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» Revision
237.7.249
(compared to revision 237.7.214)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-06-14 02:55:24 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140614025524-k03150tjp4t89w1d
plugin-runner: Restore resources correctly if fork() fails.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
- files added:
- debian/upstream
- files removed:
- debian/upstream-signing-key.pgp
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
91
93
argz_delete(), argz_append(),
92
94
argz_stringify(), argz_add(),
93
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
94
98
95
99
#ifdef __linux__
96
100
#include <sys/klog.h> /* klogctl() */
138
142
static const char sys_class_net[] = "/sys/class/net";
139
143
char *connect_to = NULL;
140
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
141
146
uid_t uid = 65534;
142
147
gid_t gid = 65534;
143
148
180
185
perror(print_text);
181
186
}
182
187
183
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
189
int fprintf_plus(FILE *stream, const char *format, ...){
185
190
va_list ap;
186
191
va_start (ap, format);
195
200
* bytes. "buffer_capacity" is how much is currently allocated,
196
201
* "buffer_length" is how much is already used.
197
202
*/
203
__attribute__((nonnull, warn_unused_result))
198
204
size_t incbuffer(char **buffer, size_t buffer_length,
199
205
size_t buffer_capacity){
200
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
219
}
214
220
215
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
216
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
224
int af, server **current_server){
218
225
int ret;
229
236
perror_plus("strdup");
230
237
return false;
231
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
232
244
/* Special case of first server */
233
245
if(*current_server == NULL){
234
246
new_server->next = new_server;
235
247
new_server->prev = new_server;
236
248
*current_server = new_server;
237
/* Place the new server last in the list */
238
249
} else {
250
/* Place the new server last in the list */
239
251
new_server->next = *current_server;
240
252
new_server->prev = (*current_server)->prev;
241
253
new_server->prev->next = new_server;
242
254
(*current_server)->prev = new_server;
243
255
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
return false;
248
}
249
256
return true;
250
257
}
251
258
252
259
/*
253
260
* Initialize GPGME.
254
261
*/
255
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
257
267
gpgme_error_t rc;
258
268
gpgme_engine_info_t engine_info;
259
269
260
270
/*
261
271
* Helper function to insert pub and seckey to the engine keyring.
262
272
*/
263
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
264
274
int ret;
265
275
int fd;
266
276
gpgme_data_t pgp_data;
347
357
* Decrypt OpenPGP data.
348
358
* Returns -1 on error
349
359
*/
360
__attribute__((nonnull, warn_unused_result))
350
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
351
362
size_t crypto_size,
352
363
char **plaintext,
472
483
return plaintext_length;
473
484
}
474
485
475
static const char * safer_gnutls_strerror(int value){
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
476
488
const char *ret = gnutls_strerror(value);
477
489
if(ret == NULL)
478
490
ret = "(unknown)";
480
492
}
481
493
482
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
483
496
static void debuggnutls(__attribute__((unused)) int level,
484
497
const char* string){
485
498
fprintf_plus(stderr, "GnuTLS: %s", string);
486
499
}
487
500
501
__attribute__((nonnull, warn_unused_result))
488
502
static int init_gnutls_global(const char *pubkeyfilename,
489
503
const char *seckeyfilename,
490
504
mandos_context *mc){
564
578
return -1;
565
579
}
566
580
581
__attribute__((nonnull, warn_unused_result))
567
582
static int init_gnutls_session(gnutls_session_t *session,
568
583
mandos_context *mc){
569
584
int ret;
626
641
__attribute__((unused)) const char *txt){}
627
642
628
643
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
629
645
static int start_mandos_communication(const char *ip, in_port_t port,
630
646
AvahiIfIndex if_index,
631
647
int af, mandos_context *mc){
632
648
int ret, tcp_sd = -1;
633
649
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
650
struct sockaddr_storage to;
638
651
char *buffer = NULL;
639
652
char *decrypted_buffer = NULL;
640
653
size_t buffer_length = 0;
721
734
722
735
memset(&to, 0, sizeof(to));
723
736
if(af == AF_INET6){
724
to.in6.sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
726
739
} else { /* IPv4 */
727
to.in.sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in.sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
729
742
}
730
743
if(ret < 0 ){
731
744
int e = errno;
740
753
goto mandos_end;
741
754
}
742
755
if(af == AF_INET6){
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
748
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
