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- Committer: Teddy Hogeborn
- Date: 2012-06-01 21:48:12 UTC
- Revision ID: teddy@recompile.se-20120601214812-g7685v5oeiuhi2qw
* debian/copyright (Copyright): Join the two lines to one line.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
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;
163
159
server *current_server;
164
160
} mandos_context;
165
161
166
/* global so signal handler can reach it*/
167
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 };
168
167
169
168
sig_atomic_t quit_now = 0;
170
169
int signal_received = 0;
206
205
}
207
206
208
207
/* Add server to set of servers to retry periodically */
209
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
210
int af, server **current_server){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
211
210
int ret;
212
211
server *new_server = malloc(sizeof(server));
213
212
if(new_server == NULL){
223
222
return false;
224
223
}
225
224
/* Special case of first server */
226
if(*current_server == NULL){
225
if (mc.current_server == NULL){
227
226
new_server->next = new_server;
228
227
new_server->prev = new_server;
229
*current_server = new_server;
228
mc.current_server = new_server;
230
229
/* Place the new server last in the list */
231
230
} else {
232
new_server->next = *current_server;
233
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
234
233
new_server->prev->next = new_server;
235
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
236
235
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
238
237
if(ret == -1){
239
238
perror_plus("clock_gettime");
240
239
return false;
246
245
* Initialize GPGME.
247
246
*/
248
247
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
248
const char *tempdir){
250
249
gpgme_error_t rc;
251
250
gpgme_engine_info_t engine_info;
252
251
252
253
253
/*
254
254
* Helper function to insert pub and seckey to the engine keyring.
255
255
*/
271
271
return false;
272
272
}
273
273
274
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
275
275
if(rc != GPG_ERR_NO_ERROR){
276
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
277
gpgme_strsource(rc), gpgme_strerror(rc));
321
321
}
322
322
323
323
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
325
325
if(rc != GPG_ERR_NO_ERROR){
326
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
342
342
*/
343
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
344
size_t crypto_size,
345
char **plaintext,
346
mandos_context *mc){
345
char **plaintext){
347
346
gpgme_data_t dh_crypto, dh_plain;
348
347
gpgme_error_t rc;
349
348
ssize_t ret;
375
374
376
375
/* Decrypt data from the cryptotext data buffer to the plaintext
377
376
data buffer */
378
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
379
378
if(rc != GPG_ERR_NO_ERROR){
380
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
380
gpgme_strsource(rc), gpgme_strerror(rc));
382
381
plaintext_length = -1;
383
382
if(debug){
384
383
gpgme_decrypt_result_t result;
385
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
386
385
if(result == NULL){
387
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
388
387
} else {
466
465
}
467
466
468
467
static const char * safer_gnutls_strerror(int value){
469
const char *ret = gnutls_strerror(value);
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
470
if(ret == NULL)
471
471
ret = "(unknown)";
472
472
return ret;
479
479
}
480
480
481
481
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename,
483
mandos_context *mc){
482
const char *seckeyfilename){
484
483
int ret;
485
484
486
485
if(debug){
503
502
}
504
503
505
504
/* OpenPGP credentials */
506
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
507
506
if(ret != GNUTLS_E_SUCCESS){
508
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
508
safer_gnutls_strerror(ret));
519
518
}
520
519
521
520
ret = gnutls_certificate_set_openpgp_key_file
522
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
523
522
GNUTLS_OPENPGP_FMT_BASE64);
524
523
if(ret != GNUTLS_E_SUCCESS){
525
524
fprintf_plus(stderr,
531
530
}
532
531
533
532
/* GnuTLS server initialization */
534
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
535
534
if(ret != GNUTLS_E_SUCCESS){
536
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
537
536
" initialization: %s\n",
538
537
safer_gnutls_strerror(ret));
539
538
goto globalfail;
540
539
}
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
542
541
if(ret != GNUTLS_E_SUCCESS){
543
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
543
safer_gnutls_strerror(ret));
545
544
goto globalfail;
546
545
}
547
546
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
549
548
550
549
return 0;
551
550
552
551
globalfail:
553
552
554
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
555
554
gnutls_global_deinit();
556
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
557
556
return -1;
558
557
}
559
558
560
static int init_gnutls_session(gnutls_session_t *session,
561
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
562
560
int ret;
563
561
/* GnuTLS session creation */
564
562
do {
576
574
{
577
575
const char *err;
578
576
do {
579
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
