To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 505.3.10
- compare with another revision
- download diff
- download tarball
- view history from revision 505.3.10
- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (505.2.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124201524-5w9ovzpuw3drdlgf
* network-hooks.d: New directory.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
setgid(), pause() */
76
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
89
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
90
95
91
#ifdef __linux__
96
92
#include <sys/klog.h> /* klogctl() */
138
134
static const char sys_class_net[] = "/sys/class/net";
139
135
char *connect_to = NULL;
140
136
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
137
144
138
/* Doubly linked list that need to be circularly linked when used */
145
139
typedef struct server{
146
140
const char *ip;
147
in_port_t port;
141
uint16_t port;
148
142
AvahiIfIndex if_index;
149
143
int af;
150
144
struct timespec last_seen;
154
148
155
149
/* Used for passing in values through the Avahi callback functions */
156
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
157
152
AvahiServer *server;
158
153
gnutls_certificate_credentials_t cred;
159
154
unsigned int dh_bits;
161
156
const char *priority;
162
157
gpgme_ctx_t ctx;
163
158
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
159
} mandos_context;
167
160
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
170
166
171
167
sig_atomic_t quit_now = 0;
172
168
int signal_received = 0;
173
169
174
170
/* Function to use when printing errors */
175
171
void perror_plus(const char *print_text){
176
int e = errno;
177
172
fprintf(stderr, "Mandos plugin %s: ",
178
173
program_invocation_short_name);
179
errno = e;
180
174
perror(print_text);
181
175
}
182
176
183
__attribute__((format (gnu_printf, 2, 3)))
184
177
int fprintf_plus(FILE *stream, const char *format, ...){
185
178
va_list ap;
186
179
va_start (ap, format);
208
201
}
209
202
210
203
/* 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){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
213
206
int ret;
214
207
server *new_server = malloc(sizeof(server));
215
208
if(new_server == NULL){
216
209
perror_plus("malloc");
217
return false;
210
return -1;
218
211
}
219
212
*new_server = (server){ .ip = strdup(ip),
220
213
.port = port,
222
215
.af = af };
223
216
if(new_server->ip == NULL){
224
217
perror_plus("strdup");
225
return false;
218
return -1;
226
219
}
227
220
/* Special case of first server */
228
if(*current_server == NULL){
221
if (mc.current_server == NULL){
229
222
new_server->next = new_server;
230
223
new_server->prev = new_server;
231
*current_server = new_server;
224
mc.current_server = new_server;
232
225
/* Place the new server last in the list */
233
226
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
236
229
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
230
mc.current_server->prev = new_server;
238
231
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
233
if(ret == -1){
241
234
perror_plus("clock_gettime");
242
return false;
235
return -1;
243
236
}
244
return true;
237
return 0;
245
238
}
246
239
247
240
/*
248
241
* Initialize GPGME.
249
242
*/
250
243
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
244
const char *tempdir){
252
245
gpgme_error_t rc;
253
246
gpgme_engine_info_t engine_info;
254
247
248
255
249
/*
256
250
* Helper function to insert pub and seckey to the engine keyring.
