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- Committer: Teddy Hogeborn
- Date: 2013-10-27 17:42:23 UTC
- Revision ID: teddy@recompile.se-20131027174223-mq3a1h8xi5jcv9e6
Bug fix: Make sure systemd service file is installed.
* Makefile (install-server): Fix typo causing syntax error.
* debian/mandos.dirs (lib/systemd/system): New.
* Makefile (install-server): Fix typo causing syntax error.
* debian/mandos.dirs (lib/systemd/system): New.
- 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 delete_arg[] = "delete";
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 = (int)TEMP_FAILURE_RETRY(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
if(helperdir_fd == -1){
779
perror_plus("open");
780
_exit(EX_UNAVAILABLE);
781
}
782
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
783
helper, O_RDONLY));
784
if(helper_fd == -1){
785
perror_plus("openat");
786
_exit(EX_UNAVAILABLE);
787
}
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
789
#ifdef __GNUC__
790
#pragma GCC diagnostic push
791
#pragma GCC diagnostic ignored "-Wcast-qual"
792
#endif
793
if(fexecve(helper_fd, (char *const [])
794
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
796
#ifdef __GNUC__
797
#pragma GCC diagnostic pop
798
#endif
799
perror_plus("fexecve");
800
_exit(EXIT_FAILURE);
801
}
802
}
803
if(pid == -1){
804
perror_plus("fork");
805
return false;
806
}
807
int status;
808
pid_t pret = -1;
809
errno = 0;
810
do {
811
pret = waitpid(pid, &status, 0);
812
if(pret == -1 and errno == EINTR and quit_now){
813
int errno_raising = 0;
814
if((errno = raise_privileges()) != 0){
815
errno_raising = errno;
816
perror_plus("Failed to raise privileges in order to"
817
" kill helper program");
818
}
819
if(kill(pid, SIGTERM) == -1){
820
perror_plus("kill");
821
}
822
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
823
perror_plus("Failed to lower privileges after killing"
824
" helper program");
825
}
826
return false;
827
}
828
} while(pret == -1 and errno == EINTR);
829
if(pret == -1){
830
perror_plus("waitpid");
831
return false;
832
}
833
if(WIFEXITED(status)){
834
if(WEXITSTATUS(status) != 0){
835
fprintf_plus(stderr, "Error: iprouteadddel exited"
836
" with status %d\n", WEXITSTATUS(status));
837
return false;
838
}
839
return true;
840
}
841
if(WIFSIGNALED(status)){
842
fprintf_plus(stderr, "Error: iprouteadddel died by"
843
" signal %d\n", WTERMSIG(status));
844
return false;
845
}
846
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
847
return false;
848
}
849
850
__attribute__((nonnull, warn_unused_result))
851
static bool add_local_route(const char *address,
852
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
854
}
855
856
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
858
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
860
}
861
862
623
/* Called when a Mandos server is found */
863
__attribute__((nonnull, warn_unused_result))
864
624
static int start_mandos_communication(const char *ip, in_port_t port,
865
625
AvahiIfIndex if_index,
866
626
int af, mandos_context *mc){
867
627
int ret, tcp_sd = -1;
868
628
ssize_t sret;
869
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
870
633
char *buffer = NULL;
871
634
char *decrypted_buffer = NULL;
872
635
size_t buffer_length = 0;
875
638
int retval = -1;
876
639
gnutls_session_t session;
877
640
int pf; /* Protocol family */
878
bool route_added = false;
879
641
880
642
errno = 0;
881
643
939
701
PRIuMAX "\n", ip, (uintmax_t)port);
940
702
}
941
703
942
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
943
705
if(tcp_sd < 0){
944
706
int e = errno;
945
707
perror_plus("socket");
954
716
955
717
memset(&to, 0, sizeof(to));
956
718
if(af == AF_INET6){
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
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);
959
721
} else { /* IPv4 */
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
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);
962
724
}
963
725
if(ret < 0 ){
964
726
int e = errno;
973
735
goto mandos_end;
974
736
}
975
737
if(af == AF_INET6){
976
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
977
if(IN6_IS_ADDR_LINKLOCAL
978
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
979
742
if(if_index == AVAHI_IF_UNSPEC){
980
743
fprintf_plus(stderr, "An IPv6 link-local address is"
981
744
" incomplete without a network interface\n");
983
746
goto mandos_end;
984
747
}
985
748
/* Set the network interface number as scope */
986
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
987
750
}
988
751
} else {
989
