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- Committer: Teddy Hogeborn
- Date: 2014-01-06 16:01:46 UTC
- Revision ID: teddy@recompile.se-20140106160146-v5gnpwf0vidfz7h7
Minor code fix; raise only exception instances, not classes.
* mandos (DBusObjectWithProperties.Set): Add error message if raising
ValueError (should never
happen anyway).
* mandos (DBusObjectWithProperties.Set): Add error message if raising
ValueError (should never
happen anyway).
- files added:
- debian/mandos-client.examples
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
88
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
88
WEXITSTATUS(), WTERMSIG() */
90
89
#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() */
91
94
92
95
#ifdef __linux__
93
96
#include <sys/klog.h> /* klogctl() */
135
138
static const char sys_class_net[] = "/sys/class/net";
136
139
char *connect_to = NULL;
137
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
138
143
139
144
/* Doubly linked list that need to be circularly linked when used */
140
145
typedef struct server{
141
146
const char *ip;
142
uint16_t port;
147
in_port_t port;
143
148
AvahiIfIndex if_index;
144
149
int af;
145
150
struct timespec last_seen;
149
154
150
155
/* Used for passing in values through the Avahi callback functions */
151
156
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
157
AvahiServer *server;
154
158
gnutls_certificate_credentials_t cred;
155
159
unsigned int dh_bits;
157
161
const char *priority;
158
162
gpgme_ctx_t ctx;
159
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
160
166
} mandos_context;
161
167
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 };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
167
170
168
171
sig_atomic_t quit_now = 0;
169
172
int signal_received = 0;
184
187
185
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
189
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
191
}
189
192
190
193
/*
205
208
}
206
209
207
210
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
210
213
int ret;
211
214
server *new_server = malloc(sizeof(server));
212
215
if(new_server == NULL){
222
225
return false;
223
226
}
224
227
/* Special case of first server */
225
if (mc.current_server == NULL){
228
if(*current_server == NULL){
226
229
new_server->next = new_server;
227
230
new_server->prev = new_server;
228
mc.current_server = new_server;
231
*current_server = new_server;
229
232
/* Place the new server last in the list */
230
233
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
233
236
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
237
(*current_server)->prev = new_server;
235
238
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
237
240
if(ret == -1){
238
241
perror_plus("clock_gettime");
239
242
return false;
245
248
* Initialize GPGME.
246
249
*/
247
250
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
251
const char *tempdir, mandos_context *mc){
249
252
gpgme_error_t rc;
250
253
gpgme_engine_info_t engine_info;
251
254
252
253
255
/*
254
256
* Helper function to insert pub and seckey to the engine keyring.
255
257
*/
271
273
return false;
272
274
}
273
275
274
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
275
277
if(rc != GPG_ERR_NO_ERROR){
276
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
279
gpgme_strsource(rc), gpgme_strerror(rc));
321
323
}
322
324
323
325
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
325
327
if(rc != GPG_ERR_NO_ERROR){
326
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
342
344
*/
343
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
346
size_t crypto_size,
345
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
346
349
gpgme_data_t dh_crypto, dh_plain;
347
350
gpgme_error_t rc;
348
351
ssize_t ret;
374
377
375
378
/* Decrypt data from the cryptotext data buffer to the plaintext
376
379
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
381
if(rc != GPG_ERR_NO_ERROR){
379
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
383
gpgme_strsource(rc), gpgme_strerror(rc));
381
384
plaintext_length = -1;
382
385
if(debug){
383
386
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
385
388
if(result == NULL){
386
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
390
} else {
465
468
}
466
469
467
470
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
470
472
if(ret == NULL)
471
473
ret = "(unknown)";
472
474
return ret;
479
481
}
480
482
481
483
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
483
486
int ret;
484
487
485
488
if(debug){
502
505
}
503
506
504
507
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
509
if(ret != GNUTLS_E_SUCCESS){
507
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
511
safer_gnutls_strerror(ret));
518
521
}
519
522
520
523
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
522
525
GNUTLS_OPENPGP_FMT_BASE64);
523
526
if(ret != GNUTLS_E_SUCCESS){
524
527
fprintf_plus(stderr,
530
533
}
531
534
532
535
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
534
537
if(ret != GNUTLS_E_SUCCESS){
535
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
539
" initialization: %s\n",
537
540
safer_gnutls_strerror(ret));
538
541
goto globalfail;
539
542
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
541
544
if(ret != GNUTLS_E_SUCCESS){
542
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
546
safer_gnutls_strerror(ret));
544
547
goto globalfail;
545
548
}
546
549
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
551
549
552
return 0;
550
553
551
554
globalfail:
552
555
553
