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- Committer: Teddy Hogeborn
- Date: 2013-10-13 15:43:42 UTC
- Revision ID: teddy@recompile.se-20131013154342-2ztabynqog6xuk0t
* initramfs-unpack: Bug fix: Made executable.
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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
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,
64
#include <errno.h> /* perror(), errno,
72
65
program_invocation_short_name */
73
66
#include <time.h> /* nanosleep(), time(), sleep() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
99
91
argz_delete(), argz_append(),
100
92
argz_stringify(), argz_add(),
101
93
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
94
105
95
#ifdef __linux__
106
96
#include <sys/klog.h> /* klogctl() */
148
138
static const char sys_class_net[] = "/sys/class/net";
149
139
char *connect_to = NULL;
150
140
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
141
uid_t uid = 65534;
153
142
gid_t gid = 65534;
154
143
191
180
perror(print_text);
192
181
}
193
182
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
195
184
int fprintf_plus(FILE *stream, const char *format, ...){
196
185
va_list ap;
197
186
va_start (ap, format);
206
195
* bytes. "buffer_capacity" is how much is currently allocated,
207
196
* "buffer_length" is how much is already used.
208
197
*/
209
__attribute__((nonnull, warn_unused_result))
210
198
size_t incbuffer(char **buffer, size_t buffer_length,
211
199
size_t buffer_capacity){
212
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
219
203
return 0;
220
204
}
221
*buffer = new_buf;
222
205
buffer_capacity += BUFFER_SIZE;
223
206
}
224
207
return buffer_capacity;
225
208
}
226
209
227
210
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
212
int af, server **current_server){
231
213
int ret;
240
222
.af = af };
241
223
if(new_server->ip == NULL){
242
224
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
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
225
return false;
259
226
}
260
227
/* Special case of first server */
262
229
new_server->next = new_server;
263
230
new_server->prev = new_server;
264
231
*current_server = new_server;
232
/* Place the new server last in the list */
265
233
} else {
266
/* Place the new server last in the list */
267
234
new_server->next = *current_server;
268
235
new_server->prev = (*current_server)->prev;
269
236
new_server->prev->next = new_server;
270
237
(*current_server)->prev = new_server;
271
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
272
244
return true;
273
245
}
274
246
275
247
/*
276
248
* Initialize GPGME.
277
249
*/
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){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
283
252
gpgme_error_t rc;
284
253
gpgme_engine_info_t engine_info;
285
254
286
255
/*
287
256
* Helper function to insert pub and seckey to the engine keyring.
288
257
*/
289
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
290
259
int ret;
291
260
int fd;
292
261
gpgme_data_t pgp_data;
311
280
return false;
312
281
}
313
282
314
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
284
if(ret == -1){
316
285
perror_plus("close");
317
286
}
373
342
* Decrypt OpenPGP data.
374
343
* Returns -1 on error
375
344
*/
376
__attribute__((nonnull, warn_unused_result))
377
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
346
size_t crypto_size,
379
347
char **plaintext,
499
467
return plaintext_length;
500
468
}
501
469
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){
470
static const char * safer_gnutls_strerror(int value){
511
471
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
513
475
}
514
476
515
477
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
478
static void debuggnutls(__attribute__((unused)) int level,
518
479
const char* string){
519
480
fprintf_plus(stderr, "GnuTLS: %s", string);
520
481
}
521
482
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
483
static int init_gnutls_global(const char *pubkeyfilename,
524
484
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
485
mandos_context *mc){
527
486
int ret;
528
unsigned int uret;
529
487
530
488
if(debug){
531
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
490
}
533
491
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
534
499
if(debug){
535
500
/* "Use a log level over 10 to enable all debugging options."
