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237.2.113
(compared to revision 237.16.1)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-06-02 11:09:07 UTC
- mto: (24.1.138 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090602110907-utt933ql22lq8j7l
* plugins.d/mandos-client.c (main): Take down network interface on
exit if it was brought up.
exit if it was brought up.
- 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() */
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, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
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
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#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() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#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 */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
88
85
89
86
#ifdef __linux__
90
87
#include <sys/klog.h> /* klogctl() */
123
120
#define PATHDIR "/conf/conf.d/mandos"
124
121
#define SECKEY "seckey.txt"
125
122
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
127
123
128
124
bool debug = false;
129
125
static const char mandos_protocol_version[] = "1";
130
126
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;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
145
128
146
129
/* Used for passing in values through the Avahi callback functions */
147
130
typedef struct {
152
135
gnutls_dh_params_t dh_params;
153
136
const char *priority;
154
137
gpgme_ctx_t ctx;
155
server *current_server;
156
138
} mandos_context;
157
139
158
140
/* global context so signal handler can reach it*/
159
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
142
.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
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
144
174
145
/*
175
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
159
return buffer_capacity;
189
160
}
190
161
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
162
/*
230
163
* Initialize GPGME.
231
164
*/
232
165
static bool init_gpgme(const char *seckey,
233
166
const char *pubkey, const char *tempdir){
167
int ret;
234
168
gpgme_error_t rc;
235
169
gpgme_engine_info_t engine_info;
236
170
239
173
* Helper function to insert pub and seckey to the engine keyring.
240
174
*/
241
175
bool import_key(const char *filename){
242
int ret;
243
176
int fd;
244
177
gpgme_data_t pgp_data;
245
178
246
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
247
180
if(fd == -1){
248
perror_plus("open");
181
perror("open");
249
182
return false;
250
183
}
251
184
265
198
266
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
267
200
if(ret == -1){
268
perror_plus("close");
201
perror("close");
269
202
}
270
203
gpgme_data_release(pgp_data);
271
204
return true;
284
217
return false;
285
218
}
286
219
287
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
288
221
rc = gpgme_get_engine_info(&engine_info);
289
222
if(rc != GPG_ERR_NO_ERROR){
290
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
249
return false;
317
250
}
318
251
319
return true;
252
return true;
320
253
}
321
254
322
255
/*
396
329
397
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
398
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
399
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
400
333
plaintext_length = -1;
401
334
goto decrypt_end;
402
335
}
407
340
(size_t)plaintext_length,
408
341
plaintext_capacity);
409
342
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
343
perror("incbuffer");
411
344
plaintext_length = -1;
412
345
goto decrypt_end;
413
346
}
420
353
break;
421
354
}
422
355
if(ret < 0){
423
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
424
357
plaintext_length = -1;
425
358
goto decrypt_end;
426
359
}
483
416
}
484
417
485
418
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
487
420
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
489
425
safer_gnutls_strerror(ret));
490
426
gnutls_global_deinit();
491
427
return -1;
538
474
static int init_gnutls_session(gnutls_session_t *session){
539
475
int ret;
540
476
/* 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);
477
ret = gnutls_init(session, GNUTLS_SERVER);
547
478
if(ret != GNUTLS_E_SUCCESS){
548
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
480
safer_gnutls_strerror(ret));
551
482
552
483
{
553
484
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);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
561
486
if(ret != GNUTLS_E_SUCCESS){
562
487
fprintf(stderr, "Syntax error at: %s\n", err);
563
488
fprintf(stderr, "GnuTLS error: %s\n",
567
492
}
568
493
}
569
494
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);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
578
497
if(ret != GNUTLS_E_SUCCESS){
579
