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237.2.109
(compared to revision 237.15.4)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-05-23 05:59:52 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-20090523055952-wvnp7le0io6ttqni
Merge from release branch.
- 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() */
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
}
173
174
int fprintf_plus(FILE *stream, const char *format, ...){
175
va_list ap;
176
va_start (ap, format);
177
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
179
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
180
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
181
144
182
145
/*
183
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
196
159
return buffer_capacity;
197
160
}
198
161
199
/* Add server to set of servers to retry periodically */
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
int af){
203
int ret;
204
server *new_server = malloc(sizeof(server));
205
if(new_server == NULL){
206
perror_plus("malloc");
207
return -1;
208
}
209
*new_server = (server){ .ip = strdup(ip),
210
.port = port,
211
.if_index = if_index,
212
.af = af };
213
if(new_server->ip == NULL){
214
perror_plus("strdup");
215
return -1;
216
}
217
/* Special case of first server */
218
if (mc.current_server == NULL){
219
new_server->next = new_server;
220
new_server->prev = new_server;
221
mc.current_server = new_server;
222
/* Place the new server last in the list */
223
} else {
224
new_server->next = mc.current_server;
225
new_server->prev = mc.current_server->prev;
226
new_server->prev->next = new_server;
227
mc.current_server->prev = new_server;
228
}
229
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
if(ret == -1){
231
perror_plus("clock_gettime");
232
return -1;
233
}
234
return 0;
235
}
236
237
162
/*
238
163
* Initialize GPGME.
239
164
*/
240
165
static bool init_gpgme(const char *seckey,
241
166
const char *pubkey, const char *tempdir){
167
int ret;
242
168
gpgme_error_t rc;
243
169
gpgme_engine_info_t engine_info;
244
170
247
173
* Helper function to insert pub and seckey to the engine keyring.
248
174
*/
249
175
bool import_key(const char *filename){
250
int ret;
251
176
int fd;
252
177
gpgme_data_t pgp_data;
253
178
254
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
255
180
if(fd == -1){
256
perror_plus("open");
181
perror("open");
257
182
return false;
258
183
}
259
184
273
198
274
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
275
200
if(ret == -1){
276
perror_plus("close");
201
perror("close");
277
202
}
278
203
gpgme_data_release(pgp_data);
279
204
return true;
292
217
return false;
293
218
}
294
219
295
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
296
221
rc = gpgme_get_engine_info(&engine_info);
297
222
if(rc != GPG_ERR_NO_ERROR){
298
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
324
249
return false;
325
250
}
326
251
327
return true;
252
return true;
328
253
}
329
254
330
255
/*
384
309
}
385
310
gpgme_recipient_t recipient;
386
311
recipient = result->recipients;
387
while(recipient != NULL){
388
fprintf(stderr, "Public key algorithm: %s\n",
389
gpgme_pubkey_algo_name(recipient->pubkey_algo));
390
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
391
fprintf(stderr, "Secret key available: %s\n",
392
recipient->status == GPG_ERR_NO_SECKEY
393
? "No" : "Yes");
394
recipient = recipient->next;
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
}
395
322
}
396
323
}
397
324
}
404
331
405
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
406
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
407
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
408
335
plaintext_length = -1;
409
336
goto decrypt_end;
410
337
}
415
342
(size_t)plaintext_length,
416
343
plaintext_capacity);
417
344
if(plaintext_capacity == 0){
418
perror_plus("incbuffer");
345
perror("incbuffer");
419
346
plaintext_length = -1;
420
347
goto decrypt_end;
421
348
}
428
355
break;
429
356
}
430
357
if(ret < 0){
431
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
432
359
plaintext_length = -1;
433
360
goto decrypt_end;
434
361
}
491
418
}
492
419
493
420
/* OpenPGP credentials */
494
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
495
422
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "GnuTLS memory error: %s\n",
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
497
427
safer_gnutls_strerror(ret));
498
428
gnutls_global_deinit();
499
429
return -1;
546
476
static int init_gnutls_session(gnutls_session_t *session){
547
477
int ret;
548
478
/* GnuTLS session creation */
549
do {
550
ret = gnutls_init(session, GNUTLS_SERVER);
551
if(quit_now){
552
return -1;
553
}
554
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
555
480
if(ret != GNUTLS_E_SUCCESS){
556
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
557
482
safer_gnutls_strerror(ret));
559
484
560
485
{
561
486
const char *err;
562
do {
563
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
564
if(quit_now){
565
gnutls_deinit(*session);
566
return -1;
567
}
568
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
569
488
if(ret != GNUTLS_E_SUCCESS){
570
489
fprintf(stderr, "Syntax error at: %s\n", err);
571
490
fprintf(stderr, "GnuTLS error: %s\n",
575
494
}
576
495
}
577
496
