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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:58:56 UTC
- Revision ID: teddy@recompile.se-20140607215856-9q31dfsc68uuvzo4
Make mandos-client use scandirat() if it exists.
* plugins.d/mandos-client.d (hookdir_fd): File descriptor for hookdir.
(set_cloexec_flag): Define this function if O_CLOEXEC is undefined.
(run_network_hooks): Open hookdir_fd. Use scandirat() if it exists.
* plugins.d/mandos-client.d (hookdir_fd): File descriptor for hookdir.
(set_cloexec_flag): Define this function if O_CLOEXEC is undefined.
(run_network_hooks): Open hookdir_fd. Use scandirat() if it exists.
- files added:
- 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 © 2008-2013 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
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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
76
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
91
92
argz_delete(), argz_append(),
92
93
argz_stringify(), argz_add(),
93
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
94
97
95
98
#ifdef __linux__
96
99
#include <sys/klog.h> /* klogctl() */
138
141
static const char sys_class_net[] = "/sys/class/net";
139
142
char *connect_to = NULL;
140
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
141
145
uid_t uid = 65534;
142
146
gid_t gid = 65534;
143
147
180
184
perror(print_text);
181
185
}
182
186
183
__attribute__((format (gnu_printf, 2, 3)))
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
188
int fprintf_plus(FILE *stream, const char *format, ...){
185
189
va_list ap;
186
190
va_start (ap, format);
195
199
* bytes. "buffer_capacity" is how much is currently allocated,
196
200
* "buffer_length" is how much is already used.
197
201
*/
202
__attribute__((nonnull, warn_unused_result))
198
203
size_t incbuffer(char **buffer, size_t buffer_length,
199
204
size_t buffer_capacity){
200
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
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;
203
212
return 0;
204
213
}
214
*buffer = new_buf;
205
215
buffer_capacity += BUFFER_SIZE;
206
216
}
207
217
return buffer_capacity;
208
218
}
209
219
210
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
211
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
223
int af, server **current_server){
213
224
int ret;
224
235
perror_plus("strdup");
225
236
return false;
226
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
227
243
/* Special case of first server */
228
244
if(*current_server == NULL){
229
245
new_server->next = new_server;
230
246
new_server->prev = new_server;
231
247
*current_server = new_server;
232
/* Place the new server last in the list */
233
248
} else {
249
/* Place the new server last in the list */
234
250
new_server->next = *current_server;
235
251
new_server->prev = (*current_server)->prev;
236
252
new_server->prev->next = new_server;
237
253
(*current_server)->prev = new_server;
238
254
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
255
return true;
245
256
}
246
257
247
258
/*
248
259
* Initialize GPGME.
249
260
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
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){
252
266
gpgme_error_t rc;
253
267
gpgme_engine_info_t engine_info;
254
268
255
269
/*
256
270
* Helper function to insert pub and seckey to the engine keyring.
257
271
*/
258
bool import_key(const char *filename){
272
bool import_key(const char * const filename){
259
273
int ret;
260
274
int fd;
261
275
gpgme_data_t pgp_data;
342
356
* Decrypt OpenPGP data.