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
554
557
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
556
559
return -1;
557
560
}
558
561
559
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
560
564
int ret;
561
565
/* GnuTLS session creation */
562
566
do {
574
578
{
575
579
const char *err;
576
580
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
582
if(quit_now){
579
583
gnutls_deinit(*session);
580
584
return -1;
591
595
592
596
do {
593
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
598
mc->cred);
595
599
if(quit_now){
596
600
gnutls_deinit(*session);
597
601
return -1;
607
611
/* ignore client certificate if any. */
608
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
613
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
611
615
612
616
return 0;
613
617
}
617
621
__attribute__((unused)) const char *txt){}
618
622
619
623
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
621
625
AvahiIfIndex if_index,
622
int af){
626
int af, mandos_context *mc){
623
627
int ret, tcp_sd = -1;
624
628
ssize_t sret;
625
629
union {
655
659
return -1;
656
660
}
657
661
658
ret = init_gnutls_session(&session);
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
659
695
if(ret != 0){
660
696
return -1;
661
697
}
662
698
663
699
if(debug){
664
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
701
PRIuMAX "\n", ip, (uintmax_t)port);
666
702
}
667
703
668
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
699
735
goto mandos_end;
700
736
}
701
737
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
706
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
709
748
if(if_index == AVAHI_IF_UNSPEC){
710
749
fprintf_plus(stderr, "An IPv6 link-local address is"
711
750
" incomplete without a network interface\n");
716
755
to.in6.sin6_scope_id = (uint32_t)if_index;
717
756
}
718
757
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
758
to.in.sin_port = htons(port);
722
759
}
723
760
724
761
if(quit_now){
732
769
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
770
perror_plus("if_indextoname");
734
771
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
737
774
}
738
775
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
741
778
}
742
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
936
973
if(buffer_length > 0){
937
974
ssize_t decrypted_buffer_size;
938
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
939
&decrypted_buffer);
976
&decrypted_buffer, mc);
940
977
if(decrypted_buffer_size >= 0){
941
978
942
979
written = 0;
1003
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
1004
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
1042
flags,
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
1008
1047
1009
1048
/* Called whenever a service has been resolved successfully or
1010
1049
timed out */
1019
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
1060
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
1023
1063
break;
1024
1064
1025
1065
case AVAHI_RESOLVER_FOUND:
1031
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
1072
host_name, ip, (intmax_t)interface, port);
1033
1073
}
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1036
1078
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1079
avahi_simple_poll_quit(simple_poll);
1038
1080
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1041
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
1085
" list\n", name);
1043
1086
}
1056
1099
const char *domain,
1057
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1101
flags,
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
1061
1106
1062
1107
/* Called whenever a new services becomes available on the LAN or
1063
1108
is removed from the LAN */
1071
1116
case AVAHI_BROWSER_FAILURE:
1072
1117
1073
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
1076
1122
return;
1077
1123
1078
1124
case AVAHI_BROWSER_NEW:
1081
1127
the callback function is called the Avahi server will free the
1082
1128
resolver for us. */
1083
1129
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1087
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
1135
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1090
1138
break;
1091
1139
1092
1140
case AVAHI_BROWSER_REMOVE:
1111
1159
signal_received = sig;
1112
1160
int old_errno = errno;
1113
1161
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1116
1164
}
1117
1165
errno = old_errno;
1118
1166
}
1119
1167
1120
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
1169
int ret;
1170
error_t ret_errno;
1122
1171
1123
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
1173
if(s < 0){
1174
ret_errno = errno;
1125
1175
perror_plus("socket");
1176
errno = ret_errno;
1126
1177
return false;
1127
1178
}
1128
1179
strcpy(ifr->ifr_name, ifname);
1129
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
1181
if(ret == -1){
1131
1182
if(debug){
1183
ret_errno = errno;
1132
1184
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1133
1186
}
1134
1187
return false;
1135
1188
}
1204
1257
}
1205
1258
1206
1259
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1289
}
1248
1290
1249
1291
int notdotentries(const struct dirent *direntry){
1318
1360
return 1;
1319
1361
}
1320
1362
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1322
1365
int ret;
1323
1366
struct timespec now;
1324
1367
struct timespec waited_time;
1325
1368
intmax_t block_time;
1326
1369
1327
1370
while(true){
1328
if(mc.current_server == NULL){
1371
if(mc->current_server == NULL){
1329
1372
if (debug){
1330
1373
fprintf_plus(stderr, "Wait until first server is found."