578
do {
579
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
581
if(quit_now){
582
gnutls_deinit(*session);
583
return -1;
584
}
585
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
586
499
if(ret != GNUTLS_E_SUCCESS){
587
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
501
safer_gnutls_strerror(ret));
591
504
}
592
505
593
506
/* ignore client certificate if any. */
594
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
595
509
596
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
597
511
606
520
static int start_mandos_communication(const char *ip, uint16_t port,
607
521
AvahiIfIndex if_index,
608
522
int af){
609
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
610
524
ssize_t sret;
611
525
union {
612
526
struct sockaddr_in in;
613
527
struct sockaddr_in6 in6;
614
528
} to;
615
529
char *buffer = NULL;
616
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
617
531
size_t buffer_length = 0;
618
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
619
534
size_t written;
620
int retval = -1;
535
int retval = 0;
621
536
gnutls_session_t session;
622
537
int pf; /* Protocol family */
623
538
624
errno = 0;
625
626
if(quit_now){
627
errno = EINTR;
628
return -1;
629
}
630
631
539
switch(af){
632
540
case AF_INET6:
633
541
pf = PF_INET6;
637
545
break;
638
546
default:
639
547
fprintf(stderr, "Bad address family: %d\n", af);
640
errno = EINVAL;
641
548
return -1;
642
549
}
643
550
653
560
654
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
655
562
if(tcp_sd < 0){
656
int e = errno;
657
perror_plus("socket");
658
errno = e;
659
goto mandos_end;
660
}
661
662
if(quit_now){
663
errno = EINTR;
664
goto mandos_end;
563
perror("socket");
564
return -1;
665
565
}
666
566
667
567
memset(&to, 0, sizeof(to));
673
573
ret = inet_pton(af, ip, &to.in.sin_addr);
674
574
}
675
575
if(ret < 0 ){
676
int e = errno;
677
perror_plus("inet_pton");
678
errno = e;
679
goto mandos_end;
576
perror("inet_pton");
577
return -1;
680
578
}
681
579
if(ret == 0){
682
int e = errno;
683
580
fprintf(stderr, "Bad address: %s\n", ip);
684
errno = e;
685
goto mandos_end;
581
return -1;
686
582
}
687
583
if(af == AF_INET6){
688
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
695
591
if(if_index == AVAHI_IF_UNSPEC){
696
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
593
" without a network interface\n");
698
errno = EINVAL;
699
goto mandos_end;
594
return -1;
700
595
}
701
596
/* Set the network interface number as scope */
702
597
to.in6.sin6_scope_id = (uint32_t)if_index;
707
602
-Wunreachable-code */
708
603
}
709
604
710
if(quit_now){
711
errno = EINTR;
712
goto mandos_end;
713
}
714
715
605
if(debug){
716
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
717
607
char interface[IF_NAMESIZE];
718
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
perror_plus("if_indextoname");
609
perror("if_indextoname");
720
610
} else {
721
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
612
ip, interface, port);
736
626
sizeof(addrstr));
737
627
}
738
628
if(pcret == NULL){
739
perror_plus("inet_ntop");
629
perror("inet_ntop");
740
630
} else {
741
631
if(strcmp(addrstr, ip) != 0){
742
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
744
634
}
745
635
}
746
636
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
637
if(af == AF_INET6){
753
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
754
639
} else {
755
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
756
641
}
757
642
if(ret < 0){
758
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
759
int e = errno;
760
perror_plus("connect");
761
errno = e;
762
}
763
goto mandos_end;
764
}
765
766
if(quit_now){
767
errno = EINTR;
768
goto mandos_end;
643
perror("connect");
644
return -1;
769
645
}
770
646
771
647
const char *out = mandos_protocol_version;
775
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
776
652
out_size - written));
777
653
if(ret == -1){
778
int e = errno;
779
perror_plus("write");
780
errno = e;
654
perror("write");
655
retval = -1;
781
656
goto mandos_end;
782
657
}
783
658
written += (size_t)ret;
791
666
break;
792
667
}
793
668
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
669
}
800
670
801
671
if(debug){
802
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
803
673
}
804
674
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
/* Spurious warning from -Wint-to-pointer-cast */
811
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
812
676
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
816
}
817
818
do {
677
do{
819
678
ret = gnutls_handshake(session);
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
823
}
824
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
825
680
826
681
if(ret != GNUTLS_E_SUCCESS){
828
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
829
684
gnutls_perror(ret);
830
685
}
831
errno = EPROTO;
686
retval = -1;
832
687
goto mandos_end;
833
688
}
834
689
840
695
}
841
696
842
697
while(true){
843
844
if(quit_now){
845
errno = EINTR;
846
goto mandos_end;
847
}
848
849
698
buffer_capacity = incbuffer(&buffer, buffer_length,
850
699
buffer_capacity);
851
700
if(buffer_capacity == 0){
852
int e = errno;
853
perror_plus("incbuffer");
854
errno = e;
855
goto mandos_end;
856
}
857
858
if(quit_now){
859
