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- Committer: Teddy Hogeborn
- Date: 2018-02-10 18:47:22 UTC
- Revision ID: teddy@recompile.se-20180210184722-x2qot50xku6qq3mv
Build-depend on debhelper 10
* debian/control (Build-Depends): Change version of debhelper
dependency to ">= 10".
* debian/control (Build-Depends): Change version of debhelper
dependency to ">= 10".
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
180
191
perror(print_text);
181
192
}
182
193
183
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
195
int fprintf_plus(FILE *stream, const char *format, ...){
185
196
va_list ap;
186
197
va_start (ap, format);
187
198
188
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
200
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
202
}
192
203
193
204
/*
195
206
* bytes. "buffer_capacity" is how much is currently allocated,
196
207
* "buffer_length" is how much is already used.
197
208
*/
209
__attribute__((nonnull, warn_unused_result))
198
210
size_t incbuffer(char **buffer, size_t buffer_length,
199
211
size_t buffer_capacity){
200
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
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;
203
219
return 0;
204
220
}
221
*buffer = new_buf;
205
222
buffer_capacity += BUFFER_SIZE;
206
223
}
207
224
return buffer_capacity;
208
225
}
209
226
210
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
211
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
230
int af, server **current_server){
213
231
int ret;
222
240
.af = af };
223
241
if(new_server->ip == NULL){
224
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);
225
258
return false;
226
259
}
227
260
/* Special case of first server */
229
262
new_server->next = new_server;
230
263
new_server->prev = new_server;
231
264
*current_server = new_server;
232
/* Place the new server last in the list */
233
265
} else {
266
/* Place the new server last in the list */
234
267
new_server->next = *current_server;
235
268
new_server->prev = (*current_server)->prev;
236
269
new_server->prev->next = new_server;
237
270
(*current_server)->prev = new_server;
238
271
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
272
return true;
245
273
}
246
274
247
275
/*
248
276
* Initialize GPGME.
249
277
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
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){
252
283
gpgme_error_t rc;
253
284
gpgme_engine_info_t engine_info;
254
285
255
286
/*
256
287
* Helper function to insert pub and seckey to the engine keyring.
257
288
*/
258
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
259
290
int ret;
260
291
int fd;
261
292
gpgme_data_t pgp_data;
280
311
return false;
281
312
}
282
313
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
284
315
if(ret == -1){
285
316
perror_plus("close");
286
317
}
342
373
* Decrypt OpenPGP data.
343
374
* Returns -1 on error
344
375
*/
376
__attribute__((nonnull, warn_unused_result))
345
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
378
size_t crypto_size,
347
379
char **plaintext,
467
499
return plaintext_length;
468
500
}
469
501
470
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){
471
511
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
512
return safe_string(ret);
475
513
}
476
514
477
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
478
517
static void debuggnutls(__attribute__((unused)) int level,
479
518
const char* string){
480
519
fprintf_plus(stderr, "GnuTLS: %s", string);
481
520
}
482
521
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
523
static int init_gnutls_global(const char *pubkeyfilename,
484
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
485
526
mandos_context *mc){
486
527
int ret;
528
unsigned int uret;
487
529
488
530
if(debug){
489
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
490
532
}
491
533
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
499
534
if(debug){
500
535
/* "Use a log level over 10 to enable all debugging options."