343
357
* Returns -1 on error
344
358
*/
359
__attribute__((nonnull, warn_unused_result))
345
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
361
size_t crypto_size,
347
362
char **plaintext,
467
482
return plaintext_length;
468
483
}
469
484
470
static const char * safer_gnutls_strerror(int value){
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
471
487
const char *ret = gnutls_strerror(value);
472
488
if(ret == NULL)
473
489
ret = "(unknown)";
475
491
}
476
492
477
493
/* GnuTLS log function callback */
494
__attribute__((nonnull))
478
495
static void debuggnutls(__attribute__((unused)) int level,
479
496
const char* string){
480
497
fprintf_plus(stderr, "GnuTLS: %s", string);
481
498
}
482
499
500
__attribute__((nonnull, warn_unused_result))
483
501
static int init_gnutls_global(const char *pubkeyfilename,
484
502
const char *seckeyfilename,
485
503
mandos_context *mc){
559
577
return -1;
560
578
}
561
579
580
__attribute__((nonnull, warn_unused_result))
562
581
static int init_gnutls_session(gnutls_session_t *session,
563
582
mandos_context *mc){
564
583
int ret;
621
640
__attribute__((unused)) const char *txt){}
622
641
623
642
/* Called when a Mandos server is found */
643
__attribute__((nonnull, warn_unused_result))
624
644
static int start_mandos_communication(const char *ip, in_port_t port,
625
645
AvahiIfIndex if_index,
626
646
int af, mandos_context *mc){
627
647
int ret, tcp_sd = -1;
628
648
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
649
struct sockaddr_storage to;
633
650
char *buffer = NULL;
634
651
char *decrypted_buffer = NULL;
635
652
size_t buffer_length = 0;
716
733
717
734
memset(&to, 0, sizeof(to));
718
735
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
721
738
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
724
741
}
725
742
if(ret < 0 ){
726
743
int e = errno;
735
752
goto mandos_end;
736
753
}
737
754
if(af == AF_INET6){
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*/
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
742
758
if(if_index == AVAHI_IF_UNSPEC){
743
759
fprintf_plus(stderr, "An IPv6 link-local address is"
744
760
" incomplete without a network interface\n");
746
762
goto mandos_end;
747
763
}
748
764
/* Set the network interface number as scope */
749
to.in6.sin6_scope_id = (uint32_t)if_index;
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
750
766
}
751
767
} else {
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
755
769
}
756
770
757
771
if(quit_now){
774
788
}
775
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
777
const char *pcret;
778
791
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
781
796
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
784
801
}
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
}
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);
791
808
}
792
809
}
793
810
797
814
}
798
815
799
816
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
801
819
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
803
822
}
804
823
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
825
int e = errno;
807
826
perror_plus("connect");
808
827
errno = e;
1023
1042
return retval;
1024
1043
}
1025
1044
1045
__attribute__((nonnull))
1026
1046
static void resolve_callback(AvahiSServiceResolver *r,
1027
1047
AvahiIfIndex interface,
1028
1048
AvahiProtocol proto,
1036
1056
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1058
flags,
1039
void* mc){
1059
void *mc){
1040
1060
if(r == NULL){
1041
1061
return;
1042
1062
}
1095
1115
const char *domain,
1096
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1117
flags,
1098
void* mc){
1118
void *mc){
1099
1119
if(b == NULL){
1100
1120
return;
1101
1121
}
1161
1181
errno = old_errno;
1162
1182
}
1163
1183
1184
__attribute__((nonnull, warn_unused_result))
1164
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1186
int ret;
1166
1187
error_t ret_errno;
1185
1206
return true;
1186
1207
}
1187
1208
1209
__attribute__((nonnull, warn_unused_result))
1188
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1189
1211
1190
1212
/* Reject the loopback device */
1232
1254
* corresponds to an acceptable network device.
1233
1255
* (This function is passed to scandir(3) as a filter function.)
1234
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1235
1258
int good_interface(const struct dirent *if_entry){
1236
1259
if(if_entry->d_name[0] == '.'){
1237
1260
return 0;
1255
1278
/*
1256
1279
* This function determines if a network interface is up.
1257
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1258
1282
bool interface_is_up(const char *interface){
1259
1283
struct ifreq ifr;
1260
1284
if(not get_flags(interface, &ifr)){
1271
1295
/*
1272
1296
* This function determines if a network interface is running
1273
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1274
1299
bool interface_is_running(const char *interface){
1275
1300
struct ifreq ifr;
1276
1301
if(not get_flags(interface, &ifr)){
1284
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1285
1310
}
1286
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1287
1313
int notdotentries(const struct dirent *direntry){
1288
1314
/* Skip "." and ".." */
1289
1315
if(direntry->d_name[0] == '.'
1296
1322
}
1297
1323
1298
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1299
1326
int runnable_hook(const struct dirent *direntry){
1300
1327
int ret;
1301
1328
size_t sret;
1309
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
1337
"abcdefghijklmnopqrstuvwxyz"
1311
1338
"0123456789"
1312
"_-");
1339
"_.-");
1313
1340
if((direntry->d_name)[sret] != '\0'){
1314
1341
/* Contains non-allowed characters */
1315
1342
if(debug){
1333
1360
}
1334
1361
return 0;
1335
1362
}
1363
free(fullname);
1336
1364
if(not (S_ISREG(st.st_mode))){
1337
1365
/* Not a regular file */
1338
1366
if(debug){
1356
1384
return 1;
1357
1385
}
1358
1386
1387
__attribute__((nonnull, warn_unused_result))
1359
1388
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
1389
mandos_context *mc){
1361
1390
int ret;
1365
1394
1366
1395
while(true){
1367
1396
if(mc->current_server == NULL){
1368
if (debug){
1397
if(debug){
1369
1398
fprintf_plus(stderr, "Wait until first server is found."
