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- Committer: Teddy Hogeborn
- Date: 2011-11-28 22:34:10 UTC
- mto: (505.2.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111128223410-t2eekixfaaq801aa
* initramfs-tools-hook: Warn when files needed by network hooks are
not found.
not found.
- 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
/*
198
192
size_t incbuffer(char **buffer, size_t buffer_length,
199
193
size_t buffer_capacity){
200
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(new_buf == NULL){
203
int old_errno = errno;
204
free(*buffer);
205
errno = old_errno;
206
*buffer = NULL;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
207
197
return 0;
208
198
}
209
*buffer = new_buf;
210
199
buffer_capacity += BUFFER_SIZE;
211
200
}
212
201
return buffer_capacity;
213
202
}
214
203
215
204
/* Add server to set of servers to retry periodically */
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
218
207
int ret;
219
208
server *new_server = malloc(sizeof(server));
220
209
if(new_server == NULL){
221
210
perror_plus("malloc");
222
return false;
211
return -1;
223
212
}
224
213
*new_server = (server){ .ip = strdup(ip),
225
214
.port = port,
227
216
.af = af };
228
217
if(new_server->ip == NULL){
229
218
perror_plus("strdup");
230
return false;
219
return -1;
231
220
}
232
221
/* Special case of first server */
233
if(*current_server == NULL){
222
if (mc.current_server == NULL){
234
223
new_server->next = new_server;
235
224
new_server->prev = new_server;
236
*current_server = new_server;
225
mc.current_server = new_server;
237
226
/* Place the new server last in the list */
238
227
} else {
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
241
230
new_server->prev->next = new_server;
242
(*current_server)->prev = new_server;
231
mc.current_server->prev = new_server;
243
232
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
245
234
if(ret == -1){
246
235
perror_plus("clock_gettime");
247
return false;
236
return -1;
248
237
}
249
return true;
238
return 0;
250
239
}
251
240
252
241
/*
253
242
* Initialize GPGME.
254
243
*/
255
244
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
245
const char *tempdir){
257
246
gpgme_error_t rc;
258
247
gpgme_engine_info_t engine_info;
259
248
249
260
250
/*
261
251
* Helper function to insert pub and seckey to the engine keyring.
262
252
*/
278
268
return false;
279
269
}
280
270
281
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
282
272
if(rc != GPG_ERR_NO_ERROR){
283
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
274
gpgme_strsource(rc), gpgme_strerror(rc));
328
318
}
329
319
330
320
/* Create new GPGME "context" */
331
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
332
322
if(rc != GPG_ERR_NO_ERROR){
333
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
349
339
*/
350
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
351
341
size_t crypto_size,
352
char **plaintext,
353
mandos_context *mc){
342
char **plaintext){
354
343
gpgme_data_t dh_crypto, dh_plain;
355
344
gpgme_error_t rc;
356
345
ssize_t ret;
382
371
383
372
/* Decrypt data from the cryptotext data buffer to the plaintext
384
373
data buffer */
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
386
375
if(rc != GPG_ERR_NO_ERROR){
387
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
377
gpgme_strsource(rc), gpgme_strerror(rc));
389
378
plaintext_length = -1;
390
379
if(debug){
391
380
gpgme_decrypt_result_t result;
392
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
393
382
if(result == NULL){
394
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
395
384
} else {
473
462
}
474
463
475
464
static const char * safer_gnutls_strerror(int value){
476
const char *ret = gnutls_strerror(value);
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
477
467
if(ret == NULL)
478
468
ret = "(unknown)";
479
469
return ret;
486
476
}
487
477
488
478
static int init_gnutls_global(const char *pubkeyfilename,
489
const char *seckeyfilename,
490
mandos_context *mc){
479
const char *seckeyfilename){
491
480
int ret;
492
481
493
482
if(debug){
510
499
}
511
500
512
501
/* OpenPGP credentials */
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
514
503
if(ret != GNUTLS_E_SUCCESS){
515
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
505
safer_gnutls_strerror(ret));
526
515
}
527
516
528
517
ret = gnutls_certificate_set_openpgp_key_file
529
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
530
519
GNUTLS_OPENPGP_FMT_BASE64);
531
520
if(ret != GNUTLS_E_SUCCESS){
532
521
fprintf_plus(stderr,
538
527
}
539
528
540
529
/* GnuTLS server initialization */
541
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
542
531
if(ret != GNUTLS_E_SUCCESS){
543
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
533
" initialization: %s\n",
545
534
safer_gnutls_strerror(ret));
546
535
goto globalfail;
547
536
}
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
549
538
if(ret != GNUTLS_E_SUCCESS){
550
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
540
safer_gnutls_strerror(ret));
552
541
goto globalfail;
553
542
}
554
543
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
556
545
557
546
return 0;
558
547
559
548
globalfail:
560
549
561
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
562
551
gnutls_global_deinit();
563
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
564
553
return -1;
565
554
}
566
555
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
569
557
int ret;
570
558
/* GnuTLS session creation */
571
559
do {
583
571
{
584
572
const char *err;
585
573
do {
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
587
575
if(quit_now){
588
576
gnutls_deinit(*session);
589
577
return -1;
600
588
601
589
