To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 672
- compare with another revision
- download diff
- download tarball
- view history from revision 672
- Committer: Teddy Hogeborn
- Date: 2014-03-23 19:24:40 UTC
- Revision ID: teddy@recompile.se-20140323192440-d71iiqxebsxf9u2v
Update GCC warning flags and function attributes to GCC 4.7.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
- files added:
- debian/upstream-signing-key.pgp
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
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() */
180
183
perror(print_text);
181
184
}
182
185
183
__attribute__((format (gnu_printf, 2, 3)))
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
187
int fprintf_plus(FILE *stream, const char *format, ...){
185
188
va_list ap;
186
189
va_start (ap, format);
187
190
188
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
192
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
194
}
192
195
193
196
/*
195
198
* bytes. "buffer_capacity" is how much is currently allocated,
196
199
* "buffer_length" is how much is already used.
197
200
*/
201
__attribute__((nonnull, warn_unused_result))
198
202
size_t incbuffer(char **buffer, size_t buffer_length,
199
203
size_t buffer_capacity){
200
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
203
211
return 0;
204
212
}
213
*buffer = new_buf;
205
214
buffer_capacity += BUFFER_SIZE;
206
215
}
207
216
return buffer_capacity;
208
217
}
209
218
210
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
211
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
222
int af, server **current_server){
213
223
int ret;
224
234
perror_plus("strdup");
225
235
return false;
226
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
227
242
/* Special case of first server */
228
243
if(*current_server == NULL){
229
244
new_server->next = new_server;
230
245
new_server->prev = new_server;
231
246
*current_server = new_server;
232
/* Place the new server last in the list */
233
247
} else {
248
/* Place the new server last in the list */
234
249
new_server->next = *current_server;
235
250
new_server->prev = (*current_server)->prev;
236
251
new_server->prev->next = new_server;
237
252
(*current_server)->prev = new_server;
238
253
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
254
return true;
245
255
}
246
256
247
257
/*
248
258
* Initialize GPGME.
249
259
*/
260
__attribute__((nonnull, warn_unused_result))
250
261
static bool init_gpgme(const char *seckey, const char *pubkey,
251
262
const char *tempdir, mandos_context *mc){
252
263
gpgme_error_t rc;
342
353
* Decrypt OpenPGP data.
343
354
* Returns -1 on error
344
355
*/
356
__attribute__((nonnull, warn_unused_result))
345
357
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
358
size_t crypto_size,
347
359
char **plaintext,
467
479
return plaintext_length;
468
480
}
469
481
470
static const char * safer_gnutls_strerror(int value){
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
471
484
const char *ret = gnutls_strerror(value);
472
485
if(ret == NULL)
473
486
ret = "(unknown)";
475
488
}
476
489
477
490
/* GnuTLS log function callback */
491
__attribute__((nonnull))
478
492
static void debuggnutls(__attribute__((unused)) int level,
479
493
const char* string){
480
494
fprintf_plus(stderr, "GnuTLS: %s", string);
481
495
}
482
496
497
__attribute__((nonnull, warn_unused_result))
483
498
static int init_gnutls_global(const char *pubkeyfilename,
484
499
const char *seckeyfilename,
485
500
mandos_context *mc){
559
574
return -1;
560
575
}
561
576
577
__attribute__((nonnull, warn_unused_result))
562
578
static int init_gnutls_session(gnutls_session_t *session,
563
579
mandos_context *mc){
564
580
int ret;
621
637
__attribute__((unused)) const char *txt){}
622
638
623
639
/* Called when a Mandos server is found */
640
__attribute__((nonnull, warn_unused_result))
624
641
static int start_mandos_communication(const char *ip, in_port_t port,
625
642
AvahiIfIndex if_index,
626
643
int af, mandos_context *mc){
627
644
int ret, tcp_sd = -1;
628
645
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
646
struct sockaddr_storage to;
633
647
char *buffer = NULL;
634
648
char *decrypted_buffer = NULL;
635
649
size_t buffer_length = 0;
659
673
return -1;
660
674
}
661
675
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
