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- Committer: Teddy Hogeborn
- Date: 2012-06-16 23:39:10 UTC
- Revision ID: teddy@recompile.se-20120616233910-jxxxriq608qa6o8z
* plugins.d/mandos-client (mandos_context): New "interfaces" and
"interfaces_size" members.
(main): Removed "interfaces" and "interfaces_size" variabled; all
users changed.
"interfaces_size" members.
(main): Removed "interfaces" and "interfaces_size" variabled; all
users changed.
- 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
ret = init_gnutls_session(&session, mc);
659
663
if(ret != 0){
660
664
return -1;
661
665
}
662
666
663
667
if(debug){
664
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
669
PRIuMAX "\n", ip, (uintmax_t)port);
666
670
}
667
671
668
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
699
703
goto mandos_end;
700
704
}
701
705
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
to.in6.sin6_port = htons(port);
706
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
709
-Wunreachable-code*/
732
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
734
perror_plus("if_indextoname");
734
735
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
737
738
}
738
739
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
741
742
}
742
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
821
822
goto mandos_end;
822
823
}
823
824
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
830
827
831
if(quit_now){
828
832
errno = EINTR;
933
937
if(buffer_length > 0){
934
938
ssize_t decrypted_buffer_size;
935
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
940
&decrypted_buffer, mc);
937
941
if(decrypted_buffer_size >= 0){
938
942
939
943
written = 0;
1000
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1006
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1007
void* mc){
1008
if(r == NULL){
1009
return;
1010
}
1005
1011
1006
1012
/* Called whenever a service has been resolved successfully or
1007
1013
timed out */
1016
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1024
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1025
avahi_strerror(avahi_server_errno
1026
(((mandos_context*)mc)->server)));
1020
1027
break;
1021
1028
1022
1029
case AVAHI_RESOLVER_FOUND:
1028
1035
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1036
host_name, ip, (intmax_t)interface, port);
1030
1037
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1038
int ret = start_mandos_communication(ip, (in_port_t)port,
1039
interface,
1040
avahi_proto_to_af(proto),
1041
mc);
1033
1042
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1043
avahi_simple_poll_quit(simple_poll);
1035
1044
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1045
if(not add_server(ip, (in_port_t)port, interface,
1046
avahi_proto_to_af(proto),
1047
&((mandos_context*)mc)->current_server)){
1038
1048
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1049
" list\n", name);
1040
1050
}
1053
1063
const char *domain,
1054
1064
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1065
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1066
void* mc){
1067
if(b == NULL){
1068
return;
1069
}
1058
1070
1059
1071
/* Called whenever a new services becomes available on the LAN or
1060
1072
is removed from the LAN */
1068
1080
case AVAHI_BROWSER_FAILURE:
1069
1081
1070
1082
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1083
avahi_strerror(avahi_server_errno
1084
(((mandos_context*)mc)->server)));
1085
avahi_simple_poll_quit(simple_poll);
1073
1086
return;
1074
1087
1075
1088
case AVAHI_BROWSER_NEW:
1078
1091
the callback function is called the Avahi server will free the
1079
1092
resolver for us. */
1080
1093
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1094
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1095
interface, protocol, name, type,
1096
domain, protocol, 0,
1097
resolve_callback, mc) == NULL)
1084
1098
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1099
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1100
avahi_strerror(avahi_server_errno
1101
(((mandos_context*)mc)->server)));
1087
1102
break;
1088
1103
1089
1104
case AVAHI_BROWSER_REMOVE:
1108
1123
signal_received = sig;
1109
1124
int old_errno = errno;
1110
1125
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1126
if(simple_poll != NULL){
1127
avahi_simple_poll_quit(simple_poll);
1113
1128
}
1114
1129
errno = old_errno;
1115
1130
}
1116
1131
1117
1132
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1133
int ret;
1134
error_t ret_errno;
1119
1135
1120
1136
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1137
if(s < 0){
1138
ret_errno = errno;
1122
1139
perror_plus("socket");
1140
errno = ret_errno;
1123
1141
return false;
1124
1142
}
1125
1143
strcpy(ifr->ifr_name, ifname);
1126
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1145
if(ret == -1){
1128
1146
if(debug){
1147
ret_errno = errno;
1129
1148
perror_plus("ioctl SIOCGIFFLAGS");
1149
errno = ret_errno;
1130
1150
}
1131
1151
return false;
1132
1152
}
1201
1221
}
1202
1222
1203
1223
/*
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;
1224
* This function determines if a network interface is up.