257
251
*/
273
267
return false;
274
268
}
275
269
276
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
277
271
if(rc != GPG_ERR_NO_ERROR){
278
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
273
gpgme_strsource(rc), gpgme_strerror(rc));
323
317
}
324
318
325
319
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
327
321
if(rc != GPG_ERR_NO_ERROR){
328
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
338
*/
345
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
340
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
341
char **plaintext){
349
342
gpgme_data_t dh_crypto, dh_plain;
350
343
gpgme_error_t rc;
351
344
ssize_t ret;
377
370
378
371
/* Decrypt data from the cryptotext data buffer to the plaintext
379
372
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
374
if(rc != GPG_ERR_NO_ERROR){
382
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
376
gpgme_strsource(rc), gpgme_strerror(rc));
384
377
plaintext_length = -1;
385
378
if(debug){
386
379
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
388
381
if(result == NULL){
389
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
383
} else {
468
461
}
469
462
470
463
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
472
466
if(ret == NULL)
473
467
ret = "(unknown)";
474
468
return ret;
481
475
}
482
476
483
477
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
478
const char *seckeyfilename){
486
479
int ret;
487
480
488
481
if(debug){
505
498
}
506
499
507
500
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
509
502
if(ret != GNUTLS_E_SUCCESS){
510
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
504
safer_gnutls_strerror(ret));
521
514
}
522
515
523
516
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
525
518
GNUTLS_OPENPGP_FMT_BASE64);
526
519
if(ret != GNUTLS_E_SUCCESS){
527
520
fprintf_plus(stderr,
533
526
}
534
527
535
528
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
537
530
if(ret != GNUTLS_E_SUCCESS){
538
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
532
" initialization: %s\n",
540
533
safer_gnutls_strerror(ret));
541
534
goto globalfail;
542
535
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
537
if(ret != GNUTLS_E_SUCCESS){
545
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
539
safer_gnutls_strerror(ret));
547
540
goto globalfail;
548
541
}
549
542
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
544
552
545
return 0;
553
546
554
547
globalfail:
555
548
556
gnutls_certificate_free_credentials(mc->cred);
549
gnutls_certificate_free_credentials(mc.cred);
557
550
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
551
gnutls_dh_params_deinit(mc.dh_params);
559
552
return -1;
560
553
}
561
554
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
564
556
int ret;
565
557
/* GnuTLS session creation */
566
558
do {
578
570
{
579
571
const char *err;
580
572
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
574
if(quit_now){
583
575
gnutls_deinit(*session);
584
576
return -1;
595
587
596
588
do {
597
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
590
mc.cred);
599
591
if(quit_now){
600
592
gnutls_deinit(*session);
601
593
return -1;
611
603
/* ignore client certificate if any. */
612
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
605
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
607
616
608
return 0;
617
609
}
621
613
__attribute__((unused)) const char *txt){}
622
614
623
615
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
625
617
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
618
int af){
627
619
int ret, tcp_sd = -1;
628
620
ssize_t sret;
629
621
union {
659
651
return -1;
660
652
}
661
653
662
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
663
/* Check if the interface is one of the interfaces we are using */
664
bool match = false;
665
{
666
char *interface = NULL;
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
669
if(if_nametoindex(interface) == (unsigned int)if_index){
670
match = true;
671
break;
672
}
673
}
674
}
675
if(not match){
676
if(debug){
677
char interface[IF_NAMESIZE];
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
679
perror_plus("if_indextoname");
680
} else {
681
fprintf_plus(stderr, "Skipping server on non-used interface"
682
" \"%s\"\n",
683
if_indextoname((unsigned int)if_index,
684
interface));
685
}
686
}
687
return -1;
688
}
689
}
690
691
ret = init_gnutls_session(&session, mc);
654
ret = init_gnutls_session(&session);
692
655
if(ret != 0){
693
656
return -1;
694
657
}
695
658
696
659
if(debug){
697
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
698
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
699
662
}
700
663
701
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
732
695
goto mandos_end;
733
696
}
734
697
if(af == AF_INET6){
735
to.in6.sin6_port = htons(port);
