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- Committer: Teddy Hogeborn
- Date: 2012-06-17 02:30:59 UTC
- Revision ID: teddy@recompile.se-20120617023059-em4nfnxg1tsn64xj
* plugins.d/mandos-client (start_mandos_communication): Bug fix; skip
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
- 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;
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(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
663
/* Check if the interface is one of the interfaces we are using */
664
bool match = false;
665
{
666
char *interface = NULL;
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
669
if(if_nametoindex(interface) == (unsigned int)if_index){
670
match = true;
671
break;
672
}
673
}
674
}
675
if(not match){
676
if(debug){
677
char interface[IF_NAMESIZE];
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
679
perror_plus("if_indextoname");
680
} else {
681
fprintf_plus(stderr, "Skipping server on non-used interface"
682
" \"%s\"\n",
683
if_indextoname((unsigned int)if_index,
684
interface));
685
}
686
}
687
return -1;
688
}
689
}
690
691
ret = init_gnutls_session(&session, mc);
659
692
if(ret != 0){
660
693
return -1;
661
694
}
662
695
663
696
if(debug){
664
697
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
698
PRIuMAX "\n", ip, (uintmax_t)port);
666
699
}
667
700
668
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
699
732
goto mandos_end;
700
733
}
701
734
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
735
to.in6.sin6_port = htons(port);
706
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
738
-Wunreachable-code*/
732
762
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
763
perror_plus("if_indextoname");
734
764
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
765
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
766
"\n", ip, interface, (uintmax_t)port);
737
767
}
738
768
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
769
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
770
ip, (uintmax_t)port);
741
771
}
742
772
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
773
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
821
851
goto mandos_end;
822
852
}
823
853
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
854
/* This casting via intptr_t is to eliminate warning about casting
855
an int to a pointer type. This is exactly how the GnuTLS Guile
856
function "set-session-transport-fd!" does it. */
857
gnutls_transport_set_ptr(session,
858
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
859
827
860
if(quit_now){
828
861
errno = EINTR;
933
966
if(buffer_length > 0){
934
967
ssize_t decrypted_buffer_size;
935
968
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
969
&decrypted_buffer, mc);
937
970
if(decrypted_buffer_size >= 0){
938
971
939
972
written = 0;
1000
1033
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1034
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1035
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1036
void* mc){
1037
if(r == NULL){
1038
return;
1039
}
1005
1040
1006
1041
/* Called whenever a service has been resolved successfully or
1007
1042
timed out */
1016
1051
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1052
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1053
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1054
avahi_strerror(avahi_server_errno
1055
(((mandos_context*)mc)->server)));
1020
1056
break;
1021
1057
1022
1058
case AVAHI_RESOLVER_FOUND:
1028
1064
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1065
host_name, ip, (intmax_t)interface, port);
1030
1066
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1067
int ret = start_mandos_communication(ip, (in_port_t)port,
1068
interface,
1069
avahi_proto_to_af(proto),
1070
mc);
1033
1071
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1072
avahi_simple_poll_quit(simple_poll);
1035
1073
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1074
if(not add_server(ip, (in_port_t)port, interface,
1075
avahi_proto_to_af(proto),
1076
&((mandos_context*)mc)->current_server)){
1038
1077
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1078
" list\n", name);
1040
1079
}
1053
1092
const char *domain,
1054
1093
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1094
