To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 671
- compare with another revision
- download diff
- download tarball
- view history from revision 671
- Committer: Teddy Hogeborn
- Date: 2014-03-10 10:11:37 UTC
- Revision ID: teddy@recompile.se-20140310101137-3khoc3qrntp13l08
White space fix: change "if (" to "if(" in C code.
* plugins.d/mandos-client.c (start_mandos_communication): White space
fix.
(avahi_loop_with_timeout, main): - '' -
* plugins.d/mandos-client.c (start_mandos_communication): White space
fix.
(avahi_loop_with_timeout, main): - '' -
- files added:
- debian/upstream-signing-key.pgp
- files removed:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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(),
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect(),
59
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
#include <fcntl.h> /* open() */
61
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
62
*/
63
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
76
setgid(), pause(), _exit() */
78
77
#include <arpa/inet.h> /* inet_pton(), htons() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
142
141
static const char sys_class_net[] = "/sys/class/net";
143
142
char *connect_to = NULL;
144
143
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
144
uid_t uid = 65534;
147
145
gid_t gid = 65534;
148
146
185
183
perror(print_text);
186
184
}
187
185
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
__attribute__((format (gnu_printf, 2, 3)))
189
187
int fprintf_plus(FILE *stream, const char *format, ...){
190
188
va_list ap;
191
189
va_start (ap, format);
200
198
* bytes. "buffer_capacity" is how much is currently allocated,
201
199
* "buffer_length" is how much is already used.
202
200
*/
203
__attribute__((nonnull, warn_unused_result))
204
201
size_t incbuffer(char **buffer, size_t buffer_length,
205
202
size_t buffer_capacity){
206
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
219
216
}
220
217
221
218
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
220
int af, server **current_server){
225
221
int ret;
234
230
.af = af };
235
231
if(new_server->ip == NULL){
236
232
perror_plus("strdup");
237
free(new_server);
238
233
return false;
239
234
}
240
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
236
if(ret == -1){
242
237
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
238
return false;
253
239
}
254
240
/* Special case of first server */
256
242
new_server->next = new_server;
257
243
new_server->prev = new_server;
258
244
*current_server = new_server;
245
/* Place the new server last in the list */
259
246
} else {
260
/* Place the new server last in the list */
261
247
new_server->next = *current_server;
262
248
new_server->prev = (*current_server)->prev;
263
249
new_server->prev->next = new_server;
269
255
/*
270
256
* Initialize GPGME.
271
257
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
277
260
gpgme_error_t rc;
278
261
gpgme_engine_info_t engine_info;
279
262
280
263
/*
281
264
* Helper function to insert pub and seckey to the engine keyring.
282
265
*/
283
bool import_key(const char * const filename){
266
bool import_key(const char *filename){
284
267
int ret;
285
268
int fd;
286
269
gpgme_data_t pgp_data;
367
350
* Decrypt OpenPGP data.
368
351
* Returns -1 on error
369
352
*/
370
__attribute__((nonnull, warn_unused_result))
371
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
354
size_t crypto_size,
373
355
char **plaintext,
493
475
return plaintext_length;
494
476
}
495
477
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
478
static const char * safer_gnutls_strerror(int value){
505
479
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
507
483
}
508
484
509
485
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
486
static void debuggnutls(__attribute__((unused)) int level,
512
487
const char* string){
513
488
fprintf_plus(stderr, "GnuTLS: %s", string);
514
489
}
515
490
516
__attribute__((nonnull, warn_unused_result))
517
491
static int init_gnutls_global(const char *pubkeyfilename,
518
492
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
493
mandos_context *mc){
521
494
int ret;
522
unsigned int uret;
523
495
524
496
if(debug){
525
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
576
548
safer_gnutls_strerror(ret));
577
549
goto globalfail;
578
550
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
555
goto globalfail;
556
}
557
751
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
559
753
560
return 0;
760
567
return -1;
761
568
}
762
569
763
__attribute__((nonnull, warn_unused_result))
764
