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- Committer: Teddy Hogeborn
- Date: 2013-12-31 16:02:18 UTC
- Revision ID: teddy@recompile.se-20131231160218-plmmb0o0iifkd5l2
Specify BusName in systemd service file.
* mandos.service (BusName): Uncommented.
* mandos.service (BusName): Uncommented.
- 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(),
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
93
91
argz_delete(), argz_append(),
94
92
argz_stringify(), argz_add(),
95
93
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
94
99
95
#ifdef __linux__
100
96
#include <sys/klog.h> /* klogctl() */
142
138
static const char sys_class_net[] = "/sys/class/net";
143
139
char *connect_to = NULL;
144
140
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
141
uid_t uid = 65534;
147
142
gid_t gid = 65534;
148
143
185
180
perror(print_text);
186
181
}
187
182
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
189
184
int fprintf_plus(FILE *stream, const char *format, ...){
190
185
va_list ap;
191
186
va_start (ap, format);
200
195
* bytes. "buffer_capacity" is how much is currently allocated,
201
196
* "buffer_length" is how much is already used.
202
197
*/
203
__attribute__((nonnull, warn_unused_result))
204
198
size_t incbuffer(char **buffer, size_t buffer_length,
205
199
size_t buffer_capacity){
206
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
213
203
return 0;
214
204
}
215
*buffer = new_buf;
216
205
buffer_capacity += BUFFER_SIZE;
217
206
}
218
207
return buffer_capacity;
219
208
}
220
209
221
210
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
212
int af, server **current_server){
225
213
int ret;
234
222
.af = af };
235
223
if(new_server->ip == NULL){
236
224
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
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
225
return false;
253
226
}
254
227
/* Special case of first server */
256
229
new_server->next = new_server;
257
230
new_server->prev = new_server;
258
231
*current_server = new_server;
232
/* Place the new server last in the list */
259
233
} else {
260
/* Place the new server last in the list */
261
234
new_server->next = *current_server;
262
235
new_server->prev = (*current_server)->prev;
263
236
new_server->prev->next = new_server;
264
237
(*current_server)->prev = new_server;
265
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
266
244
return true;
267
245
}
268
246
269
247
/*
270
248
* Initialize GPGME.
271
249
*/
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){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
277
252
gpgme_error_t rc;
278
253
gpgme_engine_info_t engine_info;
279
254
280
255
/*
281
256
* Helper function to insert pub and seckey to the engine keyring.
282
257
*/
283
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
284
259
int ret;
285
260
int fd;
286
261
gpgme_data_t pgp_data;
367
342
* Decrypt OpenPGP data.
368
343
* Returns -1 on error
369
344
*/
370
__attribute__((nonnull, warn_unused_result))
371
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
346
size_t crypto_size,
373
347
char **plaintext,
493
467
return plaintext_length;
494
468
}
495
469
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
498
471
const char *ret = gnutls_strerror(value);
499
472
if(ret == NULL)
500
473
ret = "(unknown)";
502
475
}
503
476
504
477
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
478
static void debuggnutls(__attribute__((unused)) int level,
507
479
const char* string){
508
480
fprintf_plus(stderr, "GnuTLS: %s", string);
509
481
}
510
482
511
__attribute__((nonnull, warn_unused_result))
512
483
static int init_gnutls_global(const char *pubkeyfilename,
513
484
const char *seckeyfilename,
514
485
mandos_context *mc){
588
559
return -1;
589
560
}
590
561
591
__attribute__((nonnull, warn_unused_result))
592
562
static int init_gnutls_session(gnutls_session_t *session,
593
563
mandos_context *mc){
594
564
int ret;
650
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
651
621
__attribute__((unused)) const char *txt){}
652
622
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char remove_arg[] = "remove";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
716
if(debug){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
719
}
720
return false;
721
}
722
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
726
return false;
727
}
728
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
730
if(devnull == -1){
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
732
return false;
733
}
734
pid_t pid = fork();
735
if(pid == 0){
736
/* Child */
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
739
if(errno != 0){
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
742
} else {
743
/* Set group */
744
errno = 0;
745
ret = setgid(0);