1331
1374
" No timeout!\n");
1345
1388
/* Calculating in ms how long time between now and server
1346
1389
who we visted longest time ago. Now - last seen. */
1347
1390
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1391
- mc->current_server->last_seen.tv_sec);
1349
1392
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1393
- mc->current_server->last_seen.tv_nsec);
1351
1394
/* total time is 10s/10,000ms.
1352
1395
Converting to s from ms by dividing by 1,000,
1353
1396
and ns to ms by dividing by 1,000,000. */
1361
1404
}
1362
1405
1363
1406
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1368
1411
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1412
avahi_simple_poll_quit(s);
1370
1413
return 0;
1371
1414
}
1372
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1416
&mc->current_server->last_seen);
1374
1417
if(ret == -1){
1375
1418
perror_plus("clock_gettime");
1376
1419
return -1;
1377
1420
}
1378
mc.current_server = mc.current_server->next;
1421
mc->current_server = mc->current_server->next;
1379
1422
block_time = 0; /* Call avahi to find new Mandos
1380
1423
servers, but don't block */
1381
1424
}
1390
1433
}
1391
1434
}
1392
1435
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
1393
1488
bool run_network_hooks(const char *mode, const char *interface,
1394
1489
const float delay){
1395
1490
struct dirent **direntries;
1398
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
1494
alphasort);
1400
1495
if(numhooks == -1){
1401
perror_plus("scandir");
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");
1503
}
1402
1504
} else {
1403
1505
int devnull = open("/dev/null", O_RDONLY);
1404
1506
for(int i = 0; i < numhooks; i++){
1417
1519
if(hook_pid == 0){
1418
1520
/* Child */
1419
1521
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1522
raise_privileges_permanently();
1431
1523
/* Set group */
1432
1524
errno = 0;
1433
1525
ret = setgid(0);
1526
1618
return true;
1527
1619
}
1528
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
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");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
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();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1529
1793
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1530
1798
AvahiSServiceBrowser *sb = NULL;
1531
int error;
1799
error_t ret_errno;
1532
1800
int ret;
1533
1801
intmax_t tmpmax;
1534
1802
char *tmp;
1535
1803
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
1542
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1543
1807
bool tempdir_created = false;
1544
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
1809
const char *seckey = PATHDIR "/" SECKEY;
1546
1810
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1547
1813
1548
1814
bool gnutls_initialized = false;
1549
1815
bool gpgme_initialized = false;
1640
1906
connect_to = arg;
1641
1907
break;
1642
1908
case 'i': /* --interface */
1643
interface = arg;
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1644
1914
break;
1645
1915
case 's': /* --seckey */
1646
1916
seckey = arg;
1724
1994
<http://bugs.debian.org/633582> */
1725
1995
1726
1996
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
1997
if(raise_privileges() == 0){
1732
1998
struct stat st;
1733
1999
1734
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1774
2040
}
1775
2041
1776
2042
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
1781
2060
}
1782
2061
}
1783
2062
}
1784
2063
1785
2064
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
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
}
1788
2081
}
1789
2082
1790
2083
if(not debug){
1791
2084
avahi_set_log_function(empty_log);
1792
2085
}
1793
2086
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1826
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
2088
from the signal handler */
1828
2089
/* Initialize the pseudo-RNG for Avahi */
1829
2090
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
1832
2093
fprintf_plus(stderr,
1833
2094
"Avahi: Failed to create simple poll object.\n");
1834
2095
exitcode = EX_UNAVAILABLE;
1898
2159
}
1899
2160
}
1900
2161
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
