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- Committer: Teddy Hogeborn
- Date: 2012-06-09 23:41:07 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120609234107-vm6zilzz0y6aihsm
* plugins.d/mandos-client.c (raise_privileges,
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
87
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
89
WEXITSTATUS(), WTERMSIG() */
89
90
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
91
95
92
#ifdef __linux__
96
93
#include <sys/klog.h> /* klogctl() */
144
141
/* Doubly linked list that need to be circularly linked when used */
145
142
typedef struct server{
146
143
const char *ip;
147
in_port_t port;
144
uint16_t port;
148
145
AvahiIfIndex if_index;
149
146
int af;
150
147
struct timespec last_seen;
154
151
155
152
/* Used for passing in values through the Avahi callback functions */
156
153
typedef struct {
154
AvahiSimplePoll *simple_poll;
157
155
AvahiServer *server;
158
156
gnutls_certificate_credentials_t cred;
159
157
unsigned int dh_bits;
161
159
const char *priority;
162
160
gpgme_ctx_t ctx;
163
161
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
162
} mandos_context;
167
163
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
170
169
171
170
sig_atomic_t quit_now = 0;
172
171
int signal_received = 0;
208
207
}
209
208
210
209
/* 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){
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
213
212
int ret;
214
213
server *new_server = malloc(sizeof(server));
215
214
if(new_server == NULL){
225
224
return false;
226
225
}
227
226
/* Special case of first server */
228
if(*current_server == NULL){
227
if (mc.current_server == NULL){
229
228
new_server->next = new_server;
230
229
new_server->prev = new_server;
231
*current_server = new_server;
230
mc.current_server = new_server;
232
231
/* Place the new server last in the list */
233
232
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
236
235
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
236
mc.current_server->prev = new_server;
238
237
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
239
if(ret == -1){
241
240
perror_plus("clock_gettime");
242
241
return false;
248
247
* Initialize GPGME.
249
248
*/
250
249
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
250
const char *tempdir){
252
251
gpgme_error_t rc;
253
252
gpgme_engine_info_t engine_info;
254
253
254
255
255
/*
256
256
* Helper function to insert pub and seckey to the engine keyring.
257
257
*/
273
273
return false;
274
274
}
275
275
276
rc = gpgme_op_import(mc->ctx, pgp_data);
276
rc = gpgme_op_import(mc.ctx, pgp_data);
277
277
if(rc != GPG_ERR_NO_ERROR){
278
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
279
gpgme_strsource(rc), gpgme_strerror(rc));
323
323
}
324
324
325
325
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
326
rc = gpgme_new(&(mc.ctx));
327
327
if(rc != GPG_ERR_NO_ERROR){
328
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
344
*/
345
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
346
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
347
char **plaintext){
349
348
gpgme_data_t dh_crypto, dh_plain;
350
349
gpgme_error_t rc;
351
350
ssize_t ret;
377
376
378
377
/* Decrypt data from the cryptotext data buffer to the plaintext
379
378
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
380
if(rc != GPG_ERR_NO_ERROR){
382
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
382
gpgme_strsource(rc), gpgme_strerror(rc));
384
383
plaintext_length = -1;
385
384
if(debug){
386
385
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
386
result = gpgme_op_decrypt_result(mc.ctx);
388
387
if(result == NULL){
389
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
389
} else {
468
467
}
469
468
470
469
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
472
472
if(ret == NULL)
473
473
ret = "(unknown)";
474
474
return ret;
481
481
}
482
482
483
483
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
484
const char *seckeyfilename){
486
485
int ret;
487
486
488
487
if(debug){
505
504
}
506
505
507
506
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
509
508
if(ret != GNUTLS_E_SUCCESS){
510
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
510
safer_gnutls_strerror(ret));
521
520
}
522
521
523
522
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
523
(mc.cred, pubkeyfilename, seckeyfilename,
525
524
GNUTLS_OPENPGP_FMT_BASE64);
526
525
if(ret != GNUTLS_E_SUCCESS){
527
526
fprintf_plus(stderr,
533
532
}
534
533
535
534
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
535
ret = gnutls_dh_params_init(&mc.dh_params);
537
536
if(ret != GNUTLS_E_SUCCESS){
538
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
538
" initialization: %s\n",
540
539
safer_gnutls_strerror(ret));
541
540
goto globalfail;
542
541
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
543
if(ret != GNUTLS_E_SUCCESS){
545
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
545
safer_gnutls_strerror(ret));
547
546
goto globalfail;
548
547
}
549
548
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
550
552
551
return 0;
553
552
554
553
globalfail:
555
554
556
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_certificate_free_credentials(mc.cred);
557
556
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
557
gnutls_dh_params_deinit(mc.dh_params);
559
558
return -1;
560
559
}
561
560
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
561
static int init_gnutls_session(gnutls_session_t *session){
564
562
int ret;
565
563
/* GnuTLS session creation */
