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- Committer: Teddy Hogeborn
- Date: 2014-02-22 17:13:00 UTC
- Revision ID: teddy@recompile.se-20140222171300-a1alb0w871t1f174
* mandos (ClientDBus.start_checker): Removed unused variable
"old_checker".
* mandos-monitor: Remove import of unused module "signal"
"old_checker".
* mandos-monitor: Remove import of unused module "signal"
- 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 delete_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_delete_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 debug_flag[] = "--debug";
715
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
716
if(pluginhelperdir == NULL){
717
if(debug){
718
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
719
" variable not set; cannot run helper\n");
720
}
721
return false;
722
}
723
724
char interface[IF_NAMESIZE];
725
if(if_indextoname((unsigned int)if_index, interface) == NULL){
726
perror_plus("if_indextoname");
727
return false;
728
}
729
730
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
if(devnull == -1){
732
perror_plus("open(\"/dev/null\", O_RDONLY)");
733
return false;
734
}
735
pid_t pid = fork();
736
if(pid == 0){
737
/* Child */
738
/* Raise privileges */
739
errno = raise_privileges_permanently();
740
if(errno != 0){
741
perror_plus("Failed to raise privileges");
742
/* _exit(EX_NOPERM); */
743
} else {
744
/* Set group */
745
errno = 0;
746
ret = setgid(0);
747
if(ret == -1){
748
perror_plus("setgid");
749
_exit(EX_NOPERM);
750
}
751
/* Reset supplementary groups */
752
errno = 0;
753
ret = setgroups(0, NULL);
754
if(ret == -1){
755
perror_plus("setgroups");
756
_exit(EX_NOPERM);
757
}
758
}
759
ret = dup2(devnull, STDIN_FILENO);
760
if(ret == -1){
761
perror_plus("dup2(devnull, STDIN_FILENO)");
762
_exit(EX_OSERR);
763
}
764
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
765
if(ret == -1){
766
perror_plus("close");
767
_exit(EX_OSERR);
768
}
769
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
if(ret == -1){
771
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
772
_exit(EX_OSERR);
773
}
774
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
775
O_RDONLY
776
| O_DIRECTORY
777
| O_PATH
778
| O_CLOEXEC));
779
if(helperdir_fd == -1){
780
perror_plus("open");
781
_exit(EX_UNAVAILABLE);
782
}
783
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
784
helper, O_RDONLY));
785
if(helper_fd == -1){
786
perror_plus("openat");
787
_exit(EX_UNAVAILABLE);
788
}
789
TEMP_FAILURE_RETRY(close(helperdir_fd));
790
#ifdef __GNUC__
791
#pragma GCC diagnostic push
792
#pragma GCC diagnostic ignored "-Wcast-qual"
793
#endif
794
if(fexecve(helper_fd, (char *const [])
795
{ helper, add ? add_arg : delete_arg, (char *)address,
796
interface, debug ? debug_flag : NULL, NULL },
797
environ) == -1){
798
#ifdef __GNUC__
799
#pragma GCC diagnostic pop
800
#endif
801
perror_plus("fexecve");
802
_exit(EXIT_FAILURE);
803
}
804
}
805
if(pid == -1){
806
perror_plus("fork");
807
return false;
808
}
809
int status;
810
pid_t pret = -1;
811
errno = 0;
812
do {
813
pret = waitpid(pid, &status, 0);
814
if(pret == -1 and errno == EINTR and quit_now){
815
int errno_raising = 0;
816
if((errno = raise_privileges()) != 0){
817
errno_raising = errno;
818
perror_plus("Failed to raise privileges in order to"
819
" kill helper program");
820
}
821
if(kill(pid, SIGTERM) == -1){
822
perror_plus("kill");
823
}
824
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
825
perror_plus("Failed to lower privileges after killing"
826
" helper program");
827
}
828
return false;
829
}
830
} while(pret == -1 and errno == EINTR);
831
if(pret == -1){
832
perror_plus("waitpid");
833
return false;
834
}
835
if(WIFEXITED(status)){
836
if(WEXITSTATUS(status) != 0){
837
fprintf_plus(stderr, "Error: iprouteadddel exited"
838
" with status %d\n", WEXITSTATUS(status));
839
return false;
840
}
841
return true;
842
}
843
if(WIFSIGNALED(status)){
844
fprintf_plus(stderr, "Error: iprouteadddel died by"
845
" signal %d\n", WTERMSIG(status));
846
return false;
847
}
848
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
849
return false;
850
}
851
852
__attribute__((nonnull, warn_unused_result))
853
static bool add_local_route(const char *address,