570
static int init_gnutls_session(gnutls_session_t *session,
765
571
mandos_context *mc){
766
572
int ret;
813
619
/* ignore client certificate if any. */
814
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
621
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
816
624
return 0;
817
625
}
818
626
820
628
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
629
__attribute__((unused)) const char *txt){}
822
630
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
631
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
632
static int start_mandos_communication(const char *ip, in_port_t port,
1043
633
AvahiIfIndex if_index,
1044
634
int af, mandos_context *mc){
1053
643
int retval = -1;
1054
644
gnutls_session_t session;
1055
645
int pf; /* Protocol family */
1056
bool route_added = false;
1057
646
1058
647
errno = 0;
1059
648
1117
706
PRIuMAX "\n", ip, (uintmax_t)port);
1118
707
}
1119
708
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
710
if(tcp_sd < 0){
1122
711
int e = errno;
1123
712
perror_plus("socket");
1151
740
goto mandos_end;
1152
741
}
1153
742
if(af == AF_INET6){
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
744
if(IN6_IS_ADDR_LINKLOCAL
1156
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1157
746
if(if_index == AVAHI_IF_UNSPEC){
1212
801
goto mandos_end;
1213
802
}
1214
803
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
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
http://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;
804
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
807
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
810
}
811
if(ret < 0){
812
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
int e = errno;
814
perror_plus("connect");
815
errno = e;
816
}
817
goto mandos_end;
818
}
819
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
1270
823
}
1271
824
1272
825
const char *out = mandos_protocol_version;
1455
1008
1456
1009
mandos_end:
1457
1010
{
1458
if(route_added){
1459
if(not delete_local_route(ip, if_index)){
1460
fprintf_plus(stderr, "Failed to delete local route to %s on"
1461
" interface %d", ip, if_index);
1462
}
1463
}
1464
1011
int e = errno;
1465
1012
free(decrypted_buffer);
1466
1013
free(buffer);
1483
1030
return retval;
1484
1031
}
1485
1032
1486
__attribute__((nonnull))
1487
1033
static void resolve_callback(AvahiSServiceResolver *r,
1488
1034
AvahiIfIndex interface,
1489
1035
AvahiProtocol proto,
1497
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
1498
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1499
1045
flags,
1500
void *mc){
1046
void* mc){
1501
1047
if(r == NULL){
1502
1048
return;
1503
1049
}
1506
1052
timed out */
1507
1053
1508
1054
if(quit_now){
1509
avahi_s_service_resolver_free(r);
1510
1055
return;
1511
1056
}
1512
1057
1557
1102
const char *domain,
1558
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1559
1104
flags,
1560
void *mc){
1105
void* mc){
1561
1106
if(b == NULL){
1562
1107
return;
1563
1108
}
1623
1168
errno = old_errno;
1624
1169
}
1625
1170
1626
__attribute__((nonnull, warn_unused_result))
1627
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1628
1172
int ret;
1629
1173
error_t ret_errno;
1648
1192
return true;
1649
1193
}
1650
1194
1651
__attribute__((nonnull, warn_unused_result))
1652
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1653
1196
1654
1197
/* Reject the loopback device */
1696
1239
* corresponds to an acceptable network device.
1697
1240
* (This function is passed to scandir(3) as a filter function.)
1698
1241
*/
1699
__attribute__((nonnull, warn_unused_result))
1700
1242
int good_interface(const struct dirent *if_entry){
1701
1243
if(if_entry->d_name[0] == '.'){
1702
1244
return 0;
1720
1262
/*
1721
1263
* This function determines if a network interface is up.
1722
1264
*/
1723
__attribute__((nonnull, warn_unused_result))
1724
1265
bool interface_is_up(const char *interface){
1725
1266
struct ifreq ifr;
1726
1267
if(not get_flags(interface, &ifr)){
1737
1278
/*
1738
1279
* This function determines if a network interface is running
1739
1280
*/
1740
__attribute__((nonnull, warn_unused_result))
1741
1281
bool interface_is_running(const char *interface){
1742
1282
struct ifreq ifr;
1743
1283
if(not get_flags(interface, &ifr)){
1751
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1752
1292
}
1753
1293
1754
__attribute__((nonnull, pure, warn_unused_result))
1755
1294
int notdotentries(const struct dirent *direntry){
1756
1295
/* Skip "." and ".." */
1757
1296
if(direntry->d_name[0] == '.'
