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- Committer: Teddy Hogeborn
- Date: 2014-06-22 02:19:30 UTC
- Revision ID: teddy@recompile.se-20140622021930-icl7h4cm97blhjml
mandos-keygen: Generate "checker" option to use SSH fingerprints.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
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
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
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
751
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
570
753
571
return 0;
755
573
globalfail:
756
574
757
575
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
758
577
gnutls_dh_params_deinit(mc->dh_params);
759
578
return -1;
760
579
}
812
631
/* ignore client certificate if any. */
813
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
814
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
815
636
return 0;
816
637
}
817
638
819
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
641
__attribute__((unused)) const char *txt){}
821
642
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
827
if(seteuid(0) == -1){
828
ret = errno;
829
}
830
errno = old_errno;
831
return ret;
832
}
833
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
840
errno = old_errno;
841
return ret;
842
}
843
if(setuid(0) == -1){
844
ret = errno;
845
}
846
errno = old_errno;
847
return ret;
848
}
849
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
855
if(seteuid(uid) == -1){
856
ret = errno;
857
}
858
errno = old_errno;
859
return ret;
860
}
861
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
867
if(setuid(uid) == -1){
868
ret = errno;
869
}
870
errno = old_errno;
871
return ret;
872
}
873
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
877
const char *address,
878
AvahiIfIndex if_index){
879
int ret;
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
886
if(debug){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
889
}
890
return false;
891
}
892
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
896
return false;
897
}
898
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
if(devnull == -1){
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
902
return false;
903
}
904
pid_t pid = fork();
905
if(pid == 0){
906
/* Child */
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
909
if(errno != 0){
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
912
} else {
913
/* Set group */
914
errno = 0;
915
ret = setgid(0);
916
if(ret == -1){
917
perror_plus("setgid");
918
_exit(EX_NOPERM);
919
}
920
/* Reset supplementary groups */
921
errno = 0;
922
ret = setgroups(0, NULL);
923
if(ret == -1){
924
perror_plus("setgroups");
925
_exit(EX_NOPERM);
926
}
927
}
928
ret = dup2(devnull, STDIN_FILENO);
929
if(ret == -1){
930
perror_plus("dup2(devnull, STDIN_FILENO)");
931
_exit(EX_OSERR);
932
}
933
ret = close(devnull);
934
if(ret == -1){
935
perror_plus("close");
936
_exit(EX_OSERR);
937
}
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
if(ret == -1){
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
_exit(EX_OSERR);
942
}
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
O_RDONLY
945
| O_DIRECTORY
946
| O_PATH
947
| O_CLOEXEC));
948
if(helperdir_fd == -1){
949
perror_plus("open");
950
_exit(EX_UNAVAILABLE);
951
}
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
helper, O_RDONLY));
954
if(helper_fd == -1){
955
perror_plus("openat");
956
close(helperdir_fd);
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
643
/* Called when a Mandos server is found */
1041
644
__attribute__((nonnull, warn_unused_result))
1042
645
static int start_mandos_communication(const char *ip, in_port_t port,
1053
656
int retval = -1;
1054
657
gnutls_session_t session;
1055
658
int pf; /* Protocol family */
1056
bool route_added = false;
1057
659
1058
660
errno = 0;
1059
661
1081
683
bool match = false;
1082
684
{
1083
685
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1087
688
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
689
match = true;
1089
690
break;
1118
719
PRIuMAX "\n", ip, (uintmax_t)port);
1119
720
}
1120
721
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
723
if(tcp_sd < 0){
1123
724
int e = errno;
1124
725
perror_plus("socket");
1131
732
goto mandos_end;
1132
733
}
1133
734
735
memset(&to, 0, sizeof(to));
1134
736
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
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);
1138
739