662
708
ret = init_gnutls_session(&session, mc);
663
709
if(ret != 0){
664
710
return -1;
684
730
685
731
memset(&to, 0, sizeof(to));
686
732
if(af == AF_INET6){
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
689
735
} else { /* IPv4 */
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
692
738
}
693
739
if(ret < 0 ){
694
740
int e = errno;
703
749
goto mandos_end;
704
750
}
705
751
if(af == AF_INET6){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
710
755
if(if_index == AVAHI_IF_UNSPEC){
711
756
fprintf_plus(stderr, "An IPv6 link-local address is"
712
757
" incomplete without a network interface\n");
714
759
goto mandos_end;
715
760
}
716
761
/* Set the network interface number as scope */
717
to.in6.sin6_scope_id = (uint32_t)if_index;
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
718
763
}
719
764
} else {
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
723
766
}
724
767
725
768
if(quit_now){
742
785
}
743
786
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
787
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
745
const char *pcret;
746
788
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
749
793
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
752
798
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
759
805
}
760
806
}
761
807
765
811
}
766
812
767
813
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
769
816
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
771
819
}
772
820
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
822
int e = errno;
775
823
perror_plus("connect");
776
824
errno = e;
991
1039
return retval;
992
1040
}
993
1041
1042
__attribute__((nonnull))
994
1043
static void resolve_callback(AvahiSServiceResolver *r,
995
1044
AvahiIfIndex interface,
996
1045
AvahiProtocol proto,
1004
1053
AVAHI_GCC_UNUSED AvahiStringList *txt,
1005
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1006
1055
flags,
1007
void* mc){
1056
void *mc){
1008
1057
if(r == NULL){
1009
1058
return;
1010
1059
}
1063
1112
const char *domain,
1064
1113
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1065
1114
flags,
1066
void* mc){
1115
void *mc){
1067
1116
if(b == NULL){
1068
1117
return;
1069
1118
}
1129
1178
errno = old_errno;
1130
1179
}
1131
1180
1181
__attribute__((nonnull, warn_unused_result))
1132
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1133
1183
int ret;
1134
1184
error_t ret_errno;
1153
1203
return true;
1154
1204
}
1155
1205
1206
__attribute__((nonnull, warn_unused_result))
1156
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1208
1158
1209
/* Reject the loopback device */
1200
1251
* corresponds to an acceptable network device.
1201
1252
* (This function is passed to scandir(3) as a filter function.)
1202
1253
*/
1254
__attribute__((nonnull, warn_unused_result))
1203
1255
int good_interface(const struct dirent *if_entry){
1204
1256
if(if_entry->d_name[0] == '.'){
1205
1257
return 0;
1223
1275
/*
1224
1276
* This function determines if a network interface is up.
1225
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1226
1279
bool interface_is_up(const char *interface){
1227
1280
struct ifreq ifr;
1228
1281
if(not get_flags(interface, &ifr)){
1239
1292
/*
1240
1293
* This function determines if a network interface is running
1241
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1242
1296
bool interface_is_running(const char *interface){
1243
1297
struct ifreq ifr;
1244
1298
if(not get_flags(interface, &ifr)){
1252
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1253
1307
}
1254
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1255
1310
int notdotentries(const struct dirent *direntry){
1256
1311
/* Skip "." and ".." */
1257
1312
if(direntry->d_name[0] == '.'
1264
1319
}
1265
1320
1266
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1267
1323
int runnable_hook(const struct dirent *direntry){
1268
1324
int ret;
1269
1325
size_t sret;
1324
1380
return 1;
1325
1381
}
1326
1382
1383
__attribute__((nonnull, warn_unused_result))
1327
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1328
1385
mandos_context *mc){
1329
1386
int ret;
1333
1390
1334
1391
while(true){
1335
1392
if(mc->current_server == NULL){
1336
if (debug){
1393
if(debug){
1337
1394
fprintf_plus(stderr, "Wait until first server is found."