do {
602
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
603
mc->cred);
591
mc.cred);
604
592
if(quit_now){
605
593
gnutls_deinit(*session);
606
594
return -1;
616
604
/* ignore client certificate if any. */
617
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
606
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
620
608
621
609
return 0;
622
610
}
626
614
__attribute__((unused)) const char *txt){}
627
615
628
616
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
630
618
AvahiIfIndex if_index,
631
int af, mandos_context *mc){
619
int af){
632
620
int ret, tcp_sd = -1;
633
621
ssize_t sret;
634
622
union {
664
652
return -1;
665
653
}
666
654
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
655
ret = init_gnutls_session(&session);
700
656
if(ret != 0){
701
657
return -1;
702
658
}
703
659
704
660
if(debug){
705
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
707
663
}
708
664
709
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
740
696
goto mandos_end;
741
697
}
742
698
if(af == AF_INET6){
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
748
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
753
706
if(if_index == AVAHI_IF_UNSPEC){
754
707
fprintf_plus(stderr, "An IPv6 link-local address is"
755
708
" incomplete without a network interface\n");
760
713
to.in6.sin6_scope_id = (uint32_t)if_index;
761
714
}
762
715
} else {
763
to.in.sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
764
719
}
765
720
766
721
if(quit_now){
774
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
775
730
perror_plus("if_indextoname");
776
731
} else {
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
779
734
}
780
735
} else {
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
783
738
}
784
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
785
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
863
818
goto mandos_end;
864
819
}
865
820
866
/* This casting via intptr_t is to eliminate warning about casting
867
an int to a pointer type. This is exactly how the GnuTLS Guile
868
function "set-session-transport-fd!" does it. */
869
gnutls_transport_set_ptr(session,
870
(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);
871
823
872
824
if(quit_now){
873
825
errno = EINTR;
978
930
if(buffer_length > 0){
979
931
ssize_t decrypted_buffer_size;
980
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
981
&decrypted_buffer, mc);
933
&decrypted_buffer);
982
934
if(decrypted_buffer_size >= 0){
983
935
984
936
written = 0;
1045
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1046
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1047
999
flags,
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1052
1002
1053
1003
/* Called whenever a service has been resolved successfully or
1054
1004
timed out */
1063
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1064
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1065
1015
domain,
1066
avahi_strerror(avahi_server_errno
1067
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1068
1017
break;
1069
1018
1070
1019
case AVAHI_RESOLVER_FOUND:
1076
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1077
1026
host_name, ip, (intmax_t)interface, port);
1078
1027
}
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1083
1030
if(ret == 0){
1084
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1085
1032
} else {
1086
if(not add_server(ip, (in_port_t)port, interface,
1087
avahi_proto_to_af(proto),
1088
&((mandos_context*)mc)->current_server)){
1089
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1090
" list\n", name);
1091
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1092
1035
}
1093
1036
}
1094
1037
}
1104
1047
const char *domain,
1105
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1106
1049
flags,
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1111
1052
1112
1053
/* Called whenever a new services becomes available on the LAN or
1113
1054
is removed from the LAN */
1121
1062
case AVAHI_BROWSER_FAILURE:
1122
1063
1123
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1124
avahi_strerror(avahi_server_errno
1125
(((mandos_context*)mc)->server)));
1126
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1127
1067
return;
1128
1068
1129
1069
case AVAHI_BROWSER_NEW:
1132
1072
the callback function is called the Avahi server will free the
1133
1073
resolver for us. */
1134
1074
1135
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1136
interface, protocol, name, type,
1137
domain, protocol, 0,
1138
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)
1139
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1140
1079
" %s\n", name,
1141
avahi_strerror(avahi_server_errno
1142
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1143
1081
break;
1144
1082
1145
1083
case AVAHI_BROWSER_REMOVE:
1164
1102
signal_received = sig;
1165
1103
int old_errno = errno;
1166
1104
/* set main loop to exit */
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1169
1107
}
1170
1108
errno = old_errno;
1171
1109
}
1172
1110
1173
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1174
1112
int ret;
1175
error_t ret_errno;
1176
1113
1177
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1178
1115
if(s < 0){
1179
ret_errno = errno;
1180
1116
perror_plus("socket");
1181
errno = ret_errno;
1182
1117
return false;
1183
1118
}
1184
1119
strcpy(ifr->ifr_name, ifname);
1185
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1186
1121
if(ret == -1){
1187
1122
if(debug){
1188
ret_errno = errno;
1189
1123
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1191
1124
}
1192
1125
return false;
1193
1126
}
1262
1195
}
1263
1196
1264
1197
/*
1265
* This function determines if a network interface is up.