746
if(ret == -1){
747
perror_plus("setgid");
748
_exit(EX_NOPERM);
749
}
750
/* Reset supplementary groups */
751
errno = 0;
752
ret = setgroups(0, NULL);
753
if(ret == -1){
754
perror_plus("setgroups");
755
_exit(EX_NOPERM);
756
}
757
}
758
ret = dup2(devnull, STDIN_FILENO);
759
if(ret == -1){
760
perror_plus("dup2(devnull, STDIN_FILENO)");
761
_exit(EX_OSERR);
762
}
763
ret = close(devnull);
764
if(ret == -1){
765
perror_plus("close");
766
_exit(EX_OSERR);
767
}
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
769
if(ret == -1){
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
771
_exit(EX_OSERR);
772
}
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
774
O_RDONLY
775
| O_DIRECTORY
776
| O_PATH
777
| O_CLOEXEC));
778
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
779
helper, O_RDONLY));
780
TEMP_FAILURE_RETRY(close(helperdir_fd));
781
#ifdef __GNUC__
782
#pragma GCC diagnostic push
783
#pragma GCC diagnostic ignored "-Wcast-qual"
784
#endif
785
if(fexecve(helper_fd, (char *const [])
786
{ helper, add ? add_arg : remove_arg, (char *)address,
787
interface, NULL }, environ) == -1){
788
#ifdef __GNUC__
789
#pragma GCC diagnostic pop
790
#endif
791
perror_plus("fexecve");
792
_exit(EXIT_FAILURE);
793
}
794
}
795
if(pid == -1){
796
perror_plus("fork");
797
return false;
798
}
799
int status;
800
pid_t pret = -1;
801
errno = 0;
802
do {
803
pret = waitpid(pid, &status, 0);
804
if(pret == -1 and errno == EINTR and quit_now){
805
int errno_raising = 0;
806
if((errno = raise_privileges()) != 0){
807
errno_raising = errno;
808
perror_plus("Failed to raise privileges in order to"
809
" kill helper program");
810
}
811
if(kill(pid, SIGTERM) == -1){
812
perror_plus("kill");
813
}
814
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
815
perror_plus("Failed to lower privileges after killing"
816
" helper program");
817
}
818
return false;
819
}
820
} while(pret == -1 and errno == EINTR);
821
if(pret == -1){
822
perror_plus("waitpid");
823
return false;
824
}
825
if(WIFEXITED(status)){
826
if(WEXITSTATUS(status) != 0){
827
fprintf_plus(stderr, "Error: iprouteadddel exited"
828
" with status %d\n", WEXITSTATUS(status));
829
return false;
830
}
831
return true;
832
}
833
if(WIFSIGNALED(status)){
834
fprintf_plus(stderr, "Error: iprouteadddel died by"
835
" signal %d\n", WTERMSIG(status));
836
return false;
837
}
838
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
839
return false;
840
}
841
842
__attribute__((nonnull, warn_unused_result))
843
static bool add_local_route(const char *address,
844
AvahiIfIndex if_index){
845
return add_remove_local_route(true, address, if_index);
846
}
847
848
__attribute__((nonnull, warn_unused_result))
849
static bool remove_local_route(const char *address,
850
AvahiIfIndex if_index){
851
return add_remove_local_route(false, address, if_index);
852
}
853
854
623
/* Called when a Mandos server is found */
855
__attribute__((nonnull, warn_unused_result))
856
624
static int start_mandos_communication(const char *ip, in_port_t port,
857
625
AvahiIfIndex if_index,
858
626
int af, mandos_context *mc){
859
627
int ret, tcp_sd = -1;
860
628
ssize_t sret;
861
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
862
633
char *buffer = NULL;
863
634
char *decrypted_buffer = NULL;
864
635
size_t buffer_length = 0;
867
638
int retval = -1;
868
639
gnutls_session_t session;
869
640
int pf; /* Protocol family */
870
bool route_added = false;
871
641
872
642
errno = 0;
873
643
931
701
PRIuMAX "\n", ip, (uintmax_t)port);
932
702
}
933
703
934
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
935
705
if(tcp_sd < 0){
936
706
int e = errno;
937
707
perror_plus("socket");
946
716
947
717
memset(&to, 0, sizeof(to));
948
718
if(af == AF_INET6){
949
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
950
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
951
721
} else { /* IPv4 */
952
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
953
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
954
724
}
955
725
if(ret < 0 ){
956
726
int e = errno;
965
735
goto mandos_end;
966
736
}
967
737
if(af == AF_INET6){
968
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
969
if(IN6_IS_ADDR_LINKLOCAL
970
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
971
748
if(if_index == AVAHI_IF_UNSPEC){
972
749
fprintf_plus(stderr, "An IPv6 link-local address is"
973
750
" incomplete without a network interface\n");
975
752
goto mandos_end;
976
753
}
977
754
/* Set the network interface number as scope */
978
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
755
to.in6.sin6_scope_id = (uint32_t)if_index;
979
756
}
980
757
} else {
981
((struct sockaddr_in *)&to)->sin_port = htons(port);
758
to.in.sin_port = htons(port);
982
759
}
983
760
