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- Committer: Teddy Hogeborn
- Date: 2012-06-17 02:30:59 UTC
- Revision ID: teddy@recompile.se-20120617023059-em4nfnxg1tsn64xj
* plugins.d/mandos-client (start_mandos_communication): Bug fix; skip
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
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);
198
187
199
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
189
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
191
}
203
192
204
193
/*
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
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
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
754
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
755
551
756
552
return 0;
758
554
globalfail:
759
555
760
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
761
558
gnutls_dh_params_deinit(mc->dh_params);
762
559
return -1;
763
560
}
764
561
765
__attribute__((nonnull, warn_unused_result))
766
562
static int init_gnutls_session(gnutls_session_t *session,
767
563
mandos_context *mc){
768
564
int ret;
815
611
/* ignore client certificate if any. */
816
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
817
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
818
616
return 0;
819
617
}
820
618
822
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
823
621
__attribute__((unused)) const char *txt){}
824
622
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
1043
623
/* Called when a Mandos server is found */
1044
__attribute__((nonnull, warn_unused_result))
1045
624
static int start_mandos_communication(const char *ip, in_port_t port,
1046
625
AvahiIfIndex if_index,
1047
626
int af, mandos_context *mc){
1048
627
int ret, tcp_sd = -1;
1049
628
ssize_t sret;
1050
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1051
633
char *buffer = NULL;
1052
634
char *decrypted_buffer = NULL;
1053
635
size_t buffer_length = 0;
1056
638
int retval = -1;
1057
639
gnutls_session_t session;
1058
640
int pf; /* Protocol family */
1059
bool route_added = false;
1060
641
1061
642
errno = 0;
1062
643
1078
659
return -1;
1079
660
}
1080
661
1081
/* If the interface is specified and we have a list of interfaces */
1082
662
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1083
663
/* Check if the interface is one of the interfaces we are using */
1084
664
bool match = false;
1085
665
{
1086
666
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
1090
669
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
670
match = true;
1092
671
break;
1094
673
}
1095
674
}
1096
675
if(not match){
1097
/* This interface does not match any in the list, so we don't
1098
connect to the server */
1099
676
if(debug){
1100
677
char interface[IF_NAMESIZE];
1101
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1121
698
PRIuMAX "\n", ip, (uintmax_t)port);
1122
699
}
1123
700
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
1125
702
if(tcp_sd < 0){
1126
703
int e = errno;
1127
704
perror_plus("socket");
1134
711
goto mandos_end;
1135
712
}
1136
713
714
memset(&to, 0, sizeof(to));
1137
715
if(af == AF_INET6){
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
716
to.in6.sin6_family = (sa_family_t)af;
717
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1141
718
} else { /* IPv4 */
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
719
to.in.sin_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in.sin_addr);
1145
721
}
1146
722
if(ret < 0 ){
1147
723
int e = errno;
1156
732
goto mandos_end;
1157
733
}
1158
734
if(af == AF_INET6){
1159
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1160
if(IN6_IS_ADDR_LINKLOCAL
1161
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
735
to.in6.sin6_port = htons(port);
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
738
-Wunreachable-code*/
1162
739
if(if_index == AVAHI_IF_UNSPEC){
1163
740
fprintf_plus(stderr, "An IPv6 link-local address is"
1164
741
" incomplete without a network interface\n");
1166
743
goto mandos_end;
1167
744
}
1168
745
/* Set the network interface number as scope */
1169
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
746
to.in6.sin6_scope_id = (uint32_t)if_index;
1170
747
}
1171
748
} else {
1172
((struct sockaddr_in *)&to)->sin_port = htons(port);
749
to.in.sin_port = htons(port); /* Spurious warnings from
750
-Wconversion and
751
-Wunreachable-code */
1173
752
}
1174
753
1175
754
if(quit_now){
1192
771
}
1193
772
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1194
773
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1195
if(af == AF_INET6){
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in6),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
} else {
1201
ret = getnameinfo((struct sockaddr *)&to,
1202
sizeof(struct sockaddr_in),
1203
addrstr, sizeof(addrstr), NULL, 0,
1204
