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- Committer: Teddy Hogeborn
- Date: 2018-02-22 18:50:12 UTC
- mto: This revision was merged to the branch mainline in revision 943.
- Revision ID: teddy@recompile.se-20180222185012-etchk537ast7s1xg
Tags: version-1.7.19-1
* Makefile (version): Change to 1.7.19.
* NEWS (Version 1.7.19): Add new entry.
* debian/changelog (1.7.19-1): - '' -
* NEWS (Version 1.7.19): Add new entry.
* debian/changelog (1.7.19-1): - '' -
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 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
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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
stdout, ferror() */
44
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
72
program_invocation_short_name */
66
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
72
79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
81
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
85
#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
79
87
argp_state, struct argp,
91
99
argz_delete(), argz_append(),
92
100
argz_stringify(), argz_add(),
93
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
94
104
95
105
#ifdef __linux__
96
106
#include <sys/klog.h> /* klogctl() */
138
148
static const char sys_class_net[] = "/sys/class/net";
139
149
char *connect_to = NULL;
140
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
141
152
uid_t uid = 65534;
142
153
gid_t gid = 65534;
143
154
161
172
const char *priority;
162
173
gpgme_ctx_t ctx;
163
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
164
177
} mandos_context;
165
178
166
179
/* global so signal handler can reach it*/
178
191
perror(print_text);
179
192
}
180
193
181
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
182
195
int fprintf_plus(FILE *stream, const char *format, ...){
183
196
va_list ap;
184
197
va_start (ap, format);
185
198
186
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
187
200
program_invocation_short_name));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
202
}
190
203
191
204
/*
193
206
* bytes. "buffer_capacity" is how much is currently allocated,
194
207
* "buffer_length" is how much is already used.
195
208
*/
209
__attribute__((nonnull, warn_unused_result))
196
210
size_t incbuffer(char **buffer, size_t buffer_length,
197
211
size_t buffer_capacity){
198
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
200
if(buffer == NULL){
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
219
return 0;
202
220
}
221
*buffer = new_buf;
203
222
buffer_capacity += BUFFER_SIZE;
204
223
}
205
224
return buffer_capacity;
206
225
}
207
226
208
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
209
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
210
230
int af, server **current_server){
211
231
int ret;
220
240
.af = af };
221
241
if(new_server->ip == NULL){
222
242
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);
223
258
return false;
224
259
}
225
260
/* Special case of first server */
227
262
new_server->next = new_server;
228
263
new_server->prev = new_server;
229
264
*current_server = new_server;
230
/* Place the new server last in the list */
231
265
} else {
266
/* Place the new server last in the list */
232
267
new_server->next = *current_server;
233
268
new_server->prev = (*current_server)->prev;
234
269
new_server->prev->next = new_server;
235
270
(*current_server)->prev = new_server;
236
271
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
272
return true;
243
273
}
244
274
245
275
/*
246
276
* Initialize GPGME.
247
277
*/
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
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
283
gpgme_error_t rc;
251
284
gpgme_engine_info_t engine_info;
252
285
253
286
/*
254
287
* Helper function to insert pub and seckey to the engine keyring.
255
288
*/
256
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
257
290
int ret;
258
291
int fd;
259
292
gpgme_data_t pgp_data;
278
311
return false;
279
312
}
280
313
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
282
315
if(ret == -1){
283
316
perror_plus("close");
284
317
}
340
373
* Decrypt OpenPGP data.
341
374
* Returns -1 on error
342
375
*/
376
__attribute__((nonnull, warn_unused_result))
343
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
378
size_t crypto_size,
345
379
char **plaintext,
465
499
return plaintext_length;
466
500
}
467
501
468
static const char * safer_gnutls_strerror(int value){
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){
469
511
const char *ret = gnutls_strerror(value);
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
512
return safe_string(ret);
473
513
}
474
514
475
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
476
517
static void debuggnutls(__attribute__((unused)) int level,
477
518
const char* string){
478
519
fprintf_plus(stderr, "GnuTLS: %s", string);
479
520
}
480
521
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
481
523
static int init_gnutls_global(const char *pubkeyfilename,
482
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
483
526
mandos_context *mc){
484
527
int ret;
528
unsigned int uret;
485
529
486
530
if(debug){
487
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
488
532
}
489
533
490
ret = gnutls_global_init();
491
if(ret != GNUTLS_E_SUCCESS){
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
494
return -1;
495
}
496
497
534
if(debug){
498
535
/* "Use a log level over 10 to enable all debugging options."
