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- Committer: Teddy Hogeborn
- Date: 2009-02-13 08:00:47 UTC
- mfrom: (237.2.78 mandos)
- Revision ID: teddy@fukt.bsnet.se-20090213080047-eibfmj4j2a9zt53d
Merge from trunk. Notable changes:
1. Server package now depends on "python-gobject".
2. Permission fix for /lib64.
3. Support for DEVICE setting from initramfs.conf, kernel parameters
"ip=" and "mandos=connect".
4. Fix for the bug where the server would stop responding, with a
zombie checker process.
5. Add support for disabling IPv6 in the server
6. Fix for the bug which made the server, plugin-runner and
mandos-client fail to change group ID.
7. Add GnuTLS debugging to server debug output.
8. Fix for the bug of the "--options-for" option of plugin-runner,
where it would cut the value at the first colon character.
9. Stop using sscanf() throughout, since it does not detect overflow.
10. Fix for the bug where plugin-runner would not go to the fallback
if all plugins failed.
11. Fix for the bug where mandos-client would not clean up after a
signal.
12. Added support for connecting to IPv4 addresses in mandos-client.
13. Added support for not using a specific network interface in
mandos-client.
14. Kernel log level will be lowered by mandos-client while bringing
up the network interface.
15. Add an option for the maximum time for mandos-client to wait for
the network interface to come up.
16. Fix for the bug where mandos-client would not clean the temporary
directory on some filesystems.
1. Server package now depends on "python-gobject".
2. Permission fix for /lib64.
3. Support for DEVICE setting from initramfs.conf, kernel parameters
"ip=" and "mandos=connect".
4. Fix for the bug where the server would stop responding, with a
zombie checker process.
5. Add support for disabling IPv6 in the server
6. Fix for the bug which made the server, plugin-runner and
mandos-client fail to change group ID.
7. Add GnuTLS debugging to server debug output.
8. Fix for the bug of the "--options-for" option of plugin-runner,
where it would cut the value at the first colon character.
9. Stop using sscanf() throughout, since it does not detect overflow.
10. Fix for the bug where plugin-runner would not go to the fallback
if all plugins failed.
11. Fix for the bug where mandos-client would not clean up after a
signal.
12. Added support for connecting to IPv4 addresses in mandos-client.
13. Added support for not using a specific network interface in
mandos-client.
14. Kernel log level will be lowered by mandos-client while bringing
up the network interface.
15. Add an option for the maximum time for mandos-client to wait for
the network interface to come up.
16. Fix for the bug where mandos-client would not clean the temporary
directory on some filesystems.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
43
39
stdout, ferror(), remove() */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
48
44
#include <stdbool.h> /* bool, false, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
53
49
sockaddr_in6, PF_INET6,
54
50
SOCK_STREAM, uid_t, gid_t, open(),
55
51
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
#include <sys/stat.h> /* open() */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
54
inet_pton(), connect() */
59
55
#include <fcntl.h> /* open() */
62
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
59
strtoimax() */
64
60
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
78
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
88
81
89
82
#ifdef __linux__
90
83
#include <sys/klog.h> /* klogctl() */
123
116
#define PATHDIR "/conf/conf.d/mandos"
124
117
#define SECKEY "seckey.txt"
125
118
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
127
119
128
120
bool debug = false;
129
121
static const char mandos_protocol_version[] = "1";
130
122
const char *argp_program_version = "mandos-client " VERSION;
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
static const char sys_class_net[] = "/sys/class/net";
133
char *connect_to = NULL;
134
135
/* Doubly linked list that need to be circularly linked when used */
136
typedef struct server{
137
const char *ip;
138
uint16_t port;
139
AvahiIfIndex if_index;
140
int af;
141
struct timespec last_seen;
142
struct server *next;
143
struct server *prev;
144
} server;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
145
124
146
125
/* Used for passing in values through the Avahi callback functions */
147
126
typedef struct {
152
131
gnutls_dh_params_t dh_params;
153
132
const char *priority;
154
133
gpgme_ctx_t ctx;
155
server *current_server;
156
134
} mandos_context;
157
135
158
136
/* global context so signal handler can reach it*/
159
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
138
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
163
164
sig_atomic_t quit_now = 0;
165
int signal_received = 0;
166
167
/* Function to use when printing errors */
168
void perror_plus(const char *print_text){
169
fprintf(stderr, "Mandos plugin %s: ",
170
program_invocation_short_name);
171
perror(print_text);
172
}
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
140
174
141
/*
175
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
155
return buffer_capacity;
189
156
}
190
157
191
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
195
int ret;
196
server *new_server = malloc(sizeof(server));
197
if(new_server == NULL){
198
perror_plus("malloc");
199
return -1;
200
}
201
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
205
if(new_server->ip == NULL){
206
perror_plus("strdup");
207
return -1;
208
}
209
/* Special case of first server */
210
if (mc.current_server == NULL){
211
new_server->next = new_server;
212
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
215
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
218
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
227
}
228
229
158
/*
230
159
* Initialize GPGME.
231
160
*/
232
161
static bool init_gpgme(const char *seckey,
233
162
const char *pubkey, const char *tempdir){
163
int ret;
234
164
gpgme_error_t rc;
235
165
gpgme_engine_info_t engine_info;
236
166
239
169
* Helper function to insert pub and seckey to the engine keyring.
