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- Committer: Teddy Hogeborn
- Date: 2009-02-13 09:03:22 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 316.
- Revision ID: teddy@fukt.bsnet.se-20090213090322-6ixytwlkdsm637d7
Tags: version-1.0.6-1
* Makefile (version): Changed to "1.0.6".
NEWS (Version 1.0.6): New entry.
debian/changelog (1.0.6-1): - '' -
NEWS (Version 1.0.6): New entry.
debian/changelog (1.0.6-1): - '' -
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
43
39
stdout, ferror(), remove() */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
48
44
#include <stdbool.h> /* bool, false, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
62
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
59
strtoimax() */
64
60
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
78
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
88
81
89
82
#ifdef __linux__
90
83
#include <sys/klog.h> /* klogctl() */
127
120
bool debug = false;
128
121
static const char mandos_protocol_version[] = "1";
129
122
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;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
144
124
145
125
/* Used for passing in values through the Avahi callback functions */
146
126
typedef struct {
151
131
gnutls_dh_params_t dh_params;
152
132
const char *priority;
153
133
gpgme_ctx_t ctx;
154
server *current_server;
155
134
} mandos_context;
156
135
157
136
/* global context so signal handler can reach it*/
158
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
138
.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
}
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
172
140
173
141
/*
174
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
187
155
return buffer_capacity;
188
156
}
189
157
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
158
/*
229
159
* Initialize GPGME.
230
160
*/
231
161
static bool init_gpgme(const char *seckey,
232
162
const char *pubkey, const char *tempdir){
163
int ret;
233
164
gpgme_error_t rc;
234
165
gpgme_engine_info_t engine_info;
235
166
238
169
* Helper function to insert pub and seckey to the engine keyring.
239
170
*/
240
171
bool import_key(const char *filename){
241
int ret;
242
172
int fd;
243
173
gpgme_data_t pgp_data;
244
174
245
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
246
176
if(fd == -1){
247
perror_plus("open");
177
perror("open");
248
178
return false;
249
179
}
250
180
264
194
265
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
266
196
if(ret == -1){
267
perror_plus("close");
197
perror("close");
268
198
}
269
199
gpgme_data_release(pgp_data);
270
200
return true;
283
213
return false;
284
214
}
285
215
286
/* Set GPGME home directory for the OpenPGP engine only */
216
/* Set GPGME home directory for the OpenPGP engine only */
287
217
rc = gpgme_get_engine_info(&engine_info);
288
218
if(rc != GPG_ERR_NO_ERROR){
289
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
315
245
return false;
316
246
}
317
247
318
return true;
248
return true;
319
249
}
320
250
321
251
/*
375
305
}
376
306
gpgme_recipient_t recipient;
377
307
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;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
386
318
}
387
319
}
388
320
}
395
327
396
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
397
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
398
perror_plus("gpgme_data_seek");
330
perror("gpgme_data_seek");
399
331
plaintext_length = -1;
400
332
goto decrypt_end;
401
333
}
406
338
(size_t)plaintext_length,
407
339
plaintext_capacity);
408
340
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
341
perror("incbuffer");
410
342
plaintext_length = -1;
411
343
goto decrypt_end;
412
344
}
419
351
break;
420
352
}
421
353
if(ret < 0){
422
perror_plus("gpgme_data_read");
354
perror("gpgme_data_read");
423
355
plaintext_length = -1;
424
356
goto decrypt_end;
425
357
}
482
414
}
483
415
484
416
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
417
gnutls_certificate_allocate_credentials(&mc.cred);
486
418
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
488
423
safer_gnutls_strerror(ret));
489
424
gnutls_global_deinit();
490
425
return -1;
537
472
static int init_gnutls_session(gnutls_session_t *session){
538
473
int ret;
539
474
/* 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);
475
ret = gnutls_init(session, GNUTLS_SERVER);
546
476
if(ret != GNUTLS_E_SUCCESS){
547
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
478
safer_gnutls_strerror(ret));
550
480
551
481
{
552
482
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);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
560
484
if(ret != GNUTLS_E_SUCCESS){
561
485
fprintf(stderr, "Syntax error at: %s\n", err);
562
486
fprintf(stderr, "GnuTLS error: %s\n",
566
490
}
567
491
}
568
492
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);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
577
495
if(ret != GNUTLS_E_SUCCESS){
578
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
497
safer_gnutls_strerror(ret));
582
500
}
583
501
584
502
