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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
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
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;
170
173
171
174
/* Function to use when printing errors */
172
175
void perror_plus(const char *print_text){
176
int e = errno;
173
177
fprintf(stderr, "Mandos plugin %s: ",
174
178
program_invocation_short_name);
179
errno = e;
175
180
perror(print_text);
176
181
}
177
182
203
208
}
204
209
205
210
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
208
213
int ret;
209
214
server *new_server = malloc(sizeof(server));
210
215
if(new_server == NULL){
220
225
return false;
221
226
}
222
227
/* Special case of first server */
223
if (mc.current_server == NULL){
228
if(*current_server == NULL){
224
229
new_server->next = new_server;
225
230
new_server->prev = new_server;
226
mc.current_server = new_server;
231
*current_server = new_server;
227
232
/* Place the new server last in the list */
228
233
} else {
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
231
236
new_server->prev->next = new_server;
232
mc.current_server->prev = new_server;
237
(*current_server)->prev = new_server;
233
238
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
235
240
if(ret == -1){
236
241
perror_plus("clock_gettime");
237
242
return false;
243
248
* Initialize GPGME.
244
249
*/
245
250
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
251
const char *tempdir, mandos_context *mc){
247
252
gpgme_error_t rc;
248
253
gpgme_engine_info_t engine_info;
249
254
250
251
255
/*
252
256
* Helper function to insert pub and seckey to the engine keyring.
253
257
*/
269
273
return false;
270
274
}
271
275
272
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
273
277
if(rc != GPG_ERR_NO_ERROR){
274
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
279
gpgme_strsource(rc), gpgme_strerror(rc));
319
323
}
320
324
321
325
/* Create new GPGME "context" */
322
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
323
327
if(rc != GPG_ERR_NO_ERROR){
324
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
344
*/
341
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
342
346
size_t crypto_size,
343
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
344
349
gpgme_data_t dh_crypto, dh_plain;
345
350
gpgme_error_t rc;
346
351
ssize_t ret;
372
377
373
378
/* Decrypt data from the cryptotext data buffer to the plaintext
374
379
data buffer */
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
376
381
if(rc != GPG_ERR_NO_ERROR){
377
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
383
gpgme_strsource(rc), gpgme_strerror(rc));
379
384
plaintext_length = -1;
380
385
if(debug){
381
386
gpgme_decrypt_result_t result;
382
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
383
388
if(result == NULL){
384
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
390
} else {
463
468
}
464
469
465
470
static const char * safer_gnutls_strerror(int value){
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
468
472
if(ret == NULL)
469
473
ret = "(unknown)";
470
474
return ret;
477
481
}
478
482
479
483
static int init_gnutls_global(const char *pubkeyfilename,
480
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
481
486
int ret;
482
487
483
488
if(debug){
500
505
}
501
506
502
507
/* OpenPGP credentials */
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
504
509
if(ret != GNUTLS_E_SUCCESS){
505
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
511
safer_gnutls_strerror(ret));
516
521
}
517
522
518
523
ret = gnutls_certificate_set_openpgp_key_file
519
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
520
525
GNUTLS_OPENPGP_FMT_BASE64);
521
526
if(ret != GNUTLS_E_SUCCESS){
522
527
fprintf_plus(stderr,
528
533
}
529
534
530
535
/* GnuTLS server initialization */
531
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
532
537
if(ret != GNUTLS_E_SUCCESS){
533
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
539
" initialization: %s\n",
535
540
safer_gnutls_strerror(ret));
536
541
goto globalfail;
537
542
}
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
539
544
if(ret != GNUTLS_E_SUCCESS){
540
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
546
safer_gnutls_strerror(ret));
542
547
goto globalfail;
543
548
}
544
549
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
546
551
547
552
return 0;
548
553
549
554
globalfail:
550
555
551
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
552
557
gnutls_global_deinit();
553
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
554
559
return -1;
555
560
}
556
561
557
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
558
564
int ret;
559
565
/* GnuTLS session creation */
560
566
do {
572
578
{
573
579
const char *err;
574
580
do {
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
576
582
if(quit_now){
577
583
gnutls_deinit(*session);
578
584
return -1;
589
595
590
596
do {
591
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
592
mc.cred);
598
mc->cred);
593
599
if(quit_now){
594
600
gnutls_deinit(*session);
595
601
return -1;
605
611
/* ignore client certificate if any. */
606
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
607
613
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
609
615
610
616
return 0;
611
617
}
615
621
__attribute__((unused)) const char *txt){}
616
622
617
623
/* Called when a Mandos server is found */
618
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
619
625
AvahiIfIndex if_index,
620
int af){
626
int af, mandos_context *mc){
621
627
int ret, tcp_sd = -1;
622
628
ssize_t sret;
623
629
union {
653
659