854
AvahiIfIndex if_index){
855
if(debug){
856
fprintf_plus(stderr, "Adding route to %s\n", address);
857
}
858
return add_delete_local_route(true, address, if_index);
859
}
860
861
__attribute__((nonnull, warn_unused_result))
862
static bool delete_local_route(const char *address,
863
AvahiIfIndex if_index){
864
if(debug){
865
fprintf_plus(stderr, "Removing route to %s\n", address);
866
}
867
return add_delete_local_route(false, address, if_index);
868
}
869
870
623
/* Called when a Mandos server is found */
871
__attribute__((nonnull, warn_unused_result))
872
624
static int start_mandos_communication(const char *ip, in_port_t port,
873
625
AvahiIfIndex if_index,
874
626
int af, mandos_context *mc){
875
627
int ret, tcp_sd = -1;
876
628
ssize_t sret;
877
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
878
633
char *buffer = NULL;
879
634
char *decrypted_buffer = NULL;
880
635
size_t buffer_length = 0;
883
638
int retval = -1;
884
639
gnutls_session_t session;
885
640
int pf; /* Protocol family */
886
bool route_added = false;
887
641
888
642
errno = 0;
889
643
947
701
PRIuMAX "\n", ip, (uintmax_t)port);
948
702
}
949
703
950
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
951
705
if(tcp_sd < 0){
952
706
int e = errno;
953
707
perror_plus("socket");
962
716
963
717
memset(&to, 0, sizeof(to));
964
718
if(af == AF_INET6){
965
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
966
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);
967
721
} else { /* IPv4 */
968
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
969
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);
970
724
}
971
725
if(ret < 0 ){
972
726
int e = errno;
981
735
goto mandos_end;
982
736
}
983
737
if(af == AF_INET6){
984
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
985
if(IN6_IS_ADDR_LINKLOCAL
986
(&((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
987
748
if(if_index == AVAHI_IF_UNSPEC){
988
749
fprintf_plus(stderr, "An IPv6 link-local address is"
989
750
" incomplete without a network interface\n");
991
752
goto mandos_end;
992
753
}
993
754
/* Set the network interface number as scope */
994
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
755
to.in6.sin6_scope_id = (uint32_t)if_index;
995
756
}
996
757
} else {
997
((struct sockaddr_in *)&to)->sin_port = htons(port);
758
to.in.sin_port = htons(port);
998
759
}
999
760
1000
761
if(quit_now){
1017
778
}
1018
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1019
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1020
if(af == AF_INET6){
1021
ret = getnameinfo((struct sockaddr *)&to,
1022
sizeof(struct sockaddr_in6),
1023
addrstr, sizeof(addrstr), NULL, 0,
1024
NI_NUMERICHOST);
1025
} else {
1026
ret = getnameinfo((struct sockaddr *)&to,
1027
sizeof(struct sockaddr_in),
1028
addrstr, sizeof(addrstr), NULL, 0,
1029
NI_NUMERICHOST);
1030
}
1031
if(ret == EAI_SYSTEM){
1032
perror_plus("getnameinfo");
1033
} else if(ret != 0) {
1034
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1035
} else if(strcmp(addrstr, ip) != 0){
1036
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1037
}
1038
}
1039
1040
if(quit_now){
1041
errno = EINTR;
1042
goto mandos_end;
1043
}
1044
1045
while(true){
1046
if(af == AF_INET6){
1047
ret = connect(tcp_sd, (struct sockaddr *)&to,
1048
sizeof(struct sockaddr_in6));
1049
} else {
1050
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1051
sizeof(struct sockaddr_in));
1052
}
1053
if(ret < 0){
1054
if(errno == ENETUNREACH
1055
and if_index != AVAHI_IF_UNSPEC
1056
and connect_to == NULL
1057
and not route_added and
1058
((af == AF_INET6 and not
1059
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1060
&to)->sin6_addr)))
1061
or (af == AF_INET and
1062
/* Not a a IPv4LL address */
1063
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1064
& 0xFFFF0000L) != 0xA9FE0000L))){
1065
/* Work around Avahi bug - Avahi does not announce link-local
1066
addresses if it has a global address, so local hosts with
1067
*only* a link-local address (e.g. Mandos clients) cannot
1068
connect to a Mandos server announced by Avahi on a server
1069
host with a global address. Work around this by retrying
1070
with an explicit route added with the server's address.
