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- Committer: Teddy Hogeborn
- Date: 2018-02-22 18:15:57 UTC
- Revision ID: teddy@recompile.se-20180222181557-yhp7z2pgx9y9nf4b
Mark fallthrough case with comment
* plugin-runner.c (main/parse_opt): Mark case ARGP_KEY_ARG as falling
through (in the case where the argument is not empty).
* plugin-runner.c (main/parse_opt): Mark case ARGP_KEY_ARG as falling
through (in the case where the argument is not empty).
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,
240
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
247
if(ret == -1){
242
248
perror_plus("clock_gettime");
243
free(new_server->ip);
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
244
257
free(new_server);
245
258
return false;
246
259
}
298
311
return false;
299
312
}
300
313
301
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
302
315
if(ret == -1){
303
316
perror_plus("close");
304
317
}
486
499
return plaintext_length;
487
500
}
488
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
489
509
__attribute__((warn_unused_result))
490
510
static const char *safer_gnutls_strerror(int value){
491
511
const char *ret = gnutls_strerror(value);
492
if(ret == NULL)
493
ret = "(unknown)";
494
return ret;
512
return safe_string(ret);
495
513
}
496
514
497
515
/* GnuTLS log function callback */
501
519
fprintf_plus(stderr, "GnuTLS: %s", string);
502
520
}
503
521
504
__attribute__((nonnull, warn_unused_result))
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
505
523
static int init_gnutls_global(const char *pubkeyfilename,
506
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
507
526
mandos_context *mc){
508
527
int ret;
528
unsigned int uret;
509
529
510
530
if(debug){
511
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
512
532
}
513
533
514
ret = gnutls_global_init();
515
if(ret != GNUTLS_E_SUCCESS){
516
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
517
safer_gnutls_strerror(ret));
518
return -1;
519
}
520
521
534
if(debug){
522
535
/* "Use a log level over 10 to enable all debugging options."
523
536
* - GnuTLS manual
531
544
if(ret != GNUTLS_E_SUCCESS){
532
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
546
safer_gnutls_strerror(ret));
534
gnutls_global_deinit();
535
547
return -1;
536
548
}
537
549
562
574
safer_gnutls_strerror(ret));
563
575
goto globalfail;
564
576
}
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
566
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
569
goto globalfail;
570
}
571
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
}
572
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
573
755
574
756
return 0;
576
758
globalfail:
577
759
578
760
gnutls_certificate_free_credentials(mc->cred);
579
gnutls_global_deinit();
580
761
gnutls_dh_params_deinit(mc->dh_params);
581
762
return -1;
582
763
}
634
815
/* ignore client certificate if any. */
635
816
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
636
817
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
638
639
818
return 0;
640
819
}
641
820
643
822
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
644
823
__attribute__((unused)) const char *txt){}
645
824
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
646
1043
/* Called when a Mandos server is found */
647
1044
__attribute__((nonnull, warn_unused_result))
648
1045
static int start_mandos_communication(const char *ip, in_port_t port,
659
1056
int retval = -1;
660
1057
gnutls_session_t session;
661
1058
int pf; /* Protocol family */
1059
bool route_added = false;
662
1060
663
1061
errno = 0;
664
1062
686
1084
bool match = false;
687
1085
{
688
1086
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
691
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
692
1091
match = true;
693
1092
break;
722
1121
PRIuMAX "\n", ip, (uintmax_t)port);
723
1122
}
724
1123
725
tcp_sd = socket(pf, SOCK_STREAM, 0);
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
726
1125
if(tcp_sd < 0){
727
1126
int e = errno;
728
1127
perror_plus("socket");
735
1134
goto mandos_end;
736
1135
}
737
1136
738
memset(&to, 0, sizeof(to));
739
1137
if(af == AF_INET6){
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
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);
742
1141
} else { /* IPv4 */
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
