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- Committer: Teddy Hogeborn
- Date: 2011-11-11 09:10:58 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111111091058-60y74fpjy2ce1c17
Intermediate commit - this does *not* work yet.
* plugins.d/mandos-client.c (HOOKDIR): New.
(up_interface): New.
(runnable_hook): New.
(main): Run network hooks with "start" argument.
* plugins.d/mandos-client.c (HOOKDIR): New.
(up_interface): New.
(runnable_hook): New.
(main): Run network hooks with "start" argument.
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
71
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
80
81
argp_parse(), ARGP_KEY_ARG,
81
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
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 */
85
88
86
89
#ifdef __linux__
87
90
#include <sys/klog.h> /* klogctl() */
120
123
#define PATHDIR "/conf/conf.d/mandos"
121
124
#define SECKEY "seckey.txt"
122
125
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
127
124
128
bool debug = false;
125
129
static const char mandos_protocol_version[] = "1";
126
130
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
128
145
129
146
/* Used for passing in values through the Avahi callback functions */
130
147
typedef struct {
135
152
gnutls_dh_params_t dh_params;
136
153
const char *priority;
137
154
gpgme_ctx_t ctx;
155
server *current_server;
138
156
} mandos_context;
139
157
140
158
/* global context so signal handler can reach it*/
141
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
160
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
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
}
144
173
145
174
/*
146
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
159
188
return buffer_capacity;
160
189
}
161
190
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
162
229
/*
163
230
* Initialize GPGME.
164
231
*/
165
232
static bool init_gpgme(const char *seckey,
166
233
const char *pubkey, const char *tempdir){
167
int ret;
168
234
gpgme_error_t rc;
169
235
gpgme_engine_info_t engine_info;
170
236
173
239
* Helper function to insert pub and seckey to the engine keyring.
174
240
*/
175
241
bool import_key(const char *filename){
242
int ret;
176
243
int fd;
177
244
gpgme_data_t pgp_data;
178
245
179
246
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
247
if(fd == -1){
181
perror("open");
248
perror_plus("open");
182
249
return false;
183
250
}
184
251
198
265
199
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
267
if(ret == -1){
201
perror("close");
268
perror_plus("close");
202
269
}
203
270
gpgme_data_release(pgp_data);
204
271
return true;
217
284
return false;
218
285
}
219
286
220
/* Set GPGME home directory for the OpenPGP engine only */
287
/* Set GPGME home directory for the OpenPGP engine only */
221
288
rc = gpgme_get_engine_info(&engine_info);
222
289
if(rc != GPG_ERR_NO_ERROR){
223
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
249
316
return false;
250
317
}
251
318
252
return true;
319
return true;
253
320
}
254
321
255
322
/*
309
376
}
310
377
gpgme_recipient_t recipient;
311
378
recipient = result->recipients;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
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;
322
387
}
323
388
}
324
389
}
331
396
332
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
398
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
399
perror_plus("gpgme_data_seek");
335
400
plaintext_length = -1;
336
401
goto decrypt_end;
337
402
}
342
407
(size_t)plaintext_length,
343
408
plaintext_capacity);
344
409
if(plaintext_capacity == 0){
345
perror("incbuffer");
410
perror_plus("incbuffer");
346
411
plaintext_length = -1;
347
412
goto decrypt_end;
348
413
}
355
420
break;
356
421
}
357
422
if(ret < 0){
358
perror("gpgme_data_read");
423
perror_plus("gpgme_data_read");
359
424
plaintext_length = -1;
360
425
goto decrypt_end;
361
426
}
418
483
}
419
484
420
485
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
422
487
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
488
fprintf(stderr, "GnuTLS memory error: %s\n",
427
489
safer_gnutls_strerror(ret));
428
490
gnutls_global_deinit();
429
491
return -1;
476
538
static int init_gnutls_session(gnutls_session_t *session){
477
539
int ret;
478
540
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
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);
480
547
if(ret != GNUTLS_E_SUCCESS){
481
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
549
safer_gnutls_strerror(ret));
484
551
485
552
{
486
553
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &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);
488
561
if(ret != GNUTLS_E_SUCCESS){
489
562
fprintf(stderr, "Syntax error at: %s\n", err);
490
563
fprintf(stderr, "GnuTLS error: %s\n",
494
567
}
495
568
}
496
569
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
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);
499
578
if(ret != GNUTLS_E_SUCCESS){
500
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
580
safer_gnutls_strerror(ret));
504
583
}
505
584
506
585
