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- Committer: Teddy Hogeborn
- Date: 2018-02-19 21:32:07 UTC
- Revision ID: teddy@recompile.se-20180219213207-0un0ylegx390pftq
Client bug fixes: Fix file descriptor leaks
* plugin-helpers/mandos-client.c (init_gnutls_global, get_flags):
Always close files and sockets after they are used.
* plugin-helpers/mandos-client.c (init_gnutls_global, get_flags):
Always close files and sockets after they are used.
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
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
548
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
549
752
550
753
return 0;
552
755
globalfail:
553
756
554
757
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_global_deinit();
556
758
gnutls_dh_params_deinit(mc->dh_params);
557
759
return -1;
558
760
}
559
761
762
__attribute__((nonnull, warn_unused_result))
560
763
static int init_gnutls_session(gnutls_session_t *session,
561
764
mandos_context *mc){
562
765
int ret;
609
812
/* ignore client certificate if any. */
610
813
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
814
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
613
614
815
return 0;
615
816
}
616
817
618
819
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
820
__attribute__((unused)) const char *txt){}
620
821
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
827
if(seteuid(0) == -1){
828
ret = errno;
829
}
830
errno = old_errno;
831
return ret;
832
}
833
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
840
errno = old_errno;
841
return ret;
842
}
843
if(setuid(0) == -1){
844
ret = errno;
845
}
846
errno = old_errno;
847
return ret;
848
}
849
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
855
if(seteuid(uid) == -1){
856
ret = errno;
857
}
858
errno = old_errno;
859
return ret;
860
}
861
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
867
if(setuid(uid) == -1){
868
ret = errno;
869
}
870
errno = old_errno;
871
return ret;
872
}
873
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
877
const char *address,
878
AvahiIfIndex if_index){
879
int ret;
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
886
if(debug){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
889
}
890
return false;
891
}
892
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
896
return false;
897
}
898
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
if(devnull == -1){
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
902
return false;
903
}
904
pid_t pid = fork();
905
if(pid == 0){
906
/* Child */
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
909
if(errno != 0){
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
912
} else {
913
/* Set group */
914
errno = 0;
915
ret = setgid(0);
916
if(ret == -1){
917
perror_plus("setgid");
918
_exit(EX_NOPERM);
919
}
920
/* Reset supplementary groups */
921
errno = 0;
922
ret = setgroups(0, NULL);
923
if(ret == -1){
924
perror_plus("setgroups");
925
_exit(EX_NOPERM);
926
}
927
}
928
ret = dup2(devnull, STDIN_FILENO);
929
if(ret == -1){
930
perror_plus("dup2(devnull, STDIN_FILENO)");
931
_exit(EX_OSERR);
932
}
933
ret = close(devnull);
934
if(ret == -1){
935
perror_plus("close");
936
_exit(EX_OSERR);
937
}
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
if(ret == -1){
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
_exit(EX_OSERR);
942
}
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
O_RDONLY
945
| O_DIRECTORY
946
| O_PATH
947
| O_CLOEXEC));
948
if(helperdir_fd == -1){
949
perror_plus("open");
950
_exit(EX_UNAVAILABLE);
951
}
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
helper, O_RDONLY));
954
if(helper_fd == -1){
955
perror_plus("openat");
956
close(helperdir_fd);
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
621
1040
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
622
1042
static int start_mandos_communication(const char *ip, in_port_t port,
623
1043
AvahiIfIndex if_index,
624
1044
int af, mandos_context *mc){
625
1045
int ret, tcp_sd = -1;
626
1046
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1047
struct sockaddr_storage to;
631
1048
char *buffer = NULL;
632
1049
char *decrypted_buffer = NULL;
633
1050
size_t buffer_length = 0;
636
1053
int retval = -1;
637
1054
gnutls_session_t session;
638
1055
int pf; /* Protocol family */
1056