/* ignore client certificate if any. */
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
586
505
587
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
588
507
597
516
static int start_mandos_communication(const char *ip, uint16_t port,
598
517
AvahiIfIndex if_index,
599
518
int af){
600
int ret, tcp_sd = -1;
519
int ret, tcp_sd;
601
520
ssize_t sret;
602
521
union {
603
522
struct sockaddr_in in;
604
523
struct sockaddr_in6 in6;
605
524
} to;
606
525
char *buffer = NULL;
607
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
608
527
size_t buffer_length = 0;
609
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
610
530
size_t written;
611
int retval = -1;
531
int retval = 0;
612
532
gnutls_session_t session;
613
533
int pf; /* Protocol family */
614
534
615
errno = 0;
616
617
if(quit_now){
618
errno = EINTR;
619
return -1;
620
}
621
622
535
switch(af){
623
536
case AF_INET6:
624
537
pf = PF_INET6;
628
541
break;
629
542
default:
630
543
fprintf(stderr, "Bad address family: %d\n", af);
631
errno = EINVAL;
632
544
return -1;
633
545
}
634
546
644
556
645
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
646
558
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;
559
perror("socket");
560
return -1;
656
561
}
657
562
658
563
memset(&to, 0, sizeof(to));
659
564
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
661
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
662
567
} else { /* IPv4 */
663
568
to.in.sin_family = (sa_family_t)af;
664
569
ret = inet_pton(af, ip, &to.in.sin_addr);
665
570
}
666
571
if(ret < 0 ){
667
int e = errno;
668
perror_plus("inet_pton");
669
errno = e;
670
goto mandos_end;
572
perror("inet_pton");
573
return -1;
671
574
}
672
575
if(ret == 0){
673
int e = errno;
674
576
fprintf(stderr, "Bad address: %s\n", ip);
675
errno = e;
676
goto mandos_end;
577
return -1;
677
578
}
678
579
if(af == AF_INET6){
679
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
686
587
if(if_index == AVAHI_IF_UNSPEC){
687
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
589
" without a network interface\n");
689
errno = EINVAL;
690
goto mandos_end;
590
return -1;
691
591
}
692
592
/* Set the network interface number as scope */
693
593
to.in6.sin6_scope_id = (uint32_t)if_index;
698
598
-Wunreachable-code */
699
599
}
700
600
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
705
706
601
if(debug){
707
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
603
char interface[IF_NAMESIZE];
709
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
605
perror("if_indextoname");
711
606
} else {
712
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
608
ip, interface, port);
727
622
sizeof(addrstr));
728
623
}
729
624
if(pcret == NULL){
730
perror_plus("inet_ntop");
625
perror("inet_ntop");
731
626
} else {
732
627
if(strcmp(addrstr, ip) != 0){
733
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
630
}
736
631
}
737
632
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
633
if(af == AF_INET6){
744
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
635
} else {
746
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
637
}
748
638
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;
639
perror("connect");
640
return -1;
760
641
}
761
642
762
643
const char *out = mandos_protocol_version;
766
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
648
out_size - written));
768
649
if(ret == -1){
769
int e = errno;
770
perror_plus("write");
771
errno = e;
650
perror("write");
651
retval = -1;
772
652
goto mandos_end;
773
653
}
774
654
written += (size_t)ret;
782
662
break;
783
663
}
784
664
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
789
}
790
665
}
791
666
792
667
if(debug){
793
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
794
669
}
795
670
796
if(quit_now){
797
errno = EINTR;
798
goto mandos_end;
799
}
800
801
/* Spurious warning from -Wint-to-pointer-cast */
802
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
803
672
804
if(quit_now){
805
errno = EINTR;
806
goto mandos_end;
807
}
808
809
do {
673
do{
810
674
ret = gnutls_handshake(session);
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
676
817
677
if(ret != GNUTLS_E_SUCCESS){
819
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
820
680
gnutls_perror(ret);
821
681
}
822
errno = EPROTO;
682
retval = -1;
823
683
goto mandos_end;
824
684
}
825
685
831
691
}
832
692
833
693
while(true){
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
694
buffer_capacity = incbuffer(&buffer, buffer_length,
841
695
buffer_capacity);
842
696
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;
697
perror("incbuffer");
698
retval = -1;
851
699
goto mandos_end;
852
700
}
853
701
862
710
case GNUTLS_E_AGAIN:
863
711
break;
864
712
case GNUTLS_E_REHANDSHAKE:
865
do {
713
do{
866
714
ret = gnutls_handshake(session);
867
868
if(quit_now){
869
errno = EINTR;
870
goto mandos_end;
871
}
872
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
716
if(ret < 0){
874
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
875
718
gnutls_perror(ret);
876
errno = EPROTO;