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
509
587
510
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
511
589
520
598
static int start_mandos_communication(const char *ip, uint16_t port,
521
599
AvahiIfIndex if_index,
522
600
int af){
523
int ret, tcp_sd;
601
int ret, tcp_sd = -1;
524
602
ssize_t sret;
525
603
union {
526
604
struct sockaddr_in in;
527
605
struct sockaddr_in6 in6;
528
606
} to;
529
607
char *buffer = NULL;
530
char *decrypted_buffer;
608
char *decrypted_buffer = NULL;
531
609
size_t buffer_length = 0;
532
610
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
611
size_t written;
535
int retval = 0;
612
int retval = -1;
536
613
gnutls_session_t session;
537
614
int pf; /* Protocol family */
538
615
616
errno = 0;
617
618
if(quit_now){
619
errno = EINTR;
620
return -1;
621
}
622
539
623
switch(af){
540
624
case AF_INET6:
541
625
pf = PF_INET6;
545
629
break;
546
630
default:
547
631
fprintf(stderr, "Bad address family: %d\n", af);
632
errno = EINVAL;
548
633
return -1;
549
634
}
550
635
560
645
561
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
647
if(tcp_sd < 0){
563
perror("socket");
564
return -1;
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;
565
657
}
566
658
567
659
memset(&to, 0, sizeof(to));
573
665
ret = inet_pton(af, ip, &to.in.sin_addr);
574
666
}
575
667
if(ret < 0 ){
576
perror("inet_pton");
577
return -1;
668
int e = errno;
669
perror_plus("inet_pton");
670
errno = e;
671
goto mandos_end;
578
672
}
579
673
if(ret == 0){
674
int e = errno;
580
675
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
676
errno = e;
677
goto mandos_end;
582
678
}
583
679
if(af == AF_INET6){
584
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
591
687
if(if_index == AVAHI_IF_UNSPEC){
592
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
689
" without a network interface\n");
594
return -1;
690
errno = EINVAL;
691
goto mandos_end;
595
692
}
596
693
/* Set the network interface number as scope */
597
694
to.in6.sin6_scope_id = (uint32_t)if_index;
602
699
-Wunreachable-code */
603
700
}
604
701
702
if(quit_now){
703
errno = EINTR;
704
goto mandos_end;
705
}
706
605
707
if(debug){
606
708
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
709
char interface[IF_NAMESIZE];
608
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
711
perror_plus("if_indextoname");
610
712
} else {
611
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
714
ip, interface, port);
626
728
sizeof(addrstr));
627
729
}
628
730
if(pcret == NULL){
629
perror("inet_ntop");
731
perror_plus("inet_ntop");
630
732
} else {
631
733
if(strcmp(addrstr, ip) != 0){
632
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
634
736
}
635
737
}
636
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
637
744
if(af == AF_INET6){
638
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
746
} else {
640
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
748
}
642
749
if(ret < 0){
643
perror("connect");
644
return -1;
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;
645
761
}
646
762
647
763
const char *out = mandos_protocol_version;
651
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
768
out_size - written));
653
769
if(ret == -1){
654
perror("write");
655
retval = -1;
770
int e = errno;
771
perror_plus("write");
772
errno = e;
656
773
goto mandos_end;
657
774
}
658
775
written += (size_t)ret;
666
783
break;
667
784
}
668
785
}
786
787
if(quit_now){
788
errno = EINTR;
789
goto mandos_end;
790
}
669
791
}
670
792
671
793
if(debug){
672
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
795
}
674
796
797
if(quit_now){
798
errno = EINTR;
799
goto mandos_end;
800
}
801
802
/* Spurious warning from -Wint-to-pointer-cast */
675
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
804
677
do{
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
do {
678
811
ret = gnutls_handshake(session);
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
679
816
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
817
681
818
if(ret != GNUTLS_E_SUCCESS){
683
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
684
821
gnutls_perror(ret);
685
822
}
686
retval = -1;
823
errno = EPROTO;
687
824
goto mandos_end;
688
825
}
689
826
695
832
}
696
833
697
834
while(true){
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
698
841
buffer_capacity = incbuffer(&buffer, buffer_length,
699
842
buffer_capacity);
700
843
if(buffer_capacity == 0){
701
perror("incbuffer");
702
retval = -1;
844
int e = errno;
845
perror_plus("incbuffer");
846
errno = e;
847
goto mandos_end;
848
}
849
850
if(quit_now){
851
errno = EINTR;
703
852
goto mandos_end;
704
853
}
705
854
714
863
case GNUTLS_E_AGAIN:
715
864
break;
716
865
case GNUTLS_E_REHANDSHAKE:
717
do{
866
do {
718
867
ret = gnutls_handshake(session);
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
719
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
874
if(ret < 0){
721
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
722
876
gnutls_perror(ret);
723
retval = -1;
877
errno = EPROTO;
724
878
goto mandos_end;
725
879
}
726
880
break;
727
881