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1095
void* mc){
1096
if(b == NULL){
1097
return;
1098
}
1058
1099
1059
1100
/* Called whenever a new services becomes available on the LAN or
1060
1101
is removed from the LAN */
1068
1109
case AVAHI_BROWSER_FAILURE:
1069
1110
1070
1111
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1112
avahi_strerror(avahi_server_errno
1113
(((mandos_context*)mc)->server)));
1114
avahi_simple_poll_quit(simple_poll);
1073
1115
return;
1074
1116
1075
1117
case AVAHI_BROWSER_NEW:
1078
1120
the callback function is called the Avahi server will free the
1079
1121
resolver for us. */
1080
1122
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1123
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1124
interface, protocol, name, type,
1125
domain, protocol, 0,
1126
resolve_callback, mc) == NULL)
1084
1127
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1128
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1129
avahi_strerror(avahi_server_errno
1130
(((mandos_context*)mc)->server)));
1087
1131
break;
1088
1132
1089
1133
case AVAHI_BROWSER_REMOVE:
1108
1152
signal_received = sig;
1109
1153
int old_errno = errno;
1110
1154
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1155
if(simple_poll != NULL){
1156
avahi_simple_poll_quit(simple_poll);
1113
1157
}
1114
1158
errno = old_errno;
1115
1159
}
1116
1160
1117
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1162
int ret;
1163
error_t ret_errno;
1119
1164
1120
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1166
if(s < 0){
1167
ret_errno = errno;
1122
1168
perror_plus("socket");
1169
errno = ret_errno;
1123
1170
return false;
1124
1171
}
1125
1172
strcpy(ifr->ifr_name, ifname);
1126
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1174
if(ret == -1){
1128
1175
if(debug){
1176
ret_errno = errno;
1129
1177
perror_plus("ioctl SIOCGIFFLAGS");
1178
errno = ret_errno;
1130
1179
}
1131
1180
return false;
1132
1181
}
1201
1250
}
1202
1251
1203
1252
/*
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;
1253
* This function determines if a network interface is up.
1254
*/
1255
bool interface_is_up(const char *interface){
1256
struct ifreq ifr;
1257
if(not get_flags(interface, &ifr)){
1258
if(debug){
1259
fprintf_plus(stderr, "Failed to get flags for interface "
1260
"\"%s\"\n", interface);
1261
}
1262
return false;
1263
}
1264
1265
return (bool)(ifr.ifr_flags & IFF_UP);
1266
}
1267
1268
/*
1269
* This function determines if a network interface is running
1270
*/
1271
bool interface_is_running(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1244
1282
}
1245
1283
1246
1284
int notdotentries(const struct dirent *direntry){
1315
1353
return 1;
1316
1354
}
1317
1355
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1357
mandos_context *mc){
1319
1358
int ret;
1320
1359
struct timespec now;
1321
1360
struct timespec waited_time;
1322
1361
intmax_t block_time;
1323
1362
1324
1363
while(true){
1325
if(mc.current_server == NULL){
1364
if(mc->current_server == NULL){
1326
1365
if (debug){
1327
1366
fprintf_plus(stderr, "Wait until first server is found."
1328
1367
" No timeout!\n");
1342
1381
/* Calculating in ms how long time between now and server
1343
1382
who we visted longest time ago. Now - last seen. */
1344
1383
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1384
- mc->current_server->last_seen.tv_sec);
1346
1385
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1386
- mc->current_server->last_seen.tv_nsec);
1348
1387
/* total time is 10s/10,000ms.
1349
1388
Converting to s from ms by dividing by 1,000,
1350
1389
and ns to ms by dividing by 1,000,000. */
1358
1397
}
1359
1398
1360
1399
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);
1400
ret = start_mandos_communication(mc->current_server->ip,
1401
mc->current_server->port,
1402
mc->current_server->if_index,
1403
mc->current_server->af, mc);
1365
1404
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1405
avahi_simple_poll_quit(s);
1367
1406
return 0;
1368
1407
}
1369
1408
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1409
&mc->current_server->last_seen);
1371
1410
if(ret == -1){
1372
1411
perror_plus("clock_gettime");
1373
1412
return -1;
1374
1413
}
1375
mc.current_server = mc.current_server->next;
1414
mc->current_server = mc->current_server->next;