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
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);
1142
742
}
1143
743
if(ret < 0 ){
1144
744
int e = errno;
1214
814
goto mandos_end;
1215
815
}
1216
816
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
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;
1272
836
}
1273
837
1274
838
const char *out = mandos_protocol_version;
1428
992
&decrypted_buffer, mc);
1429
993
if(decrypted_buffer_size >= 0){
1430
994
1431
clearerr(stdout);
1432
995
written = 0;
1433
996
while(written < (size_t) decrypted_buffer_size){
1434
997
if(quit_now){
1450
1013
}
1451
1014
written += (size_t)ret;
1452
1015
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
1463
1016
retval = 0;
1464
1017
}
1465
1018
}
1468
1021
1469
1022
mandos_end:
1470
1023
{
1471
if(route_added){
1472
if(not delete_local_route(ip, if_index)){
1473
fprintf_plus(stderr, "Failed to delete local route to %s on"
1474
" interface %d", ip, if_index);
1475
}
1476
}
1477
1024
int e = errno;
1478
1025
free(decrypted_buffer);
1479
1026
free(buffer);
1480
1027
if(tcp_sd >= 0){
1481
ret = close(tcp_sd);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1482
1029
}
1483
1030
if(ret == -1){
1484
1031
if(e == 0){
1496
1043
return retval;
1497
1044
}
1498
1045
1046
__attribute__((nonnull))
1499
1047
static void resolve_callback(AvahiSServiceResolver *r,
1500
1048
AvahiIfIndex interface,
1501
1049
AvahiProtocol proto,
1518
1066
timed out */
1519
1067
1520
1068
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1522
1069
return;
1523
1070
}
1524
1071
1638
1185
__attribute__((nonnull, warn_unused_result))
1639
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1640
1187
int ret;
1641
int old_errno;
1188
error_t ret_errno;
1642
1189
1643
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1644
1191
if(s < 0){
1645
old_errno = errno;
1192
ret_errno = errno;
1646
1193
perror_plus("socket");
1647
errno = old_errno;
1194
errno = ret_errno;
1648
1195
return false;
1649
1196
}
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1197
strcpy(ifr->ifr_name, ifname);
1652
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1653
1199
if(ret == -1){
1654
1200
if(debug){
1655
old_errno = errno;
1201
ret_errno = errno;
1656
1202
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1203
errno = ret_errno;
1658
1204
}
1659
close(s);
1660
1205
return false;
1661
1206
}
1662
close(s);
1663
1207
return true;
1664
1208
}
1665
1209
1907
1451
}
1908
1452
}
1909
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
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1910
1506
__attribute__((nonnull))
1911
1507
void run_network_hooks(const char *mode, const char *interface,
1912
1508
const float delay){
1913
1509
struct dirent **direntries = NULL;
1914
1510
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1511
hookdir_fd = open(hookdir, O_RDONLY);
1917
1512
if(hookdir_fd == -1){
1918
1513
if(errno == ENOENT){
1919
1514
if(debug){
1926
1521
return;
1927
1522
}
1928
1523
}
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1934
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1936
1536
if(numhooks == -1){
1937
1537
perror_plus("scandir");
1938
close(devnull);
1939
1538
return;
1940
1539
}
1941
1540
struct dirent *direntry;
1942
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1943
1543
for(int i = 0; i < numhooks; i++){
1944
1544
direntry = direntries[i];
1945
1545
if(debug){
1969
1569
perror_plus("setgroups");
1970
1570
_exit(EX_NOPERM);
1971
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1972
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1973
1588
if(ret == -1){
1974
1589
perror_plus("setenv");
2009
1624
_exit(EX_OSERR);
2010
1625
}
2011
1626
}
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2015
1628
if(hook_fd == -1){
2016
1629
perror_plus("openat");
2017
1630
_exit(EXIT_FAILURE);
2018
1631
}
2019
if(close(hookdir_fd) == -1){
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2020
1633
perror_plus("close");
2021
1634
_exit(EXIT_FAILURE);
2022
1635
}
2023
ret = dup2(devnull, STDIN_FILENO);
2024
if(ret == -1){
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2026
_exit(EX_OSERR);
2027
}
2028
ret = close(devnull);
2029
if(ret == -1){
2030
perror_plus("close");
2031
_exit(EX_OSERR);
2032
}
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2034
if(ret == -1){
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2036
_exit(EX_OSERR);