1266
*/
1267
bool interface_is_up(const char *interface){
1268
struct ifreq ifr;
1269
if(not get_flags(interface, &ifr)){
1270
if(debug){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1273
}
1274
return false;
1275
}
1276
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1278
}
1279
1280
/*
1281
* This function determines if a network interface is running
1282
*/
1283
bool interface_is_running(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
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;
1294
1238
}
1295
1239
1296
1240
int notdotentries(const struct dirent *direntry){
1365
1309
return 1;
1366
1310
}
1367
1311
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1370
1313
int ret;
1371
1314
struct timespec now;
1372
1315
struct timespec waited_time;
1373
1316
intmax_t block_time;
1374
1317
1375
1318
while(true){
1376
if(mc->current_server == NULL){
1319
if(mc.current_server == NULL){
1377
1320
if (debug){
1378
1321
fprintf_plus(stderr, "Wait until first server is found."
1379
1322
" No timeout!\n");
1393
1336
/* Calculating in ms how long time between now and server
1394
1337
who we visted longest time ago. Now - last seen. */
1395
1338
waited_time.tv_sec = (now.tv_sec
1396
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1397
1340
waited_time.tv_nsec = (now.tv_nsec
1398
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1399
1342
/* total time is 10s/10,000ms.
1400
1343
Converting to s from ms by dividing by 1,000,
1401
1344
and ns to ms by dividing by 1,000,000. */
1409
1352
}
1410
1353
1411
1354
if(block_time <= 0){
1412
ret = start_mandos_communication(mc->current_server->ip,
1413
mc->current_server->port,
1414
mc->current_server->if_index,
1415
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);
1416
1359
if(ret == 0){
1417
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1418
1361
return 0;
1419
1362
}
1420
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1421
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1422
1365
if(ret == -1){
1423
1366
perror_plus("clock_gettime");
1424
1367
return -1;
1425
1368
}
1426
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1427
1370
block_time = 0; /* Call avahi to find new Mandos
1428
1371
servers, but don't block */
1429
1372
}
1438
1381
}
1439
1382
}
1440
1383
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1446
ret_errno = errno;
1447
perror_plus("seteuid");
1448
}
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1457
if(ret_errno != 0){
1458
errno = old_errno;
1459
return ret_errno;
1460
}
1461
if(setuid(0) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("seteuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1486
ret_errno = errno;
1487
perror_plus("setuid");
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
1384
bool run_network_hooks(const char *mode, const char *interface,
1494
1385
const float delay){
1495
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1496
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
1390
alphasort);
1498
1391
if(numhooks == -1){
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
1506
}
1392
perror_plus("scandir");
1507
1393
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
1394
int devnull = open("/dev/null", O_RDONLY);
1511
1395
for(int i = 0; i < numhooks; i++){
1512
1396
direntry = direntries[i];
1524
1408
if(hook_pid == 0){
1525
1409
/* Child */
1526
1410
/* Raise privileges */
1527
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
}
1528
1422
/* Set group */
1529
1423
errno = 0;
1530
1424
ret = setgid(0);
1550
1444
perror_plus("setenv");
1551
1445
_exit(EX_OSERR);
1552
1446
}
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1554
1448
if(ret == -1){
1555
1449
perror_plus("setenv");
1556
1450
_exit(EX_OSERR);
1573
1467
_exit(EX_OSERR);
1574
1468
}
1575
1469
free(delaystring);
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1578
if(ret == -1){
1579
perror_plus("setenv");
1580
_exit(EX_OSERR);
1581
}
1582
}
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1586
}
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1587
1472
} else {
1588
1473
int status;
1589
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1623
1508
return true;
1624
1509
}
1625
1510
1626
error_t bring_up_interface(const char *const interface,
1627
const float delay){
1628
int sd = -1;
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1634
if(if_index == 0){
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1636
errno = old_errno;
1637
return ENXIO;
1638
}
1639
1640
if(quit_now){
1641
errno = old_errno;
1642
return EINTR;
1643
}
1644
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1647
ret_errno = errno;
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1650
return ret_errno;
1651
}
1652
network.ifr_flags |= IFF_UP;
1653
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
1656
ret_errno = errno;
1657
perror_plus("socket");
1658
errno = old_errno;
1659
return ret_errno;
1660
}
1661
1662
if(quit_now){
1663
close(sd);
1664
errno = old_errno;
1665
return EINTR;
1666
}
1667
1668
if(debug){
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1670