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
736
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
737
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
738
704
-Wunreachable-code*/
762
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
763
729
perror_plus("if_indextoname");
764
730
} else {
765
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
766
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
767
733
}
768
734
} else {
769
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
770
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
771
737
}
772
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
773
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
851
817
goto mandos_end;
852
818
}
853
819
854
/* This casting via intptr_t is to eliminate warning about casting
855
an int to a pointer type. This is exactly how the GnuTLS Guile
856
function "set-session-transport-fd!" does it. */
857
gnutls_transport_set_ptr(session,
858
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
859
822
860
823
if(quit_now){
861
824
errno = EINTR;
966
929
if(buffer_length > 0){
967
930
ssize_t decrypted_buffer_size;
968
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
969
&decrypted_buffer, mc);
932
&decrypted_buffer);
970
933
if(decrypted_buffer_size >= 0){
971
934
972
935
written = 0;
1033
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1034
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1035
998
flags,
1036
void* mc){
1037
if(r == NULL){
1038
return;
1039
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1040
1001
1041
1002
/* Called whenever a service has been resolved successfully or
1042
1003
timed out */
1051
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1052
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1053
1014
domain,
1054
avahi_strerror(avahi_server_errno
1055
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1056
1016
break;
1057
1017
1058
1018
case AVAHI_RESOLVER_FOUND:
1064
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1065
1025
host_name, ip, (intmax_t)interface, port);
1066
1026
}
1067
int ret = start_mandos_communication(ip, (in_port_t)port,
1068
interface,
1069
avahi_proto_to_af(proto),
1070
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1071
1029
if(ret == 0){
1072
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1073
1031
} else {
1074
if(not add_server(ip, (in_port_t)port, interface,
1075
avahi_proto_to_af(proto),
1076
&((mandos_context*)mc)->current_server)){
1077
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1078
" list\n", name);
1079
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1080
1034
}
1081
1035
}
1082
1036
}
1092
1046
const char *domain,
1093
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1094
1048
flags,
1095
void* mc){
1096
if(b == NULL){
1097
return;
1098
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1099
1051
1100
1052
/* Called whenever a new services becomes available on the LAN or
1101
1053
is removed from the LAN */
1109
1061
case AVAHI_BROWSER_FAILURE:
1110
1062
1111
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1112
avahi_strerror(avahi_server_errno
1113
(((mandos_context*)mc)->server)));
1114
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1115
1066
return;
1116
1067
1117
1068
case AVAHI_BROWSER_NEW:
1120
1071
the callback function is called the Avahi server will free the
1121
1072
resolver for us. */
1122
1073
1123
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1124
interface, protocol, name, type,
1125
domain, protocol, 0,
1126
resolve_callback, mc) == NULL)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1127
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1128
1078
" %s\n", name,
1129
avahi_strerror(avahi_server_errno
1130
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1131
1080
break;
1132
1081
1133
1082
case AVAHI_BROWSER_REMOVE:
1152
1101
signal_received = sig;
1153
1102
int old_errno = errno;
1154
1103
/* set main loop to exit */
1155
if(simple_poll != NULL){
1156
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1157
1106
}
1158
1107
errno = old_errno;
1159
1108
}
1160
1109
1161
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1162
1111
int ret;
1163
error_t ret_errno;
1164
1112
1165
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1166
1114
if(s < 0){
1167
ret_errno = errno;
1168
1115
perror_plus("socket");
1169
errno = ret_errno;
1170
1116
return false;
1171
1117
}
1172
1118
strcpy(ifr->ifr_name, ifname);
1173
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1174
1120
if(ret == -1){
1175
1121
if(debug){
1176
ret_errno = errno;
1177
1122
perror_plus("ioctl SIOCGIFFLAGS");
1178
errno = ret_errno;
1179
1123
}
1180
1124
return false;
1181
1125
}
1250
1194
}
1251
1195
1252
1196
/*
1253
* This function determines if a network interface is up.
