To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 237.4.20
- compare with another revision
- download diff
- download tarball
- view history from revision 237.4.20
- Committer: Björn Påhlsson
- Date: 2011-10-15 16:48:03 UTC
- mto: (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 518.
- Revision ID: belorn@fukt.bsnet.se-20111015164803-61q3hzrv91d042mb
Tags: version-1.4.1-1
* Makefile (version): Changed to "1.4.1".
* NEWS (Version 1.4.1): New entry.
* debian/changelog (1.4.1-1): - '' -
* NEWS (Version 1.4.1): New entry.
* debian/changelog (1.4.1-1): - '' -
- files added:
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
76
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
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
79
80
argp_state, struct argp,
126
127
bool debug = false;
127
128
static const char mandos_protocol_version[] = "1";
128
129
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
131
static const char sys_class_net[] = "/sys/class/net";
131
132
char *connect_to = NULL;
132
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
144
133
145
/* Used for passing in values through the Avahi callback functions */
134
146
typedef struct {
135
147
AvahiSimplePoll *simple_poll;
139
151
gnutls_dh_params_t dh_params;
140
152
const char *priority;
141
153
gpgme_ctx_t ctx;
154
server *current_server;
142
155
} mandos_context;
143
156
144
157
/* global context so signal handler can reach it*/
145
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
159
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
148
162
149
163
sig_atomic_t quit_now = 0;
150
164
int signal_received = 0;
151
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
152
173
/*
153
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
175
* bytes. "buffer_capacity" is how much is currently allocated,
166
187
return buffer_capacity;
167
188
}
168
189
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
169
228
/*
170
229
* Initialize GPGME.
171
230
*/
185
244
186
245
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
246
if(fd == -1){
188
perror("open");
247
perror_plus("open");
189
248
return false;
190
249
}
191
250
205
264
206
265
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
266
if(ret == -1){
208
perror("close");
267
perror_plus("close");
209
268
}
210
269
gpgme_data_release(pgp_data);
211
270
return true;
224
283
return false;
225
284
}
226
285
227
/* Set GPGME home directory for the OpenPGP engine only */
286
/* Set GPGME home directory for the OpenPGP engine only */
228
287
rc = gpgme_get_engine_info(&engine_info);
229
288
if(rc != GPG_ERR_NO_ERROR){
230
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
336
395
337
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
397
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
398
perror_plus("gpgme_data_seek");
340
399
plaintext_length = -1;
341
400
goto decrypt_end;
342
401
}
347
406
(size_t)plaintext_length,
348
407
plaintext_capacity);
349
408
if(plaintext_capacity == 0){
350
perror("incbuffer");
409
perror_plus("incbuffer");
351
410
plaintext_length = -1;
352
411
goto decrypt_end;
353
412
}
360
419
break;
361
420
}
362
421
if(ret < 0){
363
perror("gpgme_data_read");
422
perror_plus("gpgme_data_read");
364
423
plaintext_length = -1;
365
424
goto decrypt_end;
366
425
}
423
482
}
424
483
425
484
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
486
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
487
fprintf(stderr, "GnuTLS memory error: %s\n",
432
488
safer_gnutls_strerror(ret));
433
489
gnutls_global_deinit();
434
490
return -1;
589
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
646
if(tcp_sd < 0){
591
647
int e = errno;
592
perror("socket");
648
perror_plus("socket");
593
649
errno = e;
594
650
goto mandos_end;
595
651
}
609
665
}
610
666
if(ret < 0 ){
611
667
int e = errno;
612
perror("inet_pton");
668
perror_plus("inet_pton");
613
669
errno = e;
614
670
goto mandos_end;
615
671
}
651
707
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
708
char interface[IF_NAMESIZE];
653
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
710
perror_plus("if_indextoname");
