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- Committer: Teddy Hogeborn
- Date: 2013-10-28 20:08:32 UTC
- Revision ID: teddy@recompile.se-20131028200832-80d1k8c5e8mugpkx
Syntax fix; use "raise" better in Mandos server.
* mandos: Syntax fix; use "raise" better in Mandos server; Always
raise instances, not classes, skip argument when re-raising,
etc.
* mandos: Syntax fix; use "raise" better in Mandos server; Always
raise instances, not classes, skip argument when re-raising,
etc.
- 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
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
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
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
93
91
argz_delete(), argz_append(),
94
92
argz_stringify(), argz_add(),
95
93
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
94
99
95
#ifdef __linux__
100
96
#include <sys/klog.h> /* klogctl() */
142
138
static const char sys_class_net[] = "/sys/class/net";
143
139
char *connect_to = NULL;
144
140
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
141
uid_t uid = 65534;
147
142
gid_t gid = 65534;
148
143
185
180
perror(print_text);
186
181
}
187
182
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
189
184
int fprintf_plus(FILE *stream, const char *format, ...){
190
185
va_list ap;
191
186
va_start (ap, format);
200
195
* bytes. "buffer_capacity" is how much is currently allocated,
201
196
* "buffer_length" is how much is already used.
202
197
*/
203
__attribute__((nonnull, warn_unused_result))
204
198
size_t incbuffer(char **buffer, size_t buffer_length,
205
199
size_t buffer_capacity){
206
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
213
203
return 0;
214
204
}
215
*buffer = new_buf;
216
205
buffer_capacity += BUFFER_SIZE;
217
206
}
218
207
return buffer_capacity;
219
208
}
220
209
221
210
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
212
int af, server **current_server){
225
213
int ret;
236
224
perror_plus("strdup");
237
225
return false;
238
226
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
227
/* Special case of first server */
245
228
if(*current_server == NULL){
246
229
new_server->next = new_server;
247
230
new_server->prev = new_server;
248
231
*current_server = new_server;
232
/* Place the new server last in the list */
249
233
} else {
250
/* Place the new server last in the list */
251
234
new_server->next = *current_server;
252
235
new_server->prev = (*current_server)->prev;
253
236
new_server->prev->next = new_server;
254
237
(*current_server)->prev = new_server;
255
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
256
244
return true;
257
245
}
258
246
259
247
/*
260
248
* Initialize GPGME.
261
249
*/
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){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
267
252
gpgme_error_t rc;
268
253
gpgme_engine_info_t engine_info;
269
254
270
255
/*
271
256
* Helper function to insert pub and seckey to the engine keyring.
272
257
*/
273
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
274
259
int ret;
275
260
int fd;
276
261
gpgme_data_t pgp_data;
357
342
* Decrypt OpenPGP data.
358
343
* Returns -1 on error
359
344
*/
360
__attribute__((nonnull, warn_unused_result))
361
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
346
size_t crypto_size,
363
347
char **plaintext,
483
467
return plaintext_length;
484
468
}
485
469
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
488
471
const char *ret = gnutls_strerror(value);
489
472
if(ret == NULL)
490
473
ret = "(unknown)";
492
475
}
493
476
494
477
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
478
static void debuggnutls(__attribute__((unused)) int level,
497
479
const char* string){
498
480
fprintf_plus(stderr, "GnuTLS: %s", string);
499
481
}
500
482
501
__attribute__((nonnull, warn_unused_result))
502
483
static int init_gnutls_global(const char *pubkeyfilename,
503
484
const char *seckeyfilename,
504
485
mandos_context *mc){
578
559
return -1;
579
560
}
580
561
581
__attribute__((nonnull, warn_unused_result))
582
562
static int init_gnutls_session(gnutls_session_t *session,
583
563
mandos_context *mc){
584
564
int ret;
641
621
__attribute__((unused)) const char *txt){}
642
622
643
623
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
624
static int start_mandos_communication(const char *ip, in_port_t port,
646
625
AvahiIfIndex if_index,
647
626
int af, mandos_context *mc){
648
627
int ret, tcp_sd = -1;
649
628
ssize_t sret;
650
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
651
633
char *buffer = NULL;
652
634
char *decrypted_buffer = NULL;
653
