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- Committer: Teddy Hogeborn
- Date: 2009-02-12 06:09:24 UTC
- Revision ID: teddy@fukt.bsnet.se-20090212060924-vwxgitxnwr14w9e4
* mandos (Client.start_checker): Bug fix: Add extra check in case the
checker process completed quickly.
checker process completed quickly.
- 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
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
59
56
#include <fcntl.h> /* open() */
60
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
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:
1051
854
the callback function is called the Avahi server will free the
1052
855
resolver for us. */
1053
856
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
1057
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
862
name, avahi_strerror(avahi_server_errno(mc.server)));
1059
863
break;
1070
874
}
1071
875
}
1072
876
1073
/* Signal handler that stops main loop after SIGTERM */
1074
static void handle_sigterm(int sig){
877
sig_atomic_t quit_now = 0;
878
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
1075
881
if(quit_now){
1076
882
return;
1077
883
}
1078
884
quit_now = 1;
1079
signal_received = sig;
1080
885
int old_errno = errno;
1081
/* set main loop to exit */
1082
886
if(mc.simple_poll != NULL){
1083
887
avahi_simple_poll_quit(mc.simple_poll);
1084
888
}
1085
889
errno = old_errno;
1086
890
}
1087
891
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
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1189
}
1190
return 1;
1191
}
1192
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1199
return 0;
1200
}
1201
return 1;
1202
}
1203
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
int ret;
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1209
1210
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1215
}
1216
ret = avahi_simple_poll_iterate(s, -1);
1217
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1221
}
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
if(ret == -1){
1225
perror_plus("clock_gettime");
1226
return -1;
1227
}
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1232
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1234
/* total time is 10s/10,000ms.
1235
Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1243
}
1244
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1250
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1252
return 0;
1253
}
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1256
if(ret == -1){
1257
perror_plus("clock_gettime");
1258
return -1;
1259
}
1260
mc.current_server = mc.current_server->next;
1261
block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
1263
}
1264
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
}
1267
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
1270
}
1271
}
1272
}
1273
}
1274
1275
892
int main(int argc, char *argv[]){
1276
893
AvahiSServiceBrowser *sb = NULL;
1277
894
int error;
1278
895
int ret;
1279
896
intmax_t tmpmax;
1280
char *tmp;
897
int numchars;
1281
898
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
899
const char *interface = "eth0";
1283
900
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
901
int sd;
1286
902
uid_t uid;
1287
903
gid_t gid;
904
char *connect_to = NULL;
1288
905
char tempdir[] = "/tmp/mandosXXXXXX";
1289
906
bool tempdir_created = false;
1290
907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
908
const char *seckey = PATHDIR "/" SECKEY;
1292
909
const char *pubkey = PATHDIR "/" PUBKEY;
1293
910
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1294
915
bool gnutls_initialized = false;
1295
916
bool gpgme_initialized = false;
1296
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1299
1300
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
917
double delay = 2.5;
918
919
struct sigaction old_sigterm_action;
1301
920
