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- Committer: Teddy Hogeborn
- Date: 2012-05-26 22:48:45 UTC
- Revision ID: teddy@recompile.se-20120526224845-imaxtrlh3j3yu1ga
* mandos: Change comment.
* mandos-clients.conf.xml (OPTIONS/checker): Rewrote without "you".
(SEE ALSO): Reference fping(8).
* mandos-clients.conf.xml (OPTIONS/checker): Rewrote without "you".
(SEE ALSO): Reference fping(8).
- files removed:
- debian/mandos-client.examples
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
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
/*
208
205
}
209
206
210
207
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
213
210
int ret;
214
211
server *new_server = malloc(sizeof(server));
215
212
if(new_server == NULL){
225
222
return false;
226
223
}
227
224
/* Special case of first server */
228
if(*current_server == NULL){
225
if (mc.current_server == NULL){
229
226
new_server->next = new_server;
230
227
new_server->prev = new_server;
231
*current_server = new_server;
228
mc.current_server = new_server;
232
229
/* Place the new server last in the list */
233
230
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
236
233
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
238
235
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
237
if(ret == -1){
241
238
perror_plus("clock_gettime");
242
239
return false;
248
245
* Initialize GPGME.
249
246
*/
250
247
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
248
const char *tempdir){
252
249
gpgme_error_t rc;
253
250
gpgme_engine_info_t engine_info;
254
251
252
255
253
/*
256
254
* Helper function to insert pub and seckey to the engine keyring.
257
255
*/
273
271
return false;
274
272
}
275
273
276
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
277
275
if(rc != GPG_ERR_NO_ERROR){
278
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
277
gpgme_strsource(rc), gpgme_strerror(rc));
323
321
}
324
322
325
323
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
327
325
if(rc != GPG_ERR_NO_ERROR){
328
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
342
*/
345
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
344
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
345
char **plaintext){
349
346
gpgme_data_t dh_crypto, dh_plain;
350
347
gpgme_error_t rc;
351
348
ssize_t ret;
377
374
378
375
/* Decrypt data from the cryptotext data buffer to the plaintext
379
376
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
378
if(rc != GPG_ERR_NO_ERROR){
382
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
380
gpgme_strsource(rc), gpgme_strerror(rc));
384
381
plaintext_length = -1;
385
382
if(debug){
386
383
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
388
385
if(result == NULL){
389
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
387
} else {
468
465
}
469
466
470
467
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
472
470
if(ret == NULL)
473
471
ret = "(unknown)";
474
472
return ret;
481
479
}
482
480
483
481
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
482
const char *seckeyfilename){
486
483
int ret;
487
484
488
485
if(debug){
505
502
}
506
503
507
504
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
509
506
if(ret != GNUTLS_E_SUCCESS){
510
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
508
safer_gnutls_strerror(ret));
521
518
}
522
519
523
520
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
525
522
GNUTLS_OPENPGP_FMT_BASE64);
526
523
if(ret != GNUTLS_E_SUCCESS){
527
524
fprintf_plus(stderr,
533
530
}
534
531
535
532
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
537
534
if(ret != GNUTLS_E_SUCCESS){
538
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
536
" initialization: %s\n",
540
537
safer_gnutls_strerror(ret));
541
538
goto globalfail;
542
539
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
541
if(ret != GNUTLS_E_SUCCESS){
545
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
543
safer_gnutls_strerror(ret));
547
544
goto globalfail;
548
545
}
549
546
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
548
552
549
return 0;
553
550
554
551
globalfail:
555
552
556
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
557
554
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
559
556
return -1;
560
557
}
561
558
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
564
560
int ret;
565
561
/* GnuTLS session creation */
566
562
do {
578
574
{
579
575
const char *err;
580
576
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
578
if(quit_now){
583
579
gnutls_deinit(*session);
584
580
return -1;
595
591
596
592
do {
597
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
594
mc.cred);
599
595
if(quit_now){
600
596
gnutls_deinit(*session);
601
597
return -1;
611
607
/* ignore client certificate if any. */
612
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
609
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
611
616
612
return 0;
617
613
}
621
617
__attribute__((unused)) const char *txt){}
622
618
623
619
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
625
621
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
622
int af){
627
623
int ret, tcp_sd = -1;
628
624
ssize_t sret;
629
625
union {
659
655
return -1;
660
656
}
661
657
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);
658
ret = init_gnutls_session(&session);