635
size_t buffer_length = 0;
734
716
735
717
memset(&to, 0, sizeof(to));
736
718
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
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);
739
721
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
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);
742
724
}
743
725
if(ret < 0 ){
744
726
int e = errno;
753
735
goto mandos_end;
754
736
}
755
737
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((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*/
759
742
if(if_index == AVAHI_IF_UNSPEC){
760
743
fprintf_plus(stderr, "An IPv6 link-local address is"
761
744
" incomplete without a network interface\n");
763
746
goto mandos_end;
764
747
}
765
748
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
767
750
}
768
751
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
770
755
}
771
756
772
757
if(quit_now){
789
774
}
790
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
777
const char *pcret;
792
778
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
797
781
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
802
784
}
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);
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
}
809
791
}
810
792
}
811
793
815
797
}
816
798
817
799
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
801
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
803
}
824
804
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
806
int e = errno;
827
807
perror_plus("connect");
828
808
errno = e;
1043
1023
return retval;
1044
1024
}
1045
1025
1046
__attribute__((nonnull))
1047
1026
static void resolve_callback(AvahiSServiceResolver *r,
1048
1027
AvahiIfIndex interface,
1049
1028
AvahiProtocol proto,
1057
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
1038
flags,
1060
void *mc){
1039
void* mc){
1061
1040
if(r == NULL){
1062
1041
return;
1063
1042
}
1116
1095
const char *domain,
1117
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
1097
flags,
1119
void *mc){
1098
void* mc){
1120
1099
if(b == NULL){
1121
1100
return;
1122
1101
}
1182
1161
errno = old_errno;
1183
1162
}
1184
1163
1185
__attribute__((nonnull, warn_unused_result))
1186
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1165
int ret;
1188
1166
error_t ret_errno;
1207
1185
return true;
1208
1186
}
1209
1187
1210
__attribute__((nonnull, warn_unused_result))
1211
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1189
1213
1190
/* Reject the loopback device */
1255
1232
* corresponds to an acceptable network device.
1256
1233
* (This function is passed to scandir(3) as a filter function.)
1257
1234
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
1235
int good_interface(const struct dirent *if_entry){
1260
1236
if(if_entry->d_name[0] == '.'){
1261
1237
return 0;
1279
1255
/*
1280
1256
* This function determines if a network interface is up.
1281
1257
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
1258
bool interface_is_up(const char *interface){
1284
1259
struct ifreq ifr;
1285
1260
if(not get_flags(interface, &ifr)){
1296
1271
/*
1297
1272
* This function determines if a network interface is running
1298
1273
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
1274
bool interface_is_running(const char *interface){
1301
1275
struct ifreq ifr;
1302
1276
if(not get_flags(interface, &ifr)){
1310
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
1285
}
1312
1286
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
1287
int notdotentries(const struct dirent *direntry){
1315
1288
/* Skip "." and ".." */
1316
1289
if(direntry->d_name[0] == '.'
1323
1296
}
1324
1297
1325
1298
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
1299
int runnable_hook(const struct dirent *direntry){
1328
1300
int ret;
1329
1301
size_t sret;
1337
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
1310
"abcdefghijklmnopqrstuvwxyz"
1339
1311
"0123456789"
1340
"_.-");
1312
"_-");
1341
1313
if((direntry->d_name)[sret] != '\0'){
1342
1314
/* Contains non-allowed characters */
1343
1315
if(debug){
1347
1319
return 0;
1348
1320
}
1349
1321
1350
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);
1351
1330
if(ret == -1){
1352
1331
if(debug){
1353
1332
perror_plus("Could not stat hook");
1377
1356
return 1;
1378
1357
}
1379
1358
1380
__attribute__((nonnull, warn_unused_result))
1381
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
1360
mandos_context *mc){
1383
1361
int ret;
1387
1365
1388
1366
while(true){
1389
1367
if(mc->current_server == NULL){
1390
if(debug){
1368
if (debug){
1391
1369
fprintf_plus(stderr, "Wait until first server is found."
