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237.7.181
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2013-10-22 19:46:35 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 305.
- Revision ID: teddy@recompile.se-20131022194635-ll6jyg1snrxwe94o
* TODO
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
56
55
opendir(), DIR */
57
56
#include <sys/stat.h> /* open(), S_ISREG */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
61
*/
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
63
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
64
#include <errno.h> /* perror(), errno,
71
65
program_invocation_short_name */
72
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
78
72
*/
79
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
74
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
84
77
#include <iso646.h> /* not, or, and */
85
78
#include <argp.h> /* struct argp_option, error_t, struct
86
79
argp_state, struct argp,
98
91
argz_delete(), argz_append(),
99
92
argz_stringify(), argz_add(),
100
93
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
103
94
104
95
#ifdef __linux__
105
96
#include <sys/klog.h> /* klogctl() */
147
138
static const char sys_class_net[] = "/sys/class/net";
148
139
char *connect_to = NULL;
149
140
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
141
uid_t uid = 65534;
152
142
gid_t gid = 65534;
153
143
190
180
perror(print_text);
191
181
}
192
182
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
194
184
int fprintf_plus(FILE *stream, const char *format, ...){
195
185
va_list ap;
196
186
va_start (ap, format);
205
195
* bytes. "buffer_capacity" is how much is currently allocated,
206
196
* "buffer_length" is how much is already used.
207
197
*/
208
__attribute__((nonnull, warn_unused_result))
209
198
size_t incbuffer(char **buffer, size_t buffer_length,
210
199
size_t buffer_capacity){
211
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
218
203
return 0;
219
204
}
220
*buffer = new_buf;
221
205
buffer_capacity += BUFFER_SIZE;
222
206
}
223
207
return buffer_capacity;
224
208
}
225
209
226
210
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
212
int af, server **current_server){
230
213
int ret;
239
222
.af = af };
240
223
if(new_server->ip == NULL){
241
224
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
225
return false;
258
226
}
259
227
/* Special case of first server */
261
229
new_server->next = new_server;
262
230
new_server->prev = new_server;
263
231
*current_server = new_server;
232
/* Place the new server last in the list */
264
233
} else {
265
/* Place the new server last in the list */
266
234
new_server->next = *current_server;
267
235
new_server->prev = (*current_server)->prev;
268
236
new_server->prev->next = new_server;
269
237
(*current_server)->prev = new_server;
270
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
271
244
return true;
272
245
}
273
246
274
247
/*
275
248
* Initialize GPGME.
276
249
*/
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
282
252
gpgme_error_t rc;
283
253
gpgme_engine_info_t engine_info;
284
254
285
255
/*
286
256
* Helper function to insert pub and seckey to the engine keyring.
287
257
*/
288
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
289
259
int ret;
290
260
int fd;
291
261
gpgme_data_t pgp_data;
310
280
return false;
311
281
}
312
282
313
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
284
if(ret == -1){
315
285
perror_plus("close");
316
286
}
372
342
* Decrypt OpenPGP data.
373
343
* Returns -1 on error
374
344
*/
375
__attribute__((nonnull, warn_unused_result))
376
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
377
346
size_t crypto_size,
378
347
char **plaintext,
498
467
return plaintext_length;
499
468
}
500
469
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
510
471
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
512
475
}
513
476
514
477
/* GnuTLS log function callback */
515
__attribute__((nonnull))
516
478
static void debuggnutls(__attribute__((unused)) int level,
517
479
const char* string){
518
480
fprintf_plus(stderr, "GnuTLS: %s", string);
519
481
}
520
482
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
483
static int init_gnutls_global(const char *pubkeyfilename,
523
484
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
485
mandos_context *mc){
526
486
int ret;
527
unsigned int uret;
528
487
529
488
if(debug){
530
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
490
}
532
491
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
533
499
if(debug){
534
500
/* "Use a log level over 10 to enable all debugging options."
