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» Revision
237.2.87
(compared to revision 237.15.1)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-25 01:47:45 UTC
- mfrom: (255 mandos-release)
- mto: (237.4.2 mandos-pipe-ipc) (24.1.137 mandos) (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-20090225014745-8yyzt3b2q56nzk9l
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() */
127
124
bool debug = false;
128
125
static const char mandos_protocol_version[] = "1";
129
126
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
144
128
145
129
/* Used for passing in values through the Avahi callback functions */
146
130
typedef struct {
151
135
gnutls_dh_params_t dh_params;
152
136
const char *priority;
153
137
gpgme_ctx_t ctx;
154
server *current_server;
155
138
} mandos_context;
156
139
157
140
/* global context so signal handler can reach it*/
158
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
142
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
172
144
173
145
/*
174
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
187
159
return buffer_capacity;
188
160
}
189
161
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
228
162
/*
229
163
* Initialize GPGME.
230
164
*/
231
165
static bool init_gpgme(const char *seckey,
232
166
const char *pubkey, const char *tempdir){
167
int ret;
233
168
gpgme_error_t rc;
234
169
gpgme_engine_info_t engine_info;
235
170
238
173
* Helper function to insert pub and seckey to the engine keyring.
239
174
*/
240
175
bool import_key(const char *filename){
241
int ret;
242
176
int fd;
243
177
gpgme_data_t pgp_data;
244
178
245
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
246
180
if(fd == -1){
247
perror_plus("open");
181
perror("open");
248
182
return false;
249
183
}
250
184
264
198
265
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
266
200
if(ret == -1){
267
perror_plus("close");
201
perror("close");
268
202
}
269
203
gpgme_data_release(pgp_data);
270
204
return true;
283
217
return false;
284
218
}
285
219
286
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
287
221
rc = gpgme_get_engine_info(&engine_info);
288
222
if(rc != GPG_ERR_NO_ERROR){
289
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
315
249
return false;
316
250
}
317
251
318
return true;
252
return true;
319
253
}
320
254
321
255
/*
375
309
}
376
310
gpgme_recipient_t recipient;
377
311
recipient = result->recipients;
378
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
385
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
}
386
322
}
387
323
}
388
324
}
395
331
396
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
397
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
398
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
399
335
plaintext_length = -1;
400
336
goto decrypt_end;
401
337
}
406
342
(size_t)plaintext_length,
407
343
plaintext_capacity);
408
344
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
345
perror("incbuffer");
410
346
plaintext_length = -1;
411
347
goto decrypt_end;
412
348
}
419
355
break;
420
356
}
421
357
if(ret < 0){
422
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
423
359
plaintext_length = -1;
424
360
goto decrypt_end;
425
361
}
482
418
}
483
419
484
420
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
486
422
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
488
427
safer_gnutls_strerror(ret));
489
428
gnutls_global_deinit();
490
429
return -1;
537
476
static int init_gnutls_session(gnutls_session_t *session){
538
477
int ret;
539
478
/* GnuTLS session creation */
540
do {
541
ret = gnutls_init(session, GNUTLS_SERVER);
542
if(quit_now){
543
return -1;
544
}
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
546
480
if(ret != GNUTLS_E_SUCCESS){
547
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
482
safer_gnutls_strerror(ret));
550
484
551
485
{
552
486
const char *err;
553
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
555
if(quit_now){
556
gnutls_deinit(*session);
557
return -1;
558
}
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
560
488
if(ret != GNUTLS_E_SUCCESS){
561
489
fprintf(stderr, "Syntax error at: %s\n", err);
562
490
fprintf(stderr, "GnuTLS error: %s\n",
566
494
}
567
495
}
568
496
569
do {
570
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
572
if(quit_now){
573
gnutls_deinit(*session);
574
return -1;
575
}
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
577
499
if(ret != GNUTLS_E_SUCCESS){
578
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
501
safer_gnutls_strerror(ret));
582
504
}
583
505
584
506
/* ignore client certificate if any. */
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
586
509
587
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
588
511
597
520
static int start_mandos_communication(const char *ip, uint16_t port,
598
521
AvahiIfIndex if_index,
599
522
int af){
600
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
