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- Committer: Teddy Hogeborn
- Date: 2011-12-01 21:01:21 UTC
- mto: (505.2.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111201210121-6zpzlxdschiv0gzc
Added sample OpenVPN network hook.
* network-hooks.d/openvpn: New.
* network-hooks.d/openvpn.conf: - '' -
* network-hooks.d/openvpn: New.
* network-hooks.d/openvpn.conf: - '' -
- files removed:
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_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() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
87
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
89
WEXITSTATUS(), WTERMSIG() */
89
90
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
91
95
92
#ifdef __linux__
96
93
#include <sys/klog.h> /* klogctl() */
138
135
static const char sys_class_net[] = "/sys/class/net";
139
136
char *connect_to = NULL;
140
137
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
138
144
139
/* Doubly linked list that need to be circularly linked when used */
145
140
typedef struct server{
146
141
const char *ip;
147
in_port_t port;
142
uint16_t port;
148
143
AvahiIfIndex if_index;
149
144
int af;
150
145
struct timespec last_seen;
154
149
155
150
/* Used for passing in values through the Avahi callback functions */
156
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
157
153
AvahiServer *server;
158
154
gnutls_certificate_credentials_t cred;
159
155
unsigned int dh_bits;
161
157
const char *priority;
162
158
gpgme_ctx_t ctx;
163
159
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
160
} mandos_context;
167
161
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
170
167
171
168
sig_atomic_t quit_now = 0;
172
169
int signal_received = 0;
173
170
174
171
/* Function to use when printing errors */
175
172
void perror_plus(const char *print_text){
176
int e = errno;
177
173
fprintf(stderr, "Mandos plugin %s: ",
178
174
program_invocation_short_name);
179
errno = e;
180
175
perror(print_text);
181
176
}
182
177
183
__attribute__((format (gnu_printf, 2, 3)))
184
178
int fprintf_plus(FILE *stream, const char *format, ...){
185
179
va_list ap;
186
180
va_start (ap, format);
187
181
188
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
183
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
185
}
192
186
193
187
/*
208
202
}
209
203
210
204
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
213
207
int ret;
214
208
server *new_server = malloc(sizeof(server));
215
209
if(new_server == NULL){
216
210
perror_plus("malloc");
217
return false;
211
return -1;
218
212
}
219
213
*new_server = (server){ .ip = strdup(ip),
220
214
.port = port,
222
216
.af = af };
223
217
if(new_server->ip == NULL){
224
218
perror_plus("strdup");
225
return false;
219
return -1;
226
220
}
227
221
/* Special case of first server */
228
if(*current_server == NULL){
222
if (mc.current_server == NULL){
229
223
new_server->next = new_server;
230
224
new_server->prev = new_server;
231
*current_server = new_server;
225
mc.current_server = new_server;
232
226
/* Place the new server last in the list */
233
227
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
236
230
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
231
mc.current_server->prev = new_server;
238
232
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
234
if(ret == -1){
241
235
perror_plus("clock_gettime");
242
return false;
236
return -1;
243
237
}
244
return true;
238
return 0;
245
239
}
246
240
247
241
/*
248
242
* Initialize GPGME.
249
243
*/
250
244
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
245
const char *tempdir){
252
246
gpgme_error_t rc;
253
247
gpgme_engine_info_t engine_info;
254
248
249
255
250
/*
256
251
* Helper function to insert pub and seckey to the engine keyring.