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1302
921
1303
uid = getuid();
1304
gid = getgid();
1305
1306
/* Lower any group privileges we might have, just to be safe */
1307
errno = 0;
1308
ret = setgid(gid);
1309
if(ret == -1){
1310
perror_plus("setgid");
1311
}
1312
1313
/* Lower user privileges (temporarily) */
1314
errno = 0;
1315
ret = seteuid(uid);
1316
if(ret == -1){
1317
perror_plus("seteuid");
1318
}
1319
1320
if(quit_now){
1321
goto end;
1322
}
1323
1324
922
{
1325
923
struct argp_option options[] = {
1326
924
{ .name = "debug", .key = 128,
1355
953
.arg = "SECONDS",
1356
954
.doc = "Maximum delay to wait for interface startup",
1357
955
.group = 2 },
1358
{ .name = "retry", .key = 132,
1359
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1361
.group = 2 },
1362
/*
1363
* These reproduce what we would get without ARGP_NO_HELP
1364
*/
1365
{ .name = "help", .key = '?',
1366
.doc = "Give this help list", .group = -1 },
1367
{ .name = "usage", .key = -3,
1368
.doc = "Give a short usage message", .group = -1 },
1369
{ .name = "version", .key = 'V',
1370
.doc = "Print program version", .group = -1 },
1371
956
{ .name = NULL }
1372
957
};
1373
958
1374
959
error_t parse_opt(int key, char *arg,
1375
960
struct argp_state *state){
1376
errno = 0;
1377
961
switch(key){
1378
962
case 128: /* --debug */
1379
963
debug = true;
1391
975
pubkey = arg;
1392
976
break;
1393
977
case 129: /* --dh-bits */
1394
errno = 0;
1395
tmpmax = strtoimax(arg, &tmp, 10);
1396
if(errno != 0 or tmp == arg or *tmp != '\0'
1397
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1398
argp_error(state, "Bad number of DH bits");
978
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
979
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
980
or arg[numchars] != '\0'){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1399
983
}
1400
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1401
985
break;
1403
987
mc.priority = arg;
1404
988
break;
1405
989
case 131: /* --delay */
1406
errno = 0;
1407
delay = strtof(arg, &tmp);
1408
if(errno != 0 or tmp == arg or *tmp != '\0'){
1409
argp_error(state, "Bad delay");
1410
}
1411
case 132: /* --retry */
1412
errno = 0;
1413
retry_interval = strtod(arg, &tmp);
1414
if(errno != 0 or tmp == arg or *tmp != '\0'
1415
or (retry_interval * 1000) > INT_MAX
1416
or retry_interval < 0){
1417
argp_error(state, "Bad retry interval");
990
ret = sscanf(arg, "%lf%n", &delay, &numchars);
991
if(ret < 1 or arg[numchars] != '\0'){
992
fprintf(stderr, "Bad delay\n");
993
exit(EXIT_FAILURE);
1418
994
}
1419
995
break;
1420
/*
1421
* These reproduce what we would get without ARGP_NO_HELP
1422
*/
1423
case '?': /* --help */
1424
argp_state_help(state, state->out_stream,
1425
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1426
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1427
case -3: /* --usage */
1428
argp_state_help(state, state->out_stream,
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1432
exit(argp_err_exit_status);
996
case ARGP_KEY_ARG:
997
argp_usage(state);
998
case ARGP_KEY_END:
1433
999
break;
1434
1000
default:
1435
1001
return ARGP_ERR_UNKNOWN;
1436
1002
}
1437
return errno;
1003
return 0;
1438
1004
}
1439
1005
1440
1006
struct argp argp = { .options = options, .parser = parse_opt,
1441
1007
.args_doc = "",
1442
1008
.doc = "Mandos client -- Get and decrypt"
1443
1009
" passwords from a Mandos server" };
1444
ret = argp_parse(&argp, argc, argv,
1445
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1446
switch(ret){
1447
case 0:
1448
break;
1449
case ENOMEM:
1450
default:
1451
errno = ret;
1452
perror_plus("argp_parse");
1453
exitcode = EX_OSERR;
1454
goto end;
1455
case EINVAL:
1456
exitcode = EX_USAGE;
1457
goto end;
1458
}
1459
}
1460
1461
{
1462
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1014
goto end;
1518
1015
}