753
759
if(if_index == AVAHI_IF_UNSPEC){
754
760
fprintf_plus(stderr, "An IPv6 link-local address is"
755
761
" incomplete without a network interface\n");
757
763
goto mandos_end;
758
764
}
759
765
/* Set the network interface number as scope */
760
to.in6.sin6_scope_id = (uint32_t)if_index;
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
761
767
}
762
768
} else {
763
to.in.sin_port = htons(port);
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
764
770
}
765
771
766
772
if(quit_now){
783
789
}
784
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
785
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
786
const char *pcret;
787
792
if(af == AF_INET6){
788
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
789
sizeof(addrstr));
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
790
797
} else {
791
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
792
sizeof(addrstr));
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
793
802
}
794
if(pcret == NULL){
795
perror_plus("inet_ntop");
796
} else {
797
if(strcmp(addrstr, ip) != 0){
798
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
799
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
800
809
}
801
810
}
802
811
806
815
}
807
816
808
817
if(af == AF_INET6){
809
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
810
820
} else {
811
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
812
823
}
813
824
if(ret < 0){
814
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
815
826
int e = errno;
816
827
perror_plus("connect");
817
828
errno = e;
1032
1043
return retval;
1033
1044
}
1034
1045
1046
__attribute__((nonnull))
1035
1047
static void resolve_callback(AvahiSServiceResolver *r,
1036
1048
AvahiIfIndex interface,
1037
1049
AvahiProtocol proto,
1045
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
1046
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1047
1059
flags,
1048
void* mc){
1060
void *mc){
1049
1061
if(r == NULL){
1050
1062
return;
1051
1063
}
1104
1116
const char *domain,
1105
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1106
1118
flags,
1107
void* mc){
1119
void *mc){
1108
1120
if(b == NULL){
1109
1121
return;
1110
1122
}
1170
1182
errno = old_errno;
1171
1183
}
1172
1184
1185
__attribute__((nonnull, warn_unused_result))
1173
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1174
1187
int ret;
1175
1188
error_t ret_errno;
1194
1207
return true;
1195
1208
}
1196
1209
1210
__attribute__((nonnull, warn_unused_result))
1197
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1198
1212
1199
1213
/* Reject the loopback device */
1241
1255
* corresponds to an acceptable network device.
1242
1256
* (This function is passed to scandir(3) as a filter function.)
1243
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1244
1259
int good_interface(const struct dirent *if_entry){
1245
1260
if(if_entry->d_name[0] == '.'){
1246
1261
return 0;
1264
1279
/*
1265
1280
* This function determines if a network interface is up.
1266
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1267
1283
bool interface_is_up(const char *interface){
1268
1284
struct ifreq ifr;
1269
1285
if(not get_flags(interface, &ifr)){
1280
1296
/*
1281
1297
* This function determines if a network interface is running
1282
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1283
1300
bool interface_is_running(const char *interface){
1284
1301
struct ifreq ifr;
1285
1302
if(not get_flags(interface, &ifr)){
1293
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1294
1311
}
1295
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1296
1314
int notdotentries(const struct dirent *direntry){
1297
1315
/* Skip "." and ".." */
1298
1316
if(direntry->d_name[0] == '.'
1305
1323
}
1306
1324
1307
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1308
1327
int runnable_hook(const struct dirent *direntry){
1309
1328
int ret;
1310
1329
size_t sret;
1318
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1319
1338
"abcdefghijklmnopqrstuvwxyz"
1320
1339
"0123456789"
1321
"_-");
1340
"_.-");
1322
1341
if((direntry->d_name)[sret] != '\0'){
1323
1342
/* Contains non-allowed characters */
1324
1343
if(debug){
1328
1347
return 0;
1329
1348
}
1330
1349
1331
char *fullname = NULL;
1332
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1333
if(ret < 0){
1334
perror_plus("asprintf");
1335
return 0;
1336
}
1337
1338
ret = stat(fullname, &st);
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1339
1351
if(ret == -1){
1340
1352
if(debug){
1341
1353
perror_plus("Could not stat hook");
1365
1377
return 1;
1366
1378
}
1367
1379
1380
__attribute__((nonnull, warn_unused_result))
1368
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
1382
mandos_context *mc){
1370
1383
int ret;
1374
1387
1375
1388
while(true){
1376
1389
if(mc->current_server == NULL){
1377
if (debug){
1390
if(debug){
1378
1391
fprintf_plus(stderr, "Wait until first server is found."