240
170
*/
241
171
bool import_key(const char *filename){
242
int ret;
243
172
int fd;
244
173
gpgme_data_t pgp_data;
245
174
246
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
247
176
if(fd == -1){
248
perror_plus("open");
177
perror("open");
249
178
return false;
250
179
}
251
180
265
194
266
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
267
196
if(ret == -1){
268
perror_plus("close");
197
perror("close");
269
198
}
270
199
gpgme_data_release(pgp_data);
271
200
return true;
284
213
return false;
285
214
}
286
215
287
/* Set GPGME home directory for the OpenPGP engine only */
216
/* Set GPGME home directory for the OpenPGP engine only */
288
217
rc = gpgme_get_engine_info(&engine_info);
289
218
if(rc != GPG_ERR_NO_ERROR){
290
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
245
return false;
317
246
}
318
247
319
return true;
248
return true;
320
249
}
321
250
322
251
/*
376
305
}
377
306
gpgme_recipient_t recipient;
378
307
recipient = result->recipients;
379
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
386
recipient = recipient->next;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
387
318
}
388
319
}
389
320
}
396
327
397
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
398
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
399
perror_plus("gpgme_data_seek");
330
perror("gpgme_data_seek");
400
331
plaintext_length = -1;
401
332
goto decrypt_end;
402
333
}
407
338
(size_t)plaintext_length,
408
339
plaintext_capacity);
409
340
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
341
perror("incbuffer");
411
342
plaintext_length = -1;
412
343
goto decrypt_end;
413
344
}
420
351
break;
421
352
}
422
353
if(ret < 0){
423
perror_plus("gpgme_data_read");
354
perror("gpgme_data_read");
424
355
plaintext_length = -1;
425
356
goto decrypt_end;
426
357
}
483
414
}
484
415
485
416
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
417
gnutls_certificate_allocate_credentials(&mc.cred);
487
418
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
489
423
safer_gnutls_strerror(ret));
490
424
gnutls_global_deinit();
491
425
return -1;
538
472
static int init_gnutls_session(gnutls_session_t *session){
539
473
int ret;
540
474
/* GnuTLS session creation */
541
do {
542
ret = gnutls_init(session, GNUTLS_SERVER);
543
if(quit_now){
544
return -1;
545
}
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
475
ret = gnutls_init(session, GNUTLS_SERVER);
547
476
if(ret != GNUTLS_E_SUCCESS){
548
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
478
safer_gnutls_strerror(ret));
551
480
552
481
{
553
482
const char *err;
554
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
556
if(quit_now){
557
gnutls_deinit(*session);
558
return -1;
559
}
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
561
484
if(ret != GNUTLS_E_SUCCESS){
562
485
fprintf(stderr, "Syntax error at: %s\n", err);
563
486
fprintf(stderr, "GnuTLS error: %s\n",
567
490
}
568
491
}
569
492
570
do {
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
573
if(quit_now){
574
gnutls_deinit(*session);
575
return -1;
576
}
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
578
495
if(ret != GNUTLS_E_SUCCESS){
579
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
497
safer_gnutls_strerror(ret));
583
500
}
584
501
585
502
/* ignore client certificate if any. */
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
587
505
588
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
507
598
516
static int start_mandos_communication(const char *ip, uint16_t port,
599
517
AvahiIfIndex if_index,
600
518
int af){
601
int ret, tcp_sd = -1;
519
int ret, tcp_sd;
602
520
ssize_t sret;
603
521
union {
604
522
struct sockaddr_in in;
605
523
struct sockaddr_in6 in6;
606
524
} to;
607
525
char *buffer = NULL;
608
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
609
527
size_t buffer_length = 0;
610
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
611
530
size_t written;
612
int retval = -1;
531
int retval = 0;
613
532
gnutls_session_t session;
614
533
int pf; /* Protocol family */
615
534
616
errno = 0;
617
618
if(quit_now){
619
errno = EINTR;
620
return -1;
621
}
622
623
535
switch(af){
624
536
case AF_INET6:
625
537
pf = PF_INET6;
629
541
break;
630
542
default:
631
543
fprintf(stderr, "Bad address family: %d\n", af);
632
errno = EINVAL;
633
544
return -1;
634
545
}
635
546
645
556
646
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
647
558
if(tcp_sd < 0){
648
int e = errno;
649
perror_plus("socket");
650
errno = e;
651
goto mandos_end;
652
}
653
654
if(quit_now){
655
errno = EINTR;
656
goto mandos_end;
559
perror("socket");
560
return -1;
657
561
}
658
562
659
563
memset(&to, 0, sizeof(to));
660
564
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
662
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
663
567
} else { /* IPv4 */
664
568
to.in.sin_family = (sa_family_t)af;
665
569
ret = inet_pton(af, ip, &to.in.sin_addr);
666
570
}
667
571
if(ret < 0 ){
668
int e = errno;
669
perror_plus("inet_pton");
670
errno = e;
671
goto mandos_end;
572
perror("inet_pton");
573
return -1;
672
