To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 535.1.8
- compare with another revision
- download diff
- download tarball
- view history from revision 535.1.8
- Committer: teddy at recompile
- Date: 2011-12-31 13:25:58 UTC
- mto: This revision was merged to the branch mainline in revision 541.
- Revision ID: teddy@recompile.se-20111231132558-z0dh7qgofgctmgri
* network-hooks.s/bridge: Don't use interface names directly; search
for interface names using their address.
(addrtoif): New function.
* network-hooks.s/bridge.conf (PORTS): Removed.
(PORT_ADDRESSES): New.
* network-hooks.s/wireless: Don't use interface names directly; search
for interface names using their address.
(addrtoif): New function.
* network-hooks.s/wireless.conf: Specify address.
for interface names using their address.
(addrtoif): New function.
* network-hooks.s/bridge.conf (PORTS): Removed.
(PORT_ADDRESSES): New.
* network-hooks.s/wireless: Don't use interface names directly; search
for interface names using their address.
(addrtoif): New function.
* network-hooks.s/wireless.conf: Specify address.
- files removed:
- debian/mandos-client.examples
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
87
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
89
WEXITSTATUS(), WTERMSIG() */
89
90
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
91
95
92
#ifdef __linux__
96
93
#include <sys/klog.h> /* klogctl() */
138
135
static const char sys_class_net[] = "/sys/class/net";
139
136
char *connect_to = NULL;
140
137
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
138
144
139
/* Doubly linked list that need to be circularly linked when used */
145
140
typedef struct server{
146
141
const char *ip;
147
in_port_t port;
142
uint16_t port;
148
143
AvahiIfIndex if_index;
149
144
int af;
150
145
struct timespec last_seen;
154
149
155
150
/* Used for passing in values through the Avahi callback functions */
156
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
157
153
AvahiServer *server;
158
154
gnutls_certificate_credentials_t cred;
159
155
unsigned int dh_bits;
161
157
const char *priority;
162
158
gpgme_ctx_t ctx;
163
159
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
160
} mandos_context;
167
161
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
170
167
171
168
sig_atomic_t quit_now = 0;
172
169
int signal_received = 0;
187
184
188
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
186
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
188
}
192
189
193
190
/*
198
195
size_t incbuffer(char **buffer, size_t buffer_length,
199
196
size_t buffer_capacity){
200
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(new_buf == NULL){
203
int old_errno = errno;
204
free(*buffer);
205
errno = old_errno;
206
*buffer = NULL;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
207
200
return 0;
208
201
}
209
*buffer = new_buf;
210
202
buffer_capacity += BUFFER_SIZE;
211
203
}
212
204
return buffer_capacity;
213
205
}
214
206
215
207
/* Add server to set of servers to retry periodically */
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
218
210
int ret;
219
211
server *new_server = malloc(sizeof(server));
220
212
if(new_server == NULL){
230
222
return false;
231
223
}
232
224
/* Special case of first server */
233
if(*current_server == NULL){
225
if (mc.current_server == NULL){
234
226
new_server->next = new_server;
235
227
new_server->prev = new_server;
236
*current_server = new_server;
228
mc.current_server = new_server;
237
229
/* Place the new server last in the list */
238
230
} else {
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
241
233
new_server->prev->next = new_server;
242
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
243
235
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
245
237
if(ret == -1){
246
238
perror_plus("clock_gettime");
247
239
return false;
253
245
* Initialize GPGME.
254
246
*/
255
247
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
248
const char *tempdir){
257
249
gpgme_error_t rc;
258
250
gpgme_engine_info_t engine_info;
259
251
252
260
253
/*
261
254
* Helper function to insert pub and seckey to the engine keyring.