601
524
ssize_t sret;
602
525
union {
603
526
struct sockaddr_in in;
604
527
struct sockaddr_in6 in6;
605
528
} to;
606
529
char *buffer = NULL;
607
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
608
531
size_t buffer_length = 0;
609
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
610
534
size_t written;
611
int retval = -1;
535
int retval = 0;
612
536
gnutls_session_t session;
613
537
int pf; /* Protocol family */
614
538
615
errno = 0;
616
617
if(quit_now){
618
errno = EINTR;
619
return -1;
620
}
621
622
539
switch(af){
623
540
case AF_INET6:
624
541
pf = PF_INET6;
628
545
break;
629
546
default:
630
547
fprintf(stderr, "Bad address family: %d\n", af);
631
errno = EINVAL;
632
548
return -1;
633
549
}
634
550
644
560
645
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
646
562
if(tcp_sd < 0){
647
int e = errno;
648
perror_plus("socket");
649
errno = e;
650
goto mandos_end;
651
}
652
653
if(quit_now){
654
errno = EINTR;
655
goto mandos_end;
563
perror("socket");
564
return -1;
656
565
}
657
566
658
567
memset(&to, 0, sizeof(to));
659
568
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
569
to.in6.sin6_family = (uint16_t)af;
661
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
662
571
} else { /* IPv4 */
663
572
to.in.sin_family = (sa_family_t)af;
664
573
ret = inet_pton(af, ip, &to.in.sin_addr);
665
574
}
666
575
if(ret < 0 ){
667
int e = errno;
668
perror_plus("inet_pton");
669
errno = e;
670
goto mandos_end;
576
perror("inet_pton");
577
return -1;
671
578
}
672
579
if(ret == 0){
673
int e = errno;
674
580
fprintf(stderr, "Bad address: %s\n", ip);
675
errno = e;
676
goto mandos_end;
581
return -1;
677
582
}
678
583
if(af == AF_INET6){
679
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
686
591
if(if_index == AVAHI_IF_UNSPEC){
687
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
593
" without a network interface\n");
689
errno = EINVAL;
690
goto mandos_end;
594
return -1;
691
595
}
692
596
/* Set the network interface number as scope */
693
597
to.in6.sin6_scope_id = (uint32_t)if_index;
698
602
-Wunreachable-code */
699
603
}
700
604
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
705
706
605
if(debug){
707
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
607
char interface[IF_NAMESIZE];
709
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
609
perror("if_indextoname");
711
610
} else {
712
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
612
ip, interface, port);
727
626
sizeof(addrstr));
728
627
}
729
628
if(pcret == NULL){
730
perror_plus("inet_ntop");
629
perror("inet_ntop");
731
630
} else {
732
631
if(strcmp(addrstr, ip) != 0){
733
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
634
}
736
635
}
737
636
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
637
if(af == AF_INET6){
744
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
639
} else {
746
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
641
}
748
642
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
754
goto mandos_end;
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
643
perror("connect");
644
return -1;
760
645
}
761
646
762
647
const char *out = mandos_protocol_version;
766
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
652
out_size - written));
768
653
if(ret == -1){
769
int e = errno;
770
perror_plus("write");
771
errno = e;
654
perror("write");
655
retval = -1;
772
656
goto mandos_end;
773
657
}
774
658
written += (size_t)ret;
782
666
break;
783
667
}
784
668
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
789
}
790
669
}
791
670
792
671
if(debug){
793
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
794
673
}
795
674
796
if(quit_now){
797
errno = EINTR;
798
goto mandos_end;
799
}
800
801
/* Spurious warning from -Wint-to-pointer-cast */
802
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
803
676
804
if(quit_now){
805
errno = EINTR;
806
goto mandos_end;
807
}
808
809
do {
677
do{
810
678
ret = gnutls_handshake(session);
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
680
817
681
if(ret != GNUTLS_E_SUCCESS){
819
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
820
684
gnutls_perror(ret);
821
685
}
822
errno = EPROTO;
686
retval = -1;
823
687
goto mandos_end;
824
688
}
825
689
831
695
}
832
696
833
697
while(true){
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
698
buffer_capacity = incbuffer(&buffer, buffer_length,
841
699
buffer_capacity);
842
700
if(buffer_capacity == 0){
843
int e = errno;
844
perror_plus("incbuffer");
845
errno = e;
846
goto mandos_end;
847
}
848
849
if(quit_now){
850
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
851
703
goto mandos_end;
852
704
}
853
705
862
714
case GNUTLS_E_AGAIN:
863
715
break;
864
716
case GNUTLS_E_REHANDSHAKE:
865
do {
717
do{
866
718
ret = gnutls_handshake(session);
867
868
if(quit_now){
869
errno = EINTR;
870
goto mandos_end;
871