695
659
if(ret != 0){
696
660
return -1;
697
661
}
698
662
699
663
if(debug){
700
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
702
666
}
703
667
704
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
735
699
goto mandos_end;
736
700
}
737
701
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
739
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
708
-Wunreachable-code*/
765
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
766
733
perror_plus("if_indextoname");
767
734
} else {
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
770
737
}
771
738
} else {
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
774
741
}
775
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
969
936
if(buffer_length > 0){
970
937
ssize_t decrypted_buffer_size;
971
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
939
&decrypted_buffer);
973
940
if(decrypted_buffer_size >= 0){
974
941
975
942
written = 0;
1036
1003
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1004
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1005
flags,
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1043
1008
1044
1009
/* Called whenever a service has been resolved successfully or
1045
1010
timed out */
1054
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1055
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1056
1021
domain,
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
1022
avahi_strerror(avahi_server_errno(mc.server)));
1059
1023
break;
1060
1024
1061
1025
case AVAHI_RESOLVER_FOUND:
1067
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1068
1032
host_name, ip, (intmax_t)interface, port);
1069
1033
}
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1074
1036
if(ret == 0){
1075
avahi_simple_poll_quit(simple_poll);
1037
avahi_simple_poll_quit(mc.simple_poll);
1076
1038
} else {
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1080
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
1042
" list\n", name);
1082
1043
}
1095
1056
const char *domain,
1096
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1058
flags,
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1102
1061
1103
1062
/* Called whenever a new services becomes available on the LAN or
1104
1063
is removed from the LAN */
1112
1071
case AVAHI_BROWSER_FAILURE:
1113
1072
1114
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1115
avahi_strerror(avahi_server_errno
1116
(((mandos_context*)mc)->server)));
1117
avahi_simple_poll_quit(simple_poll);
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1118
1076
return;
1119
1077
1120
1078
case AVAHI_BROWSER_NEW:
1123
1081
the callback function is called the Avahi server will free the
1124
1082
resolver for us. */
1125
1083
1126
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1127
interface, protocol, name, type,
1128
domain, protocol, 0,
1129
resolve_callback, mc) == NULL)
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1130
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1131
1088
" %s\n", name,
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1089
avahi_strerror(avahi_server_errno(mc.server)));
1134
1090
break;
1135
1091
1136
1092
case AVAHI_BROWSER_REMOVE:
1155
1111
signal_received = sig;
1156
1112
int old_errno = errno;
1157
1113
/* set main loop to exit */
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1160
1116
}
1161
1117
errno = old_errno;
1162
1118
}
1163
1119
1164
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1121
int ret;
1166
error_t ret_errno;
1167
1122
1168
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1124
if(s < 0){
1170
ret_errno = errno;
1171
1125
perror_plus("socket");
1172
errno = ret_errno;
1173
1126
return false;
1174
1127
}
1175
1128
strcpy(ifr->ifr_name, ifname);
1176
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1130
if(ret == -1){
1178
1131
if(debug){
1179
ret_errno = errno;
1180
1132
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1182
1133
}
1183
1134
return false;
1184
1135
}
1253
1204
}
1254
1205
1255
1206
/*
1256
* This function determines if a network interface is up.
1257
*/
1258
bool interface_is_up(const char *interface){
1259
struct ifreq ifr;
1260
if(not get_flags(interface, &ifr)){
1261
if(debug){
1262
fprintf_plus(stderr, "Failed to get flags for interface "
1263
"\"%s\"\n", interface);
1264
}
1265
return false;
1266
}
1267
1268
return (bool)(ifr.ifr_flags & IFF_UP);
1269
}
1270
1271
/*
1272
* This function determines if a network interface is running
1273
*/
1274
bool interface_is_running(const char *interface){
1275
struct ifreq ifr;
1276
if(not get_flags(interface, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", interface);
1280
}
1281
return false;
1282
}
1283
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
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;
1285
1247
}
1286
1248
1287
1249
int notdotentries(const struct dirent *direntry){
1356
1318
return 1;
1357
1319
}
1358
1320
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1361
1322
int ret;
1362
1323
struct timespec now;
1363
1324
struct timespec waited_time;
1364
1325
intmax_t block_time;
1365
1326
1366
1327
while(true){
1367
if(mc->current_server == NULL){
1328
if(mc.current_server == NULL){
1368
1329
if (debug){
1369
1330
fprintf_plus(stderr, "Wait until first server is found."