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
860
703
goto mandos_end;
861
704
}
862
705
871
714
case GNUTLS_E_AGAIN:
872
715
break;
873
716
case GNUTLS_E_REHANDSHAKE:
874
do {
717
do{
875
718
ret = gnutls_handshake(session);
876
877
if(quit_now){
878
errno = EINTR;
879
goto mandos_end;
880
}
881
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
882
720
if(ret < 0){
883
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
884
722
gnutls_perror(ret);
885
errno = EPROTO;
723
retval = -1;
886
724
goto mandos_end;
887
725
}
888
726
break;
889
727
default:
890
728
fprintf(stderr, "Unknown error while reading data from"
891
729
" encrypted session with Mandos server\n");
730
retval = -1;
892
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
893
errno = EIO;
894
732
goto mandos_end;
895
733
}
896
734
} else {
902
740
fprintf(stderr, "Closing TLS session\n");
903
741
}
904
742
905
if(quit_now){
906
errno = EINTR;
907
goto mandos_end;
908
}
909
910
do {
911
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
if(quit_now){
913
errno = EINTR;
914
goto mandos_end;
915
}
916
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
917
744
918
745
if(buffer_length > 0){
919
ssize_t decrypted_buffer_size;
920
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
921
747
buffer_length,
922
748
&decrypted_buffer);
923
749
if(decrypted_buffer_size >= 0){
924
925
750
written = 0;
926
751
while(written < (size_t) decrypted_buffer_size){
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
932
752
ret = (int)fwrite(decrypted_buffer + written, 1,
933
753
(size_t)decrypted_buffer_size - written,
934
754
stdout);
935
755
if(ret == 0 and ferror(stdout)){
936
int e = errno;
937
756
if(debug){
938
757
fprintf(stderr, "Error writing encrypted data: %s\n",
939
758
strerror(errno));
940
759
}
941
errno = e;
942
goto mandos_end;
760
retval = -1;
761
break;
943
762
}
944
763
written += (size_t)ret;
945
764
}
946
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
947
768
}
769
} else {
770
retval = -1;
948
771
}
949
772
950
773
/* Shutdown procedure */
951
774
952
775
mandos_end:
953
{
954
int e = errno;
955
free(decrypted_buffer);
956
free(buffer);
957
if(tcp_sd >= 0){
958
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
959
}
960
if(ret == -1){
961
if(e == 0){
962
e = errno;
963
}
964
perror_plus("close");
965
}
966
gnutls_deinit(session);
967
errno = e;
968
if(quit_now){
969
errno = EINTR;
970
retval = -1;
971
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
972
780
}
781
gnutls_deinit(session);
973
782
return retval;
974
783
}
975
784
992
801
/* Called whenever a service has been resolved successfully or
993
802
timed out */
994
803
995
if(quit_now){
996
return;
997
}
998
999
804
switch(event){
1000
805
default:
1001
806
case AVAHI_RESOLVER_FAILURE:
1017
822
avahi_proto_to_af(proto));
1018
823
if(ret == 0){
1019
824
avahi_simple_poll_quit(mc.simple_poll);
1020
} else {
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
1023
825
}
1024
826
}
1025
827
}
1041
843
/* Called whenever a new services becomes available on the LAN or
1042
844
is removed from the LAN */
1043
845
1044
if(quit_now){
1045
return;
1046
}
1047
1048
846
switch(event){
1049
847
default:
1050
848
case AVAHI_BROWSER_FAILURE:
1079
877
}
1080
878
}
1081
879
1082
/* Signal handler that stops main loop after SIGTERM */
1083
static void handle_sigterm(int sig){
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){
1084
884
if(quit_now){
1085
885
return;
1086
886
}
1087
887
quit_now = 1;
1088
signal_received = sig;
1089
888
int old_errno = errno;
1090
/* set main loop to exit */
1091
889
if(mc.simple_poll != NULL){
1092
890
avahi_simple_poll_quit(mc.simple_poll);
1093
891
}
1094
892
errno = old_errno;
1095
893
}
1096
894
1097
bool get_flags(const char *ifname, struct ifreq *ifr){
1098
int ret;
1099
1100
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1101
if(s < 0){
1102
perror_plus("socket");
1103
return false;
1104
}
1105
strcpy(ifr->ifr_name, ifname);
1106
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1107
if(ret == -1){
1108
if(debug){
1109
perror_plus("ioctl SIOCGIFFLAGS");
1110
}
1111
return false;
1112
}
1113
return true;
1114
}
1115
1116
bool good_flags(const char *ifname, const struct ifreq *ifr){
1117
1118
/* Reject the loopback device */
1119
if(ifr->ifr_flags & IFF_LOOPBACK){
1120
if(debug){
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1123
}
1124
return false;
1125
}
1126
/* Accept point-to-point devices only if connect_to is specified */
1127
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1128
if(debug){
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1131
}
1132
return true;
1133
}
1134
/* Otherwise, reject non-broadcast-capable devices */
1135
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1139
}
1140
return false;
1141
}
1142
/* Reject non-ARP interfaces (including dummy interfaces) */
1143
if(ifr->ifr_flags & IFF_NOARP){
1144
if(debug){
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1146
}
1147
return false;
1148
}
1149
1150
/* Accept this device */
1151
if(debug){
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1153
}
1154
return true;
1155
}
1156
1157
/*
1158
* This function determines if a directory entry in /sys/class/net
1159
* corresponds to an acceptable network device.
