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- Committer: Teddy Hogeborn
- Date: 2018-02-22 09:20:19 UTC
- Revision ID: teddy@recompile.se-20180222092019-ehyz79hzti9dnk2g
Client bug fix: Don't use leak sanitizer with leaking libraries
* Makefile (plugin-helpers/mandos-client): Remove "-fsanitize=leak"
from CFLAGS.
* Makefile (plugin-helpers/mandos-client): Remove "-fsanitize=leak"
from CFLAGS.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 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
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
60
inet_pton(), connect(),
59
61
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
64
*/
63
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
66
strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
234
240
.af = af };
235
241
if(new_server->ip == NULL){
236
242
perror_plus("strdup");
243
free(new_server);
237
244
return false;
238
245
}
239
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
247
if(ret == -1){
241
248
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);
242
258
return false;
243
259
}
244
260
/* Special case of first server */
295
311
return false;
296
312
}
297
313
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
299
315
if(ret == -1){
300
316
perror_plus("close");
301
317
}
483
499
return plaintext_length;
484
500
}
485
501
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
486
509
__attribute__((warn_unused_result))
487
510
static const char *safer_gnutls_strerror(int value){
488
511
const char *ret = gnutls_strerror(value);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
512
return safe_string(ret);
492
513
}
493
514
494
515
/* GnuTLS log function callback */
498
519
fprintf_plus(stderr, "GnuTLS: %s", string);
499
520
}
500
521
501
__attribute__((nonnull, warn_unused_result))
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
502
523
static int init_gnutls_global(const char *pubkeyfilename,
503
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
504
526
mandos_context *mc){
505
527
int ret;
528
unsigned int uret;
506
529
507
530
if(debug){
508
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
509
532
}
510
533
511
ret = gnutls_global_init();
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
515
return -1;
516
}
517
518
534
if(debug){
519
535
/* "Use a log level over 10 to enable all debugging options."
520
536
* - GnuTLS manual
528
544
if(ret != GNUTLS_E_SUCCESS){
529
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
546
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
532
547
return -1;
533
548
}
534
549
559
574
safer_gnutls_strerror(ret));
560
575
goto globalfail;
561
576
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
566
goto globalfail;
567
}
568
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
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
569
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
570
752
571
753
return 0;
573
755
globalfail:
574
756
575
757
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
577
758
gnutls_dh_params_deinit(mc->dh_params);
578
759
return -1;
579
760
}
631
812
/* ignore client certificate if any. */
632
813
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
814
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
636
815
return 0;
637
816
}
638
817
640
819
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
641
820
__attribute__((unused)) const char *txt){}
642
821
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
827
if(seteuid(0) == -1){
828
ret = errno;
829
}
830
errno = old_errno;
831
return ret;
832
}
833
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
840
errno = old_errno;
841
return ret;
842
}
843
if(setuid(0) == -1){
844
ret = errno;
845
}
846
errno = old_errno;
847
return ret;
848
}
849
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
855
if(seteuid(uid) == -1){
856
ret = errno;
857
}
858
errno = old_errno;
859
return ret;
860
}
861
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
867
if(setuid(uid) == -1){
868
ret = errno;
869
}
870
errno = old_errno;
871
return ret;
872
}
873
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
877
const char *address,
878
AvahiIfIndex if_index){
879
int ret;
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
886
if(debug){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
889
}
890
return false;
891
}
892
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
896
return false;
897
}
898
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
if(devnull == -1){
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
902
return false;
903
}
904
pid_t pid = fork();
905
if(pid == 0){
906
/* Child */