499
536
* - GnuTLS manual
507
544
if(ret != GNUTLS_E_SUCCESS){
508
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
546
safer_gnutls_strerror(ret));
510
gnutls_global_deinit();
511
547
return -1;
512
548
}
513
549
538
574
safer_gnutls_strerror(ret));
539
575
goto globalfail;
540
576
}
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
545
goto globalfail;
546
}
547
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
548
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
549
755
550
756
return 0;
552
758
globalfail:
553
759
554
760
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_global_deinit();
556
761
gnutls_dh_params_deinit(mc->dh_params);
557
762
return -1;
558
763
}
559
764
765
__attribute__((nonnull, warn_unused_result))
560
766
static int init_gnutls_session(gnutls_session_t *session,
561
767
mandos_context *mc){
562
768
int ret;
609
815
/* ignore client certificate if any. */
610
816
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
817
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
613
614
818
return 0;
615
819
}
616
820
618
822
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
823
__attribute__((unused)) const char *txt){}
620
824
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
621
1043
/* Called when a Mandos server is found */
1044
__attribute__((nonnull, warn_unused_result))
622
1045
static int start_mandos_communication(const char *ip, in_port_t port,
623
1046
AvahiIfIndex if_index,
624
1047
int af, mandos_context *mc){
625
1048
int ret, tcp_sd = -1;
626
1049
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1050
struct sockaddr_storage to;
631
1051
char *buffer = NULL;
632
1052
char *decrypted_buffer = NULL;
633
1053
size_t buffer_length = 0;
636
1056
int retval = -1;
637
1057
gnutls_session_t session;
638
1058
int pf; /* Protocol family */
1059
bool route_added = false;
639
1060
640
1061
errno = 0;
641
1062
657
1078
return -1;
658
1079
}
659
1080
1081
/* If the interface is specified and we have a list of interfaces */
1082
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1083
/* Check if the interface is one of the interfaces we are using */
1084
bool match = false;
1085
{
1086
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
match = true;
1092
break;
1093
}
1094
}
1095
}
1096
if(not match){
1097
/* This interface does not match any in the list, so we don't
1098
connect to the server */
1099
if(debug){
1100
char interface[IF_NAMESIZE];
1101
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1102
perror_plus("if_indextoname");
1103
} else {
1104
fprintf_plus(stderr, "Skipping server on non-used interface"
1105
" \"%s\"\n",
1106
if_indextoname((unsigned int)if_index,
1107
interface));
1108
}
1109
}
1110
return -1;
1111
}
1112
}
1113
660
1114
ret = init_gnutls_session(&session, mc);
661
1115
if(ret != 0){
662
1116
return -1;
667
1121
PRIuMAX "\n", ip, (uintmax_t)port);
668
1122
}
669
1123
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1125
if(tcp_sd < 0){
672
1126
int e = errno;
673
1127
perror_plus("socket");
680
1134
goto mandos_end;
681
1135
}
682
1136
683
memset(&to, 0, sizeof(to));
684
1137
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
687
1141
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
690
1145
}
691
1146
if(ret < 0 ){
692
1147
int e = errno;
701
1156
goto mandos_end;
702
1157
}
703
1158
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
1159
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1160
if(IN6_IS_ADDR_LINKLOCAL
1161
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1162
if(if_index == AVAHI_IF_UNSPEC){
709
1163
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1164
" incomplete without a network interface\n");
712
1166
goto mandos_end;
713
1167
}
714
1168
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1169
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1170
}
717
1171
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1172
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1173
}
722
1174
723
1175
if(quit_now){
740
1192
}
741
1193
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1194
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
757
}
758
}
759
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
goto mandos_end;
1195
if(af == AF_INET6){
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in6),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
} else {
1201
ret = getnameinfo((struct sockaddr *)&to,
1202
sizeof(struct sockaddr_in),
1203
addrstr, sizeof(addrstr), NULL, 0,
1204
NI_NUMERICHOST);
1205
}
1206
if(ret == EAI_SYSTEM){
1207
perror_plus("getnameinfo");
1208
} else if(ret != 0) {
1209
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1210
} else if(strcmp(addrstr, ip) != 0){
1211
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1212
}
1213
}
1214
1215
if(quit_now){
1216
errno = EINTR;
1217
goto mandos_end;
1218
}
1219