1071
1072
Avahi bug reference:
1073
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1074
https://bugs.debian.org/587961
1075
*/
1076
if(debug){
1077
fprintf_plus(stderr, "Mandos server unreachable, trying"
1078
" direct route\n");
1079
}
1080
int e = errno;
1081
route_added = add_local_route(ip, if_index);
1082
if(route_added){
1083
continue;
1084
}
1085
errno = e;
1086
}
1087
if(errno != ECONNREFUSED or debug){
1088
int e = errno;
1089
perror_plus("connect");
1090
errno = e;
1091
}
1092
goto mandos_end;
1093
}
1094
1095
if(quit_now){
1096
errno = EINTR;
1097
goto mandos_end;
1098
}
1099
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;
1100
820
}
1101
821
1102
822
const char *out = mandos_protocol_version;
1285
1005
1286
1006
mandos_end:
1287
1007
{
1288
if(route_added){
1289
if(not delete_local_route(ip, if_index)){
1290
fprintf_plus(stderr, "Failed to delete local route to %s on"
1291
" interface %d", ip, if_index);
1292
}
1293
}
1294
1008
int e = errno;
1295
1009
free(decrypted_buffer);
1296
1010
free(buffer);
1313
1027
return retval;
1314
1028
}
1315
1029
1316
__attribute__((nonnull))
1317
1030
static void resolve_callback(AvahiSServiceResolver *r,
1318
1031
AvahiIfIndex interface,
1319
1032
AvahiProtocol proto,
1327
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
1328
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1329
1042
flags,
1330
void *mc){
1043
void* mc){
1331
1044
if(r == NULL){
1332
1045
return;
1333
1046
}
1336
1049
timed out */
1337
1050
1338
1051
if(quit_now){
1339
avahi_s_service_resolver_free(r);
1340
1052
return;
1341
1053
}
1342
1054
1387
1099
const char *domain,
1388
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1389
1101
flags,
1390
void *mc){
1102
void* mc){
1391
1103
if(b == NULL){
1392
1104
return;
1393
1105
}
1453
1165
errno = old_errno;
1454
1166
}
1455
1167
1456
__attribute__((nonnull, warn_unused_result))
1457
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1458
1169
int ret;
1459
1170
error_t ret_errno;
1478
1189
return true;
1479
1190
}
1480
1191
1481
__attribute__((nonnull, warn_unused_result))
1482
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1483
1193
1484
1194
/* Reject the loopback device */
1526
1236
* corresponds to an acceptable network device.
1527
1237
* (This function is passed to scandir(3) as a filter function.)
1528
1238
*/
1529
__attribute__((nonnull, warn_unused_result))
1530
1239
int good_interface(const struct dirent *if_entry){
1531
1240
if(if_entry->d_name[0] == '.'){
1532
1241
return 0;
1550
1259
/*
1551
1260
* This function determines if a network interface is up.
1552
1261
*/
1553
__attribute__((nonnull, warn_unused_result))
1554
1262
bool interface_is_up(const char *interface){
1555
1263
struct ifreq ifr;
1556
1264
if(not get_flags(interface, &ifr)){
1567
1275
/*
1568
1276
* This function determines if a network interface is running
1569
1277
*/
1570
__attribute__((nonnull, warn_unused_result))
1571
1278
bool interface_is_running(const char *interface){
1572
1279
struct ifreq ifr;
1573
1280
if(not get_flags(interface, &ifr)){
1581
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1582
1289
}
1583
1290
1584
__attribute__((nonnull, pure, warn_unused_result))
1585
1291
int notdotentries(const struct dirent *direntry){
1586
1292
/* Skip "." and ".." */
1587
1293
if(direntry->d_name[0] == '.'