bool route_added = false;
639
1057
640
1058
errno = 0;
641
1059
657
1075
return -1;
658
1076
}
659
1077
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
660
1111
ret = init_gnutls_session(&session, mc);
661
1112
if(ret != 0){
662
1113
return -1;
667
1118
PRIuMAX "\n", ip, (uintmax_t)port);
668
1119
}
669
1120
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1122
if(tcp_sd < 0){
672
1123
int e = errno;
673
1124
perror_plus("socket");
680
1131
goto mandos_end;
681
1132
}
682
1133
683
memset(&to, 0, sizeof(to));
684
1134
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
687
1138
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
690
1142
}
691
1143
if(ret < 0 ){
692
1144
int e = errno;
701
1153
goto mandos_end;
702
1154
}
703
1155
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*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1159
if(if_index == AVAHI_IF_UNSPEC){
709
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1161
" incomplete without a network interface\n");
712
1163
goto mandos_end;
713
1164
}
714
1165
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1167
}
717
1168
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1170
}
722
1171
723
1172
if(quit_now){
740
1189
}
741
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1191
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;
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
782
1272
}
783
1273
784
1274
const char *out = mandos_protocol_version;
938
1428
&decrypted_buffer, mc);
939
1429
if(decrypted_buffer_size >= 0){
940
1430
1431
clearerr(stdout);
941
1432
written = 0;
942
1433
while(written < (size_t) decrypted_buffer_size){
943
1434
if(quit_now){
959
1450
}
960
1451
written += (size_t)ret;
961
1452
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
962
1463
retval = 0;
963
1464
}
964
1465
}
967
1468
968
1469
mandos_end:
969
1470
{
1471
if(route_added){
1472
if(not delete_local_route(ip, if_index)){
1473
fprintf_plus(stderr, "Failed to delete local route to %s on"
1474
" interface %d", ip, if_index);
1475
}
1476
}
970
1477
int e = errno;
971
1478
free(decrypted_buffer);
972
1479
free(buffer);
973
1480
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
ret = close(tcp_sd);
975
1482
}
976
1483
if(ret == -1){
977
1484
if(e == 0){
1002
1509
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1510
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1511
flags,
1005
void* mc){
1512
void *mc){
1006
1513
if(r == NULL){
1007
1514
return;
1008
1515
}
1011
1518
timed out */
1012
1519
1013
1520
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1014
1522
return;
1015
1523
}
1016
1524
1061
1569
const char *domain,
1062
1570
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1063
1571
flags,
1064
void* mc){
1572
void *mc){
1065
1573
if(b == NULL){
1066
1574
return;
1067
1575
}
1127
1635
errno = old_errno;
1128
1636
}
1129
1637
1638
__attribute__((nonnull, warn_unused_result))
1130
1639
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
1640
int ret;
1132
error_t ret_errno;
1641
int old_errno;
1133
1642
1134
1643
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1135
1644
if(s < 0){
1136
ret_errno = errno;
1645
old_errno = errno;
1137
1646
perror_plus("socket");
1138
errno = ret_errno;
1647
errno = old_errno;
1139
1648
return false;
1140
1649
}
1141
strcpy(ifr->ifr_name, ifname);
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1142
1652
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1143
1653
if(ret == -1){
1144
1654
if(debug){
1145
ret_errno = errno;
1655
old_errno = errno;
1146
1656
perror_plus("ioctl SIOCGIFFLAGS");
1147
errno = ret_errno;
1657
errno = old_errno;
1148
1658
}
1659
close(s);
1149
1660
return false;
1150
1661
}
1662
close(s);
1151
1663
return true;
1152
1664
}
1153
1665
1666
__attribute__((nonnull, warn_unused_result))
1154
1667
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1668
1156
1669
/* Reject the loopback device */
1198
1711
* corresponds to an acceptable network device.
1199
1712
* (This function is passed to scandir(3) as a filter function.)
1200
1713
*/
1714
__attribute__((nonnull, warn_unused_result))
1201
1715
int good_interface(const struct dirent *if_entry){
1202
1716
if(if_entry->d_name[0] == '.'){
1203
1717
return 0;
1221
1735
/*
1222
1736
* This function determines if a network interface is up.