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
499
safer_gnutls_strerror(ret));
583
502
}
584
503
585
504
/* ignore client certificate if any. */
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
587
507
588
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
509
598
518
static int start_mandos_communication(const char *ip, uint16_t port,
599
519
AvahiIfIndex if_index,
600
520
int af){
601
int ret, tcp_sd = -1;
521
int ret, tcp_sd;
602
522
ssize_t sret;
603
523
union {
604
524
struct sockaddr_in in;
605
525
struct sockaddr_in6 in6;
606
526
} to;
607
527
char *buffer = NULL;
608
char *decrypted_buffer = NULL;
528
char *decrypted_buffer;
609
529
size_t buffer_length = 0;
610
530
size_t buffer_capacity = 0;
531
ssize_t decrypted_buffer_size;
611
532
size_t written;
612
int retval = -1;
533
int retval = 0;
613
534
gnutls_session_t session;
614
535
int pf; /* Protocol family */
615
536
616
errno = 0;
617
618
if(quit_now){
619
errno = EINTR;
620
return -1;
621
}
622
623
537
switch(af){
624
538
case AF_INET6:
625
539
pf = PF_INET6;
629
543
break;
630
544
default:
631
545
fprintf(stderr, "Bad address family: %d\n", af);
632
errno = EINVAL;
633
546
return -1;
634
547
}
635
548
645
558
646
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
647
560
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;
561
perror("socket");
562
return -1;
657
563
}
658
564
659
565
memset(&to, 0, sizeof(to));
665
571
ret = inet_pton(af, ip, &to.in.sin_addr);
666
572
}
667
573
if(ret < 0 ){
668
int e = errno;
669
perror_plus("inet_pton");
670
errno = e;
671
goto mandos_end;
574
perror("inet_pton");
575
return -1;
672
576
}
673
577
if(ret == 0){
674
int e = errno;
675
578
fprintf(stderr, "Bad address: %s\n", ip);
676
errno = e;
677
goto mandos_end;
579
return -1;
678
580
}
679
581
if(af == AF_INET6){
680
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
687
589
if(if_index == AVAHI_IF_UNSPEC){
688
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
591
" without a network interface\n");
690
errno = EINVAL;
691
goto mandos_end;
592
return -1;
692
593
}
693
594
/* Set the network interface number as scope */
694
595
to.in6.sin6_scope_id = (uint32_t)if_index;
699
600
-Wunreachable-code */
700
601
}
701
602
702
if(quit_now){
703
errno = EINTR;
704
goto mandos_end;
705
}
706
707
603
if(debug){
708
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
709
605
char interface[IF_NAMESIZE];
710
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
perror_plus("if_indextoname");
607
perror("if_indextoname");
712
608
} else {
713
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
610
ip, interface, port);
728
624
sizeof(addrstr));
729
625
}
730
626
if(pcret == NULL){
731
perror_plus("inet_ntop");
627
perror("inet_ntop");
732
628
} else {
733
629
if(strcmp(addrstr, ip) != 0){
734
630
fprintf(stderr, "Canonical address form: %s\n", addrstr);
736
632
}
737
633
}
738
634
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
635
if(af == AF_INET6){
745
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
637
} else {
747
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
639
}
749
640
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;
641
perror("connect");
642
return -1;
761
643
}
762
644
763
645
const char *out = mandos_protocol_version;
767
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
650
out_size - written));
769
651
if(ret == -1){
770
int e = errno;
771
perror_plus("write");
772
errno = e;
652
perror("write");
653
retval = -1;
773
654
goto mandos_end;
774
655
}
775
656
written += (size_t)ret;
783
664
break;
784
665
}
785
666
}
786
787
if(quit_now){
788
errno = EINTR;
789
goto mandos_end;
790
}
791
667
}
792
668
793
669
if(debug){
794
670
fprintf(stderr, "Establishing TLS session with %s\n", ip);
795
671
}
796
672
797
if(quit_now){
798
errno = EINTR;
799
goto mandos_end;
800
}
801
802
/* Spurious warning from -Wint-to-pointer-cast */
803
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
804
674
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
do {
675
do{
811
676
ret = gnutls_handshake(session);
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
816
677
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
817
678
818
679
if(ret != GNUTLS_E_SUCCESS){
820
681
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
821
682
gnutls_perror(ret);
822
683
}
823
errno = EPROTO;
684
retval = -1;
824
685
goto mandos_end;
825
686
}
826
687
832
693
}
833
694
834
695
while(true){
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
696
buffer_capacity = incbuffer(&buffer, buffer_length,
842
697
buffer_capacity);
843
698
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;
699
perror("incbuffer");
700
retval = -1;
852
701
goto mandos_end;
853
702
}
854
703
863
712
case GNUTLS_E_AGAIN:
864
713
break;
865
714
case GNUTLS_E_REHANDSHAKE:
866
do {
715
do{
867
716
ret = gnutls_handshake(session);
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
873
717
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
718
if(ret < 0){
875
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
876
720
gnutls_perror(ret);
877
errno = EPROTO;
721
retval = -1;
878
722
goto mandos_end;
879
723
}
880
724
break;
881
725
default:
882
726
fprintf(stderr, "Unknown error while reading data from"
883
727
" encrypted session with Mandos server\n");
728
retval = -1;
884
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
errno = EIO;
886
730
goto mandos_end;
887
731
}
888
732
} else {
894
738
fprintf(stderr, "Closing TLS session\n");
895
739
}
896
740
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);
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
909
742
910
743
if(buffer_length > 0){
911
ssize_t decrypted_buffer_size;
912
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
745
buffer_length,
914
746
&decrypted_buffer);
915
747
if(decrypted_buffer_size >= 0){
916
917
748
written = 0;
918
749
while(written < (size_t) decrypted_buffer_size){
919
if(quit_now){
920
errno = EINTR;
921
goto mandos_end;
922
}
923
924
750
ret = (int)fwrite(decrypted_buffer + written, 1,
925
751
(size_t)decrypted_buffer_size - written,
926
752
stdout);
927
753
if(ret == 0 and ferror(stdout)){
928
int e = errno;
929
754
if(debug){
930
755
fprintf(stderr, "Error writing encrypted data: %s\n",
931
756
strerror(errno));
932
757
}
933
errno = e;
934
goto mandos_end;
758
retval = -1;
759
break;
935
760
}
936
761
written += (size_t)ret;
937
762
}
938
retval = 0;
763
free(decrypted_buffer);
764
} else {
765
retval = -1;
939
766
}
767
} else {
768
retval = -1;
940
769
}
941
770
942
771
/* Shutdown procedure */
943
772
944
773
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
}
774
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
964
778
}
779
gnutls_deinit(session);
965
780
return retval;
966
781
}
967
782
984
799
/* Called whenever a service has been resolved successfully or
985
800
timed out */
986
801
987
if(quit_now){
988
return;
989
}
990
991
802
switch(event){
992
803
default:
993
804
case AVAHI_RESOLVER_FAILURE:
1009
820
avahi_proto_to_af(proto));
1010
821
if(ret == 0){
1011
822
avahi_simple_poll_quit(mc.simple_poll);
1012
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1015
823
}
1016
824
}
1017
825
}
1033
841
/* Called whenever a new services becomes available on the LAN or
1034
842
is removed from the LAN */
1035
843
1036
if(quit_now){
1037
return;
1038
}
1039
1040
844
switch(event){
1041
845
default:
1042
846
case AVAHI_BROWSER_FAILURE:
1071
875
}
1072
876
}
1073
877
1074
/* Signal handler that stops main loop after SIGTERM */
1075
static void handle_sigterm(int sig){
878
sig_atomic_t quit_now = 0;
879
880
/* stop main loop after sigterm has been called */
881
static void handle_sigterm(__attribute__((unused)) int sig){
1076
882
if(quit_now){
1077
883
return;
1078
884
}
1079
885
quit_now = 1;
1080
signal_received = sig;
1081
886
int old_errno = errno;
1082
/* set main loop to exit */
1083
887
if(mc.simple_poll != NULL){
1084
888
avahi_simple_poll_quit(mc.simple_poll);
1085
889
}
1086
890
errno = old_errno;
1087
891
}
1088
892
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
893
int main(int argc, char *argv[]){
1344
894
AvahiSServiceBrowser *sb = NULL;
1345
895
int error;
1347
897
intmax_t tmpmax;
1348
898
char *tmp;
1349
899
int exitcode = EXIT_SUCCESS;
1350
const char *interface = "";
900
const char *interface = "eth0";
1351
901
struct ifreq network;
1352
902
int sd = -1;
1353
bool take_down_interface = false;
903
bool interface_taken_up = false;
1354
904
uid_t uid;
1355
905
gid_t gid;
906
char *connect_to = NULL;
1356
907
char tempdir[] = "/tmp/mandosXXXXXX";
1357
908
bool tempdir_created = false;
1358
909
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1362
913
bool gnutls_initialized = false;
1363
914
bool gpgme_initialized = false;
1364
915
float delay = 2.5f;
1365
double retry_interval = 10; /* 10s between trying a server and
1366
retrying the same server again */
1367
916
1368
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
917
struct sigaction old_sigterm_action;
1369
918
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1370
919
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
920
{
1393
921
struct argp_option options[] = {
1394
922
{ .name = "debug", .key = 128,
1423
951
.arg = "SECONDS",
1424
952
.doc = "Maximum delay to wait for interface startup",
1425
953
.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
954
{ .name = NULL }
1440
955
};
1441
956
1442
957
error_t parse_opt(int key, char *arg,
1443
958
struct argp_state *state){
1444
errno = 0;