578
if(quit_now){
581
579
gnutls_deinit(*session);
582
580
return -1;
593
591
594
592
do {
595
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc->cred);
594
mc.cred);
597
595
if(quit_now){
598
596
gnutls_deinit(*session);
599
597
return -1;
609
607
/* ignore client certificate if any. */
610
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
609
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
611
614
612
return 0;
615
613
}
619
617
__attribute__((unused)) const char *txt){}
620
618
621
619
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
623
621
AvahiIfIndex if_index,
624
int af, mandos_context *mc){
622
int af){
625
623
int ret, tcp_sd = -1;
626
624
ssize_t sret;
627
625
union {
657
655
return -1;
658
656
}
659
657
660
ret = init_gnutls_session(&session, mc);
658
ret = init_gnutls_session(&session);
661
659
if(ret != 0){
662
660
return -1;
663
661
}
664
662
665
663
if(debug){
666
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
668
666
}
669
667
670
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
701
699
goto mandos_end;
702
700
}
703
701
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
708
-Wunreachable-code*/
731
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
732
733
perror_plus("if_indextoname");
733
734
} else {
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
736
737
}
737
738
} else {
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
740
741
}
741
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
935
936
if(buffer_length > 0){
936
937
ssize_t decrypted_buffer_size;
937
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer, mc);
939
&decrypted_buffer);
939
940
if(decrypted_buffer_size >= 0){
940
941
941
942
written = 0;
1002
1003
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1004
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1005
flags,
1005
void* mc){
1006
if(r == NULL){
1007
return;
1008
}
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1009
1008
1010
1009
/* Called whenever a service has been resolved successfully or
1011
1010
timed out */
1020
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
1021
domain,
1023
avahi_strerror(avahi_server_errno
1024
(((mandos_context*)mc)->server)));
1022
avahi_strerror(avahi_server_errno(mc.server)));
1025
1023
break;
1026
1024
1027
1025
case AVAHI_RESOLVER_FOUND:
1033
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
1032
host_name, ip, (intmax_t)interface, port);
1035
1033
}
1036
int ret = start_mandos_communication(ip, (in_port_t)port,
1037
interface,
1038
avahi_proto_to_af(proto),
1039
mc);
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1040
1036
if(ret == 0){
1041
avahi_simple_poll_quit(simple_poll);
1037
avahi_simple_poll_quit(mc.simple_poll);
1042
1038
} else {
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto),
1045
&((mandos_context*)mc)->current_server)){
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1046
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1047
1042
" list\n", name);
1048
1043
}
1061
1056
const char *domain,
1062
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1063
1058
flags,
1064
void* mc){
1065
if(b == NULL){
1066
return;
1067
}
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1068
1061
1069
1062
/* Called whenever a new services becomes available on the LAN or
1070
1063
is removed from the LAN */
1078
1071
case AVAHI_BROWSER_FAILURE:
1079
1072
1080
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
1083
avahi_simple_poll_quit(simple_poll);
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1084
1076
return;
1085
1077
1086
1078
case AVAHI_BROWSER_NEW:
1089
1081
the callback function is called the Avahi server will free the
1090
1082
resolver for us. */
1091
1083
1092
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1093
interface, protocol, name, type,
1094
domain, protocol, 0,
1095
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)
1096
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1097
1088
" %s\n", name,
1098
avahi_strerror(avahi_server_errno
1099
(((mandos_context*)mc)->server)));
1089
avahi_strerror(avahi_server_errno(mc.server)));
1100
1090
break;
1101
1091
1102
1092
case AVAHI_BROWSER_REMOVE:
1121
1111
signal_received = sig;
1122
1112
int old_errno = errno;
1123
1113
/* set main loop to exit */
1124
if(simple_poll != NULL){
1125
avahi_simple_poll_quit(simple_poll);
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1126
1116
}
1127
1117
errno = old_errno;
1128
1118
}
1129
1119
1130
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
1121
int ret;
1132
error_t ret_errno;
1133
1122
1134
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1135
1124
if(s < 0){
1136
ret_errno = errno;
1137
1125
perror_plus("socket");
1138
errno = ret_errno;
1139
1126
return false;
1140
1127
}
1141
1128
strcpy(ifr->ifr_name, ifname);
1142
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1143
1130
if(ret == -1){
1144
1131
if(debug){
1145
ret_errno = errno;
1146
1132
perror_plus("ioctl SIOCGIFFLAGS");
1147
errno = ret_errno;
1148
1133
}
1149
1134
return false;
1150
1135
}
1219
1204
}
1220
1205
1221
1206
/*
1222
* This function determines if a network interface is up.