535
501
* - GnuTLS manual
543
509
if(ret != GNUTLS_E_SUCCESS){
544
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
546
513
return -1;
547
514
}
548
515
573
540
safer_gnutls_strerror(ret));
574
541
goto globalfail;
575
542
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
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
749
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
750
551
751
552
return 0;
753
554
globalfail:
754
555
755
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
756
558
gnutls_dh_params_deinit(mc->dh_params);
757
559
return -1;
758
560
}
759
561
760
__attribute__((nonnull, warn_unused_result))
761
562
static int init_gnutls_session(gnutls_session_t *session,
762
563
mandos_context *mc){
763
564
int ret;
810
611
/* ignore client certificate if any. */
811
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
813
616
return 0;
814
617
}
815
618
817
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
621
__attribute__((unused)) const char *txt){}
819
622
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
1038
623
/* Called when a Mandos server is found */
1039
__attribute__((nonnull, warn_unused_result))
1040
624
static int start_mandos_communication(const char *ip, in_port_t port,
1041
625
AvahiIfIndex if_index,
1042
626
int af, mandos_context *mc){
1043
627
int ret, tcp_sd = -1;
1044
628
ssize_t sret;
1045
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1046
633
char *buffer = NULL;
1047
634
char *decrypted_buffer = NULL;
1048
635
size_t buffer_length = 0;
1051
638
int retval = -1;
1052
639
gnutls_session_t session;
1053
640
int pf; /* Protocol family */
1054
bool route_added = false;
1055
641
1056
642
errno = 0;
1057
643
1079
665
bool match = false;
1080
666
{
1081
667
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1085
670
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
671
match = true;
1087
672
break;
1116
701
PRIuMAX "\n", ip, (uintmax_t)port);
1117
702
}
1118
703
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
705
if(tcp_sd < 0){
1121
706
int e = errno;
1122
707
perror_plus("socket");
1129
714
goto mandos_end;
1130
715
}
1131
716
717
memset(&to, 0, sizeof(to));
1132
718
if(af == AF_INET6){
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1136
721
} else { /* IPv4 */
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1140
724
}
1141
725
if(ret < 0 ){
1142
726
int e = errno;
1151
735
goto mandos_end;
1152
736
}
1153
737
if(af == AF_INET6){
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
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*/
1157
742
if(if_index == AVAHI_IF_UNSPEC){
1158
743
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
744
" incomplete without a network interface\n");
1161
746
goto mandos_end;
1162
747
}
1163
748
/* Set the network interface number as scope */
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
750
}
1166
751
} else {
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1168
755
}
1169
756
1170
757
if(quit_now){
1187
774
}
1188
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1189
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
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;
1270
816
}
1271
817
1272
818
const char *out = mandos_protocol_version;
1426
972
&decrypted_buffer, mc);
1427
973
if(decrypted_buffer_size >= 0){
1428
974
1429
clearerr(stdout);
1430
975
written = 0;
1431
976
while(written < (size_t) decrypted_buffer_size){
1432
977
if(quit_now){
1448
993
}
1449
994
written += (size_t)ret;
1450
995
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
1461
996
retval = 0;
1462
997
}
1463
998
}
1466
1001
1467
1002
mandos_end:
1468
1003
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
1475
1004
int e = errno;
1476
1005
free(decrypted_buffer);
1477
1006
free(buffer);
1478
1007
if(tcp_sd >= 0){
1479
ret = close(tcp_sd);
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
1009
}
1481
1010
if(ret == -1){
1482
1011
if(e == 0){
1494
1023
return retval;
1495
1024
}
1496
1025
1497
__attribute__((nonnull))
1498
1026
static void resolve_callback(AvahiSServiceResolver *r,
1499
1027
AvahiIfIndex interface,
1500
1028
AvahiProtocol proto,
1508
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1509
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1510
1038
flags,
1511
void *mc){
1039
void* mc){
1512
1040
if(r == NULL){
1513
1041
return;
1514
1042
}
1517
1045
timed out */
1518
1046
1519
1047
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1521
1048
return;
1522
1049
}
1523
1050
1568
1095
const char *domain,
1569
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1570
1097
flags,
1571
void *mc){
1098
void* mc){
1572
1099
if(b == NULL){
1573
1100
return;
1574
1101
}
1634
1161
errno = old_errno;
1635
1162
}
1636
1163
1637
__attribute__((nonnull, warn_unused_result))
1638
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1165
int ret;
1640
int old_errno;
1166
error_t ret_errno;
1641
1167
1642
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1169
if(s < 0){
1644
old_errno = errno;
1170
ret_errno = errno;
1645
1171
perror_plus("socket");
1646
errno = old_errno;
1172
errno = ret_errno;
1647
1173
return false;
1648
1174
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1175
strcpy(ifr->ifr_name, ifname);
1651
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1177
if(ret == -1){
1653
1178
if(debug){
1654
old_errno = errno;
1179
ret_errno = errno;
1655
1180
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1181
errno = ret_errno;
1657
1182
}
1658
1183
return false;
1659
1184
}
1660
1185
return true;
1661
1186
}
1662
1187
1663
__attribute__((nonnull, warn_unused_result))
1664
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1665
1189
1666
1190
/* Reject the loopback device */
1708
1232
* corresponds to an acceptable network device.