default:
728
882
fprintf(stderr, "Unknown error while reading data from"
729
883
" encrypted session with Mandos server\n");
730
retval = -1;
731
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
errno = EIO;
732
886
goto mandos_end;
733
887
}
734
888
} else {
740
894
fprintf(stderr, "Closing TLS session\n");
741
895
}
742
896
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
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);
744
909
745
910
if(buffer_length > 0){
911
ssize_t decrypted_buffer_size;
746
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
913
buffer_length,
748
914
&decrypted_buffer);
749
915
if(decrypted_buffer_size >= 0){
916
750
917
written = 0;
751
918
while(written < (size_t) decrypted_buffer_size){
919
if(quit_now){
920
errno = EINTR;
921
goto mandos_end;
922
}
923
752
924
ret = (int)fwrite(decrypted_buffer + written, 1,
753
925
(size_t)decrypted_buffer_size - written,
754
926
stdout);
755
927
if(ret == 0 and ferror(stdout)){
928
int e = errno;
756
929
if(debug){
757
930
fprintf(stderr, "Error writing encrypted data: %s\n",
758
931
strerror(errno));
759
932
}
760
retval = -1;
761
break;
933
errno = e;
934
goto mandos_end;
762
935
}
763
936
written += (size_t)ret;
764
937
}
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
938
retval = 0;
768
939
}
769
} else {
770
retval = -1;
771
940
}
772
941
773
942
/* Shutdown procedure */
774
943
775
944
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
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
}
780
964
}
781
gnutls_deinit(session);
782
965
return retval;
783
966
}
784
967
801
984
/* Called whenever a service has been resolved successfully or
802
985
timed out */
803
986
987
if(quit_now){
988
return;
989
}
990
804
991
switch(event){
805
992
default:
806
993
case AVAHI_RESOLVER_FAILURE:
822
1009
avahi_proto_to_af(proto));
823
1010
if(ret == 0){
824
1011
avahi_simple_poll_quit(mc.simple_poll);
1012
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
825
1015
}
826
1016
}
827
1017
}
843
1033
/* Called whenever a new services becomes available on the LAN or
844
1034
is removed from the LAN */
845
1035
1036
if(quit_now){
1037
return;
1038
}
1039
846
1040
switch(event){
847
1041
default:
848
1042
case AVAHI_BROWSER_FAILURE:
877
1071
}
878
1072
}
879
1073
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1074
/* Signal handler that stops main loop after SIGTERM */
1075
static void handle_sigterm(int sig){
884
1076
if(quit_now){
885
1077
return;
886
1078
}
887
1079
quit_now = 1;
1080
signal_received = sig;
888
1081
int old_errno = errno;
1082
/* set main loop to exit */
889
1083
if(mc.simple_poll != NULL){
890
1084
avahi_simple_poll_quit(mc.simple_poll);
891
1085
}
892
1086
errno = old_errno;
893
1087
}
894
1088
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
int ret;
1156
if(if_entry->d_name[0] == '.'){
1157
return 0;
1158
}
1159
struct ifreq ifr;
1160
1161
if(not get_flags(if_entry->d_name, &ifr)){
1162
return 0;
1163
}
1164
1165
if(not good_flags(if_entry->d_name, &ifr)){
1166
return 0;
1167
}
1168
return 1;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int up_interface(const struct dirent *if_entry){
1177
ssize_t ssret;
1178
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1180
return 0;
1181
}
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1183
if_entry->d_name);
1184
if(ret < 0){
1185
perror_plus("asprintf");
1186
return 0;
1187
}
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1189
if(flags_fd == -1){
1190
perror_plus("open");
1191
free(flagname);
1192
return 0;
1193
}
1194
free(flagname);
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1202
close(flags_fd);
1203
return 0;
1204
}
1205
while(to_read > 0){
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1207
(size_t)to_read));
1208
if(ssret == -1){
1209
perror_plus("read");
1210
free(flagstring);
1211
close(flags_fd);
1212
return 0;
1213
}
1214
to_read -= ssret;
1215
if(ssret == 0){
1216
break;
1217
}
1218
}
1219
close(flags_fd);
1220
intmax_t tmpmax;
1221
char *tmp;
1222
errno = 0;
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1227
if(debug){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1230
}
1231
free(flagstring);
1232
return 0;
1233
}
1234
free(flagstring);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1238
if(debug){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1247
return 0;
1248
}
1249
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1252
if(debug){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1254
if_entry->d_name);
1255
}
1256
return 1;
1257
}
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1260
if(debug){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 0;
1265
}
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Accept this device */
1275
if(debug){
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1277
if_entry->d_name);
1278
}
1279
return 1;
1280
}
1281
1282
int notdotentries(const struct dirent *direntry){
1283
/* Skip "." and ".." */
1284
if(direntry->d_name[0] == '.'
1285
and (direntry->d_name[1] == '\0'
1286
or (direntry->d_name[1] == '.'