1764
1303
}
1765
1304
1766
1305
/* Is this directory entry a runnable program? */
1767
__attribute__((nonnull, warn_unused_result))
1768
1306
int runnable_hook(const struct dirent *direntry){
1769
1307
int ret;
1770
1308
size_t sret;
1778
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1779
1317
"abcdefghijklmnopqrstuvwxyz"
1780
1318
"0123456789"
1781
"_.-");
1319
"_-");
1782
1320
if((direntry->d_name)[sret] != '\0'){
1783
1321
/* Contains non-allowed characters */
1784
1322
if(debug){
1788
1326
return 0;
1789
1327
}
1790
1328
1791
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1792
1337
if(ret == -1){
1793
1338
if(debug){
1794
1339
perror_plus("Could not stat hook");
1818
1363
return 1;
1819
1364
}
1820
1365
1821
__attribute__((nonnull, warn_unused_result))
1822
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1823
1367
mandos_context *mc){
1824
1368
int ret;
1892
1436
}
1893
1437
}
1894
1438
1895
__attribute__((nonnull))
1896
void run_network_hooks(const char *mode, const char *interface,
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
1897
1492
const float delay){
1898
struct dirent **direntries = NULL;
1899
if(hookdir_fd == -1){
1900
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1901
| O_CLOEXEC);
1902
if(hookdir_fd == -1){
1903
if(errno == ENOENT){
1904
if(debug){
1905
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1906
" found\n", hookdir);
1907
}
1908
} else {
1909
perror_plus("open");
1910
}
1911
return;
1912
}
1913
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1926
1496
if(numhooks == -1){
1927
perror_plus("scandir");
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1942
1504
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
1989
1514
perror_plus("asprintf");
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1994
1573
free(delaystring);
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
2063
1585
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
2083
1622
}
2084
1623
2085
__attribute__((nonnull, warn_unused_result))
2086
1624
error_t bring_up_interface(const char *const interface,
2087
1625
const float delay){
1626
int sd = -1;
2088
1627
error_t old_errno = errno;
2089
int ret;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
2090
1630
struct ifreq network;
2091
1631
unsigned int if_index = if_nametoindex(interface);
2092
1632
if(if_index == 0){
2101
1641
}
2102
1642
2103
1643
if(not interface_is_up(interface)){
2104
error_t ret_errno = 0, ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
1644
if(not get_flags(interface, &network) and debug){
2106
1645
ret_errno = errno;
2107
1646
fprintf_plus(stderr, "Failed to get flags for interface "
2108
1647
"\"%s\"\n", interface);
2109
errno = old_errno;
2110
1648
return ret_errno;
2111
1649
}
2112
network.ifr_flags |= IFF_UP; /* set flag */
1650
network.ifr_flags |= IFF_UP;
2113
1651
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
2116
1654
ret_errno = errno;
2117
1655
perror_plus("socket");
2118
1656
errno = old_errno;
2119
1657
return ret_errno;
2120
1658
}
2121
1659
2122
1660
if(quit_now){
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
1661
close(sd);
2127
1662
errno = old_errno;
2128
1663
return EINTR;
2129
1664
}
2133
1668
interface);
2134
1669
}
2135
1670
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
1671
/* Raise priviliges */
1672
raise_privileges();
2142
1673
2143
1674
#ifdef __linux__
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
2155
1682
}
2156
1683
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
2159
1686
#ifdef __linux__
2160
1687
if(restore_loglevel){
2161
1688
ret_linux = klogctl(7, NULL, 0);
2165
1692
}
2166
1693
#endif /* __linux__ */
2167
1694
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
1695
/* Lower privileges */
1696
lower_privileges();
2177
1697
2178
1698
/* Close the socket */
2179
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
1702
}
2183
1703
2184
1704
if(ret_setflags == -1){
2185
errno = ioctl_errno;
1705
errno = ret_errno;
2186
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2187
1707
errno = old_errno;
2188
return ioctl_errno;
1708
return ret_errno;
2189
1709
}
2190
1710
} else if(debug){
2191
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2209
1729
return 0;
2210
1730
}
2211
1731
2212
__attribute__((nonnull, warn_unused_result))
2213
1732
error_t take_down_interface(const char *const interface){
2214
1733
error_t old_errno = errno;
2215
1734
struct ifreq network;
2220
1739
return ENXIO;
2221
1740
}
2222
1741
if(interface_is_up(interface)){
2223
error_t ret_errno = 0, ioctl_errno = 0;
1742
error_t ret_errno = 0;
2224
1743
if(not get_flags(interface, &network) and debug){
2225
1744
ret_errno = errno;
2226
1745
fprintf_plus(stderr, "Failed to get flags for interface "
2227
1746