501
536
* - GnuTLS manual
509
544
if(ret != GNUTLS_E_SUCCESS){
510
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
546
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
513
547
return -1;
514
548
}
515
549
540
574
safer_gnutls_strerror(ret));
541
575
goto globalfail;
542
576
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
if(params.data == NULL){
617
dhparamsfilename = NULL;
618
}
619
if(dhparamsfilename == NULL){
620
break;
621
}
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
629
}
630
free(params.data);
631
} while(false);
632
}
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
do {
639
int secfile = open(seckeyfilename, O_RDONLY);
640
if(secfile == -1){
641
perror_plus("open");
642
break;
643
}
644
size_t buffer_capacity = 0;
645
while(true){
646
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer.size,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
651
free(buffer.data);
652
buffer.data = NULL;
653
break;
654
}
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
657
BUFFER_SIZE);
658
/* EOF */
659
if(bytes_read == 0){
660
break;
661
}
662
/* check bytes_read for failure */
663
if(bytes_read < 0){
664
perror_plus("read");
665
free(buffer.data);
666
buffer.data = NULL;
667
break;
668
}
669
buffer.size += (unsigned int)bytes_read;
670
}
671
close(secfile);
672
} while(false);
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
676
{
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
" structure: %s",
682
safer_gnutls_strerror(ret));
683
free(buffer.data);
684
buffer.data = NULL;
685
} else {
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
691
privkey = NULL;
692
}
693
free(buffer.data);
694
buffer.data = NULL;
695
if(privkey != NULL){
696
/* Use private key to suggest an appropriate
697
sec_param */
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
700
if(debug){
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
704
(sec_param)));
705
}
706
}
707
}
708
}
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
if(debug){
713
fprintf_plus(stderr, "Falling back to security parameter"
714
" \"%s\"\n",
715
safe_string(gnutls_sec_param_get_name
716
(sec_param)));
717
}
718
}
719
}
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
if(uret != 0){
722
mc->dh_bits = uret;
723
if(debug){
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
mc->dh_bits);
729
}
730
} else {
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
734
(sec_param)),
735
safer_gnutls_strerror(ret));
736
goto globalfail;
737
}
738
} else if(debug){
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
mc->dh_bits);
741
}
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
747
goto globalfail;
748
}
749
}
550
750
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
551
751
552
752
return 0;
554
754
globalfail:
555
755
556
756
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
558
757
gnutls_dh_params_deinit(mc->dh_params);
559
758
return -1;
560
759
}
561
760
761
__attribute__((nonnull, warn_unused_result))
562
762
static int init_gnutls_session(gnutls_session_t *session,
563
763
mandos_context *mc){
564
764
int ret;
611
811
/* ignore client certificate if any. */
612
812
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
813
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
616
814
return 0;
617
815
}
618
816
620
818
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
819
__attribute__((unused)) const char *txt){}
622
820
821
/* Set effective uid to 0, return errno */
822
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
826
if(seteuid(0) == -1){
827
ret = errno;
828
}
829
errno = old_errno;
830
return ret;
831
}
832
833
/* Set effective and real user ID to 0. Return errno. */
834
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
839
errno = old_errno;
840
return ret;
841
}
842
if(setuid(0) == -1){
843
ret = errno;
844
}
845
errno = old_errno;
846
return ret;
847
}
848
849
/* Set effective user ID to unprivileged saved user ID */
850
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
854
if(seteuid(uid) == -1){
855
ret = errno;
856
}
857
errno = old_errno;
858
return ret;
859
}
860
861
/* Lower privileges permanently */
862
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
866
if(setuid(uid) == -1){
867
ret = errno;
868
}
869
errno = old_errno;
870
return ret;
871
}
872
873
/* Helper function to add_local_route() and delete_local_route() */
874
__attribute__((nonnull, warn_unused_result))
875
static bool add_delete_local_route(const bool add,
876
const char *address,
877
AvahiIfIndex if_index){
878
int ret;
879
char helper[] = "mandos-client-iprouteadddel";
880
char add_arg[] = "add";
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
884
if(pluginhelperdir == NULL){
885
if(debug){
886
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
887
" variable not set; cannot run helper\n");
888
}
889
return false;
890
}
891
892
char interface[IF_NAMESIZE];
893
if(if_indextoname((unsigned int)if_index, interface) == NULL){
894
