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- Committer: Teddy Hogeborn
- Date: 2015-03-10 18:52:09 UTC
- Revision ID: teddy@recompile.se-20150310185209-lxuovbu09zwyk9bx
Automatically determine the number of DH bits in the TLS handshake.
Instead of using a default value of 1024, check the OpenPGP key and
determine an appropriate number of DH bits to use, (using GnuTLS
functions made for this). Document this new default behavior.
* plugins.d/mandos-client.c (safe_string): New function.
(init_gnutls_global): If not specified, determine the number of DH
bits to use, based on the OpenPGP key.
* plugins.d/mandos-client.xml (OPTIONS): Document this new default of
the --dh-bits option.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
Instead of using a default value of 1024, check the OpenPGP key and
determine an appropriate number of DH bits to use, (using GnuTLS
functions made for this). Document this new default behavior.
* plugins.d/mandos-client.c (safe_string): New function.
(init_gnutls_global): If not specified, determine the number of DH
bits to use, based on the OpenPGP key.
* plugins.d/mandos-client.xml (OPTIONS): Document this new default of
the --dh-bits option.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
- files added:
- debian/upstream
- files modified:
- DBUS-API
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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
91
93
argz_delete(), argz_append(),
92
94
argz_stringify(), argz_add(),
93
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
94
98
95
99
#ifdef __linux__
96
100
#include <sys/klog.h> /* klogctl() */
138
142
static const char sys_class_net[] = "/sys/class/net";
139
143
char *connect_to = NULL;
140
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
141
146
uid_t uid = 65534;
142
147
gid_t gid = 65534;
143
148
180
185
perror(print_text);
181
186
}
182
187
183
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
189
int fprintf_plus(FILE *stream, const char *format, ...){
185
190
va_list ap;
186
191
va_start (ap, format);
195
200
* bytes. "buffer_capacity" is how much is currently allocated,
196
201
* "buffer_length" is how much is already used.
197
202
*/
203
__attribute__((nonnull, warn_unused_result))
198
204
size_t incbuffer(char **buffer, size_t buffer_length,
199
205
size_t buffer_capacity){
200
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
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;
203
213
return 0;
204
214
}
215
*buffer = new_buf;
205
216
buffer_capacity += BUFFER_SIZE;
206
217
}
207
218
return buffer_capacity;
208
219
}
209
220
210
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
211
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
224
int af, server **current_server){
213
225
int ret;
222
234
.af = af };
223
235
if(new_server->ip == NULL){
224
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
225
252
return false;
226
253
}
227
254
/* Special case of first server */
229
256
new_server->next = new_server;
230
257
new_server->prev = new_server;
231
258
*current_server = new_server;
232
/* Place the new server last in the list */
233
259
} else {
260
/* Place the new server last in the list */
234
261
new_server->next = *current_server;
235
262
new_server->prev = (*current_server)->prev;
236
263
new_server->prev->next = new_server;
237
264
(*current_server)->prev = new_server;
238
265
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
266
return true;
245
267
}
246
268
247
269
/*
248
270
* Initialize GPGME.
249
271
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
252
277
gpgme_error_t rc;
253
278
gpgme_engine_info_t engine_info;
254
279
255
280
/*
256
281
* Helper function to insert pub and seckey to the engine keyring.
257
282
*/
258
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
259
284
int ret;
260
285
int fd;
261
286
gpgme_data_t pgp_data;
342
367
* Decrypt OpenPGP data.