574
}
673
575
if(ret == 0){
674
int e = errno;
675
576
fprintf(stderr, "Bad address: %s\n", ip);
676
errno = e;
677
goto mandos_end;
577
return -1;
678
578
}
679
579
if(af == AF_INET6){
680
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
687
587
if(if_index == AVAHI_IF_UNSPEC){
688
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
589
" without a network interface\n");
690
errno = EINVAL;
691
goto mandos_end;
590
return -1;
692
591
}
693
592
/* Set the network interface number as scope */
694
593
to.in6.sin6_scope_id = (uint32_t)if_index;
699
598
-Wunreachable-code */
700
599
}
701
600
702
if(quit_now){
703
errno = EINTR;
704
goto mandos_end;
705
}
706
707
601
if(debug){
708
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
709
603
char interface[IF_NAMESIZE];
710
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
perror_plus("if_indextoname");
605
perror("if_indextoname");
712
606
} else {
713
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
608
ip, interface, port);
728
622
sizeof(addrstr));
729
623
}
730
624
if(pcret == NULL){
731
perror_plus("inet_ntop");
625
perror("inet_ntop");
732
626
} else {
733
627
if(strcmp(addrstr, ip) != 0){
734
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
736
630
}
737
631
}
738
632
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
633
if(af == AF_INET6){
745
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
635
} else {
747
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
637
}
749
638
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
639
perror("connect");
640
return -1;
761
641
}
762
642
763
643
const char *out = mandos_protocol_version;
767
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
648
out_size - written));
769
649
if(ret == -1){
770
int e = errno;
771
perror_plus("write");
772
errno = e;
650
perror("write");
651
retval = -1;
773
652
goto mandos_end;
774
653
}
775
654
written += (size_t)ret;
783
662
break;
784
663
}
785
664
}
786
787
if(quit_now){
788
errno = EINTR;
789
goto mandos_end;
790
}
791
665
}
792
666
793
667
if(debug){
794
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
795
669
}
796
670
797
if(quit_now){
798
errno = EINTR;
799
goto mandos_end;
800
}
801
802
/* Spurious warning from -Wint-to-pointer-cast */
803
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
804
672
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
do {
673
do{
811
674
ret = gnutls_handshake(session);
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
816
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
817
676
818
677
if(ret != GNUTLS_E_SUCCESS){
820
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
821
680
gnutls_perror(ret);
822
681
}
823
errno = EPROTO;
682
retval = -1;
824
683
goto mandos_end;
825
684
}
826
685
832
691
}
833
692
834
693
while(true){
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
694
buffer_capacity = incbuffer(&buffer, buffer_length,
842
695
buffer_capacity);
843
696
if(buffer_capacity == 0){
844
int e = errno;
845
perror_plus("incbuffer");
846
errno = e;
847
goto mandos_end;
848
}
849
850
if(quit_now){
851
errno = EINTR;
697
perror("incbuffer");
698
retval = -1;
852
699
goto mandos_end;
853
700
}
854
701
863
710
case GNUTLS_E_AGAIN:
864
711
break;
865
712
case GNUTLS_E_REHANDSHAKE:
866
do {
713
do{
867
714
ret = gnutls_handshake(session);
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
873
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
716
if(ret < 0){
875
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
876
718
gnutls_perror(ret);
877
errno = EPROTO;
719
retval = -1;
878
720
goto mandos_end;
879
721
}
880
722
break;
881
723
default:
882
724
fprintf(stderr, "Unknown error while reading data from"
883
725
" encrypted session with Mandos server\n");
726
retval = -1;
884
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
errno = EIO;
886
728
goto mandos_end;
887
729
}
888
730
} else {
894
736
fprintf(stderr, "Closing TLS session\n");
895
737
}
896
738
897
if(quit_now){
898
errno = EINTR;
899
goto mandos_end;
900
}
901
902
do {
903
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
if(quit_now){
905
errno = EINTR;
906
goto mandos_end;
907
}
908
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
909
740
910
741
if(buffer_length > 0){
911
ssize_t decrypted_buffer_size;
912
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
743
buffer_length,
914
744
&decrypted_buffer);
915
745
if(decrypted_buffer_size >= 0){
916
917
746
written = 0;
918
747
while(written < (size_t) decrypted_buffer_size){
919
if(quit_now){
920
errno = EINTR;
921
goto mandos_end;
922
}
923
924
748
ret = (int)fwrite(decrypted_buffer + written, 1,
925
749
(size_t)decrypted_buffer_size - written,
926
750
stdout);
927
751
if(ret == 0 and ferror(stdout)){
928
int e = errno;
929
752
if(debug){
930
753
fprintf(stderr, "Error writing encrypted data: %s\n",
931
754
strerror(errno));
932
755
}
933
errno = e;
934
goto mandos_end;
756
retval = -1;
757
break;
935
758
}
936
759
written += (size_t)ret;
937
760
}
938
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
939
764
}
765
} else {
