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- Committer: Teddy Hogeborn
- Date: 2013-10-13 19:12:58 UTC
- mfrom: (237.4.35 release)
- Revision ID: teddy@recompile.se-20131013191258-2a4lmsq5eqbw0sy1
Merge from release branch.
- files added:
- debian/mandos-client.examples
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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);
706
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
741
-Wunreachable-code*/
732
765
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
766
perror_plus("if_indextoname");
734
767
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
737
770
}
738
771
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
741
774
}
742
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
821
854
goto mandos_end;
822
855
}
823
856
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
857
/* This casting via intptr_t is to eliminate warning about casting
858
an int to a pointer type. This is exactly how the GnuTLS Guile
859
function "set-session-transport-fd!" does it. */
860
gnutls_transport_set_ptr(session,
861
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
862
827
863
if(quit_now){
828
864
errno = EINTR;
933
969
if(buffer_length > 0){
934
970
ssize_t decrypted_buffer_size;
935
971
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
972
&decrypted_buffer, mc);
937
973
if(decrypted_buffer_size >= 0){
938
974
939
975
written = 0;
1000
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1038
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
1005
1043
1006
1044
/* Called whenever a service has been resolved successfully or
1007
1045
timed out */
1016
1054
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1055
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1056
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
1020
1059
break;
1021
1060
1022
1061
case AVAHI_RESOLVER_FOUND:
1028
1067
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1068
host_name, ip, (intmax_t)interface, port);
1030
1069
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1033
1074
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1075
avahi_simple_poll_quit(simple_poll);
1035
1076
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1038
1080
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1081
" list\n", name);
1040
1082
}
1053
1095
const char *domain,
1054
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1097
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1058
1102
1059
1103
/* Called whenever a new services becomes available on the LAN or
1060
1104
is removed from the LAN */
1068
1112
case AVAHI_BROWSER_FAILURE:
1069
1113
1070
1114
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1115
avahi_strerror(avahi_server_errno
1116
(((mandos_context*)mc)->server)));
1117
avahi_simple_poll_quit(simple_poll);
1073
1118
return;
1074
1119
1075
1120
case AVAHI_BROWSER_NEW:
1078
1123
the callback function is called the Avahi server will free the
1079
1124
resolver for us. */
1080
1125
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
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
1130
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1131
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1087
1134
break;
1088
1135
1089
1136
case AVAHI_BROWSER_REMOVE:
1108
1155
signal_received = sig;
1109
1156
int old_errno = errno;
1110
1157
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1113
1160
}
1114
1161
errno = old_errno;
1115
1162
}
1116
1163
1117
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1165
int ret;
1166
error_t ret_errno;
1119
1167
1120
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1169
if(s < 0){
1170
ret_errno = errno;
1122
1171
perror_plus("socket");
1172
errno = ret_errno;
1123
1173
return false;
1124
1174
}
1125
1175
strcpy(ifr->ifr_name, ifname);
1126
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1177
if(ret == -1){
1128
1178
if(debug){
1179
ret_errno = errno;
1129
1180
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1130
1182
}
1131
1183
return false;
1132
1184
}
1201
1253
}
1202
1254
1203
1255
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
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);
1244
1285
}
1245
1286
1246
1287
int notdotentries(const struct dirent *direntry){
1315
1356
return 1;
1316
1357
}
1317
1358
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1319
1361
int ret;
1320
1362
struct timespec now;
1321
1363
struct timespec waited_time;
1322
1364
intmax_t block_time;
1323
1365
1324
1366
while(true){
1325
if(mc.current_server == NULL){
1367
if(mc->current_server == NULL){
1326
1368
if (debug){
1327
1369
fprintf_plus(stderr, "Wait until first server is found."
1328
1370
" No timeout!\n");
1342
1384
/* Calculating in ms how long time between now and server
1343
1385
who we visted longest time ago. Now - last seen. */
1344
1386
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1387
- mc->current_server->last_seen.tv_sec);
1346
1388
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1389
- mc->current_server->last_seen.tv_nsec);
1348
1390
/* total time is 10s/10,000ms.