343
368
* Returns -1 on error
344
369
*/
370
__attribute__((nonnull, warn_unused_result))
345
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
372
size_t crypto_size,
347
373
char **plaintext,
467
493
return plaintext_length;
468
494
}
469
495
470
static const char * safer_gnutls_strerror(int value){
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
471
505
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
506
return safe_string(ret);
475
507
}
476
508
477
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
478
511
static void debuggnutls(__attribute__((unused)) int level,
479
512
const char* string){
480
513
fprintf_plus(stderr, "GnuTLS: %s", string);
481
514
}
482
515
516
__attribute__((nonnull, warn_unused_result))
483
517
static int init_gnutls_global(const char *pubkeyfilename,
484
518
const char *seckeyfilename,
485
519
mandos_context *mc){
486
520
int ret;
521
unsigned int uret;
487
522
488
523
if(debug){
489
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
540
575
safer_gnutls_strerror(ret));
541
576
goto globalfail;
542
577
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
543
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
680
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
547
683
goto globalfail;
548
684
}
549
685
559
695
return -1;
560
696
}
561
697
698
__attribute__((nonnull, warn_unused_result))
562
699
static int init_gnutls_session(gnutls_session_t *session,
563
700
mandos_context *mc){
564
701
int ret;
621
758
__attribute__((unused)) const char *txt){}
622
759
623
760
/* Called when a Mandos server is found */
761
__attribute__((nonnull, warn_unused_result))
624
762
static int start_mandos_communication(const char *ip, in_port_t port,
625
763
AvahiIfIndex if_index,
626
764
int af, mandos_context *mc){
627
765
int ret, tcp_sd = -1;
628
766
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
767
struct sockaddr_storage to;
633
768
char *buffer = NULL;
634
769
char *decrypted_buffer = NULL;
635
770
size_t buffer_length = 0;
716
851
717
852
memset(&to, 0, sizeof(to));
718
853
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
721
856
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
724
859
}
725
860
if(ret < 0 ){
726
861
int e = errno;
735
870
goto mandos_end;
736
871
}
737
872
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*/
873
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
874
if(IN6_IS_ADDR_LINKLOCAL
875
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
742
876
if(if_index == AVAHI_IF_UNSPEC){
743
877
fprintf_plus(stderr, "An IPv6 link-local address is"
744
878
" incomplete without a network interface\n");
746
880
goto mandos_end;
747
881
}
748
882
/* Set the network interface number as scope */
749
to.in6.sin6_scope_id = (uint32_t)if_index;
883
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
750
884
}
751
885
} else {
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
886
((struct sockaddr_in *)&to)->sin_port = htons(port);
755
887
}
756
888
757
889
if(quit_now){
774
906
}
775
907
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
908
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
777
const char *pcret;
778
909
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
913
NI_NUMERICHOST);
781
914
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
918
NI_NUMERICHOST);
784
919
}
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
}
920
if(ret == EAI_SYSTEM){
921
perror_plus("getnameinfo");
922
} else if(ret != 0) {
923
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
924
} else if(strcmp(addrstr, ip) != 0){
925
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
791
926
}
792
927
}
793
928
797
932
}
798
933
799
934
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
801
937
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
803
940
}
804
941
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
943
int e = errno;
807
944
perror_plus("connect");
808
945
errno = e;
1023
1160
return retval;
1024
1161
}
1025
1162
1163
__attribute__((nonnull))
1026
1164
static void resolve_callback(AvahiSServiceResolver *r,
1027
1165
AvahiIfIndex interface,
1028
1166
AvahiProtocol proto,
1036
1174
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1175
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1176
flags,
1039
void* mc){
1177
void *mc){
1040
1178
if(r == NULL){
1041
1179
return;
1042
1180
}
1045
1183
timed out */
1046
1184
1047
1185
if(quit_now){
1186
avahi_s_service_resolver_free(r);
1048
1187
return;
1049
1188
}
1050
1189
1095
1234
const char *domain,
1096
1235
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1236
flags,
1098
void* mc){
1237
void *mc){
1099
1238
if(b == NULL){
1100
1239
return;
1101
1240
}
1161
1300
errno = old_errno;
1162
1301
}
1163
1302
1303
__attribute__((nonnull, warn_unused_result))
1164
1304
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1305
int ret;
1166
1306
error_t ret_errno;
1185
1325
return true;
1186
1326
}
1187
1327
1328
__attribute__((nonnull, warn_unused_result))
1188
1329
bool good_flags(const char *ifname, const struct ifreq *ifr){
1189
1330
1190
1331
/* Reject the loopback device */
1232
1373
* corresponds to an acceptable network device.