766
retval = -1;
940
767
}
941
768
942
769
/* Shutdown procedure */
943
770
944
771
mandos_end:
945
{
946
int e = errno;
947
free(decrypted_buffer);
948
free(buffer);
949
if(tcp_sd >= 0){
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
951
}
952
if(ret == -1){
953
if(e == 0){
954
e = errno;
955
}
956
perror_plus("close");
957
}
958
gnutls_deinit(session);
959
errno = e;
960
if(quit_now){
961
errno = EINTR;
962
retval = -1;
963
}
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
964
776
}
777
gnutls_deinit(session);
965
778
return retval;
966
779
}
967
780
984
797
/* Called whenever a service has been resolved successfully or
985
798
timed out */
986
799
987
if(quit_now){
988
return;
989
}
990
991
800
switch(event){
992
801
default:
993
802
case AVAHI_RESOLVER_FAILURE:
1009
818
avahi_proto_to_af(proto));
1010
819
if(ret == 0){
1011
820
avahi_simple_poll_quit(mc.simple_poll);
1012
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1015
821
}
1016
822
}
1017
823
}
1033
839
/* Called whenever a new services becomes available on the LAN or
1034
840
is removed from the LAN */
1035
841
1036
if(quit_now){
1037
return;
1038
}
1039
1040
842
switch(event){
1041
843
default:
1042
844
case AVAHI_BROWSER_FAILURE:
1071
873
}
1072
874
}
1073
875
1074
/* Signal handler that stops main loop after SIGTERM */
1075
static void handle_sigterm(int sig){
876
sig_atomic_t quit_now = 0;
877
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
1076
880
if(quit_now){
1077
881
return;
1078
882
}
1079
883
quit_now = 1;
1080
signal_received = sig;
1081
884
int old_errno = errno;
1082
/* set main loop to exit */
1083
885
if(mc.simple_poll != NULL){
1084
886
avahi_simple_poll_quit(mc.simple_poll);
1085
887
}
1086
888
errno = old_errno;
1087
889
}
1088
890
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
int ret;
1091
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
if(s < 0){
1094
perror_plus("socket");
1095
return false;
1096
}
1097
strcpy(ifr->ifr_name, ifname);
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
if(ret == -1){
1100
if(debug){
1101
perror_plus("ioctl SIOCGIFFLAGS");
1102
}
1103
return false;
1104
}
1105
return true;
1106
}
1107
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1110
/* Reject the loopback device */
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1115
}
1116
return false;
1117
}
1118
/* Accept point-to-point devices only if connect_to is specified */
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1123
}
1124
return true;
1125
}
1126
/* Otherwise, reject non-broadcast-capable devices */
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1131
}
1132
return false;
1133
}
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
if(ifr->ifr_flags & IFF_NOARP){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1138
}
1139
return false;
1140
}
1141
1142
/* Accept this device */
1143
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1145
}
1146
return true;
1147
}
1148
1149
/*
1150
* This function determines if a directory entry in /sys/class/net
1151
* corresponds to an acceptable network device.
1152
* (This function is passed to scandir(3) as a filter function.)
1153
*/
1154
int good_interface(const struct dirent *if_entry){
1155
if(if_entry->d_name[0] == '.'){
1156
return 0;
1157
}
1158
1159
struct ifreq ifr;
1160
if(not get_flags(if_entry->d_name, &ifr)){
1161
if(debug){
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
int notdotentries(const struct dirent *direntry){
1218
/* Skip "." and ".." */
1219
if(direntry->d_name[0] == '.'
1220
and (direntry->d_name[1] == '\0'
1221
or (direntry->d_name[1] == '.'
1222
and direntry->d_name[2] == '\0'))){
1223
return 0;
1224
}
1225
return 1;
1226
}
1227
1228
/* Is this directory entry a runnable program? */
1229
int runnable_hook(const struct dirent *direntry){
1230
int ret;
1231
struct stat st;
1232
1233
if((direntry->d_name)[0] == '\0'){
1234
/* Empty name? */
1235
return 0;
1236
}
1237
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1255
if(ret == -1){
1256
if(debug){
1257
perror_plus("Could not stat plugin");
1258
}
1259
return 0;
1260
}
1261
if(not (S_ISREG(st.st_mode))){
1262
/* Not a regular file */
1263
return 0;
1264
}
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
/* Not executable */
1267
return 0;
1268
}
1269
return 1;
1270
}
1271
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1273
int ret;
1274
struct timespec now;
1275
struct timespec waited_time;
1276
intmax_t block_time;
1277
1278
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1283
}
1284
ret = avahi_simple_poll_iterate(s, -1);
1285
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1289
}
1290
/* the current time */
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1292
if(ret == -1){
1293
perror_plus("clock_gettime");
1294
return -1;
1295
}
1296
/* Calculating in ms how long time between now and server
1297
who we visted longest time ago. Now - last seen. */
1298
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1300
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1302
/* total time is 10s/10,000ms.
