
if(debug){
535
518
/* "Use a log level over 10 to enable all debugging options."
536
519
* - GnuTLS manual
544
527
if(ret != GNUTLS_E_SUCCESS){
545
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
547
531
return -1;
548
532
}
549
533
574
558
safer_gnutls_strerror(ret));
575
559
goto globalfail;
576
560
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
565
goto globalfail;
566
}
567
754
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
755
569
756
570
return 0;
758
572
globalfail:
759
573
760
574
gnutls_certificate_free_credentials(mc->cred);
575
gnutls_global_deinit();
761
576
gnutls_dh_params_deinit(mc->dh_params);
762
577
return -1;
763
578
}
815
630
/* ignore client certificate if any. */
816
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
817
632
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
634
818
635
return 0;
819
636
}
820
637
822
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
823
640
__attribute__((unused)) const char *txt){}
824
641
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
1043
642
/* Called when a Mandos server is found */
1044
643
__attribute__((nonnull, warn_unused_result))
1045
644
static int start_mandos_communication(const char *ip, in_port_t port,
1056
655
int retval = -1;
1057
656
gnutls_session_t session;
1058
657
int pf; /* Protocol family */
1059
bool route_added = false;
1060
658
1061
659
errno = 0;
1062
660
1084
682
bool match = false;
1085
683
{
1086
684
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
1090
687
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
688
match = true;
1092
689
break;
1121
718
PRIuMAX "\n", ip, (uintmax_t)port);
1122
719
}
1123
720
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
1125
722
if(tcp_sd < 0){
1126
723
int e = errno;
1127
724
perror_plus("socket");
1134
731
goto mandos_end;
1135
732
}
1136
733
734
memset(&to, 0, sizeof(to));
1137
735
if(af == AF_INET6){
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1141
738
} else { /* IPv4 */
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1145
741
}
1146
742
if(ret < 0 ){
1147
743
int e = errno;
1217
813
goto mandos_end;
1218
814
}
1219
815
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
1275
835
}
1276
836
1277
837
const char *out = mandos_protocol_version;
1431
991
&decrypted_buffer, mc);
1432
992
if(decrypted_buffer_size >= 0){
1433
993
1434
clearerr(stdout);
1435
994
written = 0;
1436
995
while(written < (size_t) decrypted_buffer_size){
1437
996
if(quit_now){
1453
1012
}
1454
1013
written += (size_t)ret;
1455
1014
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1466
1015
retval = 0;
1467
1016
}
1468
1017
}
1471
1020
1472
1021
mandos_end:
1473
1022
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
1480
1023
int e = errno;
1481
1024
free(decrypted_buffer);
1482
1025
free(buffer);
1483
1026
if(tcp_sd >= 0){
1484
ret = close(tcp_sd);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1485
1028
}
1486
1029
if(ret == -1){
1487
1030
if(e == 0){
1499
1042
return retval;
1500
1043
}
1501
1044
1045
__attribute__((nonnull))
1502
1046
static void resolve_callback(AvahiSServiceResolver *r,
1503
1047
AvahiIfIndex interface,
1504
1048
AvahiProtocol proto,
1521
1065
timed out */
1522
1066
1523
1067
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1525
1068
return;
1526
1069
}
1527
1070
1641
1184
__attribute__((nonnull, warn_unused_result))
1642
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
1186
int ret;
1644
int old_errno;
1187
error_t ret_errno;
1645
1188
1646
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
1190
if(s < 0){
1648
old_errno = errno;
1191
ret_errno = errno;
1649
1192
perror_plus("socket");
1650
errno = old_errno;
1193
errno = ret_errno;
1651
1194
return false;
1652
1195
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
strcpy(ifr->ifr_name, ifname);
1655
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
1198
if(ret == -1){
1657
1199
if(debug){
1658
old_errno = errno;
1200
ret_errno = errno;
1659
1201
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1202
errno = ret_errno;
1666
1203
}
1667
1204
return false;
1668
1205
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
1206
return true;
1675
1207
}
1676
1208
1918
1450
}
1919
1451
}
1920
1452
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1459
ret_errno = errno;
1460
perror_plus("seteuid");
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
perror_plus("seteuid");
1478
}
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1489
ret_errno = errno;
1490
perror_plus("seteuid");
1491
}
1492
errno = old_errno;
1493
return ret_errno;
1494
}
1495
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1502
ret_errno = errno;
1503
perror_plus("setuid");
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
#ifndef O_CLOEXEC
1510
/*
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1514
*/
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1519