1338
1395
" No timeout!\n");
1339
1396
}
1340
1397
ret = avahi_simple_poll_iterate(s, -1);
1341
1398
} else {
1342
if (debug){
1399
if(debug){
1343
1400
fprintf_plus(stderr, "Check current_server if we should run"
1344
1401
" it, or wait\n");
1345
1402
}
1362
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1363
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1364
1421
1365
if (debug){
1422
if(debug){
1366
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1367
1424
block_time);
1368
1425
}
1390
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
1448
}
1392
1449
if(ret != 0){
1393
if (ret > 0 or errno != EINTR){
1450
if(ret > 0 or errno != EINTR){
1394
1451
return (ret != 1) ? ret : 0;
1395
1452
}
1396
1453
}
1398
1455
}
1399
1456
1400
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1401
1459
error_t raise_privileges(void){
1402
1460
error_t old_errno = errno;
1403
1461
error_t ret_errno = 0;
1410
1468
}
1411
1469
1412
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1413
1472
error_t raise_privileges_permanently(void){
1414
1473
error_t old_errno = errno;
1415
1474
error_t ret_errno = raise_privileges();
1426
1485
}
1427
1486
1428
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1429
1489
error_t lower_privileges(void){
1430
1490
error_t old_errno = errno;
1431
1491
error_t ret_errno = 0;
1438
1498
}
1439
1499
1440
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1441
1502
error_t lower_privileges_permanently(void){
1442
1503
error_t old_errno = errno;
1443
1504
error_t ret_errno = 0;
1449
1510
return ret_errno;
1450
1511
}
1451
1512
1452
bool run_network_hooks(const char *mode, const char *interface,
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1453
1515
const float delay){
1454
1516
struct dirent **direntries;
1455
struct dirent *direntry;
1456
int ret;
1457
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1458
1518
alphasort);
1459
1519
if(numhooks == -1){
1466
1526
perror_plus("scandir");
1467
1527
}
1468
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1469
1531
int devnull = open("/dev/null", O_RDONLY);
1470
1532
for(int i = 0; i < numhooks; i++){
1471
1533
direntry = direntries[i];
1483
1545
if(hook_pid == 0){
1484
1546
/* Child */
1485
1547
/* Raise privileges */
1486
raise_privileges_permanently();
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1487
1552
/* Set group */
1488
1553
errno = 0;
1489
1554
ret = setgid(0);
1490
1555
if(ret == -1){
1491
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1492
1558
}
1493
1559
/* Reset supplementary groups */
1494
1560
errno = 0;
1495
1561
ret = setgroups(0, NULL);
1496
1562
if(ret == -1){
1497
1563
perror_plus("setgroups");
1498
}
1499
dup2(devnull, STDIN_FILENO);
1500
close(devnull);
1501
dup2(STDERR_FILENO, STDOUT_FILENO);
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1502
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1503
1582
if(ret == -1){
1504
1583
perror_plus("setenv");
1520
1599
_exit(EX_OSERR);
1521
1600
}
1522
1601
char *delaystring;
1523
ret = asprintf(&delaystring, "%f", delay);
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1524
1603
if(ret == -1){
1525
1604
perror_plus("asprintf");
1526
1605
_exit(EX_OSERR);
1579
1658
}
1580
1659
close(devnull);
1581
1660
}
1582
return true;
1583
1661
}
1584
1662
1663
__attribute__((nonnull, warn_unused_result))
1585
1664
error_t bring_up_interface(const char *const interface,
1586
1665
const float delay){
1587
int sd = -1;
1588
1666
error_t old_errno = errno;
1589
error_t ret_errno = 0;
1590
int ret, ret_setflags;
1667
int ret;
1591
1668
struct ifreq network;
1592
1669
unsigned int if_index = if_nametoindex(interface);
1593
1670
if(if_index == 0){
1602
1679
}
1603
1680
1604
1681
if(not interface_is_up(interface)){
1605
if(not get_flags(interface, &network) and debug){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1606
1684
ret_errno = errno;
1607
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1608
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1609
1688
return ret_errno;
1610
1689
}
1611
network.ifr_flags |= IFF_UP;
1690
network.ifr_flags |= IFF_UP; /* set flag */
1612
1691
1613
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1614
if(sd < 0){
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1615
1694
ret_errno = errno;
1616
1695
perror_plus("socket");
1617
1696
errno = old_errno;
1618
1697
return ret_errno;
1619
1698
}
1620
1699
1621
1700
if(quit_now){
1622
close(sd);
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1623
1705