1254
*/
1255
bool interface_is_up(const char *interface){
1256
struct ifreq ifr;
1257
if(not get_flags(interface, &ifr)){
1258
if(debug){
1259
fprintf_plus(stderr, "Failed to get flags for interface "
1260
"\"%s\"\n", interface);
1261
}
1262
return false;
1263
}
1264
1265
return (bool)(ifr.ifr_flags & IFF_UP);
1266
}
1267
1268
/*
1269
* This function determines if a network interface is running
1270
*/
1271
bool interface_is_running(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1282
1237
}
1283
1238
1284
1239
int notdotentries(const struct dirent *direntry){
1346
1301
}
1347
1302
return 0;
1348
1303
}
1349
if(debug){
1350
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1351
direntry->d_name);
1352
}
1353
1304
return 1;
1354
1305
}
1355
1306
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1357
mandos_context *mc){
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1358
1308
int ret;
1359
1309
struct timespec now;
1360
1310
struct timespec waited_time;
1361
1311
intmax_t block_time;
1362
1312
1363
1313
while(true){
1364
if(mc->current_server == NULL){
1314
if(mc.current_server == NULL){
1365
1315
if (debug){
1366
1316
fprintf_plus(stderr, "Wait until first server is found."
1367
1317
" No timeout!\n");
1381
1331
/* Calculating in ms how long time between now and server
1382
1332
who we visted longest time ago. Now - last seen. */
1383
1333
waited_time.tv_sec = (now.tv_sec
1384
- mc->current_server->last_seen.tv_sec);
1334
- mc.current_server->last_seen.tv_sec);
1385
1335
waited_time.tv_nsec = (now.tv_nsec
1386
- mc->current_server->last_seen.tv_nsec);
1336
- mc.current_server->last_seen.tv_nsec);
1387
1337
/* total time is 10s/10,000ms.
1388
1338
Converting to s from ms by dividing by 1,000,
1389
1339
and ns to ms by dividing by 1,000,000. */
1397
1347
}
1398
1348
1399
1349
if(block_time <= 0){
1400
ret = start_mandos_communication(mc->current_server->ip,
1401
mc->current_server->port,
1402
mc->current_server->if_index,
1403
mc->current_server->af, mc);
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1404
1354
if(ret == 0){
1405
avahi_simple_poll_quit(s);
1355
avahi_simple_poll_quit(mc.simple_poll);
1406
1356
return 0;
1407
1357
}
1408
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1409
&mc->current_server->last_seen);
1359
&mc.current_server->last_seen);
1410
1360
if(ret == -1){
1411
1361
perror_plus("clock_gettime");
1412
1362
return -1;
1413
1363
}
1414
mc->current_server = mc->current_server->next;
1364
mc.current_server = mc.current_server->next;
1415
1365
block_time = 0; /* Call avahi to find new Mandos
1416
1366
servers, but don't block */
1417
1367
}
1426
1376
}
1427
1377
}
1428
1378
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
1379
bool run_network_hooks(const char *mode, const char *interface,
1482
1380
const float delay){
1483
1381
struct dirent **direntries;
1486
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1487
1385
alphasort);
1488
1386
if(numhooks == -1){
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
1496
}
1387
perror_plus("scandir");
1497
1388
} else {
1498
1389
int devnull = open("/dev/null", O_RDONLY);
1499
1390
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1391
direntry = direntries[0];
1501
1392
char *fullname = NULL;
1502
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1503
1394
if(ret < 0){
1504
1395
perror_plus("asprintf");
1505
1396
continue;
1506
1397
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1511
1398
pid_t hook_pid = fork();
