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- Committer: Teddy Hogeborn
- Date: 2014-06-13 22:13:56 UTC
- Revision ID: teddy@recompile.se-20140613221356-b9c36ctxmw4pelja
Fix free() of possibly uninitialized pointer in mandos-client.
* plugins.d/mandos-client (main): Initialize "direntries" to NULL so
it can be free()'d even if scandir()
fails.
* plugins.d/mandos-client (main): Initialize "direntries" to NULL so
it can be free()'d even if scandir()
fails.
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
*/
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(), unlinkat() */
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,
240
234
.af = af };
241
235
if(new_server->ip == NULL){
242
236
perror_plus("strdup");
243
free(new_server);
244
237
return false;
245
238
}
246
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
240
if(ret == -1){
248
241
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
242
return false;
259
243
}
260
244
/* Special case of first server */
311
295
return false;
312
296
}
313
297
314
ret = close(fd);
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
299
if(ret == -1){
316
300
perror_plus("close");
317
301
}
499
483
return plaintext_length;
500
484
}
501
485
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
486
__attribute__((warn_unused_result))
510
487
static const char *safer_gnutls_strerror(int value){
511
488
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
513
492
}
514
493
515
494
/* GnuTLS log function callback */
519
498
fprintf_plus(stderr, "GnuTLS: %s", string);
520
499
}
521
500
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
501
__attribute__((nonnull, warn_unused_result))
523
502
static int init_gnutls_global(const char *pubkeyfilename,
524
503
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
504
mandos_context *mc){
527
505
int ret;
528
unsigned int uret;
529
506
530
507
if(debug){
531
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
509
}
533
510
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
534
518
if(debug){
535
519
/* "Use a log level over 10 to enable all debugging options."
536
520
* - GnuTLS manual
544
528
if(ret != GNUTLS_E_SUCCESS){
545
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
547
532
return -1;
548
533
}
549
534
574
559
safer_gnutls_strerror(ret));
575
560
goto globalfail;
576
561
}
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
}
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
750
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
751
570
752
571
return 0;
754
573
globalfail:
755
574
756
575
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
757
577
gnutls_dh_params_deinit(mc->dh_params);
758
578
return -1;
759
579
}
811
631
/* ignore client certificate if any. */
812
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
813
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
814
636
return 0;
815
637
}
816
638
818
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
819
641
__attribute__((unused)) const char *txt){}
820
642
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
1039
643
/* Called when a Mandos server is found */
1040
644
__attribute__((nonnull, warn_unused_result))
1041
645
static int start_mandos_communication(const char *ip, in_port_t port,
1052
656
int retval = -1;
1053
657
gnutls_session_t session;
1054
658
int pf; /* Protocol family */
1055
bool route_added = false;
1056
659
1057
660
errno = 0;
1058
661
1080
683
bool match = false;
1081
684
{
1082
685
char *interface = NULL;
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1086
688
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
689
match = true;
1088
690
break;
1117
719
PRIuMAX "\n", ip, (uintmax_t)port);
1118
720
}
1119
721
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
723
if(tcp_sd < 0){
1122
724
int e = errno;
1123
725
perror_plus("socket");
1130
732
goto mandos_end;
1131
733
}
1132
734
735
memset(&to, 0, sizeof(to));
1133
736
if(af == AF_INET6){
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);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1137
739
} else { /* IPv4 */
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);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1141
742
}
1142
743
if(ret < 0 ){
1143
744
int e = errno;
1213
814
goto mandos_end;
1214
815
}
1215
816
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;
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;
1271
836
}
1272
837
1273
838
const char *out = mandos_protocol_version;
1427
992
&decrypted_buffer, mc);
1428
993
if(decrypted_buffer_size >= 0){
1429
994
1430
clearerr(stdout);
1431
995
written = 0;
1432
996
while(written < (size_t) decrypted_buffer_size){
1433
997
if(quit_now){
1449
1013
}
1450
1014
written += (size_t)ret;
1451
1015
}
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
}
1462
1016
retval = 0;
1463
1017
}
1464
1018
}
1467
1021
1468
1022
mandos_end:
1469
1023
{
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
}
1476
1024
int e = errno;
1477
1025
free(decrypted_buffer);
1478
1026
free(buffer);
1479
1027
if(tcp_sd >= 0){
1480
ret = close(tcp_sd);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
1029
}
1482
1030
if(ret == -1){
1483
1031
if(e == 0){
1495
1043
return retval;
1496
1044
}
1497
1045
1046
__attribute__((nonnull))
1498
1047
static void resolve_callback(AvahiSServiceResolver *r,
1499
1048
AvahiIfIndex interface,
1500
1049
AvahiProtocol proto,
