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- Committer: Teddy Hogeborn
- Date: 2012-06-16 23:39:10 UTC
- Revision ID: teddy@recompile.se-20120616233910-jxxxriq608qa6o8z
* plugins.d/mandos-client (mandos_context): New "interfaces" and
"interfaces_size" members.
(main): Removed "interfaces" and "interfaces_size" variabled; all
users changed.
"interfaces_size" members.
(main): Removed "interfaces" and "interfaces_size" variabled; all
users changed.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 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
if(params.data == NULL){
617
dhparamsfilename = NULL;
618
}
619
if(dhparamsfilename == NULL){
620
break;
621
}
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
629
}
630
free(params.data);
631
} while(false);
632
}
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
do {
639
int secfile = open(seckeyfilename, O_RDONLY);
640
if(secfile == -1){
641
perror_plus("open");
642
break;
643
}
644
size_t buffer_capacity = 0;
645
while(true){
646
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer.size,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
651
free(buffer.data);
652
buffer.data = NULL;
653
break;
654
}
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
657
BUFFER_SIZE);
658
/* EOF */
659
if(bytes_read == 0){
660
break;
661
}
662
/* check bytes_read for failure */
663
if(bytes_read < 0){
664
perror_plus("read");
665
free(buffer.data);
666
buffer.data = NULL;
667
break;
668
}
669
buffer.size += (unsigned int)bytes_read;
670
}
671
close(secfile);
672
} while(false);
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
676
{
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
" structure: %s",
682
safer_gnutls_strerror(ret));
683
free(buffer.data);
684
buffer.data = NULL;
685
} else {
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
691
privkey = NULL;
692
}
693
free(buffer.data);
694
buffer.data = NULL;
695
if(privkey != NULL){
696
/* Use private key to suggest an appropriate
697
sec_param */
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
700
if(debug){
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
704
(sec_param)));
705
}
706
}
707
}
708
}
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
if(debug){
713
fprintf_plus(stderr, "Falling back to security parameter"
714
" \"%s\"\n",
715
safe_string(gnutls_sec_param_get_name
716
(sec_param)));
717
}
718
}
719
}
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
if(uret != 0){
722
mc->dh_bits = uret;
723
if(debug){
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
mc->dh_bits);
729
}
730
} else {
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
734
(sec_param)),
735
safer_gnutls_strerror(ret));
736
goto globalfail;
737
}
738
} else if(debug){
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
mc->dh_bits);
741
}
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
747
goto globalfail;
748
}
749
}
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
750
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
751
551
752
552
return 0;
754
554
globalfail:
755
555
756
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
757
558
gnutls_dh_params_deinit(mc->dh_params);
758
559
return -1;
759
560
}
760
561
761
__attribute__((nonnull, warn_unused_result))
762
562
static int init_gnutls_session(gnutls_session_t *session,
763
563
mandos_context *mc){
764
564
int ret;
811
611
/* ignore client certificate if any. */
812
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
813
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
814
616
return 0;
815
617
}
816
618
818
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
819
621
__attribute__((unused)) const char *txt){}
820
622
821
/* Set effective uid to 0, return errno */
822
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
826
if(seteuid(0) == -1){
827
ret = errno;
828
}
829
errno = old_errno;
830
return ret;
831
}
832
833
/* Set effective and real user ID to 0. Return errno. */
834
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
839
errno = old_errno;
840
return ret;
841
}
842
if(setuid(0) == -1){
843
ret = errno;
844
}
845
errno = old_errno;
846
return ret;
847
}
848
849
/* Set effective user ID to unprivileged saved user ID */
850
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
854
if(seteuid(uid) == -1){
855
ret = errno;
856
}
857
errno = old_errno;
858
return ret;
859
}
860
861
/* Lower privileges permanently */
862
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
866
if(setuid(uid) == -1){
867
ret = errno;
868
}
869
errno = old_errno;
870
return ret;
871
}
872
873
/* Helper function to add_local_route() and delete_local_route() */
874
__attribute__((nonnull, warn_unused_result))
875
static bool add_delete_local_route(const bool add,
876
const char *address,
877
AvahiIfIndex if_index){
878
int ret;
879
char helper[] = "mandos-client-iprouteadddel";
880
char add_arg[] = "add";
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
884
if(pluginhelperdir == NULL){
885
if(debug){
886