perror_plus("if_indextoname");
895
return false;
896
}
897
898
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
if(devnull == -1){
900
perror_plus("open(\"/dev/null\", O_RDONLY)");
901
return false;
902
}
903
pid_t pid = fork();
904
if(pid == 0){
905
/* Child */
906
/* Raise privileges */
907
errno = raise_privileges_permanently();
908
if(errno != 0){
909
perror_plus("Failed to raise privileges");
910
/* _exit(EX_NOPERM); */
911
} else {
912
/* Set group */
913
errno = 0;
914
ret = setgid(0);
915
if(ret == -1){
916
perror_plus("setgid");
917
_exit(EX_NOPERM);
918
}
919
/* Reset supplementary groups */
920
errno = 0;
921
ret = setgroups(0, NULL);
922
if(ret == -1){
923
perror_plus("setgroups");
924
_exit(EX_NOPERM);
925
}
926
}
927
ret = dup2(devnull, STDIN_FILENO);
928
if(ret == -1){
929
perror_plus("dup2(devnull, STDIN_FILENO)");
930
_exit(EX_OSERR);
931
}
932
ret = close(devnull);
933
if(ret == -1){
934
perror_plus("close");
935
_exit(EX_OSERR);
936
}
937
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
if(ret == -1){
939
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
_exit(EX_OSERR);
941
}
942
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
943
O_RDONLY
944
| O_DIRECTORY
945
| O_PATH
946
| O_CLOEXEC));
947
if(helperdir_fd == -1){
948
perror_plus("open");
949
_exit(EX_UNAVAILABLE);
950
}
951
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
helper, O_RDONLY));
953
if(helper_fd == -1){
954
perror_plus("openat");
955
close(helperdir_fd);
956
_exit(EX_UNAVAILABLE);
957
}
958
close(helperdir_fd);
959
#ifdef __GNUC__
960
#pragma GCC diagnostic push
961
#pragma GCC diagnostic ignored "-Wcast-qual"
962
#endif
963
if(fexecve(helper_fd, (char *const [])
964
{ helper, add ? add_arg : delete_arg, (char *)address,
965
interface, debug ? debug_flag : NULL, NULL },
966
environ) == -1){
967
#ifdef __GNUC__
968
#pragma GCC diagnostic pop
969
#endif
970
perror_plus("fexecve");
971
_exit(EXIT_FAILURE);
972
}
973
}
974
if(pid == -1){
975
perror_plus("fork");
976
return false;
977
}
978
int status;
979
pid_t pret = -1;
980
errno = 0;
981
do {
982
pret = waitpid(pid, &status, 0);
983
if(pret == -1 and errno == EINTR and quit_now){
984
int errno_raising = 0;
985
if((errno = raise_privileges()) != 0){
986
errno_raising = errno;
987
perror_plus("Failed to raise privileges in order to"
988
" kill helper program");
989
}
990
if(kill(pid, SIGTERM) == -1){
991
perror_plus("kill");
992
}
993
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
994
perror_plus("Failed to lower privileges after killing"
995
" helper program");
996
}
997
return false;
998
}
999
} while(pret == -1 and errno == EINTR);
1000
if(pret == -1){
1001
perror_plus("waitpid");
1002
return false;
1003
}
1004
if(WIFEXITED(status)){
1005
if(WEXITSTATUS(status) != 0){
1006
fprintf_plus(stderr, "Error: iprouteadddel exited"
1007
" with status %d\n", WEXITSTATUS(status));
1008
return false;
1009
}
1010
return true;
1011
}
1012
if(WIFSIGNALED(status)){
1013
fprintf_plus(stderr, "Error: iprouteadddel died by"
1014
" signal %d\n", WTERMSIG(status));
1015
return false;
1016
}
1017
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
return false;
1019
}
1020
1021
__attribute__((nonnull, warn_unused_result))
1022
static bool add_local_route(const char *address,
1023
AvahiIfIndex if_index){
1024
if(debug){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
}
1027
return add_delete_local_route(true, address, if_index);
1028
}
1029
1030
__attribute__((nonnull, warn_unused_result))
1031
static bool delete_local_route(const char *address,
1032
AvahiIfIndex if_index){
1033
if(debug){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
}
1036
return add_delete_local_route(false, address, if_index);
1037
}
1038
623
1039
/* Called when a Mandos server is found */
1040
__attribute__((nonnull, warn_unused_result))
624
1041
static int start_mandos_communication(const char *ip, in_port_t port,
625
1042
AvahiIfIndex if_index,
626
1043
int af, mandos_context *mc){
627
1044
int ret, tcp_sd = -1;
628
1045
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1046
struct sockaddr_storage to;
633
1047
char *buffer = NULL;
634
1048
char *decrypted_buffer = NULL;
635
1049
size_t buffer_length = 0;
638
1052
int retval = -1;
639
1053
gnutls_session_t session;
640
1054
int pf; /* Protocol family */
1055
bool route_added = false;
641
1056
642
1057
errno = 0;
643
1058
665
1080
bool match = false;
666
1081
{
667
1082
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
670
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
671
1087
match = true;
672
1088
break;
701
1117
PRIuMAX "\n", ip, (uintmax_t)port);
702
1118
}
703
1119
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
705
1121
if(tcp_sd < 0){
706
1122
int e = errno;
707
1123
perror_plus("socket");
714
1130
goto mandos_end;
715
1131
}
716
1132
717
memset(&to, 0, sizeof(to));
718
1133
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
721
1137
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