1303
Converting to s from ms by dividing by 1,000,
1304
and ns to ms by dividing by 1,000,000. */
1305
block_time = ((retry_interval
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1311
}
1312
1313
if(block_time <= 0){
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1318
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1320
return 0;
1321
}
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1324
if(ret == -1){
1325
perror_plus("clock_gettime");
1326
return -1;
1327
}
1328
mc.current_server = mc.current_server->next;
1329
block_time = 0; /* Call avahi to find new Mandos
1330
servers, but don't block */
1331
}
1332
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
}
1335
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1337
return (ret != 1) ? ret : 0;
1338
}
1339
}
1340
}
1341
}
1342
1343
891
int main(int argc, char *argv[]){
1344
892
AvahiSServiceBrowser *sb = NULL;
1345
893
int error;
1347
895
intmax_t tmpmax;
1348
896
char *tmp;
1349
897
int exitcode = EXIT_SUCCESS;
1350
const char *interface = "";
898
const char *interface = "eth0";
1351
899
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
900
int sd;
1354
901
uid_t uid;
1355
902
gid_t gid;
903
char *connect_to = NULL;
1356
904
char tempdir[] = "/tmp/mandosXXXXXX";
1357
905
bool tempdir_created = false;
1358
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1362
910
bool gnutls_initialized = false;
1363
911
bool gpgme_initialized = false;
1364
912
float delay = 2.5f;
1365
double retry_interval = 10; /* 10s between trying a server and
1366
retrying the same server again */
1367
913
1368
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
914
struct sigaction old_sigterm_action;
1369
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1370
916
1371
uid = getuid();
1372
gid = getgid();
1373
1374
/* Lower any group privileges we might have, just to be safe */
1375
errno = 0;
1376
ret = setgid(gid);
1377
if(ret == -1){
1378
perror_plus("setgid");
1379
}
1380
1381
/* Lower user privileges (temporarily) */
1382
errno = 0;
1383
ret = seteuid(uid);
1384
if(ret == -1){
1385
perror_plus("seteuid");
1386
}
1387
1388
if(quit_now){
1389
goto end;
1390
}
1391
1392
917
{
1393
918
struct argp_option options[] = {
1394
919
{ .name = "debug", .key = 128,
1423
948
.arg = "SECONDS",
1424
949
.doc = "Maximum delay to wait for interface startup",
1425
950
.group = 2 },
1426
{ .name = "retry", .key = 132,
1427
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
1429
.group = 2 },
1430
/*
1431
* These reproduce what we would get without ARGP_NO_HELP
1432
*/
1433
{ .name = "help", .key = '?',
1434
.doc = "Give this help list", .group = -1 },
1435
{ .name = "usage", .key = -3,
1436
.doc = "Give a short usage message", .group = -1 },
1437
{ .name = "version", .key = 'V',
1438
.doc = "Print program version", .group = -1 },
1439
951
{ .name = NULL }
1440
952
};
1441
953
1442
954
error_t parse_opt(int key, char *arg,
1443
955
struct argp_state *state){
1444
errno = 0;
1445
956
switch(key){
1446
957
case 128: /* --debug */
1447
958
debug = true;
1463
974
tmpmax = strtoimax(arg, &tmp, 10);
1464
975
if(errno != 0 or tmp == arg or *tmp != '\0'
1465
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1466
argp_error(state, "Bad number of DH bits");
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
1467
979
}
1468
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1469
981
break;
1474
986
errno = 0;
1475
987
delay = strtof(arg, &tmp);
1476
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
1477
argp_error(state, "Bad delay");
1478
}
1479
case 132: /* --retry */
1480
errno = 0;
1481
retry_interval = strtod(arg, &tmp);
1482
if(errno != 0 or tmp == arg or *tmp != '\0'
1483
or (retry_interval * 1000) > INT_MAX
1484
or retry_interval < 0){
1485
argp_error(state, "Bad retry interval");
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
1486
991
}
1487
992
break;
1488
/*
1489
* These reproduce what we would get without ARGP_NO_HELP
1490
*/
1491
case '?': /* --help */
1492
argp_state_help(state, state->out_stream,
1493
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1494
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1495
case -3: /* --usage */
1496
argp_state_help(state, state->out_stream,
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
1500
exit(argp_err_exit_status);
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
1501
996
break;
1502
997
default:
1503
998
return ARGP_ERR_UNKNOWN;
1504
999
}
1505
return errno;
1000
return 0;
1506
1001
}
1507
1002
1508
1003
struct argp argp = { .options = options, .parser = parse_opt,
1509
1004
.args_doc = "",
1510
1005
.doc = "Mandos client -- Get and decrypt"
1511
1006
" passwords from a Mandos server" };
1512
ret = argp_parse(&argp, argc, argv,
1513
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1514
switch(ret){
1515
case 0:
1516
break;
1517
case ENOMEM:
1518
default:
1519
errno = ret;
1520
perror_plus("argp_parse");
1521
exitcode = EX_OSERR;
1522
goto end;
1523
case EINVAL:
1524
exitcode = EX_USAGE;
1525
goto end;
1526
}
1527
}
1528
1529
{
1530
/* Work around Debian bug #633582:
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
setenv("DEVICE", interface, 1);
1612
setenv("VERBOSE", debug ? "1" : "0", 1);
1613
setenv("MODE", "start", 1);
1614
/* setenv( XXX more here */
1615
ret = execl(fullname, direntry->d_name, "start", NULL);
1616
perror_plus("execl");
1617
}
1618
free(fullname);
1619
if(quit_now){
1620
goto end;
1621
}
1622
}
1623
close(devnull);
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1012
}
1624
1013
}
1625
1014
1626
1015
if(not debug){
1627
1016
avahi_set_log_function(empty_log);
1628
1017
}
1629
1018
1630
if(interface[0] == '\0'){
1631
struct dirent **direntries;
1632
/* First look for interfaces that are up */
1633
ret = scandir(sys_class_net, &direntries, up_interface,