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
782
1275
}
783
1276
784
1277
const char *out = mandos_protocol_version;
938
1431
&decrypted_buffer, mc);
939
1432
if(decrypted_buffer_size >= 0){
940
1433
1434
clearerr(stdout);
941
1435
written = 0;
942
1436
while(written < (size_t) decrypted_buffer_size){
943
1437
if(quit_now){
959
1453
}
960
1454
written += (size_t)ret;
961
1455
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
962
1466
retval = 0;
963
1467
}
964
1468
}
967
1471
968
1472
mandos_end:
969
1473
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
970
1480
int e = errno;
971
1481
free(decrypted_buffer);
972
1482
free(buffer);
973
1483
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1484
ret = close(tcp_sd);
975
1485
}
976
1486
if(ret == -1){
977
1487
if(e == 0){
1002
1512
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1513
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1514
flags,
1005
void* mc){
1515
void *mc){
1006
1516
if(r == NULL){
1007
1517
return;
1008
1518
}
1011
1521
timed out */
1012
1522
1013
1523
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1014
1525
return;
1015
1526
}
1016
1527
1061
1572
const char *domain,
1062
1573
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1063
1574
flags,
1064
void* mc){
1575
void *mc){
1065
1576
if(b == NULL){
1066
1577
return;
1067
1578
}
1127
1638
errno = old_errno;
1128
1639
}
1129
1640
1641
__attribute__((nonnull, warn_unused_result))
1130
1642
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
1643
int ret;
1132
error_t ret_errno;
1644
int old_errno;
1133
1645
1134
1646
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1135
1647
if(s < 0){
1136
ret_errno = errno;
1648
old_errno = errno;
1137
1649
perror_plus("socket");
1138
errno = ret_errno;
1650
errno = old_errno;
1139
1651
return false;
1140
1652
}
1141
strcpy(ifr->ifr_name, ifname);
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1142
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1143
1656
if(ret == -1){
1144
1657
if(debug){
1145
ret_errno = errno;
1658
old_errno = errno;
1146
1659
perror_plus("ioctl SIOCGIFFLAGS");
1147
errno = ret_errno;
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1148
1666
}
1149
1667
return false;
1150
1668
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1151
1674
return true;
1152
1675
}
1153
1676
1677
__attribute__((nonnull, warn_unused_result))
1154
1678
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1679
1156
1680
/* Reject the loopback device */
1198
1722
* corresponds to an acceptable network device.
1199
1723
* (This function is passed to scandir(3) as a filter function.)
1200
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1201
1726
int good_interface(const struct dirent *if_entry){
1202
1727
if(if_entry->d_name[0] == '.'){
1203
1728
return 0;
1221
1746
/*
1222
1747
* This function determines if a network interface is up.
1223
1748
*/
1749
__attribute__((nonnull, warn_unused_result))
1224
1750
bool interface_is_up(const char *interface){
1225
1751
struct ifreq ifr;
1226
1752
if(not get_flags(interface, &ifr)){
1237
1763
/*
1238
1764
* This function determines if a network interface is running
1239
1765
*/
1766
__attribute__((nonnull, warn_unused_result))
1240
1767
bool interface_is_running(const char *interface){
1241
1768
struct ifreq ifr;
1242
1769
if(not get_flags(interface, &ifr)){
1250
1777
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1251
1778
}
1252
1779
1780
__attribute__((nonnull, pure, warn_unused_result))
1253
1781
int notdotentries(const struct dirent *direntry){
1254
1782
/* Skip "." and ".." */
1255
1783
if(direntry->d_name[0] == '.'
1262
1790
}
1263
1791
1264
1792
/* Is this directory entry a runnable program? */
1793
__attribute__((nonnull, warn_unused_result))
1265
1794
int runnable_hook(const struct dirent *direntry){
1266
1795
int ret;
1267
1796
size_t sret;
1275
1804
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
1805
"abcdefghijklmnopqrstuvwxyz"
1277
1806
"0123456789"
1278
"_-");
1807
"_.-");
1279
1808
if((direntry->d_name)[sret] != '\0'){
1280
1809
/* Contains non-allowed characters */
1281
1810
if(debug){
1285
1814
return 0;
1286
1815
}
1287
1816
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1290
if(ret < 0){
1291
perror_plus("asprintf");
1292
return 0;
1293
}
1294
1295
ret = stat(fullname, &st);
1817
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1296
1818
if(ret == -1){
1297
1819
if(debug){
1298
1820
perror_plus("Could not stat hook");
1322
1844
return 1;
1323
1845
}
1324
1846
1847
__attribute__((nonnull, warn_unused_result))
1325
1848
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
1849
mandos_context *mc){
1327
1850
int ret;
1331
1854
1332
1855
while(true){
1333
1856
if(mc->current_server == NULL){
1334
if (debug){
1857
if(debug){
1335
1858
fprintf_plus(stderr, "Wait until first server is found."