1225
*/
1226
bool interface_is_up(const char *interface){
1227
struct ifreq ifr;
1228
if(not get_flags(interface, &ifr)){
1229
if(debug){
1230
fprintf_plus(stderr, "Failed to get flags for interface "
1231
"\"%s\"\n", interface);
1232
}
1233
return false;
1234
}
1235
1236
return (bool)(ifr.ifr_flags & IFF_UP);
1237
}
1238
1239
/*
1240
* This function determines if a network interface is running
1241
*/
1242
bool interface_is_running(const char *interface){
1243
struct ifreq ifr;
1244
if(not get_flags(interface, &ifr)){
1245
if(debug){
1246
fprintf_plus(stderr, "Failed to get flags for interface "
1247
"\"%s\"\n", interface);
1248
}
1249
return false;
1250
}
1251
1252
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1244
1253
}
1245
1254
1246
1255
int notdotentries(const struct dirent *direntry){
1315
1324
return 1;
1316
1325
}
1317
1326
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1327
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1328
mandos_context *mc){
1319
1329
int ret;
1320
1330
struct timespec now;
1321
1331
struct timespec waited_time;
1322
1332
intmax_t block_time;
1323
1333
1324
1334
while(true){
1325
if(mc.current_server == NULL){
1335
if(mc->current_server == NULL){
1326
1336
if (debug){
1327
1337
fprintf_plus(stderr, "Wait until first server is found."
1328
1338
" No timeout!\n");
1342
1352
/* Calculating in ms how long time between now and server
1343
1353
who we visted longest time ago. Now - last seen. */
1344
1354
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1355
- mc->current_server->last_seen.tv_sec);
1346
1356
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1357
- mc->current_server->last_seen.tv_nsec);
1348
1358
/* total time is 10s/10,000ms.
1349
1359
Converting to s from ms by dividing by 1,000,
1350
1360
and ns to ms by dividing by 1,000,000. */
1358
1368
}
1359
1369
1360
1370
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);
1371
ret = start_mandos_communication(mc->current_server->ip,
1372
mc->current_server->port,
1373
mc->current_server->if_index,
1374
mc->current_server->af, mc);
1365
1375
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1376
avahi_simple_poll_quit(s);
1367
1377
return 0;
1368
1378
}
1369
1379
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1380
&mc->current_server->last_seen);
1371
1381
if(ret == -1){
1372
1382
perror_plus("clock_gettime");
1373
1383
return -1;
1374
1384
}
1375
mc.current_server = mc.current_server->next;
1385
mc->current_server = mc->current_server->next;
1376
1386
block_time = 0; /* Call avahi to find new Mandos
1377
1387
servers, but don't block */
1378
1388
}
1387
1397
}
1388
1398
}
1389
1399
1400
/* Set effective uid to 0, return errno */
1401
error_t raise_privileges(void){
1402
error_t old_errno = errno;
1403
error_t ret_errno = 0;
1404
if(seteuid(0) == -1){
1405
ret_errno = errno;
1406
perror_plus("seteuid");
1407
}
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
1412
/* Set effective and real user ID to 0. Return errno. */
1413
error_t raise_privileges_permanently(void){
1414
error_t old_errno = errno;
1415
error_t ret_errno = raise_privileges();
1416
if(ret_errno != 0){
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
if(setuid(0) == -1){
1421
ret_errno = errno;
1422
perror_plus("seteuid");
1423
}
1424
errno = old_errno;
1425
return ret_errno;
1426
}
1427
1428
/* Set effective user ID to unprivileged saved user ID */
1429
error_t lower_privileges(void){
1430
error_t old_errno = errno;
1431
error_t ret_errno = 0;
1432
if(seteuid(uid) == -1){
1433
ret_errno = errno;
1434