1634
alphasort);
1635
if(ret == 0){
1636
/* No up interfaces, look for any good interfaces */
1637
free(direntries);
1638
ret = scandir(sys_class_net, &direntries, good_interface,
1639
alphasort);
1640
}
1641
if(ret >= 1){
1642
/* Pick the first interface returned */
1643
interface = strdup(direntries[0]->d_name);
1644
if(debug){
1645
fprintf(stderr, "Using interface \"%s\"\n", interface);
1646
}
1647
if(interface == NULL){
1648
perror_plus("malloc");
1649
free(direntries);
1650
exitcode = EXIT_FAILURE;
1651
goto end;
1652
}
1653
free(direntries);
1654
} else {
1655
free(direntries);
1656
fprintf(stderr, "Could not find a network interface\n");
1657
exitcode = EXIT_FAILURE;
1658
goto end;
1659
}
1660
}
1661
1662
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1663
1020
from the signal handler */
1664
1021
/* Initialize the pseudo-RNG for Avahi */
1666
1023
mc.simple_poll = avahi_simple_poll_new();
1667
1024
if(mc.simple_poll == NULL){
1668
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1669
exitcode = EX_UNAVAILABLE;
1026
exitcode = EXIT_FAILURE;
1670
1027
goto end;
1671
1028
}
1672
1029
1673
1030
sigemptyset(&sigterm_action.sa_mask);
1674
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1675
1032
if(ret == -1){
1676
perror_plus("sigaddset");
1677
exitcode = EX_OSERR;
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1678
1035
goto end;
1679
1036
}
1680
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1681
1038
if(ret == -1){
1682
perror_plus("sigaddset");
1683
exitcode = EX_OSERR;
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1684
1041
goto end;
1685
1042
}
1686
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1687
1044
if(ret == -1){
1688
perror_plus("sigaddset");
1689
exitcode = EX_OSERR;
1690
goto end;
1691
}
1692
/* Need to check if the handler is SIG_IGN before handling:
1693
| [[info:libc:Initial Signal Actions]] |
1694
| [[info:libc:Basic Signal Handling]] |
1695
*/
1696
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1697
if(ret == -1){
1698
perror_plus("sigaction");
1699
return EX_OSERR;
1700
}
1701
if(old_sigterm_action.sa_handler != SIG_IGN){
1702
ret = sigaction(SIGINT, &sigterm_action, NULL);
1703
if(ret == -1){
1704
perror_plus("sigaction");
1705
exitcode = EX_OSERR;
1706
goto end;
1707
}
1708
}
1709
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1710
if(ret == -1){
1711
perror_plus("sigaction");
1712
return EX_OSERR;
1713
}
1714
if(old_sigterm_action.sa_handler != SIG_IGN){
1715
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1716
if(ret == -1){
1717
perror_plus("sigaction");
1718
exitcode = EX_OSERR;
1719
goto end;
1720
}
1721
}
1722
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1723
if(ret == -1){
1724
perror_plus("sigaction");
1725
return EX_OSERR;
1726
}
1727
if(old_sigterm_action.sa_handler != SIG_IGN){
1728
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1729
if(ret == -1){
1730
perror_plus("sigaction");
1731
exitcode = EX_OSERR;
1732
goto end;
1733
}
1734
}
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
1735
1055
1736
1056
/* If the interface is down, bring it up */
1737
if(strcmp(interface, "none") != 0){
1738
if_index = (AvahiIfIndex) if_nametoindex(interface);
1739
if(if_index == 0){
1740
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1741
exitcode = EX_UNAVAILABLE;
1742
goto end;
1743
}
1744
1745
if(quit_now){
1746
goto end;
1747
}
1748
1749
/* Re-raise priviliges */
1750
errno = 0;
1751
ret = seteuid(0);
1752
if(ret == -1){
1753
perror_plus("seteuid");
1754
}
1755
1057
if(interface[0] != '\0'){
1756
1058
#ifdef __linux__
1757
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1060
messages to mess up the prompt */
1759
1061
ret = klogctl(8, NULL, 5);
1760
1062
bool restore_loglevel = true;
1761
1063
if(ret == -1){
1762
1064
restore_loglevel = false;
1763
perror_plus("klogctl");
1065
perror("klogctl");
1764
1066
}
1765
1067
#endif /* __linux__ */
1766
1068
1767
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1768
1070
if(sd < 0){
1769
perror_plus("socket");
1770
exitcode = EX_OSERR;
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1771
1073
#ifdef __linux__
1772
1074
if(restore_loglevel){
1773
1075
ret = klogctl(7, NULL, 0);
1774
1076
if(ret == -1){
1775
perror_plus("klogctl");
1077
perror("klogctl");
1776
1078
}
1777
1079
}
1778
1080
#endif /* __linux__ */
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
1081
goto end;
1786
1082
}
1787
1083
strcpy(network.ifr_name, interface);
1788
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1789
1085
if(ret == -1){
1790
perror_plus("ioctl SIOCGIFFLAGS");
1086
perror("ioctl SIOCGIFFLAGS");
1791
1087
#ifdef __linux__
1792
1088
if(restore_loglevel){
1793
1089
ret = klogctl(7, NULL, 0);
1794
1090
if(ret == -1){
1795
perror_plus("klogctl");
1091
perror("klogctl");
1796
1092
}
1797
1093
}
1798
1094
#endif /* __linux__ */
1799
exitcode = EX_OSERR;
1800
/* Lower privileges */
1801
errno = 0;
1802
ret = seteuid(uid);
1803
if(ret == -1){
1804
perror_plus("seteuid");
1805
}
1095
exitcode = EXIT_FAILURE;
1806
1096
goto end;
1807
1097
}
1808
1098
if((network.ifr_flags & IFF_UP) == 0){
1809
1099
network.ifr_flags |= IFF_UP;
1810
take_down_interface = true;
1811
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1812
1101
if(ret == -1){
1813
take_down_interface = false;
1814
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1815
exitcode = EX_OSERR;
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1816
1104
#ifdef __linux__
1817
1105
if(restore_loglevel){
1818
1106
ret = klogctl(7, NULL, 0);
1819
1107
if(ret == -1){
1820
perror_plus("klogctl");
1108
perror("klogctl");
1821
1109
}
1822
1110
}
1823
1111
#endif /* __linux__ */
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
1112
goto end;
1831
1113
}
1832
1114
}
1833
/* Sleep checking until interface is running.