1336
1859
" No timeout!\n");
1337
1860
}
1338
1861
ret = avahi_simple_poll_iterate(s, -1);
1339
1862
} else {
1340
if (debug){
1863
if(debug){
1341
1864
fprintf_plus(stderr, "Check current_server if we should run"
1342
1865
" it, or wait\n");
1343
1866
}
1360
1883
- ((intmax_t)waited_time.tv_sec * 1000))
1361
1884
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1885
1363
if (debug){
1886
if(debug){
1364
1887
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
1888
block_time);
1366
1889
}
1388
1911
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
1912
}
1390
1913
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1914
if(ret > 0 or errno != EINTR){
1392
1915
return (ret != 1) ? ret : 0;
1393
1916
}
1394
1917
}
1395
1918
}
1396
1919
}
1397
1920
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1403
ret_errno = errno;
1404
perror_plus("seteuid");
1405
}
1406
errno = old_errno;
1407
return ret_errno;
1408
}
1409
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1414
if(ret_errno != 0){
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
if(setuid(0) == -1){
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1421
}
1422
errno = old_errno;
1423
return ret_errno;
1424
}
1425
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1433
}
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1443
ret_errno = errno;
1444
perror_plus("setuid");
1445
}
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
1450
bool run_network_hooks(const char *mode, const char *interface,
1921
__attribute__((nonnull))
1922
void run_network_hooks(const char *mode, const char *interface,
1451
1923
const float delay){
1452
struct dirent **direntries;
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1930
if(debug){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1933
}
1934
} else {
1935
perror_plus("open");
1936
}
1937
return;
1938
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1947
if(numhooks == -1){
1948
perror_plus("scandir");
1949
close(devnull);
1950
return;
1951
}
1453
1952
struct dirent *direntry;
1454
1953
int ret;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
alphasort);
1457
if(numhooks == -1){
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
perror_plus("scandir");
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1956
if(debug){
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1958
direntry->d_name);
1465
1959
}
1466
} else {
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1472
if(ret < 0){
1960
pid_t hook_pid = fork();
1961
if(hook_pid == 0){
1962
/* Child */
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1966
perror_plus("Failed to raise privileges");
1967
_exit(EX_NOPERM);
1968
}
1969
/* Set group */
1970
errno = 0;
1971
ret = setgid(0);
1972
if(ret == -1){
1973
perror_plus("setgid");
1974
_exit(EX_NOPERM);
1975
}
1976
/* Reset supplementary groups */
1977
errno = 0;
1978
ret = setgroups(0, NULL);
1979
if(ret == -1){
1980
perror_plus("setgroups");
1981
_exit(EX_NOPERM);
1982
}
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
ret = setenv("DEVICE", interface, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1994
if(ret == -1){
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("MODE", mode, 1);
1999
if(ret == -1){
2000
perror_plus("setenv");
2001
_exit(EX_OSERR);
2002
}
2003
char *delaystring;
2004
ret = asprintf(&delaystring, "%f", (double)delay);
2005
if(ret == -1){
1473
2006
perror_plus("asprintf");
1474
continue;
1475
}
1476
if(debug){
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1478
direntry->d_name);
1479
}
1480
pid_t hook_pid = fork();
1481
if(hook_pid == 0){
1482
/* Child */
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1485
/* Set group */
1486
errno = 0;
1487
ret = setgid(0);
1488
if(ret == -1){
1489
perror_plus("setgid");
1490
}
1491
/* Reset supplementary groups */
1492
errno = 0;
1493
ret = setgroups(0, NULL);
1494
if(ret == -1){
1495
perror_plus("setgroups");
1496
}
1497
dup2(devnull, STDIN_FILENO);
1498
close(devnull);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("DEVICE", interface, 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
ret = setenv("MODE", mode, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
char *delaystring;
1521
ret = asprintf(&delaystring, "%f", delay);
1522
if(ret == -1){
1523
perror_plus("asprintf");
1524
_exit(EX_OSERR);
1525
}
1526
ret = setenv("DELAY", delaystring, 1);
1527
if(ret == -1){
1528
free(delaystring);
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
2007
_exit(EX_OSERR);
2008
}
2009
ret = setenv("DELAY", delaystring, 1);
2010
if(ret == -1){
1532
2011
free(delaystring);
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
}
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1543