566
564
do {
578
576
{
579
577
const char *err;
580
578
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
580
if(quit_now){
583
581
gnutls_deinit(*session);
584
582
return -1;
595
593
596
594
do {
597
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
596
mc.cred);
599
597
if(quit_now){
600
598
gnutls_deinit(*session);
601
599
return -1;
611
609
/* ignore client certificate if any. */
612
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
611
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
613
616
614
return 0;
617
615
}
621
619
__attribute__((unused)) const char *txt){}
622
620
623
621
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
622
static int start_mandos_communication(const char *ip, uint16_t port,
625
623
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
624
int af){
627
625
int ret, tcp_sd = -1;
628
626
ssize_t sret;
629
627
union {
659
657
return -1;
660
658
}
661
659
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);
660
ret = init_gnutls_session(&session);
695
661
if(ret != 0){
696
662
return -1;
697
663
}
698
664
699
665
if(debug){
700
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
667
PRIu16 "\n", ip, port);
702
668
}
703
669
704
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
735
701
goto mandos_end;
736
702
}
737
703
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
739
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
710
-Wunreachable-code*/
765
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
766
735
perror_plus("if_indextoname");
767
736
} else {
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
770
739
}
771
740
} else {
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
774
743
}
775
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
969
938
if(buffer_length > 0){
970
939
ssize_t decrypted_buffer_size;
971
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
941
&decrypted_buffer);
973
942
if(decrypted_buffer_size >= 0){
974
943
975
944
written = 0;
1036
1005
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1006
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1007
flags,
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
1008
AVAHI_GCC_UNUSED void* userdata){
1009
assert(r);
1043
1010
1044
1011
/* Called whenever a service has been resolved successfully or
1045
1012
timed out */
1054
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1055
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1056
1023
domain,
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
1024
avahi_strerror(avahi_server_errno(mc.server)));
1059
1025
break;
1060
1026
1061
1027
case AVAHI_RESOLVER_FOUND:
1067
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1068
1034
host_name, ip, (intmax_t)interface, port);
1069
1035
}
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1074
1038
if(ret == 0){
1075
avahi_simple_poll_quit(simple_poll);
1039
avahi_simple_poll_quit(mc.simple_poll);
1076
1040
} else {
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1080
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
1044
" list\n", name);
1082
1045
}
1095
1058
const char *domain,
1096
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1060
flags,
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1061
AVAHI_GCC_UNUSED void* userdata){
1062
assert(b);
1102
1063
1103
1064
/* Called whenever a new services becomes available on the LAN or
1104
1065
is removed from the LAN */
1112
1073
case AVAHI_BROWSER_FAILURE:
1113
1074
1114
1075
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);
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
1118
1078
return;
1119
1079
1120
1080
case AVAHI_BROWSER_NEW:
1123
1083
the callback function is called the Avahi server will free the
1124
1084
resolver for us. */
1125
1085
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)
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1130
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1131
1090
" %s\n", name,
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1091
avahi_strerror(avahi_server_errno(mc.server)));
1134
1092
break;
1135
1093
1136
1094
case AVAHI_BROWSER_REMOVE:
1155
1113
signal_received = sig;
1156
1114
int old_errno = errno;
1157
1115
/* set main loop to exit */
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1160
1118
}
1161
1119
errno = old_errno;
1162
1120
}
1163
1121
1164
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1123
int ret;
1166
error_t ret_errno;
1167
1124
1168
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1126
if(s < 0){
1170
ret_errno = errno;
1171
1127
perror_plus("socket");
1172
errno = ret_errno;
1173
1128
return false;
1174
1129
}
1175
1130
strcpy(ifr->ifr_name, ifname);
1176
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1132
if(ret == -1){
1178
1133
if(debug){
1179
ret_errno = errno;
1180
1134
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1182
1135
}
1183
1136
return false;
1184
1137
}
1253
1206
}
1254
1207
1255
1208
/*
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);
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1285
1249
}
1286
1250
1287
1251
int notdotentries(const struct dirent *direntry){
1356
1320
return 1;
1357
1321
}
1358
1322
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1361
1324
int ret;
1362
1325
struct timespec now;
1363
1326
struct timespec waited_time;
1364
1327
intmax_t block_time;
1365
1328
1366
1329
while(true){
1367
if(mc->current_server == NULL){
1330
if(mc.current_server == NULL){
1368
1331
if (debug){
1369
1332
fprintf_plus(stderr, "Wait until first server is found."