1379
1392
" No timeout!\n");
1380
1393
}
1381
1394
ret = avahi_simple_poll_iterate(s, -1);
1382
1395
} else {
1383
if (debug){
1396
if(debug){
1384
1397
fprintf_plus(stderr, "Check current_server if we should run"
1385
1398
" it, or wait\n");
1386
1399
}
1403
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1404
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1405
1418
1406
if (debug){
1419
if(debug){
1407
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1408
1421
block_time);
1409
1422
}
1431
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1432
1445
}
1433
1446
if(ret != 0){
1434
if (ret > 0 or errno != EINTR){
1447
if(ret > 0 or errno != EINTR){
1435
1448
return (ret != 1) ? ret : 0;
1436
1449
}
1437
1450
}
1439
1452
}
1440
1453
1441
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1442
1456
error_t raise_privileges(void){
1443
1457
error_t old_errno = errno;
1444
1458
error_t ret_errno = 0;
1451
1465
}
1452
1466
1453
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1454
1469
error_t raise_privileges_permanently(void){
1455
1470
error_t old_errno = errno;
1456
1471
error_t ret_errno = raise_privileges();
1467
1482
}
1468
1483
1469
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1470
1486
error_t lower_privileges(void){
1471
1487
error_t old_errno = errno;
1472
1488
error_t ret_errno = 0;
1479
1495
}
1480
1496
1481
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1482
1499
error_t lower_privileges_permanently(void){
1483
1500
error_t old_errno = errno;
1484
1501
error_t ret_errno = 0;
1490
1507
return ret_errno;
1491
1508
}
1492
1509
1493
bool run_network_hooks(const char *mode, const char *interface,
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1494
1512
const float delay){
1495
1513
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
alphasort);
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1518
if(debug){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1521
}
1522
} else {
1523
perror_plus("open");
1524
}
1525
return;
1526
}
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1498
1540
if(numhooks == -1){
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
1541
perror_plus("scandir");
1542
return;
1543
}
1544
struct dirent *direntry;
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1549
if(debug){
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1551
direntry->d_name);
1506
1552
}
1507
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
int devnull = open("/dev/null", O_RDONLY);
1511
for(int i = 0; i < numhooks; i++){
1512
direntry = direntries[i];
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1515
if(ret < 0){
1553
pid_t hook_pid = fork();
1554
if(hook_pid == 0){
1555
/* Child */
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1516
1613
perror_plus("asprintf");
1517
continue;
1518
}
1519
if(debug){
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1521
direntry->d_name);
1522
}
1523
pid_t hook_pid = fork();
1524
if(hook_pid == 0){
1525
/* Child */
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1528
/* Set group */
1529
errno = 0;
1530
ret = setgid(0);
1531
if(ret == -1){
1532
perror_plus("setgid");
1533
}
1534
/* Reset supplementary groups */
1535
errno = 0;
1536
ret = setgroups(0, NULL);
1537
if(ret == -1){
1538
perror_plus("setgroups");
1539
}
1540
dup2(devnull, STDIN_FILENO);
1541
close(devnull);
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("DEVICE", interface, 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
ret = setenv("MODE", mode, 1);
1559
if(ret == -1){
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
char *delaystring;
1564
ret = asprintf(&delaystring, "%f", delay);
1565
if(ret == -1){
1566
perror_plus("asprintf");
1567
_exit(EX_OSERR);
1568
}
1569
ret = setenv("DELAY", delaystring, 1);
1570
if(ret == -1){
1571
free(delaystring);
1572
perror_plus("setenv");
1573
_exit(EX_OSERR);
1574
}
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1575
1618
free(delaystring);
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1578
if(ret == -1){
1579
perror_plus("setenv");
1580
_exit(EX_OSERR);
1581
}
1582
}
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1586
}
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1587
1662
} else {
1588
int status;
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1590
perror_plus("waitpid");
1591
free(fullname);
1592
continue;
1593
}
1594
if(WIFEXITED(status)){
1595
if(WEXITSTATUS(status) != 0){
1596
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1597
" with status %d\n", direntry->d_name,
1598
WEXITSTATUS(status));
1599
free(fullname);
1600
continue;
1601
}