perror_plus("seteuid");
1435
}
1436
errno = old_errno;
1437
return ret_errno;
1438
}
1439
1440
/* Lower privileges permanently */
1441
error_t lower_privileges_permanently(void){
1442
error_t old_errno = errno;
1443
error_t ret_errno = 0;
1444
if(setuid(uid) == -1){
1445
ret_errno = errno;
1446
perror_plus("setuid");
1447
}
1448
errno = old_errno;
1449
return ret_errno;
1450
}
1451
1390
1452
bool run_network_hooks(const char *mode, const char *interface,
1391
1453
const float delay){
1392
1454
struct dirent **direntries;
1395
1457
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
1458
alphasort);
1397
1459
if(numhooks == -1){
1398
perror_plus("scandir");
1460
if(errno == ENOENT){
1461
if(debug){
1462
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1463
" found\n", hookdir);
1464
}
1465
} else {
1466
perror_plus("scandir");
1467
}
1399
1468
} else {
1400
1469
int devnull = open("/dev/null", O_RDONLY);
1401
1470
for(int i = 0; i < numhooks; i++){
1414
1483
if(hook_pid == 0){
1415
1484
/* Child */
1416
1485
/* 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
}
1486
raise_privileges_permanently();
1428
1487
/* Set group */
1429
1488
errno = 0;
1430
1489
ret = setgid(0);
1523
1582
return true;
1524
1583
}
1525
1584
1585
error_t bring_up_interface(const char *const interface,
1586
const float delay){
1587
int sd = -1;
1588
error_t old_errno = errno;
1589
error_t ret_errno = 0;
1590
int ret, ret_setflags;
1591
struct ifreq network;
1592
unsigned int if_index = if_nametoindex(interface);
1593
if(if_index == 0){
1594
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1595
errno = old_errno;
1596
return ENXIO;
1597
}
1598
1599
if(quit_now){
1600
errno = old_errno;
1601
return EINTR;
1602
}
1603
1604
if(not interface_is_up(interface)){
1605
if(not get_flags(interface, &network) and debug){
1606
ret_errno = errno;
1607
fprintf_plus(stderr, "Failed to get flags for interface "
1608
"\"%s\"\n", interface);
1609
return ret_errno;
1610
}
1611
network.ifr_flags |= IFF_UP;
1612
1613
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1614
if(sd < 0){
1615
ret_errno = errno;
1616
perror_plus("socket");
1617
errno = old_errno;
1618
return ret_errno;
1619
}
1620
1621
if(quit_now){
1622
close(sd);
1623
errno = old_errno;
1624
return EINTR;
1625
}
1626
1627
if(debug){
1628
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1629
interface);
1630
}
1631
1632
/* Raise priviliges */
1633
raise_privileges();
1634
1635
#ifdef __linux__
1636
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1637
messages about the network interface to mess up the prompt */
1638
int ret_linux = klogctl(8, NULL, 5);
1639
bool restore_loglevel = true;
1640
if(ret_linux == -1){
1641
restore_loglevel = false;
1642
perror_plus("klogctl");
1643
}
1644
#endif /* __linux__ */
1645
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1646
ret_errno = errno;
1647
#ifdef __linux__
1648
if(restore_loglevel){
1649
ret_linux = klogctl(7, NULL, 0);
1650
if(ret_linux == -1){
1651
perror_plus("klogctl");
1652
}
1653
}
1654
#endif /* __linux__ */
1655
1656
/* Lower privileges */
1657
lower_privileges();
1658
1659
/* Close the socket */
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror_plus("close");
1663
}
1664
1665
if(ret_setflags == -1){
1666
errno = ret_errno;
1667
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1668
errno = old_errno;
1669
return ret_errno;
1670
}
1671
} else if(debug){
1672
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1673
interface);
1674
}
1675
1676
/* Sleep checking until interface is running.