return -1;
654
660
}
655
661
656
ret = init_gnutls_session(&session);
662
ret = init_gnutls_session(&session, mc);
657
663
if(ret != 0){
658
664
return -1;
659
665
}
660
666
661
667
if(debug){
662
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
669
PRIuMAX "\n", ip, (uintmax_t)port);
664
670
}
665
671
666
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
697
703
goto mandos_end;
698
704
}
699
705
if(af == AF_INET6){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
706
to.in6.sin6_port = htons(port);
704
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
709
-Wunreachable-code*/
730
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
731
734
perror_plus("if_indextoname");
732
735
} else {
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
735
738
}
736
739
} else {
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
739
742
}
740
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
741
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
819
822
goto mandos_end;
820
823
}
821
824
822
/* Spurious warning from -Wint-to-pointer-cast */
823
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);
824
830
825
831
if(quit_now){
826
832
errno = EINTR;
931
937
if(buffer_length > 0){
932
938
ssize_t decrypted_buffer_size;
933
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
934
&decrypted_buffer);
940
&decrypted_buffer, mc);
935
941
if(decrypted_buffer_size >= 0){
936
942
937
943
written = 0;
998
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
999
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1000
1006
flags,
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
1007
void* mc){
1008
if(r == NULL){
1009
return;
1010
}
1003
1011
1004
1012
/* Called whenever a service has been resolved successfully or
1005
1013
timed out */
1014
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
1024
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
1025
avahi_strerror(avahi_server_errno
1026
(((mandos_context*)mc)->server)));
1018
1027
break;
1019
1028
1020
1029
case AVAHI_RESOLVER_FOUND:
1026
1035
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
1036
host_name, ip, (intmax_t)interface, port);
1028
1037
}
1029
int ret = start_mandos_communication(ip, port, interface,
1030
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);
1031
1042
if(ret == 0){
1032
avahi_simple_poll_quit(mc.simple_poll);
1043
avahi_simple_poll_quit(simple_poll);
1033
1044
} else {
1034
if(not add_server(ip, port, interface,
1035
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)){
1036
1048
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
1049
" list\n", name);
1038
1050
}
1051
1063
const char *domain,
1052
1064
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1053
1065
flags,
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1066
void* mc){
1067
if(b == NULL){
1068
return;
1069
}
1056
1070
1057
1071
/* Called whenever a new services becomes available on the LAN or
1058
1072
is removed from the LAN */
1066
1080
case AVAHI_BROWSER_FAILURE:
1067
1081
1068
1082
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
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);
1071
1086
return;
1072
1087
1073
1088
case AVAHI_BROWSER_NEW:
1076
1091
the callback function is called the Avahi server will free the
1077
1092
resolver for us. */
1078
1093
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
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)
1082
1098
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
1099
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
1100
avahi_strerror(avahi_server_errno
1101
(((mandos_context*)mc)->server)));
1085
1102
break;
1086
1103
1087
1104
case AVAHI_BROWSER_REMOVE:
1106
1123
signal_received = sig;
1107
1124
int old_errno = errno;
1108
1125
/* set main loop to exit */
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1126
if(simple_poll != NULL){
1127
avahi_simple_poll_quit(simple_poll);
1111
1128
}
1112
1129
errno = old_errno;
1113
1130
}
1114
1131
1115
1132
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
1133
int ret;
1134
error_t ret_errno;
1117
1135
1118
1136
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
1137
if(s < 0){
1138
ret_errno = errno;
1120
1139
perror_plus("socket");
1140
errno = ret_errno;
1121
1141
return false;
1122
1142
}
1123
1143
strcpy(ifr->ifr_name, ifname);
1124
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
1145
if(ret == -1){
1126
1146
if(debug){
1147
ret_errno = errno;
1127
1148
perror_plus("ioctl SIOCGIFFLAGS");
1149
errno = ret_errno;
1128
1150
}
1129
1151
return false;
1130
1152
}
1199
1221
}
1200
1222
1201
1223
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
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);
1242
1253
}
1243
1254
1244
1255
int notdotentries(const struct dirent *direntry){
1313
1324
return 1;
1314
1325
}
1315
1326
1316
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){
1317
1329
int ret;
1318
1330
struct timespec now;
1319
1331
struct timespec waited_time;
1320
1332
intmax_t block_time;
1321
1333
1322
1334
while(true){
1323
if(mc.current_server == NULL){
1335
if(mc->current_server == NULL){
1324
1336
if (debug){
1325
1337
fprintf_plus(stderr, "Wait until first server is found."
1326
1338
" No timeout!\n");
1340
1352
/* Calculating in ms how long time between now and server
1341
1353
who we visted longest time ago. Now - last seen. */
1342
1354
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1355
- mc->current_server->last_seen.tv_sec);
1344
1356
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1357
- mc->current_server->last_seen.tv_nsec);
1346
1358
/* total time is 10s/10,000ms.