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
990
755
}
991
756
992
757
if(quit_now){
1009
774
}
1010
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1011
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1012
if(af == AF_INET6){
1013
ret = getnameinfo((struct sockaddr *)&to,
1014
sizeof(struct sockaddr_in6),
1015
addrstr, sizeof(addrstr), NULL, 0,
1016
NI_NUMERICHOST);
1017
} else {
1018
ret = getnameinfo((struct sockaddr *)&to,
1019
sizeof(struct sockaddr_in),
1020
addrstr, sizeof(addrstr), NULL, 0,
1021
NI_NUMERICHOST);
1022
}
1023
if(ret == EAI_SYSTEM){
1024
perror_plus("getnameinfo");
1025
} else if(ret != 0) {
1026
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1027
} else if(strcmp(addrstr, ip) != 0){
1028
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1029
}
1030
}
1031
1032
if(quit_now){
1033
errno = EINTR;
1034
goto mandos_end;
1035
}
1036
1037
while(true){
1038
if(af == AF_INET6){
1039
ret = connect(tcp_sd, (struct sockaddr *)&to,
1040
sizeof(struct sockaddr_in6));
1041
} else {
1042
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1043
sizeof(struct sockaddr_in));
1044
}
1045
if(ret < 0){
1046
if(errno == ENETUNREACH
1047
and if_index != AVAHI_IF_UNSPEC
1048
and connect_to == NULL
1049
and not route_added and
1050
((af == AF_INET6 and not
1051
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1052
&to)->sin6_addr)))
1053
or (af == AF_INET and
1054
/* Not a a IPv4LL address */
1055
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1056
& 0xFFFF0000L) != 0xA9FE0000L))){
1057
/* Work around Avahi bug - Avahi does not announce link-local
1058
addresses if it has a global address, so local hosts with
1059
*only* a link-local address (e.g. Mandos clients) cannot
1060
connect to a Mandos server announced by Avahi on a server
1061
host with a global address. Work around this by retrying
1062
with an explicit route added with the server's address.
1063
1064
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
https://bugs.debian.org/587961
1067
*/
1068
int e = errno;
1069
route_added = add_local_route(ip, if_index);
1070
if(route_added){
1071
continue;
1072
}
1073
errno = e;
1074
}
1075
if(errno != ECONNREFUSED or debug){
1076
int e = errno;
1077
perror_plus("connect");
1078
errno = e;
1079
}
1080
goto mandos_end;
1081
}
1082
1083
if(quit_now){
1084
errno = EINTR;
1085
goto mandos_end;
1086
}
1087
break;
777
const char *pcret;
778
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
781
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
784
}
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
787
} else {
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
790
}
791
}
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
799
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
801
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
803
}
804
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
int e = errno;
807
perror_plus("connect");
808
errno = e;
809
}
810
goto mandos_end;
811
}
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
1088
816
}
1089
817
1090
818
const char *out = mandos_protocol_version;
1273
1001
1274
1002
mandos_end:
1275
1003
{
1276
if(route_added){
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1279
" interface %d", ip, if_index);
1280
}
1281
}
1282
1004
int e = errno;
1283
1005
free(decrypted_buffer);
1284
1006
free(buffer);
1301
1023
return retval;
1302
1024
}
1303
1025
1304
__attribute__((nonnull))
1305
1026
static void resolve_callback(AvahiSServiceResolver *r,
1306
1027
AvahiIfIndex interface,
1307
1028
AvahiProtocol proto,
1315
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1316
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1317
1038
flags,
1318
void *mc){
1039
void* mc){
1319
1040
if(r == NULL){
1320
1041
return;
1321
1042
}
1324
1045
timed out */
1325
1046
1326
1047
if(quit_now){
1327
avahi_s_service_resolver_free(r);
1328
1048
return;
1329
1049
}
1330
1050
1375
1095
const char *domain,
1376
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1377
1097
flags,
1378
void *mc){
1098
void* mc){
1379
1099
if(b == NULL){
1380
1100
return;
1381
1101
}
1441
1161
errno = old_errno;
1442
1162
}
1443
1163
1444
__attribute__((nonnull, warn_unused_result))
1445
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1446
1165
int ret;
1447
1166
error_t ret_errno;
1466
1185
return true;
1467
1186
}
1468
1187
1469
__attribute__((nonnull, warn_unused_result))
1470
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1471
1189
1472
1190
/* Reject the loopback device */
1514
1232
* corresponds to an acceptable network device.