"\"%s\"\n", interface);
2228
errno = old_errno;
2229
1747
return ret_errno;
2230
1748
}
2231
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2232
1750
2233
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2234
if(sd == -1){
1752
if(sd < 0){
2235
1753
ret_errno = errno;
2236
1754
perror_plus("socket");
2237
1755
errno = old_errno;
2243
1761
interface);
2244
1762
}
2245
1763
2246
/* Raise privileges */
2247
ret_errno = raise_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to raise privileges");
2251
}
1764
/* Raise priviliges */
1765
raise_privileges();
2252
1766
2253
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2254
ioctl_errno = errno;
1768
ret_errno = errno;
2255
1769
2256
/* If raise_privileges() succeeded above */
2257
if(ret_errno == 0){
2258
/* Lower privileges */
2259
ret_errno = lower_privileges();
2260
if(ret_errno != 0){
2261
errno = ret_errno;
2262
perror_plus("Failed to lower privileges");
2263
}
2264
}
1770
/* Lower privileges */
1771
lower_privileges();
2265
1772
2266
1773
/* Close the socket */
2267
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
1777
}
2271
1778
2272
1779
if(ret_setflags == -1){
2273
errno = ioctl_errno;
1780
errno = ret_errno;
2274
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
1782
errno = old_errno;
2276
return ioctl_errno;
1783
return ret_errno;
2277
1784
}
2278
1785
} else if(debug){
2279
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2285
1792
}
2286
1793
2287
1794
int main(int argc, char *argv[]){
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2289
1796
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
1797
"+CTYPE-OPENPGP", .current_server = NULL,
2291
1798
.interfaces = NULL, .interfaces_size = 0 };
2292
1799
AvahiSServiceBrowser *sb = NULL;
2293
1800
error_t ret_errno;
2297
1804
int exitcode = EXIT_SUCCESS;
2298
1805
char *interfaces_to_take_down = NULL;
2299
1806
size_t interfaces_to_take_down_size = 0;
2300
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2301
char old_tempdir[] = "/tmp/mandosXXXXXX";
2302
char *tempdir = NULL;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
2303
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2304
1810
const char *seckey = PATHDIR "/" SECKEY;
2305
1811
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
2307
1812
char *interfaces_hooks = NULL;
2308
1813
2309
1814
bool gnutls_initialized = false;
2362
1867
.doc = "Bit length of the prime number used in the"
2363
1868
" Diffie-Hellman key exchange",
2364
1869
.group = 2 },
2365
{ .name = "dh-params", .key = 134,
2366
.arg = "FILE",
2367
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2368
" for the Diffie-Hellman key exchange",
2369
.group = 2 },
2370
1870
{ .name = "priority", .key = 130,
2371
1871
.arg = "STRING",
2372
1872
.doc = "GnuTLS priority string for the TLS handshake",
2427
1927
}
2428
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2429
1929
break;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2432
break;
2433
1930
case 130: /* --priority */
2434
1931
mc.priority = arg;
2435
1932
break;
2491
1988
goto end;
2492
1989
}
2493
1990
}
2494
1991
2495
1992
{
2496
1993
/* Work around Debian bug #633582:
2497
1994
<http://bugs.debian.org/633582> */
2498
1995
2499
/* Re-raise privileges */
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("Failed to raise privileges");
2504
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2505
1998
struct stat st;
2506
1999
2507
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2524
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2525
2018
}
2526
2019
}
2527
2020
2528
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2529
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2530
2023
if(pubkey_fd == -1){
2545
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2546
2039
}
2547
2040
}
2548
2549
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2550
int dhparams_fd = open(dh_params_file, O_RDONLY);
2551
if(dhparams_fd == -1){
2552
perror_plus("open");
2553
} else {
2554
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2555
if(ret == -1){
2556
perror_plus("fstat");
2557
} else {
2558
if(S_ISREG(st.st_mode)
2559
and st.st_uid == 0 and st.st_gid == 0){
2560
ret = fchown(dhparams_fd, uid, gid);
2561
if(ret == -1){
2562
perror_plus("fchown");
2563
}
2564
}
2565
}
2566
TEMP_FAILURE_RETRY(close(dhparams_fd));
2567
}
2568
}
2569
2041
2570
2042
/* Lower privileges */
2571
ret_errno = lower_privileges();
2572
if(ret_errno != 0){
2573
errno = ret_errno;
2574
perror_plus("Failed to lower privileges");
2575
}
2043
lower_privileges();
2576
2044
}
2577
2045
}
2578
2046
2604
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2605
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2606
2074
}
2607
run_network_hooks("start", interfaces_hooks != NULL ?
