To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 925
- compare with another revision
- download diff
- download tarball
- view history from revision 925
- Committer: Teddy Hogeborn
- Date: 2018-02-08 12:25:31 UTC
- Revision ID: teddy@recompile.se-20180208122531-v3xrzi5xafudv2pc
Eliminate unnecessary shell commands in Debian package rules
* debian/rules (override_dh_fixperms-arch): Use the DEB_HOST_MULTIARCH
variable directly instead of shelling out to "dpkg-architecture".
* debian/rules (override_dh_fixperms-arch): Use the DEB_HOST_MULTIARCH
variable directly instead of shelling out to "dpkg-architecture".
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
if(params.data == NULL){
617
dhparamsfilename = NULL;
618
}
619
if(dhparamsfilename == NULL){
620
break;
621
}
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
629
}
630
free(params.data);
631
} while(false);
632
}
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
do {
639
int secfile = open(seckeyfilename, O_RDONLY);
640
if(secfile == -1){
641
perror_plus("open");
642
break;
643
}
644
size_t buffer_capacity = 0;
645
while(true){
646
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer.size,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
651
free(buffer.data);
652
buffer.data = NULL;
653
break;
654
}
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
657
BUFFER_SIZE);
658
/* EOF */
659
if(bytes_read == 0){
660
break;
661
}
662
/* check bytes_read for failure */
663
if(bytes_read < 0){
664
perror_plus("read");
665
free(buffer.data);
666
buffer.data = NULL;
667
break;
668
}
669
buffer.size += (unsigned int)bytes_read;
670
}
671
close(secfile);
672
} while(false);
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
676
{
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
" structure: %s",
682
safer_gnutls_strerror(ret));
683
free(buffer.data);
684
buffer.data = NULL;
685
} else {
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
691
privkey = NULL;
692
}
693
free(buffer.data);
694
buffer.data = NULL;
695
if(privkey != NULL){
696
/* Use private key to suggest an appropriate
697
sec_param */
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
700
if(debug){
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
704
(sec_param)));
705
}
706
}
707
}
708
}
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
if(debug){
713
fprintf_plus(stderr, "Falling back to security parameter"
714
" \"%s\"\n",
715
safe_string(gnutls_sec_param_get_name
716
(sec_param)));
717
}
718
}
719
}
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
if(uret != 0){
722
mc->dh_bits = uret;
723
if(debug){
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
mc->dh_bits);
729
}
730
} else {
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
734
(sec_param)),
735
safer_gnutls_strerror(ret));
736
goto globalfail;
737
}
738
} else if(debug){
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
mc->dh_bits);
741
}
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
747
goto globalfail;
748
}
749
}
569
750
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
570
751
571
752
return 0;
573
754
globalfail:
574
755
575
756
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
577
757
gnutls_dh_params_deinit(mc->dh_params);
578
758
return -1;
579
759
}
631
811
/* ignore client certificate if any. */
632
812
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
813
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
636
814
return 0;
637
815
}
638
816
640
818
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
641
819
__attribute__((unused)) const char *txt){}
642
820
821
/* Set effective uid to 0, return errno */
822
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
826
if(seteuid(0) == -1){
827
ret = errno;
828
}
829
errno = old_errno;
830
return ret;
831
}
832
833
/* Set effective and real user ID to 0. Return errno. */
834
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
839
errno = old_errno;
840
return ret;
841
}
842
if(setuid(0) == -1){
843
ret = errno;
844
}
845
errno = old_errno;
846
return ret;
847
}
848
849
/* Set effective user ID to unprivileged saved user ID */
850
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
854
if(seteuid(uid) == -1){
855
ret = errno;
856
}
857
errno = old_errno;
858
return ret;
859
}
860
861
/* Lower privileges permanently */
862
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
866
if(setuid(uid) == -1){
867
ret = errno;
868
}
869