1519
1016
}
1520
1017
1521
1018
if(not debug){
1522
1019
avahi_set_log_function(empty_log);
1523
1020
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
1021
1550
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
1023
from the signal handler */
1554
1026
mc.simple_poll = avahi_simple_poll_new();
1555
1027
if(mc.simple_poll == NULL){
1556
1028
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1557
exitcode = EX_UNAVAILABLE;
1029
exitcode = EXIT_FAILURE;
1558
1030
goto end;
1559
1031
}
1560
1032
1561
1033
sigemptyset(&sigterm_action.sa_mask);
1562
1034
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1563
1035
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1036
perror("sigaddset");
1037
exitcode = EXIT_FAILURE;
1566
1038
goto end;
1567
1039
}
1568
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1569
1041
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1572
1044
goto end;
1573
1045
}
1574
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1575
1047
if(ret == -1){
1576
perror_plus("sigaddset");
1577
exitcode = EX_OSERR;
1578
goto end;
1579
}
1580
/* Need to check if the handler is SIG_IGN before handling:
1581
| [[info:libc:Initial Signal Actions]] |
1582
| [[info:libc:Basic Signal Handling]] |
1583
*/
1584
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1585
if(ret == -1){
1586
perror_plus("sigaction");
1587
return EX_OSERR;
1588
}
1589
if(old_sigterm_action.sa_handler != SIG_IGN){
1590
ret = sigaction(SIGINT, &sigterm_action, NULL);
1591
if(ret == -1){
1592
perror_plus("sigaction");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
}
1596
}
1597
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1598
if(ret == -1){
1599
perror_plus("sigaction");
1600
return EX_OSERR;
1601
}
1602
if(old_sigterm_action.sa_handler != SIG_IGN){
1603
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1604
if(ret == -1){
1605
perror_plus("sigaction");
1606
exitcode = EX_OSERR;
1607
goto end;
1608
}
1609
}
1610
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1611
if(ret == -1){
1612
perror_plus("sigaction");
1613
return EX_OSERR;
1614
}
1615
if(old_sigterm_action.sa_handler != SIG_IGN){
1616
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1617
if(ret == -1){
1618
perror_plus("sigaction");
1619
exitcode = EX_OSERR;
1620
goto end;
1621
}
1622
}
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1623
1058
1624
1059
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1060
if(interface[0] != '\0'){
1644
1061
#ifdef __linux__
1645
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1063
messages to mess up the prompt */
1647
1064
ret = klogctl(8, NULL, 5);
1648
1065
bool restore_loglevel = true;
1649
1066
if(ret == -1){
1650
1067
restore_loglevel = false;
1651
perror_plus("klogctl");
1068
perror("klogctl");
1652
1069
}
1653
1070
#endif /* __linux__ */
1654
1071
1655
1072
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
1073
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1074
perror("socket");
1075
exitcode = EXIT_FAILURE;
1659
1076
#ifdef __linux__
1660
1077
if(restore_loglevel){
1661
1078
ret = klogctl(7, NULL, 0);
1662
1079
if(ret == -1){
1663
perror_plus("klogctl");
1080
perror("klogctl");
1664
1081
}
1665
1082
}
1666
1083
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
1084
goto end;
1674
1085
}
1675
1086
strcpy(network.ifr_name, interface);
1676
1087
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
1088
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1089
perror("ioctl SIOCGIFFLAGS");
1679
1090
#ifdef __linux__
1680
1091
if(restore_loglevel){
1681
1092
ret = klogctl(7, NULL, 0);
1682
1093
if(ret == -1){
1683
perror_plus("klogctl");
1094
perror("klogctl");
1684
1095
}
1685
1096
}
1686
1097
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1098
exitcode = EXIT_FAILURE;
1694
1099
goto end;
1695
1100
}
1696
1101