interface);
1671
}
1672
1673
/* Raise priviliges */
1674
raise_privileges();
1675
1676
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1684
}
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
1688
#ifdef __linux__
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1693
}
1694
}
1695
#endif /* __linux__ */
1696
1697
/* Lower privileges */
1698
lower_privileges();
1699
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
1706
if(ret_setflags == -1){
1707
errno = ret_errno;
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
} else if(debug){
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
interface);
1715
}
1716
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1721
break;
1722
}
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1727
}
1728
}
1729
1730
errno = old_errno;
1731
return 0;
1732
}
1733
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1738
if(if_index == 0){
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1740
errno = old_errno;
1741
return ENXIO;
1742
}
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
return ret_errno;
1750
}
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
1755
ret_errno = errno;
1756
perror_plus("socket");
1757
errno = old_errno;
1758
return ret_errno;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise priviliges */
1767
raise_privileges();
1768
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
1771
1772
/* Lower privileges */
1773
lower_privileges();
1774
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ret_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
errno = old_errno;
1785
return ret_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1789
interface);
1790
}
1791
1792
errno = old_errno;
1793
return 0;
1794
}
1795
1796
1511
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
1801
1512
AvahiSServiceBrowser *sb = NULL;
1802
error_t ret_errno;
1513
int error;
1803
1514
int ret;
1804
1515
intmax_t tmpmax;
1805
1516
char *tmp;
1806
1517
int exitcode = EXIT_SUCCESS;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1809
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1810
1525
bool tempdir_created = false;
1811
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1812
1527
const char *seckey = PATHDIR "/" SECKEY;
1813
1528
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1815
1529
1816
1530
bool gnutls_initialized = false;
1817
1531
bool gpgme_initialized = false;
1879
1593
.group = 2 },
1880
1594
{ .name = "retry", .key = 132,
1881
1595
.arg = "SECONDS",
1882
.doc = "Retry interval used when denied by the Mandos server",
1596
.doc = "Retry interval used when denied by the mandos server",
1883
1597
.group = 2 },
1884
1598
{ .name = "network-hook-dir", .key = 133,
1885
1599
.arg = "DIR",
1908
1622
connect_to = arg;
1909
1623
break;
1910
1624
case 'i': /* --interface */
1911
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1912
arg, (int)',');
1913
if(ret_errno != 0){
1914
argp_error(state, "%s", strerror(ret_errno));
1915
}
1625
interface = arg;
1916
1626
break;
1917
1627
case 's': /* --seckey */
1918
1628
seckey = arg;
1961
1671
argp_state_help(state, state->out_stream,
1962
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1963
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1964
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1965
1677
exit(argp_err_exit_status);
1966
1678
break;
1996
1708
<http://bugs.debian.org/633582> */
1997
1709
1998
1710
/* Re-raise priviliges */
1999
if(raise_privileges() == 0){
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
2000
1716
struct stat st;
2001
1717
2002
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2042
1758
}
2043
1759
2044
1760
/* Lower privileges */
2045
lower_privileges();
2046
}
2047
}
2048
2049
/* Remove invalid interface names (except "none") */
2050
{
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2053
interface))){
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2059
}
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2061
interface = NULL;
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2062
1765
}
2063
1766
}
2064
1767
}
2065
1768
2066
1769
/* Run network hooks */
2067
{
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2072
goto end;
2073
}
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2081
1772
}
2082
1773
2083
1774
if(not debug){
2084
1775
avahi_set_log_function(empty_log);
2085
1776
}
2086
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
2087
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1811
from the signal handler */
2089
1812
/* Initialize the pseudo-RNG for Avahi */
2090
1813
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2093
1816
fprintf_plus(stderr,
2094
1817
"Avahi: Failed to create simple poll object.\n");
2095
1818
exitcode = EX_UNAVAILABLE;
2159
1882
}
2160
1883
}
2161
1884
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("argz_add");
2176
continue;
2177
}
2178
if(debug){
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
2181
}
2182
}
2183
free(direntries);
2184
} else {
2185
free(direntries);
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2188
goto end;