1602
} else if(WIFSIGNALED(status)){
1603
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1604
" signal %d\n", direntry->d_name,
1605
WTERMSIG(status));
1606
free(fullname);
1607
continue;
1608
} else {
1609
fprintf_plus(stderr, "Warning: network hook \"%s\""
1610
" crashed\n", direntry->d_name);
1611
free(fullname);
1612
continue;
1613
}
1614
}
1615
free(fullname);
1616
if(debug){
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1618
direntry->d_name);
1619
}
1620
}
1621
close(devnull);
1622
}
1623
return true;
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1674
perror_plus("close");
1675
} else {
1676
hookdir_fd = -1;
1677
}
1678
close(devnull);
1624
1679
}
1625
1680
1681
__attribute__((nonnull, warn_unused_result))
1626
1682
error_t bring_up_interface(const char *const interface,
1627
1683
const float delay){
1628
int sd = -1;
1629
1684
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1685
int ret;
1632
1686
struct ifreq network;
1633
1687
unsigned int if_index = if_nametoindex(interface);
1634
1688
if(if_index == 0){
1643
1697
}
1644
1698
1645
1699
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1700
error_t ret_errno = 0, ioctl_errno = 0;
1701
if(not get_flags(interface, &network)){
1647
1702
ret_errno = errno;
1648
1703
fprintf_plus(stderr, "Failed to get flags for interface "
1649
1704
"\"%s\"\n", interface);
1705
errno = old_errno;
1650
1706
return ret_errno;
1651
1707
}
1652
network.ifr_flags |= IFF_UP;
1708
network.ifr_flags |= IFF_UP; /* set flag */
1653
1709
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
1710
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1711
if(sd == -1){
1656
1712
ret_errno = errno;
1657
1713
perror_plus("socket");
1658
1714
errno = old_errno;
1659
1715
return ret_errno;
1660
1716
}
1661
1717
1662
1718
if(quit_now){
1663
close(sd);
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1720
if(ret == -1){
1721
perror_plus("close");
1722
}
1664
1723
errno = old_errno;
1665
1724
return EINTR;
1666
1725
}
1670
1729
interface);
1671
1730
}
1672
1731
1673
/* Raise priviliges */
1674
raise_privileges();
1732
/* Raise privileges */
1733
ret_errno = raise_privileges();
1734
if(ret_errno != 0){
1735
perror_plus("Failed to raise privileges");
1736
}
1675
1737
1676
1738
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1739
int ret_linux;
1740
bool restore_loglevel = false;
1741
if(ret_errno == 0){
1742
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1743
messages about the network interface to mess up the prompt */
1744
ret_linux = klogctl(8, NULL, 5);
1745
if(ret_linux == -1){
1746
perror_plus("klogctl");
1747
} else {
1748
restore_loglevel = true;
1749
}
1684
1750
}
1685
1751
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
1752
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1753
ioctl_errno = errno;
1688
1754
#ifdef __linux__
1689
1755
if(restore_loglevel){
1690
1756
ret_linux = klogctl(7, NULL, 0);
1694
1760
}
1695
1761
#endif /* __linux__ */
1696
1762
1697
/* Lower privileges */
1698
lower_privileges();
1763
/* If raise_privileges() succeeded above */
1764
if(ret_errno == 0){
1765
/* Lower privileges */
1766
ret_errno = lower_privileges();
1767
if(ret_errno != 0){
1768
errno = ret_errno;
1769
perror_plus("Failed to lower privileges");
1770
}
1771
}
1699
1772
1700
1773
/* Close the socket */
1701
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
1777
}
1705
1778
1706
1779
if(ret_setflags == -1){
1707
errno = ret_errno;
1780
errno = ioctl_errno;
1708
1781
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
1782
errno = old_errno;
1710
return ret_errno;
1783
return ioctl_errno;
1711
1784
}
1712
1785
} else if(debug){
1713
1786
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1731
1804
return 0;
1732
1805
}
1733
1806
1807
__attribute__((nonnull, warn_unused_result))
1734
1808
error_t take_down_interface(const char *const interface){
1735
1809
error_t old_errno = errno;
1736
1810
struct ifreq network;
1741
1815
return ENXIO;
1742
1816
}
1743
1817
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1818
error_t ret_errno = 0, ioctl_errno = 0;
1745
1819
if(not get_flags(interface, &network) and debug){
1746
1820
ret_errno = errno;
1747
1821
fprintf_plus(stderr, "Failed to get flags for interface "
1748
1822
"\"%s\"\n", interface);
1823
errno = old_errno;
1749
1824
return ret_errno;
1750
1825
}
1751
1826
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
1827
1753
1828
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
1829
if(sd == -1){
1755
1830
ret_errno = errno;
1756
1831
perror_plus("socket");
1757
1832
errno = old_errno;
1763