724
1141
}
725
1142
if(ret < 0 ){
726
1143
int e = errno;
735
1152
goto mandos_end;
736
1153
}
737
1154
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
742
1158
if(if_index == AVAHI_IF_UNSPEC){
743
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
744
1160
" incomplete without a network interface\n");
746
1162
goto mandos_end;
747
1163
}
748
1164
/* Set the network interface number as scope */
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
750
1166
}
751
1167
} else {
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
755
1169
}
756
1170
757
1171
if(quit_now){
774
1188
}
775
1189
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
1190
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
777
const char *pcret;
778
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
781
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
784
}
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
787
} else {
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
790
}
791
}
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
799
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
801
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
803
}
804
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
int e = errno;
807
perror_plus("connect");
808
errno = e;
809
}
810
goto mandos_end;
811
}
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
816
1271
}
817
1272
818
1273
const char *out = mandos_protocol_version;
972
1427
&decrypted_buffer, mc);
973
1428
if(decrypted_buffer_size >= 0){
974
1429
1430
clearerr(stdout);
975
1431
written = 0;
976
1432
while(written < (size_t) decrypted_buffer_size){
977
1433
if(quit_now){
993
1449
}
994
1450
written += (size_t)ret;
995
1451
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
996
1462
retval = 0;
997
1463
}
998
1464
}
1001
1467
1002
1468
mandos_end:
1003
1469
{
1470
if(route_added){
1471
if(not delete_local_route(ip, if_index)){
1472
fprintf_plus(stderr, "Failed to delete local route to %s on"
1473
" interface %d", ip, if_index);
1474
}
1475
}
1004
1476
int e = errno;
1005
1477
free(decrypted_buffer);
1006
1478
free(buffer);
1007
1479
if(tcp_sd >= 0){
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
ret = close(tcp_sd);
1009
1481
}
1010
1482
if(ret == -1){
1011
1483
if(e == 0){
1036
1508
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1509
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1510
flags,
1039
void* mc){
1511
void *mc){
1040
1512
if(r == NULL){
1041
1513
return;
1042
1514
}
1045
1517
timed out */
1046
1518
1047
1519
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1048
1521
return;
1049
1522
}
1050
1523
1095
1568
const char *domain,
1096
1569
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1570
flags,
1098
void* mc){
1571
void *mc){
1099
1572
if(b == NULL){
1100
1573
return;
1101
1574
}
1161
1634
errno = old_errno;
1162
1635
}
1163
1636
1637
__attribute__((nonnull, warn_unused_result))
1164
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1639
int ret;
1166
error_t ret_errno;
1640
int old_errno;
1167
1641
1168
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1643
if(s < 0){
1170
ret_errno = errno;
1644
old_errno = errno;
1171
1645
perror_plus("socket");
1172
errno = ret_errno;
1646
errno = old_errno;
1173
1647
return false;
1174
1648
}
1175
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1176
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1652
if(ret == -1){
1178
1653
if(debug){
1179
ret_errno = errno;
1654
old_errno = errno;
1180
1655
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1656
errno = old_errno;
1182
1657
}
1183
1658
return false;
1184
1659
}
1185
1660
return true;
1186
1661
}
1187
1662
1663
__attribute__((nonnull, warn_unused_result))
1188
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1189
1665
1190
1666
/* Reject the loopback device */
1232
1708
* corresponds to an acceptable network device.
1233
1709
* (This function is passed to scandir(3) as a filter function.)
1234
1710
*/
1711
__attribute__((nonnull, warn_unused_result))
1235
1712
int good_interface(const struct dirent *if_entry){
1236
1713
if(if_entry->d_name[0] == '.'){
1237
1714
return 0;
1255
1732
/*
1256
1733
* This function determines if a network interface is up.
1257
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1258
1736
bool interface_is_up(const char *interface){
1259
1737
struct ifreq ifr;
1260
1738
if(not get_flags(interface, &ifr)){
1271
1749
/*
1272
1750
* This function determines if a network interface is running
1273
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1274
1753
bool interface_is_running(const char *interface){
1275
1754
struct ifreq ifr;
1276
1755
if(not get_flags(interface, &ifr)){
1284
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1285
1764
}
1286
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1287
1767
int notdotentries(const struct dirent *direntry){
1288
1768
/* Skip "." and ".." */
1289
1769
if(direntry->d_name[0] == '.'
