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- 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 © 2008-2013 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() */
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);
187
180
188
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
182
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
184
}
192
185
193
186
/*
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 the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
654
ret = init_gnutls_session(&session);
695
655
if(ret != 0){
696
656
return -1;
697
657
}
698
658
699
659
if(debug){
700
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
702
662
}
703
663
704
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
735
695
goto mandos_end;
736
696
}
737
697
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
743
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
748
705
if(if_index == AVAHI_IF_UNSPEC){
749
706
fprintf_plus(stderr, "An IPv6 link-local address is"
750
707
" incomplete without a network interface\n");
755
712
to.in6.sin6_scope_id = (uint32_t)if_index;
756
713
}
757
714
} else {
758
to.in.sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
759
718
}
760
719
761
720
if(quit_now){
769
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
770
729
perror_plus("if_indextoname");
771
730
} else {
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
774
733
}
775
734
} else {
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
778
737
}
779
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
858
817
goto mandos_end;
859
818
}
860
819
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
866
822
867
823
if(quit_now){
868
824
errno = EINTR;
973
929
if(buffer_length > 0){
974
930
ssize_t decrypted_buffer_size;
975
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
932
&decrypted_buffer);
977
933
if(decrypted_buffer_size >= 0){
978
934
979
935
written = 0;
1040
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1042
998
flags,
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1047
1001
1048
1002
/* Called whenever a service has been resolved successfully or
1049
1003
timed out */
1058
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
1014
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1063
1016
break;
1064
1017
1065
1018
case AVAHI_RESOLVER_FOUND:
1071
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
1025
host_name, ip, (intmax_t)interface, port);
1073
1026
}
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1078
1029
if(ret == 0){
1079
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1080
1031
} else {
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1087
1034
}
1088
1035
}
1089
1036
}
1099
1046
const char *domain,
1100
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1101
1048
flags,
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1106
1051
1107
1052
/* Called whenever a new services becomes available on the LAN or
1108
1053
is removed from the LAN */
1116
1061
case AVAHI_BROWSER_FAILURE:
1117
1062
1118
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1122
1066
return;
1123
1067
1124
1068
case AVAHI_BROWSER_NEW:
1127
1071
the callback function is called the Avahi server will free the
1128
1072
resolver for us. */
1129
1073
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1134
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
1078
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1138
1080
break;
1139
1081
1140
1082
case AVAHI_BROWSER_REMOVE:
1159
1101
signal_received = sig;
1160
1102
int old_errno = errno;
1161
1103
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1164
1106
}
1165
1107
errno = old_errno;
1166
1108
}
1167
1109
1168
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
1111
int ret;
1170
error_t ret_errno;
1171
1112
1172
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
1114
if(s < 0){
1174
ret_errno = errno;
1175
1115
perror_plus("socket");
1176
errno = ret_errno;
1177
1116
return false;
1178
1117
}
1179
1118
strcpy(ifr->ifr_name, ifname);
1180
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
1120
if(ret == -1){
1182
1121
if(debug){
1183
ret_errno = errno;
1184
1122
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
1123
}
1187
1124
return false;
1188
1125
}
1257
1194
}
1258
1195
1259
1196
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
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;
1289
1237
}
1290
1238
1291
1239
int notdotentries(const struct dirent *direntry){
1353
1301
}
1354
1302
return 0;
1355
1303
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1360
1304
return 1;
1361
1305
}
1362
1306
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1365
1308
int ret;
1366
1309
struct timespec now;
1367
1310
struct timespec waited_time;
1368
1311
intmax_t block_time;
1369
1312
1370
1313
while(true){
1371
if(mc->current_server == NULL){
1314
if(mc.current_server == NULL){
1372
1315
if (debug){
1373
1316
fprintf_plus(stderr, "Wait until first server is found."
1374
1317
" No timeout!\n");
1388
1331
/* Calculating in ms how long time between now and server
1389
1332
who we visted longest time ago. Now - last seen. */
1390
1333
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1334
- mc.current_server->last_seen.tv_sec);
1392
1335
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1336
- mc.current_server->last_seen.tv_nsec);
1394
1337
/* total time is 10s/10,000ms.