}
872
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
720
if(ret < 0){
874
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
875
722
gnutls_perror(ret);
876
errno = EPROTO;
723
retval = -1;
877
724
goto mandos_end;
878
725
}
879
726
break;
880
727
default:
881
728
fprintf(stderr, "Unknown error while reading data from"
882
729
" encrypted session with Mandos server\n");
730
retval = -1;
883
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
885
732
goto mandos_end;
886
733
}
887
734
} else {
893
740
fprintf(stderr, "Closing TLS session\n");
894
741
}
895
742
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
900
901
do {
902
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
744
909
745
if(buffer_length > 0){
910
ssize_t decrypted_buffer_size;
911
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
747
buffer_length,
913
748
&decrypted_buffer);
914
749
if(decrypted_buffer_size >= 0){
915
916
750
written = 0;
917
751
while(written < (size_t) decrypted_buffer_size){
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
923
752
ret = (int)fwrite(decrypted_buffer + written, 1,
924
753
(size_t)decrypted_buffer_size - written,
925
754
stdout);
926
755
if(ret == 0 and ferror(stdout)){
927
int e = errno;
928
756
if(debug){
929
757
fprintf(stderr, "Error writing encrypted data: %s\n",
930
758
strerror(errno));
931
759
}
932
errno = e;
933
goto mandos_end;
760
retval = -1;
761
break;
934
762
}
935
763
written += (size_t)ret;
936
764
}
937
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
938
768
}
769
} else {
770
retval = -1;
939
771
}
940
772
941
773
/* Shutdown procedure */
942
774
943
775
mandos_end:
944
{
945
int e = errno;
946
free(decrypted_buffer);
947
free(buffer);
948
if(tcp_sd >= 0){
949
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
950
}
951
if(ret == -1){
952
if(e == 0){
953
e = errno;
954
}
955
perror_plus("close");
956
}
957
gnutls_deinit(session);
958
errno = e;
959
if(quit_now){
960
errno = EINTR;
961
retval = -1;
962
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
963
780
}
781
gnutls_deinit(session);
964
782
return retval;
965
783
}
966
784
983
801
/* Called whenever a service has been resolved successfully or
984
802
timed out */
985
803
986
if(quit_now){
987
return;
988
}
989
990
804
switch(event){
991
805
default:
992
806
case AVAHI_RESOLVER_FAILURE:
1008
822
avahi_proto_to_af(proto));
1009
823
if(ret == 0){
1010
824
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1014
825
}
1015
826
}
1016
827
}
1032
843
/* Called whenever a new services becomes available on the LAN or
1033
844
is removed from the LAN */
1034
845
1035
if(quit_now){
1036
return;
1037
}
1038
1039
846
switch(event){
1040
847
default:
1041
848
case AVAHI_BROWSER_FAILURE:
1070
877
}
1071
878
}
1072
879
1073
/* Signal handler that stops main loop after SIGTERM */
1074
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){
1075
884
if(quit_now){
1076
885
return;
1077
886
}
1078
887
quit_now = 1;
1079
signal_received = sig;
1080
888
int old_errno = errno;
1081
/* set main loop to exit */
1082
889
if(mc.simple_poll != NULL){
1083
890
avahi_simple_poll_quit(mc.simple_poll);
1084
891
}
1085
892
errno = old_errno;
1086
893
}
1087
894
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
int ret;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1100
if(s < 0){
1101
perror_plus("socket");
1102
return 0;
1103
}
1104
struct ifreq ifr;
1105
strcpy(ifr.ifr_name, if_entry->d_name);
1106
ret = ioctl(s, SIOCGIFFLAGS, &ifr);
1107
if(ret == -1){
1108
if(debug){
1109
perror_plus("ioctl SIOCGIFFLAGS");
1110
}
1111
return 0;
1112
}
1113
/* Reject the loopback device */
1114
if(ifr.ifr_flags & IFF_LOOPBACK){
1115
if(debug){
1116
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1117
if_entry->d_name);
1118
}
1119
return 0;
1120
}
1121
/* Accept point-to-point devices only if connect_to is specified */
1122
if(connect_to != NULL and (ifr.ifr_flags & IFF_POINTOPOINT)){
1123
if(debug){
1124
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1125
if_entry->d_name);
1126
}
1127
return 1;
1128
}
1129
/* Otherwise, reject non-broadcast-capable devices */
1130
if(not (ifr.ifr_flags & IFF_BROADCAST)){
1131
if(debug){
1132
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1133
if_entry->d_name);
1134
}
1135
return 0;
1136
}
1137
/* Reject non-ARP interfaces (including dummy interfaces) */
1138
if(ifr.ifr_flags & IFF_NOARP){
1139
if(debug){
1140
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1141
if_entry->d_name);
1142
}
1143
return 0;
1144
}
1145
/* Accept this device */
1146
if(debug){
1147
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1148
if_entry->d_name);
1149
}
1150
return 1;
1151
}
1152
1153
int notdotentries(const struct dirent *direntry){
1154
/* Skip "." and ".." */
1155
if(direntry->d_name[0] == '.'
1156
and (direntry->d_name[1] == '\0'
1157
or (direntry->d_name[1] == '.'