536
501
* - GnuTLS manual
544
509
if(ret != GNUTLS_E_SUCCESS){
545
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
547
513
return -1;
548
514
}
549
515
574
540
safer_gnutls_strerror(ret));
575
541
goto globalfail;
576
542
}
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
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
751
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
551
753
552
return 0;
755
554
globalfail:
756
555
757
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
758
558
gnutls_dh_params_deinit(mc->dh_params);
759
559
return -1;
760
560
}
761
561
762
__attribute__((nonnull, warn_unused_result))
763
562
static int init_gnutls_session(gnutls_session_t *session,
764
563
mandos_context *mc){
765
564
int ret;
812
611
/* ignore client certificate if any. */
813
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
814
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
815
616
return 0;
816
617
}
817
618
819
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
621
__attribute__((unused)) const char *txt){}
821
622
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
623
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
624
static int start_mandos_communication(const char *ip, in_port_t port,
1043
625
AvahiIfIndex if_index,
1044
626
int af, mandos_context *mc){
1045
627
int ret, tcp_sd = -1;
1046
628
ssize_t sret;
1047
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1048
633
char *buffer = NULL;
1049
634
char *decrypted_buffer = NULL;
1050
635
size_t buffer_length = 0;
1053
638
int retval = -1;
1054
639
gnutls_session_t session;
1055
640
int pf; /* Protocol family */
1056
bool route_added = false;
1057
641
1058
642
errno = 0;
1059
643
1081
665
bool match = false;
1082
666
{
1083
667
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1087
670
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
671
match = true;
1089
672
break;
1118
701
PRIuMAX "\n", ip, (uintmax_t)port);
1119
702
}
1120
703
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
705
if(tcp_sd < 0){
1123
706
int e = errno;
1124
707
perror_plus("socket");
1131
714
goto mandos_end;
1132
715
}
1133
716
717
memset(&to, 0, sizeof(to));
1134
718
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);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
721
} 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);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
724
}
1143
725
if(ret < 0 ){
1144
726
int e = errno;
1153
735
goto mandos_end;
1154
736
}
1155
737
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)){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
1159
742
if(if_index == AVAHI_IF_UNSPEC){
1160
743
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
744
" incomplete without a network interface\n");
1163
746
goto mandos_end;
1164
747
}
1165
748
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
750
}
1168
751
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1170
755
}
1171
756
1172
757
if(quit_now){
1189
774
}
1190
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
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;
777
const char *pcret;
778
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
781
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
784
}
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
787
} else {
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
790
}
791
}
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
799
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
801
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
803
}
804
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
int e = errno;
807
perror_plus("connect");
808
errno = e;
809
}
810
goto mandos_end;
811
}
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
1272
816
}
1273
817
1274
818
const char *out = mandos_protocol_version;
1428
972
&decrypted_buffer, mc);
1429
973
if(decrypted_buffer_size >= 0){
1430
974
1431
clearerr(stdout);
1432
975
written = 0;
1433
976
while(written < (size_t) decrypted_buffer_size){
1434
977
if(quit_now){
1450
993
}
1451
994
written += (size_t)ret;
1452
995
}
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
996
retval = 0;
1464
997
}
1465
998
}
1468
1001
1469
1002
mandos_end:
1470
1003
{
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
1004
int e = errno;
1478
1005
free(decrypted_buffer);
1479
1006
free(buffer);
1480
1007
if(tcp_sd >= 0){
1481
ret = close(tcp_sd);
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1482
1009
}
1483
1010
if(ret == -1){
1484
1011
if(e == 0){
1509
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1510
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1511
1038
flags,
1512
void *mc){
1039
void* mc){
1513
1040
if(r == NULL){
1514
1041
return;
1515
1042
}
1518
1045
timed out */
1519
1046
1520
1047
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1522
1048
return;
1523
1049
}
1524
1050
1569
1095
const char *domain,
1570
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1571
1097
flags,
1572
void *mc){
1098
void* mc){
1573
1099
if(b == NULL){
1574
1100
return;
1575
1101
}
1635
1161
errno = old_errno;
1636
1162
}
1637
1163
1638
__attribute__((nonnull, warn_unused_result))
1639
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1640
1165
int ret;
1641
int old_errno;
1166
error_t ret_errno;
1642
1167
1643
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1644
1169
if(s < 0){
1645
old_errno = errno;
1170
ret_errno = errno;
1646
1171
perror_plus("socket");
1647
errno = old_errno;
1172
errno = ret_errno;
1648
1173
return false;
1649
1174
}
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1175
strcpy(ifr->ifr_name, ifname);
1652
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1653
1177
if(ret == -1){
1654
1178
if(debug){
1655
old_errno = errno;
1179
ret_errno = errno;
1656
1180
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1181
errno = ret_errno;
1658
1182
}
1659
close(s);
1660
1183
return false;
1661
1184
}
1662
close(s);
1663
1185
return true;
1664
1186
}
1665
1187
1666
__attribute__((nonnull, warn_unused_result))
1667
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1668
1189
1669
1190
/* Reject the loopback device */
1711
1232
* corresponds to an acceptable network device.