257
252
*/
273
268
return false;
274
269
}
275
270
276
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
277
272
if(rc != GPG_ERR_NO_ERROR){
278
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
274
gpgme_strsource(rc), gpgme_strerror(rc));
323
318
}
324
319
325
320
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
327
322
if(rc != GPG_ERR_NO_ERROR){
328
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
339
*/
345
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
341
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
342
char **plaintext){
349
343
gpgme_data_t dh_crypto, dh_plain;
350
344
gpgme_error_t rc;
351
345
ssize_t ret;
377
371
378
372
/* Decrypt data from the cryptotext data buffer to the plaintext
379
373
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
375
if(rc != GPG_ERR_NO_ERROR){
382
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
377
gpgme_strsource(rc), gpgme_strerror(rc));
384
378
plaintext_length = -1;
385
379
if(debug){
386
380
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
388
382
if(result == NULL){
389
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
384
} else {
468
462
}
469
463
470
464
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
472
467
if(ret == NULL)
473
468
ret = "(unknown)";
474
469
return ret;
481
476
}
482
477
483
478
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
479
const char *seckeyfilename){
486
480
int ret;
487
481
488
482
if(debug){
505
499
}
506
500
507
501
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
509
503
if(ret != GNUTLS_E_SUCCESS){
510
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
505
safer_gnutls_strerror(ret));
521
515
}
522
516
523
517
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
525
519
GNUTLS_OPENPGP_FMT_BASE64);
526
520
if(ret != GNUTLS_E_SUCCESS){
527
521
fprintf_plus(stderr,
533
527
}
534
528
535
529
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
537
531
if(ret != GNUTLS_E_SUCCESS){
538
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
533
" initialization: %s\n",
540
534
safer_gnutls_strerror(ret));
541
535
goto globalfail;
542
536
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
538
if(ret != GNUTLS_E_SUCCESS){
545
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
540
safer_gnutls_strerror(ret));
547
541
goto globalfail;
548
542
}
549
543
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
545
552
546
return 0;
553
547
554
548
globalfail:
555
549
556
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
557
551
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
559
553
return -1;
560
554
}
561
555
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
564
557
int ret;
565
558
/* GnuTLS session creation */
566
559
do {
578
571
{
579
572
const char *err;
580
573
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
575
if(quit_now){
583
576
gnutls_deinit(*session);
584
577
return -1;
595
588
596
589
do {
597
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
591
mc.cred);
599
592
if(quit_now){
600
593
gnutls_deinit(*session);
601
594
return -1;
611
604
/* ignore client certificate if any. */
612
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
606
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
608
616
609
return 0;
617
610
}
621
614
__attribute__((unused)) const char *txt){}
622
615
623
616
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
625
618
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
619
int af){
627
620
int ret, tcp_sd = -1;
628
621
ssize_t sret;
629
622
union {
659
652
return -1;
660
653
}
661
654
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
655
ret = init_gnutls_session(&session);
695
656
if(ret != 0){
696
657
return -1;
697
658
}
698
659
699
660
if(debug){
700
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
702
663
}
703
664
704
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
735
696
goto mandos_end;
736
697
}
737
698
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
743
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
748
706
if(if_index == AVAHI_IF_UNSPEC){
749
707
fprintf_plus(stderr, "An IPv6 link-local address is"
750
708
" incomplete without a network interface\n");
755
713
to.in6.sin6_scope_id = (uint32_t)if_index;
756
714
}
757
715
} else {
758
to.in.sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
759
719
}
760
720
761
721
if(quit_now){
769
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
770
730
perror_plus("if_indextoname");
771
731
} else {
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
774
734
}
775
735
} else {
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
778
738
}
779
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
858
818
goto mandos_end;
859
819
}
860
820
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
866
823
867
824
if(quit_now){
868
825
errno = EINTR;
973
930
if(buffer_length > 0){
974
931
ssize_t decrypted_buffer_size;
975
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
933
&decrypted_buffer);
977
934
if(decrypted_buffer_size >= 0){
978
935
979
936
written = 0;
1040
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1042
999
flags,
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1047
1002
1048
1003
/* Called whenever a service has been resolved successfully or
1049
1004
timed out */
1058
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
1015
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1063
1017
break;
1064
1018
1065
1019
case AVAHI_RESOLVER_FOUND:
1071
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
1026
host_name, ip, (intmax_t)interface, port);
1073
1027
}
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1078
1030
if(ret == 0){
1079
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1080
1032
} else {
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1087
1035
}
1088
1036
}
1089
1037
}
1099
1047
const char *domain,
1100
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1101
1049
flags,
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1106
1052
1107
1053
/* Called whenever a new services becomes available on the LAN or
1108
1054
is removed from the LAN */
1116
1062
case AVAHI_BROWSER_FAILURE:
1117
1063
1118
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1122
1067
return;
1123
1068
1124
1069
case AVAHI_BROWSER_NEW:
1127
1072
the callback function is called the Avahi server will free the
1128
1073
resolver for us. */
1129
1074
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1134
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
1079
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1138
1081
break;
1139
1082
1140
1083
case AVAHI_BROWSER_REMOVE:
1159
1102
signal_received = sig;
1160
1103
int old_errno = errno;
1161
1104
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1164
1107
}
1165
1108
errno = old_errno;
1166
1109
}
1167
1110
1168
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
1112
int ret;
1170
error_t ret_errno;
1171
1113
1172
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
1115
if(s < 0){
1174
ret_errno = errno;
1175
1116
perror_plus("socket");
1176
errno = ret_errno;
1177
1117
return false;
1178
1118
}
1179
1119
strcpy(ifr->ifr_name, ifname);
1180
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
1121
if(ret == -1){
1182
1122
if(debug){
1183
ret_errno = errno;
1184
1123
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
1124
}
1187
1125
return false;
1188
1126
}
1257
1195
}
1258
1196
1259
1197
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1289
1238
}
1290
1239
1291
1240
int notdotentries(const struct dirent *direntry){
1360
1309
return 1;
1361
1310
}
1362
1311
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1365
1313
int ret;
1366
1314
struct timespec now;
1367
1315
struct timespec waited_time;
1368
1316
intmax_t block_time;
1369
1317
1370
1318
while(true){
1371
if(mc->current_server == NULL){
1319
if(mc.current_server == NULL){
1372
1320
if (debug){
1373
1321
fprintf_plus(stderr, "Wait until first server is found."