1370
1399
" No timeout!\n");
1371
1400
}
1372
1401
ret = avahi_simple_poll_iterate(s, -1);
1373
1402
} else {
1374
if (debug){
1403
if(debug){
1375
1404
fprintf_plus(stderr, "Check current_server if we should run"
1376
1405
" it, or wait\n");
1377
1406
}
1394
1423
- ((intmax_t)waited_time.tv_sec * 1000))
1395
1424
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1425
1397
if (debug){
1426
if(debug){
1398
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
1428
block_time);
1400
1429
}
1422
1451
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
1452
}
1424
1453
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1454
if(ret > 0 or errno != EINTR){
1426
1455
return (ret != 1) ? ret : 0;
1427
1456
}
1428
1457
}
1430
1459
}
1431
1460
1432
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1433
1463
error_t raise_privileges(void){
1434
1464
error_t old_errno = errno;
1435
1465
error_t ret_errno = 0;
1442
1472
}
1443
1473
1444
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1445
1476
error_t raise_privileges_permanently(void){
1446
1477
error_t old_errno = errno;
1447
1478
error_t ret_errno = raise_privileges();
1458
1489
}
1459
1490
1460
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1461
1493
error_t lower_privileges(void){
1462
1494
error_t old_errno = errno;
1463
1495
error_t ret_errno = 0;
1470
1502
}
1471
1503
1472
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1473
1506
error_t lower_privileges_permanently(void){
1474
1507
error_t old_errno = errno;
1475
1508
error_t ret_errno = 0;
1481
1514
return ret_errno;
1482
1515
}
1483
1516
1484
bool run_network_hooks(const char *mode, const char *interface,
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
1536
__attribute__((nonnull))
1537
void run_network_hooks(const char *mode, const char *interface,
1485
1538
const float delay){
1486
1539
struct dirent **direntries;
1540
if(hookdir_fd == -1){
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
1548
if(hookdir_fd == -1){
1549
if(errno == ENOENT){
1550
if(debug){
1551
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1552
" found\n", hookdir);
1553
}
1554
} else {
1555
perror_plus("open");
1556
}
1557
return;
1558
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
1583
if(numhooks == -1){
1584
perror_plus("scandir");
1585
return;
1586
}
1487
1587
struct dirent *direntry;
1488
1588
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1491
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
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){
1589
int devnull = open("/dev/null", O_RDONLY);
1590
for(int i = 0; i < numhooks; i++){
1591
direntry = direntries[i];
1592
char *fullname = NULL;
1593
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1594
if(ret < 0){
1595
perror_plus("asprintf");
1596
continue;
1597
}
1598
if(debug){
1599
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1600
direntry->d_name);
1601
}
1602
pid_t hook_pid = fork();
1603
if(hook_pid == 0){
1604
/* Child */
1605
/* Raise privileges */
1606
if(raise_privileges_permanently() != 0){
1607
perror_plus("Failed to raise privileges");
1608
_exit(EX_NOPERM);
1609
}
1610
/* Set group */
1611
errno = 0;
1612
ret = setgid(0);
1613
if(ret == -1){
1614
perror_plus("setgid");
1615
_exit(EX_NOPERM);
1616
}
1617
/* Reset supplementary groups */
1618
errno = 0;
1619
ret = setgroups(0, NULL);
1620
if(ret == -1){
1621
perror_plus("setgroups");
1622
_exit(EX_NOPERM);
1623
}
1624
ret = dup2(devnull, STDIN_FILENO);
1625
if(ret == -1){
1626
perror_plus("dup2(devnull, STDIN_FILENO)");
1627
_exit(EX_OSERR);
1628
}
1629
ret = close(devnull);
1630
if(ret == -1){
1631
perror_plus("close");
1632
_exit(EX_OSERR);
1633
}
1634
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1635
if(ret == -1){
1636
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1637
_exit(EX_OSERR);
1638
}
1639
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1640
if(ret == -1){
1641
perror_plus("setenv");
1642
_exit(EX_OSERR);
1643
}
1644
ret = setenv("DEVICE", interface, 1);
1645
if(ret == -1){
1646
perror_plus("setenv");
1647
_exit(EX_OSERR);
1648
}
1649
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1650
if(ret == -1){
1651
perror_plus("setenv");
1652
_exit(EX_OSERR);
1653
}
1654
ret = setenv("MODE", mode, 1);
1655
if(ret == -1){
1656
perror_plus("setenv");
1657
_exit(EX_OSERR);
1658
}
1659
char *delaystring;
1660
ret = asprintf(&delaystring, "%f", (double)delay);
