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237.16.16
(compared to revision 237.7.179)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2011-11-28 00:27:49 UTC
- mto: (237.15.12 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111128002749-hr0te9hsoqfzvu01
* network-hooks.d/bridge: Use "/usr/sbin/brctl" explicitly.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
- 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);
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
739
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
705
-Wunreachable-code*/
765
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
766
730
perror_plus("if_indextoname");
767
731
} else {
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
770
734
}
771
735
} else {
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
774
738
}
775
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
854
818
goto mandos_end;
855
819
}
856
820
857
/* This casting via intptr_t is to eliminate warning about casting
858
an int to a pointer type. This is exactly how the GnuTLS Guile
859
function "set-session-transport-fd!" does it. */
860
gnutls_transport_set_ptr(session,
861
(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);
862
823
863
824
if(quit_now){
864
825
errno = EINTR;
969
930
if(buffer_length > 0){
970
931
ssize_t decrypted_buffer_size;
971
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
933
&decrypted_buffer);
973
934
if(decrypted_buffer_size >= 0){
974
935
975
936
written = 0;
1036
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
999
flags,
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1043
1002
1044
1003
/* Called whenever a service has been resolved successfully or
1045
1004
timed out */
1054
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1055
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1056
1015
domain,
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1059
1017
break;
1060
1018
1061
1019
case AVAHI_RESOLVER_FOUND:
1067
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1068
1026
host_name, ip, (intmax_t)interface, port);
1069
1027
}
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1074
1030
if(ret == 0){
1075
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1076
1032
} else {
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1080
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
" list\n", name);
1082
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1083
1035
}
1084
1036
}
1085
1037
}
1095
1047
const char *domain,
1096
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1049
flags,
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1102
1052
1103
1053
/* Called whenever a new services becomes available on the LAN or
1104
1054
is removed from the LAN */
1112
1062
case AVAHI_BROWSER_FAILURE:
1113
1063
1114
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1115
avahi_strerror(avahi_server_errno
1116
(((mandos_context*)mc)->server)));
1117
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1118
1067
return;
1119
1068
1120
1069
case AVAHI_BROWSER_NEW:
1123
1072
the callback function is called the Avahi server will free the
1124
1073
resolver for us. */
1125
1074
1126
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1127
interface, protocol, name, type,
1128
domain, protocol, 0,
1129
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)
1130
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1131
1079
" %s\n", name,
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1134
1081
break;
1135
1082
1136
1083
case AVAHI_BROWSER_REMOVE:
1155
1102
signal_received = sig;
1156
1103
int old_errno = errno;
1157
1104
/* set main loop to exit */
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1160
1107
}
1161
1108
errno = old_errno;
1162
1109
}
1163
1110
1164
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1112
int ret;
1166
error_t ret_errno;
1167
1113
1168
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1115
if(s < 0){
1170
ret_errno = errno;
1171
1116
perror_plus("socket");
1172
errno = ret_errno;
1173
1117
return false;
1174
1118
}
1175
1119
strcpy(ifr->ifr_name, ifname);
1176
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1121
if(ret == -1){
1178
1122
if(debug){
1179
ret_errno = errno;
1180
1123
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1182
1124
}
1183
1125
return false;
1184
1126
}
1253
1195
}
1254
1196
1255
1197
/*
1256
* This function determines if a network interface is up.
1257
*/
1258
bool interface_is_up(const char *interface){
1259
struct ifreq ifr;
1260
if(not get_flags(interface, &ifr)){
1261
if(debug){
1262
fprintf_plus(stderr, "Failed to get flags for interface "
1263
"\"%s\"\n", interface);
1264
}
1265
return false;
1266
}
1267
1268
return (bool)(ifr.ifr_flags & IFF_UP);
1269
}
1270
1271
/*
1272
* This function determines if a network interface is running
1273
*/
1274
bool interface_is_running(const char *interface){
1275
struct ifreq ifr;
1276
if(not get_flags(interface, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", interface);
1280
}
1281
return false;
1282
}
1283
1284
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;
1285
1238
}
1286
1239
1287
1240
int notdotentries(const struct dirent *direntry){
1356
1309
return 1;
1357
1310
}
1358
1311
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1361
1313
int ret;
1362
1314
struct timespec now;
1363
1315
struct timespec waited_time;
1364
1316
intmax_t block_time;
1365
1317
1366
1318
while(true){
1367
if(mc->current_server == NULL){
1319
if(mc.current_server == NULL){
1368
1320
if (debug){
1369
1321
fprintf_plus(stderr, "Wait until first server is found."