1515
1233
* (This function is passed to scandir(3) as a filter function.)
1516
1234
*/
1517
__attribute__((nonnull, warn_unused_result))
1518
1235
int good_interface(const struct dirent *if_entry){
1519
1236
if(if_entry->d_name[0] == '.'){
1520
1237
return 0;
1538
1255
/*
1539
1256
* This function determines if a network interface is up.
1540
1257
*/
1541
__attribute__((nonnull, warn_unused_result))
1542
1258
bool interface_is_up(const char *interface){
1543
1259
struct ifreq ifr;
1544
1260
if(not get_flags(interface, &ifr)){
1555
1271
/*
1556
1272
* This function determines if a network interface is running
1557
1273
*/
1558
__attribute__((nonnull, warn_unused_result))
1559
1274
bool interface_is_running(const char *interface){
1560
1275
struct ifreq ifr;
1561
1276
if(not get_flags(interface, &ifr)){
1569
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1570
1285
}
1571
1286
1572
__attribute__((nonnull, pure, warn_unused_result))
1573
1287
int notdotentries(const struct dirent *direntry){
1574
1288
/* Skip "." and ".." */
1575
1289
if(direntry->d_name[0] == '.'
1582
1296
}
1583
1297
1584
1298
/* Is this directory entry a runnable program? */
1585
__attribute__((nonnull, warn_unused_result))
1586
1299
int runnable_hook(const struct dirent *direntry){
1587
1300
int ret;
1588
1301
size_t sret;
1596
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1597
1310
"abcdefghijklmnopqrstuvwxyz"
1598
1311
"0123456789"
1599
"_.-");
1312
"_-");
1600
1313
if((direntry->d_name)[sret] != '\0'){
1601
1314
/* Contains non-allowed characters */
1602
1315
if(debug){
1606
1319
return 0;
1607
1320
}
1608
1321
1609
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1610
1330
if(ret == -1){
1611
1331
if(debug){
1612
1332
perror_plus("Could not stat hook");
1636
1356
return 1;
1637
1357
}
1638
1358
1639
__attribute__((nonnull, warn_unused_result))
1640
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1641
1360
mandos_context *mc){
1642
1361
int ret;
1646
1365
1647
1366
while(true){
1648
1367
if(mc->current_server == NULL){
1649
if(debug){
1368
if (debug){
1650
1369
fprintf_plus(stderr, "Wait until first server is found."