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
887
" variable not set; cannot run helper\n");
888
}
889
return false;
890
}
891
892
char interface[IF_NAMESIZE];
893
if(if_indextoname((unsigned int)if_index, interface) == NULL){
894
perror_plus("if_indextoname");
895
return false;
896
}
897
898
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
if(devnull == -1){
900
perror_plus("open(\"/dev/null\", O_RDONLY)");
901
return false;
902
}
903
pid_t pid = fork();
904
if(pid == 0){
905
/* Child */
906
/* Raise privileges */
907
errno = raise_privileges_permanently();
908
if(errno != 0){
909
perror_plus("Failed to raise privileges");
910
/* _exit(EX_NOPERM); */
911
} else {
912
/* Set group */
913
errno = 0;
914
ret = setgid(0);
915
if(ret == -1){
916
perror_plus("setgid");
917
_exit(EX_NOPERM);
918
}
919
/* Reset supplementary groups */
920
errno = 0;
921
ret = setgroups(0, NULL);
922
if(ret == -1){
923
perror_plus("setgroups");
924
_exit(EX_NOPERM);
925
}
926
}
927
ret = dup2(devnull, STDIN_FILENO);
928
if(ret == -1){
929
perror_plus("dup2(devnull, STDIN_FILENO)");
930
_exit(EX_OSERR);
931
}
932
ret = close(devnull);
933
if(ret == -1){
934
perror_plus("close");
935
_exit(EX_OSERR);
936
}
937
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
if(ret == -1){
939
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
_exit(EX_OSERR);
941
}
942
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
943
O_RDONLY
944
| O_DIRECTORY
945
| O_PATH
946
| O_CLOEXEC));
947
if(helperdir_fd == -1){
948
perror_plus("open");
949
_exit(EX_UNAVAILABLE);
950
}
951
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
helper, O_RDONLY));
953
if(helper_fd == -1){
954
perror_plus("openat");
955
close(helperdir_fd);
956
_exit(EX_UNAVAILABLE);
957
}
958
close(helperdir_fd);
959
#ifdef __GNUC__
960
#pragma GCC diagnostic push
961
#pragma GCC diagnostic ignored "-Wcast-qual"
962
#endif
963
if(fexecve(helper_fd, (char *const [])
964
{ helper, add ? add_arg : delete_arg, (char *)address,
965
interface, debug ? debug_flag : NULL, NULL },
966
environ) == -1){
967
#ifdef __GNUC__
968
#pragma GCC diagnostic pop
969
#endif
970
perror_plus("fexecve");
971
_exit(EXIT_FAILURE);
972
}
973
}
974
if(pid == -1){
975
perror_plus("fork");
976
return false;
977
}
978
int status;
979
pid_t pret = -1;
980
errno = 0;
981
do {
982
pret = waitpid(pid, &status, 0);
983
if(pret == -1 and errno == EINTR and quit_now){
984
int errno_raising = 0;
985
if((errno = raise_privileges()) != 0){
986
errno_raising = errno;
987
perror_plus("Failed to raise privileges in order to"
988
" kill helper program");
989
}
990
if(kill(pid, SIGTERM) == -1){
991
perror_plus("kill");
992
}
993
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
994
perror_plus("Failed to lower privileges after killing"
995
" helper program");
996
}
997
return false;
998
}
999
} while(pret == -1 and errno == EINTR);
1000
if(pret == -1){
1001
perror_plus("waitpid");
1002
return false;
1003
}
1004
if(WIFEXITED(status)){
1005
if(WEXITSTATUS(status) != 0){
1006
fprintf_plus(stderr, "Error: iprouteadddel exited"
1007
" with status %d\n", WEXITSTATUS(status));
1008
return false;
1009
}
1010
return true;
1011
}
1012
if(WIFSIGNALED(status)){
1013
fprintf_plus(stderr, "Error: iprouteadddel died by"
1014
" signal %d\n", WTERMSIG(status));
1015
return false;
1016
}
1017
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
return false;
1019
}
1020
1021
__attribute__((nonnull, warn_unused_result))
1022
static bool add_local_route(const char *address,
1023
AvahiIfIndex if_index){
1024
if(debug){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
}
1027
return add_delete_local_route(true, address, if_index);
1028
}
1029
1030
__attribute__((nonnull, warn_unused_result))
1031
static bool delete_local_route(const char *address,
1032
AvahiIfIndex if_index){
1033
if(debug){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
}
1036
return add_delete_local_route(false, address, if_index);
1037
}
1038
1039
623
/* Called when a Mandos server is found */
1040
__attribute__((nonnull, warn_unused_result))
1041
624
static int start_mandos_communication(const char *ip, in_port_t port,
1042
625
AvahiIfIndex if_index,
1043
626
int af, mandos_context *mc){
1044
627
int ret, tcp_sd = -1;
1045
628
ssize_t sret;
1046
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1047
633
char *buffer = NULL;
1048
634
char *decrypted_buffer = NULL;
1049
635
size_t buffer_length = 0;
1052
638
int retval = -1;
1053
639
gnutls_session_t session;
1054
640
int pf; /* Protocol family */
1055
bool route_added = false;
1056
641
1057
642
errno = 0;
1058
643
1074
659
return -1;
1075
660
}
1076
661
1077
/* If the interface is specified and we have a list of interfaces */
1078
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1079
/* Check if the interface is one of the interfaces we are using */
1080
bool match = false;
1081
{
1082
char *interface = NULL;
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
662
ret = init_gnutls_session(&session, mc);
1111
663
if(ret != 0){
1112
664