1296
1776
}
1297
1777
1298
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1299
1780
int runnable_hook(const struct dirent *direntry){
1300
1781
int ret;
1301
1782
size_t sret;
1309
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
1791
"abcdefghijklmnopqrstuvwxyz"
1311
1792
"0123456789"
1312
"_-");
1793
"_.-");
1313
1794
if((direntry->d_name)[sret] != '\0'){
1314
1795
/* Contains non-allowed characters */
1315
1796
if(debug){
1319
1800
return 0;
1320
1801
}
1321
1802
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1330
1804
if(ret == -1){
1331
1805
if(debug){
1332
1806
perror_plus("Could not stat hook");
1356
1830
return 1;
1357
1831
}
1358
1832
1833
__attribute__((nonnull, warn_unused_result))
1359
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
1835
mandos_context *mc){
1361
1836
int ret;
1365
1840
1366
1841
while(true){
1367
1842
if(mc->current_server == NULL){
1368
if (debug){
1843
if(debug){
1369
1844
fprintf_plus(stderr, "Wait until first server is found."
1370
1845
" No timeout!\n");
1371
1846
}
1372
1847
ret = avahi_simple_poll_iterate(s, -1);
1373
1848
} else {
1374
if (debug){
1849
if(debug){
1375
1850
fprintf_plus(stderr, "Check current_server if we should run"
1376
1851
" it, or wait\n");
1377
1852
}
1394
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1395
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1871
1397
if (debug){
1872
if(debug){
1398
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
1874
block_time);
1400
1875
}
1422
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
1898
}
1424
1899
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1900
if(ret > 0 or errno != EINTR){
1426
1901
return (ret != 1) ? ret : 0;
1427
1902
}
1428
1903
}
1429
1904
}
1430
1905
}
1431
1906
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1485
1909
const float delay){
1486
struct dirent **direntries;
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1928
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1487
1932
struct dirent *direntry;
1488
1933
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1491
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1499
1944
}
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1507
1991
perror_plus("asprintf");
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1566
1996
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
1578
2065
} else {
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
1615
2085
}
1616
2086
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2091
int ret;
1623
2092
struct ifreq network;
1624
2093
unsigned int if_index = if_nametoindex(interface);
1625
2094
if(if_index == 0){
1634
2103
}
1635
2104
1636
2105
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
1638
2109
ret_errno = errno;
1639
2110
fprintf_plus(stderr, "Failed to get flags for interface "
1640
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
1641
2113
return ret_errno;
1642
2114
}
1643
network.ifr_flags |= IFF_UP;
2115
network.ifr_flags |= IFF_UP; /* set flag */
1644
2116
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
1647
2119
ret_errno = errno;
1648
2120
perror_plus("socket");
1649
2121
errno = old_errno;
1650
2122
return ret_errno;
1651
2123
}
1652
2124
1653
2125
if(quit_now){
1654
close(sd);
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
1655
2130
errno = old_errno;
1656
2131
return EINTR;
1657
2132
}
1661
2136
interface);
1662
2137
}
1663
2138
1664
/* Raise priviliges */
1665
raise_privileges();
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
1666
2145
1667
2146
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
1675
2158
}
1676
2159
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
1679
2162
#ifdef __linux__
1680
2163
if(restore_loglevel){
1681
2164
ret_linux = klogctl(7, NULL, 0);
1685
2168
}
1686
2169
#endif /* __linux__ */
1687
2170
1688
/* Lower privileges */
1689
lower_privileges();
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
1690
2180
1691
2181
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
ret = close(sd);
1693
2183
if(ret == -1){
1694
2184
perror_plus("close");
1695
2185
}
1696
2186
1697
2187
if(ret_setflags == -1){
1698
errno = ret_errno;
2188
errno = ioctl_errno;
1699
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
2190
errno = old_errno;
1701
return ret_errno;
2191
return ioctl_errno;
1702
2192
}
1703
2193
} else if(debug){
1704
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1707
2197
1708
2198
/* Sleep checking until interface is running.
