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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:34:36 UTC
- Revision ID: teddy@recompile.se-20140310063436-zksdghqvv6k1pbyg
Do not add a new server to server list if clock_gettime() fails
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
- files added:
- debian/upstream-signing-key.pgp
- files removed:
- bugs.xml
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
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() */
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,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
76
setgid(), pause(), _exit() */
84
77
#include <arpa/inet.h> /* inet_pton(), htons() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
148
141
static const char sys_class_net[] = "/sys/class/net";
149
142
char *connect_to = NULL;
150
143
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
144
uid_t uid = 65534;
153
145
gid_t gid = 65534;
154
146
191
183
perror(print_text);
192
184
}
193
185
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
__attribute__((format (gnu_printf, 2, 3)))
195
187
int fprintf_plus(FILE *stream, const char *format, ...){
196
188
va_list ap;
197
189
va_start (ap, format);
206
198
* bytes. "buffer_capacity" is how much is currently allocated,
207
199
* "buffer_length" is how much is already used.
208
200
*/
209
__attribute__((nonnull, warn_unused_result))
210
201
size_t incbuffer(char **buffer, size_t buffer_length,
211
202
size_t buffer_capacity){
212
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
225
216
}
226
217
227
218
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
220
int af, server **current_server){
231
221
int ret;
240
230
.af = af };
241
231
if(new_server->ip == NULL){
242
232
perror_plus("strdup");
243
free(new_server);
244
233
return false;
245
234
}
246
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
236
if(ret == -1){
248
237
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
238
return false;
259
239
}
260
240
/* Special case of first server */
262
242
new_server->next = new_server;
263
243
new_server->prev = new_server;
264
244
*current_server = new_server;
245
/* Place the new server last in the list */
265
246
} else {
266
/* Place the new server last in the list */
267
247
new_server->next = *current_server;
268
248
new_server->prev = (*current_server)->prev;
269
249
new_server->prev->next = new_server;
275
255
/*
276
256
* Initialize GPGME.
277
257
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
283
260
gpgme_error_t rc;
284
261
gpgme_engine_info_t engine_info;
285
262
286
263
/*
287
264
* Helper function to insert pub and seckey to the engine keyring.
288
265
*/
289
bool import_key(const char * const filename){
266
bool import_key(const char *filename){
290
267
int ret;
291
268
int fd;
292
269
gpgme_data_t pgp_data;
311
288
return false;
312
289
}
313
290
314
ret = close(fd);
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
292
if(ret == -1){
316
293
perror_plus("close");
317
294
}
373
350
* Decrypt OpenPGP data.
374
351
* Returns -1 on error
375
352
*/
376
__attribute__((nonnull, warn_unused_result))
377
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
354
size_t crypto_size,
379
355
char **plaintext,
499
475
return plaintext_length;
500
476
}
501
477
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
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
478
static const char * safer_gnutls_strerror(int value){
511
479
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
513
483
}
514
484
515
485
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
486
static void debuggnutls(__attribute__((unused)) int level,
518
487
const char* string){
519
488
fprintf_plus(stderr, "GnuTLS: %s", string);
520
489
}
521
490
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
491
static int init_gnutls_global(const char *pubkeyfilename,
524
492
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
493
mandos_context *mc){
527
494
int ret;
528
unsigned int uret;
529
495
530
496
if(debug){
531
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
498
}
533
499
500
ret = gnutls_global_init();
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
504
return -1;
505
}
506
534
507
if(debug){
535
508
/* "Use a log level over 10 to enable all debugging options."
