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- Committer: teddy at bsnet
- Date: 2011-12-24 23:07:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224230717-yd3c0532w0kaviuc
* plugins.d/mandos-client.c (fprintf_plus): Check format string.
(run_network_hooks): Check for execl() failure.
(run_network_hooks): Check for execl() failure.
- 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
187
182
188
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
184
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
186
}
192
187
193
188
/*
208
203
}
209
204
210
205
/* 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){
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
213
208
int ret;
214
209
server *new_server = malloc(sizeof(server));
215
210
if(new_server == NULL){
225
220
return false;
226
221
}
227
222
/* Special case of first server */
228
if(*current_server == NULL){
223
if (mc.current_server == NULL){
229
224
new_server->next = new_server;
230
225
new_server->prev = new_server;
231
*current_server = new_server;
226
mc.current_server = new_server;
232
227
/* Place the new server last in the list */
233
228
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
236
231
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
232
mc.current_server->prev = new_server;
238
233
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
235
if(ret == -1){
241
236
perror_plus("clock_gettime");
242
237
return false;
248
243
* Initialize GPGME.
249
244
*/
250
245
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
246
const char *tempdir){
252
247
gpgme_error_t rc;
253
248
gpgme_engine_info_t engine_info;
254
249
250
255
251
/*
256
252
* Helper function to insert pub and seckey to the engine keyring.
257
253
*/
273
269
return false;
274
270
}
275
271
276
rc = gpgme_op_import(mc->ctx, pgp_data);
272
rc = gpgme_op_import(mc.ctx, pgp_data);
277
273
if(rc != GPG_ERR_NO_ERROR){
278
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
275
gpgme_strsource(rc), gpgme_strerror(rc));
323
319
}
324
320
325
321
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
322
rc = gpgme_new(&(mc.ctx));
327
323
if(rc != GPG_ERR_NO_ERROR){
328
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
340
*/
345
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
342
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
343
char **plaintext){
349
344
gpgme_data_t dh_crypto, dh_plain;
350
345
gpgme_error_t rc;
351
346
ssize_t ret;
377
372
378
373
/* Decrypt data from the cryptotext data buffer to the plaintext
379
374
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
376
if(rc != GPG_ERR_NO_ERROR){
382
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
378
gpgme_strsource(rc), gpgme_strerror(rc));
384
379
plaintext_length = -1;
385
380
if(debug){
386
381
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
382
result = gpgme_op_decrypt_result(mc.ctx);
388
383
if(result == NULL){
389
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
385
} else {
468
463
}
469
464
470
465
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
472
468
if(ret == NULL)
473
469
ret = "(unknown)";
474
470
return ret;
481
477
}
482
478
483
479
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
480
const char *seckeyfilename){
486
481
int ret;
487
482
488
483
if(debug){
505
500
}
506
501
507
502
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
509
504
if(ret != GNUTLS_E_SUCCESS){
510
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
506
safer_gnutls_strerror(ret));
521
516
}
522
517
523
518
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
519
(mc.cred, pubkeyfilename, seckeyfilename,
525
520
GNUTLS_OPENPGP_FMT_BASE64);
526
521
if(ret != GNUTLS_E_SUCCESS){
527
522
fprintf_plus(stderr,
533
528
}
534
529
535
530
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
531
ret = gnutls_dh_params_init(&mc.dh_params);
537
532
if(ret != GNUTLS_E_SUCCESS){
538
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
534
" initialization: %s\n",
540
535
safer_gnutls_strerror(ret));
541
536
goto globalfail;
542
537
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
539
if(ret != GNUTLS_E_SUCCESS){
545
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
541
safer_gnutls_strerror(ret));
547
542
goto globalfail;
548
543
}
549
544
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
546
552
547
return 0;
553
548
554
549
globalfail:
555
550
556
gnutls_certificate_free_credentials(mc->cred);
551
gnutls_certificate_free_credentials(mc.cred);
557
552
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
553
gnutls_dh_params_deinit(mc.dh_params);
559
554
return -1;
560
555
}
561
556
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
557
static int init_gnutls_session(gnutls_session_t *session){
564
558
int ret;
565
559
/* GnuTLS session creation */
566
560
do {
578
572
{
579
573
const char *err;
580
574
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
576
if(quit_now){
583
577
gnutls_deinit(*session);
584
578
return -1;
595
589
596
590
do {
597
591
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
592
mc.cred);
599
593
if(quit_now){
600
594
gnutls_deinit(*session);
601
595
return -1;
611
605
/* ignore client certificate if any. */
612
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
607
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
609
616
610
return 0;
617
611
}
621
615
__attribute__((unused)) const char *txt){}
622