2037
}
2038
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2039
1637
environ) == -1){
2040
1638
perror_plus("fexecve");
2041
1639
_exit(EXIT_FAILURE);
2042
1640
}
2043
1641
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
2049
1642
int status;
2050
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
1644
perror_plus("waitpid");
2052
free(direntry);
2053
1645
continue;
2054
1646
}
2055
1647
if(WIFEXITED(status)){
2057
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
1650
" with status %d\n", direntry->d_name,
2059
1651
WEXITSTATUS(status));
2060
free(direntry);
2061
1652
continue;
2062
1653
}
2063
1654
} else if(WIFSIGNALED(status)){
2064
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
1656
" signal %d\n", direntry->d_name,
2066
1657
WTERMSIG(status));
2067
free(direntry);
2068
1658
continue;
2069
1659
} else {
2070
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
1661
" crashed\n", direntry->d_name);
2072
free(direntry);
2073
1662
continue;
2074
1663
}
2075
1664
}
2077
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
1667
direntry->d_name);
2079
1668
}
2080
free(direntry);
2081
1669
}
2082
1670
free(direntries);
2083
if(close(hookdir_fd) == -1){
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2084
1672
perror_plus("close");
2085
1673
} else {
2086
1674
hookdir_fd = -1;
2089
1677
}
2090
1678
2091
1679
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
2095
1683
int ret;
2096
1684
struct ifreq network;
2097
1685
unsigned int if_index = if_nametoindex(interface);
2107
1695
}
2108
1696
2109
1697
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
1698
error_t ret_errno = 0, ioctl_errno = 0;
2112
1699
if(not get_flags(interface, &network)){
2113
1700
ret_errno = errno;
2114
1701
fprintf_plus(stderr, "Failed to get flags for interface "
2127
1714
}
2128
1715
2129
1716
if(quit_now){
2130
ret = close(sd);
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2131
1718
if(ret == -1){
2132
1719
perror_plus("close");
2133
1720
}
2183
1770
}
2184
1771
2185
1772
/* Close the socket */
2186
ret = close(sd);
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2187
1774
if(ret == -1){
2188
1775
perror_plus("close");
2189
1776
}
2201
1788
2202
1789
/* Sleep checking until interface is running.
2203
1790
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
1791
for(int i=0; i < delay * 4; i++){
2205
1792
if(interface_is_running(interface)){
2206
1793
break;
2207
1794
}
2217
1804
}
2218
1805
2219
1806
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
2222
1809
struct ifreq network;
2223
1810
unsigned int if_index = if_nametoindex(interface);
2224
1811
if(if_index == 0){
2227
1814
return ENXIO;
2228
1815
}
2229
1816
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
1817
error_t ret_errno = 0, ioctl_errno = 0;
2232
1818
if(not get_flags(interface, &network) and debug){
2233
1819
ret_errno = errno;
2234
1820
fprintf_plus(stderr, "Failed to get flags for interface "
2272
1858
}
2273
1859
2274
1860
/* Close the socket */
2275
int ret = close(sd);
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2276
1862
if(ret == -1){
2277
1863
perror_plus("close");
2278
1864
}
2293
1879
}
2294
1880
2295
1881
int main(int argc, char *argv[]){
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
2301
1886
AvahiSServiceBrowser *sb = NULL;
2302
1887
error_t ret_errno;
2303
1888
int ret;
2312
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2313
1898
const char *seckey = PATHDIR "/" SECKEY;
2314
1899
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
1900
char *interfaces_hooks = NULL;
2317
1901
2318
1902
bool gnutls_initialized = false;
2371
1955
.doc = "Bit length of the prime number used in the"
2372
1956
" Diffie-Hellman key exchange",
2373
1957
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
2379
1958
{ .name = "priority", .key = 130,
2380
1959
.arg = "STRING",
2381
1960
.doc = "GnuTLS priority string for the TLS handshake",
2436
2015
}
2437
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2438
2017
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
2442
2018
case 130: /* --priority */
2443
2019
mc.priority = arg;
2444
2020
break;
2484
2060
.args_doc = "",
2485
2061
.doc = "Mandos client -- Get and decrypt"
2486
2062
" passwords from a Mandos server" };
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2490
2066
case 0:
2491
2067
break;
2492
2068
case ENOMEM:
2493
2069
default:
2494