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
909
if(errno != 0){
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
912
} else {
913
/* Set group */
914
errno = 0;
915
ret = setgid(0);
916
if(ret == -1){
917
perror_plus("setgid");
918
_exit(EX_NOPERM);
919
}
920
/* Reset supplementary groups */
921
errno = 0;
922
ret = setgroups(0, NULL);
923
if(ret == -1){
924
perror_plus("setgroups");
925
_exit(EX_NOPERM);
926
}
927
}
928
ret = dup2(devnull, STDIN_FILENO);
929
if(ret == -1){
930
perror_plus("dup2(devnull, STDIN_FILENO)");
931
_exit(EX_OSERR);
932
}
933
ret = close(devnull);
934
if(ret == -1){
935
perror_plus("close");
936
_exit(EX_OSERR);
937
}
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
if(ret == -1){
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
_exit(EX_OSERR);
942
}
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
O_RDONLY
945
| O_DIRECTORY
946
| O_PATH
947
| O_CLOEXEC));
948
if(helperdir_fd == -1){
949
perror_plus("open");
950
_exit(EX_UNAVAILABLE);
951
}
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
helper, O_RDONLY));
954
if(helper_fd == -1){
955
perror_plus("openat");
956
close(helperdir_fd);
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
643
1040
/* Called when a Mandos server is found */
644
1041
__attribute__((nonnull, warn_unused_result))
645
1042
static int start_mandos_communication(const char *ip, in_port_t port,
656
1053
int retval = -1;
657
1054
gnutls_session_t session;
658
1055
int pf; /* Protocol family */
1056
bool route_added = false;
659
1057
660
1058
errno = 0;
661
1059
683
1081
bool match = false;
684
1082
{
685
1083
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
688
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
689
1088
match = true;
690
1089
break;
719
1118
PRIuMAX "\n", ip, (uintmax_t)port);
720
1119
}
721
1120
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
723
1122
if(tcp_sd < 0){
724
1123
int e = errno;
725
1124
perror_plus("socket");
732
1131
goto mandos_end;
733
1132
}
734
1133
735
memset(&to, 0, sizeof(to));
736
1134
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
739
1138
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
742
1142
}
743
1143
if(ret < 0 ){
744
1144
int e = errno;
814
1214
goto mandos_end;
815
1215
}
816
1216
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
836
1272
}
837
1273
838
1274
const char *out = mandos_protocol_version;
992
1428
&decrypted_buffer, mc);
993
1429
if(decrypted_buffer_size >= 0){
994
1430
1431
clearerr(stdout);
995
1432
written = 0;
996
1433
while(written < (size_t) decrypted_buffer_size){
997
1434
if(quit_now){
1013
1450
}
1014
1451
written += (size_t)ret;
1015
1452
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
1016
1463
retval = 0;
1017
1464
}
1018
1465
}
1021
1468
1022
1469
mandos_end:
1023
1470
{
1471
if(route_added){
1472
if(not delete_local_route(ip, if_index)){
1473
fprintf_plus(stderr, "Failed to delete local route to %s on"
1474
" interface %d", ip, if_index);
1475
}
1476
}
1024
1477
int e = errno;
1025
1478
free(decrypted_buffer);
1026
1479
free(buffer);
1027
1480
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
ret = close(tcp_sd);
1029
1482
}
1030
1483
if(ret == -1){
1031
1484
if(e == 0){
1043
1496
return retval;
1044
1497
}
1045
1498
1046
__attribute__((nonnull))
1047
1499
static void resolve_callback(AvahiSServiceResolver *r,
1048
1500
AvahiIfIndex interface,
1049
1501
AvahiProtocol proto,
1066
1518
timed out */
1067
1519
1068
1520
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1069
1522
return;
1070
1523
}
1071
1524
1185
1638
__attribute__((nonnull, warn_unused_result))
1186
1639
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1640
int ret;
1188
error_t ret_errno;
1641
int old_errno;
1189
1642
1190
1643
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1644
if(s < 0){
1192
ret_errno = errno;
1645
old_errno = errno;
1193
1646
perror_plus("socket");
1194
errno = ret_errno;
1647
errno = old_errno;
1195
1648
return false;
1196
1649
}
1197
strcpy(ifr->ifr_name, ifname);
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1198
1652
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1653
if(ret == -1){
1200
1654
if(debug){
1201
ret_errno = errno;
1655
old_errno = errno;
1202
1656
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1657
errno = old_errno;
1204
1658
}
1659
close(s);
1205
1660
return false;
1206
1661
}
1662
close(s);
1207
1663
return true;
1208
1664
}
1209
1665
1451
1907
}
1452
1908
}
1453
1909
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
1910
__attribute__((nonnull))
1511
1911
void run_network_hooks(const char *mode, const char *interface,