984
761
if(quit_now){
1001
778
}
1002
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1003
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1004
if(af == AF_INET6){
1005
ret = getnameinfo((struct sockaddr *)&to,
1006
sizeof(struct sockaddr_in6),
1007
addrstr, sizeof(addrstr), NULL, 0,
1008
NI_NUMERICHOST);
1009
} else {
1010
ret = getnameinfo((struct sockaddr *)&to,
1011
sizeof(struct sockaddr_in),
1012
addrstr, sizeof(addrstr), NULL, 0,
1013
NI_NUMERICHOST);
1014
}
1015
if(ret == EAI_SYSTEM){
1016
perror_plus("getnameinfo");
1017
} else if(ret != 0) {
1018
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1019
} else if(strcmp(addrstr, ip) != 0){
1020
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1021
}
1022
}
1023
1024
if(quit_now){
1025
errno = EINTR;
1026
goto mandos_end;
1027
}
1028
1029
while(true){
1030
if(af == AF_INET6){
1031
ret = connect(tcp_sd, (struct sockaddr *)&to,
1032
sizeof(struct sockaddr_in6));
1033
} else {
1034
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1035
sizeof(struct sockaddr_in));
1036
}
1037
if(ret < 0){
1038
if(errno == ENETUNREACH
1039
and if_index != AVAHI_IF_UNSPEC
1040
and connect_to == NULL
1041
and not route_added and
1042
((af == AF_INET6 and not
1043
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1044
&to)->sin6_addr)))
1045
or (af == AF_INET and
1046
/* Not a a IPv4LL address */
1047
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1048
& 0xFFFF0000L) != 0xA9FE0000L))){
1049
/* Work around Avahi bug - Avahi does not announce link-local
1050
addresses if it has a global address, so local hosts with
1051
*only* a link-local address (e.g. Mandos clients) cannot
1052
connect to a Mandos server announced by Avahi on a server
1053
host with a global address. Work around this by retrying
1054
with an explicit route added with the server's address.
1055
1056
Avahi bug reference:
1057
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1058
https://bugs.debian.org/587961
1059
*/
1060
int e = errno;
1061
route_added = add_local_route(ip, if_index);
1062
if(route_added){
1063
continue;
1064
}
1065
errno = e;
1066
}
1067
if(errno != ECONNREFUSED or debug){
1068
int e = errno;
1069
perror_plus("connect");
1070
errno = e;
1071
}
1072
goto mandos_end;
1073
}
1074
1075
if(quit_now){
1076
errno = EINTR;
1077
goto mandos_end;
1078
}
1079
break;
781
const char *pcret;
782
if(af == AF_INET6){
783
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
784
sizeof(addrstr));
785
} else {
786
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
787
sizeof(addrstr));
788
}
789
if(pcret == NULL){
790
perror_plus("inet_ntop");
791
} else {
792
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
794
}
795
}
796
}
797
798
if(quit_now){
799
errno = EINTR;
800
goto mandos_end;
801
}
802
803
if(af == AF_INET6){
804
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
} else {
806
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
807
}
808
if(ret < 0){
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
int e = errno;
811
perror_plus("connect");
812
errno = e;
813
}
814
goto mandos_end;
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
1080
820
}
1081
821
1082
822
const char *out = mandos_protocol_version;
1265
1005
1266
1006
mandos_end:
1267
1007
{
1268
if(route_added){
1269
if(not remove_local_route(ip, if_index)){
1270
fprintf_plus(stderr, "Failed to remove local route to %s on"
1271
" interface %d", ip, if_index);
1272
}
1273
}
1274
1008
int e = errno;
1275
1009
free(decrypted_buffer);
1276
1010
free(buffer);
1293
1027
return retval;
1294
1028
}
1295
1029
1296
__attribute__((nonnull))
1297
1030
static void resolve_callback(AvahiSServiceResolver *r,
1298
1031
AvahiIfIndex interface,
1299
1032
AvahiProtocol proto,
1307
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
1308
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1309
1042
flags,
1310
void *mc){
1043
void* mc){
1311
1044
if(r == NULL){
1312
1045
return;
1313
1046
}
1316
1049
timed out */
1317
1050
1318
1051
if(quit_now){
1319
avahi_s_service_resolver_free(r);
1320
1052
return;
1321
1053
}
1322
1054
1367
1099
const char *domain,
1368
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1369
1101
flags,
1370
void *mc){
1102
void* mc){
1371
1103
if(b == NULL){
1372
1104
return;
1373
1105
}
1433
1165
errno = old_errno;
1434
1166
}
1435
1167
1436
__attribute__((nonnull, warn_unused_result))
1437
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1438
1169
int ret;
1439
1170
error_t ret_errno;
1458
1189
return true;
1459
1190
}
1460
1191
1461
__attribute__((nonnull, warn_unused_result))
1462
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1463
1193
1464
1194
/* Reject the loopback device */
1506
1236
* corresponds to an acceptable network device.