1370
1331
" No timeout!\n");
1384
1345
/* Calculating in ms how long time between now and server
1385
1346
who we visted longest time ago. Now - last seen. */
1386
1347
waited_time.tv_sec = (now.tv_sec
1387
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1388
1349
waited_time.tv_nsec = (now.tv_nsec
1389
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1390
1351
/* total time is 10s/10,000ms.
1391
1352
Converting to s from ms by dividing by 1,000,
1392
1353
and ns to ms by dividing by 1,000,000. */
1400
1361
}
1401
1362
1402
1363
if(block_time <= 0){
1403
ret = start_mandos_communication(mc->current_server->ip,
1404
mc->current_server->port,
1405
mc->current_server->if_index,
1406
mc->current_server->af, mc);
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
1368
if(ret == 0){
1408
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1409
1370
return 0;
1410
1371
}
1411
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1412
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1413
1374
if(ret == -1){
1414
1375
perror_plus("clock_gettime");
1415
1376
return -1;
1416
1377
}
1417
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1418
1379
block_time = 0; /* Call avahi to find new Mandos
1419
1380
servers, but don't block */
1420
1381
}
1429
1390
}
1430
1391
}
1431
1392
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
1393
bool run_network_hooks(const char *mode, const char *interface,
1485
1394
const float delay){
1486
1395
struct dirent **direntries;
1489
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
1399
alphasort);
1491
1400
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
1401
perror_plus("scandir");
1500
1402
} else {
1501
1403
int devnull = open("/dev/null", O_RDONLY);
1502
1404
for(int i = 0; i < numhooks; i++){
1515
1417
if(hook_pid == 0){
1516
1418
/* Child */
1517
1419
/* Raise privileges */
1518
raise_privileges_permanently();
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
}
1519
1431
/* Set group */
1520
1432
errno = 0;
1521
1433
ret = setgid(0);
1614
1526
return true;
1615
1527
}
1616
1528
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1623
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1625
if(if_index == 0){
1626
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
errno = old_errno;
1628
return ENXIO;
1629
}
1630
1631
if(quit_now){
1632
errno = old_errno;
1633
return EINTR;
1634
}
1635
1636
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1638
ret_errno = errno;
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1640
"\"%s\"\n", interface);
1641
return ret_errno;
1642
}
1643
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1647
ret_errno = errno;
1648
perror_plus("socket");
1649
errno = old_errno;
1650
return ret_errno;
1651
}
1652
1653
if(quit_now){
1654
close(sd);
1655
errno = old_errno;
1656
return EINTR;
1657
}
1658
1659
if(debug){
1660
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
interface);
1662
}
1663
1664
/* Raise priviliges */
1665
raise_privileges();
1666
1667
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1675
}
1676
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret_linux = klogctl(7, NULL, 0);
1682
if(ret_linux == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
1688
/* Lower privileges */
1689
lower_privileges();
1690
1691
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1693
if(ret == -1){
1694
perror_plus("close");
1695
}
1696
1697
if(ret_setflags == -1){
1698
errno = ret_errno;
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
errno = old_errno;
1701
return ret_errno;
1702
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
}
1707
1708
/* Sleep checking until interface is running.