1370
1322
" No timeout!\n");
1384
1336
/* Calculating in ms how long time between now and server
1385
1337
who we visted longest time ago. Now - last seen. */
1386
1338
waited_time.tv_sec = (now.tv_sec
1387
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1388
1340
waited_time.tv_nsec = (now.tv_nsec
1389
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1390
1342
/* total time is 10s/10,000ms.
1391
1343
Converting to s from ms by dividing by 1,000,
1392
1344
and ns to ms by dividing by 1,000,000. */
1400
1352
}
1401
1353
1402
1354
if(block_time <= 0){
1403
ret = start_mandos_communication(mc->current_server->ip,
1404
mc->current_server->port,
1405
mc->current_server->if_index,
1406
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);
1407
1359
if(ret == 0){
1408
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1409
1361
return 0;
1410
1362
}
1411
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1412
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1413
1365
if(ret == -1){
1414
1366
perror_plus("clock_gettime");
1415
1367
return -1;
1416
1368
}
1417
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1418
1370
block_time = 0; /* Call avahi to find new Mandos
1419
1371
servers, but don't block */
1420
1372
}
1429
1381
}
1430
1382
}
1431
1383
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
1384
bool run_network_hooks(const char *mode, const char *interface,
1485
1385
const float delay){
1486
1386
struct dirent **direntries;
1489
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
1390
alphasort);
1491
1391
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
1392
perror_plus("scandir");
1500
1393
} else {
1501
1394
int devnull = open("/dev/null", O_RDONLY);
1502
1395
for(int i = 0; i < numhooks; i++){
1515
1408
if(hook_pid == 0){
1516
1409
/* Child */
1517
1410
/* Raise privileges */
1518
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
}
1519
1422
/* Set group */
1520
1423
errno = 0;
1521
1424
ret = setgid(0);
1528
1431
if(ret == -1){
1529
1432
perror_plus("setgroups");
1530
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1531
1436
dup2(devnull, STDIN_FILENO);
1532
1437
close(devnull);
1533
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
1446
perror_plus("setenv");
1542
1447
_exit(EX_OSERR);
1543
1448
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1545
1450
if(ret == -1){
1546
1451
perror_plus("setenv");
1547
1452
_exit(EX_OSERR);
1564
1469
_exit(EX_OSERR);
1565
1470
}
1566
1471
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1578
1474
} else {
1579
1475
int status;
1580
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1614
1510
return true;
1615
1511
}
1616
1512
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1623
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1625
if(if_index == 0){
1626
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
errno = old_errno;
1628
return ENXIO;
1629
}
1630
1631
if(quit_now){
1632
errno = old_errno;
1633
return EINTR;
1634
}
1635
1636
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1638
ret_errno = errno;
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1640
"\"%s\"\n", interface);
1641
return ret_errno;
1642
}
1643
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1647
ret_errno = errno;
1648
perror_plus("socket");
1649
errno = old_errno;
1650
return ret_errno;
1651
}
1652
1653
if(quit_now){
1654
close(sd);
1655
errno = old_errno;
1656
return EINTR;
1657
}
1658
1659
if(debug){
1660
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
interface);
1662
}
1663
1664
/* Raise priviliges */
1665
raise_privileges();
1666
1667
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1675
}
1676
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret_linux = klogctl(7, NULL, 0);
1682
if(ret_linux == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
1688
/* Lower privileges */
1689
lower_privileges();
1690
1691
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1693
if(ret == -1){
1694
perror_plus("close");
1695
}
1696
1697
if(ret_setflags == -1){
1698
errno = ret_errno;
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
errno = old_errno;
1701
return ret_errno;
1702
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
}
1707
1708
/* Sleep checking until interface is running.
