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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:59:20 UTC
- Revision ID: teddy@recompile.se-20140607215920-r4qkj7ktnjyqmrn5
Make mandos-client use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect(),
59
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open() */
61
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
62
*/
63
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
64
strtoimax() */
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
70
66
program_invocation_short_name */
71
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
77
73
*/
78
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
79
75
getuid(), getgid(), seteuid(),
80
setgid(), pause(), _exit(),
81
unlinkat() */
76
setgid(), pause(), _exit() */
82
77
#include <arpa/inet.h> /* inet_pton(), htons() */
83
78
#include <iso646.h> /* not, or, and */
84
79
#include <argp.h> /* struct argp_option, error_t, struct
238
233
.af = af };
239
234
if(new_server->ip == NULL){
240
235
perror_plus("strdup");
241
free(new_server);
242
236
return false;
243
237
}
244
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
239
if(ret == -1){
246
240
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
256
241
return false;
257
242
}
258
243
/* Special case of first server */
309
294
return false;
310
295
}
311
296
312
ret = close(fd);
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
298
if(ret == -1){
314
299
perror_plus("close");
315
300
}
497
482
return plaintext_length;
498
483
}
499
484
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
485
__attribute__((warn_unused_result))
508
486
static const char *safer_gnutls_strerror(int value){
509
487
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
488
if(ret == NULL)
489
ret = "(unknown)";
490
return ret;
511
491
}
512
492
513
493
/* GnuTLS log function callback */
517
497
fprintf_plus(stderr, "GnuTLS: %s", string);
518
498
}
519
499
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
__attribute__((nonnull, warn_unused_result))
521
501
static int init_gnutls_global(const char *pubkeyfilename,
522
502
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
503
mandos_context *mc){
525
504
int ret;
526
unsigned int uret;
527
505
528
506
if(debug){
529
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
530
508
}
531
509
510
ret = gnutls_global_init();
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
514
return -1;
515
}
516
532
517
if(debug){
533
518
/* "Use a log level over 10 to enable all debugging options."
534
519
* - GnuTLS manual
542
527
if(ret != GNUTLS_E_SUCCESS){
543
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
545
531
return -1;
546
532
}
547
533
572
558
safer_gnutls_strerror(ret));
573
559
goto globalfail;
574
560
}
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
565
goto globalfail;
566
}
567
747
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
748
569
749
570
return 0;
751
572
globalfail:
752
573
753
574
gnutls_certificate_free_credentials(mc->cred);
575
gnutls_global_deinit();
754
576
gnutls_dh_params_deinit(mc->dh_params);
755
577
return -1;
756
578
}
808
630
/* ignore client certificate if any. */
809
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
810
632
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
634
811
635
return 0;
812
636
}
813
637
815
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
640
__attribute__((unused)) const char *txt){}
817
641
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
1036
642
/* Called when a Mandos server is found */
1037
643
__attribute__((nonnull, warn_unused_result))
1038
644
static int start_mandos_communication(const char *ip, in_port_t port,
1049
655
int retval = -1;
1050
656
gnutls_session_t session;
1051
657
int pf; /* Protocol family */
1052
bool route_added = false;
1053
658
1054
659
errno = 0;
1055
660
1113
718
PRIuMAX "\n", ip, (uintmax_t)port);
1114
719
}
1115
720
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
722
if(tcp_sd < 0){
1118
723
int e = errno;
1119
724
perror_plus("socket");
1126
731
goto mandos_end;
1127
732
}
1128
733
734
memset(&to, 0, sizeof(to));
1129
735
if(af == AF_INET6){
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1133
738
} else { /* IPv4 */
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1137