1223
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1224
1739
bool interface_is_up(const char *interface){
1225
1740
struct ifreq ifr;
1226
1741
if(not get_flags(interface, &ifr)){
1237
1752
/*
1238
1753
* This function determines if a network interface is running
1239
1754
*/
1755
__attribute__((nonnull, warn_unused_result))
1240
1756
bool interface_is_running(const char *interface){
1241
1757
struct ifreq ifr;
1242
1758
if(not get_flags(interface, &ifr)){
1250
1766
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1251
1767
}
1252
1768
1769
__attribute__((nonnull, pure, warn_unused_result))
1253
1770
int notdotentries(const struct dirent *direntry){
1254
1771
/* Skip "." and ".." */
1255
1772
if(direntry->d_name[0] == '.'
1262
1779
}
1263
1780
1264
1781
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1265
1783
int runnable_hook(const struct dirent *direntry){
1266
1784
int ret;
1267
1785
size_t sret;
1275
1793
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
1794
"abcdefghijklmnopqrstuvwxyz"
1277
1795
"0123456789"
1278
"_-");
1796
"_.-");
1279
1797
if((direntry->d_name)[sret] != '\0'){
1280
1798
/* Contains non-allowed characters */
1281
1799
if(debug){
1285
1803
return 0;
1286
1804
}
1287
1805
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);
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1296
1807
if(ret == -1){
1297
1808
if(debug){
1298
1809
perror_plus("Could not stat hook");
1322
1833
return 1;
1323
1834
}
1324
1835
1836
__attribute__((nonnull, warn_unused_result))
1325
1837
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
1838
mandos_context *mc){
1327
1839
int ret;
1331
1843
1332
1844
while(true){
1333
1845
if(mc->current_server == NULL){
1334
if (debug){
1846
if(debug){
1335
1847
fprintf_plus(stderr, "Wait until first server is found."
1336
1848
" No timeout!\n");
1337
1849
}
1338
1850
ret = avahi_simple_poll_iterate(s, -1);
1339
1851
} else {
1340
if (debug){
1852
if(debug){
1341
1853
fprintf_plus(stderr, "Check current_server if we should run"
1342
1854
" it, or wait\n");
1343
1855
}
1360
1872
- ((intmax_t)waited_time.tv_sec * 1000))
1361
1873
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1874
1363
if (debug){
1875
if(debug){
1364
1876
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
1877
block_time);
1366
1878
}
1388
1900
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
1901
}
1390
1902
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1903
if(ret > 0 or errno != EINTR){
1392
1904
return (ret != 1) ? ret : 0;
1393
1905
}
1394
1906
}
1395
1907
}
1396
1908
}
1397
1909
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,
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1451
1912
const float delay){
1452
struct dirent **direntries;
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1919
if(debug){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1922
}
1923
} else {
1924
perror_plus("open");
1925
}
1926
return;
1927
}
1928
}
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1936
if(numhooks == -1){
1937
perror_plus("scandir");
1938
close(devnull);
1939
return;
1940
}
1453
1941
struct dirent *direntry;
1454
1942
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");
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1945
if(debug){
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1947
direntry->d_name);
1465
1948
}
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){
1949
pid_t hook_pid = fork();
1950
if(hook_pid == 0){
1951
/* Child */
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1954
if(errno != 0){
1955
perror_plus("Failed to raise privileges");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Set group */
1959
errno = 0;
1960
ret = setgid(0);
1961
if(ret == -1){
1962
perror_plus("setgid");
1963
_exit(EX_NOPERM);
1964
}
1965
/* Reset supplementary groups */
1966
errno = 0;
1967
ret = setgroups(0, NULL);
1968
if(ret == -1){
1969
perror_plus("setgroups");
1970
_exit(EX_NOPERM);
1971
}
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("DEVICE", interface, 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
ret = setenv("MODE", mode, 1);
1988
if(ret == -1){
1989
perror_plus("setenv");
1990
_exit(EX_OSERR);
1991
}
1992
char *delaystring;
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1994
if(ret == -1){
1473
1995
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
}
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("DELAY", delaystring, 1);
1999
if(ret == -1){
1532
2000
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
}
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
