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- Committer: Teddy Hogeborn
- Date: 2013-12-15 22:21:28 UTC
- Revision ID: teddy@recompile.se-20131215222128-k6f1wbl6lv4v0kd8
Suppress spurious warnings when needed.
* plugin-runner.c (main): Suppress warning by -Wsign-conversion
generated by FD_SET, FD_CLR and FD_ISSET in
GNU libc before version 2.16.
* plugins.d/mandos-client.c (start_mandos_communication): Suppress
warning by -Wstrict-aliasing generated by IN6_IS_ADDR_LINKLOCAL.
* plugin-runner.c (main): Suppress warning by -Wsign-conversion
generated by FD_SET, FD_CLR and FD_ISSET in
GNU libc before version 2.16.
* plugins.d/mandos-client.c (start_mandos_communication): Suppress
warning by -Wstrict-aliasing generated by IN6_IS_ADDR_LINKLOCAL.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
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,
420
388
if(result == NULL){
421
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
390
} else {
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
427
fprintf_plus(stderr, "Wrong key usage: %s\n",
428
result->wrong_key_usage ? "Yes" : "No");
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
429
395
if(result->file_name != NULL){
430
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
431
397
}
501
467
return plaintext_length;
502
468
}
503
469
504
__attribute__((warn_unused_result, const))
505
static const char *safe_string(const char *str){
506
if(str == NULL)
507
return "(unknown)";
508
return str;
509
}
510
511
__attribute__((warn_unused_result))
512
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
513
471
const char *ret = gnutls_strerror(value);
514
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
515
475
}
516
476
517
477
/* GnuTLS log function callback */
518
__attribute__((nonnull))
519
478
static void debuggnutls(__attribute__((unused)) int level,
520
479
const char* string){
521
480
fprintf_plus(stderr, "GnuTLS: %s", string);
522
481
}
523
482
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
525
483
static int init_gnutls_global(const char *pubkeyfilename,
526
484
const char *seckeyfilename,
527
const char *dhparamsfilename,
528
485
mandos_context *mc){
529
486
int ret;
530
unsigned int uret;
531
487
532
488
if(debug){
533
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
534
490
}
535
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
536
499
if(debug){
537
500
/* "Use a log level over 10 to enable all debugging options."
538
501
* - GnuTLS manual
546
509
if(ret != GNUTLS_E_SUCCESS){
547
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
549
513
return -1;
550
514
}
551
515
576
540
safer_gnutls_strerror(ret));
577
541
goto globalfail;
578
542
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
624
}
625
if(dhparamsfilename == NULL){
626
break;
627
}
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
635
}
636
free(params.data);
637
} while(false);
638
}
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
644
do {
645
int secfile = open(seckeyfilename, O_RDONLY);
646
if(secfile == -1){
647
perror_plus("open");
648
break;
649
}
650
size_t buffer_capacity = 0;
651
while(true){
652
buffer_capacity = incbuffer((char **)&buffer.data,
653
(size_t)buffer.size,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
657
free(buffer.data);
658
buffer.data = NULL;
659
break;
660
}
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
663
BUFFER_SIZE);
664
/* EOF */
665
if(bytes_read == 0){
666
break;
667
}
668
/* check bytes_read for failure */
669
if(bytes_read < 0){
670
perror_plus("read");
671
free(buffer.data);
672
buffer.data = NULL;
673
break;
674
}
675
buffer.size += (unsigned int)bytes_read;
676
}
677
close(secfile);
678
} while(false);
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
682
{
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
687
" structure: %s",
688
safer_gnutls_strerror(ret));
689
free(buffer.data);
690
buffer.data = NULL;
691
} else {
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
697
privkey = NULL;
698
}
699
free(buffer.data);
700
buffer.data = NULL;
701
if(privkey != NULL){
702
/* Use private key to suggest an appropriate
703
sec_param */
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
706
if(debug){
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
710
(sec_param)));
711
}
712
}
713
}
714
}
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
718
if(debug){
719
fprintf_plus(stderr, "Falling back to security parameter"
720
" \"%s\"\n",
721
safe_string(gnutls_sec_param_get_name
722
(sec_param)));
723
}
724
}
725
}
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
727
if(uret != 0){
728
mc->dh_bits = uret;
729
if(debug){
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
mc->dh_bits);
735
}
736
} else {
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
740
(sec_param)),
741
safer_gnutls_strerror(ret));
742
goto globalfail;
743
}
744
} else if(debug){
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
mc->dh_bits);
747
}
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
753
goto globalfail;
754
}
755
}
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
756
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
757
551
758
552
return 0;
760
554
globalfail:
761
555
762
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
763
558
gnutls_dh_params_deinit(mc->dh_params);
764
559
return -1;
765
560
}
766
561
767
__attribute__((nonnull, warn_unused_result))
768
562
static int init_gnutls_session(gnutls_session_t *session,
769
563
mandos_context *mc){
770
564
int ret;
817
611
/* ignore client certificate if any. */
818