1223
*/
1224
bool interface_is_up(const char *interface){
1225
struct ifreq ifr;
1226
if(not get_flags(interface, &ifr)){
1227
if(debug){
1228
fprintf_plus(stderr, "Failed to get flags for interface "
1229
"\"%s\"\n", interface);
1230
}
1231
return false;
1232
}
1233
1234
return (bool)(ifr.ifr_flags & IFF_UP);
1235
}
1236
1237
/*
1238
* This function determines if a network interface is running
1239
*/
1240
bool interface_is_running(const char *interface){
1241
struct ifreq ifr;
1242
if(not get_flags(interface, &ifr)){
1243
if(debug){
1244
fprintf_plus(stderr, "Failed to get flags for interface "
1245
"\"%s\"\n", interface);
1246
}
1247
return false;
1248
}
1249
1250
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;
1251
1247
}
1252
1248
1253
1249
int notdotentries(const struct dirent *direntry){
1322
1318
return 1;
1323
1319
}
1324
1320
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1327
1322
int ret;
1328
1323
struct timespec now;
1329
1324
struct timespec waited_time;
1330
1325
intmax_t block_time;
1331
1326
1332
1327
while(true){
1333
if(mc->current_server == NULL){
1328
if(mc.current_server == NULL){
1334
1329
if (debug){
1335
1330
fprintf_plus(stderr, "Wait until first server is found."
1336
1331
" No timeout!\n");
1350
1345
/* Calculating in ms how long time between now and server
1351
1346
who we visted longest time ago. Now - last seen. */
1352
1347
waited_time.tv_sec = (now.tv_sec
1353
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1354
1349
waited_time.tv_nsec = (now.tv_nsec
1355
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1356
1351
/* total time is 10s/10,000ms.
1357
1352
Converting to s from ms by dividing by 1,000,
1358
1353
and ns to ms by dividing by 1,000,000. */
1366
1361
}
1367
1362
1368
1363
if(block_time <= 0){
1369
ret = start_mandos_communication(mc->current_server->ip,
1370
mc->current_server->port,
1371
mc->current_server->if_index,
1372
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);
1373
1368
if(ret == 0){
1374
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1375
1370
return 0;
1376
1371
}
1377
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1379
1374
if(ret == -1){
1380
1375
perror_plus("clock_gettime");
1381
1376
return -1;
1382
1377
}
1383
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1384
1379
block_time = 0; /* Call avahi to find new Mandos
1385
1380
servers, but don't block */
1386
1381
}
1395
1390
}
1396
1391
}
1397
1392
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1403
ret_errno = errno;
1404
perror_plus("seteuid");
1405
}
1406
errno = old_errno;
1407
return ret_errno;
1408
}
1409
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1414
if(ret_errno != 0){
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
if(setuid(0) == -1){
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1421
}
1422
errno = old_errno;
1423
return ret_errno;
1424
}
1425
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1433
}
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1443
ret_errno = errno;
1444
perror_plus("setuid");
1445
}
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
1450
1393
bool run_network_hooks(const char *mode, const char *interface,
1451
1394
const float delay){
1452
1395
struct dirent **direntries;
1455
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
1399
alphasort);
1457
1400
if(numhooks == -1){
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
perror_plus("scandir");
1465
}
1401
perror_plus("scandir");
1466
1402
} else {
1467
1403
int devnull = open("/dev/null", O_RDONLY);
1468
1404
for(int i = 0; i < numhooks; i++){
1481
1417
if(hook_pid == 0){
1482
1418
/* Child */
1483
1419
/* Raise privileges */
1484
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
}
1485
1431
/* Set group */
1486
1432
errno = 0;
1487
1433
ret = setgid(0);
1580
1526
return true;
1581
1527
}
1582
1528
1583
error_t bring_up_interface(const char *const interface,
1584
const float delay){
1585
int sd = -1;
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1589
struct ifreq network;
1590
unsigned int if_index = if_nametoindex(interface);
1591
if(if_index == 0){
1592
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1593
errno = old_errno;
1594
return ENXIO;
1595
}
1596
1597
if(quit_now){
1598
errno = old_errno;
1599
return EINTR;
1600
}
1601
1602
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
1604
ret_errno = errno;
1605
fprintf_plus(stderr, "Failed to get flags for interface "
1606
"\"%s\"\n", interface);
1607
return ret_errno;
1608
}
1609
network.ifr_flags |= IFF_UP;
1610
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
1613
ret_errno = errno;
1614
perror_plus("socket");
1615
errno = old_errno;
1616
return ret_errno;
1617
}
1618
1619
if(quit_now){
1620
close(sd);
1621
errno = old_errno;
1622
return EINTR;
1623
}
1624
1625
if(debug){
1626
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1627
interface);
1628
}
1629
1630
/* Raise priviliges */
1631
raise_privileges();
1632
1633
#ifdef __linux__
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
1641
}
1642
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
1645
#ifdef __linux__
1646
if(restore_loglevel){
1647
ret_linux = klogctl(7, NULL, 0);
1648
if(ret_linux == -1){
1649
perror_plus("klogctl");
1650
}
1651
}
1652
#endif /* __linux__ */
1653
1654
/* Lower privileges */
1655
lower_privileges();
1656
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1659
if(ret == -1){
1660
perror_plus("close");
1661
}
1662
1663
if(ret_setflags == -1){
1664
errno = ret_errno;
1665
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
errno = old_errno;
1667
return ret_errno;
1668
}
1669
} else if(debug){
1670
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1671
interface);
1672
}
1673
1674
/* Sleep checking until interface is running.