2189
}
2190
}
2191
2192
/* Bring up interfaces which are down, and remove any "none"s */
2193
{
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2196
interface))){
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2201
interface);
2202
interface = NULL;
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
interface);
2208
interface = NULL;
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2209
1970
}
2210
1971
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
2211
1989
break;
2212
1990
}
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2218
perror_plus("Failed to bring up interface");
2219
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2225
perror_plus("argz_add");
2226
}
2227
}
2228
}
2229
}
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2232
}
2233
}
2234
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2237
if(debug){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2239
mc.interfaces);
2240
}
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2242
2020
}
2243
2021
2244
2022
if(quit_now){
2245
2023
goto end;
2246
2024
}
2247
2025
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2026
ret = init_gnutls_global(pubkey, seckey);
2249
2027
if(ret == -1){
2250
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2251
2029
exitcode = EX_UNAVAILABLE;
2268
2046
goto end;
2269
2047
}
2270
2048
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2272
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2273
2051
exitcode = EX_UNAVAILABLE;
2274
2052
goto end;
2284
2062
/* Connect directly, do not use Zeroconf */
2285
2063
/* (Mainly meant for debugging) */
2286
2064
char *address = strrchr(connect_to, ':');
2287
2288
2065
if(address == NULL){
2289
2066
fprintf_plus(stderr, "No colon in address\n");
2290
2067
exitcode = EX_USAGE;
2295
2072
goto end;
2296
2073
}
2297
2074
2298
in_port_t port;
2075
uint16_t port;
2299
2076
errno = 0;
2300
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2301
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2302
or tmpmax != (in_port_t)tmpmax){
2079
or tmpmax != (uint16_t)tmpmax){
2303
2080
fprintf_plus(stderr, "Bad port number\n");
2304
2081
exitcode = EX_USAGE;
2305
2082
goto end;
2306
2083
}
2307
2084
2308
2085
if(quit_now){
2309
2086
goto end;
2310
2087
}
2311
2088
2312
port = (in_port_t)tmpmax;
2089
port = (uint16_t)tmpmax;
2313
2090
*address = '\0';
2314
2091
/* Colon in address indicates IPv6 */
2315
2092
int af;
2331
2108
}
2332
2109
2333
2110
while(not quit_now){
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
2111
ret = start_mandos_communication(address, port, if_index, af);
2336
2112
if(quit_now or ret == 0){
2337
2113
break;
2338
2114
}
2340
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2341
2117
(int)retry_interval);
2342
2118
}
2343
sleep((unsigned int)retry_interval);
2119
sleep((int)retry_interval);
2344
2120
}
2345
2121
2346
2122
if (not quit_now){
2364
2140
config.publish_domain = 0;
2365
2141
2366
2142
/* Allocate a new server */
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2369
2146
2370
2147
/* Free the Avahi configuration data */
2371
2148
avahi_server_config_free(&config);
2374
2151
/* Check if creating the Avahi server object succeeded */
2375
2152
if(mc.server == NULL){
2376
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
2154
avahi_strerror(error));
2378
2155
exitcode = EX_UNAVAILABLE;
2379
2156
goto end;
2380
2157
}
2386
2163
/* Create the Avahi service browser */
2387
2164
sb = avahi_s_service_browser_new(mc.server, if_index,
2388
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
2166
NULL, 0, browse_callback, NULL);
2391
2167
if(sb == NULL){
2392
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2393
2169
avahi_strerror(avahi_server_errno(mc.server)));
2405
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2406
2182
}
2407
2183
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2410
2186
if(debug){
2411
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
2188
(ret == 0) ? "successfully" : "with error");
2419
2195
}
2420
2196
2421
2197
/* Cleanup things */
2422
free(mc.interfaces);
2423
2424
2198
if(sb != NULL)
2425
2199
avahi_s_service_browser_free(sb);
2426
2200
2427
2201
if(mc.server != NULL)
2428
2202
avahi_server_free(mc.server);
2429
2203
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2432
2206
2433
2207
if(gnutls_initialized){
2434
2208
gnutls_certificate_free_credentials(mc.cred);
2451
2225
}
2452
2226
}
2453
2227
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2454
2231
/* Re-raise priviliges */
2455
2232
{
2456
raise_privileges();
2457
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2461
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2237
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2472
2249
}
2473
2250
}
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2477
2254
}
2478
2255
}
2479
2480
lower_privileges_permanently();
2481
}
2482
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2485
2263
2486
2264
/* Removes the GPGME temp directory and all files inside */
2487
2265
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0