1709
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1712
break;
1713
}
1714
struct timespec sleeptime = { .tv_nsec = 250000000 };
1715
ret = nanosleep(&sleeptime, NULL);
1716
if(ret == -1 and errno != EINTR){
1717
perror_plus("nanosleep");
1718
}
1719
}
1720
1721
errno = old_errno;
1722
return 0;
1723
}
1724
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
if(interface_is_up(interface)){
1738
if(not get_flags(interface, &network) and debug){
1739
ret_errno = errno;
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
return ret_errno;
1743
}
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1748
ret_errno = errno;
1749
perror_plus("socket");
1750
errno = old_errno;
1751
return ret_errno;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
1767
1768
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
if(ret == -1){
1771
perror_plus("close");
1772
}
1773
1774
if(ret_setflags == -1){
1775
errno = ret_errno;
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
errno = old_errno;
1778
return ret_errno;
1779
}
1780
} else if(debug){
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1782
interface);
1783
}
1784
1785
errno = old_errno;
1786
return 0;
1787
}
1788
1789
1513
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
1794
1514
AvahiSServiceBrowser *sb = NULL;
1795
error_t ret_errno;
1515
int error;
1796
1516
int ret;
1797
1517
intmax_t tmpmax;
1798
1518
char *tmp;
1799
1519
int exitcode = EXIT_SUCCESS;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1520
const char *interface = "";
1521
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
1524
uid_t uid;
1525
gid_t gid;
1802
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1803
1527
bool tempdir_created = false;
1804
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
1529
const char *seckey = PATHDIR "/" SECKEY;
1806
1530
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1531
1810
1532
bool gnutls_initialized = false;
1811
1533
bool gpgme_initialized = false;
1873
1595
.group = 2 },
1874
1596
{ .name = "retry", .key = 132,
1875
1597
.arg = "SECONDS",
1876
.doc = "Retry interval used when denied by the Mandos server",
1598
.doc = "Retry interval used when denied by the mandos server",
1877
1599
.group = 2 },
1878
1600
{ .name = "network-hook-dir", .key = 133,
1879
1601
.arg = "DIR",
1902
1624
connect_to = arg;
1903
1625
break;
1904
1626
case 'i': /* --interface */
1905
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1906
arg, (int)',');
1907
if(ret_errno != 0){
1908
argp_error(state, "%s", strerror(ret_errno));
1909
}
1627
interface = arg;
1910
1628
break;
1911
1629
case 's': /* --seckey */
1912
1630
seckey = arg;
1955
1673
argp_state_help(state, state->out_stream,
1956
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1957
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1958
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1959
1679
exit(argp_err_exit_status);
1960
1680
break;
1990
1710
<http://bugs.debian.org/633582> */
1991
1711
1992
1712
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
} else {
1994
1718
struct stat st;
1995
1719
1996
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2036
1760
}
2037
1761
2038
1762
/* Lower privileges */
2039
lower_privileges();
2040
}
2041
}
2042
2043
/* Remove invalid interface names (except "none") */
2044
{
2045
char *interface = NULL;
2046
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2047
interface))){
2048
if(strcmp(interface, "none") != 0
2049
and if_nametoindex(interface) == 0){
2050
if(interface[0] != '\0'){
2051
fprintf_plus(stderr, "Not using nonexisting interface"
2052
" \"%s\"\n", interface);
2053
}
2054
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2055
interface = NULL;
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2056
1767
}
2057
1768
}
2058
1769
}
2059
1770
2060
1771
/* Run network hooks */
2061
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
2066
goto end;
2067
}
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2077
1774
}
2078
1775
2079
1776
if(not debug){
2080
1777
avahi_set_log_function(empty_log);
2081
1778
}
2082
1779
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
2083
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2084
1813
from the signal handler */
2085
1814
/* Initialize the pseudo-RNG for Avahi */
2086
1815
srand((unsigned int) time(NULL));
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2089
1818
fprintf_plus(stderr,
2090
1819
"Avahi: Failed to create simple poll object.\n");
2091
1820
exitcode = EX_UNAVAILABLE;
2155
1884
}
2156
1885
}
2157
1886
2158
/* If no interfaces were specified, make a list */
2159
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2161
/* Look for any good interfaces */
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2163
alphasort);
2164
if(ret >= 1){
2165
/* Add all found interfaces to interfaces list */
2166
for(int i = 0; i < ret; ++i){
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
direntries[i]->d_name);
2169
if(ret_errno != 0){
2170
perror_plus("argz_add");
2171
continue;
2172
}
2173
if(debug){
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
direntries[i]->d_name);
2176
}
2177
}
2178
free(direntries);
2179
} else {
2180
free(direntries);
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2182
exitcode = EXIT_FAILURE;
2183
goto end;
2184
}
2185
}
2186
2187
/* Bring up interfaces which are down, and remove any "none"s */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
/* If interface name is "none", stop bringing up interfaces.