616
623
617
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
618
static int start_mandos_communication(const char *ip, uint16_t port,
625
619
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
620
int af){
627
621
int ret, tcp_sd = -1;
628
622
ssize_t sret;
629
623
union {
659
653
return -1;
660
654
}
661
655
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);
656
ret = init_gnutls_session(&session);
695
657
if(ret != 0){
696
658
return -1;
697
659
}
698
660
699
661
if(debug){
700
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
663
PRIu16 "\n", ip, port);
702
664
}
703
665
704
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
735
697
goto mandos_end;
736
698
}
737
699
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
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
743
704
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
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
748
707
if(if_index == AVAHI_IF_UNSPEC){
749
708
fprintf_plus(stderr, "An IPv6 link-local address is"
750
709
" incomplete without a network interface\n");
755
714
to.in6.sin6_scope_id = (uint32_t)if_index;
756
715
}
757
716
} else {
758
to.in.sin_port = htons(port);
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
759
720
}
760
721
761
722
if(quit_now){
769
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
770
731
perror_plus("if_indextoname");
771
732
} else {
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
774
735
}
775
736
} else {
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
778
739
}
779
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
858
819
goto mandos_end;
859
820
}
860
821
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);
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
866
824
867
825
if(quit_now){
868
826
errno = EINTR;
973
931
if(buffer_length > 0){
974
932
ssize_t decrypted_buffer_size;
975
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
934
&decrypted_buffer);
977
935
if(decrypted_buffer_size >= 0){
978
936
979
937
written = 0;
1040
998
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
999
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1042
1000
flags,
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
1047
1003
1048
1004
/* Called whenever a service has been resolved successfully or
1049
1005
timed out */
1058
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
1016
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
1017
avahi_strerror(avahi_server_errno(mc.server)));
1063
1018
break;
1064
1019
1065
1020
case AVAHI_RESOLVER_FOUND:
1071
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
1027
host_name, ip, (intmax_t)interface, port);
1073
1028
}
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1078
1031
if(ret == 0){
1079
avahi_simple_poll_quit(simple_poll);
1032
avahi_simple_poll_quit(mc.simple_poll);
1080
1033
} else {
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1084
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
1037
" list\n", name);
1086
1038
}
1099
1051
const char *domain,
1100
1052
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1101
1053
flags,
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1106
1056
1107
1057
/* Called whenever a new services becomes available on the LAN or
1108
1058
is removed from the LAN */
1116
1066
case AVAHI_BROWSER_FAILURE:
1117
1067
1118
1068
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);
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
1122
1071
return;
1123
1072
1124
1073
case AVAHI_BROWSER_NEW:
1127
1076
the callback function is called the Avahi server will free the
1128
1077
resolver for us. */
1129
1078
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)
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1134
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
1083
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1084
avahi_strerror(avahi_server_errno(mc.server)));
1138
1085
break;
1139
1086
1140
1087
case AVAHI_BROWSER_REMOVE:
1159
1106
signal_received = sig;
1160
1107
int old_errno = errno;
1161
1108
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1164
1111
}
1165
1112
errno = old_errno;
1166
1113
}
1167
1114
1168
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
1116
int ret;
1170
error_t ret_errno;
1171
1117
1172
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
1119
if(s < 0){
1174
ret_errno = errno;
1175
1120
perror_plus("socket");
1176
errno = ret_errno;
1177
1121
return false;
1178
1122
}
1179
1123
strcpy(ifr->ifr_name, ifname);
1180
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
1125
if(ret == -1){
1182
1126
if(debug){
1183
ret_errno = errno;
1184
1127
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
1128
}
1187
1129
return false;
1188
1130
}
1257
1199
}
1258
1200
1259
1201
/*
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);
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;
1289
1242
}
1290
1243
1291
1244
int notdotentries(const struct dirent *direntry){
1360
1313
return 1;
1361
1314
}
1362
1315
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1365
1317
int ret;
1366
1318
struct timespec now;
1367
1319
struct timespec waited_time;
1368
1320
intmax_t block_time;
1369
1321
1370
1322
while(true){
1371
if(mc->current_server == NULL){
1323
if(mc.current_server == NULL){
1372
1324
if (debug){
1373
1325
fprintf_plus(stderr, "Wait until first server is found."