1677
Check every 0.25s, up to total time of delay */
1678
for(int i=0; i < delay * 4; i++){
1679
if(interface_is_running(interface)){
1680
break;
1681
}
1682
struct timespec sleeptime = { .tv_nsec = 250000000 };
1683
ret = nanosleep(&sleeptime, NULL);
1684
if(ret == -1 and errno != EINTR){
1685
perror_plus("nanosleep");
1686
}
1687
}
1688
1689
errno = old_errno;
1690
return 0;
1691
}
1692
1693
error_t take_down_interface(const char *const interface){
1694
int sd = -1;
1695
error_t old_errno = errno;
1696
error_t ret_errno = 0;
1697
int ret, ret_setflags;
1698
struct ifreq network;
1699
unsigned int if_index = if_nametoindex(interface);
1700
if(if_index == 0){
1701
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1702
errno = old_errno;
1703
return ENXIO;
1704
}
1705
if(interface_is_up(interface)){
1706
if(not get_flags(interface, &network) and debug){
1707
ret_errno = errno;
1708
fprintf_plus(stderr, "Failed to get flags for interface "
1709
"\"%s\"\n", interface);
1710
return ret_errno;
1711
}
1712
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1713
1714
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1715
if(sd < 0){
1716
ret_errno = errno;
1717
perror_plus("socket");
1718
errno = old_errno;
1719
return ret_errno;
1720
}
1721
1722
if(debug){
1723
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1724
interface);
1725
}
1726
1727
/* Raise priviliges */
1728
raise_privileges();
1729
1730
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1731
ret_errno = errno;
1732
1733
/* Lower privileges */
1734
lower_privileges();
1735
1736
/* Close the socket */
1737
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1738
if(ret == -1){
1739
perror_plus("close");
1740
}
1741
1742
if(ret_setflags == -1){
1743
errno = ret_errno;
1744
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1745
errno = old_errno;
1746
return ret_errno;
1747
}
1748
} else if(debug){
1749
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1750
interface);
1751
}
1752
1753
errno = old_errno;
1754
return 0;
1755
}
1756
1526
1757
int main(int argc, char *argv[]){
1758
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1759
.priority = "SECURE256:!CTYPE-X.509:"
1760
"+CTYPE-OPENPGP", .current_server = NULL,
1761
.interfaces = NULL, .interfaces_size = 0 };
1527
1762
AvahiSServiceBrowser *sb = NULL;
1528
int error;
1763
error_t ret_errno;
1529
1764
int ret;
1530
1765
intmax_t tmpmax;
1531
1766
char *tmp;
1532
1767
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;
1768
char *interfaces_to_take_down = NULL;
1769
size_t interfaces_to_take_down_size = 0;
1539
1770
char tempdir[] = "/tmp/mandosXXXXXX";
1540
1771
bool tempdir_created = false;
1541
1772
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
1773
const char *seckey = PATHDIR "/" SECKEY;
1543
1774
const char *pubkey = PATHDIR "/" PUBKEY;
1775
char *interfaces_hooks = NULL;
1776
size_t interfaces_hooks_size = 0;
1544
1777
1545
1778
bool gnutls_initialized = false;
1546
1779
bool gpgme_initialized = false;
1637
1870
connect_to = arg;
1638
1871
break;
1639
1872
case 'i': /* --interface */
1640
interface = arg;
1873
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1874
arg, (int)',');
1875
if(ret_errno != 0){
1876
argp_error(state, "%s", strerror(ret_errno));
1877
}
1641
1878
break;
1642
1879
case 's': /* --seckey */
1643
1880
seckey = arg;
1721
1958
<http://bugs.debian.org/633582> */
1722
1959
1723
1960
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1961
if(raise_privileges() == 0){
1729
1962
struct stat st;
1730
1963
1731
1964
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1779
2012
}
1780
2013
}
1781
2014
2015
/* Remove empty interface names */
2016
{
2017
char *interface = NULL;
2018
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2019
interface))){
2020
if(if_nametoindex(interface) == 0){
2021
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2022
fprintf_plus(stderr, "Not using nonexisting interface"