1512
1912
const float delay){
1513
struct dirent **direntries;
1913
struct dirent **direntries = NULL;
1514
1914
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1516
1917
if(hookdir_fd == -1){
1517
1918
if(errno == ENOENT){
1518
1919
if(debug){
1525
1926
return;
1526
1927
}
1527
1928
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1530
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
1935
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1540
1936
if(numhooks == -1){
1541
1937
perror_plus("scandir");
1938
close(devnull);
1542
1939
return;
1543
1940
}
1544
1941
struct dirent *direntry;
1545
1942
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
1943
for(int i = 0; i < numhooks; i++){
1548
1944
direntry = direntries[i];
1549
1945
if(debug){
1554
1950
if(hook_pid == 0){
1555
1951
/* Child */
1556
1952
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1953
errno = raise_privileges_permanently();
1954
if(errno != 0){
1558
1955
perror_plus("Failed to raise privileges");
1559
1956
_exit(EX_NOPERM);
1560
1957
}
1572
1969
perror_plus("setgroups");
1573
1970
_exit(EX_NOPERM);
1574
1971
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
1973
if(ret == -1){
1592
1974
perror_plus("setenv");
1627
2009
_exit(EX_OSERR);
1628
2010
}
1629
2011
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
1631
2015
if(hook_fd == -1){
1632
2016
perror_plus("openat");
1633
2017
_exit(EXIT_FAILURE);
1634
2018
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2019
if(close(hookdir_fd) == -1){
1636
2020
perror_plus("close");
1637
2021
_exit(EXIT_FAILURE);
1638
2022
}
2023
ret = dup2(devnull, STDIN_FILENO);
2024
if(ret == -1){
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2026
_exit(EX_OSERR);
2027
}
2028
ret = close(devnull);
2029
if(ret == -1){
2030
perror_plus("close");
2031
_exit(EX_OSERR);
2032
}
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2034
if(ret == -1){
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2036
_exit(EX_OSERR);
2037
}
1639
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
2039
environ) == -1){
1641
2040
perror_plus("fexecve");
1642
2041
_exit(EXIT_FAILURE);
1643
2042
}
1644
2043
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
1645
2049
int status;
1646
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
2051
perror_plus("waitpid");
2052
free(direntry);
1648
2053
continue;
1649
2054
}
1650
2055
if(WIFEXITED(status)){
1652
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
2058
" with status %d\n", direntry->d_name,
1654
2059
WEXITSTATUS(status));
2060
free(direntry);
1655
2061
continue;
1656
2062
}
1657
2063
} else if(WIFSIGNALED(status)){
1658
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
2065
" signal %d\n", direntry->d_name,
1660
2066
WTERMSIG(status));
2067
free(direntry);
1661
2068
continue;
1662
2069
} else {
1663
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
2071
" crashed\n", direntry->d_name);
2072
free(direntry);
1665
2073
continue;
1666
2074
}
1667
2075
}
1669
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
2078
direntry->d_name);
1671
2079
}
2080
free(direntry);
1672
2081
}
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2082
free(direntries);
2083
if(close(hookdir_fd) == -1){
1674
2084
perror_plus("close");
1675
2085
} else {
1676
2086
hookdir_fd = -1;
1679
2089
}
1680
2090
1681
2091
__attribute__((nonnull, warn_unused_result))
1682
error_t bring_up_interface(const char *const interface,
1683
const float delay){
1684
error_t old_errno = errno;
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
1685
2095
int ret;
1686
2096
struct ifreq network;
1687
2097
unsigned int if_index = if_nametoindex(interface);
1697
2107
}
1698
2108
1699
2109
if(not interface_is_up(interface)){
1700
error_t ret_errno = 0, ioctl_errno = 0;
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
1701
2112
if(not get_flags(interface, &network)){
1702
2113
ret_errno = errno;
1703
2114
fprintf_plus(stderr, "Failed to get flags for interface "
1716
2127
}
1717
2128
1718
2129
if(quit_now){
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2130
ret = close(sd);
1720
2131
if(ret == -1){
1721
2132
perror_plus("close");
1722
2133
}
1732
2143
/* Raise privileges */
1733
2144
ret_errno = raise_privileges();
1734
2145
if(ret_errno != 0){
2146
errno = ret_errno;
1735
2147
perror_plus("Failed to raise privileges");
1736
2148
}
1737
2149
1771
2183
}
1772
2184
1773
2185
/* Close the socket */
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2186
ret = close(sd);
1775
2187
if(ret == -1){
1776
2188
perror_plus("close");
1777
2189
}
1789
2201
1790
2202
/* Sleep checking until interface is running.
