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- Committer: Teddy Hogeborn
- Date: 2014-06-08 00:13:06 UTC
- Revision ID: teddy@recompile.se-20140608001306-ums93iqhkvztj7u1
Make mandos-client use unlinkat() instead of remove().
* plugins.d/mandos-client.d (main): Replace remove() with unlinkat().
* plugins.d/mandos-client.d (main): Replace remove() with unlinkat().
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
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
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
754
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
755
570
756
571
return 0;
758
573
globalfail:
759
574
760
575
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
761
577
gnutls_dh_params_deinit(mc->dh_params);
762
578
return -1;
763
579
}
815
631
/* ignore client certificate if any. */
816
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
817
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
818
636
return 0;
819
637
}
820
638
822
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
823
641
__attribute__((unused)) const char *txt){}
824
642
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
1043
643
/* Called when a Mandos server is found */
1044
644
__attribute__((nonnull, warn_unused_result))
1045
645
static int start_mandos_communication(const char *ip, in_port_t port,
1056
656
int retval = -1;
1057
657
gnutls_session_t session;
1058
658
int pf; /* Protocol family */
1059
bool route_added = false;
1060
659
1061
660
errno = 0;
1062
661
1084
683
bool match = false;
1085
684
{
1086
685
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1090
688
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
689
match = true;
1092
690
break;
1121
719
PRIuMAX "\n", ip, (uintmax_t)port);
1122
720
}
1123
721
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1125
723
if(tcp_sd < 0){
1126
724
int e = errno;
1127
725
perror_plus("socket");
1134
732
goto mandos_end;
1135
733
}
1136
734
735
memset(&to, 0, sizeof(to));
1137
736
if(af == AF_INET6){
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1141
739
} else { /* IPv4 */
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1145
742
}
1146
743
if(ret < 0 ){
1147
744
int e = errno;
1217
814
goto mandos_end;
1218
815
}
1219
816
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
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;
1275
836
}
1276
837
1277
838
const char *out = mandos_protocol_version;
1431
992
&decrypted_buffer, mc);
1432
993
if(decrypted_buffer_size >= 0){
1433
994
1434
clearerr(stdout);
1435
995
written = 0;
1436
996
while(written < (size_t) decrypted_buffer_size){
1437
997
if(quit_now){
1453
1013
}
1454
1014
written += (size_t)ret;
1455
1015
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1466
1016
retval = 0;
1467
1017
}
1468
1018
}
1471
1021
1472
1022
mandos_end:
1473
1023
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
1480
1024
int e = errno;
1481
1025
free(decrypted_buffer);
1482
1026
free(buffer);
1483
1027
if(tcp_sd >= 0){
1484
ret = close(tcp_sd);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1485
1029
}
1486
1030
if(ret == -1){
1487
1031
if(e == 0){
1499
1043
return retval;
1500
1044
}
1501
1045
1046
__attribute__((nonnull))
1502
1047
static void resolve_callback(AvahiSServiceResolver *r,
1503
1048
AvahiIfIndex interface,
1504
1049
AvahiProtocol proto,
1521
1066
timed out */
1522
1067
1523
1068
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1525
1069
return;
1526
1070
}
1527
1071
1641
1185
__attribute__((nonnull, warn_unused_result))
1642
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
1187
int ret;
1644
int old_errno;
1188
error_t ret_errno;
1645
1189
1646
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
1191
if(s < 0){
1648
old_errno = errno;
1192
ret_errno = errno;
1649
1193
perror_plus("socket");
1650
errno = old_errno;
1194
errno = ret_errno;
1651
1195
return false;
1652
1196
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1197
strcpy(ifr->ifr_name, ifname);
1655
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
1199
if(ret == -1){
1657
1200
if(debug){
1658
old_errno = errno;
1201
ret_errno = errno;
1659
1202
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1203
errno = ret_errno;
1666
1204
}
1667
1205
return false;
1668
1206
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
1207
return true;
1675
1208
}
1676
1209
1918
1451
}
1919
1452
}
1920
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
1510
#ifndef O_CLOEXEC
1511
/*
1512
* Based on the example in the GNU LibC manual chapter 13.13 "File
1513
* Descriptor Flags".