741
}
1138
742
if(ret < 0 ){
1139
743
int e = errno;
1209
813
goto mandos_end;
1210
814
}
1211
815
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
1267
835
}
1268
836
1269
837
const char *out = mandos_protocol_version;
1452
1020
1453
1021
mandos_end:
1454
1022
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
1461
1023
int e = errno;
1462
1024
free(decrypted_buffer);
1463
1025
free(buffer);
1464
1026
if(tcp_sd >= 0){
1465
ret = close(tcp_sd);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1466
1028
}
1467
1029
if(ret == -1){
1468
1030
if(e == 0){
1503
1065
timed out */
1504
1066
1505
1067
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1507
1068
return;
1508
1069
}
1509
1070
1623
1184
__attribute__((nonnull, warn_unused_result))
1624
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1625
1186
int ret;
1626
int old_errno;
1187
error_t ret_errno;
1627
1188
1628
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1629
1190
if(s < 0){
1630
old_errno = errno;
1191
ret_errno = errno;
1631
1192
perror_plus("socket");
1632
errno = old_errno;
1193
errno = ret_errno;
1633
1194
return false;
1634
1195
}
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
strcpy(ifr->ifr_name, ifname);
1637
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1638
1198
if(ret == -1){
1639
1199
if(debug){
1640
old_errno = errno;
1200
ret_errno = errno;
1641
1201
perror_plus("ioctl SIOCGIFFLAGS");
1642
errno = old_errno;
1202
errno = ret_errno;
1643
1203
}
1644
1204
return false;
1645
1205
}
1786
1346
return 0;
1787
1347
}
1788
1348
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1790
1357
if(ret == -1){
1791
1358
if(debug){
1792
1359
perror_plus("Could not stat hook");
1793
1360
}
1794
1361
return 0;
1795
1362
}
1363
free(fullname);
1796
1364
if(not (S_ISREG(st.st_mode))){
1797
1365
/* Not a regular file */
1798
1366
if(debug){
1890
1458
}
1891
1459
}
1892
1460
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
1893
1536
__attribute__((nonnull))
1894
1537
void run_network_hooks(const char *mode, const char *interface,
1895
1538
const float delay){
1896
struct dirent **direntries = NULL;
1539
struct dirent **direntries;
1897
1540
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
1900
1548
if(hookdir_fd == -1){
1901
1549
if(errno == ENOENT){
1902
1550
if(debug){
1908
1556
}
1909
1557
return;
1910
1558
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1911
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
1912
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
1914
1583
if(numhooks == -1){
1915
1584
perror_plus("scandir");
1916
1585
return;
1917
1586
}
1918
1587
struct dirent *direntry;
1919
1588
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1589
int devnull = open("/dev/null", O_RDONLY);
1925
1590
for(int i = 0; i < numhooks; i++){
1926
1591
direntry = direntries[i];
1927
1592
if(debug){
1932
1597
if(hook_pid == 0){
1933
1598
/* Child */
1934
1599
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1600
if(raise_privileges_permanently() != 0){
1937
1601
perror_plus("Failed to raise privileges");
1938
1602
_exit(EX_NOPERM);
1939
1603
}
1951
1615
perror_plus("setgroups");
1952
1616
_exit(EX_NOPERM);
1953
1617
}
1618
ret = dup2(devnull, STDIN_FILENO);
1619
if(ret == -1){
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1621
_exit(EX_OSERR);
1622
}
1623
ret = close(devnull);
1624
if(ret == -1){
1625
perror_plus("close");
1626
_exit(EX_OSERR);
1627
}
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1629
if(ret == -1){
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1631
_exit(EX_OSERR);
1632
}
1954
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
1634
if(ret == -1){
1956
1635
perror_plus("setenv");
1991
1670
_exit(EX_OSERR);
1992
1671
}
1993
1672
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
2022
1675
perror_plus("fexecve");
2023
1676
_exit(EXIT_FAILURE);
2024
1677
}
2025
1678
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
1679
int status;
2032
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
1681
perror_plus("waitpid");
2034
free(direntry);
2035
1682
continue;
2036
1683
}
2037
1684
if(WIFEXITED(status)){
2039
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
1687
" with status %d\n", direntry->d_name,
2041
1688