262
255
*/
278
271
return false;
279
272
}
280
273
281
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
282
275
if(rc != GPG_ERR_NO_ERROR){
283
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
277
gpgme_strsource(rc), gpgme_strerror(rc));
328
321
}
329
322
330
323
/* Create new GPGME "context" */
331
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
332
325
if(rc != GPG_ERR_NO_ERROR){
333
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
349
342
*/
350
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
351
344
size_t crypto_size,
352
char **plaintext,
353
mandos_context *mc){
345
char **plaintext){
354
346
gpgme_data_t dh_crypto, dh_plain;
355
347
gpgme_error_t rc;
356
348
ssize_t ret;
382
374
383
375
/* Decrypt data from the cryptotext data buffer to the plaintext
384
376
data buffer */
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
386
378
if(rc != GPG_ERR_NO_ERROR){
387
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
380
gpgme_strsource(rc), gpgme_strerror(rc));
389
381
plaintext_length = -1;
390
382
if(debug){
391
383
gpgme_decrypt_result_t result;
392
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
393
385
if(result == NULL){
394
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
395
387
} else {
473
465
}
474
466
475
467
static const char * safer_gnutls_strerror(int value){
476
const char *ret = gnutls_strerror(value);
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
477
470
if(ret == NULL)
478
471
ret = "(unknown)";
479
472
return ret;
486
479
}
487
480
488
481
static int init_gnutls_global(const char *pubkeyfilename,
489
const char *seckeyfilename,
490
mandos_context *mc){
482
const char *seckeyfilename){
491
483
int ret;
492
484
493
485
if(debug){
510
502
}
511
503
512
504
/* OpenPGP credentials */
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
514
506
if(ret != GNUTLS_E_SUCCESS){
515
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
508
safer_gnutls_strerror(ret));
526
518
}
527
519
528
520
ret = gnutls_certificate_set_openpgp_key_file
529
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
530
522
GNUTLS_OPENPGP_FMT_BASE64);
531
523
if(ret != GNUTLS_E_SUCCESS){
532
524
fprintf_plus(stderr,
538
530
}
539
531
540
532
/* GnuTLS server initialization */
541
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
542
534
if(ret != GNUTLS_E_SUCCESS){
543
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
536
" initialization: %s\n",
545
537
safer_gnutls_strerror(ret));
546
538
goto globalfail;
547
539
}
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
549
541
if(ret != GNUTLS_E_SUCCESS){
550
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
543
safer_gnutls_strerror(ret));
552
544
goto globalfail;
553
545
}
554
546
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
556
548
557
549
return 0;
558
550
559
551
globalfail:
560
552
561
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
562
554
gnutls_global_deinit();
563
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
564
556
return -1;
565
557
}
566
558
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
569
560
int ret;
570
561
/* GnuTLS session creation */
571
562
do {
583
574
{
584
575
const char *err;
585
576
do {
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
587
578
if(quit_now){
588
579
gnutls_deinit(*session);
589
580
return -1;
600
591
601
592
do {
602
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
603
mc->cred);
594
mc.cred);
604
595
if(quit_now){
605
596
gnutls_deinit(*session);
606
597
return -1;
616
607
/* ignore client certificate if any. */
617
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
609
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
620
611
621
612
return 0;
622
613
}
626
617
__attribute__((unused)) const char *txt){}
627
618
628
619
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
630
621
AvahiIfIndex if_index,
631
int af, mandos_context *mc){
622
int af){
632
623
int ret, tcp_sd = -1;
633
624
ssize_t sret;
634
625
union {
664
655
return -1;
665
656
}
666
657
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
658
ret = init_gnutls_session(&session);
700
659
if(ret != 0){
701
660
return -1;
702
661
}
703
662
704
663
if(debug){
705
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
707
666
}
708
667
709
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
740
699
goto mandos_end;
741
700
}
742
701
if(af == AF_INET6){
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
748
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
753
709
if(if_index == AVAHI_IF_UNSPEC){
754
710
fprintf_plus(stderr, "An IPv6 link-local address is"