1158
and direntry->d_name[2] == '\0'))){
1159
return 0;
1160
}
1161
return 1;
1162
}
1163
1164
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1165
int ret;
1166
struct timespec now;
1167
struct timespec waited_time;
1168
intmax_t block_time;
1169
1170
while(true){
1171
if(mc.current_server == NULL){
1172
if (debug){
1173
fprintf(stderr,
1174
"Wait until first server is found. No timeout!\n");
1175
}
1176
ret = avahi_simple_poll_iterate(s, -1);
1177
} else {
1178
if (debug){
1179
fprintf(stderr, "Check current_server if we should run it,"
1180
" or wait\n");
1181
}
1182
/* the current time */
1183
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1184
if(ret == -1){
1185
perror_plus("clock_gettime");
1186
return -1;
1187
}
1188
/* Calculating in ms how long time between now and server
1189
who we visted longest time ago. Now - last seen. */
1190
waited_time.tv_sec = (now.tv_sec
1191
- mc.current_server->last_seen.tv_sec);
1192
waited_time.tv_nsec = (now.tv_nsec
1193
- mc.current_server->last_seen.tv_nsec);
1194
/* total time is 10s/10,000ms.
1195
Converting to s from ms by dividing by 1,000,
1196
and ns to ms by dividing by 1,000,000. */
1197
block_time = ((retry_interval
1198
- ((intmax_t)waited_time.tv_sec * 1000))
1199
- ((intmax_t)waited_time.tv_nsec / 1000000));
1200
1201
if (debug){
1202
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1203
}
1204
1205
if(block_time <= 0){
1206
ret = start_mandos_communication(mc.current_server->ip,
1207
mc.current_server->port,
1208
mc.current_server->if_index,
1209
mc.current_server->af);
1210
if(ret == 0){
1211
avahi_simple_poll_quit(mc.simple_poll);
1212
return 0;
1213
}
1214
ret = clock_gettime(CLOCK_MONOTONIC,
1215
&mc.current_server->last_seen);
1216
if(ret == -1){
1217
perror_plus("clock_gettime");
1218
return -1;
1219
}
1220
mc.current_server = mc.current_server->next;
1221
block_time = 0; /* Call avahi to find new Mandos
1222
servers, but don't block */
1223
}
1224
1225
ret = avahi_simple_poll_iterate(s, (int)block_time);
1226
}
1227
if(ret != 0){
1228
if (ret > 0 or errno != EINTR) {
1229
return (ret != 1) ? ret : 0;
1230
}
1231
}
1232
}
1233
}
1234
1235
895
int main(int argc, char *argv[]){
1236
896
AvahiSServiceBrowser *sb = NULL;
1237
897
int error;
1239
899
intmax_t tmpmax;
1240
900
char *tmp;
1241
901
int exitcode = EXIT_SUCCESS;
1242
const char *interface = "";
902
const char *interface = "eth0";
1243
903
struct ifreq network;
1244
int sd = -1;
1245
bool take_down_interface = false;
904
int sd;
1246
905
uid_t uid;
1247
906
gid_t gid;
907
char *connect_to = NULL;
1248
908
char tempdir[] = "/tmp/mandosXXXXXX";
1249
909
bool tempdir_created = false;
1250
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1254
914
bool gnutls_initialized = false;
1255
915
bool gpgme_initialized = false;
1256
916
float delay = 2.5f;
1257
double retry_interval = 10; /* 10s between trying a server and
1258
retrying the same server again */
1259
917
1260
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1261
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1262
920
1263
uid = getuid();
1264
gid = getgid();
1265
1266
/* Lower any group privileges we might have, just to be safe */
1267
errno = 0;
1268
ret = setgid(gid);
1269
if(ret == -1){
1270
perror_plus("setgid");
1271
}
1272
1273
/* Lower user privileges (temporarily) */
1274
errno = 0;
1275
ret = seteuid(uid);
1276
if(ret == -1){
1277
perror_plus("seteuid");
1278
}
1279
1280
if(quit_now){
1281
goto end;
1282
}
1283
1284
921
{
1285
922
struct argp_option options[] = {
1286
923
{ .name = "debug", .key = 128,
1315
952
.arg = "SECONDS",
1316
953
.doc = "Maximum delay to wait for interface startup",
1317
954
.group = 2 },
1318
{ .name = "retry", .key = 132,
1319
.arg = "SECONDS",
1320
.doc = "Retry interval used when denied by the mandos server",
1321
.group = 2 },
1322
/*
1323
* These reproduce what we would get without ARGP_NO_HELP
1324
*/
1325
{ .name = "help", .key = '?',
1326
.doc = "Give this help list", .group = -1 },
1327
{ .name = "usage", .key = -3,
1328
.doc = "Give a short usage message", .group = -1 },
1329
{ .name = "version", .key = 'V',
1330
.doc = "Print program version", .group = -1 },
1331
955
{ .name = NULL }
1332
956
};
1333
957
1334
958
error_t parse_opt(int key, char *arg,
1335
959
struct argp_state *state){
1336
errno = 0;
1337
960
switch(key){
1338
961
case 128: /* --debug */
1339
962
debug = true;
1355
978
tmpmax = strtoimax(arg, &tmp, 10);
1356
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1357
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1358
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1359