1517
1066
timed out */
1518
1067
1519
1068
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1521
1069
return;
1522
1070
}
1523
1071
1637
1185
__attribute__((nonnull, warn_unused_result))
1638
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1187
int ret;
1640
int old_errno;
1188
error_t ret_errno;
1641
1189
1642
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1191
if(s < 0){
1644
old_errno = errno;
1192
ret_errno = errno;
1645
1193
perror_plus("socket");
1646
errno = old_errno;
1194
errno = ret_errno;
1647
1195
return false;
1648
1196
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1197
strcpy(ifr->ifr_name, ifname);
1651
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1199
if(ret == -1){
1653
1200
if(debug){
1654
old_errno = errno;
1201
ret_errno = errno;
1655
1202
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1203
errno = ret_errno;
1657
1204
}
1658
1205
return false;
1659
1206
}
1904
1451
}
1905
1452
}
1906
1453
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
1907
1510
__attribute__((nonnull))
1908
1511
void run_network_hooks(const char *mode, const char *interface,
1909
1512
const float delay){
1910
struct dirent **direntries = NULL;
1513
struct dirent **direntries;
1911
1514
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1515
hookdir_fd = open(hookdir, O_RDONLY);
1914
1516
if(hookdir_fd == -1){
1915
1517
if(errno == ENOENT){
1916
1518
if(debug){
1923
1525
return;
1924
1526
}
1925
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1926
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
1531
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__ */
1928
1540
if(numhooks == -1){
1929
1541
perror_plus("scandir");
1930
1542
return;
1931
1543
}
1932
1544
struct dirent *direntry;
1933
1545
int ret;
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
}
1546
int devnull = open("/dev/null", O_RDONLY);
1939
1547
for(int i = 0; i < numhooks; i++){
1940
1548
direntry = direntries[i];
1941
1549
if(debug){
1946
1554
if(hook_pid == 0){
1947
1555
/* Child */
1948
1556
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1557
if(raise_privileges_permanently() != 0){
1951
1558
perror_plus("Failed to raise privileges");
1952
1559
_exit(EX_NOPERM);
1953
1560
}
1965
1572
perror_plus("setgroups");
1966
1573
_exit(EX_NOPERM);
1967
1574
}
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
}
1968
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
1591
if(ret == -1){
1970
1592
perror_plus("setenv");
2005
1627
_exit(EX_OSERR);
2006
1628
}
2007
1629
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2011
1631
if(hook_fd == -1){
2012
1632
perror_plus("openat");
2013
1633
_exit(EXIT_FAILURE);
2014
1634
}
2015
if(close(hookdir_fd) == -1){
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2016
1636
perror_plus("close");
2017
1637
_exit(EXIT_FAILURE);
2018
1638
}
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
}
2034
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
1640
environ) == -1){
2036
1641
perror_plus("fexecve");
2037
1642
_exit(EXIT_FAILURE);
2038
1643
}
2039
1644
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
1645
int status;
2046
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
1647
perror_plus("waitpid");
2048
free(direntry);
2049
1648
continue;
2050
1649
}
2051
1650
if(WIFEXITED(status)){
2053
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
1653
" with status %d\n", direntry->d_name,
2055
1654
WEXITSTATUS(status));
2056
free(direntry);
2057
1655
continue;
2058
1656
}
2059
1657
} else if(WIFSIGNALED(status)){
2060
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
1659
" signal %d\n", direntry->d_name,
2062
1660
WTERMSIG(status));
2063
free(direntry);
2064
1661
continue;
2065
1662
} else {
2066
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
1664
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
1665
continue;
2070
1666
}
2071
1667
}
2073
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
1670
direntry->d_name);
2075
1671
}
2076
free(direntry);
2077
1672
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2080
1674
perror_plus("close");
2081
1675
} else {
2082
1676
hookdir_fd = -1;
2085
1679
}
2086
1680
2087
1681
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
1682
error_t bring_up_interface(const char *const interface,
1683
const float delay){
1684
error_t old_errno = errno;
2091
1685
int ret;
2092
1686
struct ifreq network;
2093
1687
unsigned int if_index = if_nametoindex(interface);
2103
1697
}
2104
1698
2105
1699
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
1700
error_t ret_errno = 0, ioctl_errno = 0;
2108
1701
if(not get_flags(interface, &network)){
2109
1702
ret_errno = errno;
2110
1703
fprintf_plus(stderr, "Failed to get flags for interface "
2123
1716
}
2124
1717
2125
1718
if(quit_now){
2126
ret = close(sd);
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2127
1720
if(ret == -1){
2128
1721
perror_plus("close");
2129
1722
}
2139
1732
/* Raise privileges */
2140
1733
ret_errno = raise_privileges();
2141
1734
if(ret_errno != 0){
2142
errno = ret_errno;
2143
1735
perror_plus("Failed to raise privileges");
2144
1736
}
2145
1737
2179
1771
}
2180
1772
2181
1773
/* Close the socket */
2182
ret = close(sd);
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1775
if(ret == -1){
2184
1776
perror_plus("close");
2185
1777
}
2197
1789
2198
1790
/* Sleep checking until interface is running.