1233
1374
* (This function is passed to scandir(3) as a filter function.)
1234
1375
*/
1376
__attribute__((nonnull, warn_unused_result))
1235
1377
int good_interface(const struct dirent *if_entry){
1236
1378
if(if_entry->d_name[0] == '.'){
1237
1379
return 0;
1255
1397
/*
1256
1398
* This function determines if a network interface is up.
1257
1399
*/
1400
__attribute__((nonnull, warn_unused_result))
1258
1401
bool interface_is_up(const char *interface){
1259
1402
struct ifreq ifr;
1260
1403
if(not get_flags(interface, &ifr)){
1271
1414
/*
1272
1415
* This function determines if a network interface is running
1273
1416
*/
1417
__attribute__((nonnull, warn_unused_result))
1274
1418
bool interface_is_running(const char *interface){
1275
1419
struct ifreq ifr;
1276
1420
if(not get_flags(interface, &ifr)){
1284
1428
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1285
1429
}
1286
1430
1431
__attribute__((nonnull, pure, warn_unused_result))
1287
1432
int notdotentries(const struct dirent *direntry){
1288
1433
/* Skip "." and ".." */
1289
1434
if(direntry->d_name[0] == '.'
1296
1441
}
1297
1442
1298
1443
/* Is this directory entry a runnable program? */
1444
__attribute__((nonnull, warn_unused_result))
1299
1445
int runnable_hook(const struct dirent *direntry){
1300
1446
int ret;
1301
1447
size_t sret;
1309
1455
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
1456
"abcdefghijklmnopqrstuvwxyz"
1311
1457
"0123456789"
1312
"_-");
1458
"_.-");
1313
1459
if((direntry->d_name)[sret] != '\0'){
1314
1460
/* Contains non-allowed characters */
1315
1461
if(debug){
1319
1465
return 0;
1320
1466
}
1321
1467
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);
1468
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1330
1469
if(ret == -1){
1331
1470
if(debug){
1332
1471
perror_plus("Could not stat hook");
1356
1495
return 1;
1357
1496
}
1358
1497
1498
__attribute__((nonnull, warn_unused_result))
1359
1499
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
1500
mandos_context *mc){
1361
1501
int ret;
1365
1505
1366
1506
while(true){
1367
1507
if(mc->current_server == NULL){
1368
if (debug){
1508
if(debug){
1369
1509
fprintf_plus(stderr, "Wait until first server is found."
1370
1510
" No timeout!\n");
1371
1511
}
1372
1512
ret = avahi_simple_poll_iterate(s, -1);
1373
1513
} else {
1374
if (debug){
1514
if(debug){
1375
1515
fprintf_plus(stderr, "Check current_server if we should run"
1376
1516
" it, or wait\n");
1377
1517
}
1394
1534
- ((intmax_t)waited_time.tv_sec * 1000))
1395
1535
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1536
1397
if (debug){
1537
if(debug){
1398
1538
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
1539
block_time);
1400
1540
}
1422
1562
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
1563
}
1424
1564
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1565
if(ret > 0 or errno != EINTR){
1426
1566
return (ret != 1) ? ret : 0;
1427
1567
}
1428
1568
}
1430
1570
}
1431
1571
1432
1572
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1433
1574
error_t raise_privileges(void){
1434
1575
error_t old_errno = errno;
1435
1576
error_t ret_errno = 0;
1436
1577
if(seteuid(0) == -1){
1437
1578
ret_errno = errno;
1438
perror_plus("seteuid");
1439
1579
}
1440
1580
errno = old_errno;
1441
1581
return ret_errno;
1442
1582
}
1443
1583
1444
1584
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1445
1586
error_t raise_privileges_permanently(void){
1446
1587
error_t old_errno = errno;
1447
1588
error_t ret_errno = raise_privileges();
1451
1592
}
1452
1593
if(setuid(0) == -1){
1453
1594
ret_errno = errno;
1454
perror_plus("seteuid");
1455
1595
}
1456
1596
errno = old_errno;
1457
1597
return ret_errno;
1458
1598
}
1459
1599
1460
1600
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1461
1602