1594
1300
}
1595
1301
1596
1302
/* Is this directory entry a runnable program? */
1597
__attribute__((nonnull, warn_unused_result))
1598
1303
int runnable_hook(const struct dirent *direntry){
1599
1304
int ret;
1600
1305
size_t sret;
1608
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1609
1314
"abcdefghijklmnopqrstuvwxyz"
1610
1315
"0123456789"
1611
"_.-");
1316
"_-");
1612
1317
if((direntry->d_name)[sret] != '\0'){
1613
1318
/* Contains non-allowed characters */
1614
1319
if(debug){
1618
1323
return 0;
1619
1324
}
1620
1325
1621
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);
1622
1334
if(ret == -1){
1623
1335
if(debug){
1624
1336
perror_plus("Could not stat hook");
1648
1360
return 1;
1649
1361
}
1650
1362
1651
__attribute__((nonnull, warn_unused_result))
1652
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1653
1364
mandos_context *mc){
1654
1365
int ret;
1658
1369
1659
1370
while(true){
1660
1371
if(mc->current_server == NULL){
1661
if(debug){
1372
if (debug){
1662
1373
fprintf_plus(stderr, "Wait until first server is found."
1663
1374
" No timeout!\n");
1664
1375
}
1665
1376
ret = avahi_simple_poll_iterate(s, -1);
1666
1377
} else {
1667
if(debug){
1378
if (debug){
1668
1379
fprintf_plus(stderr, "Check current_server if we should run"
1669
1380
" it, or wait\n");
1670
1381
}
1687
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1688
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1689
1400
1690
if(debug){
1401
if (debug){
1691
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1692
1403
block_time);
1693
1404
}
1715
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1716
1427
}
1717
1428
if(ret != 0){
1718
if(ret > 0 or errno != EINTR){
1429
if (ret > 0 or errno != EINTR){
1719
1430
return (ret != 1) ? ret : 0;
1720
1431
}
1721
1432
}
1722
1433
}
1723
1434
}
1724
1435
1725
__attribute__((nonnull))
1726
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,
1727
1489
const float delay){
1728
struct dirent **direntries = NULL;
1729
if(hookdir_fd == -1){
1730
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1731
| O_CLOEXEC);
1732
if(hookdir_fd == -1){
1733
if(errno == ENOENT){
1734
if(debug){
1735
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1736
" found\n", hookdir);
1737
}
1738
} else {
1739
perror_plus("open");
1740
}
1741
return;
1742
}
1743
}
1744
#ifdef __GLIBC__
1745
#if __GLIBC_PREREQ(2, 15)
1746
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1747
runnable_hook, alphasort);
1748
#else /* not __GLIBC_PREREQ(2, 15) */
1749
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1750
alphasort);
1751
#endif /* not __GLIBC_PREREQ(2, 15) */
1752
#else /* not __GLIBC__ */
1753
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1754
alphasort);
1755
#endif /* not __GLIBC__ */
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1756
1495
if(numhooks == -1){
1757
perror_plus("scandir");
1758
return;
1759
}
1760
struct dirent *direntry;
1761
int ret;
1762
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1763
if(devnull == -1){
1764
perror_plus("open(\"/dev/null\", O_RDONLY)");
1765
return;
1766
}
1767
for(int i = 0; i < numhooks; i++){
1768
direntry = direntries[i];
1769
if(debug){
1770
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1771
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");
1772
1503
}
1773
pid_t hook_pid = fork();
1774
if(hook_pid == 0){
1775
/* Child */
1776
/* Raise privileges */
1777
errno = raise_privileges_permanently();
1778
if(errno != 0){
1779
perror_plus("Failed to raise privileges");
1780
_exit(EX_NOPERM);
1781
}
1782
/* Set group */
1783
errno = 0;
1784
ret = setgid(0);
1785
if(ret == -1){
1786
perror_plus("setgid");
1787
_exit(EX_NOPERM);
1788
}
1789
/* Reset supplementary groups */
1790
errno = 0;
1791
ret = setgroups(0, NULL);
1792
if(ret == -1){
1793
perror_plus("setgroups");
1794
_exit(EX_NOPERM);
1795
}
1796
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1797
if(ret == -1){
1798
perror_plus("setenv");
1799
_exit(EX_OSERR);
1800
}
1801
ret = setenv("DEVICE", interface, 1);
1802
if(ret == -1){
1803
perror_plus("setenv");