1651
1370
" No timeout!\n");
1652
1371
}
1653
1372
ret = avahi_simple_poll_iterate(s, -1);
1654
1373
} else {
1655
if(debug){
1374
if (debug){
1656
1375
fprintf_plus(stderr, "Check current_server if we should run"
1657
1376
" it, or wait\n");
1658
1377
}
1675
1394
- ((intmax_t)waited_time.tv_sec * 1000))
1676
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1677
1396
1678
if(debug){
1397
if (debug){
1679
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1680
1399
block_time);
1681
1400
}
1703
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1704
1423
}
1705
1424
if(ret != 0){
1706
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
1707
1426
return (ret != 1) ? ret : 0;
1708
1427
}
1709
1428
}
1710
1429
}
1711
1430
}
1712
1431
1713
__attribute__((nonnull))
1714
void run_network_hooks(const char *mode, const char *interface,
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1715
1485
const float delay){
1716
struct dirent **direntries = NULL;
1717
if(hookdir_fd == -1){
1718
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1719
| O_CLOEXEC);
1720
if(hookdir_fd == -1){
1721
if(errno == ENOENT){
1722
if(debug){
1723
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1724
" found\n", hookdir);
1725
}
1726
} else {
1727
perror_plus("open");
1728
}
1729
return;
1730
}
1731
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1744
1491
if(numhooks == -1){
1745
perror_plus("scandir");
1746
return;
1747
}
1748
struct dirent *direntry;
1749
int ret;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1751
if(devnull == -1){
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1753
return;
1754
}
1755
for(int i = 0; i < numhooks; i++){
1756
direntry = direntries[i];
1757
if(debug){
1758
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1759
direntry->d_name);
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1760
1499
}
1761
pid_t hook_pid = fork();
1762
if(hook_pid == 0){
1763
/* Child */
1764
/* Raise privileges */
1765
errno = raise_privileges_permanently();
1766
if(errno != 0){
1767
perror_plus("Failed to raise privileges");
1768
_exit(EX_NOPERM);
1769
}
1770
/* Set group */
1771
errno = 0;
1772
ret = setgid(0);
1773
if(ret == -1){
1774
perror_plus("setgid");
1775
_exit(EX_NOPERM);
1776
}
1777
/* Reset supplementary groups */
1778
errno = 0;
1779
ret = setgroups(0, NULL);
1780
if(ret == -1){
1781
perror_plus("setgroups");
1782
_exit(EX_NOPERM);
1783
}
1784
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1785
if(ret == -1){
1786
perror_plus("setenv");
1787
_exit(EX_OSERR);
1788
}
1789
ret = setenv("DEVICE", interface, 1);
1790
if(ret == -1){
1791
perror_plus("setenv");
1792
_exit(EX_OSERR);
1793
}
1794
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1795
if(ret == -1){
1796
perror_plus("setenv");
1797
_exit(EX_OSERR);
1798
}
1799
ret = setenv("MODE", mode, 1);
1800
if(ret == -1){
1801
perror_plus("setenv");
1802
_exit(EX_OSERR);
1803
}
1804
char *delaystring;
1805
ret = asprintf(&delaystring, "%f", (double)delay);
1806
if(ret == -1){
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1807
1507
perror_plus("asprintf");
1808
_exit(EX_OSERR);
1809
}
1810
ret = setenv("DELAY", delaystring, 1);
1811
if(ret == -1){
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
1812
1566
free(delaystring);
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
free(delaystring);
1817
if(connect_to != NULL){
1818
ret = setenv("CONNECT", connect_to, 1);
1819
if(ret == -1){
1820
perror_plus("setenv");
1821
_exit(EX_OSERR);
1822
}
1823
}
1824
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1825
direntry->d_name,
1826
O_RDONLY));
1827
if(hook_fd == -1){
1828
perror_plus("openat");
1829
_exit(EXIT_FAILURE);
1830
}
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1832
perror_plus("close");
1833
_exit(EXIT_FAILURE);
1834
}
1835
ret = dup2(devnull, STDIN_FILENO);
1836
if(ret == -1){
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
1838
_exit(EX_OSERR);
1839
}
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1841
if(ret == -1){
1842
perror_plus("close");
1843
_exit(EX_OSERR);
1844
}
1845
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1846
if(ret == -1){
1847
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1848
_exit(EX_OSERR);
1849
}
1850
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1851