error_t lower_privileges(void){
1462
1603
error_t old_errno = errno;
1463
1604
error_t ret_errno = 0;
1464
1605
if(seteuid(uid) == -1){
1465
1606
ret_errno = errno;
1466
perror_plus("seteuid");
1467
1607
}
1468
1608
errno = old_errno;
1469
1609
return ret_errno;
1470
1610
}
1471
1611
1472
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1473
1614
error_t lower_privileges_permanently(void){
1474
1615
error_t old_errno = errno;
1475
1616
error_t ret_errno = 0;
1476
1617
if(setuid(uid) == -1){
1477
1618
ret_errno = errno;
1478
perror_plus("setuid");
1479
1619
}
1480
1620
errno = old_errno;
1481
1621
return ret_errno;
1482
1622
}
1483
1623
1484
bool run_network_hooks(const char *mode, const char *interface,
1624
__attribute__((nonnull))
1625
void run_network_hooks(const char *mode, const char *interface,
1485
1626
const float delay){
1486
struct dirent **direntries;
1627
struct dirent **direntries = NULL;
1628
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1630
if(hookdir_fd == -1){
1631
if(errno == ENOENT){
1632
if(debug){
1633
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1634
" found\n", hookdir);
1635
}
1636
} else {
1637
perror_plus("open");
1638
}
1639
return;
1640
}
1641
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
1654
if(numhooks == -1){
1655
perror_plus("scandir");
1656
return;
1657
}
1487
1658
struct dirent *direntry;
1488
1659
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");
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[i];
1663
if(debug){
1664
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1665
direntry->d_name);
1499
1666
}
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){
1667
pid_t hook_pid = fork();
1668
if(hook_pid == 0){
1669
/* Child */
1670
/* Raise privileges */
1671
errno = raise_privileges_permanently();
1672
if(errno != 0){
1673
perror_plus("Failed to raise privileges");
1674
_exit(EX_NOPERM);
1675
}
1676
/* Set group */
1677
errno = 0;
1678
ret = setgid(0);
1679
if(ret == -1){
1680
perror_plus("setgid");
1681
_exit(EX_NOPERM);
1682
}
1683
/* Reset supplementary groups */
1684
errno = 0;
1685
ret = setgroups(0, NULL);
1686
if(ret == -1){
1687
perror_plus("setgroups");
1688
_exit(EX_NOPERM);
1689
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1706
if(ret == -1){
1707
perror_plus("setenv");
1708
_exit(EX_OSERR);
1709
}
1710
ret = setenv("DEVICE", interface, 1);
1711
if(ret == -1){
1712
perror_plus("setenv");
1713
_exit(EX_OSERR);
1714
}
1715
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1716
if(ret == -1){
1717
perror_plus("setenv");
1718
_exit(EX_OSERR);
1719
}
1720
ret = setenv("MODE", mode, 1);
1721
if(ret == -1){
1722
perror_plus("setenv");
1723
_exit(EX_OSERR);
1724
}
1725
char *delaystring;
1726
ret = asprintf(&delaystring, "%f", (double)delay);
1727
if(ret == -1){
1507
1728
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
}
1729
_exit(EX_OSERR);
1730
}
1731
ret = setenv("DELAY", delaystring, 1);
1732
if(ret == -1){
1566
1733
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
}
1734
perror_plus("setenv");
1735
_exit(EX_OSERR);
1736
}
1737
free(delaystring);
1738
if(connect_to != NULL){
1739
ret = setenv("CONNECT", connect_to, 1);
1740
if(ret == -1){
1741
perror_plus("setenv");
1742
_exit(EX_OSERR);
1743
}
1744
}
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1746
if(hook_fd == -1){
1747
perror_plus("openat");
1748
_exit(EXIT_FAILURE);
1749
}
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1751
perror_plus("close");
1752
_exit(EXIT_FAILURE);
1753
}
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1755
environ) == -1){
1756
perror_plus("fexecve");
1757
_exit(EXIT_FAILURE);
1758
}
1759
} else {
1760
if(hook_pid == -1){
1761
perror_plus("fork");
1762
free(direntry);
1763
continue;
1764
}
1765
int status;
1766
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