}
2012
perror_plus("setenv");
2013
_exit(EX_OSERR);
2014
}
2015
free(delaystring);
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2018
if(ret == -1){
2019
perror_plus("setenv");
2020
_exit(EX_OSERR);
2021
}
2022
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2053
}
2054
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
int status;
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2063
free(direntry);
2064
continue;
2065
}
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2071
free(direntry);
2072
continue;
2073
}
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
2077
WTERMSIG(status));
2078
free(direntry);
2079
continue;
1544
2080
} else {
1545
int status;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1548
free(fullname);
1549
continue;
1550
}
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1556
free(fullname);
1557
continue;
1558
}
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1562
WTERMSIG(status));
1563
free(fullname);
1564
continue;
1565
} else {
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1568
free(fullname);
1569
continue;
1570
}
1571
}
1572
free(fullname);
1573
if(debug){
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1575
direntry->d_name);
1576
}
1577
}
1578
close(devnull);
1579
}
1580
return true;
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
continue;
2085
}
2086
}
2087
if(debug){
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
direntry->d_name);
2090
}
2091
free(direntry);
2092
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
2096
} else {
2097
hookdir_fd = -1;
2098
}
2099
close(devnull);
1581
2100
}
1582
2101
1583
error_t bring_up_interface(const char *const interface,
1584
const float delay){
1585
int sd = -1;
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
2102
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2106
int ret;
1589
2107
struct ifreq network;
1590
2108
unsigned int if_index = if_nametoindex(interface);
1591
2109
if(if_index == 0){
1600
2118
}
1601
2119
1602
2120
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2123
if(not get_flags(interface, &network)){
1604
2124
ret_errno = errno;
1605
2125
fprintf_plus(stderr, "Failed to get flags for interface "
1606
2126
"\"%s\"\n", interface);
2127
errno = old_errno;
1607
2128
return ret_errno;
1608
2129
}
1609
network.ifr_flags |= IFF_UP;
2130
network.ifr_flags |= IFF_UP; /* set flag */
1610
2131
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
2132
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2133
if(sd == -1){
1613
2134
ret_errno = errno;
1614
2135
perror_plus("socket");
1615
2136
errno = old_errno;
1616
2137
return ret_errno;
1617
2138
}
1618
2139
1619
2140
if(quit_now){
1620
close(sd);
2141
ret = close(sd);
2142
if(ret == -1){
2143
perror_plus("close");
2144
}
1621
2145
errno = old_errno;
1622
2146
return EINTR;
1623
2147
}
1627
2151
interface);
1628
2152
}
1629
2153
1630
/* Raise priviliges */
1631
raise_privileges();
2154
/* Raise privileges */
2155
ret_errno = raise_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to raise privileges");
2159
}
1632
2160
1633
2161
#ifdef __linux__
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
2162
int ret_linux;
2163
bool restore_loglevel = false;
2164
if(ret_errno == 0){
2165
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2166
messages about the network interface to mess up the prompt */
2167
ret_linux = klogctl(8, NULL, 5);
2168
if(ret_linux == -1){
2169
perror_plus("klogctl");
2170
} else {
2171
restore_loglevel = true;
2172
}
1641
2173
}
1642
2174
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
2175
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2176
ioctl_errno = errno;
1645
2177
#ifdef __linux__
1646
2178
if(restore_loglevel){
1647
2179
ret_linux = klogctl(7, NULL, 0);
1651
2183
}
1652
2184
#endif /* __linux__ */
1653
2185
1654
/* Lower privileges */
1655
lower_privileges();
2186
/* If raise_privileges() succeeded above */
2187
if(ret_errno == 0){
2188
/* Lower privileges */
2189
ret_errno = lower_privileges();
2190
if(ret_errno != 0){
2191
errno = ret_errno;
2192
perror_plus("Failed to lower privileges");
2193
}
2194
}
1656
2195
1657
2196
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2197
ret = close(sd);
1659
2198
if(ret == -1){
1660
2199
perror_plus("close");
1661
2200
}
1662
2201
1663
2202
if(ret_setflags == -1){
1664
errno = ret_errno;
2203
errno = ioctl_errno;
1665
2204
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
2205
errno = old_errno;
1667
return ret_errno;
2206
return ioctl_errno;
1668
2207
}
1669
2208
} else if(debug){
1670
2209
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1673
2212
1674
2213
/* Sleep checking until interface is running.