1507
1237
* (This function is passed to scandir(3) as a filter function.)
1508
1238
*/
1509
__attribute__((nonnull, warn_unused_result))
1510
1239
int good_interface(const struct dirent *if_entry){
1511
1240
if(if_entry->d_name[0] == '.'){
1512
1241
return 0;
1530
1259
/*
1531
1260
* This function determines if a network interface is up.
1532
1261
*/
1533
__attribute__((nonnull, warn_unused_result))
1534
1262
bool interface_is_up(const char *interface){
1535
1263
struct ifreq ifr;
1536
1264
if(not get_flags(interface, &ifr)){
1547
1275
/*
1548
1276
* This function determines if a network interface is running
1549
1277
*/
1550
__attribute__((nonnull, warn_unused_result))
1551
1278
bool interface_is_running(const char *interface){
1552
1279
struct ifreq ifr;
1553
1280
if(not get_flags(interface, &ifr)){
1561
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1562
1289
}
1563
1290
1564
__attribute__((nonnull, pure, warn_unused_result))
1565
1291
int notdotentries(const struct dirent *direntry){
1566
1292
/* Skip "." and ".." */
1567
1293
if(direntry->d_name[0] == '.'
1574
1300
}
1575
1301
1576
1302
/* Is this directory entry a runnable program? */
1577
__attribute__((nonnull, warn_unused_result))
1578
1303
int runnable_hook(const struct dirent *direntry){
1579
1304
int ret;
1580
1305
size_t sret;
1588
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1589
1314
"abcdefghijklmnopqrstuvwxyz"
1590
1315
"0123456789"
1591
"_.-");
1316
"_-");
1592
1317
if((direntry->d_name)[sret] != '\0'){
1593
1318
/* Contains non-allowed characters */
1594
1319
if(debug){
1598
1323
return 0;
1599
1324
}
1600
1325
1601
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1602
1334
if(ret == -1){
1603
1335
if(debug){
1604
1336
perror_plus("Could not stat hook");
1628
1360
return 1;
1629
1361
}
1630
1362
1631
__attribute__((nonnull, warn_unused_result))
1632
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1633
1364
mandos_context *mc){
1634
1365
int ret;
1638
1369
1639
1370
while(true){
1640
1371
if(mc->current_server == NULL){
1641
if(debug){
1372
if (debug){
1642
1373
fprintf_plus(stderr, "Wait until first server is found."
1643
1374
" No timeout!\n");
1644
1375
}
1645
1376
ret = avahi_simple_poll_iterate(s, -1);
1646
1377
} else {
1647
if(debug){
1378
if (debug){
1648
1379
fprintf_plus(stderr, "Check current_server if we should run"
1649
1380
" it, or wait\n");
1650
1381
}
1667
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1668
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1669
1400
1670
if(debug){
1401
if (debug){
1671
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1672
1403
block_time);
1673
1404
}
1695
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1696
1427
}
1697
1428
if(ret != 0){
1698
if(ret > 0 or errno != EINTR){
1429
if (ret > 0 or errno != EINTR){
1699
1430
return (ret != 1) ? ret : 0;
1700
1431
}
1701
1432
}
1702
1433
}
1703
1434
}
1704
1435
1705
__attribute__((nonnull))
1706
void run_network_hooks(const char *mode, const char *interface,
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1707
1489
const float delay){
1708
struct dirent **direntries = NULL;
1709
if(hookdir_fd == -1){
1710
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1711
| O_CLOEXEC);
1712
if(hookdir_fd == -1){
1713
if(errno == ENOENT){
1714
if(debug){
1715
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1716
" found\n", hookdir);
1717
}
1718
} else {
1719
perror_plus("open");
1720
}
1721
return;
1722
}
1723
}
1724
#ifdef __GLIBC__
1725
#if __GLIBC_PREREQ(2, 15)
1726
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1727
runnable_hook, alphasort);
1728
#else /* not __GLIBC_PREREQ(2, 15) */
1729
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1730
alphasort);
1731
#endif /* not __GLIBC_PREREQ(2, 15) */
1732
#else /* not __GLIBC__ */
1733
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1734
alphasort);
1735
#endif /* not __GLIBC__ */
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1736
1495
if(numhooks == -1){
1737
perror_plus("scandir");
1738
return;
1739
}
1740
struct dirent *direntry;
1741
int ret;
1742
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1743
if(devnull == -1){
1744
perror_plus("open(\"/dev/null\", O_RDONLY)");
1745
return;
1746
}
1747
for(int i = 0; i < numhooks; i++){
1748
direntry = direntries[i];
1749
if(debug){
1750
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1751
direntry->d_name);
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1752
1503
}
1753
pid_t hook_pid = fork();
1754
if(hook_pid == 0){
1755
/* Child */
1756
/* Raise privileges */
1757
errno = raise_privileges_permanently();
1758
if(errno != 0){
1759
perror_plus("Failed to raise privileges");
1760
_exit(EX_NOPERM);
1761
}
1762
/* Set group */
1763