perror_plus("waitpid");
1768
free(direntry);
1769
continue;
1770
}
1771
if(WIFEXITED(status)){
1772
if(WEXITSTATUS(status) != 0){
1773
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1774
" with status %d\n", direntry->d_name,
1775
WEXITSTATUS(status));
1776
free(direntry);
1777
continue;
1778
}
1779
} else if(WIFSIGNALED(status)){
1780
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1781
" signal %d\n", direntry->d_name,
1782
WTERMSIG(status));
1783
free(direntry);
1784
continue;
1578
1785
} 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;
1786
fprintf_plus(stderr, "Warning: network hook \"%s\""
1787
" crashed\n", direntry->d_name);
1788
free(direntry);
1789
continue;
1790
}
1791
}
1792
if(debug){
1793
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1794
direntry->d_name);
1795
}
1796
free(direntry);
1797
}
1798
free(direntries);
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1800
perror_plus("close");
1801
} else {
1802
hookdir_fd = -1;
1803
}
1804
close(devnull);
1615
1805
}
1616
1806
1807
__attribute__((nonnull, warn_unused_result))
1617
1808
error_t bring_up_interface(const char *const interface,
1618
1809
const float delay){
1619
int sd = -1;
1620
1810
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1811
int ret;
1623
1812
struct ifreq network;
1624
1813
unsigned int if_index = if_nametoindex(interface);
1625
1814
if(if_index == 0){
1634
1823
}
1635
1824
1636
1825
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1826
error_t ret_errno = 0, ioctl_errno = 0;
1827
if(not get_flags(interface, &network)){
1638
1828
ret_errno = errno;
1639
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1640
1830
"\"%s\"\n", interface);
1831
errno = old_errno;
1641
1832
return ret_errno;
1642
1833
}
1643
network.ifr_flags |= IFF_UP;
1834
network.ifr_flags |= IFF_UP; /* set flag */
1644
1835
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1836
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1837
if(sd == -1){
1647
1838
ret_errno = errno;
1648
1839
perror_plus("socket");
1649
1840
errno = old_errno;
1650
1841
return ret_errno;
1651
1842
}
1652
1843
1653
1844
if(quit_now){
1654
close(sd);
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1655
1849
errno = old_errno;
1656
1850
return EINTR;
1657
1851
}
1661
1855
interface);
1662
1856
}
1663
1857
1664
/* Raise priviliges */
1665
raise_privileges();
1858
/* Raise privileges */
1859
ret_errno = raise_privileges();
1860
if(ret_errno != 0){
1861
errno = ret_errno;
1862
perror_plus("Failed to raise privileges");
1863
}
1666
1864
1667
1865
#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");
1866
int ret_linux;
1867
bool restore_loglevel = false;
1868
if(ret_errno == 0){
1869
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1870
messages about the network interface to mess up the prompt */
1871
ret_linux = klogctl(8, NULL, 5);
1872
if(ret_linux == -1){
1873
perror_plus("klogctl");
1874
} else {
1875
restore_loglevel = true;
1876
}
1675
1877
}
1676
1878
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1879
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1880
ioctl_errno = errno;
1679
1881
#ifdef __linux__
1680
1882
if(restore_loglevel){
1681
1883
ret_linux = klogctl(7, NULL, 0);
1685
1887
}
1686
1888
#endif /* __linux__ */
1687
1889
1688
/* Lower privileges */
1689
lower_privileges();
1890
/* If raise_privileges() succeeded above */
1891
if(ret_errno == 0){
1892
/* Lower privileges */
1893
ret_errno = lower_privileges();
1894
if(ret_errno != 0){
1895
errno = ret_errno;
1896
perror_plus("Failed to lower privileges");
1897
}
1898
}
1690
1899
1691
1900
/* Close the socket */
1692
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1695
1904
}
1696
1905
1697
1906
if(ret_setflags == -1){
1698
errno = ret_errno;
1907