WEXITSTATUS(status));
2042
free(direntry);
2043
1689
continue;
2044
1690
}
2045
1691
} else if(WIFSIGNALED(status)){
2046
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
1693
" signal %d\n", direntry->d_name,
2048
1694
WTERMSIG(status));
2049
free(direntry);
2050
1695
continue;
2051
1696
} else {
2052
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
1698
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
1699
continue;
2056
1700
}
2057
1701
}
2059
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
1704
direntry->d_name);
2061
1705
}
2062
free(direntry);
2063
1706
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2066
1708
perror_plus("close");
2067
1709
} else {
2068
1710
hookdir_fd = -1;
2071
1713
}
2072
1714
2073
1715
__attribute__((nonnull, warn_unused_result))
2074
int bring_up_interface(const char *const interface,
2075
const float delay){
2076
int old_errno = errno;
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
2077
1719
int ret;
2078
1720
struct ifreq network;
2079
1721
unsigned int if_index = if_nametoindex(interface);
2089
1731
}
2090
1732
2091
1733
if(not interface_is_up(interface)){
2092
int ret_errno = 0;
2093
int ioctl_errno = 0;
1734
error_t ret_errno = 0, ioctl_errno = 0;
2094
1735
if(not get_flags(interface, &network)){
2095
1736
ret_errno = errno;
2096
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2109
1750
}
2110
1751
2111
1752
if(quit_now){
2112
ret = close(sd);
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2113
1754
if(ret == -1){
2114
1755
perror_plus("close");
2115
1756
}
2125
1766
/* Raise privileges */
2126
1767
ret_errno = raise_privileges();
2127
1768
if(ret_errno != 0){
2128
errno = ret_errno;
2129
1769
perror_plus("Failed to raise privileges");
2130
1770
}
2131
1771
2165
1805
}
2166
1806
2167
1807
/* Close the socket */
2168
ret = close(sd);
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2169
1809
if(ret == -1){
2170
1810
perror_plus("close");
2171
1811
}
2199
1839
}
2200
1840
2201
1841
__attribute__((nonnull, warn_unused_result))
2202
int take_down_interface(const char *const interface){
2203
int old_errno = errno;
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
2204
1844
struct ifreq network;
2205
1845
unsigned int if_index = if_nametoindex(interface);
2206
1846
if(if_index == 0){
2209
1849
return ENXIO;
2210
1850
}
2211
1851
if(interface_is_up(interface)){
2212
int ret_errno = 0;
2213
int ioctl_errno = 0;
1852
error_t ret_errno = 0, ioctl_errno = 0;
2214
1853
if(not get_flags(interface, &network) and debug){
2215
1854
ret_errno = errno;
2216
1855
fprintf_plus(stderr, "Failed to get flags for interface "
2236
1875
/* Raise privileges */
2237
1876
ret_errno = raise_privileges();
2238
1877
if(ret_errno != 0){
2239
errno = ret_errno;
2240
1878
perror_plus("Failed to raise privileges");
2241
1879
}
2242
1880
2254
1892
}
2255
1893
2256
1894
/* Close the socket */
2257
int ret = close(sd);
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2258
1896
if(ret == -1){
2259
1897
perror_plus("close");
2260
1898
}
2275
1913
}
2276
1914
2277
1915
int main(int argc, char *argv[]){
2278
mandos_context mc = { .server = NULL, .dh_bits = 0,
2279
.priority = "SECURE256:!CTYPE-X.509"
2280
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2281
.current_server = NULL, .interfaces = NULL,
2282
.interfaces_size = 0 };
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
2283
1920
AvahiSServiceBrowser *sb = NULL;
2284
1921
error_t ret_errno;
2285
1922
int ret;
2294
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2295
1932
const char *seckey = PATHDIR "/" SECKEY;
2296
1933
const char *pubkey = PATHDIR "/" PUBKEY;
2297
const char *dh_params_file = NULL;
2298
1934
char *interfaces_hooks = NULL;
2299
1935
2300
1936
bool gnutls_initialized = false;
2353
1989
.doc = "Bit length of the prime number used in the"
2354
1990
" Diffie-Hellman key exchange",
2355
1991
.group = 2 },
2356
{ .name = "dh-params", .key = 134,
2357
.arg = "FILE",
2358
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2359
" for the Diffie-Hellman key exchange",
2360
.group = 2 },
2361
1992
{ .name = "priority", .key = 130,
2362
1993
.arg = "STRING",
2363
1994
.doc = "GnuTLS priority string for the TLS handshake",
2418
2049
}
2419
2050