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
819
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
820
616
return 0;
821
617
}
822
618
824
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
825
621
__attribute__((unused)) const char *txt){}
826
622
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
832
if(seteuid(0) == -1){
833
ret = errno;
834
}
835
errno = old_errno;
836
return ret;
837
}
838
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
if(ret != 0){
845
errno = old_errno;
846
return ret;
847
}
848
if(setuid(0) == -1){
849
ret = errno;
850
}
851
errno = old_errno;
852
return ret;
853
}
854
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
860
if(seteuid(uid) == -1){
861
ret = errno;
862
}
863
errno = old_errno;
864
return ret;
865
}
866
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
872
if(setuid(uid) == -1){
873
ret = errno;
874
}
875
errno = old_errno;
876
return ret;
877
}
878
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
882
const char *address,
883
AvahiIfIndex if_index){
884
int ret;
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
891
if(debug){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
894
}
895
return false;
896
}
897
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
901
return false;
902
}
903
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
905
if(devnull == -1){
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
return false;
908
}
909
pid_t pid = fork();
910
if(pid == 0){
911
/* Child */
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
914
if(errno != 0){
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
917
} else {
918
/* Set group */
919
errno = 0;
920
ret = setgid(0);
921
if(ret == -1){
922
perror_plus("setgid");
923
_exit(EX_NOPERM);
924
}
925
/* Reset supplementary groups */
926
errno = 0;
927
ret = setgroups(0, NULL);
928
if(ret == -1){
929
perror_plus("setgroups");
930
_exit(EX_NOPERM);
931
}
932
}
933
ret = dup2(devnull, STDIN_FILENO);
934
if(ret == -1){
935
perror_plus("dup2(devnull, STDIN_FILENO)");
936
_exit(EX_OSERR);
937
}
938
ret = close(devnull);
939
if(ret == -1){
940
perror_plus("close");
941
_exit(EX_OSERR);
942
}
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
944
if(ret == -1){
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
_exit(EX_OSERR);
947
}
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
O_RDONLY
950
| O_DIRECTORY
951
| O_PATH
952
| O_CLOEXEC));
953
if(helperdir_fd == -1){
954
perror_plus("open");
955
_exit(EX_UNAVAILABLE);
956
}
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
helper, O_RDONLY));
959
if(helper_fd == -1){
960
perror_plus("openat");
961
close(helperdir_fd);
962
_exit(EX_UNAVAILABLE);
963
}
964
close(helperdir_fd);
965
#ifdef __GNUC__
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
968
#endif
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
972
environ) == -1){
973
#ifdef __GNUC__
974
#pragma GCC diagnostic pop
975
#endif
976
perror_plus("fexecve");
977
_exit(EXIT_FAILURE);
978
}
979
}
980
if(pid == -1){
981
perror_plus("fork");
982
return false;
983
}
984
int status;
985
pid_t pret = -1;
986
errno = 0;
987
do {
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
995
}
996
if(kill(pid, SIGTERM) == -1){
997
perror_plus("kill");
998
}
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1001
" helper program");
1002
}
1003
return false;
1004
}
1005
} while(pret == -1 and errno == EINTR);
1006
if(pret == -1){
1007
perror_plus("waitpid");
1008
return false;
1009
}
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1014
return false;
1015
}
1016
return true;
1017
}
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1021
return false;
1022
}
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1024
return false;
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1032
}
1033
return add_delete_local_route(true, address, if_index);
1034
}
1035
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1039
if(debug){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1041
}
1042
return add_delete_local_route(false, address, if_index);
1043
}
1044
1045
623
/* Called when a Mandos server is found */
1046
__attribute__((nonnull, warn_unused_result))
1047
624
static int start_mandos_communication(const char *ip, in_port_t port,
1048
625
AvahiIfIndex if_index,
1049
626
int af, mandos_context *mc){
1050
627
int ret, tcp_sd = -1;
1051
628
ssize_t sret;
1052
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1053
633
char *buffer = NULL;
1054
634
char *decrypted_buffer = NULL;
1055
635
size_t buffer_length = 0;
1058
638
int retval = -1;
1059
639
gnutls_session_t session;
1060
640
int pf; /* Protocol family */
1061
bool route_added = false;
1062
641
1063
642
errno = 0;
1064
643
1086
665
bool match = false;
1087
666
{
1088
667
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1092
670
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
671
match = true;
1094
672
break;
1123
701
PRIuMAX "\n", ip, (uintmax_t)port);
1124
702
}
1125
703
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1127
705
if(tcp_sd < 0){
1128
706
int e = errno;
1129
707
perror_plus("socket");
1136
714
goto mandos_end;
1137
715
}
1138
716
717
memset(&to, 0, sizeof(to));
1139
718
if(af == AF_INET6){
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
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);
1143
721
} else { /* IPv4 */
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
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);
1147
724
}
1148
725
if(ret < 0 ){
1149
726
int e = errno;
1158
735
goto mandos_end;
1159
736
}
1160
737