1347
1359
Converting to s from ms by dividing by 1,000,
1348
1360
and ns to ms by dividing by 1,000,000. */
1356
1368
}
1357
1369
1358
1370
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
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);
1363
1375
if(ret == 0){
1364
avahi_simple_poll_quit(mc.simple_poll);
1376
avahi_simple_poll_quit(s);
1365
1377
return 0;
1366
1378
}
1367
1379
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1380
&mc->current_server->last_seen);
1369
1381
if(ret == -1){
1370
1382
perror_plus("clock_gettime");
1371
1383
return -1;
1372
1384
}
1373
mc.current_server = mc.current_server->next;
1385
mc->current_server = mc->current_server->next;
1374
1386
block_time = 0; /* Call avahi to find new Mandos
1375
1387
servers, but don't block */
1376
1388
}
1385
1397
}
1386
1398
}
1387
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
1388
1452
bool run_network_hooks(const char *mode, const char *interface,
1389
1453
const float delay){
1390
1454
struct dirent **direntries;
1393
1457
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
1458
alphasort);
1395
1459
if(numhooks == -1){
1396
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
}
1397
1468
} else {
1398
1469
int devnull = open("/dev/null", O_RDONLY);
1399
1470
for(int i = 0; i < numhooks; i++){
1412
1483
if(hook_pid == 0){
1413
1484
/* Child */
1414
1485
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1486
raise_privileges_permanently();
1426
1487
/* Set group */
1427
1488
errno = 0;
1428
1489
ret = setgid(0);
1448
1509
perror_plus("setenv");
1449
1510
_exit(EX_OSERR);
1450
1511
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1512
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1452
1513
if(ret == -1){
1453
1514
perror_plus("setenv");
1454
1515
_exit(EX_OSERR);
1471
1532
_exit(EX_OSERR);
1472
1533
}
1473
1534
free(delaystring);
1535
if(connect_to != NULL){
1536
ret = setenv("CONNECT", connect_to, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
}
1474
1542
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
1543
perror_plus("execl");
1476
1544
_exit(EXIT_FAILURE);
1514
1582
return true;
1515
1583
}
1516
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
1517
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 };
1518
1762
AvahiSServiceBrowser *sb = NULL;
1519
int error;
1763
error_t ret_errno;
1520
1764
int ret;
1521
1765
intmax_t tmpmax;
1522
1766
char *tmp;
1523
1767
int exitcode = EXIT_SUCCESS;
1524
const char *interface = "";
1525
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
1528
uid_t uid;
1529
gid_t gid;
1768
char *interfaces_to_take_down = NULL;
1769
size_t interfaces_to_take_down_size = 0;
1530
1770
char tempdir[] = "/tmp/mandosXXXXXX";
1531
1771
bool tempdir_created = false;
1532
1772
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1533
1773
const char *seckey = PATHDIR "/" SECKEY;
1534
1774
const char *pubkey = PATHDIR "/" PUBKEY;
1775
char *interfaces_hooks = NULL;
1776
size_t interfaces_hooks_size = 0;
1535
1777
1536
1778
bool gnutls_initialized = false;
1537
1779
bool gpgme_initialized = false;
1599
1841
.group = 2 },
1600
1842
{ .name = "retry", .key = 132,
1601
1843
.arg = "SECONDS",
1602
.doc = "Retry interval used when denied by the mandos server",
1844
.doc = "Retry interval used when denied by the Mandos server",
1603
1845
.group = 2 },
1604
1846
{ .name = "network-hook-dir", .key = 133,
1605
1847
.arg = "DIR",
1628
1870
connect_to = arg;
1629
1871
break;
1630
1872
case 'i': /* --interface */
1631
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
}
1632
1878
break;
1633
1879
case 's': /* --seckey */
1634
1880
seckey = arg;
1712
1958
<http://bugs.debian.org/633582> */
1713
1959
1714
1960
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
} else {
1961
if(raise_privileges() == 0){
1720
1962
struct stat st;
1721
1963
1722
1964
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1770
2012
}
1771
2013
}
1772
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
1773
2031
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
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
}
1776
2049
}
1777
2050
1778
2051
if(not debug){
1779
2052
avahi_set_log_function(empty_log);
1780
2053
}
1781
2054
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
1814
2055
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1815
2056
from the signal handler */
1816
2057
/* Initialize the pseudo-RNG for Avahi */
1817
2058
srand((unsigned int) time(NULL));
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
2059
simple_poll = avahi_simple_poll_new();
2060
if(simple_poll == NULL){
1820
2061
fprintf_plus(stderr,
1821
2062
"Avahi: Failed to create simple poll object.\n");
1822
2063
exitcode = EX_UNAVAILABLE;
1886
2127
}
1887
2128
}
1888
2129
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
1909
#ifdef __linux__
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1917