NI_NUMERICHOST);
1205
}
1206
if(ret == EAI_SYSTEM){
1207
perror_plus("getnameinfo");
1208
} else if(ret != 0) {
1209
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1210
} else if(strcmp(addrstr, ip) != 0){
1211
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1212
}
1213
}
1214
1215
if(quit_now){
1216
errno = EINTR;
1217
goto mandos_end;
1218
}
1219
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
774
const char *pcret;
775
if(af == AF_INET6){
776
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
777
sizeof(addrstr));
778
} else {
779
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
780
sizeof(addrstr));
781
}
782
if(pcret == NULL){
783
perror_plus("inet_ntop");
784
} else {
785
if(strcmp(addrstr, ip) != 0){
786
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
787
}
788
}
789
}
790
791
if(quit_now){
792
errno = EINTR;
793
goto mandos_end;
794
}
795
796
if(af == AF_INET6){
797
ret = connect(tcp_sd, &to.in6, sizeof(to));
798
} else {
799
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
800
}
801
if(ret < 0){
802
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
803
int e = errno;
804
perror_plus("connect");
805
errno = e;
806
}
807
goto mandos_end;
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
1275
813
}
1276
814
1277
815
const char *out = mandos_protocol_version;
1431
969
&decrypted_buffer, mc);
1432
970
if(decrypted_buffer_size >= 0){
1433
971
1434
clearerr(stdout);
1435
972
written = 0;
1436
973
while(written < (size_t) decrypted_buffer_size){
1437
974
if(quit_now){
1453
990
}
1454
991
written += (size_t)ret;
1455
992
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1466
993
retval = 0;
1467
994
}
1468
995
}
1471
998
1472
999
mandos_end:
1473
1000
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
1480
1001
int e = errno;
1481
1002
free(decrypted_buffer);
1482
1003
free(buffer);
1483
1004
if(tcp_sd >= 0){
1484
ret = close(tcp_sd);
1005
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1485
1006
}
1486
1007
if(ret == -1){
1487
1008
if(e == 0){
1512
1033
AVAHI_GCC_UNUSED AvahiStringList *txt,
1513
1034
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1514
1035
flags,
1515
void *mc){
1036
void* mc){
1516
1037
if(r == NULL){
1517
1038
return;
1518
1039
}
1521
1042
timed out */
1522
1043
1523
1044
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1525
1045
return;
1526
1046
}
1527
1047
1572
1092
const char *domain,
1573
1093
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1574
1094
flags,
1575
void *mc){
1095
void* mc){
1576
1096
if(b == NULL){
1577
1097
return;
1578
1098
}
1638
1158
errno = old_errno;
1639
1159
}
1640
1160
1641
__attribute__((nonnull, warn_unused_result))
1642
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
1162
int ret;
1644
int old_errno;
1163
error_t ret_errno;
1645
1164
1646
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
1166
if(s < 0){
1648
old_errno = errno;
1167
ret_errno = errno;
1649
1168
perror_plus("socket");
1650
errno = old_errno;
1169
errno = ret_errno;
1651
1170
return false;
1652
1171
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1172
strcpy(ifr->ifr_name, ifname);
1655
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
1174
if(ret == -1){
1657
1175
if(debug){
1658
old_errno = errno;
1176
ret_errno = errno;
1659
1177
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1178
errno = ret_errno;
1666
1179
}
1667
1180
return false;
1668
1181
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
1182
return true;
1675
1183
}
1676
1184
1677
__attribute__((nonnull, warn_unused_result))
1678
1185
bool good_flags(const char *ifname, const struct ifreq *ifr){
1679
1186
1680
1187
/* Reject the loopback device */
1722
1229
* corresponds to an acceptable network device.
1723
1230
* (This function is passed to scandir(3) as a filter function.)
1724
1231
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
1232
int good_interface(const struct dirent *if_entry){
1727
1233
if(if_entry->d_name[0] == '.'){
1728
1234
return 0;
1746
1252
/*
1747
1253
* This function determines if a network interface is up.
1748
1254
*/
1749
__attribute__((nonnull, warn_unused_result))
1750
1255
bool interface_is_up(const char *interface){
1751
1256
struct ifreq ifr;
1752
1257
if(not get_flags(interface, &ifr)){
1763
1268
/*
1764
1269
* This function determines if a network interface is running
1765
1270
*/
1766
__attribute__((nonnull, warn_unused_result))
1767
1271
bool interface_is_running(const char *interface){
1768
1272
struct ifreq ifr;
1769
1273
if(not get_flags(interface, &ifr)){
1777
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1778
1282
}
1779
1283
1780
__attribute__((nonnull, pure, warn_unused_result))
1781
1284
int notdotentries(const struct dirent *direntry){
1782
1285
/* Skip "." and ".." */
1783
1286
if(direntry->d_name[0] == '.'