environ) == -1){
1852
perror_plus("fexecve");
1853
_exit(EXIT_FAILURE);
1854
}
1855
} else {
1856
if(hook_pid == -1){
1857
perror_plus("fork");
1858
free(direntry);
1859
continue;
1860
}
1861
int status;
1862
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1863
perror_plus("waitpid");
1864
free(direntry);
1865
continue;
1866
}
1867
if(WIFEXITED(status)){
1868
if(WEXITSTATUS(status) != 0){
1869
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1870
" with status %d\n", direntry->d_name,
1871
WEXITSTATUS(status));
1872
free(direntry);
1873
continue;
1874
}
1875
} else if(WIFSIGNALED(status)){
1876
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1877
" signal %d\n", direntry->d_name,
1878
WTERMSIG(status));
1879
free(direntry);
1880
continue;
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1881
1578
} else {
1882
fprintf_plus(stderr, "Warning: network hook \"%s\""
1883
" crashed\n", direntry->d_name);
1884
free(direntry);
1885
continue;
1886
}
1887
}
1888
if(debug){
1889
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1890
direntry->d_name);
1891
}
1892
free(direntry);
1893
}
1894
free(direntries);
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1896
perror_plus("close");
1897
} else {
1898
hookdir_fd = -1;
1899
}
1900
close(devnull);
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
1901
1615
}
1902
1616
1903
__attribute__((nonnull, warn_unused_result))
1904
1617
error_t bring_up_interface(const char *const interface,
1905
1618
const float delay){
1619
int sd = -1;
1906
1620
error_t old_errno = errno;
1907
int ret;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1908
1623
struct ifreq network;
1909
1624
unsigned int if_index = if_nametoindex(interface);
1910
1625
if(if_index == 0){
1919
1634
}
1920
1635
1921
1636
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
1923
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
1924
1638
ret_errno = errno;
1925
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1926
1640
"\"%s\"\n", interface);
1927
errno = old_errno;
1928
1641
return ret_errno;
1929
1642
}
1930
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
1931
1644
1932
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd == -1){
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1934
1647
ret_errno = errno;
1935
1648
perror_plus("socket");
1936
1649
errno = old_errno;
1937
1650
return ret_errno;
1938
1651
}
1939
1652
1940
1653
if(quit_now){
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1942
if(ret == -1){
1943
perror_plus("close");
1944
}
1654
close(sd);
1945
1655
errno = old_errno;
1946
1656
return EINTR;
1947
1657
}
1951
1661
interface);
1952
1662
}
1953
1663
1954
/* Raise privileges */
1955
ret_errno = raise_privileges();
1956
if(ret_errno != 0){
1957
errno = ret_errno;
1958
perror_plus("Failed to raise privileges");
1959
}
1664
/* Raise priviliges */
1665
raise_privileges();
1960
1666
1961
1667
#ifdef __linux__
1962
int ret_linux;
1963
bool restore_loglevel = false;
1964
if(ret_errno == 0){
1965
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1966
messages about the network interface to mess up the prompt */
1967
ret_linux = klogctl(8, NULL, 5);
1968
if(ret_linux == -1){
1969
perror_plus("klogctl");
1970
} else {
1971
restore_loglevel = true;
1972
}
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1973
1675
}
1974
1676
#endif /* __linux__ */
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1977
1679
#ifdef __linux__
1978
1680
if(restore_loglevel){
1979
1681
ret_linux = klogctl(7, NULL, 0);
1983
1685
}
1984
1686
#endif /* __linux__ */
1985
1687
1986
/* If raise_privileges() succeeded above */
1987
if(ret_errno == 0){
1988
/* Lower privileges */
1989
ret_errno = lower_privileges();
1990
if(ret_errno != 0){
1991
errno = ret_errno;
1992
perror_plus("Failed to lower privileges");
1993
}
1994
}
1688
/* Lower privileges */
1689
lower_privileges();
1995
1690
1996
1691
/* Close the socket */
1997
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
1695
}
2001
1696
2002
1697
if(ret_setflags == -1){
2003
errno = ioctl_errno;
1698
errno = ret_errno;
2004
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2005
1700
errno = old_errno;
2006
return ioctl_errno;
1701
return ret_errno;
2007
1702
}
2008
1703
} else if(debug){
2009
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2027