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2420
2051
break;
2421
case 134: /* --dh-params */
2422
dh_params_file = arg;
2423
break;
2424
2052
case 130: /* --priority */
2425
2053
mc.priority = arg;
2426
2054
break;
2466
2094
.args_doc = "",
2467
2095
.doc = "Mandos client -- Get and decrypt"
2468
2096
" passwords from a Mandos server" };
2469
ret_errno = argp_parse(&argp, argc, argv,
2470
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2471
switch(ret_errno){
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2099
switch(ret){
2472
2100
case 0:
2473
2101
break;
2474
2102
case ENOMEM:
2475
2103
default:
2476
errno = ret_errno;
2104
errno = ret;
2477
2105
perror_plus("argp_parse");
2478
2106
exitcode = EX_OSERR;
2479
2107
goto end;
2482
2110
goto end;
2483
2111
}
2484
2112
}
2485
2113
2486
2114
{
2487
2115
/* Work around Debian bug #633582:
2488
2116
<http://bugs.debian.org/633582> */
2489
2117
2490
2118
/* Re-raise privileges */
2491
ret = raise_privileges();
2492
if(ret != 0){
2493
errno = ret;
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2494
2122
perror_plus("Failed to raise privileges");
2495
2123
} else {
2496
2124
struct stat st;
2512
2140
}
2513
2141
}
2514
2142
}
2515
close(seckey_fd);
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2516
2144
}
2517
2145
}
2518
2146
2519
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2520
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2521
2149
if(pubkey_fd == -1){
2533
2161
}
2534
2162
}
2535
2163
}
2536
close(pubkey_fd);
2537
}
2538
}
2539
2540
if(dh_params_file != NULL
2541
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2542
int dhparams_fd = open(dh_params_file, O_RDONLY);
2543
if(dhparams_fd == -1){
2544
perror_plus("open");
2545
} else {
2546
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2547
if(ret == -1){
2548
perror_plus("fstat");
2549
} else {
2550
if(S_ISREG(st.st_mode)
2551
and st.st_uid == 0 and st.st_gid == 0){
2552
ret = fchown(dhparams_fd, uid, gid);
2553
if(ret == -1){
2554
perror_plus("fchown");
2555
}
2556
}
2557
}
2558
close(dhparams_fd);
2559
}
2560
}
2561
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2562
2168
/* Lower privileges */
2563
ret = lower_privileges();
2564
if(ret != 0){
2565
errno = ret;
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2566
2172
perror_plus("Failed to lower privileges");
2567
2173
}
2568
2174
}
2681
2287
2682
2288
/* If no interfaces were specified, make a list */
2683
2289
if(mc.interfaces == NULL){
2684
struct dirent **direntries = NULL;
2290
struct dirent **direntries;
2685
2291
/* Look for any good interfaces */
2686
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2687
2293
alphasort);
2693
2299
if(ret_errno != 0){
2694
2300
errno = ret_errno;
2695
2301
perror_plus("argz_add");
2696
free(direntries[i]);
2697
2302
continue;
2698
2303
}
2699
2304
if(debug){
2700
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2701
2306
direntries[i]->d_name);
2702
2307
}
2703
free(direntries[i]);
2704
2308
}
2705
2309
free(direntries);
2706
2310
} else {
2707
if(ret == 0){
2708
free(direntries);
2709
}
2311
free(direntries);
2710
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2711
2313
exitcode = EXIT_FAILURE;
2712
2314
goto end;
2738
2340
errno = bring_up_interface(interface, delay);
2739
2341
if(not interface_was_up){
2740
2342
if(errno != 0){
2741
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2742
" %s\n", interface, strerror(errno));
2343
perror_plus("Failed to bring up interface");
2743
2344
} else {
2744
2345
errno = argz_add(&interfaces_to_take_down,
2745
2346
&interfaces_to_take_down_size,
2768
2369
goto end;
2769
2370
}
2770
2371
2771
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
2772
2373
if(ret == -1){
2773
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
2774
2375
exitcode = EX_UNAVAILABLE;
2896
2497
2897
2498
/* Allocate a new server */
2898
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2899
&config, NULL, NULL, &ret);
2500
&config, NULL, NULL, &ret_errno);
2900
2501
2901
2502
/* Free the Avahi configuration data */
2902
2503
avahi_server_config_free(&config);
2905
2506
/* Check if creating the Avahi server object succeeded */
2906
2507
if(mc.server == NULL){
2907
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2908