1512
1399
if(hook_pid == 0){
1513
1400
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1528
1401
dup2(devnull, STDIN_FILENO);
1529
1402
close(devnull);
1530
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1532
1405
if(ret == -1){
1533
1406
perror_plus("setenv");
1534
_exit(EX_OSERR);
1407
return false;
1535
1408
}
1536
1409
ret = setenv("DEVICE", interface, 1);
1537
1410
if(ret == -1){
1538
1411
perror_plus("setenv");
1539
_exit(EX_OSERR);
1412
return false;
1540
1413
}
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1542
1415
if(ret == -1){
1543
1416
perror_plus("setenv");
1544
_exit(EX_OSERR);
1417
return false;
1545
1418
}
1546
1419
ret = setenv("MODE", mode, 1);
1547
1420
if(ret == -1){
1548
1421
perror_plus("setenv");
1549
_exit(EX_OSERR);
1422
return false;
1550
1423
}
1551
1424
char *delaystring;
1552
1425
ret = asprintf(&delaystring, "%f", delay);
1553
1426
if(ret == -1){
1554
1427
perror_plus("asprintf");
1555
_exit(EX_OSERR);
1428
return false;
1556
1429
}
1557
1430
ret = setenv("DELAY", delaystring, 1);
1558
1431
if(ret == -1){
1559
1432
free(delaystring);
1560
1433
perror_plus("setenv");
1561
_exit(EX_OSERR);
1434
return false;
1562
1435
}
1563
1436
free(delaystring);
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1575
1439
} else {
1576
1440
int status;
1577
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1601
1465
}
1602
1466
}
1603
1467
free(fullname);
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1468
if(quit_now){
1469
break;
1607
1470
}
1608
1471
}
1609
1472
close(devnull);
1611
1474
return true;
1612
1475
}
1613
1476
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
1620
struct ifreq network;
1621
unsigned int if_index = if_nametoindex(interface);
1622
if(if_index == 0){
1623
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1624
errno = old_errno;
1625
return ENXIO;
1626
}
1627
1628
if(quit_now){
1629
errno = old_errno;
1630
return EINTR;
1631
}
1632
1633
if(not interface_is_up(interface)){
1634
if(not get_flags(interface, &network) and debug){
1635
ret_errno = errno;
1636
fprintf_plus(stderr, "Failed to get flags for interface "
1637
"\"%s\"\n", interface);
1638
return ret_errno;
1639
}
1640
network.ifr_flags |= IFF_UP;
1641
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
1644
ret_errno = errno;
1645
perror_plus("socket");
1646
errno = old_errno;
1647
return ret_errno;
1648
}
1649
1650
if(quit_now){
1651
close(sd);
1652
errno = old_errno;
1653
return EINTR;
1654
}
1655
1656
if(debug){
1657
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1658
interface);
1659
}
1660
1661
/* Raise priviliges */
1662
raise_privileges();
1663
1664
#ifdef __linux__
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
1672
}
1673
#endif /* __linux__ */
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
1676
#ifdef __linux__
1677
if(restore_loglevel){
1678
ret_linux = klogctl(7, NULL, 0);
1679
if(ret_linux == -1){
1680
perror_plus("klogctl");
1681
}
1682
}
1683
#endif /* __linux__ */
1684
1685
/* Lower privileges */
1686
lower_privileges();
1687
1688
/* Close the socket */
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1690
if(ret == -1){
1691
perror_plus("close");
1692
}
1693
1694
if(ret_setflags == -1){
1695
errno = ret_errno;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
errno = old_errno;
1698
return ret_errno;
1699
}
1700
} else if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1702
interface);
1703
}
1704
1705
/* Sleep checking until interface is running.
