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237.24.1
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-05-23 20:18:34 UTC
- mto: (237.7.304 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150523201834-e89ex4ito93yni8x
mandos: Use multiprocessing module to run checkers.
For a long time, the Mandos server has occasionally logged the message
"ERROR: Child process vanished". This was never a fatal error, but it
has been annoying and slightly worrying, since a definite cause was
not found. One potential cause could be the "multiprocessing" and
"subprocess" modules conflicting w.r.t. SIGCHLD. To avoid this,
change the running of checkers from using subprocess.Popen
asynchronously to instead first create a multiprocessing.Process()
(which is asynchronous) calling a function, and have that function
then call subprocess.call() (which is synchronous). In this way, the
only thing using any asynchronous subprocesses is the multiprocessing
module.
This makes it necessary to change one small thing in the D-Bus API,
since the subprocesses.call() function does not expose the raw wait(2)
status value.
DBUS-API (CheckerCompleted): Change the second value provided by this
D-Bus signal from the raw wait(2) status
to the actual terminating signal number.
mandos (subprocess_call_pipe): New function to be called by
multiprocessing.Process (starting a
separate process).
(Client.last_checker signal): New attribute for signal which
terminated last checker. Like
last_checker_status, only not accessible
via D-Bus.
(Client.checker_callback): Take new "connection" argument and use it
to get returncode; set last_checker_signal.
Return False so gobject does not call this
callback again.
(Client.start_checker): Start checker using a multiprocessing.Process
instead of a subprocess.Popen.
(ClientDBus.checker_callback): Take new "connection" argument. Call
Client.checker_callback early to have
it set last_checker_status and
last_checker_signal; use those. Change
second value provided to D-Bus signal
CheckerCompleted to use
last_checker_signal if checker was
terminated by signal.
mandos-monitor: Update to reflect DBus API change.
(MandosClientWidget.checker_completed): Take "signal" instead of
"condition" argument. Use it
accordingly. Remove dead code
(os.WCOREDUMP case).
For a long time, the Mandos server has occasionally logged the message
"ERROR: Child process vanished". This was never a fatal error, but it
has been annoying and slightly worrying, since a definite cause was
not found. One potential cause could be the "multiprocessing" and
"subprocess" modules conflicting w.r.t. SIGCHLD. To avoid this,
change the running of checkers from using subprocess.Popen
asynchronously to instead first create a multiprocessing.Process()
(which is asynchronous) calling a function, and have that function
then call subprocess.call() (which is synchronous). In this way, the
only thing using any asynchronous subprocesses is the multiprocessing
module.
This makes it necessary to change one small thing in the D-Bus API,
since the subprocesses.call() function does not expose the raw wait(2)
status value.
DBUS-API (CheckerCompleted): Change the second value provided by this
D-Bus signal from the raw wait(2) status
to the actual terminating signal number.
mandos (subprocess_call_pipe): New function to be called by
multiprocessing.Process (starting a
separate process).
(Client.last_checker signal): New attribute for signal which
terminated last checker. Like
last_checker_status, only not accessible
via D-Bus.
(Client.checker_callback): Take new "connection" argument and use it
to get returncode; set last_checker_signal.
Return False so gobject does not call this
callback again.
(Client.start_checker): Start checker using a multiprocessing.Process
instead of a subprocess.Popen.
(ClientDBus.checker_callback): Take new "connection" argument. Call
Client.checker_callback early to have
it set last_checker_status and
last_checker_signal; use those. Change
second value provided to D-Bus signal
CheckerCompleted to use
last_checker_signal if checker was
terminated by signal.
mandos-monitor: Update to reflect DBus API change.
(MandosClientWidget.checker_completed): Take "signal" instead of
"condition" argument. Use it
accordingly. Remove dead code
(os.WCOREDUMP case).
- 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);
187
192
188
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
194
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
196
}
192
197
193
198
/*
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