1374
1322
" No timeout!\n");
1388
1336
/* Calculating in ms how long time between now and server
1389
1337
who we visted longest time ago. Now - last seen. */
1390
1338
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1392
1340
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1394
1342
/* total time is 10s/10,000ms.
1395
1343
Converting to s from ms by dividing by 1,000,
1396
1344
and ns to ms by dividing by 1,000,000. */
1404
1352
}
1405
1353
1406
1354
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1411
1359
if(ret == 0){
1412
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1413
1361
return 0;
1414
1362
}
1415
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1417
1365
if(ret == -1){
1418
1366
perror_plus("clock_gettime");
1419
1367
return -1;
1420
1368
}
1421
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1422
1370
block_time = 0; /* Call avahi to find new Mandos
1423
1371
servers, but don't block */
1424
1372
}
1433
1381
}
1434
1382
}
1435
1383
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
1384
bool run_network_hooks(const char *mode, const char *interface,
1489
1385
const float delay){
1490
1386
struct dirent **direntries;
1493
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
1390
alphasort);
1495
1391
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1392
perror_plus("scandir");
1504
1393
} else {
1505
1394
int devnull = open("/dev/null", O_RDONLY);
1506
1395
for(int i = 0; i < numhooks; i++){
1519
1408
if(hook_pid == 0){
1520
1409
/* Child */
1521
1410
/* Raise privileges */
1522
raise_privileges_permanently();
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1523
1422
/* Set group */
1524
1423
errno = 0;
1525
1424
ret = setgid(0);
1545
1444
perror_plus("setenv");
1546
1445
_exit(EX_OSERR);
1547
1446
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1549
1448
if(ret == -1){
1550
1449
perror_plus("setenv");
1551
1450
_exit(EX_OSERR);
1568
1467
_exit(EX_OSERR);
1569
1468
}
1570
1469
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1582
1472
} else {
1583
1473
int status;
1584
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1618
1508
return true;
1619
1509
}
1620
1510
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1793
1511
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1798
1512
AvahiSServiceBrowser *sb = NULL;
1799
error_t ret_errno;
1513
int error;
1800
1514
int ret;
1801
1515
intmax_t tmpmax;
1802
1516
char *tmp;
1803
1517
int exitcode = EXIT_SUCCESS;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1806
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1807
1525
bool tempdir_created = false;
1808
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
1527
const char *seckey = PATHDIR "/" SECKEY;
1810
1528
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1813
1529
1814
1530
bool gnutls_initialized = false;
1815
1531
bool gpgme_initialized = false;
1877
1593
.group = 2 },
1878
1594
{ .name = "retry", .key = 132,
1879
1595
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1596
.doc = "Retry interval used when denied by the mandos server",
1881
1597
.group = 2 },
1882
1598
{ .name = "network-hook-dir", .key = 133,
1883
1599
.arg = "DIR",
1906
1622
connect_to = arg;
1907
1623
break;
1908
1624
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1625
interface = arg;
1914
1626
break;
1915
1627
case 's': /* --seckey */
1916
1628
seckey = arg;
1959
1671
argp_state_help(state, state->out_stream,
1960
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1962
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
1677
exit(argp_err_exit_status);
1964
1678
break;
1994
1708
<http://bugs.debian.org/633582> */
1995
1709
1996
1710
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
1998
1716
struct stat st;
1999
1717
2000
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2040
1758
}
2041
1759
2042
1760
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2060
1765
}
2061
1766
}
2062
1767
}
2063
1768
2064
1769
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2081
1772
}
2082
1773
2083
1774
if(not debug){
2084
1775
avahi_set_log_function(empty_log);
2085
1776
}
2086
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
2087
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1811
from the signal handler */
2089
1812
/* Initialize the pseudo-RNG for Avahi */
2090
1813
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2093