errno = ioctl_errno;
1699
1908
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
1909
errno = old_errno;
1701
return ret_errno;
1910
return ioctl_errno;
1702
1911
}
1703
1912
} else if(debug){
1704
1913
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1722
1931
return 0;
1723
1932
}
1724
1933
1934
__attribute__((nonnull, warn_unused_result))
1725
1935
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
1936
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
1937
struct ifreq network;
1731
1938
unsigned int if_index = if_nametoindex(interface);
1732
1939
if(if_index == 0){
1735
1942
return ENXIO;
1736
1943
}
1737
1944
if(interface_is_up(interface)){
1945
error_t ret_errno = 0, ioctl_errno = 0;
1738
1946
if(not get_flags(interface, &network) and debug){
1739
1947
ret_errno = errno;
1740
1948
fprintf_plus(stderr, "Failed to get flags for interface "
1741
1949
"\"%s\"\n", interface);
1950
errno = old_errno;
1742
1951
return ret_errno;
1743
1952
}
1744
1953
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1954
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1955
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1956
if(sd == -1){
1748
1957
ret_errno = errno;
1749
1958
perror_plus("socket");
1750
1959
errno = old_errno;
1756
1965
interface);
1757
1966
}
1758
1967
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();
1968
/* Raise privileges */
1969
ret_errno = raise_privileges();
1970
if(ret_errno != 0){
1971
errno = ret_errno;
1972
perror_plus("Failed to raise privileges");
1973
}
1974
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1767
1987
1768
1988
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
1990
if(ret == -1){
1771
1991
perror_plus("close");
1772
1992
}
1773
1993
1774
1994
if(ret_setflags == -1){
1775
errno = ret_errno;
1995
errno = ioctl_errno;
1776
1996
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
1997
errno = old_errno;
1778
return ret_errno;
1998
return ioctl_errno;
1779
1999
}
1780
2000
} else if(debug){
1781
2001
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
2007
}
1788
2008
1789
2009
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2010
mandos_context mc = { .server = NULL, .dh_bits = 0,
1791
2011
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
1793
2013
.interfaces = NULL, .interfaces_size = 0 };
1794
2014
AvahiSServiceBrowser *sb = NULL;
1795
2015
error_t ret_errno;
1799
2019
int exitcode = EXIT_SUCCESS;
1800
2020
char *interfaces_to_take_down = NULL;
1801
2021
size_t interfaces_to_take_down_size = 0;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2022
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2023
char old_tempdir[] = "/tmp/mandosXXXXXX";
2024
char *tempdir = NULL;
1804
2025
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
2026
const char *seckey = PATHDIR "/" SECKEY;
1806
2027
const char *pubkey = PATHDIR "/" PUBKEY;
1807
2028
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
2029
1810
2030
bool gnutls_initialized = false;
1811
2031
bool gpgme_initialized = false;
1989
2209
/* Work around Debian bug #633582:
1990
2210
<http://bugs.debian.org/633582> */
1991
2211
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2212
/* Re-raise privileges */
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2216
perror_plus("Failed to raise privileges");
2217
} else {
1994
2218
struct stat st;
1995
2219
1996
2220
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2036
2260
}
2037
2261
2038
2262
/* Lower privileges */
2039
lower_privileges();
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2040
2268
}
2041
2269
}
2042
2270
2066
2294
goto end;
2067
2295
}
2068
2296
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
}
2297
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2298
}
2299
run_network_hooks("start", interfaces_hooks != NULL ?