if(af == AF_INET6){
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
1164
748
if(if_index == AVAHI_IF_UNSPEC){
1165
749
fprintf_plus(stderr, "An IPv6 link-local address is"
1166
750
" incomplete without a network interface\n");
1168
752
goto mandos_end;
1169
753
}
1170
754
/* Set the network interface number as scope */
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
755
to.in6.sin6_scope_id = (uint32_t)if_index;
1172
756
}
1173
757
} else {
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
758
to.in.sin_port = htons(port);
1175
759
}
1176
760
1177
761
if(quit_now){
1194
778
}
1195
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1196
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1197
if(af == AF_INET6){
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in6),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
} else {
1203
ret = getnameinfo((struct sockaddr *)&to,
1204
sizeof(struct sockaddr_in),
1205
addrstr, sizeof(addrstr), NULL, 0,
1206
NI_NUMERICHOST);
1207
}
1208
if(ret == EAI_SYSTEM){
1209
perror_plus("getnameinfo");
1210
} else if(ret != 0) {
1211
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1212
} else if(strcmp(addrstr, ip) != 0){
1213
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
}
1215
}
1216
1217
if(quit_now){
1218
errno = EINTR;
1219
goto mandos_end;
1220
}
1221
1222
while(true){
1223
if(af == AF_INET6){
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1226
} else {
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1229
}
1230
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1237
&to)->sin6_addr)))
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1248
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1252
*/
1253
if(debug){
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1255
" direct route\n");
1256
}
1257
int e = errno;
1258
route_added = add_local_route(ip, if_index);
1259
if(route_added){
1260
continue;
1261
}
1262
errno = e;
1263
}
1264
if(errno != ECONNREFUSED or debug){
1265
int e = errno;
1266
perror_plus("connect");
1267
errno = e;
1268
}
1269
goto mandos_end;
1270
}
1271
1272
if(quit_now){
1273
errno = EINTR;
1274
goto mandos_end;
1275
}
1276
break;
781
const char *pcret;
782
if(af == AF_INET6){
783
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
784
sizeof(addrstr));
785
} else {
786
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
787
sizeof(addrstr));
788
}
789
if(pcret == NULL){
790
perror_plus("inet_ntop");
791
} else {
792
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
794
}
795
}
796
}
797
798
if(quit_now){
799
errno = EINTR;
800
goto mandos_end;
801
}
802
803
if(af == AF_INET6){
804
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
} else {
806
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
807
}
808
if(ret < 0){
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
int e = errno;
811
perror_plus("connect");
812
errno = e;
813
}
814
goto mandos_end;
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
1277
820
}
1278
821
1279
822
const char *out = mandos_protocol_version;
1433
976
&decrypted_buffer, mc);
1434
977
if(decrypted_buffer_size >= 0){
1435
978
1436
clearerr(stdout);
1437
979
written = 0;
1438
980
while(written < (size_t) decrypted_buffer_size){
1439
981
if(quit_now){
1455
997
}
1456
998
written += (size_t)ret;
1457
999
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
1468
1000
retval = 0;
1469
1001
}
1470
1002
}
1473
1005
1474
1006
mandos_end:
1475
1007
{
1476
if(route_added){
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1479
" interface %d", ip, if_index);
1480
}
1481
}
1482
1008
int e = errno;
1483
1009
free(decrypted_buffer);
1484
1010
free(buffer);
1485
1011
if(tcp_sd >= 0){
1486
ret = close(tcp_sd);
1012
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1487
1013
}
1488
1014
if(ret == -1){
1489
1015
if(e == 0){
1514
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
1515
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1516
1042
flags,
1517
void *mc){
1043
void* mc){
1518
1044
if(r == NULL){
1519
1045
return;
1520
1046
}
1523
1049
timed out */
1524
1050
1525
1051
if(quit_now){
1526
avahi_s_service_resolver_free(r);
1527
1052
return;
1528
1053
}
1529
1054
1574
1099
const char *domain,
1575
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1576
1101
flags,
1577
void *mc){
1102
void* mc){
1578
1103
if(b == NULL){
1579
1104
return;
1580
1105
}
1640
1165
errno = old_errno;
1641
1166
}
1642
1167
1643
__attribute__((nonnull, warn_unused_result))
1644
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1645
1169
int ret;
1646
int old_errno;
1170
error_t ret_errno;
1647
1171
1648
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1649
1173
if(s < 0){
1650
old_errno = errno;
1174
ret_errno = errno;
1651
1175
perror_plus("socket");
1652
errno = old_errno;
1176
errno = ret_errno;
1653
1177
return false;
1654
1178
}
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1179
strcpy(ifr->ifr_name, ifname);
1657
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1658
1181
if(ret == -1){
1659
1182
if(debug){
1660
old_errno = errno;
1183
ret_errno = errno;
1661
1184
perror_plus("ioctl SIOCGIFFLAGS");
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1185
errno = ret_errno;
1668
1186
}
1669
1187
return false;
1670
1188
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1676
1189
return true;
1677
1190
}
1678
1191
1679
__attribute__((nonnull, warn_unused_result))
1680
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1681
1193
1682
1194
/* Reject the loopback device */
1724
1236
* corresponds to an acceptable network device.