1392
1370
" No timeout!\n");
1393
1371
}
1394
1372
ret = avahi_simple_poll_iterate(s, -1);
1395
1373
} else {
1396
if(debug){
1374
if (debug){
1397
1375
fprintf_plus(stderr, "Check current_server if we should run"
1398
1376
" it, or wait\n");
1399
1377
}
1416
1394
- ((intmax_t)waited_time.tv_sec * 1000))
1417
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1396
1419
if(debug){
1397
if (debug){
1420
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
1399
block_time);
1422
1400
}
1444
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
1423
}
1446
1424
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
1448
1426
return (ret != 1) ? ret : 0;
1449
1427
}
1450
1428
}
1452
1430
}
1453
1431
1454
1432
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
1433
error_t raise_privileges(void){
1457
1434
error_t old_errno = errno;
1458
1435
error_t ret_errno = 0;
1465
1442
}
1466
1443
1467
1444
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
1445
error_t raise_privileges_permanently(void){
1470
1446
error_t old_errno = errno;
1471
1447
error_t ret_errno = raise_privileges();
1482
1458
}
1483
1459
1484
1460
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
1461
error_t lower_privileges(void){
1487
1462
error_t old_errno = errno;
1488
1463
error_t ret_errno = 0;
1495
1470
}
1496
1471
1497
1472
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
1473
error_t lower_privileges_permanently(void){
1500
1474
error_t old_errno = errno;
1501
1475
error_t ret_errno = 0;
1507
1481
return ret_errno;
1508
1482
}
1509
1483
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1484
bool run_network_hooks(const char *mode, const char *interface,
1512
1485
const float delay){
1513
1486
struct dirent **direntries;
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__ */
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1540
1491
if(numhooks == -1){
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);
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");
1552
1499
}
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){
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){
1613
1507
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
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
}
1618
1566
free(delaystring);
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;
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
}
1662
1578
} else {
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);
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;
1679
1615
}
1680
1616
1681
__attribute__((nonnull, warn_unused_result))
1682
1617
error_t bring_up_interface(const char *const interface,
1683
1618
const float delay){
1619
int sd = -1;
1684
1620
error_t old_errno = errno;
1685
int ret;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1686
1623
struct ifreq network;
1687
1624
unsigned int if_index = if_nametoindex(interface);
1688
1625
if(if_index == 0){
1697
1634
}
1698
1635
1699
1636
if(not interface_is_up(interface)){
1700
error_t ret_errno = 0, ioctl_errno = 0;
1701
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
1702
1638
ret_errno = errno;
1703
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1704
1640
"\"%s\"\n", interface);
1705
errno = old_errno;
1706
1641
return ret_errno;
1707
1642
}
1708
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
1709
1644
1710
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1711
if(sd == -1){
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1712
1647
ret_errno = errno;
1713
1648
perror_plus("socket");
1714
1649
errno = old_errno;
1715
1650
return ret_errno;
1716
1651
}
1717
1652
1718
1653
if(quit_now){
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1720
if(ret == -1){
1721
perror_plus("close");
1722
}
1654
close(sd);
1723
1655
errno = old_errno;
1724
1656
return EINTR;
1725
1657
}
1729
1661
interface);
1730
1662
}
1731
1663
1732
/* Raise privileges */
1733
ret_errno = raise_privileges();
1734
if(ret_errno != 0){
1735
perror_plus("Failed to raise privileges");
1736
}
1664
/* Raise priviliges */
1665
raise_privileges();
1737
1666
1738
1667
#ifdef __linux__
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
}
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");
1750
1675
}
1751
1676
#endif /* __linux__ */
1752
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1753
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1754
1679
#ifdef __linux__
1755
1680
if(restore_loglevel){
1756
1681
ret_linux = klogctl(7, NULL, 0);
1760
1685
}
1761
1686
#endif /* __linux__ */
1762
1687
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
}
1688
/* Lower privileges */
1689
lower_privileges();
1772
1690
1773
1691
/* Close the socket */
1774
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
1695
}
1778
1696
1779
1697
if(ret_setflags == -1){
1780
errno = ioctl_errno;
1698
errno = ret_errno;
1781
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1782
1700
errno = old_errno;
1783
return ioctl_errno;
1701
return ret_errno;
1784
1702
}
1785
1703
} else if(debug){
1786
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1804
1722
return 0;
1805
1723
}
1806
1724
1807
__attribute__((nonnull, warn_unused_result))
1808
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1809
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1810