avahi_strerror(ret));
2509
avahi_strerror(ret_errno));
2909
2510
exitcode = EX_UNAVAILABLE;
2910
2511
goto end;
2911
2512
}
2963
2564
2964
2565
if(gnutls_initialized){
2965
2566
gnutls_certificate_free_credentials(mc.cred);
2567
gnutls_global_deinit();
2966
2568
gnutls_dh_params_deinit(mc.dh_params);
2967
2569
}
2968
2570
2976
2578
mc.current_server->prev->next = NULL;
2977
2579
while(mc.current_server != NULL){
2978
2580
server *next = mc.current_server->next;
2979
#ifdef __GNUC__
2980
#pragma GCC diagnostic push
2981
#pragma GCC diagnostic ignored "-Wcast-qual"
2982
#endif
2983
free((char *)(mc.current_server->ip));
2984
#ifdef __GNUC__
2985
#pragma GCC diagnostic pop
2986
#endif
2987
2581
free(mc.current_server);
2988
2582
mc.current_server = next;
2989
2583
}
2991
2585
2992
2586
/* Re-raise privileges */
2993
2587
{
2994
ret = raise_privileges();
2995
if(ret != 0){
2996
errno = ret;
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
2997
2590
perror_plus("Failed to raise privileges");
2998
2591
} else {
2999
2592
3007
2600
while((interface=argz_next(interfaces_to_take_down,
3008
2601
interfaces_to_take_down_size,
3009
2602
interface))){
3010
ret = take_down_interface(interface);
3011
if(ret != 0){
3012
errno = ret;
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
3013
2606
perror_plus("Failed to take down interface");
3014
2607
}
3015
2608
}
3020
2613
}
3021
2614
}
3022
2615
3023
ret = lower_privileges_permanently();
3024
if(ret != 0){
3025
errno = ret;
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
3026
2618
perror_plus("Failed to lower privileges permanently");
3027
2619
}
3028
2620
}
3030
2622
free(interfaces_to_take_down);
3031
2623
free(interfaces_hooks);
3032
2624
3033
void clean_dir_at(int base, const char * const dirname,
3034
uintmax_t level){
3035
struct dirent **direntries = NULL;
3036
int dret;
3037
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3038
O_RDONLY
3039
| O_NOFOLLOW
3040
| O_DIRECTORY
3041
| O_PATH));
3042
if(dir_fd == -1){
3043
perror_plus("open");
3044
}
3045
int numentries = scandirat(dir_fd, ".", &direntries,
3046
notdotentries, alphasort);
3047
if(numentries >= 0){
3048
for(int i = 0; i < numentries; i++){
3049
if(debug){
3050
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3051
dirname, direntries[i]->d_name);
3052
}
3053
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3054
if(dret == -1){
3055
if(errno == EISDIR){
3056
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
AT_REMOVEDIR);
3058
}
3059
if((dret == -1) and (errno == ENOTEMPTY)
3060
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3061
== 0) and (level == 0)){
3062
/* Recurse only in this special case */
3063
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
dret = 0;
3065
}
3066
if(dret == -1){
3067
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
direntries[i]->d_name, strerror(errno));
3069
}
3070
}
3071
free(direntries[i]);
3072
}
3073
3074
/* need to clean even if 0 because man page doesn't specify */
3075
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
if(dret == -1 and errno != ENOENT){
3081
perror_plus("rmdir");
3082
}
3083
} else {
3084
perror_plus("scandirat");
3085
}
3086
close(dir_fd);
3087
}
3088
3089
2625
/* Removes the GPGME temp directory and all files inside */
3090
2626
if(tempdir != NULL){
3091
clean_dir_at(-1, tempdir, 0);
2627
struct dirent **direntries = NULL;
2628
struct dirent *direntry = NULL;
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2630
alphasort);
2631
if(numentries > 0){
2632
for(int i = 0; i < numentries; i++){
2633
direntry = direntries[i];
2634
char *fullname = NULL;
2635
ret = asprintf(&fullname, "%s/%s", tempdir,
2636
direntry->d_name);
2637
if(ret < 0){
2638
perror_plus("asprintf");
2639
continue;
2640
}
2641
ret = remove(fullname);
2642
if(ret == -1){
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2644
strerror(errno));
2645
}
2646
free(fullname);
2647
}
2648
}
2649
2650
/* need to clean even if 0 because man page doesn't specify */
2651
free(direntries);
2652
if(numentries == -1){
2653
perror_plus("scandir");
2654
}
2655
ret = rmdir(tempdir);
2656
if(ret == -1 and errno != ENOENT){
2657
perror_plus("rmdir");
2658
}
3092
2659
}
3093
2660
3094
2661
if(quit_now){
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