655
711
} else {
656
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
713
ip, interface, port);
671
727
sizeof(addrstr));
672
728
}
673
729
if(pcret == NULL){
674
perror("inet_ntop");
730
perror_plus("inet_ntop");
675
731
} else {
676
732
if(strcmp(addrstr, ip) != 0){
677
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
690
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
747
}
692
748
if(ret < 0){
693
int e = errno;
694
perror("connect");
695
errno = e;
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
696
754
goto mandos_end;
697
755
}
698
756
709
767
out_size - written));
710
768
if(ret == -1){
711
769
int e = errno;
712
perror("write");
770
perror_plus("write");
713
771
errno = e;
714
772
goto mandos_end;
715
773
}
740
798
goto mandos_end;
741
799
}
742
800
801
/* Spurious warning from -Wint-to-pointer-cast */
743
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
744
803
745
804
if(quit_now){
782
841
buffer_capacity);
783
842
if(buffer_capacity == 0){
784
843
int e = errno;
785
perror("incbuffer");
844
perror_plus("incbuffer");
786
845
errno = e;
787
846
goto mandos_end;
788
847
}
893
952
if(e == 0){
894
953
e = errno;
895
954
}
896
perror("close");
955
perror_plus("close");
897
956
}
898
957
gnutls_deinit(session);
958
errno = e;
899
959
if(quit_now){
900
e = EINTR;
960
errno = EINTR;
901
961
retval = -1;
902
962
}
903
errno = e;
904
963
}
905
964
return retval;
906
965
}
949
1008
avahi_proto_to_af(proto));
950
1009
if(ret == 0){
951
1010
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
952
1014
}
953
1015
}
954
1016
}
1008
1070
}
1009
1071
}
1010
1072
1011
/* stop main loop after sigterm has been called */
1073
/* Signal handler that stops main loop after SIGTERM */
1012
1074
static void handle_sigterm(int sig){
1013
1075
if(quit_now){
1014
1076
return;
1016
1078
quit_now = 1;
1017
1079
signal_received = sig;
1018
1080
int old_errno = errno;
1081
/* set main loop to exit */
1019
1082
if(mc.simple_poll != NULL){
1020
1083
avahi_simple_poll_quit(mc.simple_poll);
1021
1084
}
1030
1093
int good_interface(const struct dirent *if_entry){
1031
1094
ssize_t ssret;
1032
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1033
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
1100
if_entry->d_name);
1035
1101
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1102
perror_plus("asprintf");
1040
1103
return 0;
1041
1104
}
1042
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
1106
if(flags_fd == -1){
1044
perror("open");
1107
perror_plus("open");
1108
free(flagname);
1045
1109
return 0;
1046
1110
}
1111
free(flagname);
1047
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
1113
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1050
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
1116
flagstring[(size_t)to_read] = '\0';
1052
1117
if(flagstring == NULL){
1053
perror("malloc");
1118
perror_plus("malloc");
1054
1119
close(flags_fd);
1055
1120
return 0;
1056
1121
}
1058
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
1124
(size_t)to_read));
1060
1125
if(ssret == -1){
1061
perror("read");
1126
perror_plus("read");
1062
1127
free(flagstring);
1063
1128
close(flags_fd);
1064
1129
return 0;
1109
1174
}
1110
1175
return 0;
1111
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1112
1185
/* Accept this device */
1113
1186
if(debug){
1114
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
1190
return 1;
1118
1191
}
1119
1192
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1199
return 0;
1200
}
1201
return 1;
1202
}
1203
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
int ret;
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1209
1210
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1215
}
1216
ret = avahi_simple_poll_iterate(s, -1);
1217
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1221
}
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
if(ret == -1){
1225
perror_plus("clock_gettime");
1226
return -1;
1227
}
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1232
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1234
/* total time is 10s/10,000ms.