1514
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1515
*/
1516
__attribute__((warn_unused_result))
1517
static int set_cloexec_flag(int fd){
1518
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1519
/* If reading the flags failed, return error indication now. */
1520
if(ret < 0){
1521
return ret;
1522
}
1523
/* Store modified flag word in the descriptor. */
1524
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1525
ret | FD_CLOEXEC));
1526
}
1527
#endif /* not O_CLOEXEC */
1528
1921
1529
__attribute__((nonnull))
1922
1530
void run_network_hooks(const char *mode, const char *interface,
1923
1531
const float delay){
1924
struct dirent **direntries = NULL;
1532
struct dirent **direntries;
1925
1533
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1534
hookdir_fd = open(hookdir, O_RDONLY |
1535
#ifdef O_CLOEXEC
1536
O_CLOEXEC
1537
#else /* not O_CLOEXEC */
1538
0
1539
#endif /* not O_CLOEXEC */
1540
);
1928
1541
if(hookdir_fd == -1){
1929
1542
if(errno == ENOENT){
1930
1543
if(debug){
1936
1549
}
1937
1550
return;
1938
1551
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1552
#ifndef O_CLOEXEC
1553
if(set_cloexec_flag(hookdir_fd) < 0){
1554
perror_plus("set_cloexec_flag");
1555
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1556
perror_plus("close");
1557
} else {
1558
hookdir_fd = -1;
1559
}
1560
return;
1561
}
1562
#endif /* not O_CLOEXEC */
1563
}
1564
#ifdef __GLIBC__
1565
#if __GLIBC_PREREQ(2, 15)
1945
1566
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
1567
runnable_hook, alphasort);
1568
#else /* not __GLIBC_PREREQ(2, 15) */
1569
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1570
alphasort);
1571
#endif /* not __GLIBC_PREREQ(2, 15) */
1572
#else /* not __GLIBC__ */
1573
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1574
alphasort);
1575
#endif /* not __GLIBC__ */
1947
1576
if(numhooks == -1){
1948
1577
perror_plus("scandir");
1949
close(devnull);
1950
1578
return;
1951
1579
}
1952
1580
struct dirent *direntry;
1953
1581
int ret;
1582
int devnull = open("/dev/null", O_RDONLY);
1954
1583
for(int i = 0; i < numhooks; i++){
1955
1584
direntry = direntries[i];
1956
1585
if(debug){
1961
1590
if(hook_pid == 0){
1962
1591
/* Child */
1963
1592
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1593
if(raise_privileges_permanently() != 0){
1966
1594
perror_plus("Failed to raise privileges");
1967
1595
_exit(EX_NOPERM);
1968
1596
}
1980
1608
perror_plus("setgroups");
1981
1609
_exit(EX_NOPERM);
1982
1610
}
1611
ret = dup2(devnull, STDIN_FILENO);
1612
if(ret == -1){
1613
perror_plus("dup2(devnull, STDIN_FILENO)");
1614
_exit(EX_OSERR);
1615
}
1616
ret = close(devnull);
1617
if(ret == -1){
1618
perror_plus("close");
1619
_exit(EX_OSERR);
1620
}
1621
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1622
if(ret == -1){
1623
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1624
_exit(EX_OSERR);
1625
}
1983
1626
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
1627
if(ret == -1){
1985
1628
perror_plus("setenv");
2020
1663
_exit(EX_OSERR);
2021
1664
}
2022
1665
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
1666
if(fexecve(hookdir_fd, (char *const [])
1667
{ direntry->d_name, NULL }, environ) == -1){
2051
1668
perror_plus("fexecve");
2052
1669
_exit(EXIT_FAILURE);
2053
1670
}
2054
1671
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
1672
int status;
2061
1673
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
1674
perror_plus("waitpid");
2063
free(direntry);
2064
1675
continue;
2065
1676
}
2066
1677
if(WIFEXITED(status)){
2068
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
1680
" with status %d\n", direntry->d_name,
2070
1681
WEXITSTATUS(status));
2071
free(direntry);
2072
1682
continue;
2073
1683
}
2074
1684
} else if(WIFSIGNALED(status)){
2075
1685
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
1686
" signal %d\n", direntry->d_name,
2077
1687
WTERMSIG(status));
2078
free(direntry);
2079
1688
continue;
2080
1689
} else {
2081
1690
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
1691
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
1692
continue;
2085
1693
}
2086
1694
}
2088
1696
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
1697
direntry->d_name);
2090
1698
}
2091
free(direntry);
2092
1699
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
1700
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2095
1701
perror_plus("close");
2096
1702
} else {
2097
1703
hookdir_fd = -1;
2100
1706
}
2101
1707
2102
1708
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
1709
error_t bring_up_interface(const char *const interface,
1710
const float delay){
1711
error_t old_errno = errno;
2106
1712
int ret;
2107
1713
struct ifreq network;
2108
1714
unsigned int if_index = if_nametoindex(interface);
2118
1724
}
2119
1725
2120
1726
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
1727
error_t ret_errno = 0, ioctl_errno = 0;
2123
1728
if(not get_flags(interface, &network)){
2124
1729
ret_errno = errno;
2125
1730
fprintf_plus(stderr, "Failed to get flags for interface "
2138
1743
}
2139
1744
2140
1745
if(quit_now){
2141
ret = close(sd);
1746
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2142
1747
if(ret == -1){
2143
1748
perror_plus("close");
2144
1749
}
2154
1759
/* Raise privileges */
2155
1760
ret_errno = raise_privileges();
2156
1761
if(ret_errno != 0){
2157
errno = ret_errno;
2158
1762
perror_plus("Failed to raise privileges");
2159
1763
}
2160
1764
2194
1798
}
2195
1799
2196
1800
/* Close the socket */
2197
ret = close(sd);
1801
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2198
1802
if(ret == -1){
2199
1803
perror_plus("close");
2200
1804
}
2212
1816
2213
1817
/* Sleep checking until interface is running.