errno = old_errno;
870
return ret;
871
}
872
873
/* Helper function to add_local_route() and delete_local_route() */
874
__attribute__((nonnull, warn_unused_result))
875
static bool add_delete_local_route(const bool add,
876
const char *address,
877
AvahiIfIndex if_index){
878
int ret;
879
char helper[] = "mandos-client-iprouteadddel";
880
char add_arg[] = "add";
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
884
if(pluginhelperdir == NULL){
885
if(debug){
886
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
887
" variable not set; cannot run helper\n");
888
}
889
return false;
890
}
891
892
char interface[IF_NAMESIZE];
893
if(if_indextoname((unsigned int)if_index, interface) == NULL){
894
perror_plus("if_indextoname");
895
return false;
896
}
897
898
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
if(devnull == -1){
900
perror_plus("open(\"/dev/null\", O_RDONLY)");
901
return false;
902
}
903
pid_t pid = fork();
904
if(pid == 0){
905
/* Child */
906
/* Raise privileges */
907
errno = raise_privileges_permanently();
908
if(errno != 0){
909
perror_plus("Failed to raise privileges");
910
/* _exit(EX_NOPERM); */
911
} else {
912
/* Set group */
913
errno = 0;
914
ret = setgid(0);
915
if(ret == -1){
916
perror_plus("setgid");
917
_exit(EX_NOPERM);
918
}
919
/* Reset supplementary groups */
920
errno = 0;
921
ret = setgroups(0, NULL);
922
if(ret == -1){
923
perror_plus("setgroups");
924
_exit(EX_NOPERM);
925
}
926
}
927
ret = dup2(devnull, STDIN_FILENO);
928
if(ret == -1){
929
perror_plus("dup2(devnull, STDIN_FILENO)");
930
_exit(EX_OSERR);
931
}
932
ret = close(devnull);
933
if(ret == -1){
934
perror_plus("close");
935
_exit(EX_OSERR);
936
}
937
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
if(ret == -1){
939
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
_exit(EX_OSERR);
941
}
942
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
943
O_RDONLY
944
| O_DIRECTORY
945
| O_PATH
946
| O_CLOEXEC));
947
if(helperdir_fd == -1){
948
perror_plus("open");
949
_exit(EX_UNAVAILABLE);
950
}
951
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
helper, O_RDONLY));
953
if(helper_fd == -1){
954
perror_plus("openat");
955
close(helperdir_fd);
956
_exit(EX_UNAVAILABLE);
957
}
958
close(helperdir_fd);
959
#ifdef __GNUC__
960
#pragma GCC diagnostic push
961
#pragma GCC diagnostic ignored "-Wcast-qual"
962
#endif
963
if(fexecve(helper_fd, (char *const [])
964
{ helper, add ? add_arg : delete_arg, (char *)address,
965
interface, debug ? debug_flag : NULL, NULL },
966
environ) == -1){
967
#ifdef __GNUC__
968
#pragma GCC diagnostic pop
969
#endif
970
perror_plus("fexecve");
971
_exit(EXIT_FAILURE);
972
}
973
}
974
if(pid == -1){
975
perror_plus("fork");
976
return false;
977
}
978
int status;
979
pid_t pret = -1;
980
errno = 0;
981
do {
982
pret = waitpid(pid, &status, 0);
983
if(pret == -1 and errno == EINTR and quit_now){
984
int errno_raising = 0;
985
if((errno = raise_privileges()) != 0){
986
errno_raising = errno;
987
perror_plus("Failed to raise privileges in order to"
988
" kill helper program");
989
}
990
if(kill(pid, SIGTERM) == -1){
991
perror_plus("kill");
992
}
993
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
994
perror_plus("Failed to lower privileges after killing"
995
" helper program");
996
}
997
return false;
998
}
999
} while(pret == -1 and errno == EINTR);
1000
if(pret == -1){
1001
perror_plus("waitpid");
1002
return false;
1003
}
1004
if(WIFEXITED(status)){
1005
if(WEXITSTATUS(status) != 0){
1006
fprintf_plus(stderr, "Error: iprouteadddel exited"
1007
" with status %d\n", WEXITSTATUS(status));
1008
return false;
1009
}
1010
return true;
1011
}
1012
if(WIFSIGNALED(status)){
1013
fprintf_plus(stderr, "Error: iprouteadddel died by"
1014
" signal %d\n", WTERMSIG(status));
1015
return false;
1016
}
1017
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
return false;
1019
}
1020
1021
__attribute__((nonnull, warn_unused_result))
1022
static bool add_local_route(const char *address,
1023
AvahiIfIndex if_index){
1024
if(debug){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
}
1027
return add_delete_local_route(true, address, if_index);
1028
}
1029
1030
__attribute__((nonnull, warn_unused_result))
1031
static bool delete_local_route(const char *address,
1032
AvahiIfIndex if_index){
1033
if(debug){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
}
1036
return add_delete_local_route(false, address, if_index);
1037
}