free(delaystring);
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2007
if(ret == -1){
2008
perror_plus("setenv");
2009
_exit(EX_OSERR);
2010
}
2011
}
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
2015
if(hook_fd == -1){
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2018
}
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2022
}
2023
ret = dup2(devnull, STDIN_FILENO);
2024
if(ret == -1){
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2026
_exit(EX_OSERR);
2027
}
2028
ret = close(devnull);
2029
if(ret == -1){
2030
perror_plus("close");
2031
_exit(EX_OSERR);
2032
}
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2034
if(ret == -1){
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2036
_exit(EX_OSERR);
2037
}
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2039
environ) == -1){
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2042
}
2043
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
2049
int status;
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2052
free(direntry);
2053
continue;
2054
}
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2060
free(direntry);
2061
continue;
2062
}
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
2066
WTERMSIG(status));
2067
free(direntry);
2068
continue;
1544
2069
} 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;
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2072
free(direntry);
2073
continue;
2074
}
2075
}
2076
if(debug){
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
direntry->d_name);
2079
}
2080
free(direntry);
2081
}
2082
free(direntries);
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
2085
} else {
2086
hookdir_fd = -1;
2087
}
2088
close(devnull);
1581
2089
}
1582
2090
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;
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2095
int ret;
1589
2096
struct ifreq network;
1590
2097
unsigned int if_index = if_nametoindex(interface);
1591
2098
if(if_index == 0){
1600
2107
}
1601
2108
1602
2109
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
1604
2113
ret_errno = errno;
1605
2114
fprintf_plus(stderr, "Failed to get flags for interface "
1606
2115
"\"%s\"\n", interface);
2116
errno = old_errno;
1607
2117
return ret_errno;
1608
2118
}
1609
network.ifr_flags |= IFF_UP;
2119
network.ifr_flags |= IFF_UP; /* set flag */
1610
2120
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2122
if(sd == -1){
1613
2123
ret_errno = errno;
1614
2124
perror_plus("socket");
1615
2125
errno = old_errno;
1616
2126
return ret_errno;
1617
2127
}
1618
2128
1619
2129
if(quit_now){
1620
close(sd);
2130
ret = close(sd);
2131
if(ret == -1){
2132
perror_plus("close");
2133
}
1621
2134
errno = old_errno;
1622
2135
return EINTR;
1623
2136
}
1627
2140
interface);
1628
2141
}
1629
2142
1630
/* Raise priviliges */
1631
raise_privileges();
2143
/* Raise privileges */
2144
ret_errno = raise_privileges();
2145
if(ret_errno != 0){
2146
errno = ret_errno;
2147
perror_plus("Failed to raise privileges");
2148
}
1632
2149
1633
2150
#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");
2151
int ret_linux;
2152
bool restore_loglevel = false;
2153
if(ret_errno == 0){
2154
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2155
messages about the network interface to mess up the prompt */
2156
ret_linux = klogctl(8, NULL, 5);
2157
if(ret_linux == -1){
2158
perror_plus("klogctl");
2159
} else {
2160
restore_loglevel = true;
2161
}
1641
2162
}
1642
2163
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
1645
2166
#ifdef __linux__
1646
2167
if(restore_loglevel){
1647
2168
ret_linux = klogctl(7, NULL, 0);
1651
2172
}
1652
2173
#endif /* __linux__ */
1653
2174
1654
/* Lower privileges */
1655
lower_privileges();
2175
/* If raise_privileges() succeeded above */
2176
if(ret_errno == 0){
2177
/* Lower privileges */
2178
ret_errno = lower_privileges();
2179
if(ret_errno != 0){
2180
errno = ret_errno;
2181
perror_plus("Failed to lower privileges");
2182
}
2183
}
1656
2184
1657
2185
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2186
ret = close(sd);
1659
2187
if(ret == -1){
1660
2188
perror_plus("close");
1661
2189
}
1662
2190
1663
2191
if(ret_setflags == -1){
1664
errno = ret_errno;
2192
errno = ioctl_errno;
1665
2193
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
2194
errno = old_errno;
1667
return ret_errno;
2195
return ioctl_errno;
1668
2196
}
1669
2197
} else if(debug){
1670
2198
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1673
2201
1674
2202
/* Sleep checking until interface is running.