errno = ret_errno;
2070
errno = ret;
2495
2071
perror_plus("argp_parse");
2496
2072
exitcode = EX_OSERR;
2497
2073
goto end;
2500
2076
goto end;
2501
2077
}
2502
2078
}
2503
2079
2504
2080
{
2505
2081
/* Work around Debian bug #633582:
2506
<https://bugs.debian.org/633582> */
2082
<http://bugs.debian.org/633582> */
2507
2083
2508
2084
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2512
2088
perror_plus("Failed to raise privileges");
2513
2089
} else {
2514
2090
struct stat st;
2530
2106
}
2531
2107
}
2532
2108
}
2533
close(seckey_fd);
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2534
2110
}
2535
2111
}
2536
2112
2537
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2538
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2539
2115
if(pubkey_fd == -1){
2551
2127
}
2552
2128
}
2553
2129
}
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2577
}
2578
}
2579
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2580
2134
/* Lower privileges */
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2584
2138
perror_plus("Failed to lower privileges");
2585
2139
}
2586
2140
}
2711
2265
if(ret_errno != 0){
2712
2266
errno = ret_errno;
2713
2267
perror_plus("argz_add");
2714
free(direntries[i]);
2715
2268
continue;
2716
2269
}
2717
2270
if(debug){
2718
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
2272
direntries[i]->d_name);
2720
2273
}
2721
free(direntries[i]);
2722
2274
}
2723
2275
free(direntries);
2724
2276
} else {
2756
2308
errno = bring_up_interface(interface, delay);
2757
2309
if(not interface_was_up){
2758
2310
if(errno != 0){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2311
perror_plus("Failed to bring up interface");
2761
2312
} else {
2762
2313
errno = argz_add(&interfaces_to_take_down,
2763
2314
&interfaces_to_take_down_size,
2786
2337
goto end;
2787
2338
}
2788
2339
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2790
2341
if(ret == -1){
2791
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2792
2343
exitcode = EX_UNAVAILABLE;
2914
2465
2915
2466
/* Allocate a new server */
2916
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2468
&config, NULL, NULL, &ret_errno);
2918
2469
2919
2470
/* Free the Avahi configuration data */
2920
2471
avahi_server_config_free(&config);
2923
2474
/* Check if creating the Avahi server object succeeded */
2924
2475
if(mc.server == NULL){
2925
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2477
avahi_strerror(ret_errno));
2927
2478
exitcode = EX_UNAVAILABLE;
2928
2479
goto end;
2929
2480
}
2964
2515
end:
2965
2516
2966
2517
if(debug){
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2974
2519
}
2975
2520
2976
2521
/* Cleanup things */
2987
2532
2988
2533
if(gnutls_initialized){
2989
2534
gnutls_certificate_free_credentials(mc.cred);
2535
gnutls_global_deinit();
2990
2536
gnutls_dh_params_deinit(mc.dh_params);
2991
2537
}
2992
2538
3000
2546
mc.current_server->prev->next = NULL;
3001
2547
while(mc.current_server != NULL){
3002
2548
server *next = mc.current_server->next;
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3006
#endif
3007
free((char *)(mc.current_server->ip));
3008
#ifdef __GNUC__
3009
#pragma GCC diagnostic pop
3010
#endif
3011
2549
free(mc.current_server);
3012
2550
mc.current_server = next;
3013
2551
}
3015
2553
3016
2554
/* Re-raise privileges */
3017
2555
{
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
3021
2559
perror_plus("Failed to raise privileges");
3022
2560
} else {
3023
2561
3028
2566
/* Take down the network interfaces which were brought up */
3029
2567
{
3030
2568
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
3037
2575
perror_plus("Failed to take down interface");
3038
2576
}
3039
2577
}
3044
2582
}
3045
2583
}
3046
2584
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
3050
2588
perror_plus("Failed to lower privileges permanently");
3051
2589
}
3052
2590
}
3054
2592
free(interfaces_to_take_down);
3055
2593
free(interfaces_hooks);
3056
2594
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
3059
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
3109
}
3110
3111
2595
/* Removes the GPGME temp directory and all files inside */
3112
2596
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
2597
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2634
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2636
}
3114
2637
}
3115
2638
3116
2639
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0