2193
Also remove all instances of "none" from the list */
2194
if(strcmp(interface, "none") == 0){
2195
argz_delete(&mc.interfaces, &mc.interfaces_size,
2196
interface);
2197
interface = NULL;
2198
while((interface = argz_next(mc.interfaces,
2199
mc.interfaces_size, interface))){
2200
if(strcmp(interface, "none") == 0){
2201
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
interface);
2203
interface = NULL;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1907
#ifdef __linux__
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1912
if(ret == -1){
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1915
}
1916
#endif /* __linux__ */
1917
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1922
#ifdef __linux__
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
1933
if(ret == -1){
1934
perror_plus("seteuid");
1935
}
1936
goto end;
1937
}
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
1942
#ifdef __linux__
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
1954
if(ret == -1){
1955
perror_plus("seteuid");
1956
}
1957
goto end;
1958
}
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1967
#ifdef __linux__
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
2204
1972
}
2205
1973
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
1978
if(ret == -1){
1979
perror_plus("seteuid");
1980
}
1981
goto end;
1982
}
1983
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
2206
1991
break;
2207
1992
}
2208
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2210
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2214
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2218
}
2219
}
2220
}
2221
if(debug and (interfaces_to_take_down == NULL)){
2222
fprintf_plus(stderr, "No interfaces were brought up\n");
2223
}
2224
}
2225
2226
/* If we only got one interface, explicitly use only that one */
2227
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2228
if(debug){
2229
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2230
mc.interfaces);
2231
}
2232
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1997
}
1998
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
2005
}
2006
#ifdef __linux__
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
2021
}
2233
2022
}
2234
2023
2235
2024
if(quit_now){
2236
2025
goto end;
2237
2026
}
2238
2027
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2028
ret = init_gnutls_global(pubkey, seckey);
2240
2029
if(ret == -1){
2241
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
2031
exitcode = EX_UNAVAILABLE;
2259
2048
goto end;
2260
2049
}
2261
2050
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2263
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2264
2053
exitcode = EX_UNAVAILABLE;
2265
2054
goto end;
2275
2064
/* Connect directly, do not use Zeroconf */
2276
2065
/* (Mainly meant for debugging) */
2277
2066
char *address = strrchr(connect_to, ':');
2278
2279
2067
if(address == NULL){
2280
2068
fprintf_plus(stderr, "No colon in address\n");
2281
2069
exitcode = EX_USAGE;
2286
2074
goto end;
2287
2075
}
2288
2076
2289
in_port_t port;
2077
uint16_t port;
2290
2078
errno = 0;
2291
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2292
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2293
or tmpmax != (in_port_t)tmpmax){
2081
or tmpmax != (uint16_t)tmpmax){
2294
2082
fprintf_plus(stderr, "Bad port number\n");
2295
2083
exitcode = EX_USAGE;
2296
2084
goto end;
2297
2085
}
2298
2086
2299
2087
if(quit_now){
2300
2088
goto end;
2301
2089
}
2302
2090
2303
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2304
2092
*address = '\0';
2305
2093
/* Colon in address indicates IPv6 */
2306
2094
int af;
2322
2110
}
2323
2111
2324
2112
while(not quit_now){
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2327
2114
if(quit_now or ret == 0){
2328
2115
break;
2329
2116
}
2331
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
2119
(int)retry_interval);
2333
2120
}
2334
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2335
2122
}
2336
2123
2337
2124
if (not quit_now){
2355
2142
config.publish_domain = 0;
2356
2143
2357
2144
/* Allocate a new server */
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2360
2148
2361
2149
/* Free the Avahi configuration data */
2362
2150
avahi_server_config_free(&config);
2365
2153
/* Check if creating the Avahi server object succeeded */
2366
2154
if(mc.server == NULL){
2367
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2156
avahi_strerror(error));
2369
2157
exitcode = EX_UNAVAILABLE;
2370
2158
goto end;
2371
2159
}
2377
2165
/* Create the Avahi service browser */
2378
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
2379
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2168
NULL, 0, browse_callback, NULL);
2382
2169
if(sb == NULL){
2383
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
2171
avahi_strerror(avahi_server_errno(mc.server)));
2396
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
2184
}
2398
2185
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2401
2188
if(debug){
2402
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
2190
(ret == 0) ? "successfully" : "with error");
2410
2197
}
2411
2198
2412
2199
/* Cleanup things */
2413
free(mc.interfaces);
2414
2415
2200
if(sb != NULL)
2416
2201
avahi_s_service_browser_free(sb);
2417
2202
2418
2203
if(mc.server != NULL)
2419
2204
avahi_server_free(mc.server);
2420
2205
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2423
2208
2424
2209
if(gnutls_initialized){
2425
2210
gnutls_certificate_free_credentials(mc.cred);
2442
2227
}
2443
2228
}
2444
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2445
2233
/* Re-raise priviliges */
2446
2234
{
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2239
}
2240
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2463
2251
}
2464
2252
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2468
2256
}
2469
2257
}
2470
2471
lower_privileges_permanently();
2472
}
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2258
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2476
2265
2477
2266
/* Removes the GPGME temp directory and all files inside */
2478
2267
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0