1709
1233
* (This function is passed to scandir(3) as a filter function.)
1710
1234
*/
1711
__attribute__((nonnull, warn_unused_result))
1712
1235
int good_interface(const struct dirent *if_entry){
1713
1236
if(if_entry->d_name[0] == '.'){
1714
1237
return 0;
1732
1255
/*
1733
1256
* This function determines if a network interface is up.
1734
1257
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
1258
bool interface_is_up(const char *interface){
1737
1259
struct ifreq ifr;
1738
1260
if(not get_flags(interface, &ifr)){
1749
1271
/*
1750
1272
* This function determines if a network interface is running
1751
1273
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
1274
bool interface_is_running(const char *interface){
1754
1275
struct ifreq ifr;
1755
1276
if(not get_flags(interface, &ifr)){
1763
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
1285
}
1765
1286
1766
__attribute__((nonnull, pure, warn_unused_result))
1767
1287
int notdotentries(const struct dirent *direntry){
1768
1288
/* Skip "." and ".." */
1769
1289
if(direntry->d_name[0] == '.'
1776
1296
}
1777
1297
1778
1298
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1780
1299
int runnable_hook(const struct dirent *direntry){
1781
1300
int ret;
1782
1301
size_t sret;
1790
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
1310
"abcdefghijklmnopqrstuvwxyz"
1792
1311
"0123456789"
1793
"_.-");
1312
"_-");
1794
1313
if((direntry->d_name)[sret] != '\0'){
1795
1314
/* Contains non-allowed characters */
1796
1315
if(debug){
1800
1319
return 0;
1801
1320
}
1802
1321
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
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);
1804
1330
if(ret == -1){
1805
1331
if(debug){
1806
1332
perror_plus("Could not stat hook");
1830
1356
return 1;
1831
1357
}
1832
1358
1833
__attribute__((nonnull, warn_unused_result))
1834
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
1360
mandos_context *mc){
1836
1361
int ret;
1840
1365
1841
1366
while(true){
1842
1367
if(mc->current_server == NULL){
1843
if(debug){
1368
if (debug){
1844
1369
fprintf_plus(stderr, "Wait until first server is found."
1845
1370
" No timeout!\n");
1846
1371
}
1847
1372
ret = avahi_simple_poll_iterate(s, -1);
1848
1373
} else {
1849
if(debug){
1374
if (debug){
1850
1375
fprintf_plus(stderr, "Check current_server if we should run"
1851
1376
" it, or wait\n");
1852
1377
}
1869
1394
- ((intmax_t)waited_time.tv_sec * 1000))
1870
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1871
1396
1872
if(debug){
1397
if (debug){
1873
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
1399
block_time);
1875
1400
}
1897
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1898
1423
}
1899
1424
if(ret != 0){
1900
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
1901
1426
return (ret != 1) ? ret : 0;
1902
1427
}
1903
1428
}
1904
1429
}
1905
1430
}
1906
1431
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
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,
1909
1485
const float delay){
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1928
1491
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
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");
1944
1499
}
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){
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){
1991
1507
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
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
}
1996
1566
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
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
}
2065
1578
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
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;
2085
1615
}
2086
1616
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;
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;
2092
1623
struct ifreq network;
2093
1624
unsigned int if_index = if_nametoindex(interface);
2094
1625
if(if_index == 0){
2103
1634
}
2104
1635
2105
1636
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
2109
1638
ret_errno = errno;
2110
1639
fprintf_plus(stderr, "Failed to get flags for interface "
2111
1640
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
1641
return ret_errno;
2114
1642
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
2116
1644
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2119
1647
ret_errno = errno;
2120
1648
perror_plus("socket");
2121
1649
errno = old_errno;
2122
1650
return ret_errno;
2123
1651
}
2124
1652
2125
1653
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
1654
close(sd);
2130
1655
errno = old_errno;
2131
1656
return EINTR;
2132
1657
}
2136
1661
interface);
2137
1662
}
2138
1663
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
}
1664
/* Raise priviliges */
1665
raise_privileges();
2145
1666
2146
1667
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
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");
2158
1675
}
2159
1676
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2162
1679
#ifdef __linux__
2163
1680
if(restore_loglevel){
2164
1681
ret_linux = klogctl(7, NULL, 0);
2168
1685
}
2169
1686
#endif /* __linux__ */
2170
1687
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
}
1688
/* Lower privileges */
1689
lower_privileges();
2180
1690
2181
1691
/* Close the socket */
2182
ret = close(sd);
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1693
if(ret == -1){
2184
1694
perror_plus("close");
2185
1695
}
2186
1696
2187
1697
if(ret_setflags == -1){
2188
errno = ioctl_errno;
1698
errno = ret_errno;
2189
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
1700
errno = old_errno;
2191
return ioctl_errno;
1701
return ret_errno;
2192
1702
}
2193
1703
} else if(debug){
2194
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2197
1707
2198
1708
/* Sleep checking until interface is running.