719
retval = -1;
877
720
goto mandos_end;
878
721
}
879
722
break;
880
723
default:
881
724
fprintf(stderr, "Unknown error while reading data from"
882
725
" encrypted session with Mandos server\n");
726
retval = -1;
883
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
885
728
goto mandos_end;
886
729
}
887
730
} else {
893
736
fprintf(stderr, "Closing TLS session\n");
894
737
}
895
738
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);
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
740
909
741
if(buffer_length > 0){
910
ssize_t decrypted_buffer_size;
911
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
743
buffer_length,
913
744
&decrypted_buffer);
914
745
if(decrypted_buffer_size >= 0){
915
916
746
written = 0;
917
747
while(written < (size_t) decrypted_buffer_size){
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
923
748
ret = (int)fwrite(decrypted_buffer + written, 1,
924
749
(size_t)decrypted_buffer_size - written,
925
750
stdout);
926
751
if(ret == 0 and ferror(stdout)){
927
int e = errno;
928
752
if(debug){
929
753
fprintf(stderr, "Error writing encrypted data: %s\n",
930
754
strerror(errno));
931
755
}
932
errno = e;
933
goto mandos_end;
756
retval = -1;
757
break;
934
758
}
935
759
written += (size_t)ret;
936
760
}
937
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
938
764
}
765
} else {
766
retval = -1;
939
767
}
940
768
941
769
/* Shutdown procedure */
942
770
943
771
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
}
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
963
776
}
777
gnutls_deinit(session);
964
778
return retval;
965
779
}
966
780
983
797
/* Called whenever a service has been resolved successfully or
984
798
timed out */
985
799
986
if(quit_now){
987
return;
988
}
989
990
800
switch(event){
991
801
default:
992
802
case AVAHI_RESOLVER_FAILURE:
1008
818
avahi_proto_to_af(proto));
1009
819
if(ret == 0){
1010
820
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1014
821
}
1015
822
}
1016
823
}
1032
839
/* Called whenever a new services becomes available on the LAN or
1033
840
is removed from the LAN */
1034
841
1035
if(quit_now){
1036
return;
1037
}
1038
1039
842
switch(event){
1040
843
default:
1041
844
case AVAHI_BROWSER_FAILURE:
1070
873
}
1071
874
}
1072
875
1073
/* Signal handler that stops main loop after SIGTERM */
1074
static void handle_sigterm(int sig){
876
sig_atomic_t quit_now = 0;
877
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
1075
880
if(quit_now){
1076
881
return;
1077
882
}
1078
883
quit_now = 1;
1079
signal_received = sig;
1080
884
int old_errno = errno;
1081
/* set main loop to exit */
1082
885
if(mc.simple_poll != NULL){
1083
886
avahi_simple_poll_quit(mc.simple_poll);
1084
887
}
1085
888
errno = old_errno;
1086
889
}
1087
890
1088
bool get_flags(const char *ifname, struct ifreq *ifr){
1089
int ret;
1090
1091
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1092
if(s < 0){
1093
perror_plus("socket");
1094
return false;
1095
}
1096
strcpy(ifr->ifr_name, ifname);
1097
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1098
if(ret == -1){
1099
if(debug){
1100
perror_plus("ioctl SIOCGIFFLAGS");
1101
}
1102
return false;
1103
}
1104
return true;
1105
}
1106
1107
bool good_flags(const char *ifname, const struct ifreq *ifr){
1108
1109
/* Reject the loopback device */
1110
if(ifr->ifr_flags & IFF_LOOPBACK){
1111
if(debug){
1112
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1113
ifname);
1114
}
1115
return false;
1116
}
1117
/* Accept point-to-point devices only if connect_to is specified */
1118
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1119
if(debug){
1120
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1121
ifname);
1122
}
1123
return true;
1124
}
1125
/* Otherwise, reject non-broadcast-capable devices */
1126
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1127
if(debug){
1128
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1129
ifname);
1130
}
1131
return false;
1132
}
1133
/* Reject non-ARP interfaces (including dummy interfaces) */
1134
if(ifr->ifr_flags & IFF_NOARP){
1135
if(debug){
1136
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1137
}
1138
return false;
1139
}
1140
1141
/* Accept this device */
1142
if(debug){
1143
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1144
}
1145
return true;
1146
}
1147
1148
/*
1149
* This function determines if a directory entry in /sys/class/net
1150
* corresponds to an acceptable network device.
1151
* (This function is passed to scandir(3) as a filter function.)
1152
*/
1153
int good_interface(const struct dirent *if_entry){
1154
int ret;
1155
if(if_entry->d_name[0] == '.'){
1156
return 0;
1157
}
1158
struct ifreq ifr;
1159
1160
if(not get_flags(if_entry->d_name, &ifr)){
1161
return 0;
1162
}
1163
1164
if(not good_flags(if_entry->d_name, &ifr)){
1165
return 0;
1166
}
1167
return 1;
1168
}
1169
1170
int notdotentries(const struct dirent *direntry){
1171
/* Skip "." and ".." */
1172
if(direntry->d_name[0] == '.'
1173
and (direntry->d_name[1] == '\0'
1174
or (direntry->d_name[1] == '.'