return -1;
1117
669
PRIuMAX "\n", ip, (uintmax_t)port);
1118
670
}
1119
671
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
673
if(tcp_sd < 0){
1122
674
int e = errno;
1123
675
perror_plus("socket");
1130
682
goto mandos_end;
1131
683
}
1132
684
685
memset(&to, 0, sizeof(to));
1133
686
if(af == AF_INET6){
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1137
689
} else { /* IPv4 */
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
1141
692
}
1142
693
if(ret < 0 ){
1143
694
int e = errno;
1152
703
goto mandos_end;
1153
704
}
1154
705
if(af == AF_INET6){
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
1158
710
if(if_index == AVAHI_IF_UNSPEC){
1159
711
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
712
" incomplete without a network interface\n");
1162
714
goto mandos_end;
1163
715
}
1164
716
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
718
}
1167
719
} else {
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1169
723
}
1170
724
1171
725
if(quit_now){
1188
742
}
1189
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
745
const char *pcret;
746
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
749
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
752
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
759
}
760
}
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
}
772
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
1271
784
}
1272
785
1273
786
const char *out = mandos_protocol_version;
1427
940
&decrypted_buffer, mc);
1428
941
if(decrypted_buffer_size >= 0){
1429
942
1430
clearerr(stdout);
1431
943
written = 0;
1432
944
while(written < (size_t) decrypted_buffer_size){
1433
945
if(quit_now){
1449
961
}
1450
962
written += (size_t)ret;
1451
963
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
1462
964
retval = 0;
1463
965
}
1464
966
}
1467
969
1468
970
mandos_end:
1469
971
{
1470
if(route_added){
1471
if(not delete_local_route(ip, if_index)){
1472
fprintf_plus(stderr, "Failed to delete local route to %s on"
1473
" interface %d", ip, if_index);
1474
}
1475
}
1476
972
int e = errno;
1477
973
free(decrypted_buffer);
1478
974
free(buffer);
1479
975
if(tcp_sd >= 0){
1480
ret = close(tcp_sd);
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
977
}
1482
978
if(ret == -1){
1483
979
if(e == 0){
1508
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1509
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1510
1006
flags,
1511
void *mc){
1007
void* mc){
1512
1008
if(r == NULL){
1513
1009
return;
1514
1010
}
1517
1013
timed out */
1518
1014
1519
1015
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1521
1016
return;
1522
1017
}
1523
1018
1568
1063
const char *domain,
1569
1064
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1570
1065
flags,
1571
void *mc){
1066
void* mc){
1572
1067
if(b == NULL){
1573
1068
return;
1574
1069
}
1634
1129
errno = old_errno;
1635
1130
}
1636
1131
1637
__attribute__((nonnull, warn_unused_result))
1638
1132
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1133
int ret;
1640
int old_errno;
1134
error_t ret_errno;
1641
1135
1642
1136
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1137
if(s < 0){
1644
old_errno = errno;
1138
ret_errno = errno;
1645
1139
perror_plus("socket");
1646
errno = old_errno;
1140
errno = ret_errno;
1647
1141
return false;
1648
1142
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1143
strcpy(ifr->ifr_name, ifname);
1651
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1145
if(ret == -1){
1653
1146
if(debug){
1654
old_errno = errno;
1147
ret_errno = errno;
1655
1148
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1149
errno = ret_errno;
1657
1150
}
1658
1151
return false;
1659
1152
}
1660
1153
return true;
1661
1154
}
1662
1155
1663
__attribute__((nonnull, warn_unused_result))
1664
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1665
1157
1666
1158
/* Reject the loopback device */
1708
1200
* corresponds to an acceptable network device.
1709
1201
* (This function is passed to scandir(3) as a filter function.)
1710
1202
*/
1711
__attribute__((nonnull, warn_unused_result))
1712
1203
int good_interface(const struct dirent *if_entry){
1713
1204
if(if_entry->d_name[0] == '.'){
1714
1205
return 0;
1732
1223
/*
1733
1224
* This function determines if a network interface is up.
1734
1225
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
1226
bool interface_is_up(const char *interface){
1737
1227
struct ifreq ifr;
1738
1228
if(not get_flags(interface, &ifr)){
1749
1239
/*
1750
1240
* This function determines if a network interface is running
1751
1241
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
1242
bool interface_is_running(const char *interface){
1754
1243
struct ifreq ifr;
1755
1244
if(not get_flags(interface, &ifr)){
1763
1252
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
1253
}
1765
1254
1766
__attribute__((nonnull, pure, warn_unused_result))
1767
1255
int notdotentries(const struct dirent *direntry){
1768
1256
/* Skip "." and ".." */
1769
1257
if(direntry->d_name[0] == '.'