1706
Check every 0.25s, up to total time of delay */
1707
for(int i=0; i < delay * 4; i++){
1708
if(interface_is_running(interface)){
1709
break;
1710
}
1711
struct timespec sleeptime = { .tv_nsec = 250000000 };
1712
ret = nanosleep(&sleeptime, NULL);
1713
if(ret == -1 and errno != EINTR){
1714
perror_plus("nanosleep");
1715
}
1716
}
1717
1718
errno = old_errno;
1719
return 0;
1720
}
1721
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
1727
struct ifreq network;
1728
unsigned int if_index = if_nametoindex(interface);
1729
if(if_index == 0){
1730
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1731
errno = old_errno;
1732
return ENXIO;
1733
}
1734
if(interface_is_up(interface)){
1735
if(not get_flags(interface, &network) and debug){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
return ret_errno;
1740
}
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1742
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
1745
ret_errno = errno;
1746
perror_plus("socket");
1747
errno = old_errno;
1748
return ret_errno;
1749
}
1750
1751
if(debug){
1752
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1753
interface);
1754
}
1755
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
1764
1765
/* Close the socket */
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1767
if(ret == -1){
1768
perror_plus("close");
1769
}
1770
1771
if(ret_setflags == -1){
1772
errno = ret_errno;
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1774
errno = old_errno;
1775
return ret_errno;
1776
}
1777
} else if(debug){
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1779
interface);
1780
}
1781
1782
errno = old_errno;
1783
return 0;
1784
}
1785
1786
1477
int main(int argc, char *argv[]){
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
1791
1478
AvahiSServiceBrowser *sb = NULL;
1792
error_t ret_errno;
1479
int error;
1793
1480
int ret;
1794
1481
intmax_t tmpmax;
1795
1482
char *tmp;
1796
1483
int exitcode = EXIT_SUCCESS;
1797
char *interfaces_to_take_down = NULL;
1798
size_t interfaces_to_take_down_size = 0;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1799
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1800
1491
bool tempdir_created = false;
1801
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1802
1493
const char *seckey = PATHDIR "/" SECKEY;
1803
1494
const char *pubkey = PATHDIR "/" PUBKEY;
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
1806
1495
1807
1496
bool gnutls_initialized = false;
1808
1497
bool gpgme_initialized = false;
1870
1559
.group = 2 },
1871
1560
{ .name = "retry", .key = 132,
1872
1561
.arg = "SECONDS",
1873
.doc = "Retry interval used when denied by the Mandos server",
1562
.doc = "Retry interval used when denied by the mandos server",
1874
1563
.group = 2 },
1875
1564
{ .name = "network-hook-dir", .key = 133,
1876
1565
.arg = "DIR",
1899
1588
connect_to = arg;
1900
1589
break;
1901
1590
case 'i': /* --interface */
1902
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1903
arg, (int)',');
1904
if(ret_errno != 0){
1905
argp_error(state, "%s", strerror(ret_errno));
1906
}
1591
interface = arg;
1907
1592
break;
1908
1593
case 's': /* --seckey */
1909
1594
seckey = arg;
1952
1637
argp_state_help(state, state->out_stream,
1953
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1954
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1955
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1956
1643
exit(argp_err_exit_status);
1957
1644
break;
1985
1672
{
1986
1673
/* Work around Debian bug #633582:
1987
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
1988
1676
1989
1677
/* Re-raise priviliges */
1990
if(raise_privileges() == 0){
1991
struct stat st;
1992
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1994
int seckey_fd = open(seckey, O_RDONLY);
1995
if(seckey_fd == -1){
1996
perror_plus("open");
1997
} else {
1998
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1999
if(ret == -1){
2000
perror_plus("fstat");
2001
} else {
2002
if(S_ISREG(st.st_mode)
2003
and st.st_uid == 0 and st.st_gid == 0){
2004
ret = fchown(seckey_fd, uid, gid);
2005
if(ret == -1){
2006
perror_plus("fchown");
2007
}
2008
}
2009
}
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2011
}
2012
}
2013
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2016
if(pubkey_fd == -1){
2017
perror_plus("open");
2018
} else {
2019