1175
and direntry->d_name[2] == '\0'))){
1176
return 0;
1177
}
1178
return 1;
1179
}
1180
1181
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1182
int ret;
1183
struct timespec now;
1184
struct timespec waited_time;
1185
intmax_t block_time;
1186
1187
while(true){
1188
if(mc.current_server == NULL){
1189
if (debug){
1190
fprintf(stderr,
1191
"Wait until first server is found. No timeout!\n");
1192
}
1193
ret = avahi_simple_poll_iterate(s, -1);
1194
} else {
1195
if (debug){
1196
fprintf(stderr, "Check current_server if we should run it,"
1197
" or wait\n");
1198
}
1199
/* the current time */
1200
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1201
if(ret == -1){
1202
perror_plus("clock_gettime");
1203
return -1;
1204
}
1205
/* Calculating in ms how long time between now and server
1206
who we visted longest time ago. Now - last seen. */
1207
waited_time.tv_sec = (now.tv_sec
1208
- mc.current_server->last_seen.tv_sec);
1209
waited_time.tv_nsec = (now.tv_nsec
1210
- mc.current_server->last_seen.tv_nsec);
1211
/* total time is 10s/10,000ms.
1212
Converting to s from ms by dividing by 1,000,
1213
and ns to ms by dividing by 1,000,000. */
1214
block_time = ((retry_interval
1215
- ((intmax_t)waited_time.tv_sec * 1000))
1216
- ((intmax_t)waited_time.tv_nsec / 1000000));
1217
1218
if (debug){
1219
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1220
}
1221
1222
if(block_time <= 0){
1223
ret = start_mandos_communication(mc.current_server->ip,
1224
mc.current_server->port,
1225
mc.current_server->if_index,
1226
mc.current_server->af);
1227
if(ret == 0){
1228
avahi_simple_poll_quit(mc.simple_poll);
1229
return 0;
1230
}
1231
ret = clock_gettime(CLOCK_MONOTONIC,
1232
&mc.current_server->last_seen);
1233
if(ret == -1){
1234
perror_plus("clock_gettime");
1235
return -1;
1236
}
1237
mc.current_server = mc.current_server->next;
1238
block_time = 0; /* Call avahi to find new Mandos
1239
servers, but don't block */
1240
}
1241
1242
ret = avahi_simple_poll_iterate(s, (int)block_time);
1243
}
1244
if(ret != 0){
1245
if (ret > 0 or errno != EINTR) {
1246
return (ret != 1) ? ret : 0;
1247
}
1248
}
1249
}
1250
}
1251
1252
891
int main(int argc, char *argv[]){
1253
892
AvahiSServiceBrowser *sb = NULL;
1254
893
int error;
1256
895
intmax_t tmpmax;
1257
896
char *tmp;
1258
897
int exitcode = EXIT_SUCCESS;
1259
const char *interface = "";
898
const char *interface = "eth0";
1260
899
struct ifreq network;
1261
int sd = -1;
1262
bool take_down_interface = false;
900
int sd;
1263
901
uid_t uid;
1264
902
gid_t gid;
903
char *connect_to = NULL;
1265
904
char tempdir[] = "/tmp/mandosXXXXXX";
1266
905
bool tempdir_created = false;
1267
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1271
910
bool gnutls_initialized = false;
1272
911
bool gpgme_initialized = false;
1273
912
float delay = 2.5f;
1274
double retry_interval = 10; /* 10s between trying a server and
1275
retrying the same server again */
1276
913
1277
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
914
struct sigaction old_sigterm_action;
1278
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1279
916
1280
uid = getuid();
1281
gid = getgid();
1282
1283
/* Lower any group privileges we might have, just to be safe */
1284
errno = 0;
1285
ret = setgid(gid);
1286
if(ret == -1){
1287
perror_plus("setgid");
1288
}
1289
1290
/* Lower user privileges (temporarily) */
1291
errno = 0;
1292
ret = seteuid(uid);
1293
if(ret == -1){
1294
perror_plus("seteuid");
1295
}
1296
1297
if(quit_now){
1298
goto end;
1299
}
1300
1301
917
{
1302
918
struct argp_option options[] = {
1303
919
{ .name = "debug", .key = 128,
1332
948
.arg = "SECONDS",
1333
949
.doc = "Maximum delay to wait for interface startup",
1334
950
.group = 2 },
1335
{ .name = "retry", .key = 132,
1336
.arg = "SECONDS",
1337
.doc = "Retry interval used when denied by the mandos server",
1338
.group = 2 },
1339
/*
1340
* These reproduce what we would get without ARGP_NO_HELP
1341
*/
1342
{ .name = "help", .key = '?',
1343
.doc = "Give this help list", .group = -1 },
1344
{ .name = "usage", .key = -3,
1345
.doc = "Give a short usage message", .group = -1 },
1346
{ .name = "version", .key = 'V',
1347
.doc = "Print program version", .group = -1 },
1348
951
{ .name = NULL }
1349
952
};
1350
953
1351
954
error_t parse_opt(int key, char *arg,
1352
955
struct argp_state *state){
1353
errno = 0;
1354
956
switch(key){
1355
957
case 128: /* --debug */
1356
958
debug = true;
1372
974
tmpmax = strtoimax(arg, &tmp, 10);
1373
975
if(errno != 0 or tmp == arg or *tmp != '\0'
1374