1725
1237
* (This function is passed to scandir(3) as a filter function.)
1726
1238
*/
1727
__attribute__((nonnull, warn_unused_result))
1728
1239
int good_interface(const struct dirent *if_entry){
1729
1240
if(if_entry->d_name[0] == '.'){
1730
1241
return 0;
1748
1259
/*
1749
1260
* This function determines if a network interface is up.
1750
1261
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
1262
bool interface_is_up(const char *interface){
1753
1263
struct ifreq ifr;
1754
1264
if(not get_flags(interface, &ifr)){
1765
1275
/*
1766
1276
* This function determines if a network interface is running
1767
1277
*/
1768
__attribute__((nonnull, warn_unused_result))
1769
1278
bool interface_is_running(const char *interface){
1770
1279
struct ifreq ifr;
1771
1280
if(not get_flags(interface, &ifr)){
1779
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1780
1289
}
1781
1290
1782
__attribute__((nonnull, pure, warn_unused_result))
1783
1291
int notdotentries(const struct dirent *direntry){
1784
1292
/* Skip "." and ".." */
1785
1293
if(direntry->d_name[0] == '.'
1792
1300
}
1793
1301
1794
1302
/* Is this directory entry a runnable program? */
1795
__attribute__((nonnull, warn_unused_result))
1796
1303
int runnable_hook(const struct dirent *direntry){
1797
1304
int ret;
1798
1305
size_t sret;
1806
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1807
1314
"abcdefghijklmnopqrstuvwxyz"
1808
1315
"0123456789"
1809
"_.-");
1316
"_-");
1810
1317
if((direntry->d_name)[sret] != '\0'){
1811
1318
/* Contains non-allowed characters */
1812
1319
if(debug){
1816
1323
return 0;
1817
1324
}
1818
1325
1819
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1820
1334
if(ret == -1){
1821
1335
if(debug){
1822
1336
perror_plus("Could not stat hook");
1846
1360
return 1;
1847
1361
}
1848
1362
1849
__attribute__((nonnull, warn_unused_result))
1850
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1851
1364
mandos_context *mc){
1852
1365
int ret;
1856
1369
1857
1370
while(true){
1858
1371
if(mc->current_server == NULL){
1859
if(debug){
1372
if (debug){
1860
1373
fprintf_plus(stderr, "Wait until first server is found."