1790
1293
}
1791
1294
1792
1295
/* Is this directory entry a runnable program? */
1793
__attribute__((nonnull, warn_unused_result))
1794
1296
int runnable_hook(const struct dirent *direntry){
1795
1297
int ret;
1796
1298
size_t sret;
1804
1306
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1805
1307
"abcdefghijklmnopqrstuvwxyz"
1806
1308
"0123456789"
1807
"_.-");
1309
"_-");
1808
1310
if((direntry->d_name)[sret] != '\0'){
1809
1311
/* Contains non-allowed characters */
1810
1312
if(debug){
1814
1316
return 0;
1815
1317
}
1816
1318
1817
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1321
if(ret < 0){
1322
perror_plus("asprintf");
1323
return 0;
1324
}
1325
1326
ret = stat(fullname, &st);
1818
1327
if(ret == -1){
1819
1328
if(debug){
1820
1329
perror_plus("Could not stat hook");
1844
1353
return 1;
1845
1354
}
1846
1355
1847
__attribute__((nonnull, warn_unused_result))
1848
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1849
1357
mandos_context *mc){
1850
1358
int ret;
1854
1362
1855
1363
while(true){
1856
1364
if(mc->current_server == NULL){
1857
if(debug){
1365
if (debug){
1858
1366
fprintf_plus(stderr, "Wait until first server is found."
1859
1367
" No timeout!\n");
1860
1368
}
1861
1369
ret = avahi_simple_poll_iterate(s, -1);
1862
1370
} else {
1863
if(debug){
1371
if (debug){
1864
1372
fprintf_plus(stderr, "Check current_server if we should run"
1865
1373
" it, or wait\n");
1866
1374
}
1883
1391
- ((intmax_t)waited_time.tv_sec * 1000))
1884
1392
- ((intmax_t)waited_time.tv_nsec / 1000000));
1885
1393
1886
if(debug){
1394
if (debug){
1887
1395
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1888
1396
block_time);
1889
1397
}
1911
1419
ret = avahi_simple_poll_iterate(s, (int)block_time);
1912
1420
}
1913
1421
if(ret != 0){
1914
if(ret > 0 or errno != EINTR){
1422
if (ret > 0 or errno != EINTR){
1915
1423
return (ret != 1) ? ret : 0;
1916
1424
}
1917
1425
}
1918
1426
}
1919
1427
}
1920
1428
1921
__attribute__((nonnull))
1922
void run_network_hooks(const char *mode, const char *interface,
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
bool run_network_hooks(const char *mode, const char *interface,
1923
1482
const float delay){
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1930
if(debug){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1933
}
1934
} else {
1935
perror_plus("open");
1936
}
1937
return;
1938
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1483
struct dirent **direntries;
1484
struct dirent *direntry;
1485
int ret;
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1487
alphasort);
1947
1488
if(numhooks == -1){
1948
perror_plus("scandir");
1949
close(devnull);
1950
return;
1951
}
1952
struct dirent *direntry;
1953
int ret;
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1956
if(debug){
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1958
direntry->d_name);
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
1959
1496
}
1960
pid_t hook_pid = fork();
1961
if(hook_pid == 0){
1962
/* Child */
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1966
perror_plus("Failed to raise privileges");
1967
_exit(EX_NOPERM);
1968
}
1969
/* Set group */
1970
errno = 0;
1971
ret = setgid(0);
1972
if(ret == -1){
1973
perror_plus("setgid");
1974
_exit(EX_NOPERM);
1975
}
1976
/* Reset supplementary groups */
1977
errno = 0;
1978
ret = setgroups(0, NULL);
1979
if(ret == -1){
1980
perror_plus("setgroups");
1981
_exit(EX_NOPERM);
1982
}
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
ret = setenv("DEVICE", interface, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1994
if(ret == -1){
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("MODE", mode, 1);
1999
if(ret == -1){
2000
perror_plus("setenv");
2001
_exit(EX_OSERR);
2002
}
2003
char *delaystring;
2004
ret = asprintf(&delaystring, "%f", (double)delay);
2005
if(ret == -1){
1497
} else {
1498
int devnull = open("/dev/null", O_RDONLY);
1499
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1501
char *fullname = NULL;
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1503
if(ret < 0){
2006
1504
perror_plus("asprintf");
2007
_exit(EX_OSERR);
2008
}
2009
ret = setenv("DELAY", delaystring, 1);
2010
if(ret == -1){
1505
continue;
1506
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1511
pid_t hook_pid = fork();
1512
if(hook_pid == 0){
1513