errno = old_errno;
1624
1706
return EINTR;
1625
1707
}
1629
1711
interface);
1630
1712
}
1631
1713
1632
/* Raise priviliges */
1633
raise_privileges();
1634
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1635
1720
#ifdef __linux__
1636
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1637
messages about the network interface to mess up the prompt */
1638
int ret_linux = klogctl(8, NULL, 5);
1639
bool restore_loglevel = true;
1640
if(ret_linux == -1){
1641
restore_loglevel = false;
1642
perror_plus("klogctl");
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1643
1731
}
1644
1732
#endif /* __linux__ */
1645
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1646
ret_errno = errno;
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1647
1735
#ifdef __linux__
1648
1736
if(restore_loglevel){
1649
1737
ret_linux = klogctl(7, NULL, 0);
1653
1741
}
1654
1742
#endif /* __linux__ */
1655
1743
1656
/* Lower privileges */
1657
lower_privileges();
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1658
1753
1659
1754
/* Close the socket */
1660
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1663
1758
}
1664
1759
1665
1760
if(ret_setflags == -1){
1666
errno = ret_errno;
1761
errno = ioctl_errno;
1667
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1668
1763
errno = old_errno;
1669
return ret_errno;
1764
return ioctl_errno;
1670
1765
}
1671
1766
} else if(debug){
1672
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1690
1785
return 0;
1691
1786
}
1692
1787
1788
__attribute__((nonnull, warn_unused_result))
1693
1789
error_t take_down_interface(const char *const interface){
1694
int sd = -1;
1695
1790
error_t old_errno = errno;
1696
error_t ret_errno = 0;
1697
int ret, ret_setflags;
1698
1791
struct ifreq network;
1699
1792
unsigned int if_index = if_nametoindex(interface);
1700
1793
if(if_index == 0){
1703
1796
return ENXIO;
1704
1797
}
1705
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1706
1800
if(not get_flags(interface, &network) and debug){
1707
1801
ret_errno = errno;
1708
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1709
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1710
1805
return ret_errno;
1711
1806
}
1712
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1713
1808
1714
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1715
if(sd < 0){
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1716
1811
ret_errno = errno;
1717
1812
perror_plus("socket");
1718
1813
errno = old_errno;
1724
1819
interface);
1725
1820
}
1726
1821
1727
/* Raise priviliges */
1728
raise_privileges();
1729
1730
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1731
ret_errno = errno;
1732
1733
/* Lower privileges */
1734
lower_privileges();
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1735
1839
1736
1840
/* Close the socket */
1737
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1738
1842
if(ret == -1){
1739
1843
perror_plus("close");
1740
1844
}
1741
1845
1742
1846
if(ret_setflags == -1){
1743
errno = ret_errno;
1847
errno = ioctl_errno;
1744
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1745
1849
errno = old_errno;
1746
return ret_errno;
1850
return ioctl_errno;
1747
1851
}
1748
1852
} else if(debug){
1749
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1757
1861
int main(int argc, char *argv[]){
1758
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1759
1863
.priority = "SECURE256:!CTYPE-X.509:"
1760
"+CTYPE-OPENPGP", .current_server = NULL,
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1761
1865
.interfaces = NULL, .interfaces_size = 0 };
1762
1866
AvahiSServiceBrowser *sb = NULL;
1763
1867
error_t ret_errno;
1773
1877
const char *seckey = PATHDIR "/" SECKEY;
1774
1878
const char *pubkey = PATHDIR "/" PUBKEY;
1775
1879
char *interfaces_hooks = NULL;
1776
size_t interfaces_hooks_size = 0;
1777
1880
1778
1881
bool gnutls_initialized = false;
1779
1882
bool gpgme_initialized = false;
1957
2060
/* Work around Debian bug #633582:
1958
2061
<http://bugs.debian.org/633582> */
1959
2062
1960
/* Re-raise priviliges */
1961
if(raise_privileges() == 0){
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
2068
} else {
1962
2069
struct stat st;
1963
2070
1964
2071
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2004
2111
}
2005
2112
2006
2113
/* Lower privileges */
2007
errno = 0;
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2011
2118
}
2012
2119
}
2013
2120
}
2014
2121
2015
/* Remove empty interface names */
2122
/* Remove invalid interface names (except "none") */
2016