1235
Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1243
}
1244
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1250
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1252
return 0;
1253
}
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1256
if(ret == -1){
1257
perror_plus("clock_gettime");
1258
return -1;
1259
}
1260
mc.current_server = mc.current_server->next;
1261
block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
1263
}
1264
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
}
1267
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
1270
}
1271
}
1272
}
1273
}
1274
1120
1275
int main(int argc, char *argv[]){
1121
1276
AvahiSServiceBrowser *sb = NULL;
1122
1277
int error;
1139
1294
bool gnutls_initialized = false;
1140
1295
bool gpgme_initialized = false;
1141
1296
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1142
1299
1143
1300
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
1301
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1150
1307
errno = 0;
1151
1308
ret = setgid(gid);
1152
1309
if(ret == -1){
1153
perror("setgid");
1310
perror_plus("setgid");
1154
1311
}
1155
1312
1156
1313
/* Lower user privileges (temporarily) */
1157
1314
errno = 0;
1158
1315
ret = seteuid(uid);
1159
1316
if(ret == -1){
1160
perror("seteuid");
1317
perror_plus("seteuid");
1161
1318
}
1162
1319
1163
1320
if(quit_now){
1198
1355
.arg = "SECONDS",
1199
1356
.doc = "Maximum delay to wait for interface startup",
1200
1357
.group = 2 },
1358
{ .name = "retry", .key = 132,
1359
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1361
.group = 2 },
1201
1362
/*
1202
1363
* These reproduce what we would get without ARGP_NO_HELP
1203
1364
*/
1247
1408
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
1409
argp_error(state, "Bad delay");
1249
1410
}
1411
case 132: /* --retry */
1412
errno = 0;
1413
retry_interval = strtod(arg, &tmp);
1414
if(errno != 0 or tmp == arg or *tmp != '\0'
1415
or (retry_interval * 1000) > INT_MAX
1416
or retry_interval < 0){
1417
argp_error(state, "Bad retry interval");
1418
}
1250
1419
break;
1251
1420
/*
1252
1421
* These reproduce what we would get without ARGP_NO_HELP
1280
1449
case ENOMEM:
1281
1450
default:
1282
1451
errno = ret;
1283
perror("argp_parse");
1452
perror_plus("argp_parse");
1284
1453
exitcode = EX_OSERR;
1285
1454
goto end;
1286
1455
case EINVAL:
1288
1457
goto end;
1289
1458
}
1290
1459
}
1460
1461
{
1462
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
1519
}
1291
1520
1292
1521
if(not debug){
1293
1522
avahi_set_log_function(empty_log);
1304
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
1534
}
1306
1535
if(interface == NULL){
1307
perror("malloc");
1536
perror_plus("malloc");
1308
1537
free(direntries);
1309
1538
exitcode = EXIT_FAILURE;
1310
1539
goto end;
1332
1561
sigemptyset(&sigterm_action.sa_mask);
1333
1562
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
1563
if(ret == -1){
1335
perror("sigaddset");
1564
perror_plus("sigaddset");
1336
1565
exitcode = EX_OSERR;
1337
1566
goto end;
1338
1567
}
1339
1568
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
1569
if(ret == -1){
1341
perror("sigaddset");
1570
perror_plus("sigaddset");
1342
1571
exitcode = EX_OSERR;
1343
1572
goto end;
1344
1573
}
1345
1574
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
1575
if(ret == -1){
1347
perror("sigaddset");
1576
perror_plus("sigaddset");
1348
1577
exitcode = EX_OSERR;
1349
1578
goto end;
1350
1579
}
1354
1583
*/
1355
1584
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
1585
if(ret == -1){
1357
perror("sigaction");
1586
perror_plus("sigaction");
1358
1587
return EX_OSERR;
1359
1588
}
1360
1589
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
1590
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
1591
if(ret == -1){
1363
perror("sigaction");
1592
perror_plus("sigaction");
1364
1593
exitcode = EX_OSERR;
1365
1594
goto end;
1366
1595
}
1367
1596
}
1368
1597
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
1598
if(ret == -1){
1370
perror("sigaction");
1599
perror_plus("sigaction");
1371
1600
return EX_OSERR;
1372
1601
}
1373
1602
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
