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- Committer: Teddy Hogeborn
- Date: 2013-10-20 21:04:35 UTC
- Revision ID: teddy@recompile.se-20131020210435-jc94ovr5i4sve16r
* Makefile (install-client-nokey): Install "mandos-change-keytype".
(uninstall-client): Uninstall "mandos-change-keytype".
* mandos (priority): Changed back default GnuTLS priority string to
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP".
* mandos-change-keytype: New script which, assuming the Mandos server
is responding, will generate a new key with
the new mandos-keygen default parameters
(currently 4096-bit RSA), and output a
replacement section for clients.conf on the
Mandos server.
* mandos-keygen: Bug fix: output password prompt even when redirecting
stdout.
* mandos-options.xml (priority): Document new default value.
* mandos.conf (priority): - '' -
(uninstall-client): Uninstall "mandos-change-keytype".
* mandos (priority): Changed back default GnuTLS priority string to
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP".
* mandos-change-keytype: New script which, assuming the Mandos server
is responding, will generate a new key with
the new mandos-keygen default parameters
(currently 4096-bit RSA), and output a
replacement section for clients.conf on the
Mandos server.
* mandos-keygen: Bug fix: output password prompt even when redirecting
stdout.
* mandos-options.xml (priority): Document new default value.
* mandos.conf (priority): - '' -
- files added:
- mandos-change-keytype
- files removed:
- debian/upstream
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
92
91
argz_delete(), argz_append(),
93
92
argz_stringify(), argz_add(),
94
93
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
94
98
95
#ifdef __linux__
99
96
#include <sys/klog.h> /* klogctl() */
141
138
static const char sys_class_net[] = "/sys/class/net";
142
139
char *connect_to = NULL;
143
140
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
141
uid_t uid = 65534;
146
142
gid_t gid = 65534;
147
143
184
180
perror(print_text);
185
181
}
186
182
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
188
184
int fprintf_plus(FILE *stream, const char *format, ...){
189
185
va_list ap;
190
186
va_start (ap, format);
199
195
* bytes. "buffer_capacity" is how much is currently allocated,
200
196
* "buffer_length" is how much is already used.
201
197
*/
202
__attribute__((nonnull, warn_unused_result))
203
198
size_t incbuffer(char **buffer, size_t buffer_length,
204
199
size_t buffer_capacity){
205
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
212
203
return 0;
213
204
}
214
*buffer = new_buf;
215
205
buffer_capacity += BUFFER_SIZE;
216
206
}
217
207
return buffer_capacity;
218
208
}
219
209
220
210
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
212
int af, server **current_server){
224
213
int ret;
235
224
perror_plus("strdup");
236
225
return false;
237
226
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
227
/* Special case of first server */
244
228
if(*current_server == NULL){
245
229
new_server->next = new_server;
246
230
new_server->prev = new_server;
247
231
*current_server = new_server;
232
/* Place the new server last in the list */
248
233
} else {
249
/* Place the new server last in the list */
250
234
new_server->next = *current_server;
251
235
new_server->prev = (*current_server)->prev;
252
236
new_server->prev->next = new_server;
253
237
(*current_server)->prev = new_server;
254
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
255
244
return true;
256
245
}
257
246
258
247
/*
259
248
* Initialize GPGME.
260
249
*/
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
266
252
gpgme_error_t rc;
267
253
gpgme_engine_info_t engine_info;
268
254
269
255
/*
270
256
* Helper function to insert pub and seckey to the engine keyring.
271
257
*/
272
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
273
259
int ret;
274
260
int fd;
275
261
gpgme_data_t pgp_data;
356
342
* Decrypt OpenPGP data.