1861
1374
" No timeout!\n");
1862
1375
}
1863
1376
ret = avahi_simple_poll_iterate(s, -1);
1864
1377
} else {
1865
if(debug){
1378
if (debug){
1866
1379
fprintf_plus(stderr, "Check current_server if we should run"
1867
1380
" it, or wait\n");
1868
1381
}
1885
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1886
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1887
1400
1888
if(debug){
1401
if (debug){
1889
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1890
1403
block_time);
1891
1404
}
1913
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1914
1427
}
1915
1428
if(ret != 0){
1916
if(ret > 0 or errno != EINTR){
1429
if (ret > 0 or errno != EINTR){
1917
1430
return (ret != 1) ? ret : 0;
1918
1431
}
1919
1432
}
1920
1433
}
1921
1434
}
1922
1435
1923
__attribute__((nonnull))
1924
void run_network_hooks(const char *mode, const char *interface,
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1925
1489
const float delay){
1926
struct dirent **direntries = NULL;
1927
if(hookdir_fd == -1){
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1929
| O_CLOEXEC);
1930
if(hookdir_fd == -1){
1931
if(errno == ENOENT){
1932
if(debug){
1933
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1934
" found\n", hookdir);
1935
}
1936
} else {
1937
perror_plus("open");
1938
}
1939
return;
1940
}
1941
}
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
runnable_hook, alphasort);
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1949
1495
if(numhooks == -1){
1950
perror_plus("scandir");
1951
close(devnull);
1952
return;
1953
}
1954
struct dirent *direntry;
1955
int ret;
1956
for(int i = 0; i < numhooks; i++){
1957
direntry = direntries[i];
1958
if(debug){
1959
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1960
direntry->d_name);
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1961
1503
}
1962
pid_t hook_pid = fork();
1963
if(hook_pid == 0){
1964
/* Child */
1965
/* Raise privileges */
1966
errno = raise_privileges_permanently();
1967
if(errno != 0){
1968
perror_plus("Failed to raise privileges");
1969
_exit(EX_NOPERM);
1970
}
1971
/* Set group */
1972
errno = 0;
1973
ret = setgid(0);
1974
if(ret == -1){
1975
perror_plus("setgid");
1976
_exit(EX_NOPERM);
1977
}
1978
/* Reset supplementary groups */
1979
errno = 0;
1980
ret = setgroups(0, NULL);
1981
if(ret == -1){
1982
perror_plus("setgroups");
1983
_exit(EX_NOPERM);
1984
}
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1986
if(ret == -1){
1987
perror_plus("setenv");
1988
_exit(EX_OSERR);
1989
}
1990
ret = setenv("DEVICE", interface, 1);
1991
if(ret == -1){
1992
perror_plus("setenv");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1996
if(ret == -1){
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
ret = setenv("MODE", mode, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
char *delaystring;
2006
ret = asprintf(&delaystring, "%f", (double)delay);
2007
if(ret == -1){
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
2008
1511
perror_plus("asprintf");
2009
_exit(EX_OSERR);
2010
}
2011
ret = setenv("DELAY", delaystring, 1);
2012
if(ret == -1){
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
2013
1570
free(delaystring);
2014
perror_plus("setenv");
2015
_exit(EX_OSERR);
2016
}
2017
free(delaystring);
2018
if(connect_to != NULL){
2019
ret = setenv("CONNECT", connect_to, 1);
2020
if(ret == -1){
2021
perror_plus("setenv");
2022
_exit(EX_OSERR);
2023
}
2024
}
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2026
direntry->d_name,
2027
O_RDONLY));
2028
if(hook_fd == -1){
2029
perror_plus("openat");
2030
_exit(EXIT_FAILURE);
2031
}
2032
if(close(hookdir_fd) == -1){
2033
perror_plus("close");
2034
_exit(EXIT_FAILURE);
2035
}
2036
ret = dup2(devnull, STDIN_FILENO);
2037
if(ret == -1){
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
_exit(EX_OSERR);
2040
}
2041
ret = close(devnull);
2042
if(ret == -1){
2043
perror_plus("close");
2044
_exit(EX_OSERR);
2045
}
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2047
if(ret == -1){
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
_exit(EX_OSERR);
2050
}
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2052
environ) == -1){
2053
perror_plus("fexecve");
2054
_exit(EXIT_FAILURE);
2055
}
2056
} else {
2057
if(hook_pid == -1){
2058
perror_plus("fork");
2059
free(direntry);
2060
continue;
2061
}
2062
int status;
2063
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2064
perror_plus("waitpid");
2065
free(direntry);
2066
continue;
2067
}
2068
if(WIFEXITED(status)){
2069
if(WEXITSTATUS(status) != 0){
2070
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2071
" with status %d\n", direntry->d_name,
2072
WEXITSTATUS(status));
2073
free(direntry);
2074
continue;
2075
}
2076
} else if(WIFSIGNALED(status)){
2077
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2078
" signal %d\n", direntry->d_name,
2079
WTERMSIG(status));
2080
free(direntry);
2081
continue;
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
2082
1582
} else {
2083
fprintf_plus(stderr, "Warning: network hook \"%s\""
2084
" crashed\n", direntry->d_name);