1376
1415
block_time = 0; /* Call avahi to find new Mandos
1377
1416
servers, but don't block */
1378
1417
}
1387
1426
}
1388
1427
}
1389
1428
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1390
1481
bool run_network_hooks(const char *mode, const char *interface,
1391
1482
const float delay){
1392
1483
struct dirent **direntries;
1395
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
1487
alphasort);
1397
1488
if(numhooks == -1){
1398
perror_plus("scandir");
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
1496
}
1399
1497
} else {
1400
1498
int devnull = open("/dev/null", O_RDONLY);
1401
1499
for(int i = 0; i < numhooks; i++){
1414
1512
if(hook_pid == 0){
1415
1513
/* Child */
1416
1514
/* 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
}
1515
raise_privileges_permanently();
1428
1516
/* Set group */
1429
1517
errno = 0;
1430
1518
ret = setgid(0);
1523
1611
return true;
1524
1612
}
1525
1613
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
1620
struct ifreq network;
1621
unsigned int if_index = if_nametoindex(interface);
1622
if(if_index == 0){
1623
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1624
errno = old_errno;
1625
return ENXIO;
1626
}
1627
1628
if(quit_now){
1629
errno = old_errno;
1630
return EINTR;
1631
}
1632
1633
if(not interface_is_up(interface)){
1634
if(not get_flags(interface, &network) and debug){
1635
ret_errno = errno;
1636
fprintf_plus(stderr, "Failed to get flags for interface "
1637
"\"%s\"\n", interface);
1638
return ret_errno;
1639
}
1640
network.ifr_flags |= IFF_UP;
1641
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
1644
ret_errno = errno;
1645
perror_plus("socket");
1646
errno = old_errno;
1647
return ret_errno;
1648
}
1649
1650
if(quit_now){
1651
close(sd);
1652
errno = old_errno;
1653
return EINTR;
1654
}
1655
1656
if(debug){
1657
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1658
interface);
1659
}
1660
1661
/* Raise priviliges */
1662
raise_privileges();
1663
1664
#ifdef __linux__
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
1672
}
1673
#endif /* __linux__ */
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
1676
#ifdef __linux__
1677
if(restore_loglevel){
1678
ret_linux = klogctl(7, NULL, 0);
1679
if(ret_linux == -1){
1680
perror_plus("klogctl");
1681
}
1682
}
1683
#endif /* __linux__ */
1684
1685
/* Lower privileges */
1686
lower_privileges();
1687
1688
/* Close the socket */
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1690
if(ret == -1){
1691
perror_plus("close");
1692
}
1693
1694
if(ret_setflags == -1){
1695
errno = ret_errno;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
errno = old_errno;
1698
return ret_errno;
1699
}
1700
} else if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1702
interface);
1703
}
1704
1705
/* Sleep checking until interface is running.
1706
Check every 0.25s, up to total time of delay */
1707
for(int i=0; i < delay * 4; i++){
1708
if(interface_is_running(interface)){
1709
break;
1710
}
1711
struct timespec sleeptime = { .tv_nsec = 250000000 };
1712
ret = nanosleep(&sleeptime, NULL);
1713
if(ret == -1 and errno != EINTR){
1714
perror_plus("nanosleep");
1715
}
1716
}
1717
1718
errno = old_errno;
1719
return 0;
1720
}
1721
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
1727
struct ifreq network;
1728
unsigned int if_index = if_nametoindex(interface);
1729
if(if_index == 0){
1730
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1731
errno = old_errno;
1732
return ENXIO;
1733
}
1734
if(interface_is_up(interface)){
1735
if(not get_flags(interface, &network) and debug){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
return ret_errno;
1740
}
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1742
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
1745
ret_errno = errno;
1746
perror_plus("socket");
1747
errno = old_errno;
1748
return ret_errno;
1749
}
1750
1751
if(debug){
1752
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1753
interface);
1754
}
1755
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
1764
1765
/* Close the socket */
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1767
if(ret == -1){
1768
perror_plus("close");
1769
}
1770
1771
if(ret_setflags == -1){
1772
errno = ret_errno;
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1774