357
343
* Returns -1 on error
358
344
*/
359
__attribute__((nonnull, warn_unused_result))
360
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
361
346
size_t crypto_size,
362
347
char **plaintext,
482
467
return plaintext_length;
483
468
}
484
469
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
487
471
const char *ret = gnutls_strerror(value);
488
472
if(ret == NULL)
489
473
ret = "(unknown)";
491
475
}
492
476
493
477
/* GnuTLS log function callback */
494
__attribute__((nonnull))
495
478
static void debuggnutls(__attribute__((unused)) int level,
496
479
const char* string){
497
480
fprintf_plus(stderr, "GnuTLS: %s", string);
498
481
}
499
482
500
__attribute__((nonnull, warn_unused_result))
501
483
static int init_gnutls_global(const char *pubkeyfilename,
502
484
const char *seckeyfilename,
503
485
mandos_context *mc){
577
559
return -1;
578
560
}
579
561
580
__attribute__((nonnull, warn_unused_result))
581
562
static int init_gnutls_session(gnutls_session_t *session,
582
563
mandos_context *mc){
583
564
int ret;
640
621
__attribute__((unused)) const char *txt){}
641
622
642
623
/* Called when a Mandos server is found */
643
__attribute__((nonnull, warn_unused_result))
644
624
static int start_mandos_communication(const char *ip, in_port_t port,
645
625
AvahiIfIndex if_index,
646
626
int af, mandos_context *mc){
647
627
int ret, tcp_sd = -1;
648
628
ssize_t sret;
649
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
650
633
char *buffer = NULL;
651
634
char *decrypted_buffer = NULL;
652
635
size_t buffer_length = 0;
733
716
734
717
memset(&to, 0, sizeof(to));
735
718
if(af == AF_INET6){
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
738
721
} else { /* IPv4 */
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
741
724
}
742
725
if(ret < 0 ){
743
726
int e = errno;
752
735
goto mandos_end;
753
736
}
754
737
if(af == AF_INET6){
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
758
742
if(if_index == AVAHI_IF_UNSPEC){
759
743
fprintf_plus(stderr, "An IPv6 link-local address is"
760
744
" incomplete without a network interface\n");
762
746
goto mandos_end;
763
747
}
764
748
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
766
750
}
767
751
} else {
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
769
755
}
770
756
771
757
if(quit_now){
788
774
}
789
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
777
const char *pcret;
791
778
if(af == AF_INET6){
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
796
781
} else {
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
801
784
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
787
} else {
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
790
}
808
791
}
809
792
}
810
793
814
797
}
815
798
816
799
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
819
801
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
822
803
}
823
804
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
806
int e = errno;
826
807
perror_plus("connect");
827
808
errno = e;
1042
1023
return retval;
1043
1024
}
1044
1025
1045
__attribute__((nonnull))
1046
1026
static void resolve_callback(AvahiSServiceResolver *r,
1047
1027
AvahiIfIndex interface,
1048
1028
AvahiProtocol proto,
1056
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1057
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1038
flags,
1059
void *mc){
1039
void* mc){
1060
1040
if(r == NULL){
1061
1041
return;
1062
1042
}
1115
1095
const char *domain,
1116
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1117
1097
flags,
1118
void *mc){
1098
void* mc){
1119
1099
if(b == NULL){
1120
1100
return;
1121
1101
}
1181
1161
errno = old_errno;
1182
1162
}
1183
1163
1184
__attribute__((nonnull, warn_unused_result))
1185
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
1165
int ret;
1187
1166
error_t ret_errno;
1206
1185
return true;
1207
1186
}
1208
1187
1209
__attribute__((nonnull, warn_unused_result))
1210
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1189
1212
1190
/* Reject the loopback device */
1254
1232
* corresponds to an acceptable network device.
1255
1233
* (This function is passed to scandir(3) as a filter function.)
1256
1234
*/
1257
__attribute__((nonnull, warn_unused_result))
1258
1235
int good_interface(const struct dirent *if_entry){
1259
1236
if(if_entry->d_name[0] == '.'){
1260
1237
return 0;
1278
1255
/*
1279
1256
* This function determines if a network interface is up.
1280
1257
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
1258
bool interface_is_up(const char *interface){
1283
1259
struct ifreq ifr;
1284
1260
if(not get_flags(interface, &ifr)){
1295
1271
/*
1296
1272
* This function determines if a network interface is running
1297
1273
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
1274
bool interface_is_running(const char *interface){
1300
1275
struct ifreq ifr;
1301
1276
if(not get_flags(interface, &ifr)){
1309
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
1285
}
1311
1286
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
1287
int notdotentries(const struct dirent *direntry){
1314
1288
/* Skip "." and ".." */
1315
1289
if(direntry->d_name[0] == '.'
1322
1296
}
1323
1297
1324
1298
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
1299
int runnable_hook(const struct dirent *direntry){
1327
1300
int ret;
1328
1301
size_t sret;
1336
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
1310
"abcdefghijklmnopqrstuvwxyz"
1338
1311
"0123456789"
1339
"_.-");
1312
"_-");
1340
1313
if((direntry->d_name)[sret] != '\0'){
1341
1314
/* Contains non-allowed characters */
1342
1315
if(debug){
1346
1319
return 0;
1347
1320
}
1348
1321
1349
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1350
1330
if(ret == -1){
1351
1331
if(debug){
1352
1332
perror_plus("Could not stat hook");
1376
1356
return 1;
1377
1357
}
1378
1358
1379
__attribute__((nonnull, warn_unused_result))
1380
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1381
1360
mandos_context *mc){
1382
1361
int ret;
1386
1365
1387
1366
while(true){
1388
1367
if(mc->current_server == NULL){
1389
if(debug){
1368
if (debug){
1390
1369
fprintf_plus(stderr, "Wait until first server is found."