2085
free(direntry);
2086
continue;
2087
}
2088
}
2089
if(debug){
2090
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2091
direntry->d_name);
2092
}
2093
free(direntry);
2094
}
2095
free(direntries);
2096
if(close(hookdir_fd) == -1){
2097
perror_plus("close");
2098
} else {
2099
hookdir_fd = -1;
2100
}
2101
close(devnull);
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
2102
1619
}
2103
1620
2104
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
2108
int ret;
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
2109
1627
struct ifreq network;
2110
1628
unsigned int if_index = if_nametoindex(interface);
2111
1629
if(if_index == 0){
2120
1638
}
2121
1639
2122
1640
if(not interface_is_up(interface)){
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
2125
if(not get_flags(interface, &network)){
1641
if(not get_flags(interface, &network) and debug){
2126
1642
ret_errno = errno;
2127
1643
fprintf_plus(stderr, "Failed to get flags for interface "
2128
1644
"\"%s\"\n", interface);
2129
errno = old_errno;
2130
1645
return ret_errno;
2131
1646
}
2132
network.ifr_flags |= IFF_UP; /* set flag */
1647
network.ifr_flags |= IFF_UP;
2133
1648
2134
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2135
if(sd == -1){
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
2136
1651
ret_errno = errno;
2137
1652
perror_plus("socket");
2138
1653
errno = old_errno;
2139
1654
return ret_errno;
2140
1655
}
2141
1656
2142
1657
if(quit_now){
2143
ret = close(sd);
2144
if(ret == -1){
2145
perror_plus("close");
2146
}
1658
close(sd);
2147
1659
errno = old_errno;
2148
1660
return EINTR;
2149
1661
}
2153
1665
interface);
2154
1666
}
2155
1667
2156
/* Raise privileges */
2157
ret_errno = raise_privileges();
2158
if(ret_errno != 0){
2159
errno = ret_errno;
2160
perror_plus("Failed to raise privileges");
2161
}
1668
/* Raise priviliges */
1669
raise_privileges();
2162
1670
2163
1671
#ifdef __linux__
2164
int ret_linux;
2165
bool restore_loglevel = false;
2166
if(ret_errno == 0){
2167
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2168
messages about the network interface to mess up the prompt */
2169
ret_linux = klogctl(8, NULL, 5);
2170
if(ret_linux == -1){
2171
perror_plus("klogctl");
2172
} else {
2173
restore_loglevel = true;
2174
}
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
2175
1679
}
2176
1680
#endif /* __linux__ */
2177
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2178
ioctl_errno = errno;
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
2179
1683
#ifdef __linux__
2180
1684
if(restore_loglevel){
2181
1685
ret_linux = klogctl(7, NULL, 0);
2185
1689
}
2186
1690
#endif /* __linux__ */
2187
1691
2188
/* If raise_privileges() succeeded above */
2189
if(ret_errno == 0){
2190
/* Lower privileges */
2191
ret_errno = lower_privileges();
2192
if(ret_errno != 0){
2193
errno = ret_errno;
2194
perror_plus("Failed to lower privileges");
2195
}
2196
}
1692
/* Lower privileges */
1693
lower_privileges();
2197
1694
2198
1695
/* Close the socket */
2199
ret = close(sd);
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2200
1697
if(ret == -1){
2201
1698
perror_plus("close");
2202
1699
}
2203
1700
2204
1701
if(ret_setflags == -1){
2205
errno = ioctl_errno;
1702
errno = ret_errno;
2206
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2207
1704
errno = old_errno;
2208
return ioctl_errno;
1705
return ret_errno;
2209
1706
}
2210
1707
} else if(debug){
2211
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2214
1711
2215
1712
/* Sleep checking until interface is running.
2216
1713
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
1714
for(int i=0; i < delay * 4; i++){
2218
1715
if(interface_is_running(interface)){
2219
1716
break;
2220
1717
}
2229
1726
return 0;
2230
1727
}
2231
1728
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
2235
1734
struct ifreq network;
2236
1735
unsigned int if_index = if_nametoindex(interface);
2237
1736
if(if_index == 0){
2240
1739
return ENXIO;
2241
1740
}
2242
1741
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
1742
if(not get_flags(interface, &network) and debug){
2246
1743
ret_errno = errno;
2247
1744
fprintf_plus(stderr, "Failed to get flags for interface "
2248
1745
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
1746
return ret_errno;
2251
1747
}
2252
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2253
1749
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
2256
1752
ret_errno = errno;
2257
1753
perror_plus("socket");
2258
1754
errno = old_errno;
2264
1760
interface);
2265
1761
}
2266
1762
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2269
if(ret_errno != 0){
2270
errno = ret_errno;
2271
perror_plus("Failed to raise privileges");
2272
}
2273
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2276
2277
/* If raise_privileges() succeeded above */
2278
if(ret_errno == 0){
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("Failed to lower privileges");
2284
}
2285
}
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
2286
1771
2287
1772
/* Close the socket */
2288