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1528
dup2(devnull, STDIN_FILENO);
1529
close(devnull);
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1532
if(ret == -1){
1533
perror_plus("setenv");
1534
_exit(EX_OSERR);
1535
}
1536
ret = setenv("DEVICE", interface, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("MODE", mode, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
char *delaystring;
1552
ret = asprintf(&delaystring, "%f", delay);
1553
if(ret == -1){
1554
perror_plus("asprintf");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("DELAY", delaystring, 1);
1558
if(ret == -1){
1559
free(delaystring);
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
2011
1563
free(delaystring);
2012
perror_plus("setenv");
2013
_exit(EX_OSERR);
2014
}
2015
free(delaystring);
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2018
if(ret == -1){
2019
perror_plus("setenv");
2020
_exit(EX_OSERR);
2021
}
2022
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2053
}
2054
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
int status;
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2063
free(direntry);
2064
continue;
2065
}
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2071
free(direntry);
2072
continue;
2073
}
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
2077
WTERMSIG(status));
2078
free(direntry);
2079
continue;
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
2080
1575
} else {
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
continue;
2085
}
2086
}
2087
if(debug){
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
direntry->d_name);
2090
}
2091
free(direntry);
2092
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
2096
} else {
2097
hookdir_fd = -1;
2098
}
2099
close(devnull);
1576
int status;
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1578
perror_plus("waitpid");
1579
free(fullname);
1580
continue;
1581
}
1582
if(WIFEXITED(status)){
1583
if(WEXITSTATUS(status) != 0){
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1587
free(fullname);
1588
continue;
1589
}
1590
} else if(WIFSIGNALED(status)){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1593
WTERMSIG(status));
1594
free(fullname);
1595
continue;
1596
} else {
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1599
free(fullname);
1600
continue;
1601
}
1602
}
1603
free(fullname);
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1607
}
1608
}
1609
close(devnull);
1610
}
1611
return true;
2100
1612
}
2101
1613
2102
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2106
int ret;
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
2107
1620
struct ifreq network;
2108
1621
unsigned int if_index = if_nametoindex(interface);
2109
1622
if(if_index == 0){
2118
1631
}
2119
1632
2120
1633
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2123
if(not get_flags(interface, &network)){
1634
if(not get_flags(interface, &network) and debug){
2124
1635
ret_errno = errno;
2125
1636
fprintf_plus(stderr, "Failed to get flags for interface "
2126
1637
"\"%s\"\n", interface);
2127
errno = old_errno;
2128
1638
return ret_errno;
2129
1639
}
2130
network.ifr_flags |= IFF_UP; /* set flag */
1640
network.ifr_flags |= IFF_UP;
2131
1641
2132
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2133
if(sd == -1){
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
2134
1644
ret_errno = errno;
2135
1645
perror_plus("socket");
2136
1646
errno = old_errno;
2137
1647
return ret_errno;
2138
1648
}
2139
1649
2140
1650
if(quit_now){
2141
ret = close(sd);
2142
if(ret == -1){
2143
perror_plus("close");
2144
}
1651
close(sd);
2145
1652
errno = old_errno;
2146
1653
return EINTR;
2147
1654
}
2151
1658
interface);
2152
1659
}
2153
1660
2154
/* Raise privileges */
2155
ret_errno = raise_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to raise privileges");
2159
}
1661
/* Raise priviliges */
1662
raise_privileges();
2160
1663
2161
1664
#ifdef __linux__
2162
int ret_linux;
2163
bool restore_loglevel = false;
2164
if(ret_errno == 0){
2165
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2166
messages about the network interface to mess up the prompt */
2167
ret_linux = klogctl(8, NULL, 5);
2168
if(ret_linux == -1){
2169
perror_plus("klogctl");
2170
} else {
2171
restore_loglevel = true;
2172
}
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
2173
1672
}
2174
1673
#endif /* __linux__ */
2175