1160
* (This function is passed to scandir(3) as a filter function.)
1161
*/
1162
int good_interface(const struct dirent *if_entry){
1163
int ret;
1164
if(if_entry->d_name[0] == '.'){
1165
return 0;
1166
}
1167
struct ifreq ifr;
1168
1169
if(not get_flags(if_entry->d_name, &ifr)){
1170
return 0;
1171
}
1172
1173
if(not good_flags(if_entry->d_name, &ifr)){
1174
return 0;
1175
}
1176
return 1;
1177
}
1178
1179
/*
1180
* This function determines if a directory entry in /sys/class/net
1181
* corresponds to an acceptable network device which is up.
1182
* (This function is passed to scandir(3) as a filter function.)
1183
*/
1184
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1256
}
1257
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1286
}
1287
return 1;
1288
}
1289
1290
int notdotentries(const struct dirent *direntry){
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
1296
return 0;
1297
}
1298
return 1;
1299
}
1300
1301
/* Is this directory entry a runnable program? */
1302
int runnable_hook(const struct dirent *direntry){
1303
int ret;
1304
struct stat st;
1305
1306
if((direntry->d_name)[0] == '\0'){
1307
/* Empty name? */
1308
return 0;
1309
}
1310
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
1328
if(ret == -1){
1329
if(debug){
1330
perror_plus("Could not stat plugin");
1331
}
1332
return 0;
1333
}
1334
if(not (st.st_mode & S_ISREG)){
1335
/* Not a regular file */
1336
return 0;
1337
}
1338
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1339
/* Not executable */
1340
return 0;
1341
}
1342
return 1;
1343
}
1344
1345
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1346
int ret;
1347
struct timespec now;
1348
struct timespec waited_time;
1349
intmax_t block_time;
1350
1351
while(true){
1352
if(mc.current_server == NULL){
1353
if (debug){
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1356
}
1357
ret = avahi_simple_poll_iterate(s, -1);
1358
} else {
1359
if (debug){
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1362
}
1363
/* the current time */
1364
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
/* Calculating in ms how long time between now and server
1370
who we visted longest time ago. Now - last seen. */
1371
waited_time.tv_sec = (now.tv_sec
1372
- mc.current_server->last_seen.tv_sec);
1373
waited_time.tv_nsec = (now.tv_nsec
1374
- mc.current_server->last_seen.tv_nsec);
1375
/* total time is 10s/10,000ms.
1376
Converting to s from ms by dividing by 1,000,
1377
and ns to ms by dividing by 1,000,000. */
1378
block_time = ((retry_interval
1379
- ((intmax_t)waited_time.tv_sec * 1000))
1380
- ((intmax_t)waited_time.tv_nsec / 1000000));
1381
1382
if (debug){
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1384
}
1385
1386
if(block_time <= 0){
1387
ret = start_mandos_communication(mc.current_server->ip,
1388
mc.current_server->port,
1389
mc.current_server->if_index,
1390
mc.current_server->af);
1391
if(ret == 0){
1392
avahi_simple_poll_quit(mc.simple_poll);
1393
return 0;
1394
}
1395
ret = clock_gettime(CLOCK_MONOTONIC,
1396
&mc.current_server->last_seen);
1397
if(ret == -1){
1398
perror_plus("clock_gettime");
1399
return -1;
1400
}
1401
mc.current_server = mc.current_server->next;
1402
block_time = 0; /* Call avahi to find new Mandos
1403
servers, but don't block */
1404
}
1405
1406
ret = avahi_simple_poll_iterate(s, (int)block_time);
1407
}
1408
if(ret != 0){
1409
if (ret > 0 or errno != EINTR) {
1410
return (ret != 1) ? ret : 0;
1411
}
1412
}
1413
}
1414
}
1415
1416
895
int main(int argc, char *argv[]){
1417
896
AvahiSServiceBrowser *sb = NULL;
1418
897
int error;
1420
899
intmax_t tmpmax;
1421
900
char *tmp;
1422
901
int exitcode = EXIT_SUCCESS;
1423
const char *interface = "";
902
const char *interface = "eth0";
1424
903
struct ifreq network;
1425
int sd = -1;
1426
bool take_down_interface = false;
904
int sd;
1427
905
uid_t uid;
1428
906
gid_t gid;
907
char *connect_to = NULL;
1429
908
char tempdir[] = "/tmp/mandosXXXXXX";
1430
909
bool tempdir_created = false;
1431
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1435
914
bool gnutls_initialized = false;
1436
915
bool gpgme_initialized = false;
1437
916
float delay = 2.5f;
1438
double retry_interval = 10; /* 10s between trying a server and
1439
retrying the same server again */
1440
917
1441
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1442
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1443
920
1444
uid = getuid();
1445
gid = getgid();
1446
1447
/* Lower any group privileges we might have, just to be safe */
1448
errno = 0;
1449
ret = setgid(gid);
1450
if(ret == -1){
1451
perror_plus("setgid");
1452
}
1453
1454
/* Lower user privileges (temporarily) */
1455
errno = 0;
1456