1661
if(ret == -1){
1507
1662
perror_plus("asprintf");
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
}
1663
_exit(EX_OSERR);
1664
}
1665
ret = setenv("DELAY", delaystring, 1);
1666
if(ret == -1){
1566
1667
free(delaystring);
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
}
1668
perror_plus("setenv");
1669
_exit(EX_OSERR);
1670
}
1671
free(delaystring);
1672
if(connect_to != NULL){
1673
ret = setenv("CONNECT", connect_to, 1);
1674
if(ret == -1){
1675
perror_plus("setenv");
1676
_exit(EX_OSERR);
1677
}
1678
}
1679
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1680
perror_plus("execl");
1681
_exit(EXIT_FAILURE);
1682
}
1683
} else {
1684
int status;
1685
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1686
perror_plus("waitpid");
1687
free(fullname);
1688
continue;
1689
}
1690
if(WIFEXITED(status)){
1691
if(WEXITSTATUS(status) != 0){
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1693
" with status %d\n", direntry->d_name,
1694
WEXITSTATUS(status));
1695
free(fullname);
1696
continue;
1697
}
1698
} else if(WIFSIGNALED(status)){
1699
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1700
" signal %d\n", direntry->d_name,
1701
WTERMSIG(status));
1702
free(fullname);
1703
continue;
1578
1704
} else {
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
fprintf_plus(stderr, "Warning: network hook \"%s\""
1706
" crashed\n", direntry->d_name);
1707
free(fullname);
1708
continue;
1709
}
1710
}
1711
free(fullname);
1712
if(debug){
1713
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1714
direntry->d_name);
1715
}
1716
}
1717
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1718
perror_plus("close");
1719
} else {
1720
hookdir_fd = -1;
1721
}
1722
close(devnull);
1615
1723
}
1616
1724
1725
__attribute__((nonnull, warn_unused_result))
1617
1726
error_t bring_up_interface(const char *const interface,
1618
1727
const float delay){
1619
int sd = -1;
1620
1728
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1729
int ret;
1623
1730
struct ifreq network;
1624
1731
unsigned int if_index = if_nametoindex(interface);
1625
1732
if(if_index == 0){
1634
1741
}
1635
1742
1636
1743
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1744
error_t ret_errno = 0, ioctl_errno = 0;
1745
if(not get_flags(interface, &network)){
1638
1746
ret_errno = errno;
1639
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1640
1748
"\"%s\"\n", interface);
1749
errno = old_errno;
1641
1750
return ret_errno;
1642
1751
}
1643
network.ifr_flags |= IFF_UP;
1752
network.ifr_flags |= IFF_UP; /* set flag */
1644
1753
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1754
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1755
if(sd == -1){
1647
1756
ret_errno = errno;
1648
1757
perror_plus("socket");
1649
1758
errno = old_errno;
1650
1759
return ret_errno;
1651
1760
}
1652
1761
1653
1762
if(quit_now){
1654
close(sd);
1763
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1764
if(ret == -1){
1765
perror_plus("close");
1766
}
1655
1767
errno = old_errno;
1656
1768
return EINTR;
1657
1769
}
1661
1773
interface);
1662
1774
}
1663
1775
1664
/* Raise priviliges */
1665
raise_privileges();
1776
/* Raise privileges */
1777
ret_errno = raise_privileges();
1778
if(ret_errno != 0){
1779
perror_plus("Failed to raise privileges");
1780
}
1666
1781
1667
1782
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1783
int ret_linux;
1784
bool restore_loglevel = false;
1785
if(ret_errno == 0){
1786
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1787
messages about the network interface to mess up the prompt */
1788
ret_linux = klogctl(8, NULL, 5);
1789
if(ret_linux == -1){
1790
perror_plus("klogctl");
1791
} else {
1792
restore_loglevel = true;
1793
}
1675
1794
}
1676
1795
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1796
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1797
ioctl_errno = errno;
1679
1798
#ifdef __linux__
1680
1799
if(restore_loglevel){
1681
1800
ret_linux = klogctl(7, NULL, 0);
1685
1804
}
1686
1805
#endif /* __linux__ */
1687
1806
1688
/* Lower privileges */
1689
lower_privileges();
1807
/* If raise_privileges() succeeded above */
1808
if(ret_errno == 0){
1809
/* Lower privileges */
1810
ret_errno = lower_privileges();
1811
if(ret_errno != 0){
1812
errno = ret_errno;
1813
perror_plus("Failed to lower privileges");
1814
}
1815
}
1690
1816
1691
1817
/* Close the socket */