if(ret < 0){
1520
return ret;
1521
}
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1524
ret | FD_CLOEXEC));
1525
}
1526
#endif /* not O_CLOEXEC */
1527
1921
1528
__attribute__((nonnull))
1922
1529
void run_network_hooks(const char *mode, const char *interface,
1923
1530
const float delay){
1924
struct dirent **direntries = NULL;
1531
struct dirent **direntries;
1925
1532
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1533
hookdir_fd = open(hookdir, O_RDONLY |
1534
#ifdef O_CLOEXEC
1535
O_CLOEXEC
1536
#else /* not O_CLOEXEC */
1537
0
1538
#endif /* not O_CLOEXEC */
1539
);
1928
1540
if(hookdir_fd == -1){
1929
1541
if(errno == ENOENT){
1930
1542
if(debug){
1936
1548
}
1937
1549
return;
1938
1550
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1551
#ifndef O_CLOEXEC
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1556
} else {
1557
hookdir_fd = -1;
1558
}
1559
return;
1560
}
1561
#endif /* not O_CLOEXEC */
1562
}
1563
#ifdef __GLIBC__
1564
#if __GLIBC_PREREQ(2, 15)
1945
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1569
alphasort);
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1573
alphasort);
1574
#endif /* not __GLIBC__ */
1947
1575
if(numhooks == -1){
1948
1576
perror_plus("scandir");
1949
close(devnull);
1950
1577
return;
1951
1578
}
1952
1579
struct dirent *direntry;
1953
1580
int ret;
1581
int devnull = open("/dev/null", O_RDONLY);
1954
1582
for(int i = 0; i < numhooks; i++){
1955
1583
direntry = direntries[i];
1956
1584
if(debug){
1961
1589
if(hook_pid == 0){
1962
1590
/* Child */
1963
1591
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1592
if(raise_privileges_permanently() != 0){
1966
1593
perror_plus("Failed to raise privileges");
1967
1594
_exit(EX_NOPERM);
1968
1595
}
1980
1607
perror_plus("setgroups");
1981
1608
_exit(EX_NOPERM);
1982
1609
}
1610
ret = dup2(devnull, STDIN_FILENO);
1611
if(ret == -1){
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1613
_exit(EX_OSERR);
1614
}
1615
ret = close(devnull);
1616
if(ret == -1){
1617
perror_plus("close");
1618
_exit(EX_OSERR);
1619
}
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1621
if(ret == -1){
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1623
_exit(EX_OSERR);
1624
}
1983
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
1626
if(ret == -1){
1985
1627
perror_plus("setenv");
2020
1662
_exit(EX_OSERR);
2021
1663
}
2022
1664
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
2051
1667
perror_plus("fexecve");
2052
1668
_exit(EXIT_FAILURE);
2053
1669
}
2054
1670
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
1671
int status;
2061
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
1673
perror_plus("waitpid");
2063
free(direntry);
2064
1674
continue;
2065
1675
}
2066
1676
if(WIFEXITED(status)){
2068
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
1679
" with status %d\n", direntry->d_name,
2070
1680
WEXITSTATUS(status));
2071
free(direntry);
2072
1681
continue;
2073
1682
}
2074
1683
} else if(WIFSIGNALED(status)){
2075
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
1685
" signal %d\n", direntry->d_name,
2077
1686
WTERMSIG(status));
2078
free(direntry);
2079
1687
continue;
2080
1688
} else {
2081
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
1690
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
1691
continue;
2085
1692
}
2086
1693
}
2088
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
1696
direntry->d_name);
2090
1697
}
2091
free(direntry);
2092
1698
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2095
1700
perror_plus("close");
2096
1701
} else {
2097
1702
hookdir_fd = -1;
2100
1705
}
2101
1706
2102
1707
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
1708
error_t bring_up_interface(const char *const interface,
1709
const float delay){
1710
error_t old_errno = errno;
2106
1711
int ret;
2107
1712
struct ifreq network;
2108
1713
unsigned int if_index = if_nametoindex(interface);
2118
1723
}
2119
1724
2120
1725
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
1726
error_t ret_errno = 0, ioctl_errno = 0;
2123
1727
if(not get_flags(interface, &network)){
2124
1728
ret_errno = errno;
2125
1729
fprintf_plus(stderr, "Failed to get flags for interface "
2138
1742
}
2139
1743
2140
1744
if(quit_now){
2141
ret = close(sd);
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2142
1746
if(ret == -1){
2143
1747
perror_plus("close");
2144
1748
}
2154
1758
/* Raise privileges */
2155
1759
ret_errno = raise_privileges();
2156
1760
if(ret_errno != 0){
2157
errno = ret_errno;
2158
1761
perror_plus("Failed to raise privileges");
2159
1762
}
2160
1763
2194
1797
}
2195
1798
2196
1799
/* Close the socket */
2197
ret = close(sd);
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2198
1801
if(ret == -1){
2199
1802
perror_plus("close");
2200
1803
}
2212
1815
2213
1816
/* Sleep checking until interface is running.