1838
interface);
1764
1839
}
1765
1840
1766
/* Raise priviliges */
1767
raise_privileges();
1841
/* Raise privileges */
1842
ret_errno = raise_privileges();
1843
if(ret_errno != 0){
1844
perror_plus("Failed to raise privileges");
1845
}
1768
1846
1769
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
1848
ioctl_errno = errno;
1771
1849
1772
/* Lower privileges */
1773
lower_privileges();
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1774
1859
1775
1860
/* Close the socket */
1776
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1779
1864
}
1780
1865
1781
1866
if(ret_setflags == -1){
1782
errno = ret_errno;
1867
errno = ioctl_errno;
1783
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
1869
errno = old_errno;
1785
return ret_errno;
1870
return ioctl_errno;
1786
1871
}
1787
1872
} else if(debug){
1788
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1796
1881
int main(int argc, char *argv[]){
1797
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
1883
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1800
1885
.interfaces = NULL, .interfaces_size = 0 };
1801
1886
AvahiSServiceBrowser *sb = NULL;
1802
1887
error_t ret_errno;
1806
1891
int exitcode = EXIT_SUCCESS;
1807
1892
char *interfaces_to_take_down = NULL;
1808
1893
size_t interfaces_to_take_down_size = 0;
1809
char tempdir[] = "/tmp/mandosXXXXXX";
1810
bool tempdir_created = false;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1811
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1812
1898
const char *seckey = PATHDIR "/" SECKEY;
1813
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1995
2081
/* Work around Debian bug #633582:
1996
2082
<http://bugs.debian.org/633582> */
1997
2083
1998
/* Re-raise priviliges */
1999
if(raise_privileges() == 0){
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
2089
} else {
2000
2090
struct stat st;
2001
2091
2002
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2042
2132
}
2043
2133
2044
2134
/* Lower privileges */
2045
lower_privileges();
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2046
2140
}
2047
2141
}
2048
2142
2074
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
2170
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
2081
2173
}
2082
2174
2083
2175
if(not debug){
2161
2253
2162
2254
/* If no interfaces were specified, make a list */
2163
2255
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2256
struct dirent **direntries = NULL;
2165
2257
/* Look for any good interfaces */
2166
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2167
2259
alphasort);
2211
2303
break;
2212
2304
}
2213
2305
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2306
errno = bring_up_interface(interface, delay);
2215
2307
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2308
if(errno != 0){
2218
2309
perror_plus("Failed to bring up interface");
2219
2310
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2311
errno = argz_add(&interfaces_to_take_down,
2312
&interfaces_to_take_down_size,
2313
interface);
2314
if(errno != 0){
2225
2315
perror_plus("argz_add");
2226
2316
}
2227
2317
}
2258
2348
goto end;
2259
2349
}
2260
2350
2261
if(mkdtemp(tempdir) == NULL){
2351
/* Try /run/tmp before /tmp */
2352
tempdir = mkdtemp(run_tempdir);
2353
if(tempdir == NULL and errno == ENOENT){
2354
if(debug){
2355
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2356
run_tempdir, old_tempdir);
2357
}
2358
tempdir = mkdtemp(old_tempdir);
2359
}
2360
if(tempdir == NULL){
2262
2361
perror_plus("mkdtemp");
2263
2362
goto end;
2264
2363
}
2265
tempdir_created = true;
2266
2364
2267
2365
if(quit_now){
2268
2366
goto end;
2343
2441
sleep((unsigned int)retry_interval);
2344
2442
}
2345
2443
2346
if (not quit_now){
2444
if(not quit_now){
2347
2445
exitcode = EXIT_SUCCESS;
2348
2446
}
2349
2447
2404
2502
if(debug){
2405
2503
fprintf_plus(stderr, "Starting Avahi loop search\n");
2406
2504
}
2407
2505
2408
2506
ret = avahi_loop_with_timeout(simple_poll,
2409
2507
(int)(retry_interval * 1000), &mc);
2410
2508
if(debug){
2451
2549
}
2452
2550
}
2453
2551
2454
/* Re-raise priviliges */
2552
/* Re-raise privileges */
2455
2553
{
2456
raise_privileges();
2457
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2461
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
2472
}
2473
}
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2477
}
2478
}
2479
2480
lower_privileges_permanently();
2554
ret_errno = raise_privileges();
2555
if(ret_errno != 0){
2556
perror_plus("Failed to raise privileges");
2557
} else {
2558
2559
/* Run network hooks */
2560
run_network_hooks("stop", interfaces_hooks != NULL ?