2608
interfaces_hooks : "", delay);
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2609
2079
}
2610
2080
2611
2081
if(not debug){
2689
2159
2690
2160
/* If no interfaces were specified, make a list */
2691
2161
if(mc.interfaces == NULL){
2692
struct dirent **direntries = NULL;
2162
struct dirent **direntries;
2693
2163
/* Look for any good interfaces */
2694
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2695
2165
alphasort);
2701
2171
if(ret_errno != 0){
2702
2172
errno = ret_errno;
2703
2173
perror_plus("argz_add");
2704
free(direntries[i]);
2705
2174
continue;
2706
2175
}
2707
2176
if(debug){
2708
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2709
2178
direntries[i]->d_name);
2710
2179
}
2711
free(direntries[i]);
2712
2180
}
2713
2181
free(direntries);
2714
2182
} else {
2715
if(ret == 0){
2716
free(direntries);
2717
}
2183
free(direntries);
2718
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2719
2185
exitcode = EXIT_FAILURE;
2720
2186
goto end;
2743
2209
break;
2744
2210
}
2745
2211
bool interface_was_up = interface_is_up(interface);
2746
errno = bring_up_interface(interface, delay);
2212
ret = bring_up_interface(interface, delay);
2747
2213
if(not interface_was_up){
2748
if(errno != 0){
2749
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2750
" %s\n", interface, strerror(errno));
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2751
2217
} else {
2752
errno = argz_add(&interfaces_to_take_down,
2753
&interfaces_to_take_down_size,
2754
interface);
2755
if(errno != 0){
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2756
2223
perror_plus("argz_add");
2757
2224
}
2758
2225
}
2776
2243
goto end;
2777
2244
}
2778
2245
2779
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2780
2247
if(ret == -1){
2781
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2782
2249
exitcode = EX_UNAVAILABLE;
2789
2256
goto end;
2790
2257
}
2791
2258
2792
/* Try /run/tmp before /tmp */
2793
tempdir = mkdtemp(run_tempdir);
2794
if(tempdir == NULL and errno == ENOENT){
2795
if(debug){
2796
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2797
run_tempdir, old_tempdir);
2798
}
2799
tempdir = mkdtemp(old_tempdir);
2800
}
2801
if(tempdir == NULL){
2259
if(mkdtemp(tempdir) == NULL){
2802
2260
perror_plus("mkdtemp");
2803
2261
goto end;
2804
2262
}
2263
tempdir_created = true;
2805
2264
2806
2265
if(quit_now){
2807
2266
goto end;
2943
2402
if(debug){
2944
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2945
2404
}
2946
2405
2947
2406
ret = avahi_loop_with_timeout(simple_poll,
2948
2407
(int)(retry_interval * 1000), &mc);
2949
2408
if(debug){
2985
2444
mc.current_server->prev->next = NULL;
2986
2445
while(mc.current_server != NULL){
2987
2446
server *next = mc.current_server->next;
2988
#ifdef __GNUC__
2989
#pragma GCC diagnostic push
2990
#pragma GCC diagnostic ignored "-Wcast-qual"
2991
#endif
2992
free((char *)(mc.current_server->ip));
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic pop
2995
#endif
2996
2447
free(mc.current_server);
2997
2448
mc.current_server = next;
2998
2449
}
2999
2450
}
3000
2451
3001
/* Re-raise privileges */
2452
/* Re-raise priviliges */
3002
2453
{
3003
ret_errno = raise_privileges();
3004
if(ret_errno != 0){
3005
errno = ret_errno;
3006
perror_plus("Failed to raise privileges");
3007
} else {
3008
3009
/* Run network hooks */
3010
run_network_hooks("stop", interfaces_hooks != NULL ?