1391
1370
" No timeout!\n");
1392
1371
}
1393
1372
ret = avahi_simple_poll_iterate(s, -1);
1394
1373
} else {
1395
if(debug){
1374
if (debug){
1396
1375
fprintf_plus(stderr, "Check current_server if we should run"
1397
1376
" it, or wait\n");
1398
1377
}
1415
1394
- ((intmax_t)waited_time.tv_sec * 1000))
1416
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1417
1396
1418
if(debug){
1397
if (debug){
1419
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1420
1399
block_time);
1421
1400
}
1443
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1444
1423
}
1445
1424
if(ret != 0){
1446
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
1447
1426
return (ret != 1) ? ret : 0;
1448
1427
}
1449
1428
}
1451
1430
}
1452
1431
1453
1432
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
1433
error_t raise_privileges(void){
1456
1434
error_t old_errno = errno;
1457
1435
error_t ret_errno = 0;
1464
1442
}
1465
1443
1466
1444
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
1445
error_t raise_privileges_permanently(void){
1469
1446
error_t old_errno = errno;
1470
1447
error_t ret_errno = raise_privileges();
1481
1458
}
1482
1459
1483
1460
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
1461
error_t lower_privileges(void){
1486
1462
error_t old_errno = errno;
1487
1463
error_t ret_errno = 0;
1494
1470
}
1495
1471
1496
1472
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
1473
error_t lower_privileges_permanently(void){
1499
1474
error_t old_errno = errno;
1500
1475
error_t ret_errno = 0;
1506
1481
return ret_errno;
1507
1482
}
1508
1483
1509
#ifndef O_CLOEXEC
1510
/*
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1514
*/
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1519
if(ret < 0){
1520
return ret;
1521
}
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1524
ret | FD_CLOEXEC));
1525
}
1526
#endif /* not O_CLOEXEC */
1527
1528
__attribute__((nonnull))
1529
void run_network_hooks(const char *mode, const char *interface,
1484
bool run_network_hooks(const char *mode, const char *interface,
1530
1485
const float delay){
1531
1486
struct dirent **direntries;
1532
if(hookdir_fd == -1){
1533
hookdir_fd = open(hookdir, O_RDONLY |
1534
#ifdef O_CLOEXEC
1535
O_CLOEXEC
1536
#else /* not O_CLOEXEC */
1537
0
1538
#endif /* not O_CLOEXEC */
1539
);
1540
if(hookdir_fd == -1){
1541
if(errno == ENOENT){
1542
if(debug){
1543
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1544
" found\n", hookdir);
1545
}
1546
} else {
1547
perror_plus("open");
1548
}
1549
return;
1550
}
1551
#ifndef O_CLOEXEC
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1556
} else {
1557
hookdir_fd = -1;
1558
}
1559
return;
1560
}
1561
#endif /* not O_CLOEXEC */
1562
}
1563
#ifdef __GLIBC__
1564
#if __GLIBC_PREREQ(2, 15)
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1569
alphasort);
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1573
alphasort);
1574
#endif /* not __GLIBC__ */
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1575
1491
if(numhooks == -1){
1576
perror_plus("scandir");
1577
return;
1578
}
1579
struct dirent *direntry;
1580
int ret;
1581
int devnull = open("/dev/null", O_RDONLY);
1582
for(int i = 0; i < numhooks; i++){
1583
direntry = direntries[i];
1584
if(debug){
1585
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1586
direntry->d_name);
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");
1587
1499
}
1588
pid_t hook_pid = fork();
1589
if(hook_pid == 0){
1590
/* Child */
1591
/* Raise privileges */
1592
if(raise_privileges_permanently() != 0){
1593
perror_plus("Failed to raise privileges");
1594
_exit(EX_NOPERM);
1595
}
1596
/* Set group */
1597
errno = 0;
1598
ret = setgid(0);
1599
if(ret == -1){
1600
perror_plus("setgid");
1601
_exit(EX_NOPERM);
1602
}
1603
/* Reset supplementary groups */
1604
errno = 0;
1605
ret = setgroups(0, NULL);
1606
if(ret == -1){
1607
perror_plus("setgroups");
1608
_exit(EX_NOPERM);
1609
}
1610
ret = dup2(devnull, STDIN_FILENO);
1611
if(ret == -1){
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1613
_exit(EX_OSERR);
1614
}
1615
ret = close(devnull);
1616
if(ret == -1){
1617
perror_plus("close");
1618
_exit(EX_OSERR);
1619
}
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1621
if(ret == -1){
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1623
_exit(EX_OSERR);
1624
}
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1626
if(ret == -1){
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
ret = setenv("DEVICE", interface, 1);
1631