536
509
* - GnuTLS manual
544
517
if(ret != GNUTLS_E_SUCCESS){
545
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
519
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
547
521
return -1;
548
522
}
549
523
574
548
safer_gnutls_strerror(ret));
575
549
goto globalfail;
576
550
}
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
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
555
goto globalfail;
556
}
557
751
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
559
753
560
return 0;
755
562
globalfail:
756
563
757
564
gnutls_certificate_free_credentials(mc->cred);
565
gnutls_global_deinit();
758
566
gnutls_dh_params_deinit(mc->dh_params);
759
567
return -1;
760
568
}
761
569
762
__attribute__((nonnull, warn_unused_result))
763
570
static int init_gnutls_session(gnutls_session_t *session,
764
571
mandos_context *mc){
765
572
int ret;
812
619
/* ignore client certificate if any. */
813
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
814
621
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
815
624
return 0;
816
625
}
817
626
819
628
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
629
__attribute__((unused)) const char *txt){}
821
630
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
631
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
632
static int start_mandos_communication(const char *ip, in_port_t port,
1043
633
AvahiIfIndex if_index,
1044
634
int af, mandos_context *mc){
1045
635
int ret, tcp_sd = -1;
1046
636
ssize_t sret;
1047
struct sockaddr_storage to;
637
union {
638
struct sockaddr_in in;
639
struct sockaddr_in6 in6;
640
} to;
1048
641
char *buffer = NULL;
1049
642
char *decrypted_buffer = NULL;
1050
643
size_t buffer_length = 0;
1053
646
int retval = -1;
1054
647
gnutls_session_t session;
1055
648
int pf; /* Protocol family */
1056
bool route_added = false;
1057
649
1058
650
errno = 0;
1059
651
1081
673
bool match = false;
1082
674
{
1083
675
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
1087
678
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
679
match = true;
1089
680
break;
1118
709
PRIuMAX "\n", ip, (uintmax_t)port);
1119
710
}
1120
711
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
713
if(tcp_sd < 0){
1123
714
int e = errno;
1124
715
perror_plus("socket");
1131
722
goto mandos_end;
1132
723
}
1133
724
725
memset(&to, 0, sizeof(to));
1134
726
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);
727
to.in6.sin6_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
729
} 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);
730
to.in.sin_family = (sa_family_t)af;
731
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
732
}
1143
733
if(ret < 0 ){
1144
734
int e = errno;
1153
743
goto mandos_end;
1154
744
}
1155
745
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
1159
756
if(if_index == AVAHI_IF_UNSPEC){
1160
757
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
758
" incomplete without a network interface\n");
1163
760
goto mandos_end;
1164
761
}
1165
762
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
763
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
764
}
1168
765
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
766
to.in.sin_port = htons(port);
1170
767
}
1171
768
1172
769
if(quit_now){
1190
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
789
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
1195
791
addrstr, sizeof(addrstr), NULL, 0,
1196
792
NI_NUMERICHOST);
1197
793
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
1200
795
addrstr, sizeof(addrstr), NULL, 0,
1201
796
NI_NUMERICHOST);
1202
797
}
1214
809
goto mandos_end;
1215
810
}
1216
811
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;
812
if(af == AF_INET6){
813
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
} else {
815
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
816
}
817
if(ret < 0){
818
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
819
int e = errno;
820
perror_plus("connect");
821
errno = e;
822
}
823
goto mandos_end;
824
}
825
826
if(quit_now){
827
errno = EINTR;
828
goto mandos_end;
1272
829
}
1273
830
1274
831
const char *out = mandos_protocol_version;
1428
985
&decrypted_buffer, mc);
1429
986
if(decrypted_buffer_size >= 0){
1430
987
1431
clearerr(stdout);
1432
988
written = 0;
1433
989
while(written < (size_t) decrypted_buffer_size){
1434
990
if(quit_now){
1450
1006
}
1451
1007
written += (size_t)ret;
1452
1008
}
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
1009
retval = 0;
1464
1010
}
1465
1011
}
1468
1014
1469
1015
mandos_end:
1470
1016
{
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
1017
int e = errno;
1478
1018
free(decrypted_buffer);
1479
1019
free(buffer);
1480
1020
if(tcp_sd >= 0){
1481
ret = close(tcp_sd);
1021
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1482
1022
}
1483
1023
if(ret == -1){
1484
1024
if(e == 0){
1509
1049
AVAHI_GCC_UNUSED AvahiStringList *txt,
1510
1050
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1511
1051
flags,
1512
void *mc){
1052
void* mc){
1513
1053
if(r == NULL){
1514
1054
return;
1515
1055
}
1518
1058
timed out */
1519
1059
1520
1060
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1522
1061
return;
1523
1062
}
1524
1063
1569
1108
const char *domain,
1570
1109
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1571
1110
flags,
1572
void *mc){
1111
void* mc){
1573
1112
if(b == NULL){
1574
1113
return;
1575
1114
}
1635
1174
errno = old_errno;
1636
1175
}
1637
1176
1638
__attribute__((nonnull, warn_unused_result))
1639
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1640
1178
int ret;
1641
int old_errno;
1179
error_t ret_errno;
1642
1180
1643
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1644
1182
if(s < 0){
1645
old_errno = errno;
1183
ret_errno = errno;
1646
1184
perror_plus("socket");
1647
errno = old_errno;
1185
errno = ret_errno;
1648
1186
return false;
1649
1187
}
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1188
strcpy(ifr->ifr_name, ifname);
1652
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1653
1190
if(ret == -1){
1654
1191
if(debug){
1655
old_errno = errno;
1192
ret_errno = errno;
1656
1193
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1194
errno = ret_errno;
1658
1195
}
1659
close(s);
1660
1196
return false;
1661
1197
}
1662
close(s);
1663
1198
return true;
1664
1199
}
1665
1200
1666
__attribute__((nonnull, warn_unused_result))
1667
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1668
1202
1669
1203
/* Reject the loopback device */
1711
1245
* corresponds to an acceptable network device.