2561
interfaces_hooks : "", delay);
2562
2563
/* Take down the network interfaces which were brought up */
2564
{
2565
char *interface = NULL;
2566
while((interface=argz_next(interfaces_to_take_down,
2567
interfaces_to_take_down_size,
2568
interface))){
2569
ret_errno = take_down_interface(interface);
2570
if(ret_errno != 0){
2571
errno = ret_errno;
2572
perror_plus("Failed to take down interface");
2573
}
2574
}
2575
if(debug and (interfaces_to_take_down == NULL)){
2576
fprintf_plus(stderr, "No interfaces needed to be taken"
2577
" down\n");
2578
}
2579
}
2580
}
2581
2582
ret_errno = lower_privileges_permanently();
2583
if(ret_errno != 0){
2584
perror_plus("Failed to lower privileges permanently");
2585
}
2481
2586
}
2482
2587
2483
2588
free(interfaces_to_take_down);
2484
2589
free(interfaces_hooks);
2485
2590
2486
2591
/* Removes the GPGME temp directory and all files inside */
2487
if(tempdir_created){
2592
if(tempdir != NULL){
2488
2593
struct dirent **direntries = NULL;
2489
struct dirent *direntry = NULL;
2490
int numentries = scandir(tempdir, &direntries, notdotentries,
2491
alphasort);
2492
if (numentries > 0){
2493
for(int i = 0; i < numentries; i++){
2494
direntry = direntries[i];
2495
char *fullname = NULL;
2496
ret = asprintf(&fullname, "%s/%s", tempdir,
2497
direntry->d_name);
2498
if(ret < 0){
2499
perror_plus("asprintf");
2500
continue;
2501
}
2502
ret = remove(fullname);
2503
if(ret == -1){
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2505
strerror(errno));
2506
}
2507
free(fullname);
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2595
O_NOFOLLOW));
2596
if(tempdir_fd == -1){
2597
perror_plus("open");
2598
} else {
2599
#ifdef __GLIBC__
2600
#if __GLIBC_PREREQ(2, 15)
2601
int numentries = scandirat(tempdir_fd, ".", &direntries,
2602
notdotentries, alphasort);
2603
#else /* not __GLIBC_PREREQ(2, 15) */
2604
int numentries = scandir(tempdir, &direntries, notdotentries,
2605
alphasort);
2606
#endif /* not __GLIBC_PREREQ(2, 15) */
2607
#else /* not __GLIBC__ */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC__ */
2611
if(numentries > 0){
2612
for(int i = 0; i < numentries; i++){
2613
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2614
if(ret == -1){
2615
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2616
" \"%s\", 0): %s\n", tempdir,
2617
direntries[i]->d_name, strerror(errno));
2618
}
2619
}
2620
2621
/* need to clean even if 0 because man page doesn't specify */
2622
free(direntries);
2623
if(numentries == -1){
2624
perror_plus("scandir");
2625
}
2626
ret = rmdir(tempdir);
2627
if(ret == -1 and errno != ENOENT){
2628
perror_plus("rmdir");
2629
}
2508
2630
}
2509
}
2510
2511
/* need to clean even if 0 because man page doesn't specify */
2512
free(direntries);
2513
if (numentries == -1){
2514
perror_plus("scandir");
2515
}
2516
ret = rmdir(tempdir);
2517
if(ret == -1 and errno != ENOENT){
2518
perror_plus("rmdir");
2631
TEMP_FAILURE_RETRY(close(tempdir_fd));
2519
2632
}
2520
2633
}
2521
2634
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0