3011
interfaces_hooks : "", delay);
3012
3013
/* Take down the network interfaces which were brought up */
3014
{
3015
char *interface = NULL;
3016
while((interface=argz_next(interfaces_to_take_down,
3017
interfaces_to_take_down_size,
3018
interface))){
3019
ret_errno = take_down_interface(interface);
3020
if(ret_errno != 0){
3021
errno = ret_errno;
3022
perror_plus("Failed to take down interface");
3023
}
3024
}
3025
if(debug and (interfaces_to_take_down == NULL)){
3026
fprintf_plus(stderr, "No interfaces needed to be taken"
3027
" down\n");
3028
}
3029
}
3030
}
3031
3032
ret_errno = lower_privileges_permanently();
3033
if(ret_errno != 0){
3034
errno = ret_errno;
3035
perror_plus("Failed to lower privileges permanently");
3036
}
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2470
}
2471
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2475
}
2476
}
2477
2478
lower_privileges_permanently();
3037
2479
}
3038
2480
3039
2481
free(interfaces_to_take_down);
3040
2482
free(interfaces_hooks);
3041
2483
3042
2484
/* Removes the GPGME temp directory and all files inside */
3043
if(tempdir != NULL){
2485
if(tempdir_created){
3044
2486
struct dirent **direntries = NULL;
3045
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3046
| O_NOFOLLOW
3047
| O_DIRECTORY
3048
| O_PATH));
3049
if(tempdir_fd == -1){
3050
perror_plus("open");
3051
} else {
3052
#ifdef __GLIBC__
3053
#if __GLIBC_PREREQ(2, 15)
3054
int numentries = scandirat(tempdir_fd, ".", &direntries,
3055
notdotentries, alphasort);
3056
#else /* not __GLIBC_PREREQ(2, 15) */
3057
int numentries = scandir(tempdir, &direntries, notdotentries,
3058
alphasort);
3059
#endif /* not __GLIBC_PREREQ(2, 15) */
3060
#else /* not __GLIBC__ */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC__ */
3064
if(numentries >= 0){
3065
for(int i = 0; i < numentries; i++){
3066
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3067
if(ret == -1){
3068
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3069
" \"%s\", 0): %s\n", tempdir,
3070
direntries[i]->d_name, strerror(errno));
3071
}
3072
free(direntries[i]);
3073
}
3074
3075
/* need to clean even if 0 because man page doesn't specify */
3076
free(direntries);
3077
if(numentries == -1){
3078
perror_plus("scandir");
3079
}
3080
ret = rmdir(tempdir);
3081
if(ret == -1 and errno != ENOENT){
3082
perror_plus("rmdir");
3083
}
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
alphasort);
2490
if(numentries > 0){
2491
for(int i = 0; i < numentries; i++){
2492
direntry = direntries[i];
2493
char *fullname = NULL;
2494
ret = asprintf(&fullname, "%s/%s", tempdir,
2495
direntry->d_name);
2496
if(ret < 0){
2497
perror_plus("asprintf");
2498
continue;
2499
}
2500
ret = remove(fullname);
2501
if(ret == -1){
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
2504
}
2505
free(fullname);
3084
2506
}
3085
TEMP_FAILURE_RETRY(close(tempdir_fd));
2507
}
2508
2509
/* need to clean even if 0 because man page doesn't specify */
2510
free(direntries);
2511
if(numentries == -1){
2512
perror_plus("scandir");
2513
}
2514
ret = rmdir(tempdir);
2515
if(ret == -1 and errno != ENOENT){
2516
perror_plus("rmdir");
3086
2517
}
3087
2518
}
3088
2519
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0