1804
_exit(EX_OSERR);
1805
}
1806
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1807
if(ret == -1){
1808
perror_plus("setenv");
1809
_exit(EX_OSERR);
1810
}
1811
ret = setenv("MODE", mode, 1);
1812
if(ret == -1){
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
char *delaystring;
1817
ret = asprintf(&delaystring, "%f", (double)delay);
1818
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){
1819
1511
perror_plus("asprintf");
1820
_exit(EX_OSERR);
1821
}
1822
ret = setenv("DELAY", delaystring, 1);
1823
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
}
1824
1570
free(delaystring);
1825
perror_plus("setenv");
1826
_exit(EX_OSERR);
1827
}
1828
free(delaystring);
1829
if(connect_to != NULL){
1830
ret = setenv("CONNECT", connect_to, 1);
1831
if(ret == -1){
1832
perror_plus("setenv");
1833
_exit(EX_OSERR);
1834
}
1835
}
1836
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1837
direntry->d_name,
1838
O_RDONLY));
1839
if(hook_fd == -1){
1840
perror_plus("openat");
1841
_exit(EXIT_FAILURE);
1842
}
1843
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1844
perror_plus("close");
1845
_exit(EXIT_FAILURE);
1846
}
1847
ret = dup2(devnull, STDIN_FILENO);
1848
if(ret == -1){
1849
perror_plus("dup2(devnull, STDIN_FILENO)");
1850
_exit(EX_OSERR);
1851
}
1852
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1853
if(ret == -1){
1854
perror_plus("close");
1855
_exit(EX_OSERR);
1856
}
1857
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1858
if(ret == -1){
1859
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1860
_exit(EX_OSERR);
1861
}
1862
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1863
environ) == -1){
1864
perror_plus("fexecve");
1865
_exit(EXIT_FAILURE);
1866
}
1867
} else {
1868
if(hook_pid == -1){
1869
perror_plus("fork");
1870
free(direntry);
1871
continue;
1872
}
1873
int status;
1874
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1875
perror_plus("waitpid");
1876
free(direntry);
1877
continue;
1878
}
1879
if(WIFEXITED(status)){
1880
if(WEXITSTATUS(status) != 0){
1881
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1882
" with status %d\n", direntry->d_name,
1883
WEXITSTATUS(status));
1884
free(direntry);
1885
continue;
1886
}
1887
} else if(WIFSIGNALED(status)){
1888
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1889
" signal %d\n", direntry->d_name,
1890
WTERMSIG(status));
1891
free(direntry);
1892
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
}
1893
1582
} else {
1894
fprintf_plus(stderr, "Warning: network hook \"%s\""
1895
" crashed\n", direntry->d_name);
1896
free(direntry);
1897
continue;
1898
}
1899
}
1900
if(debug){
1901
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1902
direntry->d_name);
1903
}
1904
free(direntry);
1905
}
1906
free(direntries);
1907
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1908
perror_plus("close");
1909
} else {
1910
hookdir_fd = -1;
1911
}
1912
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;
1913
1619
}
1914
1620
1915
__attribute__((nonnull, warn_unused_result))
1916
1621
error_t bring_up_interface(const char *const interface,
1917
1622
const float delay){
1623
int sd = -1;
1918
1624
error_t old_errno = errno;
1919
int ret;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1920
1627
struct ifreq network;
1921
1628
unsigned int if_index = if_nametoindex(interface);
1922
1629
if(if_index == 0){
1931
1638
}
1932
1639
1933
1640
if(not interface_is_up(interface)){
1934
error_t ret_errno = 0, ioctl_errno = 0;
1935
if(not get_flags(interface, &network)){
1641
if(not get_flags(interface, &network) and debug){
1936
1642
ret_errno = errno;
1937
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1938
1644
"\"%s\"\n", interface);
1939
errno = old_errno;
1940
1645
return ret_errno;
1941
1646
}
1942
network.ifr_flags |= IFF_UP; /* set flag */
1647
network.ifr_flags |= IFF_UP;
1943
1648
1944
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1945
if(sd == -1){
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1946
1651
ret_errno = errno;
1947
1652
perror_plus("socket");
1948
1653
errno = old_errno;
1949
1654