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);
745
1145
}
746
1146
if(ret < 0 ){
747
1147
int e = errno;
817
1217
goto mandos_end;
818
1218
}
819
1219
820
if(af == AF_INET6){
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
823
} else {
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
826
}
827
if(ret < 0){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
int e = errno;
830
perror_plus("connect");
831
errno = e;
832
}
833
goto mandos_end;
834
}
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
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;
839
1275
}
840
1276
841
1277
const char *out = mandos_protocol_version;
995
1431
&decrypted_buffer, mc);
996
1432
if(decrypted_buffer_size >= 0){
997
1433
1434
clearerr(stdout);
998
1435
written = 0;
999
1436
while(written < (size_t) decrypted_buffer_size){
1000
1437
if(quit_now){
1016
1453
}
1017
1454
written += (size_t)ret;
1018
1455
}
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
}
1019
1466
retval = 0;
1020
1467
}
1021
1468
}
1024
1471
1025
1472
mandos_end:
1026
1473
{
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
}
1027
1480
int e = errno;
1028
1481
free(decrypted_buffer);
1029
1482
free(buffer);
1030
1483
if(tcp_sd >= 0){
1031
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1484
ret = close(tcp_sd);
1032
1485
}
1033
1486
if(ret == -1){
1034
1487
if(e == 0){
1046
1499
return retval;
1047
1500
}
1048
1501
1049
__attribute__((nonnull))
1050
1502
static void resolve_callback(AvahiSServiceResolver *r,
1051
1503
AvahiIfIndex interface,
1052
1504
AvahiProtocol proto,
1069
1521
timed out */
1070
1522
1071
1523
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1072
1525
return;
1073
1526
}
1074
1527
1188
1641
__attribute__((nonnull, warn_unused_result))
1189
1642
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
1643
int ret;
1191
error_t ret_errno;
1644
int old_errno;
1192
1645
1193
1646
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
1647
if(s < 0){
1195
ret_errno = errno;
1648
old_errno = errno;
1196
1649
perror_plus("socket");
1197
errno = ret_errno;
1650
errno = old_errno;
1198
1651
return false;
1199
1652
}
1200
strcpy(ifr->ifr_name, ifname);
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1201
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
1656
if(ret == -1){
1203
1657
if(debug){
1204
ret_errno = errno;
1658
old_errno = errno;
1205
1659
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1207
1666
}
1208
1667
return false;
1209
1668
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1210
1674
return true;
1211
1675
}
1212
1676
1454
1918
}
1455
1919
}
1456
1920
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
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
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
1921
__attribute__((nonnull))
1510
1922
void run_network_hooks(const char *mode, const char *interface,
1511
1923
const float delay){
1512
1924
struct dirent **direntries = NULL;
1513
1925
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1515
1928
if(hookdir_fd == -1){
1516
1929
if(errno == ENOENT){
1517
1930
if(debug){
1524
1937
return;
1525
1938
}
1526
1939
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
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
}
1529
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
1946
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1539
1947
if(numhooks == -1){
1540
1948
perror_plus("scandir");
1949
close(devnull);
1541
1950
return;
1542
1951
}
1543
1952
struct dirent *direntry;
1544
1953
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
1954
for(int i = 0; i < numhooks; i++){
1547
1955
direntry = direntries[i];
1548
1956
if(debug){
1572
1980
perror_plus("setgroups");
1573
1981
_exit(EX_NOPERM);
1574
1982
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
1984
if(ret == -1){
1592
1985
perror_plus("setenv");
1627
2020
_exit(EX_OSERR);
1628
2021
}
1629
2022
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
1631
2026
if(hook_fd == -1){
1632
2027
perror_plus("openat");
1633
2028
_exit(EXIT_FAILURE);
1634
2029
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2030
if(close(hookdir_fd) == -1){
1636
2031
perror_plus("close");
1637
2032
_exit(EXIT_FAILURE);
1638
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