2199
1791
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
1792
for(int i=0; i < delay * 4; i++){
2201
1793
if(interface_is_running(interface)){
2202
1794
break;
2203
1795
}
2213
1805
}
2214
1806
2215
1807
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
1808
error_t take_down_interface(const char *const interface){
1809
error_t old_errno = errno;
2218
1810
struct ifreq network;
2219
1811
unsigned int if_index = if_nametoindex(interface);
2220
1812
if(if_index == 0){
2223
1815
return ENXIO;
2224
1816
}
2225
1817
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
1818
error_t ret_errno = 0, ioctl_errno = 0;
2228
1819
if(not get_flags(interface, &network) and debug){
2229
1820
ret_errno = errno;
2230
1821
fprintf_plus(stderr, "Failed to get flags for interface "
2250
1841
/* Raise privileges */
2251
1842
ret_errno = raise_privileges();
2252
1843
if(ret_errno != 0){
2253
errno = ret_errno;
2254
1844
perror_plus("Failed to raise privileges");
2255
1845
}
2256
1846
2268
1858
}
2269
1859
2270
1860
/* Close the socket */
2271
int ret = close(sd);
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2272
1862
if(ret == -1){
2273
1863
perror_plus("close");
2274
1864
}
2289
1879
}
2290
1880
2291
1881
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
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 };
2297
1886
AvahiSServiceBrowser *sb = NULL;
2298
1887
error_t ret_errno;
2299
1888
int ret;
2308
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2309
1898
const char *seckey = PATHDIR "/" SECKEY;
2310
1899
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
1900
char *interfaces_hooks = NULL;
2313
1901
2314
1902
bool gnutls_initialized = false;
2367
1955
.doc = "Bit length of the prime number used in the"
2368
1956
" Diffie-Hellman key exchange",
2369
1957
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
2375
1958
{ .name = "priority", .key = 130,
2376
1959
.arg = "STRING",
2377
1960
.doc = "GnuTLS priority string for the TLS handshake",
2432
2015
}
2433
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2434
2017
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2438
2018
case 130: /* --priority */
2439
2019
mc.priority = arg;
2440
2020
break;
2480
2060
.args_doc = "",
2481
2061
.doc = "Mandos client -- Get and decrypt"
2482
2062
" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2486
2066
case 0:
2487
2067
break;
2488
2068
case ENOMEM:
2489
2069
default:
2490
errno = ret_errno;
2070
errno = ret;
2491
2071
perror_plus("argp_parse");
2492
2072
exitcode = EX_OSERR;
2493
2073
goto end;
2496
2076
goto end;
2497
2077
}
2498
2078
}
2499
2079
2500
2080
{
2501
2081
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
2082
<http://bugs.debian.org/633582> */
2503
2083
2504
2084
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2508
2088
perror_plus("Failed to raise privileges");
2509
2089
} else {
2510
2090
struct stat st;
2526
2106
}
2527
2107
}
2528
2108
}
2529
close(seckey_fd);
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2530
2110
}
2531
2111
}
2532
2112
2533
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2535
2115
if(pubkey_fd == -1){
2547
2127
}
2548
2128
}
2549
2129
}
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
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2576
2134
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2580
2138
perror_plus("Failed to lower privileges");
2581
2139
}
2582
2140
}
2707
2265
if(ret_errno != 0){
2708
2266
errno = ret_errno;
2709
2267
perror_plus("argz_add");
2710
free(direntries[i]);
2711
2268
continue;
2712
2269
}
2713
2270
if(debug){
2714
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
2272
direntries[i]->d_name);
2716
2273
}
2717
free(direntries[i]);
2718
2274
}
2719
2275
free(direntries);
2720
2276
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2277
free(direntries);
2724
2278
fprintf_plus(stderr, "Could not find a network interface\n");
2725
2279
exitcode = EXIT_FAILURE;
2726
2280
goto end;
2752
2306
errno = bring_up_interface(interface, delay);