return ret_errno;
1950
1655
}
1951
1656
1952
1657
if(quit_now){
1953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1954
if(ret == -1){
1955
perror_plus("close");
1956
}
1658
close(sd);
1957
1659
errno = old_errno;
1958
1660
return EINTR;
1959
1661
}
1963
1665
interface);
1964
1666
}
1965
1667
1966
/* Raise privileges */
1967
ret_errno = raise_privileges();
1968
if(ret_errno != 0){
1969
errno = ret_errno;
1970
perror_plus("Failed to raise privileges");
1971
}
1668
/* Raise priviliges */
1669
raise_privileges();
1972
1670
1973
1671
#ifdef __linux__
1974
int ret_linux;
1975
bool restore_loglevel = false;
1976
if(ret_errno == 0){
1977
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1978
messages about the network interface to mess up the prompt */
1979
ret_linux = klogctl(8, NULL, 5);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
} else {
1983
restore_loglevel = true;
1984
}
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");
1985
1679
}
1986
1680
#endif /* __linux__ */
1987
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1988
ioctl_errno = errno;
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1989
1683
#ifdef __linux__
1990
1684
if(restore_loglevel){
1991
1685
ret_linux = klogctl(7, NULL, 0);
1995
1689
}
1996
1690
#endif /* __linux__ */
1997
1691
1998
/* If raise_privileges() succeeded above */
1999
if(ret_errno == 0){
2000
/* Lower privileges */
2001
ret_errno = lower_privileges();
2002
if(ret_errno != 0){
2003
errno = ret_errno;
2004
perror_plus("Failed to lower privileges");
2005
}
2006
}
1692
/* Lower privileges */
1693
lower_privileges();
2007
1694
2008
1695
/* Close the socket */
2009
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2012
1699
}
2013
1700
2014
1701
if(ret_setflags == -1){
2015
errno = ioctl_errno;
1702
errno = ret_errno;
2016
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2017
1704
errno = old_errno;
2018
return ioctl_errno;
1705
return ret_errno;
2019
1706
}
2020
1707
} else if(debug){
2021
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2039
1726
return 0;
2040
1727
}
2041
1728
2042
__attribute__((nonnull, warn_unused_result))
2043
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
2044
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
2045
1734
struct ifreq network;
2046
1735
unsigned int if_index = if_nametoindex(interface);
2047
1736
if(if_index == 0){
2050
1739
return ENXIO;
2051
1740
}
2052
1741
if(interface_is_up(interface)){
2053
error_t ret_errno = 0, ioctl_errno = 0;
2054
1742
if(not get_flags(interface, &network) and debug){
2055
1743
ret_errno = errno;
2056
1744
fprintf_plus(stderr, "Failed to get flags for interface "
2057
1745
"\"%s\"\n", interface);
2058
errno = old_errno;
2059
1746
return ret_errno;
2060
1747
}
2061
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2062
1749
2063
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2064
if(sd == -1){
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
2065
1752
ret_errno = errno;
2066
1753
perror_plus("socket");
2067
1754
errno = old_errno;
2073
1760
interface);
2074
1761
}
2075
1762
2076
/* Raise privileges */
2077
ret_errno = raise_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to raise privileges");
2081
}
2082
2083
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2084
ioctl_errno = errno;
2085
2086
/* If raise_privileges() succeeded above */
2087
if(ret_errno == 0){
2088
/* Lower privileges */
2089
ret_errno = lower_privileges();
2090
if(ret_errno != 0){
2091
errno = ret_errno;
2092
perror_plus("Failed to lower privileges");
2093
}
2094
}
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();
2095
1771
2096
1772
/* Close the socket */
2097
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2098
1774
if(ret == -1){
2099
1775
perror_plus("close");
2100
1776
}
2101
1777
2102
1778
if(ret_setflags == -1){
2103
errno = ioctl_errno;
1779
errno = ret_errno;
2104
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2105
1781
errno = old_errno;
2106
return ioctl_errno;
1782
return ret_errno;
2107
1783
}
2108
1784
} else if(debug){
2109
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2117