1395
1338
Converting to s from ms by dividing by 1,000,
1396
1339
and ns to ms by dividing by 1,000,000. */
1404
1347
}
1405
1348
1406
1349
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
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);
1411
1354
if(ret == 0){
1412
avahi_simple_poll_quit(s);
1355
avahi_simple_poll_quit(mc.simple_poll);
1413
1356
return 0;
1414
1357
}
1415
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1359
&mc.current_server->last_seen);
1417
1360
if(ret == -1){
1418
1361
perror_plus("clock_gettime");
1419
1362
return -1;
1420
1363
}
1421
mc->current_server = mc->current_server->next;
1364
mc.current_server = mc.current_server->next;
1422
1365
block_time = 0; /* Call avahi to find new Mandos
1423
1366
servers, but don't block */
1424
1367
}
1433
1376
}
1434
1377
}
1435
1378
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
1379
bool run_network_hooks(const char *mode, const char *interface,
1489
1380
const float delay){
1490
1381
struct dirent **direntries;
1493
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
1385
alphasort);
1495
1386
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1387
perror_plus("scandir");
1504
1388
} else {
1505
1389
int devnull = open("/dev/null", O_RDONLY);
1506
1390
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1391
direntry = direntries[0];
1508
1392
char *fullname = NULL;
1509
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
1394
if(ret < 0){
1511
1395
perror_plus("asprintf");
1512
1396
continue;
1513
1397
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
1398
pid_t hook_pid = fork();
1519
1399
if(hook_pid == 0){
1520
1400
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
1401
dup2(devnull, STDIN_FILENO);
1536
1402
close(devnull);
1537
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
1405
if(ret == -1){
1540
1406
perror_plus("setenv");
1541
_exit(EX_OSERR);
1407
return false;
1542
1408
}
1543
1409
ret = setenv("DEVICE", interface, 1);
1544
1410
if(ret == -1){
1545
1411
perror_plus("setenv");
1546
_exit(EX_OSERR);
1412
return false;
1547
1413
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1549
1415
if(ret == -1){
1550
1416
perror_plus("setenv");
1551
_exit(EX_OSERR);
1417
return false;
1552
1418
}
1553
1419
ret = setenv("MODE", mode, 1);
1554
1420
if(ret == -1){
1555
1421
perror_plus("setenv");
1556
_exit(EX_OSERR);
1422
return false;
1557
1423
}
1558
1424
char *delaystring;
1559
1425
ret = asprintf(&delaystring, "%f", delay);
1560
1426
if(ret == -1){
1561
1427
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1428
return false;
1563
1429
}
1564
1430
ret = setenv("DELAY", delaystring, 1);
1565
1431
if(ret == -1){
1566
1432
free(delaystring);
1567
1433
perror_plus("setenv");
1568
_exit(EX_OSERR);
1434
return false;
1569
1435
}
1570
1436
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1582
1439
} else {
1583
1440
int status;
1584
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1608
1465
}
1609
1466
}
1610
1467
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1468
if(quit_now){
1469
break;
1614
1470
}
1615
1471
}
1616
1472
close(devnull);
1618
1474
return true;
1619
1475
}
1620
1476
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1793
1477
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1798
1478
AvahiSServiceBrowser *sb = NULL;
1799
error_t ret_errno;
1479
int error;
1800
1480
int ret;
1801
1481
intmax_t tmpmax;
1802
1482
char *tmp;
1803
1483
int exitcode = EXIT_SUCCESS;
1804
char *interfaces_to_take_down = NULL;
1805
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;
1806
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1807
1491
bool tempdir_created = false;
1808
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
1493
const char *seckey = PATHDIR "/" SECKEY;
1810
1494
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1813
1495
1814
1496
bool gnutls_initialized = false;
1815
1497
bool gpgme_initialized = false;
1877
1559
.group = 2 },
1878
1560
{ .name = "retry", .key = 132,
1879
1561
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1562
.doc = "Retry interval used when denied by the mandos server",
1881
1563
.group = 2 },
1882
1564
{ .name = "network-hook-dir", .key = 133,
1883
1565
.arg = "DIR",
1906
1588
connect_to = arg;
1907
1589
break;
1908
1590
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1591
interface = arg;
1914
1592
break;
1915
1593
case 's': /* --seckey */
1916
1594
seckey = arg;
1959
1637
argp_state_help(state, state->out_stream,
1960
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1962
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
1643
exit(argp_err_exit_status);
1964
1644
break;
1992
1672
{
1993
1673
/* Work around Debian bug #633582:
1994
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
1995
1676
1996
1677
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
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");
2061
1731
}
2062
1732
}
2063
1733
2064
1734
/* Run network hooks */
2065
1735
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
2076
1741
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
1742
if(not run_network_hooks("start", interface, delay)){
2079
1743
goto end;
2080