983
}
1360
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1361
985
break;
1366
990
errno = 0;
1367
991
delay = strtof(arg, &tmp);
1368
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1369
argp_error(state, "Bad delay");
1370
}
1371
case 132: /* --retry */
1372
errno = 0;
1373
retry_interval = strtod(arg, &tmp);
1374
if(errno != 0 or tmp == arg or *tmp != '\0'
1375
or (retry_interval * 1000) > INT_MAX
1376
or retry_interval < 0){
1377
argp_error(state, "Bad retry interval");
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
1378
995
}
1379
996
break;
1380
/*
1381
* These reproduce what we would get without ARGP_NO_HELP
1382
*/
1383
case '?': /* --help */
1384
argp_state_help(state, state->out_stream,
1385
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1386
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1387
case -3: /* --usage */
1388
argp_state_help(state, state->out_stream,
1389
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1390
case 'V': /* --version */
1391
fprintf(state->out_stream, "%s\n", argp_program_version);
1392
exit(argp_err_exit_status);
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1393
1000
break;
1394
1001
default:
1395
1002
return ARGP_ERR_UNKNOWN;
1396
1003
}
1397
return errno;
1004
return 0;
1398
1005
}
1399
1006
1400
1007
struct argp argp = { .options = options, .parser = parse_opt,
1401
1008
.args_doc = "",
1402
1009
.doc = "Mandos client -- Get and decrypt"
1403
1010
" passwords from a Mandos server" };
1404
ret = argp_parse(&argp, argc, argv,
1405
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1406
switch(ret){
1407
case 0:
1408
break;
1409
case ENOMEM:
1410
default:
1411
errno = ret;
1412
perror_plus("argp_parse");
1413
exitcode = EX_OSERR;
1414
goto end;
1415
case EINVAL:
1416
exitcode = EX_USAGE;
1417
goto end;
1418
}
1419
}
1420
1421
{
1422
/* Work around Debian bug #633582:
1423
<http://bugs.debian.org/633582> */
1424
struct stat st;
1425
1426
/* Re-raise priviliges */
1427
errno = 0;
1428
ret = seteuid(0);
1429
if(ret == -1){
1430
perror_plus("seteuid");
1431
}
1432
1433
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1434
int seckey_fd = open(seckey, O_RDONLY);
1435
if(seckey_fd == -1){
1436
perror_plus("open");
1437
} else {
1438
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1439
if(ret == -1){
1440
perror_plus("fstat");
1441
} else {
1442
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1443
ret = fchown(seckey_fd, uid, gid);
1444
if(ret == -1){
1445
perror_plus("fchown");
1446
}
1447
}
1448
}
1449
TEMP_FAILURE_RETRY(close(seckey_fd));
1450
}
1451
}
1452
1453
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1454
int pubkey_fd = open(pubkey, O_RDONLY);
1455
if(pubkey_fd == -1){
1456
perror_plus("open");
1457
} else {
1458
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1459
if(ret == -1){
1460
perror_plus("fstat");
1461
} else {
1462
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1463
ret = fchown(pubkey_fd, uid, gid);
1464
if(ret == -1){
1465
perror_plus("fchown");
1466
}
1467
}
1468
}
1469
TEMP_FAILURE_RETRY(close(pubkey_fd));
1470
}
1471
}
1472
1473
/* Lower privileges */
1474
errno = 0;
1475
ret = seteuid(uid);
1476
if(ret == -1){
1477
perror_plus("seteuid");
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;
1478
1016
}
1479
1017
}
1480
1018
1481
1019
if(not debug){
1482
1020
avahi_set_log_function(empty_log);
1483
1021
}
1484
1485
if(interface[0] == '\0'){
1486
struct dirent **direntries;
1487
ret = scandir(sys_class_net, &direntries, good_interface,
1488
alphasort);
1489
if(ret >= 1){
1490
/* Pick the first good interface */
1491
interface = strdup(direntries[0]->d_name);
1492
if(debug){
1493
fprintf(stderr, "Using interface \"%s\"\n", interface);
1494
}
1495
if(interface == NULL){
1496
perror_plus("malloc");
1497
free(direntries);
1498
exitcode = EXIT_FAILURE;
1499
goto end;
1500
}
1501
free(direntries);
1502
} else {
1503
free(direntries);
1504
fprintf(stderr, "Could not find a network interface\n");
1505
exitcode = EXIT_FAILURE;
1506
goto end;
1507
}
1508
}
1509
1022
1510
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1511
1024
from the signal handler */
1514
1027
mc.simple_poll = avahi_simple_poll_new();
1515
1028
if(mc.simple_poll == NULL){
1516
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1517
exitcode = EX_UNAVAILABLE;
1030
exitcode = EXIT_FAILURE;
1518
1031
goto end;
1519
1032
}
1520
1033
1521
1034
sigemptyset(&sigterm_action.sa_mask);
1522
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1523
1036
if(ret == -1){
1524
perror_plus("sigaddset");
1525
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1526