ret = seteuid(uid);
1457
if(ret == -1){
1458
perror_plus("seteuid");
1459
}
1460
1461
if(quit_now){
1462
goto end;
1463
}
1464
1465
921
{
1466
922
struct argp_option options[] = {
1467
923
{ .name = "debug", .key = 128,
1496
952
.arg = "SECONDS",
1497
953
.doc = "Maximum delay to wait for interface startup",
1498
954
.group = 2 },
1499
{ .name = "retry", .key = 132,
1500
.arg = "SECONDS",
1501
.doc = "Retry interval used when denied by the mandos server",
1502
.group = 2 },
1503
/*
1504
* These reproduce what we would get without ARGP_NO_HELP
1505
*/
1506
{ .name = "help", .key = '?',
1507
.doc = "Give this help list", .group = -1 },
1508
{ .name = "usage", .key = -3,
1509
.doc = "Give a short usage message", .group = -1 },
1510
{ .name = "version", .key = 'V',
1511
.doc = "Print program version", .group = -1 },
1512
955
{ .name = NULL }
1513
956
};
1514
957
1515
958
error_t parse_opt(int key, char *arg,
1516
959
struct argp_state *state){
1517
errno = 0;
1518
960
switch(key){
1519
961
case 128: /* --debug */
1520
962
debug = true;
1536
978
tmpmax = strtoimax(arg, &tmp, 10);
1537
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1538
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1539
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1540
983
}
1541
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1542
985
break;
1547
990
errno = 0;
1548
991
delay = strtof(arg, &tmp);
1549
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1550
argp_error(state, "Bad delay");
1551
}
1552
case 132: /* --retry */
1553
errno = 0;
1554
retry_interval = strtod(arg, &tmp);
1555
if(errno != 0 or tmp == arg or *tmp != '\0'
1556
or (retry_interval * 1000) > INT_MAX
1557
or retry_interval < 0){
1558
argp_error(state, "Bad retry interval");
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
1559
995
}
1560
996
break;
1561
/*
1562
* These reproduce what we would get without ARGP_NO_HELP
1563
*/
1564
case '?': /* --help */
1565
argp_state_help(state, state->out_stream,
1566
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1567
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1568
case -3: /* --usage */
1569
argp_state_help(state, state->out_stream,
1570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1571
case 'V': /* --version */
1572
fprintf(state->out_stream, "%s\n", argp_program_version);
1573
exit(argp_err_exit_status);
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1574
1000
break;
1575
1001
default:
1576
1002
return ARGP_ERR_UNKNOWN;
1577
1003
}
1578
return errno;
1004
return 0;
1579
1005
}
1580
1006
1581
1007
struct argp argp = { .options = options, .parser = parse_opt,
1582
1008
.args_doc = "",
1583
1009
.doc = "Mandos client -- Get and decrypt"
1584
1010
" passwords from a Mandos server" };
1585
ret = argp_parse(&argp, argc, argv,
1586
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1587
switch(ret){
1588
case 0:
1589
break;
1590
case ENOMEM:
1591
default:
1592
errno = ret;
1593
perror_plus("argp_parse");
1594
exitcode = EX_OSERR;
1595
goto end;
1596
case EINVAL:
1597
exitcode = EX_USAGE;
1598
goto end;
1599
}
1600
}
1601
1602
{
1603
/* Work around Debian bug #633582:
1604
<http://bugs.debian.org/633582> */
1605
struct stat st;
1606
1607
/* Re-raise priviliges */
1608
errno = 0;
1609
ret = seteuid(0);
1610
if(ret == -1){
1611
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1659
}
1660
}
1661
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
1693
goto end;
1694
}
1695
}
1696
close(devnull);
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
}
1697
1017
}
1698
1018
1699
1019
if(not debug){
1700
1020
avahi_set_log_function(empty_log);
1701
1021
}
1702
1022
1703
if(interface[0] == '\0'){
1704
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1706
alphasort);
1707
if(ret >= 1){
1708
/* Pick the first good interface */
1709
interface = strdup(direntries[0]->d_name);
1710
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1712
}
1713
if(interface == NULL){
1714
perror_plus("malloc");
1715
free(direntries);
1716
exitcode = EXIT_FAILURE;
1717
goto end;
1718
}
1719
free(direntries);
1720
} else {
1721
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1723
exitcode = EXIT_FAILURE;
1724
goto end;
1725
}
1726
}
1727
1728
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1729
1024
from the signal handler */
1730
1025
/* Initialize the pseudo-RNG for Avahi */
1732
1027
mc.simple_poll = avahi_simple_poll_new();
1733
1028
if(mc.simple_poll == NULL){
1734
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1735
exitcode = EX_UNAVAILABLE;
1030
exitcode = EXIT_FAILURE;
1736
1031
goto end;
1737
1032
}
1738
1033
1739
1034
sigemptyset(&sigterm_action.sa_mask);
1740