1287
and direntry->d_name[2] == '\0'))){
1288
return 0;
1289
}
1290
return 1;
1291
}
1292
1293
/* Is this directory entry a runnable program? */
1294
int runnable_hook(const struct dirent *direntry){
1295
int ret;
1296
struct stat st;
1297
1298
if((direntry->d_name)[0] == '\0'){
1299
/* Empty name? */
1300
return 0;
1301
}
1302
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1305
1306
if(*end == '~'){
1307
/* Backup name~ */
1308
return 0;
1309
}
1310
1311
if(((direntry->d_name)[0] == '#')
1312
and (*end == '#')){
1313
/* Temporary #name# */
1314
return 0;
1315
}
1316
1317
/* XXX more rules here */
1318
1319
ret = stat(direntry->d_name, &st);
1320
if(ret == -1){
1321
if(debug){
1322
perror_plus("Could not stat plugin");
1323
}
1324
return 0;
1325
}
1326
if(not (st.st_mode & S_ISREG)){
1327
/* Not a regular file */
1328
return 0;
1329
}
1330
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1331
/* Not executable */
1332
return 0;
1333
}
1334
return 1;
1335
}
1336
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1338
int ret;
1339
struct timespec now;
1340
struct timespec waited_time;
1341
intmax_t block_time;
1342
1343
while(true){
1344
if(mc.current_server == NULL){
1345
if (debug){
1346
fprintf(stderr,
1347
"Wait until first server is found. No timeout!\n");
1348
}
1349
ret = avahi_simple_poll_iterate(s, -1);
1350
} else {
1351
if (debug){
1352
fprintf(stderr, "Check current_server if we should run it,"
1353
" or wait\n");
1354
}
1355
/* the current time */
1356
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1357
if(ret == -1){
1358
perror_plus("clock_gettime");
1359
return -1;
1360
}
1361
/* Calculating in ms how long time between now and server
1362
who we visted longest time ago. Now - last seen. */
1363
waited_time.tv_sec = (now.tv_sec
1364
- mc.current_server->last_seen.tv_sec);
1365
waited_time.tv_nsec = (now.tv_nsec
1366
- mc.current_server->last_seen.tv_nsec);
1367
/* total time is 10s/10,000ms.
1368
Converting to s from ms by dividing by 1,000,
1369
and ns to ms by dividing by 1,000,000. */
1370
block_time = ((retry_interval
1371
- ((intmax_t)waited_time.tv_sec * 1000))
1372
- ((intmax_t)waited_time.tv_nsec / 1000000));
1373
1374
if (debug){
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1376
}
1377
1378
if(block_time <= 0){
1379
ret = start_mandos_communication(mc.current_server->ip,
1380
mc.current_server->port,
1381
mc.current_server->if_index,
1382
mc.current_server->af);
1383
if(ret == 0){
1384
avahi_simple_poll_quit(mc.simple_poll);
1385
return 0;
1386
}
1387
ret = clock_gettime(CLOCK_MONOTONIC,
1388
&mc.current_server->last_seen);
1389
if(ret == -1){
1390
perror_plus("clock_gettime");
1391
return -1;
1392
}
1393
mc.current_server = mc.current_server->next;
1394
block_time = 0; /* Call avahi to find new Mandos
1395
servers, but don't block */
1396
}
1397
1398
ret = avahi_simple_poll_iterate(s, (int)block_time);
1399
}
1400
if(ret != 0){
1401
if (ret > 0 or errno != EINTR) {
1402
return (ret != 1) ? ret : 0;
1403
}
1404
}
1405
}
1406
}
1407
895
1408
int main(int argc, char *argv[]){
896
1409
AvahiSServiceBrowser *sb = NULL;
897
1410
int error;
899
1412
intmax_t tmpmax;
900
1413
char *tmp;
901
1414
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
1415
const char *interface = "";
903
1416
struct ifreq network;
904
int sd;
1417
int sd = -1;
1418
bool take_down_interface = false;
905
1419
uid_t uid;
906
1420
gid_t gid;
907
char *connect_to = NULL;
908
1421
char tempdir[] = "/tmp/mandosXXXXXX";
909
1422
bool tempdir_created = false;
910
1423
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
914
1427
bool gnutls_initialized = false;
915
1428
bool gpgme_initialized = false;
916
1429
float delay = 2.5f;
1430
double retry_interval = 10; /* 10s between trying a server and
1431
retrying the same server again */
917
1432
918
struct sigaction old_sigterm_action;
1433
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
1434
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
1435
1436
uid = getuid();
1437
gid = getgid();
1438
1439
/* Lower any group privileges we might have, just to be safe */
1440
errno = 0;
1441
ret = setgid(gid);
1442
if(ret == -1){
1443
perror_plus("setgid");
1444
}
1445
1446
/* Lower user privileges (temporarily) */
1447
errno = 0;
1448
ret = seteuid(uid);
1449
if(ret == -1){
1450
perror_plus("seteuid");
1451
}
1452
1453
if(quit_now){
1454
goto end;
1455
}
1456
921
1457
{
922
1458
struct argp_option options[] = {
923
1459
{ .name = "debug", .key = 128,
952
1488
.arg = "SECONDS",
953
1489