errno = old_errno;
1775
return ret_errno;
1776
}
1777
} else if(debug){
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1779
interface);
1780
}
1781
1782
errno = old_errno;
1783
return 0;
1784
}
1785
1526
1786
int main(int argc, char *argv[]){
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
1527
1791
AvahiSServiceBrowser *sb = NULL;
1528
int error;
1792
error_t ret_errno;
1529
1793
int ret;
1530
1794
intmax_t tmpmax;
1531
1795
char *tmp;
1532
1796
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;
1797
char *interfaces_to_take_down = NULL;
1798
size_t interfaces_to_take_down_size = 0;
1539
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1540
1800
bool tempdir_created = false;
1541
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
1802
const char *seckey = PATHDIR "/" SECKEY;
1543
1803
const char *pubkey = PATHDIR "/" PUBKEY;
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
1544
1806
1545
1807
bool gnutls_initialized = false;
1546
1808
bool gpgme_initialized = false;
1637
1899
connect_to = arg;
1638
1900
break;
1639
1901
case 'i': /* --interface */
1640
interface = arg;
1902
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1903
arg, (int)',');
1904
if(ret_errno != 0){
1905
argp_error(state, "%s", strerror(ret_errno));
1906
}
1641
1907
break;
1642
1908
case 's': /* --seckey */
1643
1909
seckey = arg;
1721
1987
<http://bugs.debian.org/633582> */
1722
1988
1723
1989
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1990
if(raise_privileges() == 0){
1729
1991
struct stat st;
1730
1992
1731
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1771
2033
}
1772
2034
1773
2035
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2036
lower_privileges();
2037
}
2038
}
2039
2040
/* Remove invalid interface names (except "none") */
2041
{
2042
char *interface = NULL;
2043
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2044
interface))){
2045
if(strcmp(interface, "none") != 0
2046
and if_nametoindex(interface) == 0){
2047
if(interface[0] != '\0'){
2048
fprintf_plus(stderr, "Not using nonexisting interface"
2049
" \"%s\"\n", interface);
2050
}
2051
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2052
interface = NULL;
1778
2053
}
1779
2054
}
1780
2055
}
1781
2056
1782
2057
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2058
{
2059
if(mc.interfaces != NULL){
2060
interfaces_hooks = malloc(mc.interfaces_size);
2061
if(interfaces_hooks == NULL){
2062
perror_plus("malloc");
2063
goto end;
2064
}
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
2069
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2072
goto end;
2073
}
1785
2074
}
1786
2075
1787
2076
if(not debug){
1788
2077
avahi_set_log_function(empty_log);
1789
2078
}
1790
2079
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
2080
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2081
from the signal handler */
1825
2082
/* Initialize the pseudo-RNG for Avahi */
1826
2083
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2084
simple_poll = avahi_simple_poll_new();
2085
if(simple_poll == NULL){
1829
2086
fprintf_plus(stderr,
1830
2087
"Avahi: Failed to create simple poll object.\n");
1831
2088
exitcode = EX_UNAVAILABLE;
1895
2152
}
1896
2153
}
1897
2154
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");
2155
/* If no interfaces were specified, make a list */
2156
if(mc.interfaces == NULL){
2157
struct dirent **direntries;
2158
/* Look for any good interfaces */
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2160
alphasort);
2161
if(ret >= 1){
2162
/* Add all found interfaces to interfaces list */
2163
for(int i = 0; i < ret; ++i){
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2165
direntries[i]->d_name);
2166
if(ret_errno != 0){
2167
perror_plus("argz_add");
2168
continue;
2169
}
2170
if(debug){
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2172
direntries[i]->d_name);
2173
}
2174
}
2175
free(direntries);
2176
} else {
2177
free(direntries);
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2179
exitcode = EXIT_FAILURE;
2180
goto end;
2181
}
2182
}
2183
2184
/* Bring up interfaces which are down */
2185
{
2186
char *interface = NULL;
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2188
interface))){
2189
/* If interface name is "none", stop bringing up interfaces.