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1741
1036
if(ret == -1){
1742
perror_plus("sigaddset");
1743
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1744
1039
goto end;
1745
1040
}
1746
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1747
1042
if(ret == -1){
1748
perror_plus("sigaddset");
1749
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1750
1045
goto end;
1751
1046
}
1752
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1753
1048
if(ret == -1){
1754
perror_plus("sigaddset");
1755
exitcode = EX_OSERR;
1756
goto end;
1757
}
1758
/* Need to check if the handler is SIG_IGN before handling:
1759
| [[info:libc:Initial Signal Actions]] |
1760
| [[info:libc:Basic Signal Handling]] |
1761
*/
1762
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1763
if(ret == -1){
1764
perror_plus("sigaction");
1765
return EX_OSERR;
1766
}
1767
if(old_sigterm_action.sa_handler != SIG_IGN){
1768
ret = sigaction(SIGINT, &sigterm_action, NULL);
1769
if(ret == -1){
1770
perror_plus("sigaction");
1771
exitcode = EX_OSERR;
1772
goto end;
1773
}
1774
}
1775
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1776
if(ret == -1){
1777
perror_plus("sigaction");
1778
return EX_OSERR;
1779
}
1780
if(old_sigterm_action.sa_handler != SIG_IGN){
1781
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1782
if(ret == -1){
1783
perror_plus("sigaction");
1784
exitcode = EX_OSERR;
1785
goto end;
1786
}
1787
}
1788
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1789
if(ret == -1){
1790
perror_plus("sigaction");
1791
return EX_OSERR;
1792
}
1793
if(old_sigterm_action.sa_handler != SIG_IGN){
1794
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1795
if(ret == -1){
1796
perror_plus("sigaction");
1797
exitcode = EX_OSERR;
1798
goto end;
1799
}
1800
}
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
}
1801
1059
1802
1060
/* If the interface is down, bring it up */
1803
if(strcmp(interface, "none") != 0){
1804
if_index = (AvahiIfIndex) if_nametoindex(interface);
1805
if(if_index == 0){
1806
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1807
exitcode = EX_UNAVAILABLE;
1808
goto end;
1809
}
1810
1811
if(quit_now){
1812
goto end;
1813
}
1814
1815
/* Re-raise priviliges */
1816
errno = 0;
1817
ret = seteuid(0);
1818
if(ret == -1){
1819
perror_plus("seteuid");
1820
}
1821
1061
if(interface[0] != '\0'){
1822
1062
#ifdef __linux__
1823
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1824
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1825
1065
ret = klogctl(8, NULL, 5);
1826
1066
bool restore_loglevel = true;
1827
1067
if(ret == -1){
1828
1068
restore_loglevel = false;
1829
perror_plus("klogctl");
1069
perror("klogctl");
1830
1070
}
1831
1071
#endif /* __linux__ */
1832
1072
1833
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1834
1074
if(sd < 0){
1835
perror_plus("socket");
1836
exitcode = EX_OSERR;
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1837
1077
#ifdef __linux__
1838
1078
if(restore_loglevel){
1839
1079
ret = klogctl(7, NULL, 0);
1840
1080
if(ret == -1){
1841
perror_plus("klogctl");
1081
perror("klogctl");
1842
1082
}
1843
1083
}
1844
1084
#endif /* __linux__ */
1845
/* Lower privileges */
1846
errno = 0;
1847
ret = seteuid(uid);
1848
if(ret == -1){
1849
perror_plus("seteuid");
1850
}
1851
1085
goto end;
1852
1086
}
1853
1087
strcpy(network.ifr_name, interface);
1854
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1855
1089
if(ret == -1){
1856
perror_plus("ioctl SIOCGIFFLAGS");
1090
perror("ioctl SIOCGIFFLAGS");
1857
1091
#ifdef __linux__
1858
1092
if(restore_loglevel){
1859
1093
ret = klogctl(7, NULL, 0);
1860
1094
if(ret == -1){
1861
perror_plus("klogctl");
1095
perror("klogctl");
1862
1096
}
1863
1097
}
1864
1098
#endif /* __linux__ */
1865
exitcode = EX_OSERR;
1866
/* Lower privileges */
1867
errno = 0;
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1099
exitcode = EXIT_FAILURE;
1872
1100
goto end;
1873
1101
}
1874
1102
if((network.ifr_flags & IFF_UP) == 0){
1875
1103
network.ifr_flags |= IFF_UP;
1876
take_down_interface = true;
1877
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1878
1105
if(ret == -1){
1879
take_down_interface = false;
1880
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1881
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1882
1108
#ifdef __linux__
1883
1109
if(restore_loglevel){
1884
1110
ret = klogctl(7, NULL, 0);
1885
1111
if(ret == -1){
1886
perror_plus("klogctl");
1112
perror("klogctl");
1887
1113
}
1888
1114
}
1889
1115
#endif /* __linux__ */
1890
/* Lower privileges */
1891
errno = 0;
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
1116
goto end;
1897
1117
}
1898
1118
}
1899
/* Sleep checking until interface is running.