1039
goto end;
1527
1040
}
1528
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1529
1042
if(ret == -1){
1530
perror_plus("sigaddset");
1531
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1532
1045
goto end;
1533
1046
}
1534
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1535
1048
if(ret == -1){
1536
perror_plus("sigaddset");
1537
exitcode = EX_OSERR;
1538
goto end;
1539
}
1540
/* Need to check if the handler is SIG_IGN before handling:
1541
| [[info:libc:Initial Signal Actions]] |
1542
| [[info:libc:Basic Signal Handling]] |
1543
*/
1544
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1545
if(ret == -1){
1546
perror_plus("sigaction");
1547
return EX_OSERR;
1548
}
1549
if(old_sigterm_action.sa_handler != SIG_IGN){
1550
ret = sigaction(SIGINT, &sigterm_action, NULL);
1551
if(ret == -1){
1552
perror_plus("sigaction");
1553
exitcode = EX_OSERR;
1554
goto end;
1555
}
1556
}
1557
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1558
if(ret == -1){
1559
perror_plus("sigaction");
1560
return EX_OSERR;
1561
}
1562
if(old_sigterm_action.sa_handler != SIG_IGN){
1563
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1564
if(ret == -1){
1565
perror_plus("sigaction");
1566
exitcode = EX_OSERR;
1567
goto end;
1568
}
1569
}
1570
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1571
if(ret == -1){
1572
perror_plus("sigaction");
1573
return EX_OSERR;
1574
}
1575
if(old_sigterm_action.sa_handler != SIG_IGN){
1576
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1577
if(ret == -1){
1578
perror_plus("sigaction");
1579
exitcode = EX_OSERR;
1580
goto end;
1581
}
1582
}
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
}
1583
1059
1584
1060
/* If the interface is down, bring it up */
1585
if(strcmp(interface, "none") != 0){
1586
if_index = (AvahiIfIndex) if_nametoindex(interface);
1587
if(if_index == 0){
1588
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1589
exitcode = EX_UNAVAILABLE;
1590
goto end;
1591
}
1592
1593
if(quit_now){
1594
goto end;
1595
}
1596
1597
/* Re-raise priviliges */
1598
errno = 0;
1599
ret = seteuid(0);
1600
if(ret == -1){
1601
perror_plus("seteuid");
1602
}
1603
1061
if(interface[0] != '\0'){
1604
1062
#ifdef __linux__
1605
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1606
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1607
1065
ret = klogctl(8, NULL, 5);
1608
1066
bool restore_loglevel = true;
1609
1067
if(ret == -1){
1610
1068
restore_loglevel = false;
1611
perror_plus("klogctl");
1069
perror("klogctl");
1612
1070
}
1613
1071
#endif /* __linux__ */
1614
1072
1615
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1616
1074
if(sd < 0){
1617
perror_plus("socket");
1618
exitcode = EX_OSERR;
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1619
1077
#ifdef __linux__
1620
1078
if(restore_loglevel){
1621
1079
ret = klogctl(7, NULL, 0);
1622
1080
if(ret == -1){
1623
perror_plus("klogctl");
1081
perror("klogctl");
1624
1082
}
1625
1083
}
1626
1084
#endif /* __linux__ */
1627
/* Lower privileges */
1628
errno = 0;
1629
ret = seteuid(uid);
1630
if(ret == -1){
1631
perror_plus("seteuid");
1632
}
1633
1085
goto end;
1634
1086
}
1635
1087
strcpy(network.ifr_name, interface);
1636
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1637
1089
if(ret == -1){
1638
perror_plus("ioctl SIOCGIFFLAGS");
1090
perror("ioctl SIOCGIFFLAGS");
1639
1091
#ifdef __linux__
1640
1092
if(restore_loglevel){
1641
1093
ret = klogctl(7, NULL, 0);
1642
1094
if(ret == -1){
1643
perror_plus("klogctl");
1095
perror("klogctl");
1644
1096
}
1645
1097
}
1646
1098
#endif /* __linux__ */
1647
exitcode = EX_OSERR;
1648
/* Lower privileges */
1649
errno = 0;
1650
ret = seteuid(uid);
1651
if(ret == -1){
1652
perror_plus("seteuid");
1653
}
1099
exitcode = EXIT_FAILURE;
1654
1100
goto end;
1655
1101
}
1656
1102
if((network.ifr_flags & IFF_UP) == 0){
1657
1103
network.ifr_flags |= IFF_UP;
1658
take_down_interface = true;
1659
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1660
1105
if(ret == -1){
1661
take_down_interface = false;
1662
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1663
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1664
1108
#ifdef __linux__
1665
1109
if(restore_loglevel){
1666
1110
ret = klogctl(7, NULL, 0);
1667
1111
if(ret == -1){
1668
perror_plus("klogctl");
1112
perror("klogctl");
1669
1113
}
1670
1114
}
1671
1115
#endif /* __linux__ */
1672
/* Lower privileges */
1673
errno = 0;
1674
ret = seteuid(uid);
1675
if(ret == -1){
1676
perror_plus("seteuid");
1677
}
1678
1116
goto end;
1679
1117
}
1680
1118
}
1681
/* Sleep checking until interface is running.