2300
interfaces_hooks : "", delay);
2077
2301
}
2078
2302
2079
2303
if(not debug){
2157
2381
2158
2382
/* If no interfaces were specified, make a list */
2159
2383
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2384
struct dirent **direntries = NULL;
2161
2385
/* Look for any good interfaces */
2162
2386
ret = scandir(sys_class_net, &direntries, good_interface,
2163
2387
alphasort);
2167
2391
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
2392
direntries[i]->d_name);
2169
2393
if(ret_errno != 0){
2394
errno = ret_errno;
2170
2395
perror_plus("argz_add");
2396
free(direntries[i]);
2171
2397
continue;
2172
2398
}
2173
2399
if(debug){
2174
2400
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
2401
direntries[i]->d_name);
2176
2402
}
2403
free(direntries[i]);
2177
2404
}
2178
2405
free(direntries);
2179
2406
} else {
2180
free(direntries);
2407
if(ret == 0){
2408
free(direntries);
2409
}
2181
2410
fprintf_plus(stderr, "Could not find a network interface\n");
2182
2411
exitcode = EXIT_FAILURE;
2183
2412
goto end;
2206
2435
break;
2207
2436
}
2208
2437
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2438
errno = bring_up_interface(interface, delay);
2210
2439
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2440
if(errno != 0){
2213
2441
perror_plus("Failed to bring up interface");
2214
2442
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2443
errno = argz_add(&interfaces_to_take_down,
2444
&interfaces_to_take_down_size,
2445
interface);
2446
if(errno != 0){
2447
perror_plus("argz_add");
2448
}
2218
2449
}
2219
2450
}
2220
2451
}
2249
2480
goto end;
2250
2481
}
2251
2482
2252
if(mkdtemp(tempdir) == NULL){
2483
/* Try /run/tmp before /tmp */
2484
tempdir = mkdtemp(run_tempdir);
2485
if(tempdir == NULL and errno == ENOENT){
2486
if(debug){
2487
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2488
run_tempdir, old_tempdir);
2489
}
2490
tempdir = mkdtemp(old_tempdir);
2491
}
2492
if(tempdir == NULL){
2253
2493
perror_plus("mkdtemp");
2254
2494
goto end;
2255
2495
}
2256
tempdir_created = true;
2257
2496
2258
2497
if(quit_now){
2259
2498
goto end;
2334
2573
sleep((unsigned int)retry_interval);
2335
2574
}
2336
2575
2337
if (not quit_now){
2576
if(not quit_now){
2338
2577
exitcode = EXIT_SUCCESS;
2339
2578
}
2340
2579
2395
2634
if(debug){
2396
2635
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
2636
}
2398
2637
2399
2638
ret = avahi_loop_with_timeout(simple_poll,
2400
2639
(int)(retry_interval * 1000), &mc);
2401
2640
if(debug){
2437
2676
mc.current_server->prev->next = NULL;
2438
2677
while(mc.current_server != NULL){
2439
2678
server *next = mc.current_server->next;
2679
#ifdef __GNUC__
2680
#pragma GCC diagnostic push
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
2682
#endif
2683
free((char *)(mc.current_server->ip));
2684
#ifdef __GNUC__
2685
#pragma GCC diagnostic pop
2686
#endif
2440
2687
free(mc.current_server);
2441
2688
mc.current_server = next;
2442
2689
}
2443
2690
}
2444
2691
2445
/* Re-raise priviliges */
2692
/* Re-raise privileges */
2446
2693
{
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();
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
2697
perror_plus("Failed to raise privileges");
2698
} else {
2699
2700
/* Run network hooks */
2701
run_network_hooks("stop", interfaces_hooks != NULL ?
2702
interfaces_hooks : "", delay);
2703
2704
/* Take down the network interfaces which were brought up */
2705
{
2706
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("Failed to take down interface");
2714
}
2715
}
2716
if(debug and (interfaces_to_take_down == NULL)){
2717
fprintf_plus(stderr, "No interfaces needed to be taken"
2718
" down\n");
2719
}
2720
}
2721
}
2722
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("Failed to lower privileges permanently");
2727
}
2472
2728
}
2473
2729
2474
2730
free(interfaces_to_take_down);
2475
2731
free(interfaces_hooks);
2476
2732
2477
2733
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
2734
if(tempdir != NULL){
2479
2735
struct dirent **direntries = NULL;
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);
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
2499
2773
}
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");
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2510
2775
}
2511
2776
}
2512
2777
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0