2214
1818
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
1819
for(int i=0; i < delay * 4; i++){
2216
1820
if(interface_is_running(interface)){
2217
1821
break;
2218
1822
}
2228
1832
}
2229
1833
2230
1834
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
1835
error_t take_down_interface(const char *const interface){
1836
error_t old_errno = errno;
2233
1837
struct ifreq network;
2234
1838
unsigned int if_index = if_nametoindex(interface);
2235
1839
if(if_index == 0){
2238
1842
return ENXIO;
2239
1843
}
2240
1844
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
1845
error_t ret_errno = 0, ioctl_errno = 0;
2243
1846
if(not get_flags(interface, &network) and debug){
2244
1847
ret_errno = errno;
2245
1848
fprintf_plus(stderr, "Failed to get flags for interface "
2265
1868
/* Raise privileges */
2266
1869
ret_errno = raise_privileges();
2267
1870
if(ret_errno != 0){
2268
errno = ret_errno;
2269
1871
perror_plus("Failed to raise privileges");
2270
1872
}
2271
1873
2283
1885
}
2284
1886
2285
1887
/* Close the socket */
2286
int ret = close(sd);
1888
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2287
1889
if(ret == -1){
2288
1890
perror_plus("close");
2289
1891
}
2304
1906
}
2305
1907
2306
1908
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1909
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1910
.priority = "SECURE256:!CTYPE-X.509:"
1911
"+CTYPE-OPENPGP", .current_server = NULL,
1912
.interfaces = NULL, .interfaces_size = 0 };
2312
1913
AvahiSServiceBrowser *sb = NULL;
2313
1914
error_t ret_errno;
2314
1915
int ret;
2323
1924
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
1925
const char *seckey = PATHDIR "/" SECKEY;
2325
1926
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
1927
char *interfaces_hooks = NULL;
2328
1928
2329
1929
bool gnutls_initialized = false;
2382
1982
.doc = "Bit length of the prime number used in the"
2383
1983
" Diffie-Hellman key exchange",
2384
1984
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
2390
1985
{ .name = "priority", .key = 130,
2391
1986
.arg = "STRING",
2392
1987
.doc = "GnuTLS priority string for the TLS handshake",
2447
2042
}
2448
2043
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2449
2044
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2453
2045
case 130: /* --priority */
2454
2046
mc.priority = arg;
2455
2047
break;
2495
2087
.args_doc = "",
2496
2088
.doc = "Mandos client -- Get and decrypt"
2497
2089
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2090
ret = argp_parse(&argp, argc, argv,
2091
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2092
switch(ret){
2501
2093
case 0:
2502
2094
break;
2503
2095
case ENOMEM:
2504
2096
default:
2505
errno = ret_errno;
2097
errno = ret;
2506
2098
perror_plus("argp_parse");
2507
2099
exitcode = EX_OSERR;
2508
2100
goto end;
2511
2103
goto end;
2512
2104
}
2513
2105
}
2514
2106
2515
2107
{
2516
2108
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2109
<http://bugs.debian.org/633582> */
2518
2110
2519
2111
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2112
ret_errno = raise_privileges();
2113
if(ret_errno != 0){
2114
errno = ret_errno;
2523
2115
perror_plus("Failed to raise privileges");
2524
2116
} else {
2525
2117
struct stat st;
2541
2133
}
2542
2134
}
2543
2135
}
2544
close(seckey_fd);
2136
TEMP_FAILURE_RETRY(close(seckey_fd));
2545
2137
}
2546
2138
}
2547
2139
2548
2140
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
2141
int pubkey_fd = open(pubkey, O_RDONLY);
2550
2142
if(pubkey_fd == -1){
2562
2154
}
2563
2155
}
2564
2156
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2157
TEMP_FAILURE_RETRY(close(pubkey_fd));
2158
}
2159
}
2160
2591
2161
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2162
ret_errno = lower_privileges();
2163
if(ret_errno != 0){
2164
errno = ret_errno;
2595
2165
perror_plus("Failed to lower privileges");
2596
2166
}
2597
2167
}
2710
2280
2711
2281
/* If no interfaces were specified, make a list */
2712
2282
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2283
struct dirent **direntries;
2714
2284
/* Look for any good interfaces */
2715
2285
ret = scandir(sys_class_net, &direntries, good_interface,
2716
2286
alphasort);
2722
2292
if(ret_errno != 0){
2723
2293
errno = ret_errno;
2724
2294
perror_plus("argz_add");
2725
free(direntries[i]);
2726
2295
continue;