1900
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1901
1120
for(int i=0; i < delay * 4; i++){
1902
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1903
1122
if(ret == -1){
1904
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1905
1124
} else if(network.ifr_flags & IFF_RUNNING){
1906
1125
break;
1907
1126
}
1908
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1909
1128
ret = nanosleep(&sleeptime, NULL);
1910
1129
if(ret == -1 and errno != EINTR){
1911
perror_plus("nanosleep");
1130
perror("nanosleep");
1912
1131
}
1913
1132
}
1914
if(not take_down_interface){
1915
/* We won't need the socket anymore */
1916
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1917
if(ret == -1){
1918
perror_plus("close");
1919
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1920
1136
}
1921
1137
#ifdef __linux__
1922
1138
if(restore_loglevel){
1923
1139
/* Restores kernel loglevel to default */
1924
1140
ret = klogctl(7, NULL, 0);
1925
1141
if(ret == -1){
1926
perror_plus("klogctl");
1142
perror("klogctl");
1927
1143
}
1928
1144
}
1929
1145
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
if(take_down_interface){
1933
/* Lower privileges */
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
} else {
1939
/* Lower privileges permanently */
1940
ret = setuid(uid);
1941
if(ret == -1){
1942
perror_plus("setuid");
1943
}
1944
}
1945
}
1946
1947
if(quit_now){
1948
goto end;
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");
1949
1160
}
1950
1161
1951
1162
ret = init_gnutls_global(pubkey, seckey);
1952
1163
if(ret == -1){
1953
1164
fprintf(stderr, "init_gnutls_global failed\n");
1954
exitcode = EX_UNAVAILABLE;
1165
exitcode = EXIT_FAILURE;
1955
1166
goto end;
1956
1167
} else {
1957
1168
gnutls_initialized = true;
1958
1169
}
1959
1170
1960
if(quit_now){
1961
goto end;
1962
}
1963
1964
1171
if(mkdtemp(tempdir) == NULL){
1965
perror_plus("mkdtemp");
1172
perror("mkdtemp");
1966
1173
goto end;
1967
1174
}
1968
1175
tempdir_created = true;
1969
1176
1970
if(quit_now){
1971
goto end;
1972
}
1973
1974
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1975
1178
fprintf(stderr, "init_gpgme failed\n");
1976
exitcode = EX_UNAVAILABLE;
1179
exitcode = EXIT_FAILURE;
1977
1180
goto end;
1978
1181
} else {
1979
1182
gpgme_initialized = true;
1980
1183
}
1981
1184
1982
if(quit_now){
1983
goto end;
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
}
1984
1192
}
1985
1193
1986
1194
if(connect_to != NULL){
1989
1197
char *address = strrchr(connect_to, ':');
1990
1198
if(address == NULL){
1991
1199
fprintf(stderr, "No colon in address\n");
1992
exitcode = EX_USAGE;
1993
goto end;
1994
}
1995
1996
if(quit_now){
1997
goto end;
1998
}
1999
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
2000
1203
uint16_t port;
2001
1204
errno = 0;
2002
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2003
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2004
1207
or tmpmax != (uint16_t)tmpmax){
2005
1208
fprintf(stderr, "Bad port number\n");
2006
exitcode = EX_USAGE;
2007
goto end;
2008
}
2009
2010
if(quit_now){
2011
goto end;
2012
}
2013
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
2014
1212
port = (uint16_t)tmpmax;
2015
1213
*address = '\0';
1214
address = connect_to;
2016
1215
/* Colon in address indicates IPv6 */
2017
1216
int af;
2018
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2019
1218
af = AF_INET6;
2020
/* Accept [] around IPv6 address - see RFC 5952 */
2021
if(connect_to[0] == '[' and address[-1] == ']')
2022
{
2023
connect_to++;
2024
address[-1] = '\0';
2025
}
2026
1219
} else {
2027
1220
af = AF_INET;
2028
1221
}
2029
address = connect_to;
2030
2031
if(quit_now){
2032
goto end;
2033
}
2034
2035
while(not quit_now){
2036
ret = start_mandos_communication(address, port, if_index, af);
2037
if(quit_now or ret == 0){
2038
break;
2039
}
2040
if(debug){
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2043
}
2044
sleep((int)retry_interval);
2045
}
2046
2047
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2048
1226
exitcode = EXIT_SUCCESS;
2049
1227