1712
1233
* (This function is passed to scandir(3) as a filter function.)
1713
1234
*/
1714
__attribute__((nonnull, warn_unused_result))
1715
1235
int good_interface(const struct dirent *if_entry){
1716
1236
if(if_entry->d_name[0] == '.'){
1717
1237
return 0;
1735
1255
/*
1736
1256
* This function determines if a network interface is up.
1737
1257
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
1258
bool interface_is_up(const char *interface){
1740
1259
struct ifreq ifr;
1741
1260
if(not get_flags(interface, &ifr)){
1752
1271
/*
1753
1272
* This function determines if a network interface is running
1754
1273
*/
1755
__attribute__((nonnull, warn_unused_result))
1756
1274
bool interface_is_running(const char *interface){
1757
1275
struct ifreq ifr;
1758
1276
if(not get_flags(interface, &ifr)){
1766
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1767
1285
}
1768
1286
1769
__attribute__((nonnull, pure, warn_unused_result))
1770
1287
int notdotentries(const struct dirent *direntry){
1771
1288
/* Skip "." and ".." */
1772
1289
if(direntry->d_name[0] == '.'
1779
1296
}
1780
1297
1781
1298
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1783
1299
int runnable_hook(const struct dirent *direntry){
1784
1300
int ret;
1785
1301
size_t sret;
1793
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1794
1310
"abcdefghijklmnopqrstuvwxyz"
1795
1311
"0123456789"
1796
"_.-");
1312
"_-");
1797
1313
if((direntry->d_name)[sret] != '\0'){
1798
1314
/* Contains non-allowed characters */
1799
1315
if(debug){
1803
1319
return 0;
1804
1320
}
1805
1321
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1807
1330
if(ret == -1){
1808
1331
if(debug){
1809
1332
perror_plus("Could not stat hook");
1833
1356
return 1;
1834
1357
}
1835
1358
1836
__attribute__((nonnull, warn_unused_result))
1837
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1838
1360
mandos_context *mc){
1839
1361
int ret;
1843
1365
1844
1366
while(true){
1845
1367
if(mc->current_server == NULL){
1846
if(debug){
1368
if (debug){
1847
1369
fprintf_plus(stderr, "Wait until first server is found."
1848
1370
" No timeout!\n");
1849
1371
}
1850
1372
ret = avahi_simple_poll_iterate(s, -1);
1851
1373
} else {
1852
if(debug){
1374
if (debug){
1853
1375
fprintf_plus(stderr, "Check current_server if we should run"
1854
1376
" it, or wait\n");
1855
1377
}
1872
1394
- ((intmax_t)waited_time.tv_sec * 1000))
1873
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1874
1396
1875
if(debug){
1397
if (debug){
1876
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1877
1399
block_time);
1878
1400
}
1900
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1901
1423
}
1902
1424
if(ret != 0){
1903
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
1904
1426
return (ret != 1) ? ret : 0;
1905
1427
}
1906
1428
}
1907
1429
}
1908
1430
}
1909
1431
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1912
1485
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);
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1936
1491
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);
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1948
1499
}
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){
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1995
1507
perror_plus("asprintf");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("DELAY", delaystring, 1);
1999
if(ret == -1){
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
2000
1566
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;
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
2069
1578
} 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);
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
2089
1615
}
2090
1616
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;
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
2096
1623
struct ifreq network;
2097
1624
unsigned int if_index = if_nametoindex(interface);
2098
1625
if(if_index == 0){
2107
1634
}
2108
1635
2109
1636
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
2113
1638
ret_errno = errno;
2114
1639
fprintf_plus(stderr, "Failed to get flags for interface "
2115
1640
"\"%s\"\n", interface);
2116
errno = old_errno;
2117
1641
return ret_errno;
2118
1642
}
2119
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
2120
1644
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2122
if(sd == -1){
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2123
1647
ret_errno = errno;
2124
1648
perror_plus("socket");
2125
1649
errno = old_errno;
2126
1650
return ret_errno;
2127
1651
}
2128
1652
2129
1653
if(quit_now){
2130
ret = close(sd);
2131
if(ret == -1){
2132
perror_plus("close");
2133
}
1654
close(sd);
2134
1655
errno = old_errno;
2135
1656
return EINTR;
2136
1657
}
2140
1661
interface);
2141
1662
}
2142
1663
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
}
1664
/* Raise priviliges */
1665
raise_privileges();
2149
1666
2150
1667
#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
}
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
2162
1675
}
2163
1676
#endif /* __linux__ */
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2166
1679
#ifdef __linux__
2167
1680
if(restore_loglevel){
2168
1681
ret_linux = klogctl(7, NULL, 0);
2172
1685
}
2173
1686
#endif /* __linux__ */
2174
1687
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
}
1688
/* Lower privileges */
1689
lower_privileges();
2184
1690
2185
1691
/* Close the socket */
2186
ret = close(sd);
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2187
1693
if(ret == -1){
2188
1694
perror_plus("close");
2189
1695
}
2190
1696
2191
1697
if(ret_setflags == -1){
2192
errno = ioctl_errno;
1698
errno = ret_errno;
2193
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
1700
errno = old_errno;
2195
return ioctl_errno;
1701
return ret_errno;
2196
1702
}
2197
1703
} else if(debug){
2198
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2201
1707
2202
1708
/* Sleep checking until interface is running.