1675
2203
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
2204
for(int i = 0; i < delay * 4; i++){
1677
2205
if(interface_is_running(interface)){
1678
2206
break;
1679
2207
}
1688
2216
return 0;
1689
2217
}
1690
2218
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;
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
1696
2222
struct ifreq network;
1697
2223
unsigned int if_index = if_nametoindex(interface);
1698
2224
if(if_index == 0){
1701
2227
return ENXIO;
1702
2228
}
1703
2229
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
1704
2232
if(not get_flags(interface, &network) and debug){
1705
2233
ret_errno = errno;
1706
2234
fprintf_plus(stderr, "Failed to get flags for interface "
1707
2235
"\"%s\"\n", interface);
2236
errno = old_errno;
1708
2237
return ret_errno;
1709
2238
}
1710
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
2240
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
2241
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2242
if(sd == -1){
1714
2243
ret_errno = errno;
1715
2244
perror_plus("socket");
1716
2245
errno = old_errno;
1722
2251
interface);
1723
2252
}
1724
2253
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();
2254
/* Raise privileges */
2255
ret_errno = raise_privileges();
2256
if(ret_errno != 0){
2257
errno = ret_errno;
2258
perror_plus("Failed to raise privileges");
2259
}
2260
2261
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
2263
2264
/* If raise_privileges() succeeded above */
2265
if(ret_errno == 0){
2266
/* Lower privileges */
2267
ret_errno = lower_privileges();
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("Failed to lower privileges");
2271
}
2272
}
1733
2273
1734
2274
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2275
int ret = close(sd);
1736
2276
if(ret == -1){
1737
2277
perror_plus("close");
1738
2278
}
1739
2279
1740
2280
if(ret_setflags == -1){
1741
errno = ret_errno;
2281
errno = ioctl_errno;
1742
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
2283
errno = old_errno;
1744
return ret_errno;
2284
return ioctl_errno;
1745
2285
}
1746
2286
} else if(debug){
1747
2287
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1753
2293
}
1754
2294
1755
2295
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 };
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
1759
2301
AvahiSServiceBrowser *sb = NULL;
1760
2302
error_t ret_errno;
1761
2303
int ret;
1762
2304
intmax_t tmpmax;
1763
2305
char *tmp;
1764
2306
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
2307
char *interfaces_to_take_down = NULL;
1768
2308
size_t interfaces_to_take_down_size = 0;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
2309
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2310
char old_tempdir[] = "/tmp/mandosXXXXXX";
2311
char *tempdir = NULL;
1771
2312
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
2313
const char *seckey = PATHDIR "/" SECKEY;
1773
2314
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
1774
2316
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1776
2317
1777
2318
bool gnutls_initialized = false;
1778
2319
bool gpgme_initialized = false;
1830
2371
.doc = "Bit length of the prime number used in the"
1831
2372
" Diffie-Hellman key exchange",
1832
2373
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
1833
2379
{ .name = "priority", .key = 130,
1834
2380
.arg = "STRING",
1835
2381
.doc = "GnuTLS priority string for the TLS handshake",
1869
2415
connect_to = arg;
1870
2416
break;
1871
2417
case 'i': /* --interface */
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
2418
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2419
arg, (int)',');
1874
2420
if(ret_errno != 0){
1875
2421
argp_error(state, "%s", strerror(ret_errno));
1876
2422
}
1890
2436
}
1891
2437
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1892
2438
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
1893
2442
case 130: /* --priority */
1894
2443
mc.priority = arg;
1895
2444
break;
1935
2484
.args_doc = "",
1936
2485
.doc = "Mandos client -- Get and decrypt"
1937
2486
" passwords from a Mandos server" };