2123
{
2017
2124
char *interface = NULL;
2018
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2019
2126
interface))){
2020
if(if_nametoindex(interface) == 0){
2021
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2022
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2023
2131
" \"%s\"\n", interface);
2024
2132
}
2030
2138
2031
2139
/* Run network hooks */
2032
2140
{
2033
2034
2141
if(mc.interfaces != NULL){
2035
2142
interfaces_hooks = malloc(mc.interfaces_size);
2036
2143
if(interfaces_hooks == NULL){
2038
2145
goto end;
2039
2146
}
2040
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2041
interfaces_hooks_size = mc.interfaces_size;
2042
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2043
(int)',');
2044
}
2045
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2046
interfaces_hooks : "", delay)){
2047
goto end;
2048
}
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
2049
2152
}
2050
2153
2051
2154
if(not debug){
2139
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2140
2243
direntries[i]->d_name);
2141
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2142
2246
perror_plus("argz_add");
2143
2247
continue;
2144
2248
}
2156
2260
}
2157
2261
}
2158
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
}
2281
}
2282
break;
2283
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2159
2304
/* If we only got one interface, explicitly use only that one */
2160
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2161
2306
if(debug){
2165
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2166
2311
}
2167
2312
2168
/* Bring up interfaces which are down */
2169
if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1
2170
and strcmp(mc.interfaces, "none") == 0)){
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
bool interface_was_up = interface_is_up(interface);
2175
ret = bring_up_interface(interface, delay);
2176
if(not interface_was_up){
2177
if(ret != 0){
2178
errno = ret;
2179
perror_plus("Failed to bring up interface");
2180
} else {
2181
ret_errno = argz_add(&interfaces_to_take_down,
2182
&interfaces_to_take_down_size,
2183
interface);
2184
}
2185
}
2186
}
2187
free(mc.interfaces);
2188
mc.interfaces = NULL;
2189
mc.interfaces_size = 0;
2190
if(debug and (interfaces_to_take_down == NULL)){
2191
fprintf_plus(stderr, "No interfaces were brought up\n");
2192
}
2193
}
2194
2195
2313
if(quit_now){
2196
2314
goto end;
2197
2315
}
2255
2373
exitcode = EX_USAGE;
2256
2374
goto end;
2257
2375
}
2258
2376
2259
2377
if(quit_now){
2260
2378
goto end;
2261
2379
}
2291
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2292
2410
(int)retry_interval);
2293
2411
}
2294
sleep((int)retry_interval);
2412
sleep((unsigned int)retry_interval);
2295
2413
}
2296
2414
2297
if (not quit_now){
2415
if(not quit_now){
2298
2416
exitcode = EXIT_SUCCESS;
2299
2417
}
2300
2418
2370
2488
}
2371
2489
2372
2490
/* Cleanup things */
2491
free(mc.interfaces);
2492
2373
2493
if(sb != NULL)
2374
2494
avahi_s_service_browser_free(sb);
2375
2495
2400
2520
}
2401
2521
}
2402
2522
2403
/* Re-raise priviliges */
2523
/* Re-raise privileges */
2404
2524
{
2405
raise_privileges();
2406
2407
/* Run network hooks */
2408
run_network_hooks("stop", interfaces_hooks != NULL ?
2409
interfaces_hooks : "", delay);
2410
2411
/* Take down the network interfaces which were brought up */
2412
{
2413
char *interface = NULL;
2414
while((interface=argz_next(interfaces_to_take_down,
2415
interfaces_to_take_down_size,
2416
interface))){
2417
ret_errno = take_down_interface(interface);
2418
if(ret_errno != 0){
2419
errno = ret_errno;
2420
perror_plus("Failed to take down interface");
2421
}
2422
}
2423
if(debug and (interfaces_to_take_down == NULL)){
2424
fprintf_plus(stderr, "No interfaces needed to be taken"
2425
" down\n");
2426
}
2427
}
2428
2429
lower_privileges_permanently();
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2430
2556
}
2431
2557
2432
2558
free(interfaces_to_take_down);
2438
2564
struct dirent *direntry = NULL;
2439
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2440
2566
alphasort);
2441
if (numentries > 0){
2567
if(numentries > 0){
2442
2568
for(int i = 0; i < numentries; i++){
2443
2569
direntry = direntries[i];
2444
2570
char *fullname = NULL;
2459
2585
2460
2586
/* need to clean even if 0 because man page doesn't specify */
2461
2587
free(direntries);
2462
if (numentries == -1){
2588
if(numentries == -1){
2463
2589
perror_plus("scandir");
2464
2590
}
2465
2591
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0