1038
643
1039
/* Called when a Mandos server is found */
644
1040
__attribute__((nonnull, warn_unused_result))
645
1041
static int start_mandos_communication(const char *ip, in_port_t port,
656
1052
int retval = -1;
657
1053
gnutls_session_t session;
658
1054
int pf; /* Protocol family */
1055
bool route_added = false;
659
1056
660
1057
errno = 0;
661
1058
683
1080
bool match = false;
684
1081
{
685
1082
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
688
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
689
1087
match = true;
690
1088
break;
719
1117
PRIuMAX "\n", ip, (uintmax_t)port);
720
1118
}
721
1119
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
723
1121
if(tcp_sd < 0){
724
1122
int e = errno;
725
1123
perror_plus("socket");
732
1130
goto mandos_end;
733
1131
}
734
1132
735
memset(&to, 0, sizeof(to));
736
1133
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);
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
739
1137
} 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);
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
742
1141
}
743
1142
if(ret < 0 ){
744
1143
int e = errno;
814
1213
goto mandos_end;
815
1214
}
816
1215
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;
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
836
1271
}
837
1272
838
1273
const char *out = mandos_protocol_version;
992
1427
&decrypted_buffer, mc);
993
1428
if(decrypted_buffer_size >= 0){
994
1429
1430
clearerr(stdout);
995
1431
written = 0;
996
1432
while(written < (size_t) decrypted_buffer_size){
997
1433
if(quit_now){
1013
1449
}
1014
1450
written += (size_t)ret;
1015
1451
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
1016
1462
retval = 0;
1017
1463
}
1018
1464
}
1021
1467
1022
1468
mandos_end:
1023
1469
{
1470
if(route_added){
1471
if(not delete_local_route(ip, if_index)){
1472
fprintf_plus(stderr, "Failed to delete local route to %s on"
1473
" interface %d", ip, if_index);
1474
}
1475
}
1024
1476
int e = errno;
1025
1477
free(decrypted_buffer);
1026
1478
free(buffer);
1027
1479
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
ret = close(tcp_sd);
1029
1481
}
1030
1482
if(ret == -1){
1031
1483
if(e == 0){
1043
1495
return retval;
1044
1496
}
1045
1497
1046
__attribute__((nonnull))
1047
1498
static void resolve_callback(AvahiSServiceResolver *r,
1048
1499
AvahiIfIndex interface,
1049
1500
AvahiProtocol proto,
1066
1517
timed out */
1067
1518
1068
1519
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1069
1521
return;
1070
1522
}
1071
1523
1185
1637
__attribute__((nonnull, warn_unused_result))
1186
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1639
int ret;
1188
error_t ret_errno;
1640
int old_errno;
1189
1641
1190
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1643
if(s < 0){
1192
ret_errno = errno;
1644
old_errno = errno;
1193
1645
perror_plus("socket");
1194
errno = ret_errno;
1646
errno = old_errno;
1195
1647
return false;
1196
1648
}
1197
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1198
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1652
if(ret == -1){
1200
1653
if(debug){
1201
ret_errno = errno;
1654
old_errno = errno;
1202
1655
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1656
errno = old_errno;
1204
1657
}
1205
1658
return false;
1206
1659
}
1451
1904
}
1452
1905
}
1453
1906
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
}
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
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1506
1907
__attribute__((nonnull))
1507
1908
void run_network_hooks(const char *mode, const char *interface,
1508
1909
const float delay){
1509
1910
struct dirent **direntries = NULL;
1510
1911
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1512
1914
if(hookdir_fd == -1){
1513
1915
if(errno == ENOENT){
1514
1916
if(debug){
1521
1923
return;
1522
1924
}
1523
1925
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1526
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
1927
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1536
1928
if(numhooks == -1){
1537
1929
perror_plus("scandir");
1538
1930
return;
1539
1931
}
1540
1932
struct dirent *direntry;
1541
1933
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1543
1939
for(int i = 0; i < numhooks; i++){
1544
1940
direntry = direntries[i];
1545
1941
if(debug){
1569
1965
perror_plus("setgroups");
1570
1966
_exit(EX_NOPERM);
1571
1967
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