1938
ret = argp_parse(&argp, argc, argv,
1939
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1940
switch(ret){
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
1941
2490
case 0:
1942
2491
break;
1943
2492
case ENOMEM:
1944
2493
default:
1945
errno = ret;
2494
errno = ret_errno;
1946
2495
perror_plus("argp_parse");
1947
2496
exitcode = EX_OSERR;
1948
2497
goto end;
1951
2500
goto end;
1952
2501
}
1953
2502
}
1954
2503
1955
2504
{
1956
2505
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
2506
<https://bugs.debian.org/633582> */
1958
2507
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2512
perror_plus("Failed to raise privileges");
2513
} else {
1961
2514
struct stat st;
1962
2515
1963
2516
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1977
2530
}
1978
2531
}
1979
2532
}
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
2533
close(seckey_fd);
1981
2534
}
1982
2535
}
1983
2536
1984
2537
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
2538
int pubkey_fd = open(pubkey, O_RDONLY);
1986
2539
if(pubkey_fd == -1){
1998
2551
}
1999
2552
}
2000
2553
}
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2002
}
2003
}
2004
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2577
}
2578
}
2579
2005
2580
/* Lower privileges */
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2584
perror_plus("Failed to lower privileges");
2010
2585
}
2011
2586
}
2012
2587
}
2013
2588
2014
/* Remove empty interface names */
2589
/* Remove invalid interface names (except "none") */
2015
2590
{
2016
2591
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2592
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2018
2593
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2594
if(strcmp(interface, "none") != 0
2595
and if_nametoindex(interface) == 0){
2596
if(interface[0] != '\0'){
2021
2597
fprintf_plus(stderr, "Not using nonexisting interface"
2022
2598
" \"%s\"\n", interface);
2023
2599
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2600
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2025
2601
interface = NULL;
2026
2602
}
2027
2603
}
2029
2605
2030
2606
/* Run network hooks */
2031
2607
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2608
if(mc.interfaces != NULL){
2609
interfaces_hooks = malloc(mc.interfaces_size);
2035
2610
if(interfaces_hooks == NULL){
2036
2611
perror_plus("malloc");
2037
2612
goto end;
2038
2613
}
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
}
2614
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2616
}
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
2048
2619
}
2049
2620
2050
2621
if(not debug){
2127
2698
}
2128
2699
2129
2700
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2701
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2132
2703
/* Look for any good interfaces */
2133
2704
ret = scandir(sys_class_net, &direntries, good_interface,
2134
2705
alphasort);
2135
2706
if(ret >= 1){
2136
2707
/* Add all found interfaces to interfaces list */
2137
2708
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2709
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2139
2710
direntries[i]->d_name);
2140
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2141
2713
perror_plus("argz_add");
2714
free(direntries[i]);
2142
2715
continue;
2143
2716
}
2144
2717
if(debug){
2145
2718
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
2719
direntries[i]->d_name);
2147
2720
}
2721
free(direntries[i]);
2148
2722
}
2149
2723
free(direntries);
2150
2724
} else {
2151
free(direntries);
2725
if(ret == 0){
2726
free(direntries);
2727
}
2152
2728
fprintf_plus(stderr, "Could not find a network interface\n");
2153
2729
exitcode = EXIT_FAILURE;
2154
2730
goto end;
2155
2731
}
2156
2732
}
2157
2733
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)){
2734
/* Bring up interfaces which are down, and remove any "none"s */
2735
{
2170
2736
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2737
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2172
2738
interface))){
2739
/* If interface name is "none", stop bringing up interfaces.
