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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 © 2008-2012 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 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);
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
739
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
704
-Wunreachable-code*/
765
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
766
729
perror_plus("if_indextoname");
767
730
} else {
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
770
733
}
771
734
} else {
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
774
737
}
775
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
854
817
goto mandos_end;
855
818
}
856
819
857
/* This casting via intptr_t is to eliminate warning about casting
858
an int to a pointer type. This is exactly how the GnuTLS Guile
859
function "set-session-transport-fd!" does it. */
860
gnutls_transport_set_ptr(session,
861
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
862
822
863
823
if(quit_now){
864
824
errno = EINTR;
969
929
if(buffer_length > 0){
970
930
ssize_t decrypted_buffer_size;
971
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
932
&decrypted_buffer);
973
933
if(decrypted_buffer_size >= 0){
974
934
975
935
written = 0;
1036
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
998
flags,
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1043
1001
1044
1002
/* Called whenever a service has been resolved successfully or
1045
1003
timed out */
1054
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1055
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1056
1014
domain,
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1059
1016
break;
1060
1017
1061
1018
case AVAHI_RESOLVER_FOUND:
1067
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1068
1025
host_name, ip, (intmax_t)interface, port);
1069
1026
}
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1074
1029
if(ret == 0){
1075
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1076
1031
} else {
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1080
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
" list\n", name);
1082
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1083
1034
}
1084
1035
}
1085
1036
}
1095
1046
const char *domain,
1096
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1048
flags,
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1102
1051
1103
1052
/* Called whenever a new services becomes available on the LAN or
1104
1053
is removed from the LAN */
1112
1061
case AVAHI_BROWSER_FAILURE:
1113
1062
1114
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1115
avahi_strerror(avahi_server_errno
1116
(((mandos_context*)mc)->server)));
1117
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1118
1066
return;
1119
1067
1120
1068
case AVAHI_BROWSER_NEW:
1123
1071
the callback function is called the Avahi server will free the
1124
1072
resolver for us. */
1125
1073
1126
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1127
interface, protocol, name, type,
1128
domain, protocol, 0,
1129
resolve_callback, mc) == NULL)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1130
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1131
1078
" %s\n", name,
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1134
1080
break;
1135
1081
1136
1082
case AVAHI_BROWSER_REMOVE:
1155
1101
signal_received = sig;
1156
1102
int old_errno = errno;
1157
1103
/* set main loop to exit */
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1160
1106
}
1161
1107
errno = old_errno;
1162
1108
}
1163
1109
1164
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1111
int ret;
1166
error_t ret_errno;
1167
1112
1168
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1114
if(s < 0){
1170
ret_errno = errno;
1171
1115
perror_plus("socket");
1172
errno = ret_errno;
1173
1116
return false;
1174
1117
}
1175
1118
strcpy(ifr->ifr_name, ifname);
1176
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1120
if(ret == -1){
1178
1121
if(debug){
1179
ret_errno = errno;
1180
1122
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1182
1123
}
1183
1124
return false;
1184
1125
}
1253
1194
}
1254
1195
1255
1196
/*
1256
* This function determines if a network interface is up.
1257
*/
1258
bool interface_is_up(const char *interface){
1259
struct ifreq ifr;
1260
if(not get_flags(interface, &ifr)){
1261
if(debug){
1262
fprintf_plus(stderr, "Failed to get flags for interface "
1263
"\"%s\"\n", interface);
1264
}
1265
return false;
1266
}
1267
1268
return (bool)(ifr.ifr_flags & IFF_UP);
1269
}
1270
1271
/*
1272
* This function determines if a network interface is running
1273
*/
1274
bool interface_is_running(const char *interface){
1275
struct ifreq ifr;
1276
if(not get_flags(interface, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", interface);
1280
}
1281
return false;
1282
}
1283
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
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;
1285
1237
}
1286
1238
1287
1239
int notdotentries(const struct dirent *direntry){
1349
1301
}
1350
1302
return 0;
1351
1303
}
1352
if(debug){
1353
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1354
direntry->d_name);
1355
}
1356
1304
return 1;
1357
1305
}
1358
1306
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1361
1308
int ret;
1362
1309
struct timespec now;
1363
1310
struct timespec waited_time;
1364
1311
intmax_t block_time;
1365
1312
1366
1313
while(true){
1367
if(mc->current_server == NULL){
1314
if(mc.current_server == NULL){
1368
1315
if (debug){
1369
1316
fprintf_plus(stderr, "Wait until first server is found."