1445
959
switch(key){
1446
960
case 128: /* --debug */
1447
961
debug = true;
1463
977
tmpmax = strtoimax(arg, &tmp, 10);
1464
978
if(errno != 0 or tmp == arg or *tmp != '\0'
1465
979
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1466
argp_error(state, "Bad number of DH bits");
980
fprintf(stderr, "Bad number of DH bits\n");
981
exit(EXIT_FAILURE);
1467
982
}
1468
983
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1469
984
break;
1474
989
errno = 0;
1475
990
delay = strtof(arg, &tmp);
1476
991
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");
992
fprintf(stderr, "Bad delay\n");
993
exit(EXIT_FAILURE);
1486
994
}
1487
995
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);
996
case ARGP_KEY_ARG:
997
argp_usage(state);
998
case ARGP_KEY_END:
1501
999
break;
1502
1000
default:
1503
1001
return ARGP_ERR_UNKNOWN;
1504
1002
}
1505
return errno;
1003
return 0;
1506
1004
}
1507
1005
1508
1006
struct argp argp = { .options = options, .parser = parse_opt,
1509
1007
.args_doc = "",
1510
1008
.doc = "Mandos client -- Get and decrypt"
1511
1009
" 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);
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1014
goto end;
1015
}
1624
1016
}
1625
1017
1626
1018
if(not debug){
1627
1019
avahi_set_log_function(empty_log);
1628
1020
}
1629
1021
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
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1663
1023
from the signal handler */
1664
1024
/* Initialize the pseudo-RNG for Avahi */
1666
1026
mc.simple_poll = avahi_simple_poll_new();
1667
1027
if(mc.simple_poll == NULL){
1668
1028
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1669
exitcode = EX_UNAVAILABLE;
1029
exitcode = EXIT_FAILURE;
1670
1030
goto end;
1671
1031
}
1672
1032
1673
1033
sigemptyset(&sigterm_action.sa_mask);
1674
1034
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1675
1035
if(ret == -1){
1676
perror_plus("sigaddset");
1677
exitcode = EX_OSERR;
1036
perror("sigaddset");
1037
exitcode = EXIT_FAILURE;
1678
1038
goto end;
1679
1039
}
1680
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1681
1041
if(ret == -1){
1682
perror_plus("sigaddset");
1683
exitcode = EX_OSERR;
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1684
1044
goto end;
1685
1045
}
1686
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1687
1047
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
}
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1735
1058
1736
1059
/* 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
1060
if(interface[0] != '\0'){
1756
1061
#ifdef __linux__
1757
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1063
messages to mess up the prompt */
1759
1064
ret = klogctl(8, NULL, 5);
1760
1065
bool restore_loglevel = true;
1761
1066
if(ret == -1){
1762
1067
restore_loglevel = false;
1763
perror_plus("klogctl");
1068
perror("klogctl");
1764
1069
}
1765
1070
#endif /* __linux__ */
1766
1071
1767
1072
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1768
1073
if(sd < 0){
1769
perror_plus("socket");
1770
exitcode = EX_OSERR;
1074
perror("socket");
1075
exitcode = EXIT_FAILURE;
1771
1076
#ifdef __linux__
1772
1077
if(restore_loglevel){
1773
1078
ret = klogctl(7, NULL, 0);
1774
1079
if(ret == -1){
1775
perror_plus("klogctl");
1080
perror("klogctl");
1776
1081
}
1777
1082
}
1778
1083
#endif /* __linux__ */
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
1084
goto end;
1786
1085
}
1787
1086
strcpy(network.ifr_name, interface);
1788
1087
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1789
1088
if(ret == -1){
1790
perror_plus("ioctl SIOCGIFFLAGS");
1089
perror("ioctl SIOCGIFFLAGS");
1791
1090
#ifdef __linux__
1792
1091
if(restore_loglevel){
1793
1092
ret = klogctl(7, NULL, 0);
1794
1093
if(ret == -1){
1795
perror_plus("klogctl");
1094
perror("klogctl");
1796
1095
}
1797
1096
}
1798
1097
#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
}
1098
exitcode = EXIT_FAILURE;
1806
1099
goto end;
1807
1100
}
1808
1101
if((network.ifr_flags & IFF_UP) == 0){
1809
1102
network.ifr_flags |= IFF_UP;
1810
take_down_interface = true;
1811
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1812
1104
if(ret == -1){
1813
take_down_interface = false;
1814
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1815
exitcode = EX_OSERR;
1105
perror("ioctl SIOCSIFFLAGS");
1106
exitcode = EXIT_FAILURE;
1816
1107
#ifdef __linux__
1817
1108
if(restore_loglevel){
1818
1109
ret = klogctl(7, NULL, 0);
1819
1110
if(ret == -1){
1820
perror_plus("klogctl");
1111
perror("klogctl");
1821
1112
}
1822
1113
}
1823
1114
#endif /* __linux__ */
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
1115
goto end;
1831
1116
}
1117
interface_taken_up = true;
1832
1118
}
1833
/* Sleep checking until interface is running.