1712
1246
* (This function is passed to scandir(3) as a filter function.)
1713
1247
*/
1714
__attribute__((nonnull, warn_unused_result))
1715
1248
int good_interface(const struct dirent *if_entry){
1716
1249
if(if_entry->d_name[0] == '.'){
1717
1250
return 0;
1735
1268
/*
1736
1269
* This function determines if a network interface is up.
1737
1270
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
1271
bool interface_is_up(const char *interface){
1740
1272
struct ifreq ifr;
1741
1273
if(not get_flags(interface, &ifr)){
1752
1284
/*
1753
1285
* This function determines if a network interface is running
1754
1286
*/
1755
__attribute__((nonnull, warn_unused_result))
1756
1287
bool interface_is_running(const char *interface){
1757
1288
struct ifreq ifr;
1758
1289
if(not get_flags(interface, &ifr)){
1766
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1767
1298
}
1768
1299
1769
__attribute__((nonnull, pure, warn_unused_result))
1770
1300
int notdotentries(const struct dirent *direntry){
1771
1301
/* Skip "." and ".." */
1772
1302
if(direntry->d_name[0] == '.'
1779
1309
}
1780
1310
1781
1311
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1783
1312
int runnable_hook(const struct dirent *direntry){
1784
1313
int ret;
1785
1314
size_t sret;
1793
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1794
1323
"abcdefghijklmnopqrstuvwxyz"
1795
1324
"0123456789"
1796
"_.-");
1325
"_-");
1797
1326
if((direntry->d_name)[sret] != '\0'){
1798
1327
/* Contains non-allowed characters */
1799
1328
if(debug){
1803
1332
return 0;
1804
1333
}
1805
1334
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1337
if(ret < 0){
1338
perror_plus("asprintf");
1339
return 0;
1340
}
1341
1342
ret = stat(fullname, &st);
1807
1343
if(ret == -1){
1808
1344
if(debug){
1809
1345
perror_plus("Could not stat hook");
1833
1369
return 1;
1834
1370
}
1835
1371
1836
__attribute__((nonnull, warn_unused_result))
1837
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1838
1373
mandos_context *mc){
1839
1374
int ret;
1843
1378
1844
1379
while(true){
1845
1380
if(mc->current_server == NULL){
1846
if(debug){
1381
if (debug){
1847
1382
fprintf_plus(stderr, "Wait until first server is found."