if(ret == -1){
1632
perror_plus("setenv");
1633
_exit(EX_OSERR);
1634
}
1635
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
_exit(EX_OSERR);
1639
}
1640
ret = setenv("MODE", mode, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
_exit(EX_OSERR);
1644
}
1645
char *delaystring;
1646
ret = asprintf(&delaystring, "%f", (double)delay);
1647
if(ret == -1){
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1648
1507
perror_plus("asprintf");
1649
_exit(EX_OSERR);
1650
}
1651
ret = setenv("DELAY", delaystring, 1);
1652
if(ret == -1){
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* 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
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
1653
1566
free(delaystring);
1654
perror_plus("setenv");
1655
_exit(EX_OSERR);
1656
}
1657
free(delaystring);
1658
if(connect_to != NULL){
1659
ret = setenv("CONNECT", connect_to, 1);
1660
if(ret == -1){
1661
perror_plus("setenv");
1662
_exit(EX_OSERR);
1663
}
1664
}
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
1667
perror_plus("fexecve");
1668
_exit(EXIT_FAILURE);
1669
}
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
continue;
1675
}
1676
if(WIFEXITED(status)){
1677
if(WEXITSTATUS(status) != 0){
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1679
" with status %d\n", direntry->d_name,
1680
WEXITSTATUS(status));
1681
continue;
1682
}
1683
} else if(WIFSIGNALED(status)){
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1685
" signal %d\n", direntry->d_name,
1686
WTERMSIG(status));
1687
continue;
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
}
1688
1578
} else {
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
1690
" crashed\n", direntry->d_name);
1691
continue;
1692
}
1693
}
1694
if(debug){
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1696
direntry->d_name);
1697
}
1698
}
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1700
perror_plus("close");
1701
} else {
1702
hookdir_fd = -1;
1703
}
1704
close(devnull);
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
1705
1615
}
1706
1616
1707
__attribute__((nonnull, warn_unused_result))
1708
1617
error_t bring_up_interface(const char *const interface,
1709
1618
const float delay){
1619
int sd = -1;
1710
1620
error_t old_errno = errno;
1711
int ret;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1712
1623
struct ifreq network;
1713
1624
unsigned int if_index = if_nametoindex(interface);
1714
1625
if(if_index == 0){
1723
1634
}
1724
1635
1725
1636
if(not interface_is_up(interface)){
1726
error_t ret_errno = 0, ioctl_errno = 0;
1727
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
1728
1638
ret_errno = errno;
1729
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1730
1640
"\"%s\"\n", interface);
1731
errno = old_errno;
1732
1641
return ret_errno;
1733
1642
}
1734
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
1735
1644
1736
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1737
if(sd == -1){
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1738
1647
ret_errno = errno;
1739
1648
perror_plus("socket");
1740
1649
errno = old_errno;
1741
1650
return ret_errno;
1742
1651
}
1743
1652
1744
1653
if(quit_now){
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1746
if(ret == -1){
1747
perror_plus("close");
1748
}
1654
close(sd);
1749
1655
errno = old_errno;
1750
1656
return EINTR;
1751
1657
}
1755
1661
interface);
1756
1662
}
1757
1663
1758
/* Raise privileges */
1759
ret_errno = raise_privileges();
1760
if(ret_errno != 0){
1761
perror_plus("Failed to raise privileges");
1762
}
1664
/* Raise priviliges */
1665
raise_privileges();
1763
1666
1764
1667
#ifdef __linux__
1765
int ret_linux;
1766
bool restore_loglevel = false;
1767
if(ret_errno == 0){
1768
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1769
messages about the network interface to mess up the prompt */
1770
ret_linux = klogctl(8, NULL, 5);
1771
if(ret_linux == -1){
1772
perror_plus("klogctl");
1773
} else {
1774
restore_loglevel = true;
1775
}
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");
1776
1675
}
1777
1676
#endif /* __linux__ */
1778
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1779
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1780
1679
#ifdef __linux__
1781
1680
if(restore_loglevel){
1782
1681
ret_linux = klogctl(7, NULL, 0);
1786
1685
}
1787
1686
#endif /* __linux__ */
1788
1687
1789
/* If raise_privileges() succeeded above */
1790
if(ret_errno == 0){
1791
/* Lower privileges */
1792
ret_errno = lower_privileges();