1603
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
1604
if(ret == -1){
1376
perror("sigaction");
1605
perror_plus("sigaction");
1377
1606
exitcode = EX_OSERR;
1378
1607
goto end;
1379
1608
}
1380
1609
}
1381
1610
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
1611
if(ret == -1){
1383
perror("sigaction");
1612
perror_plus("sigaction");
1384
1613
return EX_OSERR;
1385
1614
}
1386
1615
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
1616
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
1617
if(ret == -1){
1389
perror("sigaction");
1618
perror_plus("sigaction");
1390
1619
exitcode = EX_OSERR;
1391
1620
goto end;
1392
1621
}
1409
1638
errno = 0;
1410
1639
ret = seteuid(0);
1411
1640
if(ret == -1){
1412
perror("seteuid");
1641
perror_plus("seteuid");
1413
1642
}
1414
1643
1415
1644
#ifdef __linux__
1419
1648
bool restore_loglevel = true;
1420
1649
if(ret == -1){
1421
1650
restore_loglevel = false;
1422
perror("klogctl");
1651
perror_plus("klogctl");
1423
1652
}
1424
1653
#endif /* __linux__ */
1425
1654
1426
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
1656
if(sd < 0){
1428
perror("socket");
1657
perror_plus("socket");
1429
1658
exitcode = EX_OSERR;
1430
1659
#ifdef __linux__
1431
1660
if(restore_loglevel){
1432
1661
ret = klogctl(7, NULL, 0);
1433
1662
if(ret == -1){
1434
perror("klogctl");
1663
perror_plus("klogctl");
1435
1664
}
1436
1665
}
1437
1666
#endif /* __linux__ */
1439
1668
errno = 0;
1440
1669
ret = seteuid(uid);
1441
1670
if(ret == -1){
1442
perror("seteuid");
1671
perror_plus("seteuid");
1443
1672
}
1444
1673
goto end;
1445
1674
}
1446
1675
strcpy(network.ifr_name, interface);
1447
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
1677
if(ret == -1){
1449
perror("ioctl SIOCGIFFLAGS");
1678
perror_plus("ioctl SIOCGIFFLAGS");
1450
1679
#ifdef __linux__
1451
1680
if(restore_loglevel){
1452
1681
ret = klogctl(7, NULL, 0);
1453
1682
if(ret == -1){
1454
perror("klogctl");
1683
perror_plus("klogctl");
1455
1684
}
1456
1685
}
1457
1686
#endif /* __linux__ */
1460
1689
errno = 0;
1461
1690
ret = seteuid(uid);
1462
1691
if(ret == -1){
1463
perror("seteuid");
1692
perror_plus("seteuid");
1464
1693
}
1465
1694
goto end;
1466
1695
}
1470
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
1700
if(ret == -1){
1472
1701
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1474
1703
exitcode = EX_OSERR;
1475
1704
#ifdef __linux__
1476
1705
if(restore_loglevel){
1477
1706
ret = klogctl(7, NULL, 0);
1478
1707
if(ret == -1){
1479
perror("klogctl");
1708
perror_plus("klogctl");
1480
1709
}
1481
1710
}
1482
1711
#endif /* __linux__ */
1484
1713
errno = 0;
1485
1714
ret = seteuid(uid);
1486
1715
if(ret == -1){
1487
perror("seteuid");
1716
perror_plus("seteuid");
1488
1717
}
1489
1718
goto end;
1490
1719
}
1491
1720
}
1492
/* sleep checking until interface is running */
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1493
1723
for(int i=0; i < delay * 4; i++){
1494
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
1725
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
1726
perror_plus("ioctl SIOCGIFFLAGS");
1497
1727
} else if(network.ifr_flags & IFF_RUNNING){
1498
1728
break;
1499
1729
}
1500
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
1731
ret = nanosleep(&sleeptime, NULL);
1502
1732
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1733
perror_plus("nanosleep");
1504
1734
}
1505
1735
}
1506
1736
if(not take_down_interface){
1507
1737
/* We won't need the socket anymore */
1508
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
1739
if(ret == -1){
1510
perror("close");
1740
perror_plus("close");
1511
1741
}
1512
1742
}
1513
1743
#ifdef __linux__
1515
1745
/* Restores kernel loglevel to default */
1516
1746
ret = klogctl(7, NULL, 0);
1517
1747
if(ret == -1){
1518
perror("klogctl");
1748
perror_plus("klogctl");
1519
1749
}
1520
1750
}
1521
1751
#endif /* __linux__ */
1525
1755
/* Lower privileges */
1526
1756
ret = seteuid(uid);
1527
1757
if(ret == -1){
1528
perror("seteuid");
1758
perror_plus("seteuid");
1529
1759
}
1530
1760
} else {
1531
1761
/* Lower privileges permanently */
1532
1762
ret = setuid(uid);
1533