1675
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
1677
if(interface_is_running(interface)){
1678
break;
1679
}
1680
struct timespec sleeptime = { .tv_nsec = 250000000 };
1681
ret = nanosleep(&sleeptime, NULL);
1682
if(ret == -1 and errno != EINTR){
1683
perror_plus("nanosleep");
1684
}
1685
}
1686
1687
errno = old_errno;
1688
return 0;
1689
}
1690
1691
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
1696
struct ifreq network;
1697
unsigned int if_index = if_nametoindex(interface);
1698
if(if_index == 0){
1699
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1700
errno = old_errno;
1701
return ENXIO;
1702
}
1703
if(interface_is_up(interface)){
1704
if(not get_flags(interface, &network) and debug){
1705
ret_errno = errno;
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", interface);
1708
return ret_errno;
1709
}
1710
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
1714
ret_errno = errno;
1715
perror_plus("socket");
1716
errno = old_errno;
1717
return ret_errno;
1718
}
1719
1720
if(debug){
1721
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1722
interface);
1723
}
1724
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
lower_privileges();
1733
1734
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1736
if(ret == -1){
1737
perror_plus("close");
1738
}
1739
1740
if(ret_setflags == -1){
1741
errno = ret_errno;
1742
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
errno = old_errno;
1744
return ret_errno;
1745
}
1746
} else if(debug){
1747
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1748
interface);
1749
}
1750
1751
errno = old_errno;
1752
return 0;
1753
}
1754
1755
1529
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1759
1530
AvahiSServiceBrowser *sb = NULL;
1760
error_t ret_errno;
1531
int error;
1761
1532
int ret;
1762
1533
intmax_t tmpmax;
1763
1534
char *tmp;
1764
1535
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
char *interfaces_to_take_down = NULL;
1768
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;
1769
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1770
1543
bool tempdir_created = false;
1771
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
1545
const char *seckey = PATHDIR "/" SECKEY;
1773
1546
const char *pubkey = PATHDIR "/" PUBKEY;
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1776
1547
1777
1548
bool gnutls_initialized = false;
1778
1549
bool gpgme_initialized = false;
1869
1640
connect_to = arg;
1870
1641
break;
1871
1642
case 'i': /* --interface */
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
1874
if(ret_errno != 0){
1875
argp_error(state, "%s", strerror(ret_errno));
1876
}
1643
interface = arg;
1877
1644
break;
1878
1645
case 's': /* --seckey */
1879
1646
seckey = arg;
1957
1724
<http://bugs.debian.org/633582> */
1958
1725
1959
1726
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
1961
1732
struct stat st;
1962
1733
1963
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2011
1782
}
2012
1783
}
2013
1784
2014
/* Remove empty interface names */
2015
{
2016
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2018
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2021
fprintf_plus(stderr, "Not using nonexisting interface"
2022
" \"%s\"\n", interface);
2023
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2025
interface = NULL;
2026
}
2027
}
2028
}
2029
2030
1785
/* Run network hooks */
2031
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2035
if(interfaces_hooks == NULL){
2036
perror_plus("malloc");
2037
goto end;
2038
}
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2048
1788
}
2049
1789
2050
1790
if(not debug){
2051
1791
avahi_set_log_function(empty_log);
2052
1792
}
2053
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
2054
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2055
1827
from the signal handler */
2056
1828
/* Initialize the pseudo-RNG for Avahi */
2057
1829
srand((unsigned int) time(NULL));
2058
simple_poll = avahi_simple_poll_new();
2059
if(simple_poll == NULL){
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2060
1832
fprintf_plus(stderr,
2061
1833
"Avahi: Failed to create simple poll object.\n");
2062
1834
exitcode = EX_UNAVAILABLE;
2126
1898
}
2127
1899
}
2128
1900
2129
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2132
/* Look for any good interfaces */
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2134
alphasort);
2135
if(ret >= 1){
2136
/* Add all found interfaces to interfaces list */
2137
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2139
direntries[i]->d_name);
2140
if(ret_errno != 0){
2141
perror_plus("argz_add");
2142
continue;
2143
}
2144
if(debug){
2145
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
direntries[i]->d_name);
2147
}
2148
}
2149
free(direntries);