2214
1817
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
1818
for(int i=0; i < delay * 4; i++){
2216
1819
if(interface_is_running(interface)){
2217
1820
break;
2218
1821
}
2228
1831
}
2229
1832
2230
1833
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
2233
1836
struct ifreq network;
2234
1837
unsigned int if_index = if_nametoindex(interface);
2235
1838
if(if_index == 0){
2238
1841
return ENXIO;
2239
1842
}
2240
1843
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
1844
error_t ret_errno = 0, ioctl_errno = 0;
2243
1845
if(not get_flags(interface, &network) and debug){
2244
1846
ret_errno = errno;
2245
1847
fprintf_plus(stderr, "Failed to get flags for interface "
2265
1867
/* Raise privileges */
2266
1868
ret_errno = raise_privileges();
2267
1869
if(ret_errno != 0){
2268
errno = ret_errno;
2269
1870
perror_plus("Failed to raise privileges");
2270
1871
}
2271
1872
2283
1884
}
2284
1885
2285
1886
/* Close the socket */
2286
int ret = close(sd);
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2287
1888
if(ret == -1){
2288
1889
perror_plus("close");
2289
1890
}
2304
1905
}
2305
1906
2306
1907
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
2312
1912
AvahiSServiceBrowser *sb = NULL;
2313
1913
error_t ret_errno;
2314
1914
int ret;
2323
1923
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
1924
const char *seckey = PATHDIR "/" SECKEY;
2325
1925
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
1926
char *interfaces_hooks = NULL;
2328
1927
2329
1928
bool gnutls_initialized = false;
2382
1981
.doc = "Bit length of the prime number used in the"
2383
1982
" Diffie-Hellman key exchange",
2384
1983
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
2390
1984
{ .name = "priority", .key = 130,
2391
1985
.arg = "STRING",
2392
1986
.doc = "GnuTLS priority string for the TLS handshake",
2447
2041
}
2448
2042
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2449
2043
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2453
2044
case 130: /* --priority */
2454
2045
mc.priority = arg;
2455
2046
break;
2495
2086
.args_doc = "",
2496
2087
.doc = "Mandos client -- Get and decrypt"
2497
2088
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2089
ret = argp_parse(&argp, argc, argv,
2090
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2091
switch(ret){
2501
2092
case 0:
2502
2093
break;
2503
2094
case ENOMEM:
2504
2095
default:
2505
errno = ret_errno;
2096
errno = ret;
2506
2097
perror_plus("argp_parse");
2507
2098
exitcode = EX_OSERR;
2508
2099
goto end;
2511
2102
goto end;
2512
2103
}
2513
2104
}
2514
2105
2515
2106
{
2516
2107
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2108
<http://bugs.debian.org/633582> */
2518
2109
2519
2110
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2111
ret_errno = raise_privileges();
2112
if(ret_errno != 0){
2113
errno = ret_errno;
2523
2114
perror_plus("Failed to raise privileges");
2524
2115
} else {
2525
2116
struct stat st;
2541
2132
}
2542
2133
}
2543
2134
}
2544
close(seckey_fd);
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2545
2136
}
2546
2137
}
2547
2138
2548
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2550
2141
if(pubkey_fd == -1){
2562
2153
}
2563
2154
}
2564
2155
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2157
}
2158
}
2159
2591
2160
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2161
ret_errno = lower_privileges();
2162
if(ret_errno != 0){
2163
errno = ret_errno;
2595
2164
perror_plus("Failed to lower privileges");
2596
2165
}
2597
2166
}
2710
2279
2711
2280
/* If no interfaces were specified, make a list */
2712
2281
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2282
struct dirent **direntries;
2714
2283
/* Look for any good interfaces */
2715
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2716
2285
alphasort);
2722
2291
if(ret_errno != 0){
2723
2292
errno = ret_errno;
2724
2293
perror_plus("argz_add");
2725
free(direntries[i]);
2726
2294
continue;
2727
2295
}
2728
2296
if(debug){