1370
1333
" No timeout!\n");
1384
1347
/* Calculating in ms how long time between now and server
1385
1348
who we visted longest time ago. Now - last seen. */
1386
1349
waited_time.tv_sec = (now.tv_sec
1387
- mc->current_server->last_seen.tv_sec);
1350
- mc.current_server->last_seen.tv_sec);
1388
1351
waited_time.tv_nsec = (now.tv_nsec
1389
- mc->current_server->last_seen.tv_nsec);
1352
- mc.current_server->last_seen.tv_nsec);
1390
1353
/* total time is 10s/10,000ms.
1391
1354
Converting to s from ms by dividing by 1,000,
1392
1355
and ns to ms by dividing by 1,000,000. */
1400
1363
}
1401
1364
1402
1365
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);
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1407
1370
if(ret == 0){
1408
avahi_simple_poll_quit(s);
1371
avahi_simple_poll_quit(mc.simple_poll);
1409
1372
return 0;
1410
1373
}
1411
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1412
&mc->current_server->last_seen);
1375
&mc.current_server->last_seen);
1413
1376
if(ret == -1){
1414
1377
perror_plus("clock_gettime");
1415
1378
return -1;
1416
1379
}
1417
mc->current_server = mc->current_server->next;
1380
mc.current_server = mc.current_server->next;
1418
1381
block_time = 0; /* Call avahi to find new Mandos
1419
1382
servers, but don't block */
1420
1383
}
1469
1432
return ret_errno;
1470
1433
}
1471
1434
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
1435
bool run_network_hooks(const char *mode, const char *interface,
1485
1436
const float delay){
1486
1437
struct dirent **direntries;
1489
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
1441
alphasort);
1491
1442
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
}
1443
perror_plus("scandir");
1500
1444
} else {
1501
1445
int devnull = open("/dev/null", O_RDONLY);
1502
1446
for(int i = 0; i < numhooks; i++){
1614
1558
return true;
1615
1559
}
1616
1560
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1561
int bring_up_interface(const char *const interface,
1562
const float delay){
1619
1563
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1564
int old_errno = errno;
1565
int ret_errno = 0;
1566
int ret;
1623
1567
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1625
1569
if(if_index == 0){
1626
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
1571
errno = old_errno;
1633
1577
return EINTR;
1634
1578
}
1635
1579
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
}
1580
/* Re-raise priviliges */
1581
raise_privileges();
1582
1583
#ifdef __linux__
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1588
if(ret == -1){
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1591
}
1592
#endif /* __linux__ */
1593
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
if(sd < 0){
1596
ret_errno = errno;
1597
perror_plus("socket");
1598
#ifdef __linux__
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1601
if(ret == -1){
1602
perror_plus("klogctl");
1603
}
1604
}
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1607
lower_privileges();
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1613
if(ret == -1){
1614
ret_errno = errno;
1615
perror_plus("ioctl SIOCGIFFLAGS");
1616
#ifdef __linux__
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1619
if(ret == -1){
1620
perror_plus("klogctl");
1621
}
1622
}
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1625
lower_privileges();
1626
errno = old_errno;
1627
return ret_errno;
1628
}
1629
if((network.ifr_flags & IFF_UP) == 0){
1643
1630
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1632
if(ret == -1){
1647
1633
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
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1635
#ifdef __linux__
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1638
if(ret == -1){
1639
perror_plus("klogctl");
1640
}
1641
}
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1644
lower_privileges();
1700
1645
errno = old_errno;
1701
1646
return ret_errno;
1702
1647
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
1648
}
1707
1708
1649
/* Sleep checking until interface is running.