1776
1264
}
1777
1265
1778
1266
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1780
1267
int runnable_hook(const struct dirent *direntry){
1781
1268
int ret;
1782
1269
size_t sret;
1790
1277
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
1278
"abcdefghijklmnopqrstuvwxyz"
1792
1279
"0123456789"
1793
"_.-");
1280
"_-");
1794
1281
if((direntry->d_name)[sret] != '\0'){
1795
1282
/* Contains non-allowed characters */
1796
1283
if(debug){
1800
1287
return 0;
1801
1288
}
1802
1289
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1290
char *fullname = NULL;
1291
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1292
if(ret < 0){
1293
perror_plus("asprintf");
1294
return 0;
1295
}
1296
1297
ret = stat(fullname, &st);
1804
1298
if(ret == -1){
1805
1299
if(debug){
1806
1300
perror_plus("Could not stat hook");
1830
1324
return 1;
1831
1325
}
1832
1326
1833
__attribute__((nonnull, warn_unused_result))
1834
1327
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
1328
mandos_context *mc){
1836
1329
int ret;
1840
1333
1841
1334
while(true){
1842
1335
if(mc->current_server == NULL){
1843
if(debug){
1336
if (debug){
1844
1337
fprintf_plus(stderr, "Wait until first server is found."
1845
1338
" No timeout!\n");
1846
1339
}
1847
1340
ret = avahi_simple_poll_iterate(s, -1);
1848
1341
} else {
1849
if(debug){
1342
if (debug){
1850
1343
fprintf_plus(stderr, "Check current_server if we should run"
1851
1344
" it, or wait\n");
1852
1345
}
1869
1362
- ((intmax_t)waited_time.tv_sec * 1000))
1870
1363
- ((intmax_t)waited_time.tv_nsec / 1000000));
1871
1364
1872
if(debug){
1365
if (debug){
1873
1366
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
1367
block_time);
1875
1368
}
1897
1390
ret = avahi_simple_poll_iterate(s, (int)block_time);
1898
1391
}
1899
1392
if(ret != 0){
1900
if(ret > 0 or errno != EINTR){
1393
if (ret > 0 or errno != EINTR){
1901
1394
return (ret != 1) ? ret : 0;
1902
1395
}
1903
1396
}
1904
1397
}
1905
1398
}
1906
1399
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1400
/* Set effective uid to 0, return errno */
1401
error_t raise_privileges(void){
1402
error_t old_errno = errno;
1403
error_t ret_errno = 0;
1404
if(seteuid(0) == -1){
1405
ret_errno = errno;
1406
perror_plus("seteuid");
1407
}
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
1412
/* Set effective and real user ID to 0. Return errno. */
1413
error_t raise_privileges_permanently(void){
1414
error_t old_errno = errno;
1415
error_t ret_errno = raise_privileges();
1416
if(ret_errno != 0){
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
if(setuid(0) == -1){
1421
ret_errno = errno;
1422
perror_plus("seteuid");
1423
}
1424
errno = old_errno;
1425
return ret_errno;
1426
}
1427
1428
/* Set effective user ID to unprivileged saved user ID */
1429
error_t lower_privileges(void){
1430
error_t old_errno = errno;
1431
error_t ret_errno = 0;
1432
if(seteuid(uid) == -1){
1433
ret_errno = errno;
1434
perror_plus("seteuid");
1435
}
1436
errno = old_errno;
1437
return ret_errno;
1438
}
1439
1440
/* Lower privileges permanently */
1441
error_t lower_privileges_permanently(void){
1442
error_t old_errno = errno;
1443
error_t ret_errno = 0;
1444
if(setuid(uid) == -1){
1445
ret_errno = errno;
1446
perror_plus("setuid");
1447
}
1448
errno = old_errno;
1449
return ret_errno;
1450
}
1451
1452
bool run_network_hooks(const char *mode, const char *interface,
1909
1453
const float delay){
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1454
struct dirent **direntries;
1455
struct dirent *direntry;
1456
int ret;
1457
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1458
alphasort);
1928
1459
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1460
if(errno == ENOENT){
1461
if(debug){
1462
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1463
" found\n", hookdir);
1464
}
1465
} else {
1466
perror_plus("scandir");
1944
1467
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1468
} else {
1469
int devnull = open("/dev/null", O_RDONLY);
1470
for(int i = 0; i < numhooks; i++){
1471
direntry = direntries[i];
1472
char *fullname = NULL;
1473
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1474
if(ret < 0){
1991
1475
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1476
continue;
1477
}
1478
if(debug){
1479
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1480
direntry->d_name);
1481
}
1482
pid_t hook_pid = fork();
1483
if(hook_pid == 0){
1484
/* Child */
1485
/* Raise privileges */
1486
raise_privileges_permanently();
1487
/* Set group */
1488
errno = 0;
1489
ret = setgid(0);
1490
if(ret == -1){
1491
perror_plus("setgid");
1492
}
1493
/* Reset supplementary groups */
1494
errno = 0;
1495
ret = setgroups(0, NULL);
1496
if(ret == -1){
1497
perror_plus("setgroups");
1498
}
1499
dup2(devnull, STDIN_FILENO);
1500
close(devnull);