2203
1709
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
1710
for(int i=0; i < delay * 4; i++){
2205
1711
if(interface_is_running(interface)){
2206
1712
break;
2207
1713
}
2216
1722
return 0;
2217
1723
}
2218
1724
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
2222
1730
struct ifreq network;
2223
1731
unsigned int if_index = if_nametoindex(interface);
2224
1732
if(if_index == 0){
2227
1735
return ENXIO;
2228
1736
}
2229
1737
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
2232
1738
if(not get_flags(interface, &network) and debug){
2233
1739
ret_errno = errno;
2234
1740
fprintf_plus(stderr, "Failed to get flags for interface "
2235
1741
"\"%s\"\n", interface);
2236
errno = old_errno;
2237
1742
return ret_errno;
2238
1743
}
2239
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
1745
2241
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2242
if(sd == -1){
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2243
1748
ret_errno = errno;
2244
1749
perror_plus("socket");
2245
1750
errno = old_errno;
2251
1756
interface);
2252
1757
}
2253
1758
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
}
2260
2261
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
2263
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
}
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
2273
1767
2274
1768
/* Close the socket */
2275
int ret = close(sd);
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2276
1770
if(ret == -1){
2277
1771
perror_plus("close");
2278
1772
}
2279
1773
2280
1774
if(ret_setflags == -1){
2281
errno = ioctl_errno;
1775
errno = ret_errno;
2282
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
1777
errno = old_errno;
2284
return ioctl_errno;
1778
return ret_errno;
2285
1779
}
2286
1780
} else if(debug){
2287
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2293
1787
}
2294
1788
2295
1789
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 };
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
2301
1794
AvahiSServiceBrowser *sb = NULL;
2302
1795
error_t ret_errno;
2303
1796
int ret;
2306
1799
int exitcode = EXIT_SUCCESS;
2307
1800
char *interfaces_to_take_down = NULL;
2308
1801
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;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2312
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2313
1805
const char *seckey = PATHDIR "/" SECKEY;
2314
1806
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
2317
1809
2318
1810
bool gnutls_initialized = false;
2319
1811
bool gpgme_initialized = false;
2371
1863
.doc = "Bit length of the prime number used in the"
2372
1864
" Diffie-Hellman key exchange",
2373
1865
.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
1866
{ .name = "priority", .key = 130,
2380
1867
.arg = "STRING",
2381
1868
.doc = "GnuTLS priority string for the TLS handshake",
2436
1923
}
2437
1924
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2438
1925
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
2442
1926
case 130: /* --priority */
2443
1927
mc.priority = arg;
2444
1928
break;
2484
1968
.args_doc = "",
2485
1969
.doc = "Mandos client -- Get and decrypt"
2486
1970
" 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){
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2490
1974
case 0:
2491
1975
break;
2492
1976
case ENOMEM:
2493
1977
default:
2494
errno = ret_errno;
1978
errno = ret;
2495
1979
perror_plus("argp_parse");
2496
1980
exitcode = EX_OSERR;
2497
1981
goto end;
2500
1984
goto end;
2501
1985
}
2502
1986
}
2503
1987
2504
1988
{
2505
1989
/* Work around Debian bug #633582:
2506
<https://bugs.debian.org/633582> */
1990
<http://bugs.debian.org/633582> */
2507
1991
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2512
perror_plus("Failed to raise privileges");
2513
} else {
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2514
1994
struct stat st;
2515
1995
2516
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2530
2010
}
2531
2011
}
2532
2012
}
2533
close(seckey_fd);
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2534
2014
}
2535
2015
}
2536
2016
2537
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2538
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2539
2019
if(pubkey_fd == -1){
2551
2031
}
2552
2032
}
2553
2033
}
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
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2580
2038
/* Lower privileges */
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2584
perror_plus("Failed to lower privileges");
2585
}
2039