1969
if(ret == -1){
1589
1970
perror_plus("setenv");
1624
2005
_exit(EX_OSERR);
1625
2006
}
1626
2007
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
1628
2011
if(hook_fd == -1){
1629
2012
perror_plus("openat");
1630
2013
_exit(EXIT_FAILURE);
1631
2014
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
if(close(hookdir_fd) == -1){
1633
2016
perror_plus("close");
1634
2017
_exit(EXIT_FAILURE);
1635
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
1636
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
2035
environ) == -1){
1638
2036
perror_plus("fexecve");
1639
2037
_exit(EXIT_FAILURE);
1640
2038
}
1641
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
1642
2045
int status;
1643
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
2047
perror_plus("waitpid");
2048
free(direntry);
1645
2049
continue;
1646
2050
}
1647
2051
if(WIFEXITED(status)){
1649
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
2054
" with status %d\n", direntry->d_name,
1651
2055
WEXITSTATUS(status));
2056
free(direntry);
1652
2057
continue;
1653
2058
}
1654
2059
} else if(WIFSIGNALED(status)){
1655
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
2061
" signal %d\n", direntry->d_name,
1657
2062
WTERMSIG(status));
2063
free(direntry);
1658
2064
continue;
1659
2065
} else {
1660
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
1662
2069
continue;
1663
2070
}
1664
2071
}
1666
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
2074
direntry->d_name);
1668
2075
}
2076
free(direntry);
1669
2077
}
1670
2078
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2079
if(close(hookdir_fd) == -1){
1672
2080
perror_plus("close");
1673
2081
} else {
1674
2082
hookdir_fd = -1;
1677
2085
}
1678
2086
1679
2087
__attribute__((nonnull, warn_unused_result))
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
1683
2091
int ret;
1684
2092
struct ifreq network;
1685
2093
unsigned int if_index = if_nametoindex(interface);
1695
2103
}
1696
2104
1697
2105
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
1699
2108
if(not get_flags(interface, &network)){
1700
2109
ret_errno = errno;
1701
2110
fprintf_plus(stderr, "Failed to get flags for interface "
1714
2123
}
1715
2124
1716
2125
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2126
ret = close(sd);
1718
2127
if(ret == -1){
1719
2128
perror_plus("close");
1720
2129
}
1770
2179
}
1771
2180
1772
2181
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
ret = close(sd);
1774
2183
if(ret == -1){
1775
2184
perror_plus("close");
1776
2185
}
1788
2197
1789
2198
/* Sleep checking until interface is running.
1790
2199
Check every 0.25s, up to total time of delay */
1791
for(int i=0; i < delay * 4; i++){
2200
for(int i = 0; i < delay * 4; i++){
1792
2201
if(interface_is_running(interface)){
1793
2202
break;
1794
2203
}
1804
2213
}
1805
2214
1806
2215
__attribute__((nonnull, warn_unused_result))
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
1809
2218
struct ifreq network;
1810
2219
unsigned int if_index = if_nametoindex(interface);
1811
2220
if(if_index == 0){
1814
2223
return ENXIO;
1815
2224
}
1816
2225
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
1818
2228
if(not get_flags(interface, &network) and debug){
1819
2229
ret_errno = errno;
1820
2230
fprintf_plus(stderr, "Failed to get flags for interface "
1858
2268
}
1859
2269
1860
2270
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
int ret = close(sd);
1862
2272
if(ret == -1){
1863
2273
perror_plus("close");
1864
2274
}
1879
2289
}
1880
2290
1881
2291
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 };
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1886
2297
AvahiSServiceBrowser *sb = NULL;
1887
2298
error_t ret_errno;
1888
2299
int ret;
1897
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
2309
const char *seckey = PATHDIR "/" SECKEY;
1899
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
1900
2312
char *interfaces_hooks = NULL;
1901
2313
1902
2314
bool gnutls_initialized = false;
1955
2367
.doc = "Bit length of the prime number used in the"
1956
2368
" Diffie-Hellman key exchange",
1957
2369
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
1958
2375
{ .name = "priority", .key = 130,
1959
2376
.arg = "STRING",
1960
2377
.doc = "GnuTLS priority string for the TLS handshake",
2015
2432
}
2016
2433
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2017
2434
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2018