755
711
" incomplete without a network interface\n");
760
716
to.in6.sin6_scope_id = (uint32_t)if_index;
761
717
}
762
718
} else {
763
to.in.sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
764
722
}
765
723
766
724
if(quit_now){
774
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
775
733
perror_plus("if_indextoname");
776
734
} else {
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
779
737
}
780
738
} else {
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
783
741
}
784
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
785
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
863
821
goto mandos_end;
864
822
}
865
823
866
/* This casting via intptr_t is to eliminate warning about casting
867
an int to a pointer type. This is exactly how the GnuTLS Guile
868
function "set-session-transport-fd!" does it. */
869
gnutls_transport_set_ptr(session,
870
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
871
826
872
827
if(quit_now){
873
828
errno = EINTR;
978
933
if(buffer_length > 0){
979
934
ssize_t decrypted_buffer_size;
980
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
981
&decrypted_buffer, mc);
936
&decrypted_buffer);
982
937
if(decrypted_buffer_size >= 0){
983
938
984
939
written = 0;
1045
1000
AVAHI_GCC_UNUSED AvahiStringList *txt,
1046
1001
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1047
1002
flags,
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1052
1005
1053
1006
/* Called whenever a service has been resolved successfully or
1054
1007
timed out */
1063
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1064
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1065
1018
domain,
1066
avahi_strerror(avahi_server_errno
1067
(((mandos_context*)mc)->server)));
1019
avahi_strerror(avahi_server_errno(mc.server)));
1068
1020
break;
1069
1021
1070
1022
case AVAHI_RESOLVER_FOUND:
1076
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1077
1029
host_name, ip, (intmax_t)interface, port);
1078
1030
}
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1083
1033
if(ret == 0){
1084
avahi_simple_poll_quit(simple_poll);
1034
avahi_simple_poll_quit(mc.simple_poll);
1085
1035
} else {
1086
if(not add_server(ip, (in_port_t)port, interface,
1087
avahi_proto_to_af(proto),
1088
&((mandos_context*)mc)->current_server)){
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1089
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1090
1039
" list\n", name);
1091
1040
}
1104
1053
const char *domain,
1105
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1106
1055
flags,
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1111
1058
1112
1059
/* Called whenever a new services becomes available on the LAN or
1113
1060
is removed from the LAN */
1121
1068
case AVAHI_BROWSER_FAILURE:
1122
1069
1123
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1124
avahi_strerror(avahi_server_errno
1125
(((mandos_context*)mc)->server)));
1126
avahi_simple_poll_quit(simple_poll);
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1127
1073
return;
1128
1074
1129
1075
case AVAHI_BROWSER_NEW:
1132
1078
the callback function is called the Avahi server will free the
1133
1079
resolver for us. */
1134
1080
1135
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1136
interface, protocol, name, type,
1137
domain, protocol, 0,
1138
resolve_callback, mc) == NULL)
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1139
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1140
1085
" %s\n", name,
1141
avahi_strerror(avahi_server_errno
1142
(((mandos_context*)mc)->server)));
1086
avahi_strerror(avahi_server_errno(mc.server)));
1143
1087
break;
1144
1088
1145
1089
case AVAHI_BROWSER_REMOVE:
1164
1108
signal_received = sig;
1165
1109
int old_errno = errno;
1166
1110
/* set main loop to exit */
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1169
1113
}
1170
1114
errno = old_errno;
1171
1115
}
1172
1116
1173
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1174
1118
int ret;
1175
error_t ret_errno;
1176
1119
1177
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1178
1121
if(s < 0){
1179
ret_errno = errno;
1180
1122
perror_plus("socket");
1181
errno = ret_errno;
1182
1123
return false;
1183
1124
}
1184
1125
strcpy(ifr->ifr_name, ifname);
1185
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1186
1127
if(ret == -1){
1187
1128
if(debug){
1188
ret_errno = errno;
1189
1129
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1191
1130
}
1192
1131
return false;
1193
1132
}
1262
1201
}
1263
1202
1264
1203
/*
1265
* This function determines if a network interface is up.