1709
2199
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
2200
for(int i = 0; i < delay * 4; i++){
1711
2201
if(interface_is_running(interface)){
1712
2202
break;
1713
2203
}
1722
2212
return 0;
1723
2213
}
1724
2214
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
1730
2218
struct ifreq network;
1731
2219
unsigned int if_index = if_nametoindex(interface);
1732
2220
if(if_index == 0){
1735
2223
return ENXIO;
1736
2224
}
1737
2225
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
1738
2228
if(not get_flags(interface, &network) and debug){
1739
2229
ret_errno = errno;
1740
2230
fprintf_plus(stderr, "Failed to get flags for interface "
1741
2231
"\"%s\"\n", interface);
2232
errno = old_errno;
1742
2233
return ret_errno;
1743
2234
}
1744
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
2236
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
1748
2239
ret_errno = errno;
1749
2240
perror_plus("socket");
1750
2241
errno = old_errno;
1756
2247
interface);
1757
2248
}
1758
2249
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2252
if(ret_errno != 0){
2253
errno = ret_errno;
2254
perror_plus("Failed to raise privileges");
2255
}
2256
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2259
2260
/* If raise_privileges() succeeded above */
2261
if(ret_errno == 0){
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
1767
2269
1768
2270
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
int ret = close(sd);
1770
2272
if(ret == -1){
1771
2273
perror_plus("close");
1772
2274
}
1773
2275
1774
2276
if(ret_setflags == -1){
1775
errno = ret_errno;
2277
errno = ioctl_errno;
1776
2278
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
2279
errno = old_errno;
1778
return ret_errno;
2280
return ioctl_errno;
1779
2281
}
1780
2282
} else if(debug){
1781
2283
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
2289
}
1788
2290
1789
2291
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1794
2297
AvahiSServiceBrowser *sb = NULL;
1795
2298
error_t ret_errno;
1796
2299
int ret;
1799
2302
int exitcode = EXIT_SUCCESS;
1800
2303
char *interfaces_to_take_down = NULL;
1801
2304
size_t interfaces_to_take_down_size = 0;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1804
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
2309
const char *seckey = PATHDIR "/" SECKEY;
1806
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
1807
2312
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
2313
1810
2314
bool gnutls_initialized = false;
1811
2315
bool gpgme_initialized = false;
1863
2367
.doc = "Bit length of the prime number used in the"
1864
2368
" Diffie-Hellman key exchange",
1865
2369
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
1866
2375
{ .name = "priority", .key = 130,
1867
2376
.arg = "STRING",
1868
2377
.doc = "GnuTLS priority string for the TLS handshake",
1923
2432
}
1924
2433
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1925
2434
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
1926
2438
case 130: /* --priority */
1927
2439
mc.priority = arg;
1928
2440
break;
1968
2480
.args_doc = "",
1969
2481
.doc = "Mandos client -- Get and decrypt"
1970
2482
" passwords from a Mandos server" };
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1974
2486
case 0:
1975
2487
break;
1976
2488
case ENOMEM:
1977
2489
default:
1978
errno = ret;
2490
errno = ret_errno;
1979
2491
perror_plus("argp_parse");
1980
2492
exitcode = EX_OSERR;
1981
2493
goto end;
1984
2496
goto end;
1985
2497
}
1986
2498
}
1987
2499
1988
2500
{
1989
2501
/* Work around Debian bug #633582:
1990
<http://bugs.debian.org/633582> */
2502
<https://bugs.debian.org/633582> */
1991
2503
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
2509
} else {
1994
2510
struct stat st;
1995
2511
1996
2512
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2010
2526
}
2011
2527
}
2012
2528
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
close(seckey_fd);
2014
2530
}
2015
2531
}
2016
2532
2017
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
2534
int pubkey_fd = open(pubkey, O_RDONLY);
2019
2535
if(pubkey_fd == -1){
2031
2547
}
2032
2548
}
2033
2549
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
2038
2576
/* Lower privileges */
2039
lower_privileges();
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
2581
}
2040
2582
}
2041
2583
}
2042
2584
2066
2608
goto end;
2067
2609
}
2068
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
}
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
2077
2615
}
2078
2616
2079
2617
if(not debug){
2157
2695
2158
2696
/* If no interfaces were specified, make a list */
2159
2697
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2698