1730
struct ifreq network;
1811
1731
unsigned int if_index = if_nametoindex(interface);
1812
1732
if(if_index == 0){
1815
1735
return ENXIO;
1816
1736
}
1817
1737
if(interface_is_up(interface)){
1818
error_t ret_errno = 0, ioctl_errno = 0;
1819
1738
if(not get_flags(interface, &network) and debug){
1820
1739
ret_errno = errno;
1821
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1822
1741
"\"%s\"\n", interface);
1823
errno = old_errno;
1824
1742
return ret_errno;
1825
1743
}
1826
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1827
1745
1828
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1829
if(sd == -1){
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1830
1748
ret_errno = errno;
1831
1749
perror_plus("socket");
1832
1750
errno = old_errno;
1838
1756
interface);
1839
1757
}
1840
1758
1841
/* Raise privileges */
1842
ret_errno = raise_privileges();
1843
if(ret_errno != 0){
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
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
}
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();
1859
1767
1860
1768
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
1770
if(ret == -1){
1863
1771
perror_plus("close");
1864
1772
}
1865
1773
1866
1774
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1775
errno = ret_errno;
1868
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
1777
errno = old_errno;
1870
return ioctl_errno;
1778
return ret_errno;
1871
1779
}
1872
1780
} else if(debug){
1873
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1881
1789
int main(int argc, char *argv[]){
1882
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
1791
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1885
1793
.interfaces = NULL, .interfaces_size = 0 };
1886
1794
AvahiSServiceBrowser *sb = NULL;
1887
1795
error_t ret_errno;
1891
1799
int exitcode = EXIT_SUCCESS;
1892
1800
char *interfaces_to_take_down = NULL;
1893
1801
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
1897
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
1805
const char *seckey = PATHDIR "/" SECKEY;
1899
1806
const char *pubkey = PATHDIR "/" PUBKEY;
1900
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1901
1809
1902
1810
bool gnutls_initialized = false;
1903
1811
bool gpgme_initialized = false;
2081
1989
/* Work around Debian bug #633582:
2082
1990
<http://bugs.debian.org/633582> */
2083
1991
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 {
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2090
1994
struct stat st;
2091
1995
2092
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2132
2036
}
2133
2037
2134
2038
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2039
lower_privileges();
2140
2040
}
2141
2041
}
2142
2042
2166
2066
goto end;
2167
2067
}
2168
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
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
}
2173
2077
}
2174
2078
2175
2079
if(not debug){
2263
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
2168
direntries[i]->d_name);
2265
2169
if(ret_errno != 0){
2266
errno = ret_errno;
2267
2170
perror_plus("argz_add");
2268
2171
continue;
2269
2172
}
2303
2206
break;
2304
2207
}
2305
2208
bool interface_was_up = interface_is_up(interface);
2306
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2307
2210
if(not interface_was_up){
2308
if(errno != 0){
2211
if(ret != 0){
2212
errno = ret;
2309
2213
perror_plus("Failed to bring up interface");
2310
2214
} else {
2311
errno = argz_add(&interfaces_to_take_down,
2312
&interfaces_to_take_down_size,
2313
interface);
2314
if(errno != 0){
2315
perror_plus("argz_add");
2316
}
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2317
2218
}
2318
2219
}
2319
2220
}
2348
2249
goto end;
2349
2250
}
2350
2251
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){
2252
if(mkdtemp(tempdir) == NULL){
2361
2253
perror_plus("mkdtemp");
2362
2254
goto end;
2363
2255
}
2256
tempdir_created = true;
2364
2257
2365
2258
if(quit_now){
2366
2259
goto end;
2441
2334
sleep((unsigned int)retry_interval);
2442
2335
}
2443
2336
2444
if(not quit_now){
2337
if (not quit_now){
2445
2338
exitcode = EXIT_SUCCESS;
2446
2339
}
2447
2340
2502
2395
if(debug){
2503
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2504
2397
}
2505
2398
2506
2399
ret = avahi_loop_with_timeout(simple_poll,
2507
2400
(int)(retry_interval * 1000), &mc);
2508
2401
if(debug){
2549
2442
}
2550
2443
}
2551
2444
2552
/* Re-raise privileges */
2445
/* Re-raise priviliges */
2553
2446
{
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
}
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();
2586
2472
}
2587
2473
2588
2474
free(interfaces_to_take_down);
2589
2475
free(interfaces_hooks);
2590
2476
2591
2477
/* Removes the GPGME temp directory and all files inside */
2592
if(tempdir != NULL){
2478
if(tempdir_created){
2593
2479
struct dirent **direntries = NULL;
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
}
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
2484
for(int i = 0; i < numentries; i++){
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2630
2499
}
2631
TEMP_FAILURE_RETRY(close(tempdir_fd));
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2632
2510
}
2633
2511
}
2634
2512
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0