1793
if(ret_errno != 0){
1794
errno = ret_errno;
1795
perror_plus("Failed to lower privileges");
1796
}
1797
}
1688
/* Lower privileges */
1689
lower_privileges();
1798
1690
1799
1691
/* Close the socket */
1800
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1803
1695
}
1804
1696
1805
1697
if(ret_setflags == -1){
1806
errno = ioctl_errno;
1698
errno = ret_errno;
1807
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1808
1700
errno = old_errno;
1809
return ioctl_errno;
1701
return ret_errno;
1810
1702
}
1811
1703
} else if(debug){
1812
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1830
1722
return 0;
1831
1723
}
1832
1724
1833
__attribute__((nonnull, warn_unused_result))
1834
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1835
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1836
1730
struct ifreq network;
1837
1731
unsigned int if_index = if_nametoindex(interface);
1838
1732
if(if_index == 0){
1841
1735
return ENXIO;
1842
1736
}
1843
1737
if(interface_is_up(interface)){
1844
error_t ret_errno = 0, ioctl_errno = 0;
1845
1738
if(not get_flags(interface, &network) and debug){
1846
1739
ret_errno = errno;
1847
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1848
1741
"\"%s\"\n", interface);
1849
errno = old_errno;
1850
1742
return ret_errno;
1851
1743
}
1852
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1853
1745
1854
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1855
if(sd == -1){
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1856
1748
ret_errno = errno;
1857
1749
perror_plus("socket");
1858
1750
errno = old_errno;
1864
1756
interface);
1865
1757
}
1866
1758
1867
/* Raise privileges */
1868
ret_errno = raise_privileges();
1869
if(ret_errno != 0){
1870
perror_plus("Failed to raise privileges");
1871
}
1872
1873
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1874
ioctl_errno = errno;
1875
1876
/* If raise_privileges() succeeded above */
1877
if(ret_errno == 0){
1878
/* Lower privileges */
1879
ret_errno = lower_privileges();
1880
if(ret_errno != 0){
1881
errno = ret_errno;
1882
perror_plus("Failed to lower privileges");
1883
}
1884
}
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();
1885
1767
1886
1768
/* Close the socket */
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1888
1770
if(ret == -1){
1889
1771
perror_plus("close");
1890
1772
}
1891
1773
1892
1774
if(ret_setflags == -1){
1893
errno = ioctl_errno;
1775
errno = ret_errno;
1894
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1895
1777
errno = old_errno;
1896
return ioctl_errno;
1778
return ret_errno;
1897
1779
}
1898
1780
} else if(debug){
1899
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1907
1789
int main(int argc, char *argv[]){
1908
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
1791
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1911
1793
.interfaces = NULL, .interfaces_size = 0 };
1912
1794
AvahiSServiceBrowser *sb = NULL;
1913
1795
error_t ret_errno;
1917
1799
int exitcode = EXIT_SUCCESS;
1918
1800
char *interfaces_to_take_down = NULL;
1919
1801
size_t interfaces_to_take_down_size = 0;
1920
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1921
char old_tempdir[] = "/tmp/mandosXXXXXX";
1922
char *tempdir = NULL;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
1923
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1924
1805
const char *seckey = PATHDIR "/" SECKEY;
1925
1806
const char *pubkey = PATHDIR "/" PUBKEY;
1926
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1927
1809
1928
1810
bool gnutls_initialized = false;
1929
1811
bool gpgme_initialized = false;
2107
1989
/* Work around Debian bug #633582:
2108
1990
<http://bugs.debian.org/633582> */
2109
1991
2110
/* Re-raise privileges */
2111
ret_errno = raise_privileges();
2112
if(ret_errno != 0){
2113
errno = ret_errno;
2114
perror_plus("Failed to raise privileges");
2115
} else {
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2116
1994
struct stat st;
2117
1995
2118
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2158
2036
}
2159
2037
2160
2038
/* Lower privileges */
2161
ret_errno = lower_privileges();
2162
if(ret_errno != 0){
2163
errno = ret_errno;
2164
perror_plus("Failed to lower privileges");
2165
}
2039
lower_privileges();
2166
2040
}
2167
2041
}
2168
2042
2192
2066
goto end;
2193
2067
}
2194
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2195
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2196
}
2197
run_network_hooks("start", interfaces_hooks != NULL ?