1266
*/
1267
bool interface_is_up(const char *interface){
1268
struct ifreq ifr;
1269
if(not get_flags(interface, &ifr)){
1270
if(debug){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1273
}
1274
return false;
1275
}
1276
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1278
}
1279
1280
/*
1281
* This function determines if a network interface is running
1282
*/
1283
bool interface_is_running(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1294
1244
}
1295
1245
1296
1246
int notdotentries(const struct dirent *direntry){
1365
1315
return 1;
1366
1316
}
1367
1317
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1370
1319
int ret;
1371
1320
struct timespec now;
1372
1321
struct timespec waited_time;
1373
1322
intmax_t block_time;
1374
1323
1375
1324
while(true){
1376
if(mc->current_server == NULL){
1325
if(mc.current_server == NULL){
1377
1326
if (debug){
1378
1327
fprintf_plus(stderr, "Wait until first server is found."
1379
1328
" No timeout!\n");
1393
1342
/* Calculating in ms how long time between now and server
1394
1343
who we visted longest time ago. Now - last seen. */
1395
1344
waited_time.tv_sec = (now.tv_sec
1396
- mc->current_server->last_seen.tv_sec);
1345
- mc.current_server->last_seen.tv_sec);
1397
1346
waited_time.tv_nsec = (now.tv_nsec
1398
- mc->current_server->last_seen.tv_nsec);
1347
- mc.current_server->last_seen.tv_nsec);
1399
1348
/* total time is 10s/10,000ms.
1400
1349
Converting to s from ms by dividing by 1,000,
1401
1350
and ns to ms by dividing by 1,000,000. */
1409
1358
}
1410
1359
1411
1360
if(block_time <= 0){
1412
ret = start_mandos_communication(mc->current_server->ip,
1413
mc->current_server->port,
1414
mc->current_server->if_index,
1415
mc->current_server->af, mc);
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1416
1365
if(ret == 0){
1417
avahi_simple_poll_quit(s);
1366
avahi_simple_poll_quit(mc.simple_poll);
1418
1367
return 0;
1419
1368
}
1420
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1421
&mc->current_server->last_seen);
1370
&mc.current_server->last_seen);
1422
1371
if(ret == -1){
1423
1372
perror_plus("clock_gettime");
1424
1373
return -1;
1425
1374
}
1426
mc->current_server = mc->current_server->next;
1375
mc.current_server = mc.current_server->next;
1427
1376
block_time = 0; /* Call avahi to find new Mandos
1428
1377
servers, but don't block */
1429
1378
}
1438
1387
}
1439
1388
}
1440
1389
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1446
ret_errno = errno;
1447
perror_plus("seteuid");
1448
}
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1457
if(ret_errno != 0){
1458
errno = old_errno;
1459
return ret_errno;
1460
}
1461
if(setuid(0) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("seteuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1486
ret_errno = errno;
1487
perror_plus("setuid");
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
1390
bool run_network_hooks(const char *mode, const char *interface,
1494
1391
const float delay){
1495
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1496
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
1396
alphasort);
1498
1397
if(numhooks == -1){
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
1506
}
1398
perror_plus("scandir");
1507
1399
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
1400
int devnull = open("/dev/null", O_RDONLY);
1511
1401
for(int i = 0; i < numhooks; i++){
1512
1402
direntry = direntries[i];
1524
1414
if(hook_pid == 0){
1525
1415
/* Child */
1526
1416
/* Raise privileges */
1527
raise_privileges_permanently();
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1528
1428
/* Set group */
1529
1429
errno = 0;
1530
1430
ret = setgid(0);
1623
1523
return true;
1624
1524
}
1625
1525
1626
error_t bring_up_interface(const char *const interface,
1627
const float delay){
1628
int sd = -1;
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1634
if(if_index == 0){
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1636
errno = old_errno;
1637
return ENXIO;
1638
}
1639
1640
if(quit_now){
1641
errno = old_errno;
1642
return EINTR;
1643
}
1644
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1647
ret_errno = errno;
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1650
return ret_errno;
1651
}
1652
network.ifr_flags |= IFF_UP;
1653
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
1656
ret_errno = errno;
1657
perror_plus("socket");
1658
errno = old_errno;
1659
return ret_errno;
1660
}
1661
1662
if(quit_now){
1663
close(sd);
1664
errno = old_errno;
1665
return EINTR;
1666
}
1667
1668
if(debug){
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1670
interface);
1671
}
1672
1673
/* Raise priviliges */
1674
raise_privileges();
1675
1676