1848
1383
" No timeout!\n");
1849
1384
}
1850
1385
ret = avahi_simple_poll_iterate(s, -1);
1851
1386
} else {
1852
if(debug){
1387
if (debug){
1853
1388
fprintf_plus(stderr, "Check current_server if we should run"
1854
1389
" it, or wait\n");
1855
1390
}
1872
1407
- ((intmax_t)waited_time.tv_sec * 1000))
1873
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
1874
1409
1875
if(debug){
1410
if (debug){
1876
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1877
1412
block_time);
1878
1413
}
1900
1435
ret = avahi_simple_poll_iterate(s, (int)block_time);
1901
1436
}
1902
1437
if(ret != 0){
1903
if(ret > 0 or errno != EINTR){
1438
if (ret > 0 or errno != EINTR){
1904
1439
return (ret != 1) ? ret : 0;
1905
1440
}
1906
1441
}
1907
1442
}
1908
1443
}
1909
1444
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
bool run_network_hooks(const char *mode, const char *interface,
1912
1498
const float delay){
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1919
if(debug){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1922
}
1923
} else {
1924
perror_plus("open");
1925
}
1926
return;
1927
}
1928
}
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
}
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
alphasort);
1936
1502
if(numhooks == -1){
1937
perror_plus("scandir");
1938
close(devnull);
1939
return;
1940
}
1941
struct dirent *direntry;
1942
int ret;
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1945
if(debug){
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1947
direntry->d_name);
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1948
1510
}
1949
pid_t hook_pid = fork();
1950
if(hook_pid == 0){
1951
/* Child */
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1954
if(errno != 0){
1955
perror_plus("Failed to raise privileges");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Set group */
1959
errno = 0;
1960
ret = setgid(0);
1961
if(ret == -1){
1962
perror_plus("setgid");
1963
_exit(EX_NOPERM);
1964
}
1965
/* Reset supplementary groups */
1966
errno = 0;
1967
ret = setgroups(0, NULL);
1968
if(ret == -1){
1969
perror_plus("setgroups");
1970
_exit(EX_NOPERM);
1971
}
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("DEVICE", interface, 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
ret = setenv("MODE", mode, 1);
1988
if(ret == -1){
1989
perror_plus("setenv");
1990
_exit(EX_OSERR);
1991
}
1992
char *delaystring;
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1994
if(ret == -1){
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
if(ret < 0){
1995
1520
perror_plus("asprintf");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("DELAY", delaystring, 1);
1999
if(ret == -1){
1521
continue;
1522
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
pid_t hook_pid = fork();
1528
if(hook_pid == 0){
1529
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
dup2(devnull, STDIN_FILENO);
1545
close(devnull);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
if(ret == -1){
1549
perror_plus("setenv");
1550
_exit(EX_OSERR);
1551
}
1552
ret = setenv("DEVICE", interface, 1);
1553
if(ret == -1){
1554
perror_plus("setenv");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1558
if(ret == -1){
1559
perror_plus("setenv");
1560
_exit(EX_OSERR);
1561
}
1562
ret = setenv("MODE", mode, 1);
1563
if(ret == -1){
1564
perror_plus("setenv");
1565
_exit(EX_OSERR);
1566
}
1567
char *delaystring;
1568
ret = asprintf(&delaystring, "%f", delay);
1569
if(ret == -1){
1570
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1572
}
1573
ret = setenv("DELAY", delaystring, 1);
1574
if(ret == -1){
1575
free(delaystring);
1576
perror_plus("setenv");
1577
_exit(EX_OSERR);
1578
}
2000
1579
free(delaystring);
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
free(delaystring);
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2007
if(ret == -1){
2008
perror_plus("setenv");
2009
_exit(EX_OSERR);
2010
}
2011
}
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
2015
if(hook_fd == -1){
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2018
}
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2022
}
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
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2039
environ) == -1){
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2042
}
2043
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
2049
int status;
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2052
free(direntry);
2053
continue;
2054
}
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2060
free(direntry);
2061
continue;
2062
}
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
2066
WTERMSIG(status));
2067
free(direntry);
2068
continue;
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
2069
1591
} else {
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2072
free(direntry);
2073
continue;
2074
}
2075
}
2076
if(debug){
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
direntry->d_name);
2079
}
2080