}
1639
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
2050
environ) == -1){
1641
2051
perror_plus("fexecve");
1642
2052
_exit(EXIT_FAILURE);
1643
2053
}
1644
2054
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
1645
2060
int status;
1646
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
2062
perror_plus("waitpid");
2063
free(direntry);
1648
2064
continue;
1649
2065
}
1650
2066
if(WIFEXITED(status)){
1652
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
2069
" with status %d\n", direntry->d_name,
1654
2070
WEXITSTATUS(status));
2071
free(direntry);
1655
2072
continue;
1656
2073
}
1657
2074
} else if(WIFSIGNALED(status)){
1658
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
2076
" signal %d\n", direntry->d_name,
1660
2077
WTERMSIG(status));
2078
free(direntry);
1661
2079
continue;
1662
2080
} else {
1663
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
2082
" crashed\n", direntry->d_name);
2083
free(direntry);
1665
2084
continue;
1666
2085
}
1667
2086
}
1669
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
2089
direntry->d_name);
1671
2090
}
2091
free(direntry);
1672
2092
}
1673
2093
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2094
if(close(hookdir_fd) == -1){
1675
2095
perror_plus("close");
1676
2096
} else {
1677
2097
hookdir_fd = -1;
1680
2100
}
1681
2101
1682
2102
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
1686
2106
int ret;
1687
2107
struct ifreq network;
1688
2108
unsigned int if_index = if_nametoindex(interface);
1698
2118
}
1699
2119
1700
2120
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
1702
2123
if(not get_flags(interface, &network)){
1703
2124
ret_errno = errno;
1704
2125
fprintf_plus(stderr, "Failed to get flags for interface "
1717
2138
}
1718
2139
1719
2140
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2141
ret = close(sd);
1721
2142
if(ret == -1){
1722
2143
perror_plus("close");
1723
2144
}
1773
2194
}
1774
2195
1775
2196
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2197
ret = close(sd);
1777
2198
if(ret == -1){
1778
2199
perror_plus("close");
1779
2200
}
1791
2212
1792
2213
/* Sleep checking until interface is running.
1793
2214
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
2215
for(int i = 0; i < delay * 4; i++){
1795
2216
if(interface_is_running(interface)){
1796
2217
break;
1797
2218
}
1807
2228
}
1808
2229
1809
2230
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
1812
2233
struct ifreq network;
1813
2234
unsigned int if_index = if_nametoindex(interface);
1814
2235
if(if_index == 0){
1817
2238
return ENXIO;
1818
2239
}
1819
2240
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
1821
2243
if(not get_flags(interface, &network) and debug){
1822
2244
ret_errno = errno;
1823
2245
fprintf_plus(stderr, "Failed to get flags for interface "
1861
2283
}
1862
2284
1863
2285
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
int ret = close(sd);
1865
2287
if(ret == -1){
1866
2288
perror_plus("close");
1867
2289
}
1882
2304
}
1883
2305
1884
2306
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
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 };
1889
2312
AvahiSServiceBrowser *sb = NULL;
1890
2313
error_t ret_errno;
1891
2314
int ret;
1900
2323
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
2324
const char *seckey = PATHDIR "/" SECKEY;
1902
2325
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
1903
2327
char *interfaces_hooks = NULL;
1904
2328
1905
2329
bool gnutls_initialized = false;
1958
2382
.doc = "Bit length of the prime number used in the"
1959
2383
" Diffie-Hellman key exchange",
1960
2384
.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 },
1961
2390
{ .name = "priority", .key = 130,
1962
2391
.arg = "STRING",
1963
2392
.doc = "GnuTLS priority string for the TLS handshake",
2018
2447
}
2019
2448
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2020
2449
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2021
2453
case 130: /* --priority */
2022
2454
mc.priority = arg;
2023
2455
break;
2063
2495
.args_doc = "",
2064
2496
.doc = "Mandos client -- Get and decrypt"
2065
2497
" passwords from a Mandos server" };
2066
ret = argp_parse(&argp, argc, argv,
2067
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2068
switch(ret){
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2069