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1684
}
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
1688
#ifdef __linux__
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1693
}
1694
}
1695
#endif /* __linux__ */
1696
1697
/* Lower privileges */
1698
lower_privileges();
1699
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
1706
if(ret_setflags == -1){
1707
errno = ret_errno;
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
} else if(debug){
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
interface);
1715
}
1716
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1721
break;
1722
}
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1727
}
1728
}
1729
1730
errno = old_errno;
1731
return 0;
1732
}
1733
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1738
if(if_index == 0){
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1740
errno = old_errno;
1741
return ENXIO;
1742
}
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
return ret_errno;
1750
}
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
1755
ret_errno = errno;
1756
perror_plus("socket");
1757
errno = old_errno;
1758
return ret_errno;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise priviliges */
1767
raise_privileges();
1768
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
1771
1772
/* Lower privileges */
1773
lower_privileges();
1774
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ret_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
errno = old_errno;
1785
return ret_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1789
interface);
1790
}
1791
1792
errno = old_errno;
1793
return 0;
1794
}
1795
1796
1526
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
1801
1527
AvahiSServiceBrowser *sb = NULL;
1802
error_t ret_errno;
1528
int error;
1803
1529
int ret;
1804
1530
intmax_t tmpmax;
1805
1531
char *tmp;
1806
1532
int exitcode = EXIT_SUCCESS;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1809
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1810
1540
bool tempdir_created = false;
1811
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1812
1542
const char *seckey = PATHDIR "/" SECKEY;
1813
1543
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1815
1544
1816
1545
bool gnutls_initialized = false;
1817
1546
bool gpgme_initialized = false;
1908
1637
connect_to = arg;
1909
1638
break;
1910
1639
case 'i': /* --interface */
1911
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1912
arg, (int)',');
1913
if(ret_errno != 0){
1914
argp_error(state, "%s", strerror(ret_errno));
1915
}
1640
interface = arg;
1916
1641
break;
1917
1642
case 's': /* --seckey */
1918
1643
seckey = arg;
1996
1721
<http://bugs.debian.org/633582> */
1997
1722
1998
1723
/* Re-raise priviliges */
1999
if(raise_privileges() == 0){
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
2000
1729
struct stat st;
2001
1730
2002
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2042
1771
}
2043
1772
2044
1773
/* Lower privileges */
2045
lower_privileges();
2046
}
2047
}
2048
2049
/* Remove invalid interface names (except "none") */
2050
{
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2053
interface))){
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2059
}
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2061
interface = NULL;
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2062
1778
}
2063
1779
}
2064
1780
}
2065
1781
2066
1782
/* Run network hooks */
2067
{
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2072
goto end;
2073
}
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2081
1785
}
2082
1786
2083
1787
if(not debug){
2084
1788
avahi_set_log_function(empty_log);
2085
1789
}
2086
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
2087
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1824
from the signal handler */
2089
1825
/* Initialize the pseudo-RNG for Avahi */
2090
1826
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2093
1829
fprintf_plus(stderr,
2094
1830
"Avahi: Failed to create simple poll object.\n");
2095
1831
exitcode = EX_UNAVAILABLE;
2159
1895
}
2160
1896
}
2161
1897
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("argz_add");
2176
continue;
2177
}
2178
if(debug){
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
2181
}
2182
}
2183
free(direntries);
2184
} else {
2185
free(direntries);
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2188
goto end;
2189
}
2190
}
2191
2192
/* Bring up interfaces which are down, and remove any "none"s */
2193
{
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2196
interface))){
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2201
interface);
2202
interface = NULL;
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
interface);
2208
interface = NULL;