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
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
1986
2208
}
1987
2209
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2005
2210
break;
2006
2211
}
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2036
2237
}
2037
2238
2038
2239
if(quit_now){
2039
2240
goto end;
2040
2241
}
2041
2242
2042
ret = init_gnutls_global(pubkey, seckey);
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
2043
2244
if(ret == -1){
2044
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
2246
exitcode = EX_UNAVAILABLE;
2062
2263
goto end;
2063
2264
}
2064
2265
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2066
2267
fprintf_plus(stderr, "init_gpgme failed\n");
2067
2268
exitcode = EX_UNAVAILABLE;
2068
2269
goto end;
2078
2279
/* Connect directly, do not use Zeroconf */
2079
2280
/* (Mainly meant for debugging) */
2080
2281
char *address = strrchr(connect_to, ':');
2282
2081
2283
if(address == NULL){
2082
2284
fprintf_plus(stderr, "No colon in address\n");
2083
2285
exitcode = EX_USAGE;
2088
2290
goto end;
2089
2291
}
2090
2292
2091
uint16_t port;
2293
in_port_t port;
2092
2294
errno = 0;
2093
2295
tmpmax = strtoimax(address+1, &tmp, 10);
2094
2296
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2297
or tmpmax != (in_port_t)tmpmax){
2096
2298
fprintf_plus(stderr, "Bad port number\n");
2097
2299
exitcode = EX_USAGE;
2098
2300
goto end;
2099
2301
}
2100
2302
2101
2303
if(quit_now){
2102
2304
goto end;
2103
2305
}
2104
2306
2105
port = (uint16_t)tmpmax;
2307
port = (in_port_t)tmpmax;
2106
2308
*address = '\0';
2107
2309
/* Colon in address indicates IPv6 */
2108
2310
int af;
2124
2326
}
2125
2327
2126
2328
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
2128
2331
if(quit_now or ret == 0){
2129
2332
break;
2130
2333
}
2132
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
2336
(int)retry_interval);
2134
2337
}
2135
sleep((int)retry_interval);
2338
sleep((unsigned int)retry_interval);
2136
2339
}
2137
2340
2138
2341
if (not quit_now){
2156
2359
config.publish_domain = 0;
2157
2360
2158
2361
/* Allocate a new server */
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
2162
2364
2163
2365
/* Free the Avahi configuration data */
2164
2366
avahi_server_config_free(&config);
2167
2369
/* Check if creating the Avahi server object succeeded */
2168
2370
if(mc.server == NULL){
2169
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2372
avahi_strerror(ret_errno));
2171
2373
exitcode = EX_UNAVAILABLE;
2172
2374
goto end;
2173
2375
}
2179
2381
/* Create the Avahi service browser */
2180
2382
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
2383
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
2183
2386
if(sb == NULL){
2184
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
2388
avahi_strerror(avahi_server_errno(mc.server)));
2197
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
2401
}
2199
2402
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2202
2405
if(debug){
2203
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
2407
(ret == 0) ? "successfully" : "with error");
2211
2414
}
2212
2415
2213
2416
/* Cleanup things */
2417
free(mc.interfaces);
2418
2214
2419
if(sb != NULL)
2215
2420
avahi_s_service_browser_free(sb);
2216
2421
2217
2422
if(mc.server != NULL)
2218
2423
avahi_server_free(mc.server);
2219
2424
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
2222
2427
2223
2428
if(gnutls_initialized){
2224
2429
gnutls_certificate_free_credentials(mc.cred);
2241
2446
}
2242
2447
}
2243
2448
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
2449
/* Re-raise priviliges */
2248
2450
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
2253
}
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
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");
2265
2467
}
2266
2468
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2270
2472
}
2271
2473
}
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2474
2475
lower_privileges_permanently();
2476
}
2477
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2279
2480
2280
2481
/* Removes the GPGME temp directory and all files inside */
2281
2482
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0