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1375
argp_error(state, "Bad number of DH bits");
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
1376
979
}
1377
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1378
981
break;
1383
986
errno = 0;
1384
987
delay = strtof(arg, &tmp);
1385
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
1386
argp_error(state, "Bad delay");
1387
}
1388
case 132: /* --retry */
1389
errno = 0;
1390
retry_interval = strtod(arg, &tmp);
1391
if(errno != 0 or tmp == arg or *tmp != '\0'
1392
or (retry_interval * 1000) > INT_MAX
1393
or retry_interval < 0){
1394
argp_error(state, "Bad retry interval");
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
1395
991
}
1396
992
break;
1397
/*
1398
* These reproduce what we would get without ARGP_NO_HELP
1399
*/
1400
case '?': /* --help */
1401
argp_state_help(state, state->out_stream,
1402
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1403
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1404
case -3: /* --usage */
1405
argp_state_help(state, state->out_stream,
1406
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1407
case 'V': /* --version */
1408
fprintf(state->out_stream, "%s\n", argp_program_version);
1409
exit(argp_err_exit_status);
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
1410
996
break;
1411
997
default:
1412
998
return ARGP_ERR_UNKNOWN;
1413
999
}
1414
return errno;
1000
return 0;
1415
1001
}
1416
1002
1417
1003
struct argp argp = { .options = options, .parser = parse_opt,
1418
1004
.args_doc = "",
1419
1005
.doc = "Mandos client -- Get and decrypt"
1420
1006
" passwords from a Mandos server" };
1421
ret = argp_parse(&argp, argc, argv,
1422
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1423
switch(ret){
1424
case 0:
1425
break;
1426
case ENOMEM:
1427
default:
1428
errno = ret;
1429
perror_plus("argp_parse");
1430
exitcode = EX_OSERR;
1431
goto end;
1432
case EINVAL:
1433
exitcode = EX_USAGE;
1434
goto end;
1435
}
1436
}
1437
1438
{
1439
/* Work around Debian bug #633582:
1440
<http://bugs.debian.org/633582> */
1441
struct stat st;
1442
1443
/* Re-raise priviliges */
1444
errno = 0;
1445
ret = seteuid(0);
1446
if(ret == -1){
1447
perror_plus("seteuid");
1448
}
1449
1450
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1451
int seckey_fd = open(seckey, O_RDONLY);
1452
if(seckey_fd == -1){
1453
perror_plus("open");
1454
} else {
1455
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1456
if(ret == -1){
1457
perror_plus("fstat");
1458
} else {
1459
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1460
ret = fchown(seckey_fd, uid, gid);
1461
if(ret == -1){
1462
perror_plus("fchown");
1463
}
1464
}
1465
}
1466
TEMP_FAILURE_RETRY(close(seckey_fd));
1467
}
1468
}
1469
1470
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1471
int pubkey_fd = open(pubkey, O_RDONLY);
1472
if(pubkey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(pubkey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(pubkey_fd));
1487
}
1488
}
1489
1490
/* Lower privileges */
1491
errno = 0;
1492
ret = seteuid(uid);
1493
if(ret == -1){
1494
perror_plus("seteuid");
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1495
1012
}
1496
1013
}
1497
1014
1498
1015
if(not debug){
1499
1016
avahi_set_log_function(empty_log);
1500
1017
}
1501
1502
if(interface[0] == '\0'){
1503
struct dirent **direntries;
1504
ret = scandir(sys_class_net, &direntries, good_interface,
1505
alphasort);
1506
if(ret >= 1){
1507
/* Pick the first good interface */
1508
interface = strdup(direntries[0]->d_name);
1509
if(debug){
1510
fprintf(stderr, "Using interface \"%s\"\n", interface);
1511
}
1512
if(interface == NULL){
1513
perror_plus("malloc");
1514
free(direntries);
1515
exitcode = EXIT_FAILURE;
1516
goto end;
1517
}
1518
free(direntries);
1519
} else {
1520
free(direntries);
1521
fprintf(stderr, "Could not find a network interface\n");
1522
exitcode = EXIT_FAILURE;
1523
goto end;
1524
}
1525
}
1526
1018
1527
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1528
1020
from the signal handler */
1531
1023
mc.simple_poll = avahi_simple_poll_new();
1532
1024
if(mc.simple_poll == NULL){
1533
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1534
exitcode = EX_UNAVAILABLE;
1026
exitcode = EXIT_FAILURE;
1535
1027
goto end;
1536
1028
}
1537
1029
1538
1030
sigemptyset(&sigterm_action.sa_mask);
1539
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1540
1032
if(ret == -1){
1541
perror_plus("sigaddset");
1542
exitcode = EX_OSERR;
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1543
1035
goto end;
1544
1036
}
1545