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2209
1983
}
2210
1984
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2211
2002
break;
2212
2003
}
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2218
perror_plus("Failed to bring up interface");
2219
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2225
perror_plus("argz_add");
2226
}
2227
}
2228
}
2229
}
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2232
}
2233
}
2234
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2237
if(debug){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2239
mc.interfaces);
2240
}
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2242
2033
}
2243
2034
2244
2035
if(quit_now){
2245
2036
goto end;
2246
2037
}
2247
2038
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2039
ret = init_gnutls_global(pubkey, seckey);
2249
2040
if(ret == -1){
2250
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2251
2042
exitcode = EX_UNAVAILABLE;
2268
2059
goto end;
2269
2060
}
2270
2061
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2272
2063
fprintf_plus(stderr, "init_gpgme failed\n");
2273
2064
exitcode = EX_UNAVAILABLE;
2274
2065
goto end;
2284
2075
/* Connect directly, do not use Zeroconf */
2285
2076
/* (Mainly meant for debugging) */
2286
2077
char *address = strrchr(connect_to, ':');
2287
2288
2078
if(address == NULL){
2289
2079
fprintf_plus(stderr, "No colon in address\n");
2290
2080
exitcode = EX_USAGE;
2295
2085
goto end;
2296
2086
}
2297
2087
2298
in_port_t port;
2088
uint16_t port;
2299
2089
errno = 0;
2300
2090
tmpmax = strtoimax(address+1, &tmp, 10);
2301
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2302
or tmpmax != (in_port_t)tmpmax){
2092
or tmpmax != (uint16_t)tmpmax){
2303
2093
fprintf_plus(stderr, "Bad port number\n");
2304
2094
exitcode = EX_USAGE;
2305
2095
goto end;
2306
2096
}
2307
2097
2308
2098
if(quit_now){
2309
2099
goto end;
2310
2100
}
2311
2101
2312
port = (in_port_t)tmpmax;
2102
port = (uint16_t)tmpmax;
2313
2103
*address = '\0';
2314
2104
/* Colon in address indicates IPv6 */
2315
2105
int af;
2331
2121
}
2332
2122
2333
2123
while(not quit_now){
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
2124
ret = start_mandos_communication(address, port, if_index, af);
2336
2125
if(quit_now or ret == 0){
2337
2126
break;
2338
2127
}
2340
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2341
2130
(int)retry_interval);
2342
2131
}
2343
sleep((unsigned int)retry_interval);
2132
sleep((int)retry_interval);
2344
2133
}
2345
2134
2346
2135
if (not quit_now){
2364
2153
config.publish_domain = 0;
2365
2154
2366
2155
/* Allocate a new server */
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2369
2159
2370
2160
/* Free the Avahi configuration data */
2371
2161
avahi_server_config_free(&config);
2374
2164
/* Check if creating the Avahi server object succeeded */
2375
2165
if(mc.server == NULL){
2376
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
2167
avahi_strerror(error));
2378
2168
exitcode = EX_UNAVAILABLE;
2379
2169
goto end;
2380
2170
}
2386
2176
/* Create the Avahi service browser */
2387
2177
sb = avahi_s_service_browser_new(mc.server, if_index,
2388
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
2179
NULL, 0, browse_callback, NULL);
2391
2180
if(sb == NULL){
2392
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2393
2182
avahi_strerror(avahi_server_errno(mc.server)));
2405
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2406
2195
}
2407
2196
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2410
2199
if(debug){
2411
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
2201
(ret == 0) ? "successfully" : "with error");
2419
2208
}
2420
2209
2421
2210
/* Cleanup things */
2422
free(mc.interfaces);
2423
2424
2211
if(sb != NULL)
2425
2212
avahi_s_service_browser_free(sb);
2426
2213
2427
2214
if(mc.server != NULL)
2428
2215
avahi_server_free(mc.server);
2429
2216
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2432
2219
2433
2220
if(gnutls_initialized){
2434
2221
gnutls_certificate_free_credentials(mc.cred);
2451
2238
}
2452
2239
}
2453
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2454
2244
/* Re-raise priviliges */
2455
2245
{
2456
raise_privileges();
2457
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2461
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2250
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2472
2262
}
2473
2263
}
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2477
2267
}
2478
2268
}
2479
2480
lower_privileges_permanently();
2481
}
2482
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2485
2276
2486
2277
/* Removes the GPGME temp directory and all files inside */
2487
2278
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0