2190
Also remove all instances of "none" from the list */
2191
if(strcmp(interface, "none") == 0){
2192
argz_delete(&mc.interfaces, &mc.interfaces_size,
2193
interface);
2194
interface = NULL;
2195
while((interface = argz_next(mc.interfaces,
2196
mc.interfaces_size, interface))){
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
1983
2201
}
1984
2202
}
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
2203
break;
2003
2204
}
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
}
2205
bool interface_was_up = interface_is_up(interface);
2206
ret = bring_up_interface(interface, delay);
2207
if(not interface_was_up){
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2211
} else {
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2215
}
2216
}
2217
}
2218
if(debug and (interfaces_to_take_down == NULL)){
2219
fprintf_plus(stderr, "No interfaces were brought up\n");
2220
}
2221
}
2222
2223
/* If we only got one interface, explicitly use only that one */
2224
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2225
if(debug){
2226
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2227
mc.interfaces);
2228
}
2229
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2033
2230
}
2034
2231
2035
2232
if(quit_now){
2036
2233
goto end;
2037
2234
}
2038
2235
2039
ret = init_gnutls_global(pubkey, seckey);
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
2040
2237
if(ret == -1){
2041
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2239
exitcode = EX_UNAVAILABLE;
2059
2256
goto end;
2060
2257
}
2061
2258
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2259
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2260
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2261
exitcode = EX_UNAVAILABLE;
2065
2262
goto end;
2075
2272
/* Connect directly, do not use Zeroconf */
2076
2273
/* (Mainly meant for debugging) */
2077
2274
char *address = strrchr(connect_to, ':');
2275
2078
2276
if(address == NULL){
2079
2277
fprintf_plus(stderr, "No colon in address\n");
2080
2278
exitcode = EX_USAGE;
2085
2283
goto end;
2086
2284
}
2087
2285
2088
uint16_t port;
2286
in_port_t port;
2089
2287
errno = 0;
2090
2288
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2289
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2290
or tmpmax != (in_port_t)tmpmax){
2093
2291
fprintf_plus(stderr, "Bad port number\n");
2094
2292
exitcode = EX_USAGE;
2095
2293
goto end;
2096
2294
}
2097
2295
2098
2296
if(quit_now){
2099
2297
goto end;
2100
2298
}
2101
2299
2102
port = (uint16_t)tmpmax;
2300
port = (in_port_t)tmpmax;
2103
2301
*address = '\0';
2104
2302
/* Colon in address indicates IPv6 */
2105
2303
int af;
2121
2319
}
2122
2320
2123
2321
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2322
ret = start_mandos_communication(address, port, if_index, af,
2323
&mc);
2125
2324
if(quit_now or ret == 0){
2126
2325
break;
2127
2326
}
2153
2352
config.publish_domain = 0;
2154
2353
2155
2354
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2356
&config, NULL, NULL, &ret_errno);
2159
2357
2160
2358
/* Free the Avahi configuration data */
2161
2359
avahi_server_config_free(&config);
2164
2362
/* Check if creating the Avahi server object succeeded */
2165
2363
if(mc.server == NULL){
2166
2364
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2365
avahi_strerror(ret_errno));
2168
2366
exitcode = EX_UNAVAILABLE;
2169
2367
goto end;
2170
2368
}
2176
2374
/* Create the Avahi service browser */
2177
2375
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
2376
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2377
NULL, 0, browse_callback,
2378
(void *)&mc);
2180
2379
if(sb == NULL){
2181
2380
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
2381
avahi_strerror(avahi_server_errno(mc.server)));
2194
2393
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
2394
}
2196
2395
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2396
ret = avahi_loop_with_timeout(simple_poll,
2397
(int)(retry_interval * 1000), &mc);
2199
2398
if(debug){
2200
2399
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
2400
(ret == 0) ? "successfully" : "with error");
2208
2407
}
2209
2408
2210
2409
/* Cleanup things */
2410
free(mc.interfaces);
2411
2211
2412
if(sb != NULL)
2212
2413
avahi_s_service_browser_free(sb);
2213
2414
2214
2415
if(mc.server != NULL)
2215
2416
avahi_server_free(mc.server);
2216
2417
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2418
if(simple_poll != NULL)
2419
avahi_simple_poll_free(simple_poll);
2219
2420
2220
2421
if(gnutls_initialized){
2221
2422
gnutls_certificate_free_credentials(mc.cred);
2238
2439
}
2239
2440
}
2240
2441
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
2442
/* Re-raise priviliges */
2245
2443
{
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");
2444
raise_privileges();
2445
2446
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2449
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
2262
2460
}
2263
2461
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2267
2465
}
2268
2466
}
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2467
2468
lower_privileges_permanently();
2469
}
2470
2471
free(interfaces_to_take_down);
2472
free(interfaces_hooks);
2276
2473
2277
2474
/* Removes the GPGME temp directory and all files inside */
2278
2475
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0