1834
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1835
1120
for(int i=0; i < delay * 4; i++){
1836
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1837
1122
if(ret == -1){
1838
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1839
1124
} else if(network.ifr_flags & IFF_RUNNING){
1840
1125
break;
1841
1126
}
1842
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1843
1128
ret = nanosleep(&sleeptime, NULL);
1844
1129
if(ret == -1 and errno != EINTR){
1845
perror_plus("nanosleep");
1130
perror("nanosleep");
1846
1131
}
1847
1132
}
1848
if(not take_down_interface){
1849
/* We won't need the socket anymore */
1133
if(not interface_taken_up){
1850
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1851
1135
if(ret == -1){
1852
perror_plus("close");
1136
perror("close");
1853
1137
}
1854
1138
}
1855
1139
#ifdef __linux__
1857
1141
/* Restores kernel loglevel to default */
1858
1142
ret = klogctl(7, NULL, 0);
1859
1143
if(ret == -1){
1860
perror_plus("klogctl");
1144
perror("klogctl");
1861
1145
}
1862
1146
}
1863
1147
#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;
1148
}
1149
1150
uid = getuid();
1151
gid = getgid();
1152
1153
errno = 0;
1154
setgid(gid);
1155
if(ret == -1){
1156
perror("setgid");
1157
}
1158
1159
ret = setuid(uid);
1160
if(ret == -1){
1161
perror("setuid");
1883
1162
}
1884
1163
1885
1164
ret = init_gnutls_global(pubkey, seckey);
1886
1165
if(ret == -1){
1887
1166
fprintf(stderr, "init_gnutls_global failed\n");
1888
exitcode = EX_UNAVAILABLE;
1167
exitcode = EXIT_FAILURE;
1889
1168
goto end;
1890
1169
} else {
1891
1170
gnutls_initialized = true;
1892
1171
}
1893
1172
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
1173
if(mkdtemp(tempdir) == NULL){
1899
perror_plus("mkdtemp");
1174
perror("mkdtemp");
1900
1175
goto end;
1901
1176
}
1902
1177
tempdir_created = true;
1903
1178
1904
if(quit_now){
1905
goto end;
1906
}
1907
1908
1179
if(not init_gpgme(pubkey, seckey, tempdir)){
1909
1180
fprintf(stderr, "init_gpgme failed\n");
1910
exitcode = EX_UNAVAILABLE;
1181
exitcode = EXIT_FAILURE;
1911
1182
goto end;
1912
1183
} else {
1913
1184
gpgme_initialized = true;
1914
1185
}
1915
1186
1916
if(quit_now){
1917
goto end;
1187
if(interface[0] != '\0'){
1188
if_index = (AvahiIfIndex) if_nametoindex(interface);
1189
if(if_index == 0){
1190
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1191
exitcode = EXIT_FAILURE;
1192
goto end;
1193
}
1918
1194
}
1919
1195
1920
1196
if(connect_to != NULL){
1923
1199
char *address = strrchr(connect_to, ':');
1924
1200
if(address == NULL){
1925
1201
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
1202
exitcode = EXIT_FAILURE;
1203
goto end;
1204
}
1934
1205
uint16_t port;
1935
1206
errno = 0;
1936
1207
tmpmax = strtoimax(address+1, &tmp, 10);
1937
1208
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1938
1209
or tmpmax != (uint16_t)tmpmax){
1939
1210
fprintf(stderr, "Bad port number\n");
1940
exitcode = EX_USAGE;
1941
goto end;
1942
}
1943
1944
if(quit_now){
1945
goto end;
1946
}
1947
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1948
1214
port = (uint16_t)tmpmax;
1949
1215
*address = '\0';
1216
address = connect_to;
1950
1217
/* Colon in address indicates IPv6 */
1951
1218
int af;
1952
if(strchr(connect_to, ':') != NULL){
1219
if(strchr(address, ':') != NULL){
1953
1220
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
1221