1793
int main(int argc, char *argv[]){
2118
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2119
1795
.priority = "SECURE256:!CTYPE-X.509:"
2120
"+CTYPE-OPENPGP", .current_server = NULL,
1796
"+CTYPE-OPENPGP", .current_server = NULL,
2121
1797
.interfaces = NULL, .interfaces_size = 0 };
2122
1798
AvahiSServiceBrowser *sb = NULL;
2123
1799
error_t ret_errno;
2127
1803
int exitcode = EXIT_SUCCESS;
2128
1804
char *interfaces_to_take_down = NULL;
2129
1805
size_t interfaces_to_take_down_size = 0;
2130
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2131
char old_tempdir[] = "/tmp/mandosXXXXXX";
2132
char *tempdir = NULL;
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1807
bool tempdir_created = false;
2133
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2134
1809
const char *seckey = PATHDIR "/" SECKEY;
2135
1810
const char *pubkey = PATHDIR "/" PUBKEY;
2136
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
2137
1813
2138
1814
bool gnutls_initialized = false;
2139
1815
bool gpgme_initialized = false;
2312
1988
goto end;
2313
1989
}
2314
1990
}
2315
1991
2316
1992
{
2317
1993
/* Work around Debian bug #633582:
2318
1994
<http://bugs.debian.org/633582> */
2319
1995
2320
/* Re-raise privileges */
2321
ret_errno = raise_privileges();
2322
if(ret_errno != 0){
2323
errno = ret_errno;
2324
perror_plus("Failed to raise privileges");
2325
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2326
1998
struct stat st;
2327
1999
2328
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2345
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2346
2018
}
2347
2019
}
2348
2020
2349
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2350
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2351
2023
if(pubkey_fd == -1){
2366
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2367
2039
}
2368
2040
}
2369
2041
2370
2042
/* Lower privileges */
2371
ret_errno = lower_privileges();
2372
if(ret_errno != 0){
2373
errno = ret_errno;
2374
perror_plus("Failed to lower privileges");
2375
}
2043
lower_privileges();
2376
2044
}
2377
2045
}
2378
2046
2402
2070
goto end;
2403
2071
}
2404
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2405
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2406
}
2407
run_network_hooks("start", interfaces_hooks != NULL ?
2408
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
}
2409
2081
}
2410
2082
2411
2083
if(not debug){
2489
2161
2490
2162
/* If no interfaces were specified, make a list */
2491
2163
if(mc.interfaces == NULL){
2492
struct dirent **direntries = NULL;
2164
struct dirent **direntries;
2493
2165
/* Look for any good interfaces */
2494
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2495
2167
alphasort);
2499
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2500
2172
direntries[i]->d_name);
2501
2173
if(ret_errno != 0){
2502
errno = ret_errno;
2503
2174
perror_plus("argz_add");
2504
free(direntries[i]);
2505
2175
continue;
2506
2176
}
2507
2177
if(debug){
2508
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2509
2179
direntries[i]->d_name);
2510
2180
}
2511
free(direntries[i]);
2512
2181
}
2513
2182
free(direntries);
2514
2183
} else {
2515
if(ret == 0){
2516
free(direntries);
2517
}
2184
free(direntries);
2518
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2519
2186
exitcode = EXIT_FAILURE;
2520
2187
goto end;
2543
2210
break;
2544
2211
}
2545
2212
bool interface_was_up = interface_is_up(interface);
2546
errno = bring_up_interface(interface, delay);
2213
ret = bring_up_interface(interface, delay);
2547
2214
if(not interface_was_up){
2548
if(errno != 0){
2215
if(ret != 0){
2216
errno = ret;
2549
2217
perror_plus("Failed to bring up interface");
2550
2218
} else {
2551
errno = argz_add(&interfaces_to_take_down,
2552
&interfaces_to_take_down_size,
2553
interface);
2554
if(errno != 0){
2555
perror_plus("argz_add");
2556
}
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2557
2222
}
2558
2223
}
2559
2224
}
2588
2253
goto end;
2589
2254
}
2590
2255
2591
/* Try /run/tmp before /tmp */
2592
tempdir = mkdtemp(run_tempdir);
2593