1834
Check every 0.25s, up to total time of delay */
1115
/* sleep checking until interface is running */
1835
1116
for(int i=0; i < delay * 4; i++){
1836
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1837
1118
if(ret == -1){
1838
perror_plus("ioctl SIOCGIFFLAGS");
1119
perror("ioctl SIOCGIFFLAGS");
1839
1120
} else if(network.ifr_flags & IFF_RUNNING){
1840
1121
break;
1841
1122
}
1842
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1843
1124
ret = nanosleep(&sleeptime, NULL);
1844
1125
if(ret == -1 and errno != EINTR){
1845
perror_plus("nanosleep");
1126
perror("nanosleep");
1846
1127
}
1847
1128
}
1848
if(not take_down_interface){
1849
/* We won't need the socket anymore */
1850
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1851
if(ret == -1){
1852
perror_plus("close");
1853
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
1854
1132
}
1855
1133
#ifdef __linux__
1856
1134
if(restore_loglevel){
1857
1135
/* Restores kernel loglevel to default */
1858
1136
ret = klogctl(7, NULL, 0);
1859
1137
if(ret == -1){
1860
perror_plus("klogctl");
1138
perror("klogctl");
1861
1139
}
1862
1140
}
1863
1141
#endif /* __linux__ */
1864
/* Lower privileges */
1865
errno = 0;
1866
if(take_down_interface){
1867
/* Lower privileges */
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
} else {
1873
/* Lower privileges permanently */
1874
ret = setuid(uid);
1875
if(ret == -1){
1876
perror_plus("setuid");
1877
}
1878
}
1879
}
1880
1881
if(quit_now){
1882
goto end;
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
1883
1156
}
1884
1157
1885
1158
ret = init_gnutls_global(pubkey, seckey);
1886
1159
if(ret == -1){
1887
1160
fprintf(stderr, "init_gnutls_global failed\n");
1888
exitcode = EX_UNAVAILABLE;
1161
exitcode = EXIT_FAILURE;
1889
1162
goto end;
1890
1163
} else {
1891
1164
gnutls_initialized = true;
1892
1165
}
1893
1166
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
1167
if(mkdtemp(tempdir) == NULL){
1899
perror_plus("mkdtemp");
1168
perror("mkdtemp");
1900
1169
goto end;
1901
1170
}
1902
1171
tempdir_created = true;
1903
1172
1904
if(quit_now){
1905
goto end;
1906
}
1907
1908
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
1909
1174
fprintf(stderr, "init_gpgme failed\n");
1910
exitcode = EX_UNAVAILABLE;
1175
exitcode = EXIT_FAILURE;
1911
1176
goto end;
1912
1177
} else {
1913
1178
gpgme_initialized = true;
1914
1179
}
1915
1180
1916
if(quit_now){
1917
goto end;
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1183
if(if_index == 0){
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1918
1188
}
1919
1189
1920
1190
if(connect_to != NULL){
1923
1193
char *address = strrchr(connect_to, ':');
1924
1194
if(address == NULL){
1925
1195
fprintf(stderr, "No colon in address\n");
1926
exitcode = EX_USAGE;
1927
goto end;
1928
}
1929
1930
if(quit_now){
1931
goto end;
1932
}
1933
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1934
1199
uint16_t port;
1935
1200
errno = 0;
1936
1201
tmpmax = strtoimax(address+1, &tmp, 10);
1937
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1938
1203
or tmpmax != (uint16_t)tmpmax){
1939
1204
fprintf(stderr, "Bad port number\n");
1940
exitcode = EX_USAGE;
1941
goto end;
1942
}
1943
1944
if(quit_now){
1945
goto end;
1946
}
1947
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
1948
1208
port = (uint16_t)tmpmax;
1949
1209
*address = '\0';
1210
address = connect_to;
1950
1211
/* Colon in address indicates IPv6 */
1951
1212
int af;
1952
if(strchr(connect_to, ':') != NULL){
1213
if(strchr(address, ':') != NULL){
1953
1214
af = AF_INET6;
1954
/* Accept [] around IPv6 address - see RFC 5952 */
1955
if(connect_to[0] == '[' and address[-1] == ']')
1956
{
1957
connect_to++;
1958
address[-1] = '\0';
1959
}
1960
1215
} else {
1961
1216
af = AF_INET;
1962
1217
}
1963
address = connect_to;
1964
1965
if(quit_now){
1966
goto end;
1967
}
1968
1969
while(not quit_now){
1970
ret = start_mandos_communication(address, port, if_index, af);
1971
if(quit_now or ret == 0){
1972
break;
1973
}
1974
if(debug){
1975
fprintf(stderr, "Retrying in %d seconds\n",
1976
(int)retry_interval);
1977
}
1978
sleep((int)retry_interval);
1979
}
1980
1981
if (not quit_now){
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
1982
1222
exitcode = EXIT_SUCCESS;
1983
1223
}
1224
goto end;
1225
}
1984
1226
1985
goto end;
1986
}