} else {
1961
1222
af = AF_INET;
1962
1223
}
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){
1224
ret = start_mandos_communication(address, port, if_index, af);
1225
if(ret < 0){
1226
exitcode = EXIT_FAILURE;
1227
} else {
1982
1228
exitcode = EXIT_SUCCESS;
1983
1229
}
1230
goto end;
1231
}
1984
1232
1985
goto end;
1986
}
1987
1988
if(quit_now){
1989
goto end;
1990
}
1991
1992
1233
{
1993
1234
AvahiServerConfig config;
1994
1235
/* Do not publish any local Zeroconf records */
2011
1252
if(mc.server == NULL){
2012
1253
fprintf(stderr, "Failed to create Avahi server: %s\n",
2013
1254
avahi_strerror(error));
2014
exitcode = EX_UNAVAILABLE;
2015
goto end;
2016
}
2017
2018
if(quit_now){
1255
exitcode = EXIT_FAILURE;
2019
1256
goto end;
2020
1257
}
2021
1258
2026
1263
if(sb == NULL){
2027
1264
fprintf(stderr, "Failed to create service browser: %s\n",
2028
1265
avahi_strerror(avahi_server_errno(mc.server)));
2029
exitcode = EX_UNAVAILABLE;
2030
goto end;
2031
}
2032
2033
if(quit_now){
1266
exitcode = EXIT_FAILURE;
2034
1267
goto end;
2035
1268
}
2036
1269
2039
1272
if(debug){
2040
1273
fprintf(stderr, "Starting Avahi loop search\n");
2041
1274
}
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
}
1275
1276
avahi_simple_poll_loop(mc.simple_poll);
2049
1277
2050
1278
end:
2051
1279
2072
1300
if(gpgme_initialized){
2073
1301
gpgme_release(mc.ctx);
2074
1302
}
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
1303
2089
1304
/* Take down the network interface */
2090
if(take_down_interface){
2091
/* Re-raise priviliges */
2092
errno = 0;
2093
ret = seteuid(0);
1305
if(interface_taken_up){
1306
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2094
1307
if(ret == -1){
2095
perror_plus("seteuid");
1308
perror("ioctl SIOCGIFFLAGS");
1309
} else if(network.ifr_flags & IFF_UP) {
1310
network.ifr_flags &= ~IFF_UP; /* clear flag */
1311
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1312
if(ret == -1){
1313
perror("ioctl SIOCSIFFLAGS");
1314
}
2096
1315
}
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
}
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
2118
1319
}
2119
1320
}
2120
1321
2121
/* Removes the GPGME temp directory and all files inside */
1322
/* Removes the temp directory used by GPGME */
2122
1323
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];
1324
DIR *d;
1325
struct dirent *direntry;
1326
d = opendir(tempdir);
1327
if(d == NULL){
1328
if(errno != ENOENT){
1329
perror("opendir");
1330
}
1331
} else {
1332
while(true){
1333
direntry = readdir(d);
1334
if(direntry == NULL){
1335
break;
1336
}
1337
/* Skip "." and ".." */
1338
if(direntry->d_name[0] == '.'
1339
and (direntry->d_name[1] == '\0'
1340
or (direntry->d_name[1] == '.'
1341
and direntry->d_name[2] == '\0'))){
1342
continue;
1343
}
2130
1344
char *fullname = NULL;
2131
1345
ret = asprintf(&fullname, "%s/%s", tempdir,
2132
1346
direntry->d_name);
2133
1347
if(ret < 0){
2134
perror_plus("asprintf");
1348
perror("asprintf");
2135
1349
continue;
2136
1350
}
2137
1351
ret = remove(fullname);
2141
1355
}
2142
1356
free(fullname);
2143
1357
}
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");
1358
closedir(d);
2150
1359
}
2151
1360
ret = rmdir(tempdir);
2152
1361
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());
1362
perror("rmdir");
1363
}
2174
1364
}
2175
1365
2176
1366
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0