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1546
1038
if(ret == -1){
1547
perror_plus("sigaddset");
1548
exitcode = EX_OSERR;
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1549
1041
goto end;
1550
1042
}
1551
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1552
1044
if(ret == -1){
1553
perror_plus("sigaddset");
1554
exitcode = EX_OSERR;
1555
goto end;
1556
}
1557
/* Need to check if the handler is SIG_IGN before handling:
1558
| [[info:libc:Initial Signal Actions]] |
1559
| [[info:libc:Basic Signal Handling]] |
1560
*/
1561
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1562
if(ret == -1){
1563
perror_plus("sigaction");
1564
return EX_OSERR;
1565
}
1566
if(old_sigterm_action.sa_handler != SIG_IGN){
1567
ret = sigaction(SIGINT, &sigterm_action, NULL);
1568
if(ret == -1){
1569
perror_plus("sigaction");
1570
exitcode = EX_OSERR;
1571
goto end;
1572
}
1573
}
1574
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1575
if(ret == -1){
1576
perror_plus("sigaction");
1577
return EX_OSERR;
1578
}
1579
if(old_sigterm_action.sa_handler != SIG_IGN){
1580
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1581
if(ret == -1){
1582
perror_plus("sigaction");
1583
exitcode = EX_OSERR;
1584
goto end;
1585
}
1586
}
1587
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1588
if(ret == -1){
1589
perror_plus("sigaction");
1590
return EX_OSERR;
1591
}
1592
if(old_sigterm_action.sa_handler != SIG_IGN){
1593
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1594
if(ret == -1){
1595
perror_plus("sigaction");
1596
exitcode = EX_OSERR;
1597
goto end;
1598
}
1599
}
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
1600
1055
1601
1056
/* If the interface is down, bring it up */
1602
if(strcmp(interface, "none") != 0){
1603
if_index = (AvahiIfIndex) if_nametoindex(interface);
1604
if(if_index == 0){
1605
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1606
exitcode = EX_UNAVAILABLE;
1607
goto end;
1608
}
1609
1610
if(quit_now){
1611
goto end;
1612
}
1613
1614
/* Re-raise priviliges */
1615
errno = 0;
1616
ret = seteuid(0);
1617
if(ret == -1){
1618
perror_plus("seteuid");
1619
}
1620
1057
if(interface[0] != '\0'){
1621
1058
#ifdef __linux__
1622
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1060
messages to mess up the prompt */
1624
1061
ret = klogctl(8, NULL, 5);
1625
1062
bool restore_loglevel = true;
1626
1063
if(ret == -1){
1627
1064
restore_loglevel = false;
1628
perror_plus("klogctl");
1065
perror("klogctl");
1629
1066
}
1630
1067
#endif /* __linux__ */
1631
1068
1632
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1633
1070
if(sd < 0){
1634
perror_plus("socket");
1635
exitcode = EX_OSERR;
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1636
1073
#ifdef __linux__
1637
1074
if(restore_loglevel){
1638
1075
ret = klogctl(7, NULL, 0);
1639
1076
if(ret == -1){
1640
perror_plus("klogctl");
1077
perror("klogctl");
1641
1078
}
1642
1079
}
1643
1080
#endif /* __linux__ */
1644
/* Lower privileges */
1645
errno = 0;
1646
ret = seteuid(uid);
1647
if(ret == -1){
1648
perror_plus("seteuid");
1649
}
1650
1081
goto end;
1651
1082
}
1652
1083
strcpy(network.ifr_name, interface);
1653
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1654
1085
if(ret == -1){
1655
perror_plus("ioctl SIOCGIFFLAGS");
1086
perror("ioctl SIOCGIFFLAGS");
1656
1087
#ifdef __linux__
1657
1088
if(restore_loglevel){
1658
1089
ret = klogctl(7, NULL, 0);
1659
1090
if(ret == -1){
1660
perror_plus("klogctl");
1091
perror("klogctl");
1661
1092
}
1662
1093
}
1663
1094
#endif /* __linux__ */
1664
exitcode = EX_OSERR;
1665
/* Lower privileges */
1666
errno = 0;
1667
ret = seteuid(uid);
1668
if(ret == -1){
1669
perror_plus("seteuid");
1670
}
1095
exitcode = EXIT_FAILURE;
1671
1096
goto end;
1672
1097
}
1673
1098
if((network.ifr_flags & IFF_UP) == 0){
1674
1099
network.ifr_flags |= IFF_UP;
1675
take_down_interface = true;
1676
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1677
1101
if(ret == -1){
1678
take_down_interface = false;
1679
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1680
exitcode = EX_OSERR;
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1681
1104
#ifdef __linux__
1682
1105
if(restore_loglevel){
1683
1106
ret = klogctl(7, NULL, 0);
1684
1107
if(ret == -1){
1685
perror_plus("klogctl");
1108
perror("klogctl");
1686
1109
}
1687
1110
}
1688
1111
#endif /* __linux__ */
1689
/* Lower privileges */
1690
errno = 0;
1691
ret = seteuid(uid);
1692
if(ret == -1){
1693
perror_plus("seteuid");
1694
}
1695
1112
goto end;
1696
1113
}
1697
1114
}
1698
/* Sleep checking until interface is running.