1722
return 0;
2028
1723
}
2029
1724
2030
__attribute__((nonnull, warn_unused_result))
2031
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
2032
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
2033
1730
struct ifreq network;
2034
1731
unsigned int if_index = if_nametoindex(interface);
2035
1732
if(if_index == 0){
2038
1735
return ENXIO;
2039
1736
}
2040
1737
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
1738
if(not get_flags(interface, &network) and debug){
2043
1739
ret_errno = errno;
2044
1740
fprintf_plus(stderr, "Failed to get flags for interface "
2045
1741
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
1742
return ret_errno;
2048
1743
}
2049
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2050
1745
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2053
1748
ret_errno = errno;
2054
1749
perror_plus("socket");
2055
1750
errno = old_errno;
2061
1756
interface);
2062
1757
}
2063
1758
2064
/* Raise privileges */
2065
ret_errno = raise_privileges();
2066
if(ret_errno != 0){
2067
errno = ret_errno;
2068
perror_plus("Failed to raise privileges");
2069
}
2070
2071
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2072
ioctl_errno = errno;
2073
2074
/* If raise_privileges() succeeded above */
2075
if(ret_errno == 0){
2076
/* Lower privileges */
2077
ret_errno = lower_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to lower privileges");
2081
}
2082
}
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
2083
1767
2084
1768
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2086
1770
if(ret == -1){
2087
1771
perror_plus("close");
2088
1772
}
2089
1773
2090
1774
if(ret_setflags == -1){
2091
errno = ioctl_errno;
1775
errno = ret_errno;
2092
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2093
1777
errno = old_errno;
2094
return ioctl_errno;
1778
return ret_errno;
2095
1779
}
2096
1780
} else if(debug){
2097
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2105
1789
int main(int argc, char *argv[]){
2106
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
1791
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
1792
"+CTYPE-OPENPGP", .current_server = NULL,
2109
1793
.interfaces = NULL, .interfaces_size = 0 };
2110
1794
AvahiSServiceBrowser *sb = NULL;
2111
1795
error_t ret_errno;
2115
1799
int exitcode = EXIT_SUCCESS;
2116
1800
char *interfaces_to_take_down = NULL;
2117
1801
size_t interfaces_to_take_down_size = 0;
2118
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2119
char old_tempdir[] = "/tmp/mandosXXXXXX";
2120
char *tempdir = NULL;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2121
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2122
1805
const char *seckey = PATHDIR "/" SECKEY;
2123
1806
const char *pubkey = PATHDIR "/" PUBKEY;
2124
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
2125
1809
2126
1810
bool gnutls_initialized = false;
2127
1811
bool gpgme_initialized = false;
2300
1984
goto end;
2301
1985
}
2302
1986
}
2303
1987
2304
1988
{
2305
1989
/* Work around Debian bug #633582:
2306
1990
<http://bugs.debian.org/633582> */
2307
1991
2308
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2312
perror_plus("Failed to raise privileges");
2313
} else {
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2314
1994
struct stat st;
2315
1995
2316
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2333
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2334
2014
}
2335
2015
}
2336
2016
2337
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2338
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2339
2019
if(pubkey_fd == -1){
2354
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2355
2035
}
2356
2036
}
2357
2037
2358
2038
/* Lower privileges */
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2362
perror_plus("Failed to lower privileges");
2363
}
2039
lower_privileges();
2364
2040
}
2365
2041
}
2366
2042
2390
2066
goto end;
2391
2067
}
2392
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2393
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2394
}
2395
run_network_hooks("start", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2397
2077
}
2398
2078
2399
2079
if(not debug){
2477
2157
2478
2158
/* If no interfaces were specified, make a list */
2479
2159
if(mc.interfaces == NULL){
2480
struct dirent **direntries = NULL;