errno = 0;
1764
ret = setgid(0);
1765
if(ret == -1){
1766
perror_plus("setgid");
1767
_exit(EX_NOPERM);
1768
}
1769
/* Reset supplementary groups */
1770
errno = 0;
1771
ret = setgroups(0, NULL);
1772
if(ret == -1){
1773
perror_plus("setgroups");
1774
_exit(EX_NOPERM);
1775
}
1776
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1777
if(ret == -1){
1778
perror_plus("setenv");
1779
_exit(EX_OSERR);
1780
}
1781
ret = setenv("DEVICE", interface, 1);
1782
if(ret == -1){
1783
perror_plus("setenv");
1784
_exit(EX_OSERR);
1785
}
1786
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1787
if(ret == -1){
1788
perror_plus("setenv");
1789
_exit(EX_OSERR);
1790
}
1791
ret = setenv("MODE", mode, 1);
1792
if(ret == -1){
1793
perror_plus("setenv");
1794
_exit(EX_OSERR);
1795
}
1796
char *delaystring;
1797
ret = asprintf(&delaystring, "%f", (double)delay);
1798
if(ret == -1){
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1799
1511
perror_plus("asprintf");
1800
_exit(EX_OSERR);
1801
}
1802
ret = setenv("DELAY", delaystring, 1);
1803
if(ret == -1){
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1804
1570
free(delaystring);
1805
perror_plus("setenv");
1806
_exit(EX_OSERR);
1807
}
1808
free(delaystring);
1809
if(connect_to != NULL){
1810
ret = setenv("CONNECT", connect_to, 1);
1811
if(ret == -1){
1812
perror_plus("setenv");
1813
_exit(EX_OSERR);
1814
}
1815
}
1816
int hook_fd = TEMP_FAILURE_RETRY(openat(hookdir_fd,
1817
direntry->d_name,
1818
O_RDONLY));
1819
if(hook_fd == -1){
1820
perror_plus("openat");
1821
_exit(EXIT_FAILURE);
1822
}
1823
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1824
perror_plus("close");
1825
_exit(EXIT_FAILURE);
1826
}
1827
ret = dup2(devnull, STDIN_FILENO);
1828
if(ret == -1){
1829
perror_plus("dup2(devnull, STDIN_FILENO)");
1830
_exit(EX_OSERR);
1831
}
1832
ret = close(devnull);
1833
if(ret == -1){
1834
perror_plus("close");
1835
_exit(EX_OSERR);
1836
}
1837
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1838
if(ret == -1){
1839
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1840
_exit(EX_OSERR);
1841
}
1842
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1843
environ) == -1){
1844
perror_plus("fexecve");
1845
_exit(EXIT_FAILURE);
1846
}
1847
} else {
1848
if(hook_pid == -1){
1849
perror_plus("fork");
1850
free(direntry);
1851
continue;
1852
}
1853
int status;
1854
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1855
perror_plus("waitpid");
1856
free(direntry);
1857
continue;
1858
}
1859
if(WIFEXITED(status)){
1860
if(WEXITSTATUS(status) != 0){
1861
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1862
" with status %d\n", direntry->d_name,
1863
WEXITSTATUS(status));
1864
free(direntry);
1865
continue;
1866
}
1867
} else if(WIFSIGNALED(status)){
1868
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1869
" signal %d\n", direntry->d_name,
1870
WTERMSIG(status));
1871
free(direntry);
1872
continue;
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1873
1582
} else {
1874
fprintf_plus(stderr, "Warning: network hook \"%s\""
1875
" crashed\n", direntry->d_name);
1876
free(direntry);
1877
continue;
1878
}
1879
}
1880
if(debug){
1881
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1882
direntry->d_name);
1883
}
1884
free(direntry);
1885
}
1886
free(direntries);
1887
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1888
perror_plus("close");
1889
} else {
1890
hookdir_fd = -1;
1891
}
1892
close(devnull);
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1893
1619
}
1894
1620
1895
__attribute__((nonnull, warn_unused_result))
1896
1621
error_t bring_up_interface(const char *const interface,
1897
1622
const float delay){
1623
int sd = -1;
1898
1624
error_t old_errno = errno;
1899
int ret;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1900
1627
struct ifreq network;
1901
1628
unsigned int if_index = if_nametoindex(interface);
1902
1629
if(if_index == 0){
1911
1638
}
1912
1639
1913
1640
if(not interface_is_up(interface)){
1914
error_t ret_errno = 0, ioctl_errno = 0;
1915
if(not get_flags(interface, &network)){
1641
if(not get_flags(interface, &network) and debug){
1916
1642
ret_errno = errno;
1917
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1918
1644
"\"%s\"\n", interface);
1919
errno = old_errno;
1920
1645
return ret_errno;
1921
1646
}
1922
network.ifr_flags |= IFF_UP; /* set flag */
1647
network.ifr_flags |= IFF_UP;
1923
1648
1924
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1925
if(sd == -1){
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1926
1651
ret_errno = errno;
1927
1652
perror_plus("socket");
1928
1653
errno = old_errno;
1929
1654
return ret_errno;
1930
1655
}
1931
1656
1932
1657
if(quit_now){
1933
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1934
if(ret == -1){