2023
" \"%s\"\n", interface);
2024
}
2025
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2026
interface = NULL;
2027
}
2028
}
2029
}
2030
1782
2031
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2032
{
2033
2034
if(mc.interfaces != NULL){
2035
interfaces_hooks = malloc(mc.interfaces_size);
2036
if(interfaces_hooks == NULL){
2037
perror_plus("malloc");
2038
goto end;
2039
}
2040
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2041
interfaces_hooks_size = mc.interfaces_size;
2042
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2043
(int)',');
2044
}
2045
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2046
interfaces_hooks : "", delay)){
2047
goto end;
2048
}
1785
2049
}
1786
2050
1787
2051
if(not debug){
1788
2052
avahi_set_log_function(empty_log);
1789
2053
}
1790
2054
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
2055
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2056
from the signal handler */
1825
2057
/* Initialize the pseudo-RNG for Avahi */
1826
2058
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2059
simple_poll = avahi_simple_poll_new();
2060
if(simple_poll == NULL){
1829
2061
fprintf_plus(stderr,
1830
2062
"Avahi: Failed to create simple poll object.\n");
1831
2063
exitcode = EX_UNAVAILABLE;
1895
2127
}
1896
2128
}
1897
2129
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");
1983
}
1984
}
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
break;
2003
}
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");
2130
/* If no interfaces were specified, make a list */
2131
if(mc.interfaces == NULL){
2132
struct dirent **direntries;
2133
/* Look for any good interfaces */
2134
ret = scandir(sys_class_net, &direntries, good_interface,
2135
alphasort);
2136
if(ret >= 1){
2137
/* Add all found interfaces to interfaces list */
2138
for(int i = 0; i < ret; ++i){
2139
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2140
direntries[i]->d_name);
2141
if(ret_errno != 0){
2142
perror_plus("argz_add");
2143
continue;
2144
}
2145
if(debug){
2146
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2147
direntries[i]->d_name);
2148
}
2149
}
2150
free(direntries);
2151
} else {
2152
free(direntries);
2153
fprintf_plus(stderr, "Could not find a network interface\n");
2154
exitcode = EXIT_FAILURE;
2155
goto end;
2156
}
2157
}
2158
2159
/* If we only got one interface, explicitly use only that one */
2160
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2161
if(debug){
2162
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2163
mc.interfaces);
2164
}
2165
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2166
}
2167
2168
/* Bring up interfaces which are down */
2169
if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1
2170
and strcmp(mc.interfaces, "none") == 0)){
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
bool interface_was_up = interface_is_up(interface);
2175
ret = bring_up_interface(interface, delay);
2176
if(not interface_was_up){
2177
if(ret != 0){
2178
errno = ret;
2179
perror_plus("Failed to bring up interface");
2180
} else {
2181
ret_errno = argz_add(&interfaces_to_take_down,
2182
&interfaces_to_take_down_size,
2183
interface);
2184
}
2185
}
2186
}
2187
free(mc.interfaces);
2188
mc.interfaces = NULL;
2189
mc.interfaces_size = 0;
2190
if(debug and (interfaces_to_take_down == NULL)){
2191
fprintf_plus(stderr, "No interfaces were brought up\n");
2032
2192
}
2033
2193
}
2034
2194
2036
2196
goto end;
2037
2197
}
2038
2198
2039
ret = init_gnutls_global(pubkey, seckey);
2199
ret = init_gnutls_global(pubkey, seckey, &mc);
2040
2200
if(ret == -1){
2041
2201
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2202
exitcode = EX_UNAVAILABLE;
2059
2219
goto end;
2060
2220
}
2061
2221
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2222
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2223
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2224
exitcode = EX_UNAVAILABLE;
2065
2225