2199
1709
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
1710
for(int i=0; i < delay * 4; i++){
2201
1711
if(interface_is_running(interface)){
2202
1712
break;
2203
1713
}
2212
1722
return 0;
2213
1723
}
2214
1724
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
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;
2218
1730
struct ifreq network;
2219
1731
unsigned int if_index = if_nametoindex(interface);
2220
1732
if(if_index == 0){
2223
1735
return ENXIO;
2224
1736
}
2225
1737
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2228
1738
if(not get_flags(interface, &network) and debug){
2229
1739
ret_errno = errno;
2230
1740
fprintf_plus(stderr, "Failed to get flags for interface "
2231
1741
"\"%s\"\n", interface);
2232
errno = old_errno;
2233
1742
return ret_errno;
2234
1743
}
2235
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
1745
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2239
1748
ret_errno = errno;
2240
1749
perror_plus("socket");
2241
1750
errno = old_errno;
2247
1756
interface);
2248
1757
}
2249
1758
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
}
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();
2269
1767
2270
1768
/* Close the socket */
2271
int ret = close(sd);
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2272
1770
if(ret == -1){
2273
1771
perror_plus("close");
2274
1772
}
2275
1773
2276
1774
if(ret_setflags == -1){
2277
errno = ioctl_errno;
1775
errno = ret_errno;
2278
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
1777
errno = old_errno;
2280
return ioctl_errno;
1778
return ret_errno;
2281
1779
}
2282
1780
} else if(debug){
2283
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2289
1787
}
2290
1788
2291
1789
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
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 };
2297
1794
AvahiSServiceBrowser *sb = NULL;
2298
1795
error_t ret_errno;
2299
1796
int ret;
2302
1799
int exitcode = EXIT_SUCCESS;
2303
1800
char *interfaces_to_take_down = NULL;
2304
1801
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2308
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2309
1805
const char *seckey = PATHDIR "/" SECKEY;
2310
1806
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
2313
1809
2314
1810
bool gnutls_initialized = false;
2315
1811
bool gpgme_initialized = false;
2367
1863
.doc = "Bit length of the prime number used in the"
2368
1864
" Diffie-Hellman key exchange",
2369
1865
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
2375
1866
{ .name = "priority", .key = 130,
2376
1867
.arg = "STRING",
2377
1868
.doc = "GnuTLS priority string for the TLS handshake",
2432
1923
}
2433
1924
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2434
1925
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2438
1926
case 130: /* --priority */
2439
1927
mc.priority = arg;
2440
1928
break;
2480
1968
.args_doc = "",
2481
1969
.doc = "Mandos client -- Get and decrypt"
2482
1970
" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2486
1974
case 0:
2487
1975
break;
2488
1976
case ENOMEM:
2489
1977
default:
2490
errno = ret_errno;
1978
errno = ret;
2491
1979
perror_plus("argp_parse");
2492
1980
exitcode = EX_OSERR;
2493
1981
goto end;
2496
1984
goto end;
2497
1985
}
2498
1986
}
2499
1987
2500
1988
{
2501
1989
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
1990
<http://bugs.debian.org/633582> */
2503
1991
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
2509
} else {
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2510
1994
struct stat st;
2511
1995
2512
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2526
2010
}
2527
2011
}
2528
2012
}
2529
close(seckey_fd);
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2530
2014
}
2531
2015
}
2532
2016
2533
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2535
2019
if(pubkey_fd == -1){
2547
2031
}
2548
2032
}
2549
2033
}
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
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2576
2038
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
2581
}
2039
lower_privileges();
2582
2040
}
2583
2041
}
2584
2042
2608
2066
goto end;
2609
2067
}
2610
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