1935
perror_plus("close");
1936
}
1658
close(sd);
1937
1659
errno = old_errno;
1938
1660
return EINTR;
1939
1661
}
1943
1665
interface);
1944
1666
}
1945
1667
1946
/* Raise privileges */
1947
ret_errno = raise_privileges();
1948
if(ret_errno != 0){
1949
errno = ret_errno;
1950
perror_plus("Failed to raise privileges");
1951
}
1668
/* Raise priviliges */
1669
raise_privileges();
1952
1670
1953
1671
#ifdef __linux__
1954
int ret_linux;
1955
bool restore_loglevel = false;
1956
if(ret_errno == 0){
1957
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1958
messages about the network interface to mess up the prompt */
1959
ret_linux = klogctl(8, NULL, 5);
1960
if(ret_linux == -1){
1961
perror_plus("klogctl");
1962
} else {
1963
restore_loglevel = true;
1964
}
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1965
1679
}
1966
1680
#endif /* __linux__ */
1967
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1968
ioctl_errno = errno;
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1969
1683
#ifdef __linux__
1970
1684
if(restore_loglevel){
1971
1685
ret_linux = klogctl(7, NULL, 0);
1975
1689
}
1976
1690
#endif /* __linux__ */
1977
1691
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1692
/* Lower privileges */
1693
lower_privileges();
1987
1694
1988
1695
/* Close the socket */
1989
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
1699
}
1993
1700
1994
1701
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1702
errno = ret_errno;
1996
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1997
1704
errno = old_errno;
1998
return ioctl_errno;
1705
return ret_errno;
1999
1706
}
2000
1707
} else if(debug){
2001
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2019
1726
return 0;
2020
1727
}
2021
1728
2022
__attribute__((nonnull, warn_unused_result))
2023
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
2024
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
2025
1734
struct ifreq network;
2026
1735
unsigned int if_index = if_nametoindex(interface);
2027
1736
if(if_index == 0){
2030
1739
return ENXIO;
2031
1740
}
2032
1741
if(interface_is_up(interface)){
2033
error_t ret_errno = 0, ioctl_errno = 0;
2034
1742
if(not get_flags(interface, &network) and debug){
2035
1743
ret_errno = errno;
2036
1744
fprintf_plus(stderr, "Failed to get flags for interface "
2037
1745
"\"%s\"\n", interface);
2038
errno = old_errno;
2039
1746
return ret_errno;
2040
1747
}
2041
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2042
1749
2043
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2044
if(sd == -1){
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
2045
1752
ret_errno = errno;
2046
1753
perror_plus("socket");
2047
1754
errno = old_errno;
2053
1760
interface);
2054
1761
}
2055
1762
2056
/* Raise privileges */
2057
ret_errno = raise_privileges();
2058
if(ret_errno != 0){
2059
errno = ret_errno;
2060
perror_plus("Failed to raise privileges");
2061
}
2062
2063
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2064
ioctl_errno = errno;
2065
2066
/* If raise_privileges() succeeded above */
2067
if(ret_errno == 0){
2068
/* Lower privileges */
2069
ret_errno = lower_privileges();
2070
if(ret_errno != 0){
2071
errno = ret_errno;
2072
perror_plus("Failed to lower privileges");
2073
}
2074
}
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
2075
1771
2076
1772
/* Close the socket */
2077
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2078
1774
if(ret == -1){
2079
1775
perror_plus("close");
2080
1776
}
2081
1777
2082
1778
if(ret_setflags == -1){
2083
errno = ioctl_errno;
1779
errno = ret_errno;
2084
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2085
1781
errno = old_errno;
2086
return ioctl_errno;
1782
return ret_errno;
2087
1783
}
2088
1784
} else if(debug){
2089
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2097
1793
int main(int argc, char *argv[]){
2098
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2099
1795
.priority = "SECURE256:!CTYPE-X.509:"
2100
"+CTYPE-OPENPGP", .current_server = NULL,
1796
"+CTYPE-OPENPGP", .current_server = NULL,
2101
1797
.interfaces = NULL, .interfaces_size = 0 };
2102
1798
AvahiSServiceBrowser *sb = NULL;
2103
1799
error_t ret_errno;
2107
1803
int exitcode = EXIT_SUCCESS;
2108
1804
char *interfaces_to_take_down = NULL;
2109
1805
size_t interfaces_to_take_down_size = 0;
2110
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2111
char old_tempdir[] = "/tmp/mandosXXXXXX";
2112
char *tempdir = NULL;
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1807
bool tempdir_created = false;
2113
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2114
1809
const char *seckey = PATHDIR "/" SECKEY;
2115
1810
const char *pubkey = PATHDIR "/" PUBKEY;
2116
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