2740
Also remove all instances of "none" from the list */
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
while((interface = argz_next(mc.interfaces,
2746
mc.interfaces_size, interface))){
2747
if(strcmp(interface, "none") == 0){
2748
argz_delete(&mc.interfaces, &mc.interfaces_size,
2749
interface);
2750
interface = NULL;
2751
}
2752
}
2753
break;
2754
}
2173
2755
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2756
errno = bring_up_interface(interface, delay);
2175
2757
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2178
perror_plus("Failed to bring up interface");
2758
if(errno != 0){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2179
2761
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2764
interface);
2765
if(errno != 0){
2766
perror_plus("argz_add");
2767
}
2183
2768
}
2184
2769
}
2185
2770
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
2771
if(debug and (interfaces_to_take_down == NULL)){
2190
2772
fprintf_plus(stderr, "No interfaces were brought up\n");
2191
2773
}
2192
2774
}
2193
2775
2776
/* If we only got one interface, explicitly use only that one */
2777
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2778
if(debug){
2779
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2780
mc.interfaces);
2781
}
2782
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2783
}
2784
2194
2785
if(quit_now){
2195
2786
goto end;
2196
2787
}
2197
2788
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2199
2790
if(ret == -1){
2200
2791
fprintf_plus(stderr, "init_gnutls_global failed\n");
2201
2792
exitcode = EX_UNAVAILABLE;
2208
2799
goto end;
2209
2800
}
2210
2801
2211
if(mkdtemp(tempdir) == NULL){
2802
/* Try /run/tmp before /tmp */
2803
tempdir = mkdtemp(run_tempdir);
2804
if(tempdir == NULL and errno == ENOENT){
2805
if(debug){
2806
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2807
run_tempdir, old_tempdir);
2808
}
2809
tempdir = mkdtemp(old_tempdir);
2810
}
2811
if(tempdir == NULL){
2212
2812
perror_plus("mkdtemp");
2213
2813
goto end;
2214
2814
}
2215
tempdir_created = true;
2216
2815
2217
2816
if(quit_now){
2218
2817
goto end;
2254
2853
exitcode = EX_USAGE;
2255
2854
goto end;
2256
2855
}
2257
2856
2258
2857
if(quit_now){
2259
2858
goto end;
2260
2859
}
2290
2889
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
2890
(int)retry_interval);
2292
2891
}
2293
sleep((int)retry_interval);
2892
sleep((unsigned int)retry_interval);
2294
2893
}
2295
2894
2296
if (not quit_now){
2895
if(not quit_now){
2297
2896
exitcode = EXIT_SUCCESS;
2298
2897
}
2299
2898
2315
2914
2316
2915
/* Allocate a new server */
2317
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
2917
&config, NULL, NULL, &ret);
2319
2918
2320
2919
/* Free the Avahi configuration data */
2321
2920
avahi_server_config_free(&config);
2324
2923
/* Check if creating the Avahi server object succeeded */
2325
2924
if(mc.server == NULL){
2326
2925
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
2926
avahi_strerror(ret));
2328
2927
exitcode = EX_UNAVAILABLE;
2329
2928
goto end;
2330
2929
}
2354
2953
if(debug){
2355
2954
fprintf_plus(stderr, "Starting Avahi loop search\n");
2356
2955
}
2357
2956
2358
2957
ret = avahi_loop_with_timeout(simple_poll,
2359
2958
(int)(retry_interval * 1000), &mc);
2360
2959
if(debug){
2365
2964
end:
2366
2965
2367
2966
if(debug){
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2369
2974
}
2370
2975
2371
2976
/* Cleanup things */
2977
free(mc.interfaces);
2978
2372
2979
if(sb != NULL)
2373
2980
avahi_s_service_browser_free(sb);
2374
2981
2380
2987
2381
2988
if(gnutls_initialized){
2382
2989
gnutls_certificate_free_credentials(mc.cred);
2383
gnutls_global_deinit();
2384
2990
gnutls_dh_params_deinit(mc.dh_params);
2385
2991
}
2386
2992
2394
3000
mc.current_server->prev->next = NULL;
2395
3001
while(mc.current_server != NULL){
2396
3002
server *next = mc.current_server->next;
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3006
#endif
3007
free((char *)(mc.current_server->ip));
3008
#ifdef __GNUC__
3009
#pragma GCC diagnostic pop
3010
#endif
2397
3011
free(mc.current_server);
2398
3012
mc.current_server = next;
2399
3013
}
2400
3014
}
2401
3015
2402
/* Re-raise priviliges */
3016
/* Re-raise privileges */
2403
3017
{
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();
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
3021
perror_plus("Failed to raise privileges");
3022
} else {
3023
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3027
3028
/* Take down the network interfaces which were brought up */
3029
{
3030
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to take down interface");
3038
}
3039
}
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3042
" down\n");
3043
}
3044
}
3045
}
3046
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to lower privileges permanently");
3051
}
2429
3052
}
2430
3053
2431
3054
free(interfaces_to_take_down);
2432
3055
free(interfaces_hooks);
2433
3056
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
3059
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
3109
}
3110
2434
3111
/* 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
}
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
2468
3114
}
2469
3115
2470
3116
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0