2438
case 130: /* --priority */
2019
2439
mc.priority = arg;
2020
2440
break;
2060
2480
.args_doc = "",
2061
2481
.doc = "Mandos client -- Get and decrypt"
2062
2482
" passwords from a Mandos server" };
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
2066
2486
case 0:
2067
2487
break;
2068
2488
case ENOMEM:
2069
2489
default:
2070
errno = ret;
2490
errno = ret_errno;
2071
2491
perror_plus("argp_parse");
2072
2492
exitcode = EX_OSERR;
2073
2493
goto end;
2076
2496
goto end;
2077
2497
}
2078
2498
}
2079
2499
2080
2500
{
2081
2501
/* Work around Debian bug #633582:
2082
<http://bugs.debian.org/633582> */
2502
<https://bugs.debian.org/633582> */
2083
2503
2084
2504
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2088
2508
perror_plus("Failed to raise privileges");
2089
2509
} else {
2090
2510
struct stat st;
2106
2526
}
2107
2527
}
2108
2528
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
close(seckey_fd);
2110
2530
}
2111
2531
}
2112
2532
2113
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
2534
int pubkey_fd = open(pubkey, O_RDONLY);
2115
2535
if(pubkey_fd == -1){
2127
2547
}
2128
2548
}
2129
2549
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
2134
2576
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2138
2580
perror_plus("Failed to lower privileges");
2139
2581
}
2140
2582
}
2265
2707
if(ret_errno != 0){
2266
2708
errno = ret_errno;
2267
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2268
2711
continue;
2269
2712
}
2270
2713
if(debug){
2271
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
2715
direntries[i]->d_name);
2273
2716
}
2717
free(direntries[i]);
2274
2718
}
2275
2719
free(direntries);
2276
2720
} else {
2308
2752
errno = bring_up_interface(interface, delay);
2309
2753
if(not interface_was_up){
2310
2754
if(errno != 0){
2311
perror_plus("Failed to bring up interface");
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2312
2757
} else {
2313
2758
errno = argz_add(&interfaces_to_take_down,
2314
2759
&interfaces_to_take_down_size,
2337
2782
goto end;
2338
2783
}
2339
2784
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2341
2786
if(ret == -1){
2342
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
2343
2788
exitcode = EX_UNAVAILABLE;
2465
2910
2466
2911
/* Allocate a new server */
2467
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
2913
&config, NULL, NULL, &ret);
2469
2914
2470
2915
/* Free the Avahi configuration data */
2471
2916
avahi_server_config_free(&config);
2474
2919
/* Check if creating the Avahi server object succeeded */
2475
2920
if(mc.server == NULL){
2476
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2477
avahi_strerror(ret_errno));
2922
avahi_strerror(ret));
2478
2923
exitcode = EX_UNAVAILABLE;
2479
2924
goto end;
2480
2925
}
2515
2960
end:
2516
2961
2517
2962
if(debug){
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2519
2970
}
2520
2971
2521
2972
/* Cleanup things */
2532
2983
2533
2984
if(gnutls_initialized){
2534
2985
gnutls_certificate_free_credentials(mc.cred);
2535
gnutls_global_deinit();
2536
2986
gnutls_dh_params_deinit(mc.dh_params);
2537
2987
}
2538
2988
2546
2996
mc.current_server->prev->next = NULL;
2547
2997
while(mc.current_server != NULL){
2548
2998
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
2549
3007
free(mc.current_server);
2550
3008
mc.current_server = next;
2551
3009
}
2553
3011
2554
3012
/* Re-raise privileges */
2555
3013
{
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
2559
3017
perror_plus("Failed to raise privileges");
2560
3018
} else {
2561
3019
2566
3024
/* Take down the network interfaces which were brought up */
2567
3025
{
2568
3026
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
2575
3033
perror_plus("Failed to take down interface");
2576
3034
}
2577
3035
}
2582
3040
}
2583
3041
}
2584
3042
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
2588
3046
perror_plus("Failed to lower privileges permanently");
2589
3047
}
2590
3048
}
2592
3050
free(interfaces_to_take_down);
2593
3051
free(interfaces_hooks);
2594
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
2595
3109
/* Removes the GPGME temp directory and all files inside */
2596
3110
if(tempdir != NULL){
2597
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2634
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2636
}
3111
clean_dir_at(-1, tempdir, 0);
2637
3112
}
2638
3113
2639
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0