}
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
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
}
2615
2077
}
2616
2078
2617
2079
if(not debug){
2695
2157
2696
2158
/* If no interfaces were specified, make a list */
2697
2159
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2160
struct dirent **direntries;
2699
2161
/* Look for any good interfaces */
2700
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2701
2163
alphasort);
2705
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
2168
direntries[i]->d_name);
2707
2169
if(ret_errno != 0){
2708
errno = ret_errno;
2709
2170
perror_plus("argz_add");
2710
free(direntries[i]);
2711
2171
continue;
2712
2172
}
2713
2173
if(debug){
2714
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
2175
direntries[i]->d_name);
2716
2176
}
2717
free(direntries[i]);
2718
2177
}
2719
2178
free(direntries);
2720
2179
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2180
free(direntries);
2724
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2725
2182
exitcode = EXIT_FAILURE;
2726
2183
goto end;
2749
2206
break;
2750
2207
}
2751
2208
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2753
2210
if(not interface_was_up){
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2757
2214
} else {
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2764
2218
}
2765
2219
}
2766
2220
}
2782
2236
goto end;
2783
2237
}
2784
2238
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2786
2240
if(ret == -1){
2787
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2788
2242
exitcode = EX_UNAVAILABLE;
2795
2249
goto end;
2796
2250
}
2797
2251
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){
2252
if(mkdtemp(tempdir) == NULL){
2808
2253
perror_plus("mkdtemp");
2809
2254
goto end;
2810
2255
}
2256
tempdir_created = true;
2811
2257
2812
2258
if(quit_now){
2813
2259
goto end;
2888
2334
sleep((unsigned int)retry_interval);
2889
2335
}
2890
2336
2891
if(not quit_now){
2337
if (not quit_now){
2892
2338
exitcode = EXIT_SUCCESS;
2893
2339
}
2894
2340
2910
2356
2911
2357
/* Allocate a new server */
2912
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2359
&config, NULL, NULL, &ret_errno);
2914
2360
2915
2361
/* Free the Avahi configuration data */
2916
2362
avahi_server_config_free(&config);
2919
2365
/* Check if creating the Avahi server object succeeded */
2920
2366
if(mc.server == NULL){
2921
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2368
avahi_strerror(ret_errno));
2923
2369
exitcode = EX_UNAVAILABLE;
2924
2370
goto end;
2925
2371
}
2949
2395
if(debug){
2950
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2951
2397
}
2952
2398
2953
2399
ret = avahi_loop_with_timeout(simple_poll,
2954
2400
(int)(retry_interval * 1000), &mc);
2955
2401
if(debug){
2960
2406
end:
2961
2407
2962
2408
if(debug){
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
2410
}
2971
2411
2972
2412
/* Cleanup things */
2983
2423
2984
2424
if(gnutls_initialized){
2985
2425
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
2986
2427
gnutls_dh_params_deinit(mc.dh_params);
2987
2428
}
2988
2429
2996
2437
mc.current_server->prev->next = NULL;
2997
2438
while(mc.current_server != NULL){
2998
2439
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
3007
2440
free(mc.current_server);
3008
2441
mc.current_server = next;
3009
2442
}
3010
2443
}
3011
2444
3012
/* Re-raise privileges */
2445
/* Re-raise priviliges */
3013
2446
{
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
}
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();
3048
2472
}
3049
2473
3050
2474
free(interfaces_to_take_down);
3051
2475
free(interfaces_hooks);
3052
2476
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
2477
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
3055
2479
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){
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
3068
2484
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
3109
/* Removes the GPGME temp directory and all files inside */
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
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
}
3112
2511
}
3113
2512
3114
2513
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0