1816
fprintf_plus(stderr,
2094
1817
"Avahi: Failed to create simple poll object.\n");
2095
1818
exitcode = EX_UNAVAILABLE;
2159
1882
}
2160
1883
}
2161
1884
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2208
1970
}
2209
1971
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
2210
1989
break;
2211
1990
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2237
2020
}
2238
2021
2239
2022
if(quit_now){
2240
2023
goto end;
2241
2024
}
2242
2025
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
2026
ret = init_gnutls_global(pubkey, seckey);
2244
2027
if(ret == -1){
2245
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2246
2029
exitcode = EX_UNAVAILABLE;
2263
2046
goto end;
2264
2047
}
2265
2048
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2267
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2268
2051
exitcode = EX_UNAVAILABLE;
2269
2052
goto end;
2279
2062
/* Connect directly, do not use Zeroconf */
2280
2063
/* (Mainly meant for debugging) */
2281
2064
char *address = strrchr(connect_to, ':');
2282
2283
2065
if(address == NULL){
2284
2066
fprintf_plus(stderr, "No colon in address\n");
2285
2067
exitcode = EX_USAGE;
2290
2072
goto end;
2291
2073
}
2292
2074
2293
in_port_t port;
2075
uint16_t port;
2294
2076
errno = 0;
2295
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2296
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2297
or tmpmax != (in_port_t)tmpmax){
2079
or tmpmax != (uint16_t)tmpmax){
2298
2080
fprintf_plus(stderr, "Bad port number\n");
2299
2081
exitcode = EX_USAGE;
2300
2082
goto end;
2301
2083
}
2302
2084
2303
2085
if(quit_now){
2304
2086
goto end;
2305
2087
}
2306
2088
2307
port = (in_port_t)tmpmax;
2089
port = (uint16_t)tmpmax;
2308
2090
*address = '\0';
2309
2091
/* Colon in address indicates IPv6 */
2310
2092
int af;
2326
2108
}
2327
2109
2328
2110
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
2111
ret = start_mandos_communication(address, port, if_index, af);
2331
2112
if(quit_now or ret == 0){
2332
2113
break;
2333
2114
}
2335
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
2117
(int)retry_interval);
2337
2118
}
2338
sleep((unsigned int)retry_interval);
2119
sleep((int)retry_interval);
2339
2120
}
2340
2121
2341
2122
if (not quit_now){
2359
2140
config.publish_domain = 0;
2360
2141
2361
2142
/* Allocate a new server */
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2364
2146
2365
2147
/* Free the Avahi configuration data */
2366
2148
avahi_server_config_free(&config);
2369
2151
/* Check if creating the Avahi server object succeeded */
2370
2152
if(mc.server == NULL){
2371
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
2154
avahi_strerror(error));
2373
2155
exitcode = EX_UNAVAILABLE;
2374
2156
goto end;
2375
2157
}
2381
2163
/* Create the Avahi service browser */
2382
2164
sb = avahi_s_service_browser_new(mc.server, if_index,
2383
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
2166
NULL, 0, browse_callback, NULL);
2386
2167
if(sb == NULL){
2387
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
2169
avahi_strerror(avahi_server_errno(mc.server)));
2400
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2401
2182
}
2402
2183
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2405
2186
if(debug){
2406
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
2188
(ret == 0) ? "successfully" : "with error");
2414
2195
}
2415
2196
2416
2197
/* Cleanup things */
2417
free(mc.interfaces);
2418
2419
2198
if(sb != NULL)
2420
2199
avahi_s_service_browser_free(sb);
2421
2200
2422
2201
if(mc.server != NULL)
2423
2202
avahi_server_free(mc.server);
2424
2203
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2427
2206
2428
2207
if(gnutls_initialized){
2429
2208
gnutls_certificate_free_credentials(mc.cred);
2446
2225
}
2447
2226
}
2448
2227
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2449
2231
/* Re-raise priviliges */
2450
2232
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2237
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2467
2249
}
2468
2250
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2472
2254
}
2473
2255
}
2474
2475
lower_privileges_permanently();
2476
}
2477
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2480
2263
2481
2264
/* Removes the GPGME temp directory and all files inside */
2482
2265
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0