.doc = "Maximum delay to wait for interface startup",
954
1490
.group = 2 },
1491
{ .name = "retry", .key = 132,
1492
.arg = "SECONDS",
1493
.doc = "Retry interval used when denied by the mandos server",
1494
.group = 2 },
1495
/*
1496
* These reproduce what we would get without ARGP_NO_HELP
1497
*/
1498
{ .name = "help", .key = '?',
1499
.doc = "Give this help list", .group = -1 },
1500
{ .name = "usage", .key = -3,
1501
.doc = "Give a short usage message", .group = -1 },
1502
{ .name = "version", .key = 'V',
1503
.doc = "Print program version", .group = -1 },
955
1504
{ .name = NULL }
956
1505
};
957
1506
958
1507
error_t parse_opt(int key, char *arg,
959
1508
struct argp_state *state){
1509
errno = 0;
960
1510
switch(key){
961
1511
case 128: /* --debug */
962
1512
debug = true;
978
1528
tmpmax = strtoimax(arg, &tmp, 10);
979
1529
if(errno != 0 or tmp == arg or *tmp != '\0'
980
1530
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1531
argp_error(state, "Bad number of DH bits");
983
1532
}
984
1533
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
1534
break;
990
1539
errno = 0;
991
1540
delay = strtof(arg, &tmp);
992
1541
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
1542
argp_error(state, "Bad delay");
1543
}
1544
case 132: /* --retry */
1545
errno = 0;
1546
retry_interval = strtod(arg, &tmp);
1547
if(errno != 0 or tmp == arg or *tmp != '\0'
1548
or (retry_interval * 1000) > INT_MAX
1549
or retry_interval < 0){
1550
argp_error(state, "Bad retry interval");
995
1551
}
996
1552
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1553
/*
1554
* These reproduce what we would get without ARGP_NO_HELP
1555
*/
1556
case '?': /* --help */
1557
argp_state_help(state, state->out_stream,
1558
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1559
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1560
case -3: /* --usage */
1561
argp_state_help(state, state->out_stream,
1562
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1563
case 'V': /* --version */
1564
fprintf(state->out_stream, "%s\n", argp_program_version);
1565
exit(argp_err_exit_status);
1000
1566
break;
1001
1567
default:
1002
1568
return ARGP_ERR_UNKNOWN;
1003
1569
}
1004
return 0;
1570
return errno;
1005
1571
}
1006
1572
1007
1573
struct argp argp = { .options = options, .parser = parse_opt,
1008
1574
.args_doc = "",
1009
1575
.doc = "Mandos client -- Get and decrypt"
1010
1576
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1577
ret = argp_parse(&argp, argc, argv,
1578
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1579
switch(ret){
1580
case 0:
1581
break;
1582
case ENOMEM:
1583
default:
1584
errno = ret;
1585
perror_plus("argp_parse");
1586
exitcode = EX_OSERR;
1587
goto end;
1588
case EINVAL:
1589
exitcode = EX_USAGE;
1590
goto end;
1591
}
1592
}
1593
1594
{
1595
/* Work around Debian bug #633582:
1596
<http://bugs.debian.org/633582> */
1597
struct stat st;
1598
1599
/* Re-raise priviliges */
1600
errno = 0;
1601
ret = seteuid(0);
1602
if(ret == -1){
1603
perror_plus("seteuid");
1604
}
1605
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1610
} else {
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1612
if(ret == -1){
1613
perror_plus("fstat");
1614
} else {
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1617
if(ret == -1){
1618
perror_plus("fchown");
1619
}
1620
}
1621
}
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1623
}
1624
}
1625
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1630
} else {
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1632
if(ret == -1){
1633
perror_plus("fstat");
1634
} else {
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1637
if(ret == -1){
1638
perror_plus("fchown");
1639
}
1640
}
1641
}
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1643
}
1644
}
1645
1646
/* Lower privileges */
1647
errno = 0;
1648
ret = seteuid(uid);
1649
if(ret == -1){
1650
perror_plus("seteuid");
1651
}
1652
}
1653
1654
/* Find network hooks and run them */
1655
{
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1659
alphasort);
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1665
direntry->d_name);
1666
if(ret < 0){
1667
perror_plus("asprintf");
1668
continue;
1669
}
1670
pid_t hook_pid = fork();
1671
if(hook_pid == 0){
1672
/* Child */
1673
dup2(devnull, STDIN_FILENO);
1674
close(devnull);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1682
}
1683
free(fullname);
1684
if(quit_now){
1685
goto end;
1686
}
1687
}
1688
close(devnull);
1017
1689
}
1018
1690
1019
1691
if(not debug){
1020
1692