if((network.ifr_flags & IFF_UP) == 0){
1697
1102
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
1104
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1105
perror("ioctl SIOCSIFFLAGS");
1106
exitcode = EXIT_FAILURE;
1704
1107
#ifdef __linux__
1705
1108
if(restore_loglevel){
1706
1109
ret = klogctl(7, NULL, 0);
1707
1110
if(ret == -1){
1708
perror_plus("klogctl");
1111
perror("klogctl");
1709
1112
}
1710
1113
}
1711
1114
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
1115
goto end;
1719
1116
}
1720
1117
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1118
/* sleep checking until interface is running */
1723
1119
for(int i=0; i < delay * 4; i++){
1724
1120
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
1121
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1122
perror("ioctl SIOCGIFFLAGS");
1727
1123
} else if(network.ifr_flags & IFF_RUNNING){
1728
1124
break;
1729
1125
}
1730
1126
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
1127
ret = nanosleep(&sleeptime, NULL);
1732
1128
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1129
perror("nanosleep");
1734
1130
}
1735
1131
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1133
if(ret == -1){
1134
perror("close");
1742
1135
}
1743
1136
#ifdef __linux__
1744
1137
if(restore_loglevel){
1745
1138
/* Restores kernel loglevel to default */
1746
1139
ret = klogctl(7, NULL, 0);
1747
1140
if(ret == -1){
1748
perror_plus("klogctl");
1141
perror("klogctl");
1749
1142
}
1750
1143
}
1751
1144
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
1767
}
1768
1769
if(quit_now){
1770
goto end;
1145
}
1146
1147
uid = getuid();
1148
gid = getgid();
1149
1150
errno = 0;
1151
setgid(gid);
1152
if(ret == -1){
1153
perror("setgid");
1154
}
1155
1156
ret = setuid(uid);
1157
if(ret == -1){
1158
perror("setuid");
1771
1159
}
1772
1160
1773
1161
ret = init_gnutls_global(pubkey, seckey);
1774
1162
if(ret == -1){
1775
1163
fprintf(stderr, "init_gnutls_global failed\n");
1776
exitcode = EX_UNAVAILABLE;
1164
exitcode = EXIT_FAILURE;
1777
1165
goto end;
1778
1166
} else {
1779
1167
gnutls_initialized = true;
1780
1168
}
1781
1169
1782
if(quit_now){
1783
goto end;
1784
}
1785
1786
1170
if(mkdtemp(tempdir) == NULL){
1787
perror_plus("mkdtemp");
1171
perror("mkdtemp");
1788
1172
goto end;
1789
1173
}
1790
1174
tempdir_created = true;
1791
1175
1792
if(quit_now){
1793
goto end;
1794
}
1795
1796
1176
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
1177
fprintf(stderr, "init_gpgme failed\n");
1798
exitcode = EX_UNAVAILABLE;
1178
exitcode = EXIT_FAILURE;
1799
1179
goto end;
1800
1180
} else {
1801
1181
gpgme_initialized = true;
1802
1182
}
1803
1183
1804
if(quit_now){
1805
goto end;
1184
if(interface[0] != '\0'){
1185
if_index = (AvahiIfIndex) if_nametoindex(interface);
1186
if(if_index == 0){
1187
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1188
exitcode = EXIT_FAILURE;
1189
goto end;
1190
}
1806
1191
}
1807
1192
1808
1193
if(connect_to != NULL){
1811
1196
char *address = strrchr(connect_to, ':');
1812
1197
if(address == NULL){
1813
1198
fprintf(stderr, "No colon in address\n");
1814
exitcode = EX_USAGE;
1815
goto end;
1816
}
1817
1818
if(quit_now){
1819
goto end;
1820
}
1821
1199
exitcode = EXIT_FAILURE;
1200
goto end;
1201
}
1822
1202
uint16_t port;
1823
errno = 0;
1824
tmpmax = strtoimax(address+1, &tmp, 10);
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1203
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1204
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1205
or address[numchars+1] != '\0'){
1827
1206
fprintf(stderr, "Bad port number\n");
1828
exitcode = EX_USAGE;
1829
goto end;
1830
}
1831
1832
if(quit_now){
1833
goto end;
1834
}
1835
1207
exitcode = EXIT_FAILURE;
1208
goto end;
1209
}
1836
1210
port = (uint16_t)tmpmax;
1837
1211
*address = '\0';
1212
address = connect_to;
1838
1213