1501
dup2(STDERR_FILENO, STDOUT_FILENO);
1502
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1503
if(ret == -1){
1504
perror_plus("setenv");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DEVICE", interface, 1);
1508
if(ret == -1){
1509
perror_plus("setenv");
1510
_exit(EX_OSERR);
1511
}
1512
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
ret = setenv("MODE", mode, 1);
1518
if(ret == -1){
1519
perror_plus("setenv");
1520
_exit(EX_OSERR);
1521
}
1522
char *delaystring;
1523
ret = asprintf(&delaystring, "%f", delay);
1524
if(ret == -1){
1525
perror_plus("asprintf");
1526
_exit(EX_OSERR);
1527
}
1528
ret = setenv("DELAY", delaystring, 1);
1529
if(ret == -1){
1530
free(delaystring);
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1996
1534
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
1535
if(connect_to != NULL){
1536
ret = setenv("CONNECT", connect_to, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
}
1542
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1543
perror_plus("execl");
1544
_exit(EXIT_FAILURE);
1545
}
2065
1546
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
1547
int status;
1548
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1549
perror_plus("waitpid");
1550
free(fullname);
1551
continue;
1552
}
1553
if(WIFEXITED(status)){
1554
if(WEXITSTATUS(status) != 0){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1556
" with status %d\n", direntry->d_name,
1557
WEXITSTATUS(status));
1558
free(fullname);
1559
continue;
1560
}
1561
} else if(WIFSIGNALED(status)){
1562
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1563
" signal %d\n", direntry->d_name,
1564
WTERMSIG(status));
1565
free(fullname);
1566
continue;
1567
} else {
1568
fprintf_plus(stderr, "Warning: network hook \"%s\""
1569
" crashed\n", direntry->d_name);
1570
free(fullname);
1571
continue;
1572
}
1573
}
1574
free(fullname);
1575
if(debug){
1576
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1577
direntry->d_name);
1578
}
1579
}
1580
close(devnull);
1581
}
1582
return true;
2085
1583
}
2086
1584
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2091
int ret;
1585
error_t bring_up_interface(const char *const interface,
1586
const float delay){
1587
int sd = -1;
1588
error_t old_errno = errno;
1589
error_t ret_errno = 0;
1590
int ret, ret_setflags;
2092
1591
struct ifreq network;
2093
1592
unsigned int if_index = if_nametoindex(interface);
2094
1593
if(if_index == 0){
2103
1602
}
2104
1603
2105
1604
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
1605
if(not get_flags(interface, &network) and debug){
2109
1606
ret_errno = errno;
2110
1607
fprintf_plus(stderr, "Failed to get flags for interface "
2111
1608
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
1609
return ret_errno;
2114
1610
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
1611
network.ifr_flags |= IFF_UP;
2116
1612
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
1613
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1614
if(sd < 0){
2119
1615
ret_errno = errno;
2120
1616
perror_plus("socket");
2121
1617
errno = old_errno;
2122
1618
return ret_errno;
2123
1619
}
2124
1620
2125
1621
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
1622
close(sd);
2130
1623
errno = old_errno;
2131
1624
return EINTR;
2132
1625
}
2136
1629
interface);
2137
1630
}
2138
1631
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
1632
/* Raise priviliges */
1633
raise_privileges();
2145
1634
2146
1635
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
1636
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1637
messages about the network interface to mess up the prompt */
1638
int ret_linux = klogctl(8, NULL, 5);
1639
bool restore_loglevel = true;
1640
if(ret_linux == -1){
1641
restore_loglevel = false;
1642
perror_plus("klogctl");
2158
1643
}
2159
1644
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
1645
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1646
ret_errno = errno;
2162
1647
#ifdef __linux__
2163
1648
if(restore_loglevel){
2164
1649
ret_linux = klogctl(7, NULL, 0);
2168
1653
}
2169
1654
#endif /* __linux__ */
2170
1655
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
1656
/* Lower privileges */
1657
lower_privileges();
2180
1658
2181
1659
/* Close the socket */
2182
ret = close(sd);
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1661
if(ret == -1){
2184
1662
perror_plus("close");
2185
1663
}
2186
1664
2187
1665
if(ret_setflags == -1){
2188
errno = ioctl_errno;
1666
errno = ret_errno;
2189
1667
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
1668
errno = old_errno;
2191
return ioctl_errno;
1669
return ret_errno;
2192
1670
}
2193
1671
} else if(debug){
2194
1672
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2197
1675
2198
1676
/* Sleep checking until interface is running.