2753
2307
if(not interface_was_up){
2754
2308
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2309
perror_plus("Failed to bring up interface");
2757
2310
} else {
2758
2311
errno = argz_add(&interfaces_to_take_down,
2759
2312
&interfaces_to_take_down_size,
2782
2335
goto end;
2783
2336
}
2784
2337
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
2786
2339
if(ret == -1){
2787
2340
fprintf_plus(stderr, "init_gnutls_global failed\n");
2788
2341
exitcode = EX_UNAVAILABLE;
2910
2463
2911
2464
/* Allocate a new server */
2912
2465
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2466
&config, NULL, NULL, &ret_errno);
2914
2467
2915
2468
/* Free the Avahi configuration data */
2916
2469
avahi_server_config_free(&config);
2919
2472
/* Check if creating the Avahi server object succeeded */
2920
2473
if(mc.server == NULL){
2921
2474
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2475
avahi_strerror(ret_errno));
2923
2476
exitcode = EX_UNAVAILABLE;
2924
2477
goto end;
2925
2478
}
2960
2513
end:
2961
2514
2962
2515
if(debug){
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2516
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
2517
}
2971
2518
2972
2519
/* Cleanup things */
2983
2530
2984
2531
if(gnutls_initialized){
2985
2532
gnutls_certificate_free_credentials(mc.cred);
2533
gnutls_global_deinit();
2986
2534
gnutls_dh_params_deinit(mc.dh_params);
2987
2535
}
2988
2536
2996
2544
mc.current_server->prev->next = NULL;
2997
2545
while(mc.current_server != NULL){
2998
2546
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
3007
2547
free(mc.current_server);
3008
2548
mc.current_server = next;
3009
2549
}
3011
2551
3012
2552
/* Re-raise privileges */
3013
2553
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
2554
ret_errno = raise_privileges();
2555
if(ret_errno != 0){
3017
2556
perror_plus("Failed to raise privileges");
3018
2557
} else {
3019
2558
3024
2563
/* Take down the network interfaces which were brought up */
3025
2564
{
3026
2565
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
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;
3033
2572
perror_plus("Failed to take down interface");
3034
2573
}
3035
2574
}
3040
2579
}
3041
2580
}
3042
2581
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
2582
ret_errno = lower_privileges_permanently();
2583
if(ret_errno != 0){
3046
2584
perror_plus("Failed to lower privileges permanently");
3047
2585
}
3048
2586
}
3050
2588
free(interfaces_to_take_down);
3051
2589
free(interfaces_hooks);
3052
2590
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
3109
2591
/* Removes the GPGME temp directory and all files inside */
3110
2592
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2593
struct dirent **direntries = NULL;
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2595
O_NOFOLLOW));
2596
if(tempdir_fd == -1){
2597
perror_plus("open");
2598
} else {
2599
#ifdef __GLIBC__
2600
#if __GLIBC_PREREQ(2, 15)
2601
int numentries = scandirat(tempdir_fd, ".", &direntries,
2602
notdotentries, alphasort);
2603
#else /* not __GLIBC_PREREQ(2, 15) */
2604
int numentries = scandir(tempdir, &direntries, notdotentries,
2605
alphasort);
2606
#endif /* not __GLIBC_PREREQ(2, 15) */
2607
#else /* not __GLIBC__ */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC__ */
2611
if(numentries > 0){
2612
for(int i = 0; i < numentries; i++){
2613
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2614
if(ret == -1){
2615
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2616
" \"%s\", 0): %s\n", tempdir,
2617
direntries[i]->d_name, strerror(errno));
2618
}
2619
}
2620
2621
/* need to clean even if 0 because man page doesn't specify */
2622
free(direntries);
2623
if(numentries == -1){
2624
perror_plus("scandir");
2625
}
2626
ret = rmdir(tempdir);
2627
if(ret == -1 and errno != ENOENT){
2628
perror_plus("rmdir");
2629
}
2630
}
2631
TEMP_FAILURE_RETRY(close(tempdir_fd));
2632
}
3112
2633
}
3113
2634
3114
2635
if(quit_now){
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