lower_privileges();
2586
2040
}
2587
2041
}
2588
2042
2612
2066
goto end;
2613
2067
}
2614
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2616
}
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2619
2077
}
2620
2078
2621
2079
if(not debug){
2699
2157
2700
2158
/* If no interfaces were specified, make a list */
2701
2159
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2160
struct dirent **direntries;
2703
2161
/* Look for any good interfaces */
2704
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2705
2163
alphasort);
2709
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2710
2168
direntries[i]->d_name);
2711
2169
if(ret_errno != 0){
2712
errno = ret_errno;
2713
2170
perror_plus("argz_add");
2714
free(direntries[i]);
2715
2171
continue;
2716
2172
}
2717
2173
if(debug){
2718
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
2175
direntries[i]->d_name);
2720
2176
}
2721
free(direntries[i]);
2722
2177
}
2723
2178
free(direntries);
2724
2179
} else {
2725
if(ret == 0){
2726
free(direntries);
2727
}
2180
free(direntries);
2728
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2729
2182
exitcode = EXIT_FAILURE;
2730
2183
goto end;
2753
2206
break;
2754
2207
}
2755
2208
bool interface_was_up = interface_is_up(interface);
2756
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2757
2210
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));
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2761
2214
} else {
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2764
interface);
2765
if(errno != 0){
2766
perror_plus("argz_add");
2767
}
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2768
2218
}
2769
2219
}
2770
2220
}
2786
2236
goto end;
2787
2237
}
2788
2238
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2790
2240
if(ret == -1){
2791
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2792
2242
exitcode = EX_UNAVAILABLE;
2799
2249
goto end;
2800
2250
}
2801
2251
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){
2252
if(mkdtemp(tempdir) == NULL){
2812
2253
perror_plus("mkdtemp");
2813
2254
goto end;
2814
2255
}
2256
tempdir_created = true;
2815
2257
2816
2258
if(quit_now){
2817
2259
goto end;
2892
2334
sleep((unsigned int)retry_interval);
2893
2335
}
2894
2336
2895
if(not quit_now){
2337
if (not quit_now){
2896
2338
exitcode = EXIT_SUCCESS;
2897
2339
}
2898
2340
2914
2356
2915
2357
/* Allocate a new server */
2916
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2359
&config, NULL, NULL, &ret_errno);
2918
2360
2919
2361
/* Free the Avahi configuration data */
2920
2362
avahi_server_config_free(&config);
2923
2365
/* Check if creating the Avahi server object succeeded */
2924
2366
if(mc.server == NULL){
2925
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2368
avahi_strerror(ret_errno));
2927
2369
exitcode = EX_UNAVAILABLE;
2928
2370
goto end;
2929
2371
}
2953
2395
if(debug){
2954
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2955
2397
}
2956
2398
2957
2399
ret = avahi_loop_with_timeout(simple_poll,
2958
2400
(int)(retry_interval * 1000), &mc);
2959
2401
if(debug){
2964
2406
end:
2965
2407
2966
2408
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
}
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2974
2410
}
2975
2411
2976
2412
/* Cleanup things */
2987
2423
2988
2424
if(gnutls_initialized){
2989
2425
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
2990
2427
gnutls_dh_params_deinit(mc.dh_params);
2991
2428
}
2992
2429
3000
2437
mc.current_server->prev->next = NULL;
3001
2438
while(mc.current_server != NULL){
3002
2439
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
2440
free(mc.current_server);
3012
2441
mc.current_server = next;
3013
2442
}
3014
2443
}
3015
2444
3016
/* Re-raise privileges */
2445
/* Re-raise priviliges */
3017
2446
{
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
}
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
3052
2472
}
3053
2473
3054
2474
free(interfaces_to_take_down);
3055
2475
free(interfaces_hooks);
3056
2476
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
2477
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
3059
2479
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){
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
3073
2484
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);
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2499
}
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2510
}
3114
2511
}
3115
2512
3116
2513
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0