1692
1818
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1695
1821
}
1696
1822
1697
1823
if(ret_setflags == -1){
1698
errno = ret_errno;
1824
errno = ioctl_errno;
1699
1825
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
1826
errno = old_errno;
1701
return ret_errno;
1827
return ioctl_errno;
1702
1828
}
1703
1829
} else if(debug){
1704
1830
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1722
1848
return 0;
1723
1849
}
1724
1850
1851
__attribute__((nonnull, warn_unused_result))
1725
1852
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
1853
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
1854
struct ifreq network;
1731
1855
unsigned int if_index = if_nametoindex(interface);
1732
1856
if(if_index == 0){
1735
1859
return ENXIO;
1736
1860
}
1737
1861
if(interface_is_up(interface)){
1862
error_t ret_errno = 0, ioctl_errno = 0;
1738
1863
if(not get_flags(interface, &network) and debug){
1739
1864
ret_errno = errno;
1740
1865
fprintf_plus(stderr, "Failed to get flags for interface "
1741
1866
"\"%s\"\n", interface);
1867
errno = old_errno;
1742
1868
return ret_errno;
1743
1869
}
1744
1870
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1871
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1872
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1873
if(sd == -1){
1748
1874
ret_errno = errno;
1749
1875
perror_plus("socket");
1750
1876
errno = old_errno;
1756
1882
interface);
1757
1883
}
1758
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
/* Raise privileges */
1886
ret_errno = raise_privileges();
1887
if(ret_errno != 0){
1888
perror_plus("Failed to raise privileges");
1889
}
1890
1891
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1892
ioctl_errno = errno;
1893
1894
/* If raise_privileges() succeeded above */
1895
if(ret_errno == 0){
1896
/* Lower privileges */
1897
ret_errno = lower_privileges();
1898
if(ret_errno != 0){
1899
errno = ret_errno;
1900
perror_plus("Failed to lower privileges");
1901
}
1902
}
1767
1903
1768
1904
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1905
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
1906
if(ret == -1){
1771
1907
perror_plus("close");
1772
1908
}
1773
1909
1774
1910
if(ret_setflags == -1){
1775
errno = ret_errno;
1911
errno = ioctl_errno;
1776
1912
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
1913
errno = old_errno;
1778
return ret_errno;
1914
return ioctl_errno;
1779
1915
}
1780
1916
} else if(debug){
1781
1917
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1789
1925
int main(int argc, char *argv[]){
1790
1926
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
1927
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1928
"+CTYPE-OPENPGP", .current_server = NULL,
1793
1929
.interfaces = NULL, .interfaces_size = 0 };
1794
1930
AvahiSServiceBrowser *sb = NULL;
1795
1931
error_t ret_errno;
1799
1935
int exitcode = EXIT_SUCCESS;
1800
1936
char *interfaces_to_take_down = NULL;
1801
1937
size_t interfaces_to_take_down_size = 0;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
1938
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1939
char old_tempdir[] = "/tmp/mandosXXXXXX";
1940
char *tempdir = NULL;
1804
1941
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
1942
const char *seckey = PATHDIR "/" SECKEY;
1806
1943
const char *pubkey = PATHDIR "/" PUBKEY;
1807
1944
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1945
1810
1946
bool gnutls_initialized = false;
1811
1947
bool gpgme_initialized = false;
1989
2125
/* Work around Debian bug #633582:
1990
2126
<http://bugs.debian.org/633582> */
1991
2127
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2128
/* Re-raise privileges */
2129
ret_errno = raise_privileges();
2130
if(ret_errno != 0){
2131
errno = ret_errno;
2132
perror_plus("Failed to raise privileges");
2133
} else {
1994
2134
struct stat st;
1995
2135
1996
2136
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2036
2176
}
2037
2177
2038
2178
/* Lower privileges */
2039
lower_privileges();
2179
ret_errno = lower_privileges();
2180
if(ret_errno != 0){
2181
errno = ret_errno;
2182
perror_plus("Failed to lower privileges");
2183
}
2040
2184
}
2041
2185
}
2042
2186
2066
2210
goto end;
2067
2211
}
2068
2212
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2213
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2214
}
2215
run_network_hooks("start", interfaces_hooks != NULL ?