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2176
ioctl_errno = errno;
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
2177
1676
#ifdef __linux__
2178
1677
if(restore_loglevel){
2179
1678
ret_linux = klogctl(7, NULL, 0);
2183
1682
}
2184
1683
#endif /* __linux__ */
2185
1684
2186
/* If raise_privileges() succeeded above */
2187
if(ret_errno == 0){
2188
/* Lower privileges */
2189
ret_errno = lower_privileges();
2190
if(ret_errno != 0){
2191
errno = ret_errno;
2192
perror_plus("Failed to lower privileges");
2193
}
2194
}
1685
/* Lower privileges */
1686
lower_privileges();
2195
1687
2196
1688
/* Close the socket */
2197
ret = close(sd);
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2198
1690
if(ret == -1){
2199
1691
perror_plus("close");
2200
1692
}
2201
1693
2202
1694
if(ret_setflags == -1){
2203
errno = ioctl_errno;
1695
errno = ret_errno;
2204
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2205
1697
errno = old_errno;
2206
return ioctl_errno;
1698
return ret_errno;
2207
1699
}
2208
1700
} else if(debug){
2209
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2212
1704
2213
1705
/* Sleep checking until interface is running.
2214
1706
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
1707
for(int i=0; i < delay * 4; i++){
2216
1708
if(interface_is_running(interface)){
2217
1709
break;
2218
1710
}
2227
1719
return 0;
2228
1720
}
2229
1721
2230
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
2233
1727
struct ifreq network;
2234
1728
unsigned int if_index = if_nametoindex(interface);
2235
1729
if(if_index == 0){
2238
1732
return ENXIO;
2239
1733
}
2240
1734
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2243
1735
if(not get_flags(interface, &network) and debug){
2244
1736
ret_errno = errno;
2245
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2246
1738
"\"%s\"\n", interface);
2247
errno = old_errno;
2248
1739
return ret_errno;
2249
1740
}
2250
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
1742
2252
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2253
if(sd == -1){
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
2254
1745
ret_errno = errno;
2255
1746
perror_plus("socket");
2256
1747
errno = old_errno;
2262
1753
interface);
2263
1754
}
2264
1755
2265
/* Raise privileges */
2266
ret_errno = raise_privileges();
2267
if(ret_errno != 0){
2268
errno = ret_errno;
2269
perror_plus("Failed to raise privileges");
2270
}
2271
2272
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2273
ioctl_errno = errno;
2274
2275
/* If raise_privileges() succeeded above */
2276
if(ret_errno == 0){
2277
/* Lower privileges */
2278
ret_errno = lower_privileges();
2279
if(ret_errno != 0){
2280
errno = ret_errno;
2281
perror_plus("Failed to lower privileges");
2282
}
2283
}
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
2284
1764
2285
1765
/* Close the socket */
2286
int ret = close(sd);
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2287
1767
if(ret == -1){
2288
1768
perror_plus("close");
2289
1769
}
2290
1770
2291
1771
if(ret_setflags == -1){
2292
errno = ioctl_errno;
1772
errno = ret_errno;
2293
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2294
1774
errno = old_errno;
2295
return ioctl_errno;
1775
return ret_errno;
2296
1776
}
2297
1777
} else if(debug){
2298
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2304
1784
}
2305
1785
2306
1786
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
2312
1791
AvahiSServiceBrowser *sb = NULL;
2313
1792
error_t ret_errno;
2314
1793
int ret;
2317
1796
int exitcode = EXIT_SUCCESS;
2318
1797
char *interfaces_to_take_down = NULL;
2319
1798
size_t interfaces_to_take_down_size = 0;
2320
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2321
char old_tempdir[] = "/tmp/mandosXXXXXX";
2322
char *tempdir = NULL;
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1800
bool tempdir_created = false;
2323
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
1802
const char *seckey = PATHDIR "/" SECKEY;
2325
1803
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
2328
1806
2329
1807
bool gnutls_initialized = false;
2330
1808
bool gpgme_initialized = false;
2382
1860
.doc = "Bit length of the prime number used in the"
2383
1861
" Diffie-Hellman key exchange",
2384
1862
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
2390
1863
{ .name = "priority", .key = 130,
2391
1864