2199
1677
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
1678
for(int i=0; i < delay * 4; i++){
2201
1679
if(interface_is_running(interface)){
2202
1680
break;
2203
1681
}
2212
1690
return 0;
2213
1691
}
2214
1692
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
1693
error_t take_down_interface(const char *const interface){
1694
int sd = -1;
1695
error_t old_errno = errno;
1696
error_t ret_errno = 0;
1697
int ret, ret_setflags;
2218
1698
struct ifreq network;
2219
1699
unsigned int if_index = if_nametoindex(interface);
2220
1700
if(if_index == 0){
2223
1703
return ENXIO;
2224
1704
}
2225
1705
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2228
1706
if(not get_flags(interface, &network) and debug){
2229
1707
ret_errno = errno;
2230
1708
fprintf_plus(stderr, "Failed to get flags for interface "
2231
1709
"\"%s\"\n", interface);
2232
errno = old_errno;
2233
1710
return ret_errno;
2234
1711
}
2235
1712
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
1713
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
1714
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1715
if(sd < 0){
2239
1716
ret_errno = errno;
2240
1717
perror_plus("socket");
2241
1718
errno = old_errno;
2247
1724
interface);
2248
1725
}
2249
1726
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2252
if(ret_errno != 0){
2253
errno = ret_errno;
2254
perror_plus("Failed to raise privileges");
2255
}
2256
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2259
2260
/* If raise_privileges() succeeded above */
2261
if(ret_errno == 0){
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
1727
/* Raise priviliges */
1728
raise_privileges();
1729
1730
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1731
ret_errno = errno;
1732
1733
/* Lower privileges */
1734
lower_privileges();
2269
1735
2270
1736
/* Close the socket */
2271
int ret = close(sd);
1737
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2272
1738
if(ret == -1){
2273
1739
perror_plus("close");
2274
1740
}
2275
1741
2276
1742
if(ret_setflags == -1){
2277
errno = ioctl_errno;
1743
errno = ret_errno;
2278
1744
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
1745
errno = old_errno;
2280
return ioctl_errno;
1746
return ret_errno;
2281
1747
}
2282
1748
} else if(debug){
2283
1749
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2289
1755
}
2290
1756
2291
1757
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1758
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1759
.priority = "SECURE256:!CTYPE-X.509:"
1760
"+CTYPE-OPENPGP", .current_server = NULL,
1761
.interfaces = NULL, .interfaces_size = 0 };
2297
1762
AvahiSServiceBrowser *sb = NULL;
2298
1763
error_t ret_errno;
2299
1764
int ret;
2302
1767
int exitcode = EXIT_SUCCESS;
2303
1768
char *interfaces_to_take_down = NULL;
2304
1769
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1770
char tempdir[] = "/tmp/mandosXXXXXX";
1771
bool tempdir_created = false;
2308
1772
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2309
1773
const char *seckey = PATHDIR "/" SECKEY;
2310
1774
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
1775
char *interfaces_hooks = NULL;
1776
size_t interfaces_hooks_size = 0;
2313
1777
2314
1778
bool gnutls_initialized = false;
2315
1779
bool gpgme_initialized = false;
2367
1831
.doc = "Bit length of the prime number used in the"
2368
1832
" Diffie-Hellman key exchange",
2369
1833
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
2375
1834
{ .name = "priority", .key = 130,
2376
1835
.arg = "STRING",
2377
1836
.doc = "GnuTLS priority string for the TLS handshake",
2432
1891
}
2433
1892
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2434
1893
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2438
1894
case 130: /* --priority */
2439
1895
mc.priority = arg;
2440
1896
break;
2480
1936
.args_doc = "",
2481
1937
.doc = "Mandos client -- Get and decrypt"
2482
1938
" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1939
ret = argp_parse(&argp, argc, argv,
1940
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1941
switch(ret){
2486
1942
case 0:
2487
1943
break;
2488
1944
case ENOMEM:
2489
1945
default:
2490
errno = ret_errno;
1946
errno = ret;
2491
1947
perror_plus("argp_parse");
2492
1948
exitcode = EX_OSERR;
2493
1949
goto end;
2496
1952
goto end;
2497
1953
}
2498
1954
}
2499
1955
2500
1956
{
2501
1957
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
1958
<http://bugs.debian.org/633582> */
2503
1959
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
2509
} else {
1960
/* Re-raise priviliges */
1961
if(raise_privileges() == 0){
2510
1962
struct stat st;
2511
1963
2512
1964
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2526
1978
}
2527
1979
}
2528
1980
}
2529
close(seckey_fd);
1981
TEMP_FAILURE_RETRY(close(seckey_fd));
2530
1982
}
2531
1983
}
2532
1984
2533
1985