if(tempdir == NULL and errno == ENOENT){
2594
if(debug){
2595
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2596
run_tempdir, old_tempdir);
2597
}
2598
tempdir = mkdtemp(old_tempdir);
2599
}
2600
if(tempdir == NULL){
2256
if(mkdtemp(tempdir) == NULL){
2601
2257
perror_plus("mkdtemp");
2602
2258
goto end;
2603
2259
}
2260
tempdir_created = true;
2604
2261
2605
2262
if(quit_now){
2606
2263
goto end;
2681
2338
sleep((unsigned int)retry_interval);
2682
2339
}
2683
2340
2684
if(not quit_now){
2341
if (not quit_now){
2685
2342
exitcode = EXIT_SUCCESS;
2686
2343
}
2687
2344
2742
2399
if(debug){
2743
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2744
2401
}
2745
2402
2746
2403
ret = avahi_loop_with_timeout(simple_poll,
2747
2404
(int)(retry_interval * 1000), &mc);
2748
2405
if(debug){
2784
2441
mc.current_server->prev->next = NULL;
2785
2442
while(mc.current_server != NULL){
2786
2443
server *next = mc.current_server->next;
2787
#ifdef __GNUC__
2788
#pragma GCC diagnostic push
2789
#pragma GCC diagnostic ignored "-Wcast-qual"
2790
#endif
2791
free((char *)(mc.current_server->ip));
2792
#ifdef __GNUC__
2793
#pragma GCC diagnostic pop
2794
#endif
2795
2444
free(mc.current_server);
2796
2445
mc.current_server = next;
2797
2446
}
2798
2447
}
2799
2448
2800
/* Re-raise privileges */
2449
/* Re-raise priviliges */
2801
2450
{
2802
ret_errno = raise_privileges();
2803
if(ret_errno != 0){
2804
errno = ret_errno;
2805
perror_plus("Failed to raise privileges");
2806
} else {
2807
2808
/* Run network hooks */
2809
run_network_hooks("stop", interfaces_hooks != NULL ?
2810
interfaces_hooks : "", delay);
2811
2812
/* Take down the network interfaces which were brought up */
2813
{
2814
char *interface = NULL;
2815
while((interface=argz_next(interfaces_to_take_down,
2816
interfaces_to_take_down_size,
2817
interface))){
2818
ret_errno = take_down_interface(interface);
2819
if(ret_errno != 0){
2820
errno = ret_errno;
2821
perror_plus("Failed to take down interface");
2822
}
2823
}
2824
if(debug and (interfaces_to_take_down == NULL)){
2825
fprintf_plus(stderr, "No interfaces needed to be taken"
2826
" down\n");
2827
}
2828
}
2829
}
2830
2831
ret_errno = lower_privileges_permanently();
2832
if(ret_errno != 0){
2833
errno = ret_errno;
2834
perror_plus("Failed to lower privileges permanently");
2835
}
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();
2836
2476
}
2837
2477
2838
2478
free(interfaces_to_take_down);
2839
2479
free(interfaces_hooks);
2840
2480
2841
2481
/* Removes the GPGME temp directory and all files inside */
2842
if(tempdir != NULL){
2482
if(tempdir_created){
2843
2483
struct dirent **direntries = NULL;
2844
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2845
| O_NOFOLLOW
2846
| O_DIRECTORY
2847
| O_PATH));
2848
if(tempdir_fd == -1){
2849
perror_plus("open");
2850
} else {
2851
#ifdef __GLIBC__
2852
#if __GLIBC_PREREQ(2, 15)
2853
int numentries = scandirat(tempdir_fd, ".", &direntries,
2854
notdotentries, alphasort);
2855
#else /* not __GLIBC_PREREQ(2, 15) */
2856
int numentries = scandir(tempdir, &direntries, notdotentries,
2857
alphasort);
2858
#endif /* not __GLIBC_PREREQ(2, 15) */
2859
#else /* not __GLIBC__ */
2860
int numentries = scandir(tempdir, &direntries, notdotentries,
2861
alphasort);
2862
#endif /* not __GLIBC__ */
2863
if(numentries >= 0){
2864
for(int i = 0; i < numentries; i++){
2865
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2866
if(ret == -1){
2867
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2868
" \"%s\", 0): %s\n", tempdir,
2869
direntries[i]->d_name, strerror(errno));
2870
}
2871
free(direntries[i]);
2872
}
2873
2874
/* need to clean even if 0 because man page doesn't specify */
2875
free(direntries);
2876
if(numentries == -1){
2877
perror_plus("scandir");
2878
}
2879
ret = rmdir(tempdir);
2880
if(ret == -1 and errno != ENOENT){
2881
perror_plus("rmdir");
2882
}
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);
2883
2503
}
2884
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");
2885
2514
}
2886
2515
}
2887
2516
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0