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2020
if(ret == -1){
2021
perror_plus("fstat");
2022
} else {
2023
if(S_ISREG(st.st_mode)
2024
and st.st_uid == 0 and st.st_gid == 0){
2025
ret = fchown(pubkey_fd, uid, gid);
2026
if(ret == -1){
2027
perror_plus("fchown");
2028
}
2029
}
2030
}
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2035
/* Lower privileges */
2036
lower_privileges();
2037
}
2038
}
2039
2040
/* Remove invalid interface names (except "none") */
2041
{
2042
char *interface = NULL;
2043
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2044
interface))){
2045
if(strcmp(interface, "none") != 0
2046
and if_nametoindex(interface) == 0){
2047
if(interface[0] != '\0'){
2048
fprintf_plus(stderr, "Not using nonexisting interface"
2049
" \"%s\"\n", interface);
2050
}
2051
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2052
interface = NULL;
2053
}
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2054
1731
}
2055
1732
}
2056
1733
2057
1734
/* Run network hooks */
2058
1735
{
2059
if(mc.interfaces != NULL){
2060
interfaces_hooks = malloc(mc.interfaces_size);
2061
if(interfaces_hooks == NULL){
2062
perror_plus("malloc");
2063
goto end;
2064
}
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
2069
1741
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
1742
if(not run_network_hooks("start", interface, delay)){
2072
1743
goto end;
2073
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2074
1751
}
2075
1752
2076
1753
if(not debug){
2077
1754
avahi_set_log_function(empty_log);
2078
1755
}
2079
1756
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
2080
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2081
1790
from the signal handler */
2082
1791
/* Initialize the pseudo-RNG for Avahi */
2083
1792
srand((unsigned int) time(NULL));
2084
simple_poll = avahi_simple_poll_new();
2085
if(simple_poll == NULL){
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2086
1795
fprintf_plus(stderr,
2087
1796
"Avahi: Failed to create simple poll object.\n");
2088
1797
exitcode = EX_UNAVAILABLE;
2152
1861
}
2153
1862
}
2154
1863
2155
/* If no interfaces were specified, make a list */
2156
if(mc.interfaces == NULL){
2157
struct dirent **direntries;
2158
/* Look for any good interfaces */
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2160
alphasort);
2161
if(ret >= 1){
2162
/* Add all found interfaces to interfaces list */
2163
for(int i = 0; i < ret; ++i){
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2165
direntries[i]->d_name);
2166
if(ret_errno != 0){
2167
perror_plus("argz_add");
2168
continue;
2169
}
2170
if(debug){
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2172
direntries[i]->d_name);
2173
}
2174
}
2175
free(direntries);
2176
} else {
2177
free(direntries);
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2179
exitcode = EXIT_FAILURE;
2180
goto end;
2181
}
2182
}
2183
2184
/* Bring up interfaces which are down */
2185
{
2186
char *interface = NULL;
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2188
interface))){
2189
/* If interface name is "none", stop bringing up interfaces.
2190
Also remove all instances of "none" from the list */
2191
if(strcmp(interface, "none") == 0){
2192
argz_delete(&mc.interfaces, &mc.interfaces_size,
2193
interface);
2194
interface = NULL;
2195
while((interface = argz_next(mc.interfaces,
2196
mc.interfaces_size, interface))){
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
2201
1949
}
2202
1950
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
2203
1968
break;
2204
1969
}
2205
bool interface_was_up = interface_is_up(interface);
2206
ret = bring_up_interface(interface, delay);
2207
if(not interface_was_up){
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2211
} else {
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2215
}
2216
}
2217
}
2218
if(debug and (interfaces_to_take_down == NULL)){
2219
fprintf_plus(stderr, "No interfaces were brought up\n");
2220
}
2221
}
2222
2223
/* If we only got one interface, explicitly use only that one */
2224
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2225
if(debug){
2226
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2227
mc.interfaces);
2228
}
2229
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
2230
1999
}
2231
2000
2232
2001
if(quit_now){
2233
2002
goto end;
2234
2003
}
2235
2004