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2081
1751
}
2082
1752
2083
1753
if(not debug){
2084
1754
avahi_set_log_function(empty_log);
2085
1755
}
2086
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
2087
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1790
from the signal handler */
2089
1791
/* Initialize the pseudo-RNG for Avahi */
2090
1792
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2093
1795
fprintf_plus(stderr,
2094
1796
"Avahi: Failed to create simple poll object.\n");
2095
1797
exitcode = EX_UNAVAILABLE;
2159
1861
}
2160
1862
}
2161
1863
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
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");
2208
1949
}
2209
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){
2210
1968
break;
2211
1969
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
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
}
2237
1999
}
2238
2000
2239
2001
if(quit_now){
2240
2002
goto end;
2241
2003
}
2242
2004
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
2005
ret = init_gnutls_global(pubkey, seckey);
2244
2006
if(ret == -1){
2245
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2246
2008
exitcode = EX_UNAVAILABLE;
2263
2025
goto end;
2264
2026
}
2265
2027
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2267
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2268
2030
exitcode = EX_UNAVAILABLE;
2269
2031
goto end;
2279
2041
/* Connect directly, do not use Zeroconf */
2280
2042
/* (Mainly meant for debugging) */
2281
2043
char *address = strrchr(connect_to, ':');
2282
2283
2044
if(address == NULL){
2284
2045
fprintf_plus(stderr, "No colon in address\n");
2285
2046
exitcode = EX_USAGE;
2290
2051
goto end;
2291
2052
}
2292
2053
2293
in_port_t port;
2054
uint16_t port;
2294
2055
errno = 0;
2295
2056
tmpmax = strtoimax(address+1, &tmp, 10);
2296
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2297
or tmpmax != (in_port_t)tmpmax){
2058
or tmpmax != (uint16_t)tmpmax){
2298
2059
fprintf_plus(stderr, "Bad port number\n");
2299
2060
exitcode = EX_USAGE;
2300
2061
goto end;
2301
2062
}
2302
2063
2303
2064
if(quit_now){
2304
2065
goto end;
2305
2066
}
2306
2067
2307
port = (in_port_t)tmpmax;
2068
port = (uint16_t)tmpmax;
2308
2069
*address = '\0';
2309
2070
/* Colon in address indicates IPv6 */
2310
2071
int af;
2326
2087
}
2327
2088
2328
2089
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
2090
ret = start_mandos_communication(address, port, if_index, af);
2331
2091
if(quit_now or ret == 0){
2332
2092
break;
2333
2093
}
2335
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
2096
(int)retry_interval);
2337
2097
}
2338
sleep((unsigned int)retry_interval);
2098
sleep((int)retry_interval);
2339
2099
}
2340
2100
2341
2101
if (not quit_now){
2359
2119
config.publish_domain = 0;
2360
2120
2361
2121
/* Allocate a new server */
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2364
2125
2365
2126
/* Free the Avahi configuration data */
2366
2127
avahi_server_config_free(&config);
2369
2130
/* Check if creating the Avahi server object succeeded */
2370
2131
if(mc.server == NULL){
2371
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
2133
avahi_strerror(error));
2373
2134
exitcode = EX_UNAVAILABLE;
2374
2135
goto end;
2375
2136
}
2381
2142
/* Create the Avahi service browser */
2382
2143
sb = avahi_s_service_browser_new(mc.server, if_index,
2383
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
2145
NULL, 0, browse_callback, NULL);
2386
2146
if(sb == NULL){
2387
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
2148
avahi_strerror(avahi_server_errno(mc.server)));
2400
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2401
2161
}
2402
2162
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2405
2165
if(debug){
2406
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
2167
(ret == 0) ? "successfully" : "with error");
2414
2174
}
2415
2175
2416
2176
/* Cleanup things */
2417
free(mc.interfaces);
2418
2419
2177
if(sb != NULL)
2420
2178
avahi_s_service_browser_free(sb);
2421
2179
2422
2180
if(mc.server != NULL)
2423
2181
avahi_server_free(mc.server);
2424
2182
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2427
2185
2428
2186
if(gnutls_initialized){
2429
2187
gnutls_certificate_free_credentials(mc.cred);
2434
2192
if(gpgme_initialized){
2435
2193
gpgme_release(mc.ctx);
2436
2194
}
2437
2195
2438
2196
/* Cleans up the circular linked list of Mandos servers the client
2439
2197
has seen */
2440
2198
if(mc.current_server != NULL){
2448
2206
2449
2207
/* Re-raise priviliges */
2450
2208
{
2451
raise_privileges();
2452
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2453
2214
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2456
2218
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
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");
2467
2229
}
2468
2230
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2472
2234
}
2473
2235
}
2474
2475
lower_privileges_permanently();
2476
}
2477
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2480
2243
2481
2244
/* Removes the GPGME temp directory and all files inside */
2482
2245
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0