}
1228
goto end;
1229
}
2050
1230
2051
goto end;
2052
}
2053
2054
if(quit_now){
2055
goto end;
2056
}
2057
2058
1231
{
2059
1232
AvahiServerConfig config;
2060
1233
/* Do not publish any local Zeroconf records */
2077
1250
if(mc.server == NULL){
2078
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
2079
1252
avahi_strerror(error));
2080
exitcode = EX_UNAVAILABLE;
2081
goto end;
2082
}
2083
2084
if(quit_now){
1253
exitcode = EXIT_FAILURE;
2085
1254
goto end;
2086
1255
}
2087
1256
2092
1261
if(sb == NULL){
2093
1262
fprintf(stderr, "Failed to create service browser: %s\n",
2094
1263
avahi_strerror(avahi_server_errno(mc.server)));
2095
exitcode = EX_UNAVAILABLE;
2096
goto end;
2097
}
2098
2099
if(quit_now){
1264
exitcode = EXIT_FAILURE;
2100
1265
goto end;
2101
1266
}
2102
1267
2105
1270
if(debug){
2106
1271
fprintf(stderr, "Starting Avahi loop search\n");
2107
1272
}
2108
2109
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
(int)(retry_interval * 1000));
2111
if(debug){
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2114
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2115
1275
2116
1276
end:
2117
1277
2138
1298
if(gpgme_initialized){
2139
1299
gpgme_release(mc.ctx);
2140
1300
}
2141
2142
/* Cleans up the circular linked list of Mandos servers the client
2143
has seen */
2144
if(mc.current_server != NULL){
2145
mc.current_server->prev->next = NULL;
2146
while(mc.current_server != NULL){
2147
server *next = mc.current_server->next;
2148
free(mc.current_server);
2149
mc.current_server = next;
2150
}
2151
}
2152
2153
/* XXX run network hooks "stop" here */
2154
2155
/* Take down the network interface */
2156
if(take_down_interface){
2157
/* Re-raise priviliges */
2158
errno = 0;
2159
ret = seteuid(0);
2160
if(ret == -1){
2161
perror_plus("seteuid");
2162
}
2163
if(geteuid() == 0){
2164
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
if(ret == -1){
2166
perror_plus("ioctl SIOCGIFFLAGS");
2167
} else if(network.ifr_flags & IFF_UP) {
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
if(ret == -1){
2171
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2172
}
2173
}
2174
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2175
if(ret == -1){
2176
perror_plus("close");
2177
}
2178
/* Lower privileges permanently */
2179
errno = 0;
2180
ret = setuid(uid);
2181
if(ret == -1){
2182
perror_plus("setuid");
2183
}
2184
}
2185
}
2186
2187
/* Removes the GPGME temp directory and all files inside */
1301
1302
/* Removes the temp directory used by GPGME */
2188
1303
if(tempdir_created){
2189
struct dirent **direntries = NULL;
2190
struct dirent *direntry = NULL;
2191
int numentries = scandir(tempdir, &direntries, notdotentries,
2192
alphasort);
2193
if (numentries > 0){
2194
for(int i = 0; i < numentries; i++){
2195
direntry = direntries[i];
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
}
2196
1324
char *fullname = NULL;
2197
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
2198
1326
direntry->d_name);
2199
1327
if(ret < 0){
2200
perror_plus("asprintf");
1328
perror("asprintf");
2201
1329
continue;
2202
1330
}
2203
1331
ret = remove(fullname);
2207
1335
}
2208
1336
free(fullname);
2209
1337
}
2210
}
2211
2212
/* need to clean even if 0 because man page doesn't specify */
2213
free(direntries);
2214
if (numentries == -1){
2215
perror_plus("scandir");
1338
closedir(d);
2216
1339
}
2217
1340
ret = rmdir(tempdir);
2218
1341
if(ret == -1 and errno != ENOENT){
2219
perror_plus("rmdir");
2220
}
2221
}
2222
2223
if(quit_now){
2224
sigemptyset(&old_sigterm_action.sa_mask);
2225
old_sigterm_action.sa_handler = SIG_DFL;
2226
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2227
&old_sigterm_action,
2228
NULL));
2229
if(ret == -1){
2230
perror_plus("sigaction");
2231
}
2232
do {
2233
ret = raise(signal_received);
2234
} while(ret != 0 and errno == EINTR);
2235
if(ret != 0){
2236
perror_plus("raise");
2237
abort();
2238
}
2239
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2240
1344
}
2241
1345
2242
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0