free(direntry);
2081
}
2082
free(direntries);
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
2085
} else {
2086
hookdir_fd = -1;
2087
}
2088
close(devnull);
1592
int status;
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1595
free(fullname);
1596
continue;
1597
}
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1603
free(fullname);
1604
continue;
1605
}
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1609
WTERMSIG(status));
1610
free(fullname);
1611
continue;
1612
} else {
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1615
free(fullname);
1616
continue;
1617
}
1618
}
1619
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1623
}
1624
}
1625
close(devnull);
1626
}
1627
return true;
2089
1628
}
2090
1629
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2095
int ret;
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
2096
1636
struct ifreq network;
2097
1637
unsigned int if_index = if_nametoindex(interface);
2098
1638
if(if_index == 0){
2107
1647
}
2108
1648
2109
1649
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
1650
if(not get_flags(interface, &network) and debug){
2113
1651
ret_errno = errno;
2114
1652
fprintf_plus(stderr, "Failed to get flags for interface "
2115
1653
"\"%s\"\n", interface);
2116
errno = old_errno;
2117
1654
return ret_errno;
2118
1655
}
2119
network.ifr_flags |= IFF_UP; /* set flag */
1656
network.ifr_flags |= IFF_UP;
2120
1657
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2122
if(sd == -1){
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
2123
1660
ret_errno = errno;
2124
1661
perror_plus("socket");
2125
1662
errno = old_errno;
2126
1663
return ret_errno;
2127
1664
}
2128
1665
2129
1666
if(quit_now){
2130
ret = close(sd);
2131
if(ret == -1){
2132
perror_plus("close");
2133
}
1667
close(sd);
2134
1668
errno = old_errno;
2135
1669
return EINTR;
2136
1670
}
2140
1674
interface);
2141
1675
}
2142
1676
2143
/* Raise privileges */
2144
ret_errno = raise_privileges();
2145
if(ret_errno != 0){
2146
errno = ret_errno;
2147
perror_plus("Failed to raise privileges");
2148
}
1677
/* Raise priviliges */
1678
raise_privileges();
2149
1679
2150
1680
#ifdef __linux__
2151
int ret_linux;
2152
bool restore_loglevel = false;
2153
if(ret_errno == 0){
2154
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2155
messages about the network interface to mess up the prompt */
2156
ret_linux = klogctl(8, NULL, 5);
2157
if(ret_linux == -1){
2158
perror_plus("klogctl");
2159
} else {
2160
restore_loglevel = true;
2161
}
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
2162
1688
}
2163
1689
#endif /* __linux__ */
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
2166
1692
#ifdef __linux__
2167
1693
if(restore_loglevel){
2168
1694
ret_linux = klogctl(7, NULL, 0);
2172
1698
}
2173
1699
#endif /* __linux__ */
2174
1700
2175
/* If raise_privileges() succeeded above */
2176
if(ret_errno == 0){
2177
/* Lower privileges */
2178
ret_errno = lower_privileges();
2179
if(ret_errno != 0){
2180
errno = ret_errno;
2181
perror_plus("Failed to lower privileges");
2182
}
2183
}
1701
/* Lower privileges */
1702
lower_privileges();
2184
1703
2185
1704
/* Close the socket */
2186
ret = close(sd);
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2187
1706
if(ret == -1){
2188
1707
perror_plus("close");
2189
1708
}
2190
1709
2191
1710
if(ret_setflags == -1){
2192
errno = ioctl_errno;
1711
errno = ret_errno;
2193
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
1713
errno = old_errno;
2195
return ioctl_errno;
1714
return ret_errno;
2196
1715
}
2197
1716
} else if(debug){
2198
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2201
1720
2202
1721
/* Sleep checking until interface is running.
2203
1722
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
1723
for(int i=0; i < delay * 4; i++){
2205
1724
if(interface_is_running(interface)){
2206
1725
break;
2207
1726
}
2216
1735
return 0;
2217
1736
}
2218
1737
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
2222
1740
struct ifreq network;
2223
1741
unsigned int if_index = if_nametoindex(interface);
2224
1742
if(if_index == 0){
2227
1745
return ENXIO;
2228
1746
}
2229
1747
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
1748
error_t ret_errno = 0;
2232
1749
if(not get_flags(interface, &network) and debug){
2233
1750
ret_errno = errno;
2234
1751
fprintf_plus(stderr, "Failed to get flags for interface "
2235
1752
"\"%s\"\n", interface);
2236
errno = old_errno;
2237
1753
return ret_errno;
2238
1754
}
2239
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
1756
2241
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2242
if(sd == -1){
1758
if(sd < 0){
2243
1759
ret_errno = errno;
2244
1760
perror_plus("socket");
2245
1761
errno = old_errno;
2251
1767
interface);
2252
1768
}
2253
1769
2254
/* Raise privileges */
2255
ret_errno = raise_privileges();
2256
if(ret_errno != 0){
2257
errno = ret_errno;
2258
perror_plus("Failed to raise privileges");
2259
}
1770