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
1986
int pubkey_fd = open(pubkey, O_RDONLY);
2535
1987
if(pubkey_fd == -1){
2547
1999
}
2548
2000
}
2549
2001
}
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
2002
TEMP_FAILURE_RETRY(close(pubkey_fd));
2003
}
2004
}
2005
2576
2006
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
2007
errno = 0;
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2581
2011
}
2582
2012
}
2583
2013
}
2584
2014
2585
/* Remove invalid interface names (except "none") */
2015
/* Remove empty interface names */
2586
2016
{
2587
2017
char *interface = NULL;
2588
2018
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2589
2019
interface))){
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2020
if(if_nametoindex(interface) == 0){
2021
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2593
2022
fprintf_plus(stderr, "Not using nonexisting interface"
2594
2023
" \"%s\"\n", interface);
2595
2024
}
2601
2030
2602
2031
/* Run network hooks */
2603
2032
{
2033
2604
2034
if(mc.interfaces != NULL){
2605
2035
interfaces_hooks = malloc(mc.interfaces_size);
2606
2036
if(interfaces_hooks == NULL){
2608
2038
goto end;
2609
2039
}
2610
2040
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
}
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
2041
interfaces_hooks_size = mc.interfaces_size;
2042
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2043
(int)',');
2044
}
2045
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2046
interfaces_hooks : "", delay)){
2047
goto end;
2048
}
2615
2049
}
2616
2050
2617
2051
if(not debug){
2695
2129
2696
2130
/* If no interfaces were specified, make a list */
2697
2131
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2132
struct dirent **direntries;
2699
2133
/* Look for any good interfaces */
2700
2134
ret = scandir(sys_class_net, &direntries, good_interface,
2701
2135
alphasort);
2705
2139
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
2140
direntries[i]->d_name);
2707
2141
if(ret_errno != 0){
2708
errno = ret_errno;
2709
2142
perror_plus("argz_add");
2710
free(direntries[i]);
2711
2143
continue;
2712
2144
}
2713
2145
if(debug){
2714
2146
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
2147
direntries[i]->d_name);
2716
2148
}
2717
free(direntries[i]);
2718
2149
}
2719
2150
free(direntries);
2720
2151
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2152
free(direntries);
2724
2153
fprintf_plus(stderr, "Could not find a network interface\n");
2725
2154
exitcode = EXIT_FAILURE;
2726
2155
goto end;
2727
2156
}
2728
2157
}
2729
2158
2730
/* Bring up interfaces which are down, and remove any "none"s */
2731
{
2732
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2734
interface))){
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
2745
interface);
2746
interface = NULL;
2747
}
2748
}
2749
break;
2750
}
2751
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2753
if(not interface_was_up){
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2757
} else {
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2764
}
2765
}
2766
}
2767
if(debug and (interfaces_to_take_down == NULL)){
2768
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
}
2770
}
2771
2772
2159
/* If we only got one interface, explicitly use only that one */
2773
2160
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
2161
if(debug){
2778
2165
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2779
2166
}
2780
2167
2168
/* Bring up interfaces which are down */
2169
if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1
2170
and strcmp(mc.interfaces, "none") == 0)){
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
bool interface_was_up = interface_is_up(interface);
2175
ret = bring_up_interface(interface, delay);
2176
if(not interface_was_up){
2177
if(ret != 0){
2178
errno = ret;
2179
perror_plus("Failed to bring up interface");
2180
} else {
2181
ret_errno = argz_add(&interfaces_to_take_down,
2182
&interfaces_to_take_down_size,
2183
interface);
2184
}
2185
}
2186
}
2187
free(mc.interfaces);
2188
mc.interfaces = NULL;
2189
mc.interfaces_size = 0;
2190
if(debug and (interfaces_to_take_down == NULL)){
2191
fprintf_plus(stderr, "No interfaces were brought up\n");
2192
}
2193
}
2194
2781
2195
if(quit_now){
2782
2196
goto end;
2783
2197
}
2784
2198
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2199
ret = init_gnutls_global(pubkey, seckey, &mc);
2786
2200
if(ret == -1){
2787
2201
fprintf_plus(stderr, "init_gnutls_global failed\n");
2788
2202
exitcode = EX_UNAVAILABLE;
2795
2209
goto end;
2796
2210
}
2797
2211
2798
/* Try /run/tmp before /tmp */
2799
tempdir = mkdtemp(run_tempdir);
2800
if(tempdir == NULL and errno == ENOENT){
2801
if(debug){
2802
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2803
run_tempdir, old_tempdir);
2804
}
2805
tempdir = mkdtemp(old_tempdir);
2806
}
2807