1699
Check every 0.25s, up to total time of delay */
1115
/* sleep checking until interface is running */
1700
1116
for(int i=0; i < delay * 4; i++){
1701
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1702
1118
if(ret == -1){
1703
perror_plus("ioctl SIOCGIFFLAGS");
1119
perror("ioctl SIOCGIFFLAGS");
1704
1120
} else if(network.ifr_flags & IFF_RUNNING){
1705
1121
break;
1706
1122
}
1707
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1708
1124
ret = nanosleep(&sleeptime, NULL);
1709
1125
if(ret == -1 and errno != EINTR){
1710
perror_plus("nanosleep");
1126
perror("nanosleep");
1711
1127
}
1712
1128
}
1713
if(not take_down_interface){
1714
/* We won't need the socket anymore */
1715
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1716
if(ret == -1){
1717
perror_plus("close");
1718
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
1719
1132
}
1720
1133
#ifdef __linux__
1721
1134
if(restore_loglevel){
1722
1135
/* Restores kernel loglevel to default */
1723
1136
ret = klogctl(7, NULL, 0);
1724
1137
if(ret == -1){
1725
perror_plus("klogctl");
1138
perror("klogctl");
1726
1139
}
1727
1140
}
1728
1141
#endif /* __linux__ */
1729
/* Lower privileges */
1730
errno = 0;
1731
if(take_down_interface){
1732
/* Lower privileges */
1733
ret = seteuid(uid);
1734
if(ret == -1){
1735
perror_plus("seteuid");
1736
}
1737
} else {
1738
/* Lower privileges permanently */
1739
ret = setuid(uid);
1740
if(ret == -1){
1741
perror_plus("setuid");
1742
}
1743
}
1744
}
1745
1746
if(quit_now){
1747
goto end;
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
1748
1156
}
1749
1157
1750
1158
ret = init_gnutls_global(pubkey, seckey);
1751
1159
if(ret == -1){
1752
1160
fprintf(stderr, "init_gnutls_global failed\n");
1753
exitcode = EX_UNAVAILABLE;
1161
exitcode = EXIT_FAILURE;
1754
1162
goto end;
1755
1163
} else {
1756
1164
gnutls_initialized = true;
1757
1165
}
1758
1166
1759
if(quit_now){
1760
goto end;
1761
}
1762
1763
1167
if(mkdtemp(tempdir) == NULL){
1764
perror_plus("mkdtemp");
1168
perror("mkdtemp");
1765
1169
goto end;
1766
1170
}
1767
1171
tempdir_created = true;
1768
1172
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
1774
1174
fprintf(stderr, "init_gpgme failed\n");
1775
exitcode = EX_UNAVAILABLE;
1175
exitcode = EXIT_FAILURE;
1776
1176
goto end;
1777
1177
} else {
1778
1178
gpgme_initialized = true;
1779
1179
}
1780
1180
1781
if(quit_now){
1782
goto end;
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1183
if(if_index == 0){
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1783
1188
}
1784
1189
1785
1190
if(connect_to != NULL){
1788
1193
char *address = strrchr(connect_to, ':');
1789
1194
if(address == NULL){
1790
1195
fprintf(stderr, "No colon in address\n");
1791
exitcode = EX_USAGE;
1792
goto end;
1793
}
1794
1795
if(quit_now){
1796
goto end;
1797
}
1798
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1799
1199
uint16_t port;
1800
1200
errno = 0;
1801
1201
tmpmax = strtoimax(address+1, &tmp, 10);
1802
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1803
1203
or tmpmax != (uint16_t)tmpmax){
1804
1204
fprintf(stderr, "Bad port number\n");
1805
exitcode = EX_USAGE;
1806
goto end;
1807
}
1808
1809
if(quit_now){
1810
goto end;
1811
}
1812
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
1813
1208
port = (uint16_t)tmpmax;
1814
1209
*address = '\0';
1210
address = connect_to;
1815
1211
/* Colon in address indicates IPv6 */
1816
1212
int af;
1817
if(strchr(connect_to, ':') != NULL){
1213
if(strchr(address, ':') != NULL){
1818
1214
af = AF_INET6;
1819
/* Accept [] around IPv6 address - see RFC 5952 */
1820
if(connect_to[0] == '[' and address[-1] == ']')
1821
{
1822
connect_to++;
1823
address[-1] = '\0';
1824
}
1825
1215
} else {
1826
1216
af = AF_INET;
1827
1217
}
1828
address = connect_to;
1829
1830
if(quit_now){
1831
goto end;
1832
}
1833
1834
while(not quit_now){
1835
ret = start_mandos_communication(address, port, if_index, af);
1836
if(quit_now or ret == 0){
1837
break;
1838
}
1839
if(debug){
1840
fprintf(stderr, "Retrying in %d seconds\n",
1841
(int)retry_interval);
1842
}
1843
sleep((int)retry_interval);
1844
}
1845
1846
if (not quit_now){
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
1847
1222
exitcode = EXIT_SUCCESS;
1848
1223
}
1849
1850
goto end;
1851
}
1852
1853
if(quit_now){
1854