struct dirent **direntries = NULL;
2161
2699
/* Look for any good interfaces */
2162
2700
ret = scandir(sys_class_net, &direntries, good_interface,
2163
2701
alphasort);
2167
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
2706
direntries[i]->d_name);
2169
2707
if(ret_errno != 0){
2708
errno = ret_errno;
2170
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2171
2711
continue;
2172
2712
}
2173
2713
if(debug){
2174
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
2715
direntries[i]->d_name);
2176
2716
}
2717
free(direntries[i]);
2177
2718
}
2178
2719
free(direntries);
2179
2720
} else {
2180
free(direntries);
2721
if(ret == 0){
2722
free(direntries);
2723
}
2181
2724
fprintf_plus(stderr, "Could not find a network interface\n");
2182
2725
exitcode = EXIT_FAILURE;
2183
2726
goto end;
2206
2749
break;
2207
2750
}
2208
2751
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2752
errno = bring_up_interface(interface, delay);
2210
2753
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2214
2757
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2218
2764
}
2219
2765
}
2220
2766
}
2236
2782
goto end;
2237
2783
}
2238
2784
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2240
2786
if(ret == -1){
2241
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
2788
exitcode = EX_UNAVAILABLE;
2249
2795
goto end;
2250
2796
}
2251
2797
2252
if(mkdtemp(tempdir) == NULL){
2798
/* Try /run/tmp before /tmp */
2799
tempdir = mkdtemp(run_tempdir);
2800
if(tempdir == NULL and errno == ENOENT){
2801
if(debug){
2802
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2803
run_tempdir, old_tempdir);
2804
}
2805
tempdir = mkdtemp(old_tempdir);
2806
}
2807
if(tempdir == NULL){
2253
2808
perror_plus("mkdtemp");
2254
2809
goto end;
2255
2810
}
2256
tempdir_created = true;
2257
2811
2258
2812
if(quit_now){
2259
2813
goto end;
2331
2885
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
2886
(int)retry_interval);
2333
2887
}
2334
sleep((int)retry_interval);
2888
sleep((unsigned int)retry_interval);
2335
2889
}
2336
2890
2337
if (not quit_now){
2891
if(not quit_now){
2338
2892
exitcode = EXIT_SUCCESS;
2339
2893
}
2340
2894
2356
2910
2357
2911
/* Allocate a new server */
2358
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2913
&config, NULL, NULL, &ret);
2360
2914
2361
2915
/* Free the Avahi configuration data */
2362
2916
avahi_server_config_free(&config);
2365
2919
/* Check if creating the Avahi server object succeeded */
2366
2920
if(mc.server == NULL){
2367
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2922
avahi_strerror(ret));
2369
2923
exitcode = EX_UNAVAILABLE;
2370
2924
goto end;
2371
2925
}
2395
2949
if(debug){
2396
2950
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
2951
}
2398
2952
2399
2953
ret = avahi_loop_with_timeout(simple_poll,
2400
2954
(int)(retry_interval * 1000), &mc);
2401
2955
if(debug){
2406
2960
end:
2407
2961
2408
2962
if(debug){
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2410
2970
}
2411
2971
2412
2972
/* Cleanup things */
2423
2983
2424
2984
if(gnutls_initialized){
2425
2985
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
2427
2986
gnutls_dh_params_deinit(mc.dh_params);
2428
2987
}
2429
2988
2437
2996
mc.current_server->prev->next = NULL;
2438
2997
while(mc.current_server != NULL){
2439
2998
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
2440
3007
free(mc.current_server);
2441
3008
mc.current_server = next;
2442
3009
}
2443
3010
}
2444
3011
2445
/* Re-raise priviliges */
3012
/* Re-raise privileges */
2446
3013
{
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3017
perror_plus("Failed to raise privileges");
3018
} else {
3019
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3023
3024
/* Take down the network interfaces which were brought up */
3025
{
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3033
perror_plus("Failed to take down interface");
3034
}
3035
}
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3038
" down\n");
3039
}
3040
}
3041
}
3042
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
3047
}
2472
3048
}
2473
3049
2474
3050
free(interfaces_to_take_down);
2475
3051
free(interfaces_hooks);
2476
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
2477
3109
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
2479
struct dirent **direntries = NULL;
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
2484
for(int i = 0; i < numentries; i++){
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2499
}
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2510
}
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2511
3112
}
2512
3113
2513
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0