1675
2214
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
2215
for(int i = 0; i < delay * 4; i++){
1677
2216
if(interface_is_running(interface)){
1678
2217
break;
1679
2218
}
1688
2227
return 0;
1689
2228
}
1690
2229
1691
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
2230
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
1696
2233
struct ifreq network;
1697
2234
unsigned int if_index = if_nametoindex(interface);
1698
2235
if(if_index == 0){
1701
2238
return ENXIO;
1702
2239
}
1703
2240
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
1704
2243
if(not get_flags(interface, &network) and debug){
1705
2244
ret_errno = errno;
1706
2245
fprintf_plus(stderr, "Failed to get flags for interface "
1707
2246
"\"%s\"\n", interface);
2247
errno = old_errno;
1708
2248
return ret_errno;
1709
2249
}
1710
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
2251
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
2252
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2253
if(sd == -1){
1714
2254
ret_errno = errno;
1715
2255
perror_plus("socket");
1716
2256
errno = old_errno;
1722
2262
interface);
1723
2263
}
1724
2264
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
lower_privileges();
2265
/* Raise privileges */
2266
ret_errno = raise_privileges();
2267
if(ret_errno != 0){
2268
errno = ret_errno;
2269
perror_plus("Failed to raise privileges");
2270
}
2271
2272
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2273
ioctl_errno = errno;
2274
2275
/* If raise_privileges() succeeded above */
2276
if(ret_errno == 0){
2277
/* Lower privileges */
2278
ret_errno = lower_privileges();
2279
if(ret_errno != 0){
2280
errno = ret_errno;
2281
perror_plus("Failed to lower privileges");
2282
}
2283
}
1733
2284
1734
2285
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
int ret = close(sd);
1736
2287
if(ret == -1){
1737
2288
perror_plus("close");
1738
2289
}
1739
2290
1740
2291
if(ret_setflags == -1){
1741
errno = ret_errno;
2292
errno = ioctl_errno;
1742
2293
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
2294
errno = old_errno;
1744
return ret_errno;
2295
return ioctl_errno;
1745
2296
}
1746
2297
} else if(debug){
1747
2298
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1753
2304
}
1754
2305
1755
2306
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1759
2312
AvahiSServiceBrowser *sb = NULL;
1760
2313
error_t ret_errno;
1761
2314
int ret;
1762
2315
intmax_t tmpmax;
1763
2316
char *tmp;
1764
2317
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
2318
char *interfaces_to_take_down = NULL;
1768
2319
size_t interfaces_to_take_down_size = 0;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
2320
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2321
char old_tempdir[] = "/tmp/mandosXXXXXX";
2322
char *tempdir = NULL;
1771
2323
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
2324
const char *seckey = PATHDIR "/" SECKEY;
1773
2325
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
1774
2327
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1776
2328
1777
2329
bool gnutls_initialized = false;
1778
2330
bool gpgme_initialized = false;
1830
2382
.doc = "Bit length of the prime number used in the"
1831
2383
" Diffie-Hellman key exchange",
1832
2384
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
1833
2390
{ .name = "priority", .key = 130,
1834
2391
.arg = "STRING",
1835
2392
.doc = "GnuTLS priority string for the TLS handshake",
1869
2426
connect_to = arg;
1870
2427
break;
1871
2428
case 'i': /* --interface */
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
2429
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2430
arg, (int)',');
1874
2431
if(ret_errno != 0){
1875
2432
argp_error(state, "%s", strerror(ret_errno));
1876
2433
}
1890
2447
}
1891
2448
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1892
2449
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
1893
2453
case 130: /* --priority */
1894
2454
mc.priority = arg;
1895
2455
break;
1935
2495
.args_doc = "",
1936
2496
.doc = "Mandos client -- Get and decrypt"
1937
2497
" passwords from a Mandos server" };
1938
ret = argp_parse(&argp, argc, argv,
1939
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1940
switch(ret){
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
1941
2501
case 0:
1942
2502
break;
1943
2503
case ENOMEM:
1944
2504
default:
1945
errno = ret;
2505
errno = ret_errno;
1946
2506
perror_plus("argp_parse");
1947
2507
exitcode = EX_OSERR;
1948
2508
goto end;
1951
2511
goto end;
1952
2512
}
1953
2513
}
1954
2514
1955
2515
{
1956
2516
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
2517
<https://bugs.debian.org/633582> */
1958
2518
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
2519
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2523
perror_plus("Failed to raise privileges");
2524
} else {
1961
2525
struct stat st;
1962
2526
1963
2527
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1977
2541
}
1978
2542
}
1979
2543
}
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
2544
close(seckey_fd);
1981
2545
}
1982
2546
}
1983
2547
1984
2548
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
2549
int pubkey_fd = open(pubkey, O_RDONLY);
1986
2550
if(pubkey_fd == -1){
1998
2562
}
1999
2563
}
2000
2564
}
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2002
}
2003
}
2004
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2005
2591
/* Lower privileges */
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to lower privileges");
2010
2596
}
2011
2597
}
2012
2598
}
2013
2599
2014
/* Remove empty interface names */
2600
/* Remove invalid interface names (except "none") */
2015
2601
{
2016
2602
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2603
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2018
2604
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2605
if(strcmp(interface, "none") != 0
2606
and if_nametoindex(interface) == 0){
2607
if(interface[0] != '\0'){
2021
2608
fprintf_plus(stderr, "Not using nonexisting interface"
2022
2609
" \"%s\"\n", interface);
2023
2610
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2611
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2025
2612
interface = NULL;
2026
2613
}
2027
2614
}
2029
2616
2030
2617
/* Run network hooks */
2031
2618
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2619
if(mc.interfaces != NULL){
2620
interfaces_hooks = malloc(mc.interfaces_size);
2035
2621
if(interfaces_hooks == NULL){
2036
2622
perror_plus("malloc");
2037
2623
goto end;
2038
2624
}
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
2625
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2626
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2627
}
2628
run_network_hooks("start", interfaces_hooks != NULL ?