1374
1326
" No timeout!\n");
1388
1340
/* Calculating in ms how long time between now and server
1389
1341
who we visted longest time ago. Now - last seen. */
1390
1342
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1343
- mc.current_server->last_seen.tv_sec);
1392
1344
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1345
- mc.current_server->last_seen.tv_nsec);
1394
1346
/* total time is 10s/10,000ms.
1395
1347
Converting to s from ms by dividing by 1,000,
1396
1348
and ns to ms by dividing by 1,000,000. */
1404
1356
}
1405
1357
1406
1358
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);
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);
1411
1363
if(ret == 0){
1412
avahi_simple_poll_quit(s);
1364
avahi_simple_poll_quit(mc.simple_poll);
1413
1365
return 0;
1414
1366
}
1415
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1368
&mc.current_server->last_seen);
1417
1369
if(ret == -1){
1418
1370
perror_plus("clock_gettime");
1419
1371
return -1;
1420
1372
}
1421
mc->current_server = mc->current_server->next;
1373
mc.current_server = mc.current_server->next;
1422
1374
block_time = 0; /* Call avahi to find new Mandos
1423
1375
servers, but don't block */
1424
1376
}
1433
1385
}
1434
1386
}
1435
1387
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
1388
bool run_network_hooks(const char *mode, const char *interface,
1489
1389
const float delay){
1490
1390
struct dirent **direntries;
1493
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
1394
alphasort);
1495
1395
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
}
1396
perror_plus("scandir");
1504
1397
} else {
1505
1398
int devnull = open("/dev/null", O_RDONLY);
1506
1399
for(int i = 0; i < numhooks; i++){
1519
1412
if(hook_pid == 0){
1520
1413
/* Child */
1521
1414
/* Raise privileges */
1522
raise_privileges_permanently();
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
}
1523
1426
/* Set group */
1524
1427
errno = 0;
1525
1428
ret = setgid(0);
1545
1448
perror_plus("setenv");
1546
1449
_exit(EX_OSERR);
1547
1450
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1549
1452
if(ret == -1){
1550
1453
perror_plus("setenv");
1551
1454
_exit(EX_OSERR);
1568
1471
_exit(EX_OSERR);
1569
1472
}
1570
1473
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
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
1475
perror_plus("execl");
1580
1476
_exit(EXIT_FAILURE);
1618
1514
return true;
1619
1515
}
1620
1516
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
1517
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
1518
AvahiSServiceBrowser *sb = NULL;
1799
error_t ret_errno;
1519
int error;
1800
1520
int ret;
1801
1521
intmax_t tmpmax;
1802
1522
char *tmp;
1803
1523
int exitcode = EXIT_SUCCESS;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
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;
1806
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1807
1531
bool tempdir_created = false;
1808
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
1533
const char *seckey = PATHDIR "/" SECKEY;
1810
1534
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1813
1535
1814
1536
bool gnutls_initialized = false;
1815
1537
bool gpgme_initialized = false;
1877
1599
.group = 2 },
1878
1600
{ .name = "retry", .key = 132,
1879
1601
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1602
.doc = "Retry interval used when denied by the mandos server",
1881
1603
.group = 2 },
1882
1604
{ .name = "network-hook-dir", .key = 133,
1883
1605
.arg = "DIR",
1906
1628
connect_to = arg;
1907
1629
break;
1908
1630
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
}
1631
interface = arg;
1914
1632
break;
1915
1633
case 's': /* --seckey */
1916
1634
seckey = arg;
1994
1712
<http://bugs.debian.org/633582> */
1995
1713
1996
1714
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
} else {
1998
1720
struct stat st;
1999
1721
2000
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2040
1762
}
2041
1763
2042
1764
/* 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;
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
2060
1769
}
2061
1770
}
2062
1771
}
2063
1772
2064
1773
/* 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
}
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
2081
1776
}
2082
1777
2083
1778
if(not debug){
2084
1779
avahi_set_log_function(empty_log);
2085
1780
}
2086
1781
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
2087
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1815
from the signal handler */
2089
1816
/* Initialize the pseudo-RNG for Avahi */