1709
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1712
break;
1713
}
1714
struct timespec sleeptime = { .tv_nsec = 250000000 };
1715
ret = nanosleep(&sleeptime, NULL);
1716
if(ret == -1 and errno != EINTR){
1717
perror_plus("nanosleep");
1718
}
1719
}
1720
1721
errno = old_errno;
1722
return 0;
1723
}
1724
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
if(interface_is_up(interface)){
1738
if(not get_flags(interface, &network) and debug){
1739
ret_errno = errno;
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
return ret_errno;
1743
}
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1748
ret_errno = errno;
1749
perror_plus("socket");
1750
errno = old_errno;
1751
return ret_errno;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
1767
1768
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
if(ret == -1){
1771
perror_plus("close");
1772
}
1773
1774
if(ret_setflags == -1){
1775
errno = ret_errno;
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
errno = old_errno;
1778
return ret_errno;
1779
}
1780
} else if(debug){
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1782
interface);
1783
}
1784
1785
errno = old_errno;
1786
return 0;
1787
}
1788
1789
1529
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
1794
1530
AvahiSServiceBrowser *sb = NULL;
1795
error_t ret_errno;
1531
int error;
1796
1532
int ret;
1797
1533
intmax_t tmpmax;
1798
1534
char *tmp;
1799
1535
int exitcode = EXIT_SUCCESS;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
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;
1802
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1803
1543
bool tempdir_created = false;
1804
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
1545
const char *seckey = PATHDIR "/" SECKEY;
1806
1546
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1547
1810
1548
bool gnutls_initialized = false;
1811
1549
bool gpgme_initialized = false;
1902
1640
connect_to = arg;
1903
1641
break;
1904
1642
case 'i': /* --interface */
1905
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1906
arg, (int)',');
1907
if(ret_errno != 0){
1908
argp_error(state, "%s", strerror(ret_errno));
1909
}
1643
interface = arg;
1910
1644
break;
1911
1645
case 's': /* --seckey */
1912
1646
seckey = arg;
1990
1724
<http://bugs.debian.org/633582> */
1991
1725
1992
1726
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
1994
1732
struct stat st;
1995
1733
1996
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2036
1774
}
2037
1775
2038
1776
/* Lower privileges */
2039
lower_privileges();
2040
}
2041
}
2042
2043
/* Remove invalid interface names (except "none") */
2044
{
2045
char *interface = NULL;
2046
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2047
interface))){
2048
if(strcmp(interface, "none") != 0
2049
and if_nametoindex(interface) == 0){
2050
if(interface[0] != '\0'){
2051
fprintf_plus(stderr, "Not using nonexisting interface"
2052
" \"%s\"\n", interface);
2053
}
2054
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2055
interface = NULL;
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2056
1781
}
2057
1782
}
2058
1783
}
2059
1784
2060
1785
/* Run network hooks */
2061
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
2066
goto end;
2067
}
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2077
1788
}
2078
1789
2079
1790
if(not debug){
2080
1791
avahi_set_log_function(empty_log);
2081
1792
}
2082
1793
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
2083
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2084
1827
from the signal handler */
2085
1828
/* Initialize the pseudo-RNG for Avahi */
2086
1829
srand((unsigned int) time(NULL));
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2089
1832
fprintf_plus(stderr,
2090
1833
"Avahi: Failed to create simple poll object.\n");
2091
1834
exitcode = EX_UNAVAILABLE;
2155
1898
}
2156
1899
}
2157
1900
2158
/* If no interfaces were specified, make a list */
2159
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2161
/* Look for any good interfaces */
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2163
alphasort);
2164
if(ret >= 1){
2165
/* Add all found interfaces to interfaces list */
2166
for(int i = 0; i < ret; ++i){
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
direntries[i]->d_name);
2169
if(ret_errno != 0){
2170
perror_plus("argz_add");
2171
continue;
2172
}
2173
if(debug){
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
direntries[i]->d_name);
2176
}
2177
}
2178
free(direntries);
2179
} else {
2180
free(direntries);
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2182
exitcode = EXIT_FAILURE;
2183
goto end;
2184
}
2185
}
2186
2187
/* Bring up interfaces which are down, and remove any "none"s */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
/* If interface name is "none", stop bringing up interfaces.