if(tempdir == NULL){
2212
if(mkdtemp(tempdir) == NULL){
2808
2213
perror_plus("mkdtemp");
2809
2214
goto end;
2810
2215
}
2216
tempdir_created = true;
2811
2217
2812
2218
if(quit_now){
2813
2219
goto end;
2849
2255
exitcode = EX_USAGE;
2850
2256
goto end;
2851
2257
}
2852
2258
2853
2259
if(quit_now){
2854
2260
goto end;
2855
2261
}
2885
2291
fprintf_plus(stderr, "Retrying in %d seconds\n",
2886
2292
(int)retry_interval);
2887
2293
}
2888
sleep((unsigned int)retry_interval);
2294
sleep((int)retry_interval);
2889
2295
}
2890
2296
2891
if(not quit_now){
2297
if (not quit_now){
2892
2298
exitcode = EXIT_SUCCESS;
2893
2299
}
2894
2300
2910
2316
2911
2317
/* Allocate a new server */
2912
2318
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2319
&config, NULL, NULL, &ret_errno);
2914
2320
2915
2321
/* Free the Avahi configuration data */
2916
2322
avahi_server_config_free(&config);
2919
2325
/* Check if creating the Avahi server object succeeded */
2920
2326
if(mc.server == NULL){
2921
2327
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2328
avahi_strerror(ret_errno));
2923
2329
exitcode = EX_UNAVAILABLE;
2924
2330
goto end;
2925
2331
}
2949
2355
if(debug){
2950
2356
fprintf_plus(stderr, "Starting Avahi loop search\n");
2951
2357
}
2952
2358
2953
2359
ret = avahi_loop_with_timeout(simple_poll,
2954
2360
(int)(retry_interval * 1000), &mc);
2955
2361
if(debug){
2960
2366
end:
2961
2367
2962
2368
if(debug){
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2369
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
2370
}
2971
2371
2972
2372
/* Cleanup things */
2973
free(mc.interfaces);
2974
2975
2373
if(sb != NULL)
2976
2374
avahi_s_service_browser_free(sb);
2977
2375
2983
2381
2984
2382
if(gnutls_initialized){
2985
2383
gnutls_certificate_free_credentials(mc.cred);
2384
gnutls_global_deinit();
2986
2385
gnutls_dh_params_deinit(mc.dh_params);
2987
2386
}
2988
2387
2996
2395
mc.current_server->prev->next = NULL;
2997
2396
while(mc.current_server != NULL){
2998
2397
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
3007
2398
free(mc.current_server);
3008
2399
mc.current_server = next;
3009
2400
}
3010
2401
}
3011
2402
3012
/* Re-raise privileges */
2403
/* Re-raise priviliges */
3013
2404
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3017
perror_plus("Failed to raise privileges");
3018
} else {
3019
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3023
3024
/* Take down the network interfaces which were brought up */
3025
{
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3033
perror_plus("Failed to take down interface");
3034
}
3035
}
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3038
" down\n");
3039
}
3040
}
3041
}
3042
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
3047
}
2405
raise_privileges();
2406
2407
/* Run network hooks */
2408
run_network_hooks("stop", interfaces_hooks != NULL ?
2409
interfaces_hooks : "", delay);
2410
2411
/* Take down the network interfaces which were brought up */
2412
{
2413
char *interface = NULL;
2414
while((interface=argz_next(interfaces_to_take_down,
2415
interfaces_to_take_down_size,
2416
interface))){
2417
ret_errno = take_down_interface(interface);
2418
if(ret_errno != 0){
2419
errno = ret_errno;
2420
perror_plus("Failed to take down interface");
2421
}
2422
}
2423
if(debug and (interfaces_to_take_down == NULL)){
2424
fprintf_plus(stderr, "No interfaces needed to be taken"
2425
" down\n");
2426
}
2427
}
2428
2429
lower_privileges_permanently();
3048
2430
}
3049
2431
3050
2432
free(interfaces_to_take_down);
3051
2433
free(interfaces_hooks);
3052
2434
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
2435
/* Removes the GPGME temp directory and all files inside */
2436
if(tempdir_created){
3055
2437
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
2438
struct dirent *direntry = NULL;
2439
int numentries = scandir(tempdir, &direntries, notdotentries,
2440
alphasort);
2441
if (numentries > 0){
3068
2442
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
3109
/* Removes the GPGME temp directory and all files inside */
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2443
direntry = direntries[i];
2444
char *fullname = NULL;
2445
ret = asprintf(&fullname, "%s/%s", tempdir,
2446
direntry->d_name);
2447
if(ret < 0){
2448
perror_plus("asprintf");
2449
continue;
2450
}
2451
ret = remove(fullname);
2452
if(ret == -1){
2453
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2454
strerror(errno));
2455
}
2456
free(fullname);
2457
}
2458
}
2459
2460
/* need to clean even if 0 because man page doesn't specify */
2461
free(direntries);
2462
if (numentries == -1){
2463
perror_plus("scandir");
2464
}
2465
ret = rmdir(tempdir);
2466
if(ret == -1 and errno != ENOENT){
2467
perror_plus("rmdir");
2468
}
3112
2469
}
3113
2470
3114
2471
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0