1763
if(ret == -1){
1534
perror("setuid");
1764
perror_plus("setuid");
1535
1765
}
1536
1766
}
1537
1767
}
1553
1783
goto end;
1554
1784
}
1555
1785
1786
if(mkdtemp(tempdir) == NULL){
1787
perror_plus("mkdtemp");
1788
goto end;
1789
}
1556
1790
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
perror("mkdtemp");
1560
goto end;
1561
}
1562
1791
1563
1792
if(quit_now){
1564
1793
goto end;
1606
1835
1607
1836
port = (uint16_t)tmpmax;
1608
1837
*address = '\0';
1609
address = connect_to;
1610
1838
/* Colon in address indicates IPv6 */
1611
1839
int af;
1612
if(strchr(address, ':') != NULL){
1840
if(strchr(connect_to, ':') != NULL){
1613
1841
af = AF_INET6;
1842
/* Accept [] around IPv6 address - see RFC 5952 */
1843
if(connect_to[0] == '[' and address[-1] == ']')
1844
{
1845
connect_to++;
1846
address[-1] = '\0';
1847
}
1614
1848
} else {
1615
1849
af = AF_INET;
1616
1850
}
1851
address = connect_to;
1617
1852
1618
1853
if(quit_now){
1619
1854
goto end;
1620
1855
}
1621
1856
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
1857
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
1859
if(quit_now or ret == 0){
1860
break;
1861
}
1862
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
1865
}
1866
sleep((int)retry_interval);
1867
}
1868
1869
if (not quit_now){
1644
1870
exitcode = EXIT_SUCCESS;
1645
1871
}
1872
1646
1873
goto end;
1647
1874
}
1648
1875
1700
1927
if(debug){
1701
1928
fprintf(stderr, "Starting Avahi loop search\n");
1702
1929
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
1933
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
1936
}
1705
1937
1706
1938
end:
1707
1939
1728
1960
if(gpgme_initialized){
1729
1961
gpgme_release(mc.ctx);
1730
1962
}
1963
1964
/* Cleans up the circular linked list of Mandos servers the client
1965
has seen */
1966
if(mc.current_server != NULL){
1967
mc.current_server->prev->next = NULL;
1968
while(mc.current_server != NULL){
1969
server *next = mc.current_server->next;
1970
free(mc.current_server);
1971
mc.current_server = next;
1972
}
1973
}
1731
1974
1732
1975
/* Take down the network interface */
1733
1976
if(take_down_interface){
1735
1978
errno = 0;
1736
1979
ret = seteuid(0);
1737
1980
if(ret == -1){
1738
perror("seteuid");
1981
perror_plus("seteuid");
1739
1982
}
1740
1983
if(geteuid() == 0){
1741
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
1985
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1986
perror_plus("ioctl SIOCGIFFLAGS");
1744
1987
} else if(network.ifr_flags & IFF_UP) {
1745
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
1990
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1749
1992
}
1750
1993
}
1751
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
1995
if(ret == -1){
1753
perror("close");
1996
perror_plus("close");
1754
1997
}
1755
1998
/* Lower privileges permanently */
1756
1999
errno = 0;
1757
2000
ret = setuid(uid);
1758
2001
if(ret == -1){
1759
perror("setuid");
2002
perror_plus("setuid");
1760
2003
}
1761
2004
}
1762
2005
}
1763
2006
1764
/* Removes the temp directory used by GPGME */
2007
/* Removes the GPGME temp directory and all files inside */
1765
2008
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
1786
2016
char *fullname = NULL;
1787
2017
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
2018
direntry->d_name);
1789
2019
if(ret < 0){
1790
perror("asprintf");
2020
perror_plus("asprintf");
1791
2021
continue;
1792
2022
}
1793
2023
ret = remove(fullname);
1797
2027
}
1798
2028
free(fullname);
1799
2029
}
1800
closedir(d);
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
1801
2036
}
1802
2037
ret = rmdir(tempdir);
1803
2038
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
2039
perror_plus("rmdir");
1805
2040
}
1806
2041
}
1807
2042
1812
2047
&old_sigterm_action,
1813
2048
NULL));
1814
2049
if(ret == -1){
1815
perror("sigaction");
2050
perror_plus("sigaction");
1816
2051
}
1817
2052
do {
1818
2053
ret = raise(signal_received);
1819
2054
} while(ret != 0 and errno == EINTR);
1820
2055
if(ret != 0){
1821
perror("raise");
2056
perror_plus("raise");
1822
2057
abort();
1823
2058
}
1824
2059
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0