avahi_set_log_function(empty_log);
1021
1693
}
1022
1694
1695
if(interface[0] == '\0'){
1696
struct dirent **direntries;
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1698
alphasort);
1699
if(ret >= 1){
1700
/* Pick the first good interface */
1701
interface = strdup(direntries[0]->d_name);
1702
if(debug){
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1704
}
1705
if(interface == NULL){
1706
perror_plus("malloc");
1707
free(direntries);
1708
exitcode = EXIT_FAILURE;
1709
goto end;
1710
}
1711
free(direntries);
1712
} else {
1713
free(direntries);
1714
fprintf(stderr, "Could not find a network interface\n");
1715
exitcode = EXIT_FAILURE;
1716
goto end;
1717
}
1718
}
1719
1023
1720
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1024
1721
from the signal handler */
1025
1722
/* Initialize the pseudo-RNG for Avahi */
1027
1724
mc.simple_poll = avahi_simple_poll_new();
1028
1725
if(mc.simple_poll == NULL){
1029
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1727
exitcode = EX_UNAVAILABLE;
1031
1728
goto end;
1032
1729
}
1033
1730
1034
1731
sigemptyset(&sigterm_action.sa_mask);
1035
1732
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
1733
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1734
perror_plus("sigaddset");
1735
exitcode = EX_OSERR;
1039
1736
goto end;
1040
1737
}
1041
1738
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
1739
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1740
perror_plus("sigaddset");
1741
exitcode = EX_OSERR;
1045
1742
goto end;
1046
1743
}
1047
1744
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
1745
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1746
perror_plus("sigaddset");
1747
exitcode = EX_OSERR;
1748
goto end;
1749
}
1750
/* Need to check if the handler is SIG_IGN before handling:
1751
| [[info:libc:Initial Signal Actions]] |
1752
| [[info:libc:Basic Signal Handling]] |
1753
*/
1754
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1755
if(ret == -1){
1756
perror_plus("sigaction");
1757
return EX_OSERR;
1758
}
1759
if(old_sigterm_action.sa_handler != SIG_IGN){
1760
ret = sigaction(SIGINT, &sigterm_action, NULL);
1761
if(ret == -1){
1762
perror_plus("sigaction");
1763
exitcode = EX_OSERR;
1764
goto end;
1765
}
1766
}
1767
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1768
if(ret == -1){
1769
perror_plus("sigaction");
1770
return EX_OSERR;
1771
}
1772
if(old_sigterm_action.sa_handler != SIG_IGN){
1773
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1774
if(ret == -1){
1775
perror_plus("sigaction");
1776
exitcode = EX_OSERR;
1777
goto end;
1778
}
1779
}
1780
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1781
if(ret == -1){
1782
perror_plus("sigaction");
1783
return EX_OSERR;
1784
}
1785
if(old_sigterm_action.sa_handler != SIG_IGN){
1786
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1787
if(ret == -1){
1788
perror_plus("sigaction");
1789
exitcode = EX_OSERR;
1790
goto end;
1791
}
1792
}
1059
1793
1060
1794
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1795
if(strcmp(interface, "none") != 0){
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1799
exitcode = EX_UNAVAILABLE;
1800
goto end;
1801
}
1802
1803
if(quit_now){
1804
goto end;
1805
}
1806
1807
/* Re-raise priviliges */
1808
errno = 0;
1809
ret = seteuid(0);
1810
if(ret == -1){
1811
perror_plus("seteuid");
1812
}
1813
1062
1814
#ifdef __linux__
1063
1815
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1816
messages about the network interface to mess up the prompt */
1065
1817
ret = klogctl(8, NULL, 5);
1066
1818
bool restore_loglevel = true;
1067
1819
if(ret == -1){
1068
1820
restore_loglevel = false;
1069
perror("klogctl");
1821
perror_plus("klogctl");
1070
1822
}
1071
1823
#endif /* __linux__ */
1072
1824
1073
1825
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
1826
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1827
perror_plus("socket");
1828
exitcode = EX_OSERR;
1077
1829
#ifdef __linux__
1078
1830
if(restore_loglevel){
1079
1831
ret = klogctl(7, NULL, 0);
1080
1832
if(ret == -1){
1081
perror("klogctl");
1833
perror_plus("klogctl");
1082
1834
}
1083
1835
}
1084
1836
#endif /* __linux__ */
1837
/* Lower privileges */
1838
errno = 0;
1839
ret = seteuid(uid);
1840
if(ret == -1){
1841
perror_plus("seteuid");
1842
}
1085
1843
goto end;
1086
1844
}
1087
1845
strcpy(network.ifr_name, interface);
1088
1846
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
1847
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1848
perror_plus("ioctl SIOCGIFFLAGS");
1091
1849