2629
interfaces_hooks : "", delay);
2048
2630
}
2049
2631
2050
2632
if(not debug){
2127
2709
}
2128
2710
2129
2711
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2712
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2132
2714
/* Look for any good interfaces */
2133
2715
ret = scandir(sys_class_net, &direntries, good_interface,
2134
2716
alphasort);
2135
2717
if(ret >= 1){
2136
2718
/* Add all found interfaces to interfaces list */
2137
2719
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2720
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2139
2721
direntries[i]->d_name);
2140
2722
if(ret_errno != 0){
2723
errno = ret_errno;
2141
2724
perror_plus("argz_add");
2725
free(direntries[i]);
2142
2726
continue;
2143
2727
}
2144
2728
if(debug){
2145
2729
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
2730
direntries[i]->d_name);
2147
2731
}
2732
free(direntries[i]);
2148
2733
}
2149
2734
free(direntries);
2150
2735
} else {
2151
free(direntries);
2736
if(ret == 0){
2737
free(direntries);
2738
}
2152
2739
fprintf_plus(stderr, "Could not find a network interface\n");
2153
2740
exitcode = EXIT_FAILURE;
2154
2741
goto end;
2155
2742
}
2156
2743
}
2157
2744
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2745
/* Bring up interfaces which are down, and remove any "none"s */
2746
{
2170
2747
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2748
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2172
2749
interface))){
2750
/* If interface name is "none", stop bringing up interfaces.
2751
Also remove all instances of "none" from the list */
2752
if(strcmp(interface, "none") == 0){
2753
argz_delete(&mc.interfaces, &mc.interfaces_size,
2754
interface);
2755
interface = NULL;
2756
while((interface = argz_next(mc.interfaces,
2757
mc.interfaces_size, interface))){
2758
if(strcmp(interface, "none") == 0){
2759
argz_delete(&mc.interfaces, &mc.interfaces_size,
2760
interface);
2761
interface = NULL;
2762
}
2763
}
2764
break;
2765
}
2173
2766
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2767
errno = bring_up_interface(interface, delay);
2175
2768
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2178
perror_plus("Failed to bring up interface");
2769
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2179
2772
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2773
errno = argz_add(&interfaces_to_take_down,
2774
&interfaces_to_take_down_size,
2775
interface);
2776
if(errno != 0){
2777
perror_plus("argz_add");
2778
}
2183
2779
}
2184
2780
}
2185
2781
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
2782
if(debug and (interfaces_to_take_down == NULL)){
2190
2783
fprintf_plus(stderr, "No interfaces were brought up\n");
2191
2784
}
2192
2785
}
2193
2786
2787
/* If we only got one interface, explicitly use only that one */
2788
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2789
if(debug){
2790
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2791
mc.interfaces);
2792
}
2793
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2794
}
2795
2194
2796
if(quit_now){
2195
2797
goto end;
2196
2798
}
2197
2799
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2199
2801
if(ret == -1){
2200
2802
fprintf_plus(stderr, "init_gnutls_global failed\n");
2201
2803
exitcode = EX_UNAVAILABLE;
2208
2810
goto end;
2209
2811
}
2210
2812
2211
if(mkdtemp(tempdir) == NULL){
2813
/* Try /run/tmp before /tmp */
2814
tempdir = mkdtemp(run_tempdir);
2815
if(tempdir == NULL and errno == ENOENT){
2816
if(debug){
2817
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2818
run_tempdir, old_tempdir);
2819
}
2820
tempdir = mkdtemp(old_tempdir);
2821
}
2822
if(tempdir == NULL){
2212
2823
perror_plus("mkdtemp");
2213
2824
goto end;
2214
2825
}
2215
tempdir_created = true;
2216
2826
2217
2827
if(quit_now){
2218
2828
goto end;
2254
2864
exitcode = EX_USAGE;
2255
2865
goto end;
2256
2866
}
2257
2867
2258
2868
if(quit_now){