2150
} else {
2151
free(direntries);
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2153
exitcode = EXIT_FAILURE;
2154
goto end;
2155
}
2156
}
2157
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2170
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2172
interface))){
2173
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2175
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2178
perror_plus("Failed to bring up interface");
2179
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2183
}
2184
}
2185
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
if(debug and (interfaces_to_take_down == NULL)){
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
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");
1986
}
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){
2005
break;
2006
}
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");
2191
2035
}
2192
2036
}
2193
2037
2195
2039
goto end;
2196
2040
}
2197
2041
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
2042
ret = init_gnutls_global(pubkey, seckey);
2199
2043
if(ret == -1){
2200
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2201
2045
exitcode = EX_UNAVAILABLE;
2218
2062
goto end;
2219
2063
}
2220
2064
2221
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2222
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2223
2067
exitcode = EX_UNAVAILABLE;
2224
2068
goto end;
2234
2078
/* Connect directly, do not use Zeroconf */
2235
2079
/* (Mainly meant for debugging) */
2236
2080
char *address = strrchr(connect_to, ':');
2237
2238
2081
if(address == NULL){
2239
2082
fprintf_plus(stderr, "No colon in address\n");
2240
2083
exitcode = EX_USAGE;
2245
2088
goto end;
2246
2089
}
2247
2090
2248
in_port_t port;
2091
uint16_t port;
2249
2092
errno = 0;
2250
2093
tmpmax = strtoimax(address+1, &tmp, 10);
2251
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2252
or tmpmax != (in_port_t)tmpmax){
2095
or tmpmax != (uint16_t)tmpmax){
2253
2096
fprintf_plus(stderr, "Bad port number\n");
2254
2097
exitcode = EX_USAGE;
2255
2098
goto end;
2259
2102
goto end;
2260
2103
}
2261
2104
2262
port = (in_port_t)tmpmax;
2105
port = (uint16_t)tmpmax;
2263
2106
*address = '\0';
2264
2107
/* Colon in address indicates IPv6 */
2265
2108
int af;
2281
2124
}
2282
2125
2283
2126
while(not quit_now){
2284
ret = start_mandos_communication(address, port, if_index, af,
2285
&mc);
2127
ret = start_mandos_communication(address, port, if_index, af);
2286
2128
if(quit_now or ret == 0){
2287
2129
break;
2288
2130
}
2314
2156
config.publish_domain = 0;
2315
2157
2316
2158
/* Allocate a new server */
2317
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2319
2162
2320
2163
/* Free the Avahi configuration data */
2321
2164
avahi_server_config_free(&config);
2324
2167
/* Check if creating the Avahi server object succeeded */
2325
2168
if(mc.server == NULL){
2326
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
2170
avahi_strerror(error));
2328
2171
exitcode = EX_UNAVAILABLE;
2329
2172
goto end;
2330
2173
}
2336
2179
/* Create the Avahi service browser */
2337
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2338
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2339
NULL, 0, browse_callback,
2340
(void *)&mc);
2182
NULL, 0, browse_callback, NULL);
2341
2183
if(sb == NULL){
2342
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2343
2185
avahi_strerror(avahi_server_errno(mc.server)));
2355
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2356
2198
}
2357
2199
2358
ret = avahi_loop_with_timeout(simple_poll,
2359
(int)(retry_interval * 1000), &mc);
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2360
2202
if(debug){
2361
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2362
2204
(ret == 0) ? "successfully" : "with error");
2375
2217
if(mc.server != NULL)
2376
2218
avahi_server_free(mc.server);
2377
2219
2378
if(simple_poll != NULL)
2379
avahi_simple_poll_free(simple_poll);
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2380
2222
2381
2223
if(gnutls_initialized){
2382
2224
gnutls_certificate_free_credentials(mc.cred);
2399
2241
}
2400
2242
}
2401
2243
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2402
2247
/* Re-raise priviliges */
2403
2248
{
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
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");
2420
2265
}
2421
2266
}
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2425
2270
}
2426
2271
}
2427
2428
lower_privileges_permanently();
2429
}
2430
2431
free(interfaces_to_take_down);
2432
free(interfaces_hooks);
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2433
2279
2434
2280
/* Removes the GPGME temp directory and all files inside */
2435
2281
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0