2117
1813
2118
1814
bool gnutls_initialized = false;
2119
1815
bool gpgme_initialized = false;
2292
1988
goto end;
2293
1989
}
2294
1990
}
2295
1991
2296
1992
{
2297
1993
/* Work around Debian bug #633582:
2298
1994
<http://bugs.debian.org/633582> */
2299
1995
2300
/* Re-raise privileges */
2301
ret_errno = raise_privileges();
2302
if(ret_errno != 0){
2303
errno = ret_errno;
2304
perror_plus("Failed to raise privileges");
2305
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2306
1998
struct stat st;
2307
1999
2308
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2325
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2326
2018
}
2327
2019
}
2328
2020
2329
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2330
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2331
2023
if(pubkey_fd == -1){
2346
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2347
2039
}
2348
2040
}
2349
2041
2350
2042
/* Lower privileges */
2351
ret_errno = lower_privileges();
2352
if(ret_errno != 0){
2353
errno = ret_errno;
2354
perror_plus("Failed to lower privileges");
2355
}
2043
lower_privileges();
2356
2044
}
2357
2045
}
2358
2046
2382
2070
goto end;
2383
2071
}
2384
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2385
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2386
}
2387
run_network_hooks("start", interfaces_hooks != NULL ?
2388
interfaces_hooks : "", delay);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2389
2081
}
2390
2082
2391
2083
if(not debug){
2469
2161
2470
2162
/* If no interfaces were specified, make a list */
2471
2163
if(mc.interfaces == NULL){
2472
struct dirent **direntries = NULL;
2164
struct dirent **direntries;
2473
2165
/* Look for any good interfaces */
2474
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2475
2167
alphasort);
2479
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2480
2172
direntries[i]->d_name);
2481
2173
if(ret_errno != 0){
2482
errno = ret_errno;
2483
2174
perror_plus("argz_add");
2484
free(direntries[i]);
2485
2175
continue;
2486
2176
}
2487
2177
if(debug){
2488
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2489
2179
direntries[i]->d_name);
2490
2180
}
2491
free(direntries[i]);
2492
2181
}
2493
2182
free(direntries);
2494
2183
} else {
2495
if(ret == 0){
2496
free(direntries);
2497
}
2184
free(direntries);
2498
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2499
2186
exitcode = EXIT_FAILURE;
2500
2187
goto end;
2523
2210
break;
2524
2211
}
2525
2212
bool interface_was_up = interface_is_up(interface);
2526
errno = bring_up_interface(interface, delay);
2213
ret = bring_up_interface(interface, delay);
2527
2214
if(not interface_was_up){
2528
if(errno != 0){
2215
if(ret != 0){
2216
errno = ret;
2529
2217
perror_plus("Failed to bring up interface");
2530
2218
} else {
2531
errno = argz_add(&interfaces_to_take_down,
2532
&interfaces_to_take_down_size,
2533
interface);
2534
if(errno != 0){
2535
perror_plus("argz_add");
2536
}
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2537
2222
}
2538
2223
}
2539
2224
}
2568
2253
goto end;
2569
2254
}
2570
2255
2571
/* Try /run/tmp before /tmp */
2572
tempdir = mkdtemp(run_tempdir);
2573
if(tempdir == NULL and errno == ENOENT){
2574
if(debug){
2575
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2576
run_tempdir, old_tempdir);
2577
}
2578
tempdir = mkdtemp(old_tempdir);
2579
}
2580
if(tempdir == NULL){
2256
if(mkdtemp(tempdir) == NULL){
2581
2257
perror_plus("mkdtemp");
2582
2258
goto end;
2583
2259
}
2260
tempdir_created = true;
2584
2261
2585
2262
if(quit_now){
2586
2263
goto end;
2661
2338
sleep((unsigned int)retry_interval);
2662
2339
}
2663
2340
2664
if(not quit_now){
2341
if (not quit_now){
2665
2342
exitcode = EXIT_SUCCESS;
2666
2343
}
2667
2344
2722
2399
if(debug){
2723
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2724
2401
}
2725
2402
2726
2403
ret = avahi_loop_with_timeout(simple_poll,
2727
2404
(int)(retry_interval * 1000), &mc);
2728
2405
if(debug){
2764
2441
mc.current_server->prev->next = NULL;
2765
2442
while(mc.current_server != NULL){
2766
2443
server *next = mc.current_server->next;
2767
#ifdef __GNUC__
2768
#pragma GCC diagnostic push
2769
#pragma GCC diagnostic ignored "-Wcast-qual"
2770
#endif
2771
free((char *)(mc.current_server->ip));
2772
#ifdef __GNUC__
2773
#pragma GCC diagnostic pop
2774
#endif
2775
2444
free(mc.current_server);
2776
2445
mc.current_server = next;
2777
2446
}
2778
2447
}
2779
2448
2780
/* Re-raise privileges */
2449
/* Re-raise priviliges */
2781
2450
{
2782
ret_errno = raise_privileges();
2783
if(ret_errno != 0){
2784
errno = ret_errno;
2785
perror_plus("Failed to raise privileges");
2786
} else {
2787
2788
/* Run network hooks */
2789
run_network_hooks("stop", interfaces_hooks != NULL ?