2259
2869
goto end;
2260
2870
}
2290
2900
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
2901
(int)retry_interval);
2292
2902
}
2293
sleep((int)retry_interval);
2903
sleep((unsigned int)retry_interval);
2294
2904
}
2295
2905
2296
if (not quit_now){
2906
if(not quit_now){
2297
2907
exitcode = EXIT_SUCCESS;
2298
2908
}
2299
2909
2315
2925
2316
2926
/* Allocate a new server */
2317
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
2928
&config, NULL, NULL, &ret);
2319
2929
2320
2930
/* Free the Avahi configuration data */
2321
2931
avahi_server_config_free(&config);
2324
2934
/* Check if creating the Avahi server object succeeded */
2325
2935
if(mc.server == NULL){
2326
2936
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
2937
avahi_strerror(ret));
2328
2938
exitcode = EX_UNAVAILABLE;
2329
2939
goto end;
2330
2940
}
2354
2964
if(debug){
2355
2965
fprintf_plus(stderr, "Starting Avahi loop search\n");
2356
2966
}
2357
2967
2358
2968
ret = avahi_loop_with_timeout(simple_poll,
2359
2969
(int)(retry_interval * 1000), &mc);
2360
2970
if(debug){
2365
2975
end:
2366
2976
2367
2977
if(debug){
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2369
2985
}
2370
2986
2371
2987
/* Cleanup things */
2988
free(mc.interfaces);
2989
2372
2990
if(sb != NULL)
2373
2991
avahi_s_service_browser_free(sb);
2374
2992
2380
2998
2381
2999
if(gnutls_initialized){
2382
3000
gnutls_certificate_free_credentials(mc.cred);
2383
gnutls_global_deinit();
2384
3001
gnutls_dh_params_deinit(mc.dh_params);
2385
3002
}
2386
3003
2394
3011
mc.current_server->prev->next = NULL;
2395
3012
while(mc.current_server != NULL){
2396
3013
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
2397
3022
free(mc.current_server);
2398
3023
mc.current_server = next;
2399
3024
}
2400
3025
}
2401
3026
2402
/* Re-raise priviliges */
3027
/* Re-raise privileges */
2403
3028
{
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
perror_plus("Failed to take down interface");
2420
}
2421
}
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
2425
}
2426
}
2427
2428
lower_privileges_permanently();
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to raise privileges");
3033
} else {
3034
3035
/* Run network hooks */
3036
run_network_hooks("stop", interfaces_hooks != NULL ?
3037
interfaces_hooks : "", delay);
3038
3039
/* Take down the network interfaces which were brought up */
3040
{
3041
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
3048
perror_plus("Failed to take down interface");
3049
}
3050
}
3051
if(debug and (interfaces_to_take_down == NULL)){
3052
fprintf_plus(stderr, "No interfaces needed to be taken"
3053
" down\n");
3054
}
3055
}
3056
}
3057
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3061
perror_plus("Failed to lower privileges permanently");
3062
}
2429
3063
}
2430
3064
2431
3065
free(interfaces_to_take_down);
2432
3066
free(interfaces_hooks);
2433
3067
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
2434
3122
/* Removes the GPGME temp directory and all files inside */
2435
if(tempdir_created){
2436
struct dirent **direntries = NULL;
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
2442
direntry = direntries[i];
2443
char *fullname = NULL;
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
2445
direntry->d_name);
2446
if(ret < 0){
2447
perror_plus("asprintf");
2448
continue;
2449
}
2450
ret = remove(fullname);
2451
if(ret == -1){
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
2454
}
2455
free(fullname);
2456
}
2457
}
2458
2459
/* need to clean even if 0 because man page doesn't specify */
2460
free(direntries);
2461
if (numentries == -1){
2462
perror_plus("scandir");
2463
}
2464
ret = rmdir(tempdir);
2465
if(ret == -1 and errno != ENOENT){
2466
perror_plus("rmdir");
2467
}
3123
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2468
3125
}
2469
3126
2470
3127
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0