int ret = close(sd);
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2289
1774
if(ret == -1){
2290
1775
perror_plus("close");
2291
1776
}
2292
1777
2293
1778
if(ret_setflags == -1){
2294
errno = ioctl_errno;
1779
errno = ret_errno;
2295
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2296
1781
errno = old_errno;
2297
return ioctl_errno;
1782
return ret_errno;
2298
1783
}
2299
1784
} else if(debug){
2300
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2306
1791
}
2307
1792
2308
1793
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
2314
1798
AvahiSServiceBrowser *sb = NULL;
2315
1799
error_t ret_errno;
2316
1800
int ret;
2319
1803
int exitcode = EXIT_SUCCESS;
2320
1804
char *interfaces_to_take_down = NULL;
2321
1805
size_t interfaces_to_take_down_size = 0;
2322
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2323
char old_tempdir[] = "/tmp/mandosXXXXXX";
2324
char *tempdir = NULL;
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1807
bool tempdir_created = false;
2325
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2326
1809
const char *seckey = PATHDIR "/" SECKEY;
2327
1810
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
2330
1813
2331
1814
bool gnutls_initialized = false;
2332
1815
bool gpgme_initialized = false;
2384
1867
.doc = "Bit length of the prime number used in the"
2385
1868
" Diffie-Hellman key exchange",
2386
1869
.group = 2 },
2387
{ .name = "dh-params", .key = 134,
2388
.arg = "FILE",
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2391
.group = 2 },
2392
1870
{ .name = "priority", .key = 130,
2393
1871
.arg = "STRING",
2394
1872
.doc = "GnuTLS priority string for the TLS handshake",
2449
1927
}
2450
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2451
1929
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
2455
1930
case 130: /* --priority */
2456
1931
mc.priority = arg;
2457
1932
break;
2497
1972
.args_doc = "",
2498
1973
.doc = "Mandos client -- Get and decrypt"
2499
1974
" passwords from a Mandos server" };
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
2503
1978
case 0:
2504
1979
break;
2505
1980
case ENOMEM:
2506
1981
default:
2507
errno = ret_errno;
1982
errno = ret;
2508
1983
perror_plus("argp_parse");
2509
1984
exitcode = EX_OSERR;
2510
1985
goto end;
2513
1988
goto end;
2514
1989
}
2515
1990
}
2516
1991
2517
1992
{
2518
1993
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
1994
<http://bugs.debian.org/633582> */
2520
1995
2521
/* Re-raise privileges */
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2525
perror_plus("Failed to raise privileges");
2526
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2527
1998
struct stat st;
2528
1999
2529
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2543
2014
}
2544
2015
}
2545
2016
}
2546
close(seckey_fd);
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2547
2018
}
2548
2019
}
2549
2020
2550
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2551
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2552
2023
if(pubkey_fd == -1){
2564
2035
}
2565
2036
}
2566
2037
}
2567
close(pubkey_fd);
2568
}
2569
}
2570
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2576
} else {
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2578
if(ret == -1){
2579
perror_plus("fstat");
2580
} else {
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2584
if(ret == -1){
2585
perror_plus("fchown");
2586
}
2587
}
2588
}
2589
close(dhparams_fd);
2590
}
2591
}
2592
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2593
2042
/* Lower privileges */
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2597
perror_plus("Failed to lower privileges");
2598
}
2043
lower_privileges();
2599
2044
}
2600
2045
}
2601
2046
2625
2070
goto end;
2626
2071
}
2627
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2628
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2629
}
2630
run_network_hooks("start", interfaces_hooks != NULL ?
2631
interfaces_hooks : "", delay);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2632
2081
}
2633
2082
2634
2083
if(not debug){
2712
2161
2713
2162
/* If no interfaces were specified, make a list */
2714
2163
if(mc.interfaces == NULL){
2715
struct dirent **direntries = NULL;
2164
struct dirent **direntries;
2716
2165
/* Look for any good interfaces */
2717
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2718
2167
alphasort);
2722
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2723
2172
direntries[i]->d_name);
2724
2173
if(ret_errno != 0){
2725
errno = ret_errno;
2726
2174
perror_plus("argz_add");
2727
free(direntries[i]);
2728
2175
continue;
2729
2176
}
2730
2177
if(debug){
2731
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2732
2179
direntries[i]->d_name);
2733
2180
}
2734
free(direntries[i]);
2735
2181
}
2736
2182
free(direntries);
2737
2183
} else {
2738
if(ret == 0){
2739
free(direntries);
2740
}
2184
free(direntries);
2741
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2742
2186
exitcode = EXIT_FAILURE;
2743
2187
goto end;
2766
2210
break;
2767
2211
}
2768
2212