2216
interfaces_hooks : "", delay);
2077
2217
}
2078
2218
2079
2219
if(not debug){
2167
2307
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
2308
direntries[i]->d_name);
2169
2309
if(ret_errno != 0){
2310
errno = ret_errno;
2170
2311
perror_plus("argz_add");
2171
2312
continue;
2172
2313
}
2206
2347
break;
2207
2348
}
2208
2349
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2350
errno = bring_up_interface(interface, delay);
2210
2351
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2352
if(errno != 0){
2213
2353
perror_plus("Failed to bring up interface");
2214
2354
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2355
errno = argz_add(&interfaces_to_take_down,
2356
&interfaces_to_take_down_size,
2357
interface);
2358
if(errno != 0){
2359
perror_plus("argz_add");
2360
}
2218
2361
}
2219
2362
}
2220
2363
}
2249
2392
goto end;
2250
2393
}
2251
2394
2252
if(mkdtemp(tempdir) == NULL){
2395
/* Try /run/tmp before /tmp */
2396
tempdir = mkdtemp(run_tempdir);
2397
if(tempdir == NULL and errno == ENOENT){
2398
if(debug){
2399
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2400
run_tempdir, old_tempdir);
2401
}
2402
tempdir = mkdtemp(old_tempdir);
2403
}
2404
if(tempdir == NULL){
2253
2405
perror_plus("mkdtemp");
2254
2406
goto end;
2255
2407
}
2256
tempdir_created = true;
2257
2408
2258
2409
if(quit_now){
2259
2410
goto end;
2334
2485
sleep((unsigned int)retry_interval);
2335
2486
}
2336
2487
2337
if (not quit_now){
2488
if(not quit_now){
2338
2489
exitcode = EXIT_SUCCESS;
2339
2490
}
2340
2491
2395
2546
if(debug){
2396
2547
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
2548
}
2398
2549
2399
2550
ret = avahi_loop_with_timeout(simple_poll,
2400
2551
(int)(retry_interval * 1000), &mc);
2401
2552
if(debug){
2442
2593
}
2443
2594
}
2444
2595
2445
/* Re-raise priviliges */
2596
/* Re-raise privileges */
2446
2597
{
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();
2598
ret_errno = raise_privileges();
2599
if(ret_errno != 0){
2600
perror_plus("Failed to raise privileges");
2601
} else {
2602
2603
/* Run network hooks */
2604
run_network_hooks("stop", interfaces_hooks != NULL ?
2605
interfaces_hooks : "", delay);
2606
2607
/* Take down the network interfaces which were brought up */
2608
{
2609
char *interface = NULL;
2610
while((interface=argz_next(interfaces_to_take_down,
2611
interfaces_to_take_down_size,
2612
interface))){
2613
ret_errno = take_down_interface(interface);
2614
if(ret_errno != 0){
2615
errno = ret_errno;
2616
perror_plus("Failed to take down interface");
2617
}
2618
}
2619
if(debug and (interfaces_to_take_down == NULL)){
2620
fprintf_plus(stderr, "No interfaces needed to be taken"
2621
" down\n");
2622
}
2623
}
2624
}
2625
2626
ret_errno = lower_privileges_permanently();
2627
if(ret_errno != 0){
2628
perror_plus("Failed to lower privileges permanently");
2629
}
2472
2630
}
2473
2631
2474
2632
free(interfaces_to_take_down);
2475
2633
free(interfaces_hooks);
2476
2634
2477
2635
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
2636
if(tempdir != NULL){
2479
2637
struct dirent **direntries = NULL;
2480
2638
struct dirent *direntry = NULL;
2481
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
2640
alphasort);
2483
if (numentries > 0){
2641
if(numentries > 0){
2484
2642
for(int i = 0; i < numentries; i++){
2485
2643
direntry = direntries[i];
2486
2644
char *fullname = NULL;
2498
2656
free(fullname);
2499
2657
}
2500
2658
}
2501
2659
2502
2660
/* need to clean even if 0 because man page doesn't specify */
2503
2661
free(direntries);
2504
if (numentries == -1){
2662
if(numentries == -1){
2505
2663
perror_plus("scandir");
2506
2664
}
2507
2665
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0