2790
interfaces_hooks : "", delay);
2791
2792
/* Take down the network interfaces which were brought up */
2793
{
2794
char *interface = NULL;
2795
while((interface=argz_next(interfaces_to_take_down,
2796
interfaces_to_take_down_size,
2797
interface))){
2798
ret_errno = take_down_interface(interface);
2799
if(ret_errno != 0){
2800
errno = ret_errno;
2801
perror_plus("Failed to take down interface");
2802
}
2803
}
2804
if(debug and (interfaces_to_take_down == NULL)){
2805
fprintf_plus(stderr, "No interfaces needed to be taken"
2806
" down\n");
2807
}
2808
}
2809
}
2810
2811
ret_errno = lower_privileges_permanently();
2812
if(ret_errno != 0){
2813
errno = ret_errno;
2814
perror_plus("Failed to lower privileges permanently");
2815
}
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
2467
}
2468
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2472
}
2473
}
2474
2475
lower_privileges_permanently();
2816
2476
}
2817
2477
2818
2478
free(interfaces_to_take_down);
2819
2479
free(interfaces_hooks);
2820
2480
2821
2481
/* Removes the GPGME temp directory and all files inside */
2822
if(tempdir != NULL){
2482
if(tempdir_created){
2823
2483
struct dirent **direntries = NULL;
2824
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2825
| O_NOFOLLOW
2826
| O_DIRECTORY
2827
| O_PATH));
2828
if(tempdir_fd == -1){
2829
perror_plus("open");
2830
} else {
2831
#ifdef __GLIBC__
2832
#if __GLIBC_PREREQ(2, 15)
2833
int numentries = scandirat(tempdir_fd, ".", &direntries,
2834
notdotentries, alphasort);
2835
#else /* not __GLIBC_PREREQ(2, 15) */
2836
int numentries = scandir(tempdir, &direntries, notdotentries,
2837
alphasort);
2838
#endif /* not __GLIBC_PREREQ(2, 15) */
2839
#else /* not __GLIBC__ */
2840
int numentries = scandir(tempdir, &direntries, notdotentries,
2841
alphasort);
2842
#endif /* not __GLIBC__ */
2843
if(numentries >= 0){
2844
for(int i = 0; i < numentries; i++){
2845
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2846
if(ret == -1){
2847
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2848
" \"%s\", 0): %s\n", tempdir,
2849
direntries[i]->d_name, strerror(errno));
2850
}
2851
free(direntries[i]);
2852
}
2853
2854
/* need to clean even if 0 because man page doesn't specify */
2855
free(direntries);
2856
if(numentries == -1){
2857
perror_plus("scandir");
2858
}
2859
ret = rmdir(tempdir);
2860
if(ret == -1 and errno != ENOENT){
2861
perror_plus("rmdir");
2862
}
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
2489
direntry = direntries[i];
2490
char *fullname = NULL;
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
direntry->d_name);
2493
if(ret < 0){
2494
perror_plus("asprintf");
2495
continue;
2496
}
2497
ret = remove(fullname);
2498
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2501
}
2502
free(fullname);
2863
2503
}
2864
TEMP_FAILURE_RETRY(close(tempdir_fd));
2504
}
2505
2506
/* need to clean even if 0 because man page doesn't specify */
2507
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
2510
}
2511
ret = rmdir(tempdir);
2512
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
2865
2514
}
2866
2515
}
2867
2516
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0