1987
1988
if(quit_now){
1989
goto end;
1990
}
1991
1992
1227
{
1993
1228
AvahiServerConfig config;
1994
1229
/* Do not publish any local Zeroconf records */
2011
1246
if(mc.server == NULL){
2012
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
2013
1248
avahi_strerror(error));
2014
exitcode = EX_UNAVAILABLE;
2015
goto end;
2016
}
2017
2018
if(quit_now){
1249
exitcode = EXIT_FAILURE;
2019
1250
goto end;
2020
1251
}
2021
1252
2026
1257
if(sb == NULL){
2027
1258
fprintf(stderr, "Failed to create service browser: %s\n",
2028
1259
avahi_strerror(avahi_server_errno(mc.server)));
2029
exitcode = EX_UNAVAILABLE;
2030
goto end;
2031
}
2032
2033
if(quit_now){
1260
exitcode = EXIT_FAILURE;
2034
1261
goto end;
2035
1262
}
2036
1263
2039
1266
if(debug){
2040
1267
fprintf(stderr, "Starting Avahi loop search\n");
2041
1268
}
2042
2043
ret = avahi_loop_with_timeout(mc.simple_poll,
2044
(int)(retry_interval * 1000));
2045
if(debug){
2046
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2047
(ret == 0) ? "successfully" : "with error");
2048
}
1269
1270
avahi_simple_poll_loop(mc.simple_poll);
2049
1271
2050
1272
end:
2051
1273
2072
1294
if(gpgme_initialized){
2073
1295
gpgme_release(mc.ctx);
2074
1296
}
2075
2076
/* Cleans up the circular linked list of Mandos servers the client
2077
has seen */
2078
if(mc.current_server != NULL){
2079
mc.current_server->prev->next = NULL;
2080
while(mc.current_server != NULL){
2081
server *next = mc.current_server->next;
2082
free(mc.current_server);
2083
mc.current_server = next;
2084
}
2085
}
2086
2087
/* XXX run network hooks "stop" here */
2088
2089
/* Take down the network interface */
2090
if(take_down_interface){
2091
/* Re-raise priviliges */
2092
errno = 0;
2093
ret = seteuid(0);
2094
if(ret == -1){
2095
perror_plus("seteuid");
2096
}
2097
if(geteuid() == 0){
2098
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2099
if(ret == -1){
2100
perror_plus("ioctl SIOCGIFFLAGS");
2101
} else if(network.ifr_flags & IFF_UP) {
2102
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2104
if(ret == -1){
2105
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2106
}
2107
}
2108
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2109
if(ret == -1){
2110
perror_plus("close");
2111
}
2112
/* Lower privileges permanently */
2113
errno = 0;
2114
ret = setuid(uid);
2115
if(ret == -1){
2116
perror_plus("setuid");
2117
}
2118
}
2119
}
2120
2121
/* Removes the GPGME temp directory and all files inside */
1297
1298
/* Removes the temp directory used by GPGME */
2122
1299
if(tempdir_created){
2123
struct dirent **direntries = NULL;
2124
struct dirent *direntry = NULL;
2125
int numentries = scandir(tempdir, &direntries, notdotentries,
2126
alphasort);
2127
if (numentries > 0){
2128
for(int i = 0; i < numentries; i++){
2129
direntry = direntries[i];
1300
DIR *d;
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1303
if(d == NULL){
1304
if(errno != ENOENT){
1305
perror("opendir");
1306
}
1307
} else {
1308
while(true){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1311
break;
1312
}
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
continue;
1319
}
2130
1320
char *fullname = NULL;
2131
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
2132
1322
direntry->d_name);
2133
1323
if(ret < 0){
2134
perror_plus("asprintf");
1324
perror("asprintf");
2135
1325
continue;
2136
1326
}
2137
1327
ret = remove(fullname);
2141
1331
}
2142
1332
free(fullname);
2143
1333
}
2144
}
2145
2146
/* need to clean even if 0 because man page doesn't specify */
2147
free(direntries);
2148
if (numentries == -1){
2149
perror_plus("scandir");
1334
closedir(d);
2150
1335
}
2151
1336
ret = rmdir(tempdir);
2152
1337
if(ret == -1 and errno != ENOENT){
2153
perror_plus("rmdir");
2154
}
2155
}
2156
2157
if(quit_now){
2158
sigemptyset(&old_sigterm_action.sa_mask);
2159
old_sigterm_action.sa_handler = SIG_DFL;
2160
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2161
&old_sigterm_action,
2162
NULL));
2163
if(ret == -1){
2164
perror_plus("sigaction");
2165
}
2166
do {
2167
ret = raise(signal_received);
2168
} while(ret != 0 and errno == EINTR);
2169
if(ret != 0){
2170
perror_plus("raise");
2171
abort();
2172
}
2173
TEMP_FAILURE_RETRY(pause());
1338
perror("rmdir");
1339
}
2174
1340
}
2175
1341
2176
1342
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0