#ifdef __linux__
1092
1850
if(restore_loglevel){
1093
1851
ret = klogctl(7, NULL, 0);
1094
1852
if(ret == -1){
1095
perror("klogctl");
1853
perror_plus("klogctl");
1096
1854
}
1097
1855
}
1098
1856
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1857
exitcode = EX_OSERR;
1858
/* Lower privileges */
1859
errno = 0;
1860
ret = seteuid(uid);
1861
if(ret == -1){
1862
perror_plus("seteuid");
1863
}
1100
1864
goto end;
1101
1865
}
1102
1866
if((network.ifr_flags & IFF_UP) == 0){
1103
1867
network.ifr_flags |= IFF_UP;
1868
take_down_interface = true;
1104
1869
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
1870
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1871
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1873
exitcode = EX_OSERR;
1108
1874
#ifdef __linux__
1109
1875
if(restore_loglevel){
1110
1876
ret = klogctl(7, NULL, 0);
1111
1877
if(ret == -1){
1112
perror("klogctl");
1878
perror_plus("klogctl");
1113
1879
}
1114
1880
}
1115
1881
#endif /* __linux__ */
1882
/* Lower privileges */
1883
errno = 0;
1884
ret = seteuid(uid);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1116
1888
goto end;
1117
1889
}
1118
1890
}
1119
/* sleep checking until interface is running */
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1120
1893
for(int i=0; i < delay * 4; i++){
1121
1894
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
1895
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1896
perror_plus("ioctl SIOCGIFFLAGS");
1124
1897
} else if(network.ifr_flags & IFF_RUNNING){
1125
1898
break;
1126
1899
}
1127
1900
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
1901
ret = nanosleep(&sleeptime, NULL);
1129
1902
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1903
perror_plus("nanosleep");
1131
1904
}
1132
1905
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1906
if(not take_down_interface){
1907
/* We won't need the socket anymore */
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1136
1912
}
1137
1913
#ifdef __linux__
1138
1914
if(restore_loglevel){
1139
1915
/* Restores kernel loglevel to default */
1140
1916
ret = klogctl(7, NULL, 0);
1141
1917
if(ret == -1){
1142
perror("klogctl");
1918
perror_plus("klogctl");
1143
1919
}
1144
1920
}
1145
1921
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1922
/* Lower privileges */
1923
errno = 0;
1924
if(take_down_interface){
1925
/* Lower privileges */
1926
ret = seteuid(uid);
1927
if(ret == -1){
1928
perror_plus("seteuid");
1929
}
1930
} else {
1931
/* Lower privileges permanently */
1932
ret = setuid(uid);
1933
if(ret == -1){
1934
perror_plus("setuid");
1935
}
1936
}
1937
}
1938
1939
if(quit_now){
1940
goto end;
1160
1941
}
1161
1942
1162
1943
ret = init_gnutls_global(pubkey, seckey);
1163
1944
if(ret == -1){
1164
1945
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
1946
exitcode = EX_UNAVAILABLE;
1166
1947
goto end;
1167
1948
} else {
1168
1949
gnutls_initialized = true;
1169
1950
}
1170
1951
1952
if(quit_now){
1953
goto end;
1954
}
1955
1171
1956
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1957
perror_plus("mkdtemp");
1173
1958
goto end;
1174
1959
}
1175
1960
tempdir_created = true;
1176
1961
1962
if(quit_now){
1963
goto end;
1964
}
1965
1177
1966
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
1967
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
1968
exitcode = EX_UNAVAILABLE;
1180
1969
goto end;
1181
1970
} else {
1182
1971
gpgme_initialized = true;
1183
1972
}
1184
1973
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
1974
if(quit_now){
1975
goto end;
1192
1976
}
1193
1977
1194
1978
if(connect_to != NULL){
1197
1981
char *address = strrchr(connect_to, ':');
1198
1982
if(address == NULL){
1199
1983
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1984
exitcode = EX_USAGE;
1985
goto end;
1986
}
1987
1988
if(quit_now){
1989
goto end;
1990
}
1991
1203
1992
uint16_t port;
1204
1993
errno = 0;
1205
1994
tmpmax = strtoimax(address+1, &tmp, 10);
1206
1995
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
1996
or tmpmax != (uint16_t)tmpmax){
1208
1997
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1998
exitcode = EX_USAGE;
1999
goto end;
2000
}
2001
2002
if(quit_now){
2003
goto end;
2004
}
2005
1212
2006
port = (uint16_t)tmpmax;
1213
2007
*address = '\0';
1214
address = connect_to;
1215
2008
/* Colon in address indicates IPv6 */
1216
2009
int af;
1217
if(strchr(address, ':') != NULL){
2010
if(strchr(connect_to, ':') != NULL){
1218
2011
af = AF_INET6;
2012
/* Accept [] around IPv6 address - see RFC 5952 */
2013