1370
1317
" No timeout!\n");
1384
1331
/* Calculating in ms how long time between now and server
1385
1332
who we visted longest time ago. Now - last seen. */
1386
1333
waited_time.tv_sec = (now.tv_sec
1387
- mc->current_server->last_seen.tv_sec);
1334
- mc.current_server->last_seen.tv_sec);
1388
1335
waited_time.tv_nsec = (now.tv_nsec
1389
- mc->current_server->last_seen.tv_nsec);
1336
- mc.current_server->last_seen.tv_nsec);
1390
1337
/* total time is 10s/10,000ms.
1391
1338
Converting to s from ms by dividing by 1,000,
1392
1339
and ns to ms by dividing by 1,000,000. */
1400
1347
}
1401
1348
1402
1349
if(block_time <= 0){
1403
ret = start_mandos_communication(mc->current_server->ip,
1404
mc->current_server->port,
1405
mc->current_server->if_index,
1406
mc->current_server->af, mc);
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);
1407
1354
if(ret == 0){
1408
avahi_simple_poll_quit(s);
1355
avahi_simple_poll_quit(mc.simple_poll);
1409
1356
return 0;
1410
1357
}
1411
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1412
&mc->current_server->last_seen);
1359
&mc.current_server->last_seen);
1413
1360
if(ret == -1){
1414
1361
perror_plus("clock_gettime");
1415
1362
return -1;
1416
1363
}
1417
mc->current_server = mc->current_server->next;
1364
mc.current_server = mc.current_server->next;
1418
1365
block_time = 0; /* Call avahi to find new Mandos
1419
1366
servers, but don't block */
1420
1367
}
1429
1376
}
1430
1377
}
1431
1378
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
1379
bool run_network_hooks(const char *mode, const char *interface,
1485
1380
const float delay){
1486
1381
struct dirent **direntries;
1489
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
1385
alphasort);
1491
1386
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
1387
perror_plus("scandir");
1500
1388
} else {
1501
1389
int devnull = open("/dev/null", O_RDONLY);
1502
1390
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1391
direntry = direntries[0];
1504
1392
char *fullname = NULL;
1505
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
1394
if(ret < 0){
1507
1395
perror_plus("asprintf");
1508
1396
continue;
1509
1397
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
1398
pid_t hook_pid = fork();
1515
1399
if(hook_pid == 0){
1516
1400
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
1401
dup2(devnull, STDIN_FILENO);
1532
1402
close(devnull);
1533
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
1405
if(ret == -1){
1536
1406
perror_plus("setenv");
1537
_exit(EX_OSERR);
1407
return false;
1538
1408
}
1539
1409
ret = setenv("DEVICE", interface, 1);
1540
1410
if(ret == -1){
1541
1411
perror_plus("setenv");
1542
_exit(EX_OSERR);
1412
return false;
1543
1413
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1545
1415
if(ret == -1){
1546
1416
perror_plus("setenv");
1547
_exit(EX_OSERR);
1417
return false;
1548
1418
}
1549
1419
ret = setenv("MODE", mode, 1);
1550
1420
if(ret == -1){
1551
1421
perror_plus("setenv");
1552
_exit(EX_OSERR);
1422
return false;
1553
1423
}
1554
1424
char *delaystring;
1555
1425
ret = asprintf(&delaystring, "%f", delay);
1556
1426
if(ret == -1){
1557
1427
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1428
return false;
1559
1429
}
1560
1430
ret = setenv("DELAY", delaystring, 1);
1561
1431
if(ret == -1){
1562
1432
free(delaystring);
1563
1433
perror_plus("setenv");
1564
_exit(EX_OSERR);
1434
return false;
1565
1435
}
1566
1436
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1578
1439
} else {
1579
1440
int status;
1580
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1604
1465
}
1605
1466
}
1606
1467
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1468
if(quit_now){
1469
break;
1610
1470
}
1611
1471
}
1612
1472
close(devnull);
1614
1474
return true;
1615
1475
}
1616
1476
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1623
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1625
if(if_index == 0){
1626
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
errno = old_errno;