.arg = "STRING",
2392
1865
.doc = "GnuTLS priority string for the TLS handshake",
2447
1920
}
2448
1921
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2449
1922
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2453
1923
case 130: /* --priority */
2454
1924
mc.priority = arg;
2455
1925
break;
2495
1965
.args_doc = "",
2496
1966
.doc = "Mandos client -- Get and decrypt"
2497
1967
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
1968
ret = argp_parse(&argp, argc, argv,
1969
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1970
switch(ret){
2501
1971
case 0:
2502
1972
break;
2503
1973
case ENOMEM:
2504
1974
default:
2505
errno = ret_errno;
1975
errno = ret;
2506
1976
perror_plus("argp_parse");
2507
1977
exitcode = EX_OSERR;
2508
1978
goto end;
2511
1981
goto end;
2512
1982
}
2513
1983
}
2514
1984
2515
1985
{
2516
1986
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
1987
<http://bugs.debian.org/633582> */
2518
1988
2519
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2523
perror_plus("Failed to raise privileges");
2524
} else {
1989
/* Re-raise priviliges */
1990
if(raise_privileges() == 0){
2525
1991
struct stat st;
2526
1992
2527
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2541
2007
}
2542
2008
}
2543
2009
}
2544
close(seckey_fd);
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2545
2011
}
2546
2012
}
2547
2013
2548
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2550
2016
if(pubkey_fd == -1){
2562
2028
}
2563
2029
}
2564
2030
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2591
2035
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to lower privileges");
2596
}
2036
lower_privileges();
2597
2037
}
2598
2038
}
2599
2039
2623
2063
goto end;
2624
2064
}
2625
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2626
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2627
}
2628
run_network_hooks("start", interfaces_hooks != NULL ?
2629
interfaces_hooks : "", delay);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
2069
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2072
goto end;
2073
}
2630
2074
}
2631
2075
2632
2076
if(not debug){
2710
2154
2711
2155
/* If no interfaces were specified, make a list */
2712
2156
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2157
struct dirent **direntries;
2714
2158
/* Look for any good interfaces */
2715
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2716
2160
alphasort);
2720
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2721
2165
direntries[i]->d_name);
2722
2166
if(ret_errno != 0){
2723
errno = ret_errno;
2724
2167
perror_plus("argz_add");
2725
free(direntries[i]);
2726
2168
continue;
2727
2169
}
2728
2170
if(debug){
2729
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
2172
direntries[i]->d_name);
2731
2173
}
2732
free(direntries[i]);
2733
2174
}
2734
2175
free(direntries);
2735
2176
} else {
2736
if(ret == 0){
2737
free(direntries);
2738
}
2177
free(direntries);
2739
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2740
2179
exitcode = EXIT_FAILURE;
2741
2180
goto end;
2742
2181
}
2743
2182
}
2744
2183
2745
/* Bring up interfaces which are down, and remove any "none"s */
2184
/* Bring up interfaces which are down */
2746
2185
{
2747
2186
char *interface = NULL;
2748
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2764
2203
break;
2765
2204
}
2766
2205
bool interface_was_up = interface_is_up(interface);
2767
errno = bring_up_interface(interface, delay);
2206
ret = bring_up_interface(interface, delay);
2768
2207
if(not interface_was_up){
2769
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2772
2211
} else {
2773
errno = argz_add(&interfaces_to_take_down,
2774
&interfaces_to_take_down_size,
2775
interface);
2776
if(errno != 0){
2777
perror_plus("argz_add");
2778
}
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2779
2215
}
2780
2216
}
2781
2217
}
2797
2233
goto end;
2798
2234
}
2799
2235
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
2801
2237
if(ret == -1){
2802
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
2239
exitcode = EX_UNAVAILABLE;
2810
2246
goto end;
2811
2247
}
2812
2248
2813
/* Try /run/tmp before /tmp */
2814
tempdir = mkdtemp(run_tempdir);
2815
if(tempdir == NULL and errno == ENOENT){
2816
if(debug){
2817
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2818
run_tempdir, old_tempdir);
2819
}
2820
tempdir = mkdtemp(old_tempdir);