1709
1650
Check every 0.25s, up to total time of delay */
1710
1651
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1653
if(ret == -1){
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
1712
1656
break;
1713
1657
}
1714
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
1717
1661
perror_plus("nanosleep");
1718
1662
}
1719
1663
}
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;
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
if(ret == -1){
1667
perror_plus("close");
1736
1668
}
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));
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1770
1673
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);
1674
perror_plus("klogctl");
1675
}
1783
1676
}
1784
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
lower_privileges();
1785
1680
errno = old_errno;
1786
1681
return 0;
1787
1682
}
1788
1683
1789
1684
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
1685
AvahiSServiceBrowser *sb = NULL;
1795
error_t ret_errno;
1686
int error;
1796
1687
int ret;
1797
1688
intmax_t tmpmax;
1798
1689
char *tmp;
1799
1690
int exitcode = EXIT_SUCCESS;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1691
const char *interface = "";
1692
struct ifreq network;
1693
int sd = -1;
1694
bool take_down_interface = false;
1802
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1803
1696
bool tempdir_created = false;
1804
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
1698
const char *seckey = PATHDIR "/" SECKEY;
1806
1699
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1700
1810
1701
bool gnutls_initialized = false;
1811
1702
bool gpgme_initialized = false;
1902
1793
connect_to = arg;
1903
1794
break;
1904
1795
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
}
1796
interface = arg;
1910
1797
break;
1911
1798
case 's': /* --seckey */
1912
1799
seckey = arg;
2036
1923
}
2037
1924
2038
1925
/* 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;
1926
errno = 0;
1927
ret = seteuid(uid);
1928
if(ret == -1){
1929
perror_plus("seteuid");
2056
1930
}
2057
1931
}
2058
1932
}
2059
1933
2060
1934
/* Run network hooks */
2061
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
1937
}
1938
1939
if(not debug){
1940
avahi_set_log_function(empty_log);
1941
}
1942
1943
if(interface[0] == '\0'){
1944
struct dirent **direntries;
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1947
alphasort);
1948
if(ret == 0){
1949
/* No up interfaces, look for any good interfaces */
1950
free(direntries);
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1952
alphasort);
1953
}
1954
if(ret >= 1){
1955
/* Pick the first interface returned */
1956
interface = strdup(direntries[0]->d_name);
1957
if(debug){
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1959
}
1960
if(interface == NULL){
2065
1961
perror_plus("malloc");
1962
free(direntries);
1963
exitcode = EXIT_FAILURE;
2066
1964
goto end;
2067
1965
}
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
1966
free(direntries);
1967
} else {
1968
free(direntries);
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1970
exitcode = EXIT_FAILURE;
2075
1971
goto end;
2076
1972
}
2077
1973
}
2078
1974
2079
if(not debug){
2080
avahi_set_log_function(empty_log);
2081
}
2082
2083
1975
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2084
1976
from the signal handler */
2085
1977
/* Initialize the pseudo-RNG for Avahi */
2086
1978
srand((unsigned int) time(NULL));
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
1979
mc.simple_poll = avahi_simple_poll_new();
1980
if(mc.simple_poll == NULL){
2089
1981
fprintf_plus(stderr,
2090
1982
"Avahi: Failed to create simple poll object.\n");
2091
1983
exitcode = EX_UNAVAILABLE;
2155
2047
}
2156
2048
}
2157
2049
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;
2204
}
2205
}
2206
break;
2207
}
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);
2050
/* If the interface is down, bring it up */
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2053
if(ret != 0){
2054
errno = ret;
2055
perror_plus("Failed to bring up interface");
2056