2193
Also remove all instances of "none" from the list */
2194
if(strcmp(interface, "none") == 0){
2195
argz_delete(&mc.interfaces, &mc.interfaces_size,
2196
interface);
2197
interface = NULL;
2198
while((interface = argz_next(mc.interfaces,
2199
mc.interfaces_size, interface))){
2200
if(strcmp(interface, "none") == 0){
2201
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
interface);
2203
interface = NULL;
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");
2204
1986
}
2205
1987
}
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){
2206
2005
break;
2207
2006
}
2208
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2210
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2214
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2218
}
2219
}
2220
}
2221
if(debug and (interfaces_to_take_down == NULL)){
2222
fprintf_plus(stderr, "No interfaces were brought up\n");
2223
}
2224
}
2225
2226
/* If we only got one interface, explicitly use only that one */
2227
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2228
if(debug){
2229
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2230
mc.interfaces);
2231
}
2232
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
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
}
2233
2036
}
2234
2037
2235
2038
if(quit_now){
2236
2039
goto end;
2237
2040
}
2238
2041
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2042
ret = init_gnutls_global(pubkey, seckey);
2240
2043
if(ret == -1){
2241
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
2045
exitcode = EX_UNAVAILABLE;
2259
2062
goto end;
2260
2063
}
2261
2064
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2263
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2264
2067
exitcode = EX_UNAVAILABLE;
2265
2068
goto end;
2275
2078
/* Connect directly, do not use Zeroconf */
2276
2079
/* (Mainly meant for debugging) */
2277
2080
char *address = strrchr(connect_to, ':');
2278
2279
2081
if(address == NULL){
2280
2082
fprintf_plus(stderr, "No colon in address\n");
2281
2083
exitcode = EX_USAGE;
2286
2088
goto end;
2287
2089
}
2288
2090
2289
in_port_t port;
2091
uint16_t port;
2290
2092
errno = 0;
2291
2093
tmpmax = strtoimax(address+1, &tmp, 10);
2292
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2293
or tmpmax != (in_port_t)tmpmax){
2095
or tmpmax != (uint16_t)tmpmax){
2294
2096
fprintf_plus(stderr, "Bad port number\n");
2295
2097
exitcode = EX_USAGE;
2296
2098
goto end;
2297
2099
}
2298
2100
2299
2101
if(quit_now){
2300
2102
goto end;
2301
2103
}
2302
2104
2303
port = (in_port_t)tmpmax;
2105
port = (uint16_t)tmpmax;
2304
2106
*address = '\0';
2305
2107
/* Colon in address indicates IPv6 */
2306
2108
int af;
2322
2124
}
2323
2125
2324
2126
while(not quit_now){
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2127
ret = start_mandos_communication(address, port, if_index, af);
2327
2128
if(quit_now or ret == 0){
2328
2129
break;
2329
2130
}
2331
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
2133
(int)retry_interval);
2333
2134
}
2334
sleep((unsigned int)retry_interval);
2135
sleep((int)retry_interval);
2335
2136
}
2336
2137
2337
2138
if (not quit_now){
2355
2156
config.publish_domain = 0;
2356
2157
2357
2158
/* Allocate a new server */
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2360
2162
2361
2163
/* Free the Avahi configuration data */
2362
2164
avahi_server_config_free(&config);
2365
2167
/* Check if creating the Avahi server object succeeded */
2366
2168
if(mc.server == NULL){
2367
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2170
avahi_strerror(error));
2369
2171
exitcode = EX_UNAVAILABLE;
2370
2172
goto end;
2371
2173
}
2377
2179
/* Create the Avahi service browser */
2378
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2379
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2182
NULL, 0, browse_callback, NULL);
2382
2183
if(sb == NULL){
2383
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
2185
avahi_strerror(avahi_server_errno(mc.server)));
2396
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
2198
}
2398
2199
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2401
2202
if(debug){
2402
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
2204
(ret == 0) ? "successfully" : "with error");
2410
2211
}
2411
2212
2412
2213
/* Cleanup things */
2413
free(mc.interfaces);
2414
2415
2214
if(sb != NULL)
2416
2215
avahi_s_service_browser_free(sb);
2417
2216
2418
2217
if(mc.server != NULL)
2419
2218
avahi_server_free(mc.server);
2420
2219
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2423
2222
2424
2223
if(gnutls_initialized){
2425
2224
gnutls_certificate_free_credentials(mc.cred);
2442
2241
}
2443
2242
}
2444
2243
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2445
2247
/* Re-raise priviliges */
2446
2248
{
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
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");
2463
2265
}
2464
2266
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2468
2270
}
2469
2271
}
2470
2471
lower_privileges_permanently();
2472
}
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2476
2279
2477
2280
/* Removes the GPGME temp directory and all files inside */
2478
2281
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0