if(connect_to[0] == '[' and address[-1] == ']')
2014
{
2015
connect_to++;
2016
address[-1] = '\0';
2017
}
1219
2018
} else {
1220
2019
af = AF_INET;
1221
2020
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2021
address = connect_to;
2022
2023
if(quit_now){
2024
goto end;
2025
}
2026
2027
while(not quit_now){
2028
ret = start_mandos_communication(address, port, if_index, af);
2029
if(quit_now or ret == 0){
2030
break;
2031
}
2032
if(debug){
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
2035
}
2036
sleep((int)retry_interval);
2037
}
2038
2039
if (not quit_now){
1226
2040
exitcode = EXIT_SUCCESS;
1227
2041
}
1228
goto end;
1229
}
1230
2042
2043
goto end;
2044
}
2045
2046
if(quit_now){
2047
goto end;
2048
}
2049
1231
2050
{
1232
2051
AvahiServerConfig config;
1233
2052
/* Do not publish any local Zeroconf records */
1250
2069
if(mc.server == NULL){
1251
2070
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
2071
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2072
exitcode = EX_UNAVAILABLE;
2073
goto end;
2074
}
2075
2076
if(quit_now){
1254
2077
goto end;
1255
2078
}
1256
2079
1261
2084
if(sb == NULL){
1262
2085
fprintf(stderr, "Failed to create service browser: %s\n",
1263
2086
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2087
exitcode = EX_UNAVAILABLE;
2088
goto end;
2089
}
2090
2091
if(quit_now){
1265
2092
goto end;
1266
2093
}
1267
2094
1270
2097
if(debug){
1271
2098
fprintf(stderr, "Starting Avahi loop search\n");
1272
2099
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2100
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
2103
if(debug){
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
2106
}
1275
2107
1276
2108
end:
1277
2109
1298
2130
if(gpgme_initialized){
1299
2131
gpgme_release(mc.ctx);
1300
2132
}
1301
1302
/* Removes the temp directory used by GPGME */
2133
2134
/* Cleans up the circular linked list of Mandos servers the client
2135
has seen */
2136
if(mc.current_server != NULL){
2137
mc.current_server->prev->next = NULL;
2138
while(mc.current_server != NULL){
2139
server *next = mc.current_server->next;
2140
free(mc.current_server);
2141
mc.current_server = next;
2142
}
2143
}
2144
2145
/* XXX run network hooks "stop" here */
2146
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2150
errno = 0;
2151
ret = seteuid(0);
2152
if(ret == -1){
2153
perror_plus("seteuid");
2154
}
2155
if(geteuid() == 0){
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2157
if(ret == -1){
2158
perror_plus("ioctl SIOCGIFFLAGS");
2159
} else if(network.ifr_flags & IFF_UP) {
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2162
if(ret == -1){
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2164
}
2165
}
2166
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2167
if(ret == -1){
2168
perror_plus("close");
2169
}
2170
/* Lower privileges permanently */
2171
errno = 0;
2172
ret = setuid(uid);
2173
if(ret == -1){
2174
perror_plus("setuid");
2175
}
2176
}
2177
}
2178
2179
/* Removes the GPGME temp directory and all files inside */
1303
2180
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2181
struct dirent **direntries = NULL;
2182
struct dirent *direntry = NULL;
2183
int numentries = scandir(tempdir, &direntries, notdotentries,
2184
alphasort);
2185
if (numentries > 0){
2186
for(int i = 0; i < numentries; i++){
2187
direntry = direntries[i];
1324
2188
char *fullname = NULL;
1325
2189
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
2190
direntry->d_name);
1327
2191
if(ret < 0){
1328
perror("asprintf");
2192
perror_plus("asprintf");
1329
2193
continue;
1330
2194
}
1331
2195
ret = remove(fullname);
1335
2199
}
1336
2200
free(fullname);
1337
2201
}
1338
closedir(d);
2202
}
2203
2204
/* need to clean even if 0 because man page doesn't specify */
2205
free(direntries);
2206
if (numentries == -1){
2207
perror_plus("scandir");
1339
2208
}
1340
2209
ret = rmdir(tempdir);
1341
2210
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
2211
perror_plus("rmdir");
2212
}
2213
}
2214
2215
if(quit_now){
2216
sigemptyset(&old_sigterm_action.sa_mask);
2217
old_sigterm_action.sa_handler = SIG_DFL;
2218
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2219
&old_sigterm_action,
2220
NULL));
2221
if(ret == -1){
2222
perror_plus("sigaction");
2223
}
2224
do {
2225
ret = raise(signal_received);
2226
} while(ret != 0 and errno == EINTR);
2227
if(ret != 0){
2228
perror_plus("raise");
2229
abort();
2230
}
2231
TEMP_FAILURE_RETRY(pause());
1344
2232
}
1345
2233
1346
2234
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0