1628
return ENXIO;
1629
}
1630
1631
if(quit_now){
1632
errno = old_errno;
1633
return EINTR;
1634
}
1635
1636
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1638
ret_errno = errno;
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1640
"\"%s\"\n", interface);
1641
return ret_errno;
1642
}
1643
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1647
ret_errno = errno;
1648
perror_plus("socket");
1649
errno = old_errno;
1650
return ret_errno;
1651
}
1652
1653
if(quit_now){
1654
close(sd);
1655
errno = old_errno;
1656
return EINTR;
1657
}
1658
1659
if(debug){
1660
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
interface);
1662
}
1663
1664
/* Raise priviliges */
1665
raise_privileges();
1666
1667
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1675
}
1676
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret_linux = klogctl(7, NULL, 0);
1682
if(ret_linux == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
1688
/* Lower privileges */
1689
lower_privileges();
1690
1691
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1693
if(ret == -1){
1694
perror_plus("close");
1695
}
1696
1697
if(ret_setflags == -1){
1698
errno = ret_errno;
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
errno = old_errno;
1701
return ret_errno;
1702
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
}
1707
1708
/* Sleep checking until interface is running.
1709
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1712
break;
1713
}
1714
struct timespec sleeptime = { .tv_nsec = 250000000 };
1715
ret = nanosleep(&sleeptime, NULL);
1716
if(ret == -1 and errno != EINTR){
1717
perror_plus("nanosleep");
1718
}
1719
}
1720
1721
errno = old_errno;
1722
return 0;
1723
}
1724
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
if(interface_is_up(interface)){
1738
if(not get_flags(interface, &network) and debug){
1739
ret_errno = errno;
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
return ret_errno;
1743
}
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1748
ret_errno = errno;
1749
perror_plus("socket");
1750
errno = old_errno;
1751
return ret_errno;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
1767
1768
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
if(ret == -1){
1771
perror_plus("close");
1772
}
1773
1774
if(ret_setflags == -1){
1775
errno = ret_errno;
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
errno = old_errno;
1778
return ret_errno;
1779
}
1780
} else if(debug){
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1782
interface);
1783
}
1784
1785
errno = old_errno;
1786
return 0;
1787
}
1788
1789
1477
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
1794
1478
AvahiSServiceBrowser *sb = NULL;
1795
error_t ret_errno;
1479
int error;
1796
1480
int ret;
1797
1481
intmax_t tmpmax;
1798
1482
char *tmp;
1799
1483
int exitcode = EXIT_SUCCESS;
1800
char *interfaces_to_take_down = NULL;
1801
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;
1802
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1803
1491
bool tempdir_created = false;
1804
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
1493
const char *seckey = PATHDIR "/" SECKEY;
1806
1494
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1495
1810
1496
bool gnutls_initialized = false;
1811
1497
bool gpgme_initialized = false;
1873
1559
.group = 2 },
1874
1560
{ .name = "retry", .key = 132,
1875
1561
.arg = "SECONDS",
1876
.doc = "Retry interval used when denied by the Mandos server",
1562
.doc = "Retry interval used when denied by the mandos server",
1877
1563
.group = 2 },
1878
1564
{ .name = "network-hook-dir", .key = 133,
1879
1565
.arg = "DIR",
1902
1588
connect_to = arg;
1903
1589
break;
1904
1590
case 'i': /* --interface */
1905
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1906
arg, (int)',');
1907
if(ret_errno != 0){
1908
argp_error(state, "%s", strerror(ret_errno));
1909
}
1591
interface = arg;
1910
1592
break;
1911
1593
case 's': /* --seckey */
1912
1594
seckey = arg;
1955
1637