/* Raise priviliges */
1771
raise_privileges();
2260
1772
2261
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
1774
ret_errno = errno;
2263
1775
2264
/* If raise_privileges() succeeded above */
2265
if(ret_errno == 0){
2266
/* Lower privileges */
2267
ret_errno = lower_privileges();
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("Failed to lower privileges");
2271
}
2272
}
1776
/* Lower privileges */
1777
lower_privileges();
2273
1778
2274
1779
/* Close the socket */
2275
int ret = close(sd);
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2276
1781
if(ret == -1){
2277
1782
perror_plus("close");
2278
1783
}
2279
1784
2280
1785
if(ret_setflags == -1){
2281
errno = ioctl_errno;
1786
errno = ret_errno;
2282
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
1788
errno = old_errno;
2284
return ioctl_errno;
1789
return ret_errno;
2285
1790
}
2286
1791
} else if(debug){
2287
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2293
1798
}
2294
1799
2295
1800
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 };
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
2301
1805
AvahiSServiceBrowser *sb = NULL;
2302
1806
error_t ret_errno;
2303
1807
int ret;
2306
1810
int exitcode = EXIT_SUCCESS;
2307
1811
char *interfaces_to_take_down = NULL;
2308
1812
size_t interfaces_to_take_down_size = 0;
2309
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2310
char old_tempdir[] = "/tmp/mandosXXXXXX";
2311
char *tempdir = NULL;
1813
char tempdir[] = "/tmp/mandosXXXXXX";
1814
bool tempdir_created = false;
2312
1815
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2313
1816
const char *seckey = PATHDIR "/" SECKEY;
2314
1817
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
1818
char *interfaces_hooks = NULL;
2317
1819
2318
1820
bool gnutls_initialized = false;
2371
1873
.doc = "Bit length of the prime number used in the"
2372
1874
" Diffie-Hellman key exchange",
2373
1875
.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
1876
{ .name = "priority", .key = 130,
2380
1877
.arg = "STRING",
2381
1878
.doc = "GnuTLS priority string for the TLS handshake",
2436
1933
}
2437
1934
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2438
1935
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
2442
1936
case 130: /* --priority */
2443
1937
mc.priority = arg;
2444
1938
break;
2484
1978
.args_doc = "",
2485
1979
.doc = "Mandos client -- Get and decrypt"
2486
1980
" 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){
1981
ret = argp_parse(&argp, argc, argv,
1982
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1983
switch(ret){
2490
1984
case 0:
2491
1985
break;
2492
1986
case ENOMEM:
2493
1987
default:
2494
errno = ret_errno;
1988
errno = ret;
2495
1989
perror_plus("argp_parse");
2496
1990
exitcode = EX_OSERR;
2497
1991
goto end;
2500
1994
goto end;
2501
1995
}
2502
1996
}
2503
1997
2504
1998
{
2505
1999
/* Work around Debian bug #633582:
2506
<https://bugs.debian.org/633582> */
2000
<http://bugs.debian.org/633582> */
2507
2001
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2512
perror_plus("Failed to raise privileges");
2513
} else {
2002
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2514
2004
struct stat st;
2515
2005
2516
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2530
2020
}
2531
2021
}
2532
2022
}
2533
close(seckey_fd);
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2534
2024
}
2535
2025
}
2536
2026
2537
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2538
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2539
2029
if(pubkey_fd == -1){
2551
2041
}
2552
2042
}
2553
2043
}
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
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2580
2048
/* Lower privileges */
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2584
perror_plus("Failed to lower privileges");
2585
}
2049
lower_privileges();
2586
2050
}
2587
2051
}
2588
2052
2614
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2616
2080
}
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
2084
}
2619
2085
}
2620
2086
2621
2087
if(not debug){
2699
2165
2700
2166
/* If no interfaces were specified, make a list */
2701
2167
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2168
struct dirent **direntries;
2703
2169
/* Look for any good interfaces */
2704
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2705
2171
alphasort);
2711
2177
if(ret_errno != 0){
2712
2178
errno = ret_errno;
2713
2179
perror_plus("argz_add");
2714
free(direntries[i]);
2715
2180
continue;
2716
2181
}
2717
2182
if(debug){
2718
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
2184
direntries[i]->d_name);
2720
2185
}
2721
free(direntries[i]);
2722
2186
}
2723
2187
free(direntries);
2724
2188
} else {
2725
if(ret == 0){
2726
free(direntries);
2727
}
2189
free(direntries);
2728
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2729
2191
exitcode = EXIT_FAILURE;
2730
2192
goto end;
2753
2215
break;
2754
2216
}
2755
2217