1791
2203
Check every 0.25s, up to total time of delay */
1792
for(int i=0; i < delay * 4; i++){
2204
for(int i = 0; i < delay * 4; i++){
1793
2205
if(interface_is_running(interface)){
1794
2206
break;
1795
2207
}
1805
2217
}
1806
2218
1807
2219
__attribute__((nonnull, warn_unused_result))
1808
error_t take_down_interface(const char *const interface){
1809
error_t old_errno = errno;
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
1810
2222
struct ifreq network;
1811
2223
unsigned int if_index = if_nametoindex(interface);
1812
2224
if(if_index == 0){
1815
2227
return ENXIO;
1816
2228
}
1817
2229
if(interface_is_up(interface)){
1818
error_t ret_errno = 0, ioctl_errno = 0;
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
1819
2232
if(not get_flags(interface, &network) and debug){
1820
2233
ret_errno = errno;
1821
2234
fprintf_plus(stderr, "Failed to get flags for interface "
1841
2254
/* Raise privileges */
1842
2255
ret_errno = raise_privileges();
1843
2256
if(ret_errno != 0){
2257
errno = ret_errno;
1844
2258
perror_plus("Failed to raise privileges");
1845
2259
}
1846
2260
1858
2272
}
1859
2273
1860
2274
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2275
int ret = close(sd);
1862
2276
if(ret == -1){
1863
2277
perror_plus("close");
1864
2278
}
1879
2293
}
1880
2294
1881
2295
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
1886
2301
AvahiSServiceBrowser *sb = NULL;
1887
2302
error_t ret_errno;
1888
2303
int ret;
1897
2312
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
2313
const char *seckey = PATHDIR "/" SECKEY;
1899
2314
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
1900
2316
char *interfaces_hooks = NULL;
1901
2317
1902
2318
bool gnutls_initialized = false;
1955
2371
.doc = "Bit length of the prime number used in the"
1956
2372
" Diffie-Hellman key exchange",
1957
2373
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
1958
2379
{ .name = "priority", .key = 130,
1959
2380
.arg = "STRING",
1960
2381
.doc = "GnuTLS priority string for the TLS handshake",
2015
2436
}
2016
2437
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2017
2438
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
2018
2442
case 130: /* --priority */
2019
2443
mc.priority = arg;
2020
2444
break;
2060
2484
.args_doc = "",
2061
2485
.doc = "Mandos client -- Get and decrypt"
2062
2486
" passwords from a Mandos server" };
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
2066
2490
case 0:
2067
2491
break;
2068
2492
case ENOMEM:
2069
2493
default:
2070
errno = ret;
2494
errno = ret_errno;
2071
2495
perror_plus("argp_parse");
2072
2496
exitcode = EX_OSERR;
2073
2497
goto end;
2076
2500
goto end;
2077
2501
}
2078
2502
}
2079
2503
2080
2504
{
2081
2505
/* Work around Debian bug #633582:
2082
<http://bugs.debian.org/633582> */
2506
<https://bugs.debian.org/633582> */
2083
2507
2084
2508
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2088
2512
perror_plus("Failed to raise privileges");
2089
2513
} else {
2090
2514
struct stat st;
2106
2530
}
2107
2531
}
2108
2532
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2533
close(seckey_fd);
2110
2534
}
2111
2535
}
2112
2536
2113
2537
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
2538
int pubkey_fd = open(pubkey, O_RDONLY);
2115
2539
if(pubkey_fd == -1){
2127
2551
}
2128
2552
}
2129
2553
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2577
}
2578
}
2579
2134
2580
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2138
2584
perror_plus("Failed to lower privileges");
2139
2585
}
2140
2586
}
2253
2699
2254
2700
/* If no interfaces were specified, make a list */
2255
2701
if(mc.interfaces == NULL){
2256
struct dirent **direntries;
2702
struct dirent **direntries = NULL;
2257
2703
/* Look for any good interfaces */
2258
2704
ret = scandir(sys_class_net, &direntries, good_interface,
2259
2705
alphasort);
2265
2711
if(ret_errno != 0){
2266
2712
errno = ret_errno;
2267
2713
perror_plus("argz_add");
2714
free(direntries[i]);
2268
2715
continue;
2269
2716
}
2270
2717
if(debug){
2271
2718
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
2719
direntries[i]->d_name);
2273
2720
}
2721
free(direntries[i]);
2274
2722
}
2275
2723
free(direntries);
2276
2724
} else {
2277
free(direntries);
2725
if(ret == 0){
2726
free(direntries);
2727
}
2278
2728
fprintf_plus(stderr, "Could not find a network interface\n");
2279
2729
exitcode = EXIT_FAILURE;
2280
2730
goto end;
2306
2756
errno = bring_up_interface(interface, delay);