2501
case 0:
2070
2502
break;
2071
2503
case ENOMEM:
2072
2504
default:
2073
errno = ret;
2505
errno = ret_errno;
2074
2506
perror_plus("argp_parse");
2075
2507
exitcode = EX_OSERR;
2076
2508
goto end;
2079
2511
goto end;
2080
2512
}
2081
2513
}
2082
2514
2083
2515
{
2084
2516
/* Work around Debian bug #633582:
2085
<http://bugs.debian.org/633582> */
2517
<https://bugs.debian.org/633582> */
2086
2518
2087
2519
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2091
2523
perror_plus("Failed to raise privileges");
2092
2524
} else {
2093
2525
struct stat st;
2109
2541
}
2110
2542
}
2111
2543
}
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2544
close(seckey_fd);
2113
2545
}
2114
2546
}
2115
2547
2116
2548
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
2549
int pubkey_fd = open(pubkey, O_RDONLY);
2118
2550
if(pubkey_fd == -1){
2130
2562
}
2131
2563
}
2132
2564
}
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
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
2137
2591
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2141
2595
perror_plus("Failed to lower privileges");
2142
2596
}
2143
2597
}
2268
2722
if(ret_errno != 0){
2269
2723
errno = ret_errno;
2270
2724
perror_plus("argz_add");
2725
free(direntries[i]);
2271
2726
continue;
2272
2727
}
2273
2728
if(debug){
2274
2729
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
2730
direntries[i]->d_name);
2276
2731
}
2732
free(direntries[i]);
2277
2733
}
2278
2734
free(direntries);
2279
2735
} else {
2311
2767
errno = bring_up_interface(interface, delay);
2312
2768
if(not interface_was_up){
2313
2769
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2315
2772
} else {
2316
2773
errno = argz_add(&interfaces_to_take_down,
2317
2774
&interfaces_to_take_down_size,
2340
2797
goto end;
2341
2798
}
2342
2799
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2344
2801
if(ret == -1){
2345
2802
fprintf_plus(stderr, "init_gnutls_global failed\n");
2346
2803
exitcode = EX_UNAVAILABLE;
2468
2925
2469
2926
/* Allocate a new server */
2470
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
2928
&config, NULL, NULL, &ret);
2472
2929
2473
2930
/* Free the Avahi configuration data */
2474
2931
avahi_server_config_free(&config);
2477
2934
/* Check if creating the Avahi server object succeeded */
2478
2935
if(mc.server == NULL){
2479
2936
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
2937
avahi_strerror(ret));
2481
2938
exitcode = EX_UNAVAILABLE;
2482
2939
goto end;
2483
2940
}
2518
2975
end:
2519
2976
2520
2977
if(debug){
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
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
}
2522
2985
}
2523
2986
2524
2987
/* Cleanup things */
2535
2998
2536
2999
if(gnutls_initialized){
2537
3000
gnutls_certificate_free_credentials(mc.cred);
2538
gnutls_global_deinit();
2539
3001
gnutls_dh_params_deinit(mc.dh_params);
2540
3002
}
2541
3003
2549
3011
mc.current_server->prev->next = NULL;
2550
3012
while(mc.current_server != NULL){
2551
3013
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
2552
3022
free(mc.current_server);
2553
3023
mc.current_server = next;
2554
3024
}
2556
3026
2557
3027
/* Re-raise privileges */
2558
3028
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
2562
3032
perror_plus("Failed to raise privileges");
2563
3033
} else {
2564
3034
2569
3039
/* Take down the network interfaces which were brought up */
2570
3040
{
2571
3041
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
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;
2578
3048
perror_plus("Failed to take down interface");
2579
3049
}
2580
3050
}
2585
3055
}
2586
3056
}
2587
3057
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
2591
3061
perror_plus("Failed to lower privileges permanently");
2592
3062
}
2593
3063
}
2595
3065
free(interfaces_to_take_down);
2596
3066
free(interfaces_hooks);
2597
3067
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
2598
3122
/* Removes the GPGME temp directory and all files inside */
2599
3123
if(tempdir != NULL){
2600
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2637
}
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2639
}
3124
clean_dir_at(-1, tempdir, 0);
2640
3125
}
2641
3126
2642
3127
if(quit_now){
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