}
1918
#endif /* __linux__ */
1919
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
goto end;
1939
}
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
1956
if(ret == -1){
1957
perror_plus("seteuid");
1958
}
1959
goto end;
1960
}
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
1974
}
1975
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
goto end;
1984
}
1985
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
1993
break;
1994
}
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1999
}
2000
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
2007
}
2008
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
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");
2023
2192
}
2024
2193
}
2025
2194
2027
2196
goto end;
2028
2197
}
2029
2198
2030
ret = init_gnutls_global(pubkey, seckey);
2199
ret = init_gnutls_global(pubkey, seckey, &mc);
2031
2200
if(ret == -1){
2032
2201
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2202
exitcode = EX_UNAVAILABLE;
2050
2219
goto end;
2051
2220
}
2052
2221
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2222
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2054
2223
fprintf_plus(stderr, "init_gpgme failed\n");
2055
2224
exitcode = EX_UNAVAILABLE;
2056
2225
goto end;
2066
2235
/* Connect directly, do not use Zeroconf */
2067
2236
/* (Mainly meant for debugging) */
2068
2237
char *address = strrchr(connect_to, ':');
2238
2069
2239
if(address == NULL){
2070
2240
fprintf_plus(stderr, "No colon in address\n");
2071
2241
exitcode = EX_USAGE;
2076
2246
goto end;
2077
2247
}
2078
2248
2079
uint16_t port;
2249
in_port_t port;
2080
2250
errno = 0;
2081
2251
tmpmax = strtoimax(address+1, &tmp, 10);
2082
2252
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2083
or tmpmax != (uint16_t)tmpmax){
2253
or tmpmax != (in_port_t)tmpmax){
2084
2254
fprintf_plus(stderr, "Bad port number\n");
2085
2255
exitcode = EX_USAGE;
2086
2256
goto end;
2090
2260
goto end;
2091
2261
}
2092
2262
2093
port = (uint16_t)tmpmax;
2263
port = (in_port_t)tmpmax;
2094
2264
*address = '\0';
2095
2265
/* Colon in address indicates IPv6 */
2096
2266
int af;
2112
2282
}
2113
2283
2114
2284
while(not quit_now){
2115
ret = start_mandos_communication(address, port, if_index, af);
2285
ret = start_mandos_communication(address, port, if_index, af,
2286
&mc);
2116
2287
if(quit_now or ret == 0){
2117
2288
break;
2118
2289
}
2144
2315
config.publish_domain = 0;
2145
2316
2146
2317
/* Allocate a new server */
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2318
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2319
&config, NULL, NULL, &ret_errno);
2150
2320
2151
2321
/* Free the Avahi configuration data */
2152
2322
avahi_server_config_free(&config);
2155
2325
/* Check if creating the Avahi server object succeeded */
2156
2326
if(mc.server == NULL){
2157
2327
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
2328
avahi_strerror(ret_errno));
2159
2329
exitcode = EX_UNAVAILABLE;
2160
2330
goto end;
2161
2331
}
2167
2337
/* Create the Avahi service browser */
2168
2338
sb = avahi_s_service_browser_new(mc.server, if_index,
2169
2339
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2170
NULL, 0, browse_callback, NULL);
2340
NULL, 0, browse_callback,
2341
(void *)&mc);
2171
2342
if(sb == NULL){
2172
2343
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
2344
avahi_strerror(avahi_server_errno(mc.server)));
2185
2356
fprintf_plus(stderr, "Starting Avahi loop search\n");
2186
2357
}
2187
2358
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2359
ret = avahi_loop_with_timeout(simple_poll,
2360
(int)(retry_interval * 1000), &mc);
2190
2361
if(debug){
2191
2362
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
2363
(ret == 0) ? "successfully" : "with error");
2205
2376
if(mc.server != NULL)
2206
2377
avahi_server_free(mc.server);
2207
2378
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2379
if(simple_poll != NULL)
2380
avahi_simple_poll_free(simple_poll);
2210
2381
2211
2382
if(gnutls_initialized){
2212
2383
gnutls_certificate_free_credentials(mc.cred);
2229
2400
}
2230
2401
}
2231
2402
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
2403
/* Re-raise priviliges */
2236
2404
{
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
2241
}
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
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");
2253
2421
}
2254
2422
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
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");
2258
2426
}
2259
2427
}
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2428
2429
lower_privileges_permanently();
2430
}
2431
2432
free(interfaces_to_take_down);
2433
free(interfaces_hooks);
2267
2434
2268
2435
/* Removes the GPGME temp directory and all files inside */
2269
2436
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0