2729
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
2298
direntries[i]->d_name);
2731
2299
}
2732
free(direntries[i]);
2733
2300
}
2734
2301
free(direntries);
2735
2302
} else {
2736
if(ret == 0){
2737
free(direntries);
2738
}
2303
free(direntries);
2739
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2740
2305
exitcode = EXIT_FAILURE;
2741
2306
goto end;
2767
2332
errno = bring_up_interface(interface, delay);
2768
2333
if(not interface_was_up){
2769
2334
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2335
perror_plus("Failed to bring up interface");
2772
2336
} else {
2773
2337
errno = argz_add(&interfaces_to_take_down,
2774
2338
&interfaces_to_take_down_size,
2797
2361
goto end;
2798
2362
}
2799
2363
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
2801
2365
if(ret == -1){
2802
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
2367
exitcode = EX_UNAVAILABLE;
2925
2489
2926
2490
/* Allocate a new server */
2927
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2492
&config, NULL, NULL, &ret_errno);
2929
2493
2930
2494
/* Free the Avahi configuration data */
2931
2495
avahi_server_config_free(&config);
2934
2498
/* Check if creating the Avahi server object succeeded */
2935
2499
if(mc.server == NULL){
2936
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2501
avahi_strerror(ret_errno));
2938
2502
exitcode = EX_UNAVAILABLE;
2939
2503
goto end;
2940
2504
}
2975
2539
end:
2976
2540
2977
2541
if(debug){
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2985
2543
}
2986
2544
2987
2545
/* Cleanup things */
2998
2556
2999
2557
if(gnutls_initialized){
3000
2558
gnutls_certificate_free_credentials(mc.cred);
2559
gnutls_global_deinit();
3001
2560
gnutls_dh_params_deinit(mc.dh_params);
3002
2561
}
3003
2562
3011
2570
mc.current_server->prev->next = NULL;
3012
2571
while(mc.current_server != NULL){
3013
2572
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
3022
2573
free(mc.current_server);
3023
2574
mc.current_server = next;
3024
2575
}
3026
2577
3027
2578
/* Re-raise privileges */
3028
2579
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
2580
ret_errno = raise_privileges();
2581
if(ret_errno != 0){
3032
2582
perror_plus("Failed to raise privileges");
3033
2583
} else {
3034
2584
3039
2589
/* Take down the network interfaces which were brought up */
3040
2590
{
3041
2591
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2594
interface))){
2595
ret_errno = take_down_interface(interface);
2596
if(ret_errno != 0){
2597
errno = ret_errno;
3048
2598
perror_plus("Failed to take down interface");
3049
2599
}
3050
2600
}
3055
2605
}
3056
2606
}
3057
2607
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
3061
2610
perror_plus("Failed to lower privileges permanently");
3062
2611
}
3063
2612
}
3065
2614
free(interfaces_to_take_down);
3066
2615
free(interfaces_hooks);
3067
2616
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3122
2617
/* Removes the GPGME temp directory and all files inside */
3123
2618
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2619
struct dirent **direntries = NULL;
2620
struct dirent *direntry = NULL;
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2622
alphasort);
2623
if(numentries > 0){
2624
for(int i = 0; i < numentries; i++){
2625
direntry = direntries[i];
2626
char *fullname = NULL;
2627
ret = asprintf(&fullname, "%s/%s", tempdir,
2628
direntry->d_name);
2629
if(ret < 0){
2630
perror_plus("asprintf");
2631
continue;
2632
}
2633
ret = remove(fullname);
2634
if(ret == -1){
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2636
strerror(errno));
2637
}
2638
free(fullname);
2639
}
2640
}
2641
2642
/* need to clean even if 0 because man page doesn't specify */
2643
free(direntries);
2644
if(numentries == -1){
2645
perror_plus("scandir");
2646
}
2647
ret = rmdir(tempdir);
2648
if(ret == -1 and errno != ENOENT){
2649
perror_plus("rmdir");
2650
}
3125
2651
}
3126
2652
3127
2653
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0