bool interface_was_up = interface_is_up(interface);
2769
errno = bring_up_interface(interface, delay);
2213
ret = bring_up_interface(interface, delay);
2770
2214
if(not interface_was_up){
2771
if(errno != 0){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2774
2218
} else {
2775
errno = argz_add(&interfaces_to_take_down,
2776
&interfaces_to_take_down_size,
2777
interface);
2778
if(errno != 0){
2779
perror_plus("argz_add");
2780
}
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2781
2222
}
2782
2223
}
2783
2224
}
2799
2240
goto end;
2800
2241
}
2801
2242
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
2803
2244
if(ret == -1){
2804
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
2805
2246
exitcode = EX_UNAVAILABLE;
2812
2253
goto end;
2813
2254
}
2814
2255
2815
/* Try /run/tmp before /tmp */
2816
tempdir = mkdtemp(run_tempdir);
2817
if(tempdir == NULL and errno == ENOENT){
2818
if(debug){
2819
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2820
run_tempdir, old_tempdir);
2821
}
2822
tempdir = mkdtemp(old_tempdir);
2823
}
2824
if(tempdir == NULL){
2256
if(mkdtemp(tempdir) == NULL){
2825
2257
perror_plus("mkdtemp");
2826
2258
goto end;
2827
2259
}
2260
tempdir_created = true;
2828
2261
2829
2262
if(quit_now){
2830
2263
goto end;
2905
2338
sleep((unsigned int)retry_interval);
2906
2339
}
2907
2340
2908
if(not quit_now){
2341
if (not quit_now){
2909
2342
exitcode = EXIT_SUCCESS;
2910
2343
}
2911
2344
2927
2360
2928
2361
/* Allocate a new server */
2929
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
2363
&config, NULL, NULL, &ret_errno);
2931
2364
2932
2365
/* Free the Avahi configuration data */
2933
2366
avahi_server_config_free(&config);
2936
2369
/* Check if creating the Avahi server object succeeded */
2937
2370
if(mc.server == NULL){
2938
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
2372
avahi_strerror(ret_errno));
2940
2373
exitcode = EX_UNAVAILABLE;
2941
2374
goto end;
2942
2375
}
2966
2399
if(debug){
2967
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2968
2401
}
2969
2402
2970
2403
ret = avahi_loop_with_timeout(simple_poll,
2971
2404
(int)(retry_interval * 1000), &mc);
2972
2405
if(debug){
2977
2410
end:
2978
2411
2979
2412
if(debug){
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2987
2414
}
2988
2415
2989
2416
/* Cleanup things */
3000
2427
3001
2428
if(gnutls_initialized){
3002
2429
gnutls_certificate_free_credentials(mc.cred);
2430
gnutls_global_deinit();
3003
2431
gnutls_dh_params_deinit(mc.dh_params);
3004
2432
}
3005
2433
3013
2441
mc.current_server->prev->next = NULL;
3014
2442
while(mc.current_server != NULL){
3015
2443
server *next = mc.current_server->next;
3016
#ifdef __GNUC__
3017
#pragma GCC diagnostic push
3018
#pragma GCC diagnostic ignored "-Wcast-qual"
3019
#endif
3020
free((char *)(mc.current_server->ip));
3021
#ifdef __GNUC__
3022
#pragma GCC diagnostic pop
3023
#endif
3024
2444
free(mc.current_server);
3025
2445
mc.current_server = next;
3026
2446
}
3027
2447
}
3028
2448
3029
/* Re-raise privileges */
2449
/* Re-raise priviliges */
3030
2450
{
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to raise privileges");
3035
} else {
3036
3037
/* Run network hooks */
3038
run_network_hooks("stop", interfaces_hooks != NULL ?
3039
interfaces_hooks : "", delay);
3040
3041
/* Take down the network interfaces which were brought up */
3042
{
3043
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to take down interface");
3051
}
3052
}
3053
if(debug and (interfaces_to_take_down == NULL)){
3054
fprintf_plus(stderr, "No interfaces needed to be taken"
3055
" down\n");
3056
}
3057
}
3058
}
3059
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
3063
perror_plus("Failed to lower privileges permanently");
3064
}
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
2467
}
2468
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2472
}
2473
}
2474
2475
lower_privileges_permanently();
3065
2476
}
3066
2477
3067
2478
free(interfaces_to_take_down);
3068
2479
free(interfaces_hooks);
3069
2480
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
2481
/* Removes the GPGME temp directory and all files inside */
2482
if(tempdir_created){
3072
2483
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
3086
2488
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
3124
/* Removes the GPGME temp directory and all files inside */
3125
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
2489
direntry = direntries[i];
2490
char *fullname = NULL;
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
direntry->d_name);
2493
if(ret < 0){
2494
perror_plus("asprintf");
2495
continue;
2496
}
2497
ret = remove(fullname);
2498
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2501
}
2502
free(fullname);
2503
}
2504
}
2505
2506
/* need to clean even if 0 because man page doesn't specify */
2507
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
2510
}
2511
ret = rmdir(tempdir);
2512
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
2514
}
3127
2515
}
3128
2516
3129
2517
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0