argp_state_help(state, state->out_stream,
1956
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1957
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1958
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1959
1643
exit(argp_err_exit_status);
1960
1644
break;
1988
1672
{
1989
1673
/* Work around Debian bug #633582:
1990
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
1991
1676
1992
1677
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
1994
struct stat st;
1995
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1997
int seckey_fd = open(seckey, O_RDONLY);
1998
if(seckey_fd == -1){
1999
perror_plus("open");
2000
} else {
2001
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2002
if(ret == -1){
2003
perror_plus("fstat");
2004
} else {
2005
if(S_ISREG(st.st_mode)
2006
and st.st_uid == 0 and st.st_gid == 0){
2007
ret = fchown(seckey_fd, uid, gid);
2008
if(ret == -1){
2009
perror_plus("fchown");
2010
}
2011
}
2012
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2014
}
2015
}
2016
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2019
if(pubkey_fd == -1){
2020
perror_plus("open");
2021
} else {
2022
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2023
if(ret == -1){
2024
perror_plus("fstat");
2025
} else {
2026
if(S_ISREG(st.st_mode)
2027
and st.st_uid == 0 and st.st_gid == 0){
2028
ret = fchown(pubkey_fd, uid, gid);
2029
if(ret == -1){
2030
perror_plus("fchown");
2031
}
2032
}
2033
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2038
/* Lower privileges */
2039
lower_privileges();
2040
}
2041
}
2042
2043
/* Remove invalid interface names (except "none") */
2044
{
2045
char *interface = NULL;
2046
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2047
interface))){
2048
if(strcmp(interface, "none") != 0
2049
and if_nametoindex(interface) == 0){
2050
if(interface[0] != '\0'){
2051
fprintf_plus(stderr, "Not using nonexisting interface"
2052
" \"%s\"\n", interface);
2053
}
2054
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2055
interface = NULL;
2056
}
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");
2057
1731
}
2058
1732
}
2059
1733
2060
1734
/* Run network hooks */
2061
1735
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
2066
goto end;
2067
}
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
2072
1741
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
1742
if(not run_network_hooks("start", interface, delay)){
2075
1743
goto end;
2076
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2077
1751
}
2078
1752
2079
1753
if(not debug){
2080
1754
avahi_set_log_function(empty_log);
2081
1755
}
2082
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
2083
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2084
1790
from the signal handler */
2085
1791
/* Initialize the pseudo-RNG for Avahi */
2086
1792
srand((unsigned int) time(NULL));
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2089
1795
fprintf_plus(stderr,
2090
1796
"Avahi: Failed to create simple poll object.\n");
2091
1797
exitcode = EX_UNAVAILABLE;
2155
1861
}
2156
1862
}
2157
1863
2158
/* If no interfaces were specified, make a list */
2159
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2161
/* Look for any good interfaces */
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2163
alphasort);
2164
if(ret >= 1){
2165
/* Add all found interfaces to interfaces list */
2166
for(int i = 0; i < ret; ++i){
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
direntries[i]->d_name);
2169
if(ret_errno != 0){
2170
perror_plus("argz_add");
2171
continue;
2172
}
2173
if(debug){
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
direntries[i]->d_name);
2176
}
2177
}
2178
free(direntries);
2179
} else {
2180
free(direntries);
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2182
exitcode = EXIT_FAILURE;
2183
goto end;
2184
}
2185
}
2186
2187
/* Bring up interfaces which are down, and remove any "none"s */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
/* If interface name is "none", stop bringing up interfaces.