2727
2296
}
2728
2297
if(debug){
2729
2298
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
2299
direntries[i]->d_name);
2731
2300
}
2732
free(direntries[i]);
2733
2301
}
2734
2302
free(direntries);
2735
2303
} else {
2736
if(ret == 0){
2737
free(direntries);
2738
}
2304
free(direntries);
2739
2305
fprintf_plus(stderr, "Could not find a network interface\n");
2740
2306
exitcode = EXIT_FAILURE;
2741
2307
goto end;
2767
2333
errno = bring_up_interface(interface, delay);
2768
2334
if(not interface_was_up){
2769
2335
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2336
perror_plus("Failed to bring up interface");
2772
2337
} else {
2773
2338
errno = argz_add(&interfaces_to_take_down,
2774
2339
&interfaces_to_take_down_size,
2797
2362
goto end;
2798
2363
}
2799
2364
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2365
ret = init_gnutls_global(pubkey, seckey, &mc);
2801
2366
if(ret == -1){
2802
2367
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
2368
exitcode = EX_UNAVAILABLE;
2925
2490
2926
2491
/* Allocate a new server */
2927
2492
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2493
&config, NULL, NULL, &ret_errno);
2929
2494
2930
2495
/* Free the Avahi configuration data */
2931
2496
avahi_server_config_free(&config);
2934
2499
/* Check if creating the Avahi server object succeeded */
2935
2500
if(mc.server == NULL){
2936
2501
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2502
avahi_strerror(ret_errno));
2938
2503
exitcode = EX_UNAVAILABLE;
2939
2504
goto end;
2940
2505
}
2975
2540
end:
2976
2541
2977
2542
if(debug){
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2543
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2985
2544
}
2986
2545
2987
2546
/* Cleanup things */
2998
2557
2999
2558
if(gnutls_initialized){
3000
2559
gnutls_certificate_free_credentials(mc.cred);
2560
gnutls_global_deinit();
3001
2561
gnutls_dh_params_deinit(mc.dh_params);
3002
2562
}
3003
2563
3011
2571
mc.current_server->prev->next = NULL;
3012
2572
while(mc.current_server != NULL){
3013
2573
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
3022
2574
free(mc.current_server);
3023
2575
mc.current_server = next;
3024
2576
}
3026
2578
3027
2579
/* Re-raise privileges */
3028
2580
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
2581
ret_errno = raise_privileges();
2582
if(ret_errno != 0){
3032
2583
perror_plus("Failed to raise privileges");
3033
2584
} else {
3034
2585
3039
2590
/* Take down the network interfaces which were brought up */
3040
2591
{
3041
2592
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
2593
while((interface=argz_next(interfaces_to_take_down,
2594
interfaces_to_take_down_size,
2595
interface))){
2596
ret_errno = take_down_interface(interface);
2597
if(ret_errno != 0){
2598
errno = ret_errno;
3048
2599
perror_plus("Failed to take down interface");
3049
2600
}
3050
2601
}
3055
2606
}
3056
2607
}
3057
2608
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
2609
ret_errno = lower_privileges_permanently();
2610
if(ret_errno != 0){
3061
2611
perror_plus("Failed to lower privileges permanently");
3062
2612
}
3063
2613
}
3065
2615
free(interfaces_to_take_down);
3066
2616
free(interfaces_hooks);
3067
2617
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3122
2618
/* Removes the GPGME temp directory and all files inside */
3123
2619
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2620
struct dirent **direntries = NULL;
2621
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2622
if(tempdir_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
int numentries = scandir(tempdir, &direntries, notdotentries,
2626
alphasort);
2627
if(numentries > 0){
2628
for(int i = 0; i < numentries; i++){
2629
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2630
if(ret == -1){
2631
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2632
" \"%s\", 0): %s\n", tempdir,
2633
direntries[i]->d_name, strerror(errno));
2634
}
2635
}
2636
2637
/* need to clean even if 0 because man page doesn't specify */
2638
free(direntries);
2639
if(numentries == -1){
2640
perror_plus("scandir");
2641
}
2642
ret = rmdir(tempdir);
2643
if(ret == -1 and errno != ENOENT){
2644
perror_plus("rmdir");
2645
}
2646
}
2647
TEMP_FAILURE_RETRY(close(tempdir_fd));
2648
}
3125
2649
}
3126
2650
3127
2651
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0