2090
1817
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
2093
1820
fprintf_plus(stderr,
2094
1821
"Avahi: Failed to create simple poll object.\n");
2095
1822
exitcode = EX_UNAVAILABLE;
2159
1886
}
2160
1887
}
2161
1888
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;
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");
2208
1974
}
2209
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){
2210
1993
break;
2211
1994
}
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);
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");
2023
}
2237
2024
}
2238
2025
2239
2026
if(quit_now){
2240
2027
goto end;
2241
2028
}
2242
2029
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
ret = init_gnutls_global(pubkey, seckey);
2244
2031
if(ret == -1){
2245
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2246
2033
exitcode = EX_UNAVAILABLE;
2263
2050
goto end;
2264
2051
}
2265
2052
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2267
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2268
2055
exitcode = EX_UNAVAILABLE;
2269
2056
goto end;
2279
2066
/* Connect directly, do not use Zeroconf */
2280
2067
/* (Mainly meant for debugging) */
2281
2068
char *address = strrchr(connect_to, ':');
2282
2283
2069
if(address == NULL){
2284
2070
fprintf_plus(stderr, "No colon in address\n");
2285
2071
exitcode = EX_USAGE;
2290
2076
goto end;
2291
2077
}
2292
2078
2293
in_port_t port;
2079
uint16_t port;
2294
2080
errno = 0;
2295
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2296
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2297
or tmpmax != (in_port_t)tmpmax){
2083
or tmpmax != (uint16_t)tmpmax){
2298
2084
fprintf_plus(stderr, "Bad port number\n");
2299
2085
exitcode = EX_USAGE;
2300
2086
goto end;
2301
2087
}
2302
2088
2303
2089
if(quit_now){
2304
2090
goto end;
2305
2091
}
2306
2092
2307
port = (in_port_t)tmpmax;
2093
port = (uint16_t)tmpmax;
2308
2094
*address = '\0';
2309
2095
/* Colon in address indicates IPv6 */
2310
2096
int af;
2326
2112
}
2327
2113
2328
2114
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
2115
ret = start_mandos_communication(address, port, if_index, af);
2331
2116
if(quit_now or ret == 0){
2332
2117
break;
2333
2118
}
2335
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
2121
(int)retry_interval);
2337
2122
}
2338
sleep((unsigned int)retry_interval);
2123
sleep((int)retry_interval);
2339
2124
}
2340
2125
2341
2126
if (not quit_now){
2359
2144
config.publish_domain = 0;
2360
2145
2361
2146
/* Allocate a new server */
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2364
2150
2365
2151
/* Free the Avahi configuration data */
2366
2152
avahi_server_config_free(&config);
2369
2155
/* Check if creating the Avahi server object succeeded */
2370
2156
if(mc.server == NULL){
2371
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
2158
avahi_strerror(error));
2373
2159
exitcode = EX_UNAVAILABLE;
2374
2160
goto end;
2375
2161
}
2381
2167
/* Create the Avahi service browser */
2382
2168
sb = avahi_s_service_browser_new(mc.server, if_index,
2383
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
2170
NULL, 0, browse_callback, NULL);
2386
2171
if(sb == NULL){
2387
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
2173
avahi_strerror(avahi_server_errno(mc.server)));
2400
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2401
2186
}
2402
2187
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2405
2190
if(debug){
2406
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
2192
(ret == 0) ? "successfully" : "with error");
2414
2199
}
2415
2200
2416
2201
/* Cleanup things */
2417
free(mc.interfaces);
2418
2419
2202
if(sb != NULL)
2420
2203
avahi_s_service_browser_free(sb);
2421
2204
2422
2205
if(mc.server != NULL)
2423
2206
avahi_server_free(mc.server);
2424
2207
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2427
2210
2428
2211
if(gnutls_initialized){
2429
2212
gnutls_certificate_free_credentials(mc.cred);
2446
2229
}
2447
2230
}
2448
2231
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2449
2235
/* Re-raise priviliges */
2450
2236
{
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");
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");
2467
2253
}
2468
2254
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2472
2258
}
2473
2259
}
2474
2475
lower_privileges_permanently();
2476
}
2477
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2480
2267
2481
2268
/* Removes the GPGME temp directory and all files inside */
2482
2269
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0