1349
1391
Converting to s from ms by dividing by 1,000,
1350
1392
and ns to ms by dividing by 1,000,000. */
1358
1400
}
1359
1401
1360
1402
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
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);
1365
1407
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1408
avahi_simple_poll_quit(s);
1367
1409
return 0;
1368
1410
}
1369
1411
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1412
&mc->current_server->last_seen);
1371
1413
if(ret == -1){
1372
1414
perror_plus("clock_gettime");
1373
1415
return -1;
1374
1416
}
1375
mc.current_server = mc.current_server->next;
1417
mc->current_server = mc->current_server->next;
1376
1418
block_time = 0; /* Call avahi to find new Mandos
1377
1419
servers, but don't block */
1378
1420
}
1387
1429
}
1388
1430
}
1389
1431
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
1390
1484
bool run_network_hooks(const char *mode, const char *interface,
1391
1485
const float delay){
1392
1486
struct dirent **direntries;
1395
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
1490
alphasort);
1397
1491
if(numhooks == -1){
1398
perror_plus("scandir");
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
}
1399
1500
} else {
1400
1501
int devnull = open("/dev/null", O_RDONLY);
1401
1502
for(int i = 0; i < numhooks; i++){
1414
1515
if(hook_pid == 0){
1415
1516
/* Child */
1416
1517
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1518
raise_privileges_permanently();
1428
1519
/* Set group */
1429
1520
errno = 0;
1430
1521
ret = setgid(0);
1523
1614
return true;
1524
1615
}
1525
1616
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
1526
1789
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 };
1527
1794
AvahiSServiceBrowser *sb = NULL;
1528
int error;
1795
error_t ret_errno;
1529
1796
int ret;
1530
1797
intmax_t tmpmax;
1531
1798
char *tmp;
1532
1799
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1539
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1540
1803
bool tempdir_created = false;
1541
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
1805
const char *seckey = PATHDIR "/" SECKEY;
1543
1806
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1544
1809
1545
1810
bool gnutls_initialized = false;
1546
1811
bool gpgme_initialized = false;
1637
1902
connect_to = arg;
1638
1903
break;
1639
1904
case 'i': /* --interface */
1640
interface = arg;
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
}
1641
1910
break;
1642
1911
case 's': /* --seckey */
1643
1912
seckey = arg;
1721
1990
<http://bugs.debian.org/633582> */
1722
1991
1723
1992
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1993
if(raise_privileges() == 0){
1729
1994
struct stat st;
1730
1995
1731
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1771
2036
}
1772
2037
1773
2038
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
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;
1778
2056
}
1779
2057
}
1780
2058
}
1781
2059
1782
2060
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
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
}
1785
2077
}
1786
2078
1787
2079
if(not debug){
1788
2080
avahi_set_log_function(empty_log);
1789
2081
}
1790
2082
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
2083
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2084
from the signal handler */
1825
2085
/* Initialize the pseudo-RNG for Avahi */
1826
2086
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
1829
2089
fprintf_plus(stderr,
1830
2090
"Avahi: Failed to create simple poll object.\n");
1831
2091
exitcode = EX_UNAVAILABLE;
1895
2155
}
1896
2156
}
1897
2157
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
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;
1983
2204
}
1984
2205
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2002
2206
break;
2003
2207
}
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
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);
2033
2233
}
2034
2234
2035
2235
if(quit_now){
2036
2236
goto end;
2037
2237
}
2038
2238
2039
ret = init_gnutls_global(pubkey, seckey);
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2040
2240
if(ret == -1){
2041
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2242
exitcode = EX_UNAVAILABLE;
2059
2259
goto end;
2060
2260
}
2061
2261
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2263
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2264
exitcode = EX_UNAVAILABLE;
2065
2265
goto end;
2075
2275
/* Connect directly, do not use Zeroconf */
2076
2276
/* (Mainly meant for debugging) */
2077
2277
char *address = strrchr(connect_to, ':');
2278
2078
2279
if(address == NULL){
2079
2280
fprintf_plus(stderr, "No colon in address\n");
2080
2281
exitcode = EX_USAGE;
2085
2286
goto end;
2086
2287
}
2087
2288
2088
uint16_t port;
2289
in_port_t port;
2089
2290
errno = 0;
2090
2291
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2292
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2293
or tmpmax != (in_port_t)tmpmax){
2093
2294
fprintf_plus(stderr, "Bad port number\n");
2094
2295
exitcode = EX_USAGE;
2095
2296
goto end;
2096
2297
}
2097
2298
2098
2299
if(quit_now){
2099
2300
goto end;
2100
2301
}
2101
2302
2102
port = (uint16_t)tmpmax;
2303
port = (in_port_t)tmpmax;
2103
2304
*address = '\0';
2104
2305
/* Colon in address indicates IPv6 */
2105
2306
int af;
2121
2322
}
2122
2323
2123
2324
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2125
2327
if(quit_now or ret == 0){
2126
2328
break;
2127
2329
}
2129
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
2332
(int)retry_interval);
2131
2333
}
2132
sleep((int)retry_interval);
2334
sleep((unsigned int)retry_interval);
2133
2335
}
2134
2336
2135
2337
if (not quit_now){
2153
2355
config.publish_domain = 0;
2154
2356
2155
2357
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2159
2360
2160
2361
/* Free the Avahi configuration data */
2161
2362
avahi_server_config_free(&config);
2164
2365
/* Check if creating the Avahi server object succeeded */
2165
2366
if(mc.server == NULL){
2166
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2368
avahi_strerror(ret_errno));
2168
2369
exitcode = EX_UNAVAILABLE;
2169
2370
goto end;
2170
2371
}
2176
2377
/* Create the Avahi service browser */
2177
2378
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
2379
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2180
2382
if(sb == NULL){
2181
2383
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
2384
avahi_strerror(avahi_server_errno(mc.server)));
2194
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
2397
}
2196
2398
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2199
2401
if(debug){
2200
2402
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
2403
(ret == 0) ? "successfully" : "with error");
2208
2410
}
2209
2411
2210
2412
/* Cleanup things */
2413
free(mc.interfaces);
2414
2211
2415
if(sb != NULL)
2212
2416
avahi_s_service_browser_free(sb);
2213
2417
2214
2418
if(mc.server != NULL)
2215
2419
avahi_server_free(mc.server);
2216
2420
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2219
2423
2220
2424
if(gnutls_initialized){
2221
2425
gnutls_certificate_free_credentials(mc.cred);
2238
2442
}
2239
2443
}
2240
2444
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
2445
/* Re-raise priviliges */
2245
2446
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2250
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
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");
2262
2463
}
2263
2464
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2267
2468
}
2268
2469
}
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2470
2471
lower_privileges_permanently();
2472
}
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2276
2476
2277
2477
/* Removes the GPGME temp directory and all files inside */
2278
2478
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0