2193
Also remove all instances of "none" from the list */
2194
if(strcmp(interface, "none") == 0){
2195
argz_delete(&mc.interfaces, &mc.interfaces_size,
2196
interface);
2197
interface = NULL;
2198
while((interface = argz_next(mc.interfaces,
2199
mc.interfaces_size, interface))){
2200
if(strcmp(interface, "none") == 0){
2201
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
interface);
2203
interface = NULL;
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");
2204
1949
}
2205
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){
2206
1968
break;
2207
1969
}
2208
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2210
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2214
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2218
}
2219
}
2220
}
2221
if(debug and (interfaces_to_take_down == NULL)){
2222
fprintf_plus(stderr, "No interfaces were brought up\n");
2223
}
2224
}
2225
2226
/* If we only got one interface, explicitly use only that one */
2227
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2228
if(debug){
2229
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2230
mc.interfaces);
2231
}
2232
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
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
}
2233
1999
}
2234
2000
2235
2001
if(quit_now){
2236
2002
goto end;
2237
2003
}
2238
2004
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2005
ret = init_gnutls_global(pubkey, seckey);
2240
2006
if(ret == -1){
2241
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
2008
exitcode = EX_UNAVAILABLE;
2259
2025
goto end;
2260
2026
}
2261
2027
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2263
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2264
2030
exitcode = EX_UNAVAILABLE;
2265
2031
goto end;
2275
2041
/* Connect directly, do not use Zeroconf */
2276
2042
/* (Mainly meant for debugging) */
2277
2043
char *address = strrchr(connect_to, ':');
2278
2279
2044
if(address == NULL){
2280
2045
fprintf_plus(stderr, "No colon in address\n");
2281
2046
exitcode = EX_USAGE;
2286
2051
goto end;
2287
2052
}
2288
2053
2289
in_port_t port;
2054
uint16_t port;
2290
2055
errno = 0;
2291
2056
tmpmax = strtoimax(address+1, &tmp, 10);
2292
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2293
or tmpmax != (in_port_t)tmpmax){
2058
or tmpmax != (uint16_t)tmpmax){
2294
2059
fprintf_plus(stderr, "Bad port number\n");
2295
2060
exitcode = EX_USAGE;
2296
2061
goto end;
2297
2062
}
2298
2063
2299
2064
if(quit_now){
2300
2065
goto end;
2301
2066
}
2302
2067
2303
port = (in_port_t)tmpmax;
2068
port = (uint16_t)tmpmax;
2304
2069
*address = '\0';
2305
2070
/* Colon in address indicates IPv6 */
2306
2071
int af;
2322
2087
}
2323
2088
2324
2089
while(not quit_now){
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2090
ret = start_mandos_communication(address, port, if_index, af);
2327
2091
if(quit_now or ret == 0){
2328
2092
break;
2329
2093
}
2355
2119
config.publish_domain = 0;
2356
2120
2357
2121
/* Allocate a new server */
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2360
2125
2361
2126
/* Free the Avahi configuration data */
2362
2127
avahi_server_config_free(&config);
2365
2130
/* Check if creating the Avahi server object succeeded */
2366
2131
if(mc.server == NULL){
2367
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2133
avahi_strerror(error));
2369
2134
exitcode = EX_UNAVAILABLE;
2370
2135
goto end;
2371
2136
}
2377
2142
/* Create the Avahi service browser */
2378
2143
sb = avahi_s_service_browser_new(mc.server, if_index,
2379
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2145
NULL, 0, browse_callback, NULL);
2382
2146
if(sb == NULL){
2383
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
2148
avahi_strerror(avahi_server_errno(mc.server)));
2396
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
2161
}
2398
2162
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2401
2165
if(debug){
2402
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
2167
(ret == 0) ? "successfully" : "with error");
2410
2174
}
2411
2175
2412
2176
/* Cleanup things */
2413
free(mc.interfaces);
2414
2415
2177
if(sb != NULL)
2416
2178
avahi_s_service_browser_free(sb);
2417
2179
2418
2180
if(mc.server != NULL)
2419
2181
avahi_server_free(mc.server);
2420
2182
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2423
2185
2424
2186
if(gnutls_initialized){
2425
2187
gnutls_certificate_free_credentials(mc.cred);
2430
2192
if(gpgme_initialized){
2431
2193
gpgme_release(mc.ctx);
2432
2194
}
2433
2195
2434
2196
/* Cleans up the circular linked list of Mandos servers the client
2435
2197
has seen */
2436
2198
if(mc.current_server != NULL){
2444
2206
2445
2207
/* Re-raise priviliges */
2446
2208
{
2447
raise_privileges();
2448
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2449
2214
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2452
2218
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
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");
2463
2229
}
2464
2230
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2468
2234
}
2469
2235
}
2470
2471
lower_privileges_permanently();
2472
}
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2476
2243
2477
2244
/* Removes the GPGME temp directory and all files inside */
2478
2245
if(tempdir_created){
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