2198
interfaces_hooks : "", delay);
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)){
2075
goto end;
2076
}
2199
2077
}
2200
2078
2201
2079
if(not debug){
2289
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2290
2168
direntries[i]->d_name);
2291
2169
if(ret_errno != 0){
2292
errno = ret_errno;
2293
2170
perror_plus("argz_add");
2294
2171
continue;
2295
2172
}
2329
2206
break;
2330
2207
}
2331
2208
bool interface_was_up = interface_is_up(interface);
2332
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2333
2210
if(not interface_was_up){
2334
if(errno != 0){
2211
if(ret != 0){
2212
errno = ret;
2335
2213
perror_plus("Failed to bring up interface");
2336
2214
} else {
2337
errno = argz_add(&interfaces_to_take_down,
2338
&interfaces_to_take_down_size,
2339
interface);
2340
if(errno != 0){
2341
perror_plus("argz_add");
2342
}
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2343
2218
}
2344
2219
}
2345
2220
}
2374
2249
goto end;
2375
2250
}
2376
2251
2377
/* Try /run/tmp before /tmp */
2378
tempdir = mkdtemp(run_tempdir);
2379
if(tempdir == NULL and errno == ENOENT){
2380
if(debug){
2381
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2382
run_tempdir, old_tempdir);
2383
}
2384
tempdir = mkdtemp(old_tempdir);
2385
}
2386
if(tempdir == NULL){
2252
if(mkdtemp(tempdir) == NULL){
2387
2253
perror_plus("mkdtemp");
2388
2254
goto end;
2389
2255
}
2256
tempdir_created = true;
2390
2257
2391
2258
if(quit_now){
2392
2259
goto end;
2467
2334
sleep((unsigned int)retry_interval);
2468
2335
}
2469
2336
2470
if(not quit_now){
2337
if (not quit_now){
2471
2338
exitcode = EXIT_SUCCESS;
2472
2339
}
2473
2340
2528
2395
if(debug){
2529
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2530
2397
}
2531
2398
2532
2399
ret = avahi_loop_with_timeout(simple_poll,
2533
2400
(int)(retry_interval * 1000), &mc);
2534
2401
if(debug){
2575
2442
}
2576
2443
}
2577
2444
2578
/* Re-raise privileges */
2445
/* Re-raise priviliges */
2579
2446
{
2580
ret_errno = raise_privileges();
2581
if(ret_errno != 0){
2582
perror_plus("Failed to raise privileges");
2583
} else {
2584
2585
/* Run network hooks */
2586
run_network_hooks("stop", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2588
2589
/* Take down the network interfaces which were brought up */
2590
{
2591
char *interface = NULL;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2594
interface))){
2595
ret_errno = take_down_interface(interface);
2596
if(ret_errno != 0){
2597
errno = ret_errno;
2598
perror_plus("Failed to take down interface");
2599
}
2600
}
2601
if(debug and (interfaces_to_take_down == NULL)){
2602
fprintf_plus(stderr, "No interfaces needed to be taken"
2603
" down\n");
2604
}
2605
}
2606
}
2607
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
2610
perror_plus("Failed to lower privileges permanently");
2611
}
2447
raise_privileges();
2448
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");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
2612
2472
}
2613
2473
2614
2474
free(interfaces_to_take_down);
2615
2475
free(interfaces_hooks);
2616
2476
2617
2477
/* Removes the GPGME temp directory and all files inside */
2618
if(tempdir != NULL){
2478
if(tempdir_created){
2619
2479
struct dirent **direntries = NULL;
2620
2480
struct dirent *direntry = NULL;
2621
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2622
2482
alphasort);
2623
if(numentries > 0){
2483
if (numentries > 0){
2624
2484
for(int i = 0; i < numentries; i++){
2625
2485
direntry = direntries[i];
2626
2486
char *fullname = NULL;
2638
2498
free(fullname);
2639
2499
}
2640
2500
}
2641
2501
2642
2502
/* need to clean even if 0 because man page doesn't specify */
2643
2503
free(direntries);
2644
if(numentries == -1){
2504
if (numentries == -1){
2645
2505
perror_plus("scandir");
2646
2506
}
2647
2507
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0