goto end;
1855
}
1856
1224
goto end;
1225
}
1226
1857
1227
{
1858
1228
AvahiServerConfig config;
1859
1229
/* Do not publish any local Zeroconf records */
1876
1246
if(mc.server == NULL){
1877
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
1878
1248
avahi_strerror(error));
1879
exitcode = EX_UNAVAILABLE;
1880
goto end;
1881
}
1882
1883
if(quit_now){
1249
exitcode = EXIT_FAILURE;
1884
1250
goto end;
1885
1251
}
1886
1252
1891
1257
if(sb == NULL){
1892
1258
fprintf(stderr, "Failed to create service browser: %s\n",
1893
1259
avahi_strerror(avahi_server_errno(mc.server)));
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1260
exitcode = EXIT_FAILURE;
1899
1261
goto end;
1900
1262
}
1901
1263
1904
1266
if(debug){
1905
1267
fprintf(stderr, "Starting Avahi loop search\n");
1906
1268
}
1907
1908
ret = avahi_loop_with_timeout(mc.simple_poll,
1909
(int)(retry_interval * 1000));
1910
if(debug){
1911
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1912
(ret == 0) ? "successfully" : "with error");
1913
}
1269
1270
avahi_simple_poll_loop(mc.simple_poll);
1914
1271
1915
1272
end:
1916
1273
1937
1294
if(gpgme_initialized){
1938
1295
gpgme_release(mc.ctx);
1939
1296
}
1940
1941
/* Cleans up the circular linked list of Mandos servers the client
1942
has seen */
1943
if(mc.current_server != NULL){
1944
mc.current_server->prev->next = NULL;
1945
while(mc.current_server != NULL){
1946
server *next = mc.current_server->next;
1947
free(mc.current_server);
1948
mc.current_server = next;
1949
}
1950
}
1951
1952
/* Take down the network interface */
1953
if(take_down_interface){
1954
/* Re-raise priviliges */
1955
errno = 0;
1956
ret = seteuid(0);
1957
if(ret == -1){
1958
perror_plus("seteuid");
1959
}
1960
if(geteuid() == 0){
1961
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1962
if(ret == -1){
1963
perror_plus("ioctl SIOCGIFFLAGS");
1964
} else if(network.ifr_flags & IFF_UP) {
1965
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1966
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1967
if(ret == -1){
1968
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1969
}
1970
}
1971
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1972
if(ret == -1){
1973
perror_plus("close");
1974
}
1975
/* Lower privileges permanently */
1976
errno = 0;
1977
ret = setuid(uid);
1978
if(ret == -1){
1979
perror_plus("setuid");
1980
}
1981
}
1982
}
1983
1984
/* Removes the GPGME temp directory and all files inside */
1297
1298
/* Removes the temp directory used by GPGME */
1985
1299
if(tempdir_created){
1986
struct dirent **direntries = NULL;
1987
struct dirent *direntry = NULL;
1988
int numentries = scandir(tempdir, &direntries, notdotentries,
1989
alphasort);
1990
if (numentries > 0){
1991
for(int i = 0; i < numentries; i++){
1992
direntry = direntries[i];
1300
DIR *d;
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1303
if(d == NULL){
1304
if(errno != ENOENT){
1305
perror("opendir");
1306
}
1307
} else {
1308
while(true){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1311
break;
1312
}
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
continue;
1319
}
1993
1320
char *fullname = NULL;
1994
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
1995
1322
direntry->d_name);
1996
1323
if(ret < 0){
1997
perror_plus("asprintf");
1324
perror("asprintf");
1998
1325
continue;
1999
1326
}
2000
1327
ret = remove(fullname);
2004
1331
}
2005
1332
free(fullname);
2006
1333
}
2007
}
2008
2009
/* need to clean even if 0 because man page doesn't specify */
2010
free(direntries);
2011
if (numentries == -1){
2012
perror_plus("scandir");
1334
closedir(d);
2013
1335
}
2014
1336
ret = rmdir(tempdir);
2015
1337
if(ret == -1 and errno != ENOENT){
2016
perror_plus("rmdir");
2017
}
2018
}
2019
2020
if(quit_now){
2021
sigemptyset(&old_sigterm_action.sa_mask);
2022
old_sigterm_action.sa_handler = SIG_DFL;
2023
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2024
&old_sigterm_action,
2025
NULL));
2026
if(ret == -1){
2027
perror_plus("sigaction");
2028
}
2029
do {
2030
ret = raise(signal_received);
2031
} while(ret != 0 and errno == EINTR);
2032
if(ret != 0){
2033
perror_plus("raise");
2034
abort();
2035
}
2036
TEMP_FAILURE_RETRY(pause());
1338
perror("rmdir");
1339
}
2037
1340
}
2038
1341
2039
1342
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0