2307
2757
if(not interface_was_up){
2308
2758
if(errno != 0){
2309
perror_plus("Failed to bring up interface");
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2310
2761
} else {
2311
2762
errno = argz_add(&interfaces_to_take_down,
2312
2763
&interfaces_to_take_down_size,
2335
2786
goto end;
2336
2787
}
2337
2788
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2339
2790
if(ret == -1){
2340
2791
fprintf_plus(stderr, "init_gnutls_global failed\n");
2341
2792
exitcode = EX_UNAVAILABLE;
2463
2914
2464
2915
/* Allocate a new server */
2465
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2466
&config, NULL, NULL, &ret_errno);
2917
&config, NULL, NULL, &ret);
2467
2918
2468
2919
/* Free the Avahi configuration data */
2469
2920
avahi_server_config_free(&config);
2472
2923
/* Check if creating the Avahi server object succeeded */
2473
2924
if(mc.server == NULL){
2474
2925
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2475
avahi_strerror(ret_errno));
2926
avahi_strerror(ret));
2476
2927
exitcode = EX_UNAVAILABLE;
2477
2928
goto end;
2478
2929
}
2513
2964
end:
2514
2965
2515
2966
if(debug){
2516
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2517
2974
}
2518
2975
2519
2976
/* Cleanup things */
2530
2987
2531
2988
if(gnutls_initialized){
2532
2989
gnutls_certificate_free_credentials(mc.cred);
2533
gnutls_global_deinit();
2534
2990
gnutls_dh_params_deinit(mc.dh_params);
2535
2991
}
2536
2992
2544
3000
mc.current_server->prev->next = NULL;
2545
3001
while(mc.current_server != NULL){
2546
3002
server *next = mc.current_server->next;
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3006
#endif
3007
free((char *)(mc.current_server->ip));
3008
#ifdef __GNUC__
3009
#pragma GCC diagnostic pop
3010
#endif
2547
3011
free(mc.current_server);
2548
3012
mc.current_server = next;
2549
3013
}
2551
3015
2552
3016
/* Re-raise privileges */
2553
3017
{
2554
ret_errno = raise_privileges();
2555
if(ret_errno != 0){
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
2556
3021
perror_plus("Failed to raise privileges");
2557
3022
} else {
2558
3023
2563
3028
/* Take down the network interfaces which were brought up */
2564
3029
{
2565
3030
char *interface = NULL;
2566
while((interface=argz_next(interfaces_to_take_down,
2567
interfaces_to_take_down_size,
2568
interface))){
2569
ret_errno = take_down_interface(interface);
2570
if(ret_errno != 0){
2571
errno = ret_errno;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
2572
3037
perror_plus("Failed to take down interface");
2573
3038
}
2574
3039
}
2579
3044
}
2580
3045
}
2581
3046
2582
ret_errno = lower_privileges_permanently();
2583
if(ret_errno != 0){
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
2584
3050
perror_plus("Failed to lower privileges permanently");
2585
3051
}
2586
3052
}
2588
3054
free(interfaces_to_take_down);
2589
3055
free(interfaces_hooks);
2590
3056
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
3059
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
3109
}
3110
2591
3111
/* Removes the GPGME temp directory and all files inside */
2592
3112
if(tempdir != NULL){
2593
struct dirent **direntries = NULL;
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2595
if(tempdir_fd == -1){
2596
perror_plus("open");
2597
} else {
2598
#ifdef __GLIBC__
2599
#if __GLIBC_PREREQ(2, 15)
2600
int numentries = scandirat(tempdir_fd, ".", &direntries,
2601
notdotentries, alphasort);
2602
#else /* not __GLIBC_PREREQ(2, 15) */
2603
int numentries = scandir(tempdir, &direntries, notdotentries,
2604
alphasort);
2605
#endif /* not __GLIBC_PREREQ(2, 15) */
2606
#else /* not __GLIBC__ */
2607
int numentries = scandir(tempdir, &direntries, notdotentries,
2608
alphasort);
2609
#endif /* not __GLIBC__ */
2610
if(numentries > 0){
2611
for(int i = 0; i < numentries; i++){
2612
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2613
if(ret == -1){
2614
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2615
" \"%s\", 0): %s\n", tempdir,
2616
direntries[i]->d_name, strerror(errno));
2617
}
2618
}
2619
2620
/* need to clean even if 0 because man page doesn't specify */
2621
free(direntries);
2622
if(numentries == -1){
2623
perror_plus("scandir");
2624
}
2625
ret = rmdir(tempdir);
2626
if(ret == -1 and errno != ENOENT){
2627
perror_plus("rmdir");
2628
}
2629
}
2630
TEMP_FAILURE_RETRY(close(tempdir_fd));
2631
}
3113
clean_dir_at(-1, tempdir, 0);
2632
3114
}
2633
3115
2634
3116
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0