1682
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1683
1120
for(int i=0; i < delay * 4; i++){
1684
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1685
1122
if(ret == -1){
1686
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1687
1124
} else if(network.ifr_flags & IFF_RUNNING){
1688
1125
break;
1689
1126
}
1690
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1691
1128
ret = nanosleep(&sleeptime, NULL);
1692
1129
if(ret == -1 and errno != EINTR){
1693
perror_plus("nanosleep");
1130
perror("nanosleep");
1694
1131
}
1695
1132
}
1696
if(not take_down_interface){
1697
/* We won't need the socket anymore */
1698
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1699
if(ret == -1){
1700
perror_plus("close");
1701
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1702
1136
}
1703
1137
#ifdef __linux__
1704
1138
if(restore_loglevel){
1705
1139
/* Restores kernel loglevel to default */
1706
1140
ret = klogctl(7, NULL, 0);
1707
1141
if(ret == -1){
1708
perror_plus("klogctl");
1142
perror("klogctl");
1709
1143
}
1710
1144
}
1711
1145
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
if(take_down_interface){
1715
/* Lower privileges */
1716
ret = seteuid(uid);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
}
1720
} else {
1721
/* Lower privileges permanently */
1722
ret = setuid(uid);
1723
if(ret == -1){
1724
perror_plus("setuid");
1725
}
1726
}
1727
}
1728
1729
if(quit_now){
1730
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");
1731
1160
}
1732
1161
1733
1162
ret = init_gnutls_global(pubkey, seckey);
1734
1163
if(ret == -1){
1735
1164
fprintf(stderr, "init_gnutls_global failed\n");
1736
exitcode = EX_UNAVAILABLE;
1165
exitcode = EXIT_FAILURE;
1737
1166
goto end;
1738
1167
} else {
1739
1168
gnutls_initialized = true;
1740
1169
}
1741
1170
1742
if(quit_now){
1743
goto end;
1744
}
1745
1746
1171
if(mkdtemp(tempdir) == NULL){
1747
perror_plus("mkdtemp");
1172
perror("mkdtemp");
1748
1173
goto end;
1749
1174
}
1750
1175
tempdir_created = true;
1751
1176
1752
if(quit_now){
1753
goto end;
1754
}
1755
1756
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1757
1178
fprintf(stderr, "init_gpgme failed\n");
1758
exitcode = EX_UNAVAILABLE;
1179
exitcode = EXIT_FAILURE;
1759
1180
goto end;
1760
1181
} else {
1761
1182
gpgme_initialized = true;
1762
1183
}
1763
1184
1764
if(quit_now){
1765
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
}
1766
1192
}
1767
1193
1768
1194
if(connect_to != NULL){
1771
1197
char *address = strrchr(connect_to, ':');
1772
1198
if(address == NULL){
1773
1199
fprintf(stderr, "No colon in address\n");
1774
exitcode = EX_USAGE;
1775
goto end;
1776
}
1777
1778
if(quit_now){
1779
goto end;
1780
}
1781
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1782
1203
uint16_t port;
1783
1204
errno = 0;
1784
1205
tmpmax = strtoimax(address+1, &tmp, 10);
1785
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1786
1207
or tmpmax != (uint16_t)tmpmax){
1787
1208
fprintf(stderr, "Bad port number\n");
1788
exitcode = EX_USAGE;
1789
goto end;
1790
}
1791
1792
if(quit_now){
1793
goto end;
1794
}
1795
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1796
1212
port = (uint16_t)tmpmax;
1797
1213
*address = '\0';
1214
address = connect_to;
1798
1215
/* Colon in address indicates IPv6 */
1799
1216
int af;
1800
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
1801
1218
af = AF_INET6;
1802
/* Accept [] around IPv6 address - see RFC 5952 */
1803
if(connect_to[0] == '[' and address[-1] == ']')
1804
{
1805
connect_to++;
1806
address[-1] = '\0';
1807
}
1808
1219
} else {
1809
1220
af = AF_INET;
1810
1221
}
1811
address = connect_to;
1812
1813
if(quit_now){
1814
goto end;
1815
}
1816
1817
while(not quit_now){
1818
ret = start_mandos_communication(address, port, if_index, af);
1819
if(quit_now or ret == 0){
1820
break;
1821
}
1822
if(debug){
1823
fprintf(stderr, "Retrying in %d seconds\n",
1824
(int)retry_interval);
1825
}
1826
sleep((int)retry_interval);
1827
}
1828
1829
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
1830
1226
exitcode = EXIT_SUCCESS;
1831
1227
}