2821
}
2822
if(tempdir == NULL){
2249
if(mkdtemp(tempdir) == NULL){
2823
2250
perror_plus("mkdtemp");
2824
2251
goto end;
2825
2252
}
2253
tempdir_created = true;
2826
2254
2827
2255
if(quit_now){
2828
2256
goto end;
2900
2328
fprintf_plus(stderr, "Retrying in %d seconds\n",
2901
2329
(int)retry_interval);
2902
2330
}
2903
sleep((unsigned int)retry_interval);
2331
sleep((int)retry_interval);
2904
2332
}
2905
2333
2906
if(not quit_now){
2334
if (not quit_now){
2907
2335
exitcode = EXIT_SUCCESS;
2908
2336
}
2909
2337
2925
2353
2926
2354
/* Allocate a new server */
2927
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2356
&config, NULL, NULL, &ret_errno);
2929
2357
2930
2358
/* Free the Avahi configuration data */
2931
2359
avahi_server_config_free(&config);
2934
2362
/* Check if creating the Avahi server object succeeded */
2935
2363
if(mc.server == NULL){
2936
2364
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2365
avahi_strerror(ret_errno));
2938
2366
exitcode = EX_UNAVAILABLE;
2939
2367
goto end;
2940
2368
}
2964
2392
if(debug){
2965
2393
fprintf_plus(stderr, "Starting Avahi loop search\n");
2966
2394
}
2967
2395
2968
2396
ret = avahi_loop_with_timeout(simple_poll,
2969
2397
(int)(retry_interval * 1000), &mc);
2970
2398
if(debug){
2975
2403
end:
2976
2404
2977
2405
if(debug){
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2406
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2985
2407
}
2986
2408
2987
2409
/* Cleanup things */
2998
2420
2999
2421
if(gnutls_initialized){
3000
2422
gnutls_certificate_free_credentials(mc.cred);
2423
gnutls_global_deinit();
3001
2424
gnutls_dh_params_deinit(mc.dh_params);
3002
2425
}
3003
2426
3011
2434
mc.current_server->prev->next = NULL;
3012
2435
while(mc.current_server != NULL){
3013
2436
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
3022
2437
free(mc.current_server);
3023
2438
mc.current_server = next;
3024
2439
}
3025
2440
}
3026
2441
3027
/* Re-raise privileges */
2442
/* Re-raise priviliges */
3028
2443
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to raise privileges");
3033
} else {
3034
3035
/* Run network hooks */
3036
run_network_hooks("stop", interfaces_hooks != NULL ?
3037
interfaces_hooks : "", delay);
3038
3039
/* Take down the network interfaces which were brought up */
3040
{
3041
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
3048
perror_plus("Failed to take down interface");
3049
}
3050
}
3051
if(debug and (interfaces_to_take_down == NULL)){
3052
fprintf_plus(stderr, "No interfaces needed to be taken"
3053
" down\n");
3054
}
3055
}
3056
}
3057
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3061
perror_plus("Failed to lower privileges permanently");
3062
}
2444
raise_privileges();
2445
2446
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2449
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
2460
}
2461
}
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2465
}
2466
}
2467
2468
lower_privileges_permanently();
3063
2469
}
3064
2470
3065
2471
free(interfaces_to_take_down);
3066
2472
free(interfaces_hooks);
3067
2473
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
2474
/* Removes the GPGME temp directory and all files inside */
2475
if(tempdir_created){
3070
2476
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
2477
struct dirent *direntry = NULL;
2478
int numentries = scandir(tempdir, &direntries, notdotentries,
2479
alphasort);
2480
if (numentries > 0){
3084
2481
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3122
/* Removes the GPGME temp directory and all files inside */
3123
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2482
direntry = direntries[i];
2483
char *fullname = NULL;
2484
ret = asprintf(&fullname, "%s/%s", tempdir,
2485
direntry->d_name);
2486
if(ret < 0){
2487
perror_plus("asprintf");
2488
continue;
2489
}
2490
ret = remove(fullname);
2491
if(ret == -1){
2492
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2493
strerror(errno));
2494
}
2495
free(fullname);
2496
}
2497
}
2498
2499
/* need to clean even if 0 because man page doesn't specify */
2500
free(direntries);
2501
if (numentries == -1){
2502
perror_plus("scandir");
2503
}
2504
ret = rmdir(tempdir);
2505
if(ret == -1 and errno != ENOENT){
2506
perror_plus("rmdir");
2507
}
3125
2508
}
3126
2509
3127
2510
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0