bool interface_was_up = interface_is_up(interface);
2756
errno = bring_up_interface(interface, delay);
2218
ret = bring_up_interface(interface, delay);
2757
2219
if(not interface_was_up){
2758
if(errno != 0){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2761
2223
} else {
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2764
interface);
2765
if(errno != 0){
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2766
2229
perror_plus("argz_add");
2767
2230
}
2768
2231
}
2786
2249
goto end;
2787
2250
}
2788
2251
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2790
2253
if(ret == -1){
2791
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
2792
2255
exitcode = EX_UNAVAILABLE;
2799
2262
goto end;
2800
2263
}
2801
2264
2802
/* Try /run/tmp before /tmp */
2803
tempdir = mkdtemp(run_tempdir);
2804
if(tempdir == NULL and errno == ENOENT){
2805
if(debug){
2806
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2807
run_tempdir, old_tempdir);
2808
}
2809
tempdir = mkdtemp(old_tempdir);
2810
}
2811
if(tempdir == NULL){
2265
if(mkdtemp(tempdir) == NULL){
2812
2266
perror_plus("mkdtemp");
2813
2267
goto end;
2814
2268
}
2269
tempdir_created = true;
2815
2270
2816
2271
if(quit_now){
2817
2272
goto end;
2892
2347
sleep((unsigned int)retry_interval);
2893
2348
}
2894
2349
2895
if(not quit_now){
2350
if (not quit_now){
2896
2351
exitcode = EXIT_SUCCESS;
2897
2352
}
2898
2353
2914
2369
2915
2370
/* Allocate a new server */
2916
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2372
&config, NULL, NULL, &ret_errno);
2918
2373
2919
2374
/* Free the Avahi configuration data */
2920
2375
avahi_server_config_free(&config);
2923
2378
/* Check if creating the Avahi server object succeeded */
2924
2379
if(mc.server == NULL){
2925
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2381
avahi_strerror(ret_errno));
2927
2382
exitcode = EX_UNAVAILABLE;
2928
2383
goto end;
2929
2384
}
2953
2408
if(debug){
2954
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2955
2410
}
2956
2411
2957
2412
ret = avahi_loop_with_timeout(simple_poll,
2958
2413
(int)(retry_interval * 1000), &mc);
2959
2414
if(debug){
2964
2419
end:
2965
2420
2966
2421
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
}
2422
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2974
2423
}
2975
2424
2976
2425
/* Cleanup things */
2987
2436
2988
2437
if(gnutls_initialized){
2989
2438
gnutls_certificate_free_credentials(mc.cred);
2439
gnutls_global_deinit();
2990
2440
gnutls_dh_params_deinit(mc.dh_params);
2991
2441
}
2992
2442
3000
2450
mc.current_server->prev->next = NULL;
3001
2451
while(mc.current_server != NULL){
3002
2452
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
2453
free(mc.current_server);
3012
2454
mc.current_server = next;
3013
2455
}
3014
2456
}
3015
2457
3016
/* Re-raise privileges */
2458
/* Re-raise priviliges */
3017
2459
{
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
3021
perror_plus("Failed to raise privileges");
3022
} else {
3023
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3027
3028
/* Take down the network interfaces which were brought up */
3029
{
3030
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;
3037
perror_plus("Failed to take down interface");
3038
}
3039
}
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3042
" down\n");
3043
}
3044
}
3045
}
3046
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to lower privileges permanently");
3051
}
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
2476
}
2477
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2481
}
2482
}
2483
2484
lower_privileges_permanently();
3052
2485
}
3053
2486
3054
2487
free(interfaces_to_take_down);
3055
2488
free(interfaces_hooks);
3056
2489
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
2490
/* Removes the GPGME temp directory and all files inside */
2491
if(tempdir_created){
3059
2492
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){
2493
struct dirent *direntry = NULL;
2494
int numentries = scandir(tempdir, &direntries, notdotentries,
2495
alphasort);
2496
if (numentries > 0){
3073
2497
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
/* Removes the GPGME temp directory and all files inside */
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
2498
direntry = direntries[i];
2499
char *fullname = NULL;
2500
ret = asprintf(&fullname, "%s/%s", tempdir,
2501
direntry->d_name);
2502
if(ret < 0){
2503
perror_plus("asprintf");
2504
continue;
2505
}
2506
ret = remove(fullname);
2507
if(ret == -1){
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2509
strerror(errno));
2510
}
2511
free(fullname);
2512
}
2513
}
2514
2515
/* need to clean even if 0 because man page doesn't specify */
2516
free(direntries);
2517
if (numentries == -1){
2518
perror_plus("scandir");
2519
}
2520
ret = rmdir(tempdir);
2521
if(ret == -1 and errno != ENOENT){
2522
perror_plus("rmdir");
2523
}
3114
2524
}
3115
2525
3116
2526
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0