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
2005
ret = init_gnutls_global(pubkey, seckey);
2237
2006
if(ret == -1){
2238
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2239
2008
exitcode = EX_UNAVAILABLE;
2256
2025
goto end;
2257
2026
}
2258
2027
2259
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2260
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2261
2030
exitcode = EX_UNAVAILABLE;
2262
2031
goto end;
2272
2041
/* Connect directly, do not use Zeroconf */
2273
2042
/* (Mainly meant for debugging) */
2274
2043
char *address = strrchr(connect_to, ':');
2275
2276
2044
if(address == NULL){
2277
2045
fprintf_plus(stderr, "No colon in address\n");
2278
2046
exitcode = EX_USAGE;
2283
2051
goto end;
2284
2052
}
2285
2053
2286
in_port_t port;
2054
uint16_t port;
2287
2055
errno = 0;
2288
2056
tmpmax = strtoimax(address+1, &tmp, 10);
2289
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2290
or tmpmax != (in_port_t)tmpmax){
2058
or tmpmax != (uint16_t)tmpmax){
2291
2059
fprintf_plus(stderr, "Bad port number\n");
2292
2060
exitcode = EX_USAGE;
2293
2061
goto end;
2294
2062
}
2295
2063
2296
2064
if(quit_now){
2297
2065
goto end;
2298
2066
}
2299
2067
2300
port = (in_port_t)tmpmax;
2068
port = (uint16_t)tmpmax;
2301
2069
*address = '\0';
2302
2070
/* Colon in address indicates IPv6 */
2303
2071
int af;
2319
2087
}
2320
2088
2321
2089
while(not quit_now){
2322
ret = start_mandos_communication(address, port, if_index, af,
2323
&mc);
2090
ret = start_mandos_communication(address, port, if_index, af);
2324
2091
if(quit_now or ret == 0){
2325
2092
break;
2326
2093
}
2352
2119
config.publish_domain = 0;
2353
2120
2354
2121
/* Allocate a new server */
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2356
&config, NULL, NULL, &ret_errno);
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2357
2125
2358
2126
/* Free the Avahi configuration data */
2359
2127
avahi_server_config_free(&config);
2362
2130
/* Check if creating the Avahi server object succeeded */
2363
2131
if(mc.server == NULL){
2364
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2365
avahi_strerror(ret_errno));
2133
avahi_strerror(error));
2366
2134
exitcode = EX_UNAVAILABLE;
2367
2135
goto end;
2368
2136
}
2374
2142
/* Create the Avahi service browser */
2375
2143
sb = avahi_s_service_browser_new(mc.server, if_index,
2376
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2377
NULL, 0, browse_callback,
2378
(void *)&mc);
2145
NULL, 0, browse_callback, NULL);
2379
2146
if(sb == NULL){
2380
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2381
2148
avahi_strerror(avahi_server_errno(mc.server)));
2393
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2394
2161
}
2395
2162
2396
ret = avahi_loop_with_timeout(simple_poll,
2397
(int)(retry_interval * 1000), &mc);
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2398
2165
if(debug){
2399
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2400
2167
(ret == 0) ? "successfully" : "with error");
2407
2174
}
2408
2175
2409
2176
/* Cleanup things */
2410
free(mc.interfaces);
2411
2412
2177
if(sb != NULL)
2413
2178
avahi_s_service_browser_free(sb);
2414
2179
2415
2180
if(mc.server != NULL)
2416
2181
avahi_server_free(mc.server);
2417
2182
2418
if(simple_poll != NULL)
2419
avahi_simple_poll_free(simple_poll);
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2420
2185
2421
2186
if(gnutls_initialized){
2422
2187
gnutls_certificate_free_credentials(mc.cred);
2427
2192
if(gpgme_initialized){
2428
2193
gpgme_release(mc.ctx);
2429
2194
}
2430
2195
2431
2196
/* Cleans up the circular linked list of Mandos servers the client
2432
2197
has seen */
2433
2198
if(mc.current_server != NULL){
2441
2206
2442
2207
/* Re-raise priviliges */
2443
2208
{
2444
raise_privileges();
2445
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2446
2214
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2449
2218
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2460
2229
}
2461
2230
}
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2465
2234
}
2466
2235
}
2467
2468
lower_privileges_permanently();
2469
}
2470
2471
free(interfaces_to_take_down);
2472
free(interfaces_hooks);
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2473
2243
2474
2244
/* Removes the GPGME temp directory and all files inside */
2475
2245
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0