goto end;
2075
2235
/* Connect directly, do not use Zeroconf */
2076
2236
/* (Mainly meant for debugging) */
2077
2237
char *address = strrchr(connect_to, ':');
2238
2078
2239
if(address == NULL){
2079
2240
fprintf_plus(stderr, "No colon in address\n");
2080
2241
exitcode = EX_USAGE;
2085
2246
goto end;
2086
2247
}
2087
2248
2088
uint16_t port;
2249
in_port_t port;
2089
2250
errno = 0;
2090
2251
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2252
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2253
or tmpmax != (in_port_t)tmpmax){
2093
2254
fprintf_plus(stderr, "Bad port number\n");
2094
2255
exitcode = EX_USAGE;
2095
2256
goto end;
2099
2260
goto end;
2100
2261
}
2101
2262
2102
port = (uint16_t)tmpmax;
2263
port = (in_port_t)tmpmax;
2103
2264
*address = '\0';
2104
2265
/* Colon in address indicates IPv6 */
2105
2266
int af;
2121
2282
}
2122
2283
2123
2284
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2285
ret = start_mandos_communication(address, port, if_index, af,
2286
&mc);
2125
2287
if(quit_now or ret == 0){
2126
2288
break;
2127
2289
}
2153
2315
config.publish_domain = 0;
2154
2316
2155
2317
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2318
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2319
&config, NULL, NULL, &ret_errno);
2159
2320
2160
2321
/* Free the Avahi configuration data */
2161
2322
avahi_server_config_free(&config);
2164
2325
/* Check if creating the Avahi server object succeeded */
2165
2326
if(mc.server == NULL){
2166
2327
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2328
avahi_strerror(ret_errno));
2168
2329
exitcode = EX_UNAVAILABLE;
2169
2330
goto end;
2170
2331
}
2176
2337
/* Create the Avahi service browser */
2177
2338
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
2339
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2340
NULL, 0, browse_callback,
2341
(void *)&mc);
2180
2342
if(sb == NULL){
2181
2343
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
2344
avahi_strerror(avahi_server_errno(mc.server)));
2194
2356
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
2357
}
2196
2358
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2359
ret = avahi_loop_with_timeout(simple_poll,
2360
(int)(retry_interval * 1000), &mc);
2199
2361
if(debug){
2200
2362
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
2363
(ret == 0) ? "successfully" : "with error");
2214
2376
if(mc.server != NULL)
2215
2377
avahi_server_free(mc.server);
2216
2378
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2379
if(simple_poll != NULL)
2380
avahi_simple_poll_free(simple_poll);
2219
2381
2220
2382
if(gnutls_initialized){
2221
2383
gnutls_certificate_free_credentials(mc.cred);
2238
2400
}
2239
2401
}
2240
2402
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
2403
/* Re-raise priviliges */
2245
2404
{
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");
2405
raise_privileges();
2406
2407
/* Run network hooks */
2408
run_network_hooks("stop", interfaces_hooks != NULL ?
2409
interfaces_hooks : "", delay);
2410
2411
/* Take down the network interfaces which were brought up */
2412
{
2413
char *interface = NULL;
2414
while((interface=argz_next(interfaces_to_take_down,
2415
interfaces_to_take_down_size,
2416
interface))){
2417
ret_errno = take_down_interface(interface);
2418
if(ret_errno != 0){
2419
errno = ret_errno;
2420
perror_plus("Failed to take down interface");
2262
2421
}
2263
2422
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2423
if(debug and (interfaces_to_take_down == NULL)){
2424
fprintf_plus(stderr, "No interfaces needed to be taken"
2425
" down\n");
2267
2426
}
2268
2427
}
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2428
2429
lower_privileges_permanently();
2430
}
2431
2432
free(interfaces_to_take_down);
2433
free(interfaces_hooks);
2276
2434
2277
2435
/* Removes the GPGME temp directory and all files inside */
2278
2436
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0