2160
struct dirent **direntries;
2481
2161
/* Look for any good interfaces */
2482
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2483
2163
alphasort);
2487
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2488
2168
direntries[i]->d_name);
2489
2169
if(ret_errno != 0){
2490
errno = ret_errno;
2491
2170
perror_plus("argz_add");
2492
free(direntries[i]);
2493
2171
continue;
2494
2172
}
2495
2173
if(debug){
2496
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2497
2175
direntries[i]->d_name);
2498
2176
}
2499
free(direntries[i]);
2500
2177
}
2501
2178
free(direntries);
2502
2179
} else {
2503
if(ret == 0){
2504
free(direntries);
2505
}
2180
free(direntries);
2506
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2507
2182
exitcode = EXIT_FAILURE;
2508
2183
goto end;
2531
2206
break;
2532
2207
}
2533
2208
bool interface_was_up = interface_is_up(interface);
2534
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2535
2210
if(not interface_was_up){
2536
if(errno != 0){
2211
if(ret != 0){
2212
errno = ret;
2537
2213
perror_plus("Failed to bring up interface");
2538
2214
} else {
2539
errno = argz_add(&interfaces_to_take_down,
2540
&interfaces_to_take_down_size,
2541
interface);
2542
if(errno != 0){
2543
perror_plus("argz_add");
2544
}
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2545
2218
}
2546
2219
}
2547
2220
}
2576
2249
goto end;
2577
2250
}
2578
2251
2579
/* Try /run/tmp before /tmp */
2580
tempdir = mkdtemp(run_tempdir);
2581
if(tempdir == NULL and errno == ENOENT){
2582
if(debug){
2583
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2584
run_tempdir, old_tempdir);
2585
}
2586
tempdir = mkdtemp(old_tempdir);
2587
}
2588
if(tempdir == NULL){
2252
if(mkdtemp(tempdir) == NULL){
2589
2253
perror_plus("mkdtemp");
2590
2254
goto end;
2591
2255
}
2256
tempdir_created = true;
2592
2257
2593
2258
if(quit_now){
2594
2259
goto end;
2669
2334
sleep((unsigned int)retry_interval);
2670
2335
}
2671
2336
2672
if(not quit_now){
2337
if (not quit_now){
2673
2338
exitcode = EXIT_SUCCESS;
2674
2339
}
2675
2340
2730
2395
if(debug){
2731
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2732
2397
}
2733
2398
2734
2399
ret = avahi_loop_with_timeout(simple_poll,
2735
2400
(int)(retry_interval * 1000), &mc);
2736
2401
if(debug){
2772
2437
mc.current_server->prev->next = NULL;
2773
2438
while(mc.current_server != NULL){
2774
2439
server *next = mc.current_server->next;
2775
#ifdef __GNUC__
2776
#pragma GCC diagnostic push
2777
#pragma GCC diagnostic ignored "-Wcast-qual"
2778
#endif
2779
free((char *)(mc.current_server->ip));
2780
#ifdef __GNUC__
2781
#pragma GCC diagnostic pop
2782
#endif
2783
2440
free(mc.current_server);
2784
2441
mc.current_server = next;
2785
2442
}
2786
2443
}
2787
2444
2788
/* Re-raise privileges */
2445
/* Re-raise priviliges */
2789
2446
{
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
2793
perror_plus("Failed to raise privileges");
2794
} else {
2795
2796
/* Run network hooks */
2797
run_network_hooks("stop", interfaces_hooks != NULL ?
2798
interfaces_hooks : "", delay);
2799
2800
/* Take down the network interfaces which were brought up */
2801
{
2802
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2805
interface))){
2806
ret_errno = take_down_interface(interface);
2807
if(ret_errno != 0){
2808
errno = ret_errno;
2809
perror_plus("Failed to take down interface");
2810
}
2811
}
2812
if(debug and (interfaces_to_take_down == NULL)){
2813
fprintf_plus(stderr, "No interfaces needed to be taken"
2814
" down\n");
2815
}
2816
}
2817
}
2818
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
2822
perror_plus("Failed to lower privileges permanently");
2823
}
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
2824
2472
}
2825
2473
2826
2474
free(interfaces_to_take_down);
2827
2475
free(interfaces_hooks);
2828
2476
2829
2477
/* Removes the GPGME temp directory and all files inside */
2830
if(tempdir != NULL){
2478
if(tempdir_created){
2831
2479
struct dirent **direntries = NULL;
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
2484
for(int i = 0; i < numentries; i++){
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2871
2499
}
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2873
2510
}
2874
2511
}
2875
2512
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0