1832
1833
goto end;
1834
}
1835
1836
if(quit_now){
1837
goto end;
1838
}
1839
1228
goto end;
1229
}
1230
1840
1231
{
1841
1232
AvahiServerConfig config;
1842
1233
/* Do not publish any local Zeroconf records */
1859
1250
if(mc.server == NULL){
1860
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1861
1252
avahi_strerror(error));
1862
exitcode = EX_UNAVAILABLE;
1863
goto end;
1864
}
1865
1866
if(quit_now){
1253
exitcode = EXIT_FAILURE;
1867
1254
goto end;
1868
1255
}
1869
1256
1874
1261
if(sb == NULL){
1875
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1876
1263
avahi_strerror(avahi_server_errno(mc.server)));
1877
exitcode = EX_UNAVAILABLE;
1878
goto end;
1879
}
1880
1881
if(quit_now){
1264
exitcode = EXIT_FAILURE;
1882
1265
goto end;
1883
1266
}
1884
1267
1887
1270
if(debug){
1888
1271
fprintf(stderr, "Starting Avahi loop search\n");
1889
1272
}
1890
1891
ret = avahi_loop_with_timeout(mc.simple_poll,
1892
(int)(retry_interval * 1000));
1893
if(debug){
1894
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1895
(ret == 0) ? "successfully" : "with error");
1896
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
1897
1275
1898
1276
end:
1899
1277
1920
1298
if(gpgme_initialized){
1921
1299
gpgme_release(mc.ctx);
1922
1300
}
1923
1924
/* Cleans up the circular linked list of Mandos servers the client
1925
has seen */
1926
if(mc.current_server != NULL){
1927
mc.current_server->prev->next = NULL;
1928
while(mc.current_server != NULL){
1929
server *next = mc.current_server->next;
1930
free(mc.current_server);
1931
mc.current_server = next;
1932
}
1933
}
1934
1935
/* Take down the network interface */
1936
if(take_down_interface){
1937
/* Re-raise priviliges */
1938
errno = 0;
1939
ret = seteuid(0);
1940
if(ret == -1){
1941
perror_plus("seteuid");
1942
}
1943
if(geteuid() == 0){
1944
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1945
if(ret == -1){
1946
perror_plus("ioctl SIOCGIFFLAGS");
1947
} else if(network.ifr_flags & IFF_UP) {
1948
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1949
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1950
if(ret == -1){
1951
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1952
}
1953
}
1954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1955
if(ret == -1){
1956
perror_plus("close");
1957
}
1958
/* Lower privileges permanently */
1959
errno = 0;
1960
ret = setuid(uid);
1961
if(ret == -1){
1962
perror_plus("setuid");
1963
}
1964
}
1965
}
1966
1967
/* Removes the GPGME temp directory and all files inside */
1301
1302
/* Removes the temp directory used by GPGME */
1968
1303
if(tempdir_created){
1969
struct dirent **direntries = NULL;
1970
struct dirent *direntry = NULL;
1971
int numentries = scandir(tempdir, &direntries, notdotentries,
1972
alphasort);
1973
if (numentries > 0){
1974
for(int i = 0; i < numentries; i++){
1975
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
}
1976
1324
char *fullname = NULL;
1977
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1978
1326
direntry->d_name);
1979
1327
if(ret < 0){
1980
perror_plus("asprintf");
1328
perror("asprintf");
1981
1329
continue;
1982
1330
}
1983
1331
ret = remove(fullname);
1987
1335
}
1988
1336
free(fullname);
1989
1337
}
1990
}
1991
1992
/* need to clean even if 0 because man page doesn't specify */
1993
free(direntries);
1994
if (numentries == -1){
1995
perror_plus("scandir");
1338
closedir(d);
1996
1339
}
1997
1340
ret = rmdir(tempdir);
1998
1341
if(ret == -1 and errno != ENOENT){
1999
perror_plus("rmdir");
2000
}
2001
}
2002
2003
if(quit_now){
2004
sigemptyset(&old_sigterm_action.sa_mask);
2005
old_sigterm_action.sa_handler = SIG_DFL;
2006
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2007
&old_sigterm_action,
2008
NULL));
2009
if(ret == -1){
2010
perror_plus("sigaction");
2011
}
2012
do {
2013
ret = raise(signal_received);
2014
} while(ret != 0 and errno == EINTR);
2015
if(ret != 0){
2016
perror_plus("raise");
2017
abort();
2018
}
2019
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2020
1344
}
2021
1345
2022
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0