}
2233
2057
}
2234
2058
2235
2059
if(quit_now){
2236
2060
goto end;
2237
2061
}
2238
2062
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2063
ret = init_gnutls_global(pubkey, seckey);
2240
2064
if(ret == -1){
2241
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
2066
exitcode = EX_UNAVAILABLE;
2259
2083
goto end;
2260
2084
}
2261
2085
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
2263
2087
fprintf_plus(stderr, "init_gpgme failed\n");
2264
2088
exitcode = EX_UNAVAILABLE;
2265
2089
goto end;
2286
2110
goto end;
2287
2111
}
2288
2112
2289
in_port_t port;
2113
uint16_t port;
2290
2114
errno = 0;
2291
2115
tmpmax = strtoimax(address+1, &tmp, 10);
2292
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2293
or tmpmax != (in_port_t)tmpmax){
2117
or tmpmax != (uint16_t)tmpmax){
2294
2118
fprintf_plus(stderr, "Bad port number\n");
2295
2119
exitcode = EX_USAGE;
2296
2120
goto end;
2297
2121
}
2298
2122
2299
2123
if(quit_now){
2300
2124
goto end;
2301
2125
}
2302
2126
2303
port = (in_port_t)tmpmax;
2127
port = (uint16_t)tmpmax;
2304
2128
*address = '\0';
2305
2129
/* Colon in address indicates IPv6 */
2306
2130
int af;
2322
2146
}
2323
2147
2324
2148
while(not quit_now){
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2149
ret = start_mandos_communication(address, port, if_index, af);
2327
2150
if(quit_now or ret == 0){
2328
2151
break;
2329
2152
}
2355
2178
config.publish_domain = 0;
2356
2179
2357
2180
/* Allocate a new server */
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2181
mc.server = avahi_server_new(avahi_simple_poll_get
2182
(mc.simple_poll), &config, NULL,
2183
NULL, &error);
2360
2184
2361
2185
/* Free the Avahi configuration data */
2362
2186
avahi_server_config_free(&config);
2365
2189
/* Check if creating the Avahi server object succeeded */
2366
2190
if(mc.server == NULL){
2367
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2192
avahi_strerror(error));
2369
2193
exitcode = EX_UNAVAILABLE;
2370
2194
goto end;
2371
2195
}
2377
2201
/* Create the Avahi service browser */
2378
2202
sb = avahi_s_service_browser_new(mc.server, if_index,
2379
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2204
NULL, 0, browse_callback, NULL);
2382
2205
if(sb == NULL){
2383
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
2207
avahi_strerror(avahi_server_errno(mc.server)));
2396
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
2220
}
2398
2221
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2223
(int)(retry_interval * 1000));
2401
2224
if(debug){
2402
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
2226
(ret == 0) ? "successfully" : "with error");
2410
2233
}
2411
2234
2412
2235
/* Cleanup things */
2413
free(mc.interfaces);
2414
2415
2236
if(sb != NULL)
2416
2237
avahi_s_service_browser_free(sb);
2417
2238
2418
2239
if(mc.server != NULL)
2419
2240
avahi_server_free(mc.server);
2420
2241
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2242
if(mc.simple_poll != NULL)
2243
avahi_simple_poll_free(mc.simple_poll);
2423
2244
2424
2245
if(gnutls_initialized){
2425
2246
gnutls_certificate_free_credentials(mc.cred);
2442
2263
}
2443
2264
}
2444
2265
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2268
2445
2269
/* Re-raise priviliges */
2446
2270
{
2447
2271
raise_privileges();
2448
2272
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2276
if(ret == -1){
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2280
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2281
if(ret == -1){
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2463
2283
}
2464
2284
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2285
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
if(ret == -1){
2287
perror_plus("close");
2468
2288
}
2469
2289
}
2470
2471
lower_privileges_permanently();
2472
}
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2290
}
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
2476
2297
2477
2298
/* Removes the GPGME temp directory and all files inside */
2478
2299
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0