/* Colon in address indicates IPv6 */
1839
1214
int af;
1840
if(strchr(connect_to, ':') != NULL){
1215
if(strchr(address, ':') != NULL){
1841
1216
af = AF_INET6;
1842
/* Accept [] around IPv6 address - see RFC 5952 */
1843
if(connect_to[0] == '[' and address[-1] == ']')
1844
{
1845
connect_to++;
1846
address[-1] = '\0';
1847
}
1848
1217
} else {
1849
1218
af = AF_INET;
1850
1219
}
1851
address = connect_to;
1852
1853
if(quit_now){
1854
goto end;
1855
}
1856
1857
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
1859
if(quit_now or ret == 0){
1860
break;
1861
}
1862
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
1865
}
1866
sleep((int)retry_interval);
1867
}
1868
1869
if (not quit_now){
1220
ret = start_mandos_communication(address, port, if_index, af);
1221
if(ret < 0){
1222
exitcode = EXIT_FAILURE;
1223
} else {
1870
1224
exitcode = EXIT_SUCCESS;
1871
1225
}
1872
1873
goto end;
1874
}
1875
1876
if(quit_now){
1877
goto end;
1878
}
1879
1226
goto end;
1227
}
1228
1880
1229
{
1881
1230
AvahiServerConfig config;
1882
1231
/* Do not publish any local Zeroconf records */
1899
1248
if(mc.server == NULL){
1900
1249
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
1250
avahi_strerror(error));
1902
exitcode = EX_UNAVAILABLE;
1903
goto end;
1904
}
1905
1906
if(quit_now){
1251
exitcode = EXIT_FAILURE;
1907
1252
goto end;
1908
1253
}
1909
1254
1910
1255
/* Create the Avahi service browser */
1911
1256
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1257
AVAHI_PROTO_INET6, "_mandos._tcp",
1913
1258
NULL, 0, browse_callback, NULL);
1914
1259
if(sb == NULL){
1915
1260
fprintf(stderr, "Failed to create service browser: %s\n",
1916
1261
avahi_strerror(avahi_server_errno(mc.server)));
1917
exitcode = EX_UNAVAILABLE;
1918
goto end;
1919
}
1920
1921
if(quit_now){
1262
exitcode = EXIT_FAILURE;
1922
1263
goto end;
1923
1264
}
1924
1265
1927
1268
if(debug){
1928
1269
fprintf(stderr, "Starting Avahi loop search\n");
1929
1270
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
1933
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
1936
}
1271
1272
avahi_simple_poll_loop(mc.simple_poll);
1937
1273
1938
1274
end:
1939
1275
1960
1296
if(gpgme_initialized){
1961
1297
gpgme_release(mc.ctx);
1962
1298
}
1963
1964
/* Cleans up the circular linked list of Mandos servers the client
1965
has seen */
1966
if(mc.current_server != NULL){
1967
mc.current_server->prev->next = NULL;
1968
while(mc.current_server != NULL){
1969
server *next = mc.current_server->next;
1970
free(mc.current_server);
1971
mc.current_server = next;
1972
}
1973
}
1974
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1992
}
1993
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2004
}
2005
}
2006
2007
/* Removes the GPGME temp directory and all files inside */
1299
1300
/* Removes the temp directory used by GPGME */
2008
1301
if(tempdir_created){
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
1302
DIR *d;
1303
struct dirent *direntry;
1304
d = opendir(tempdir);
1305
if(d == NULL){
1306
if(errno != ENOENT){
1307
perror("opendir");
1308
}
1309
} else {
1310
while(true){
1311
direntry = readdir(d);
1312
if(direntry == NULL){
1313
break;
1314
}
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
continue;
1321
}
2016
1322
char *fullname = NULL;
2017
1323
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
1324
direntry->d_name);
2019
1325
if(ret < 0){
2020
perror_plus("asprintf");
1326
perror("asprintf");
2021
1327
continue;
2022
1328
}
2023
1329
ret = remove(fullname);
2027
1333
}
2028
1334
free(fullname);
2029
1335
}
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
1336
closedir(d);
2036
1337
}
2037
1338
ret = rmdir(tempdir);
2038
1339
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
2040
}
2041
}
2042
2043
if(quit_now){
2044
sigemptyset(&old_sigterm_action.sa_mask);
2045
old_sigterm_action.sa_handler = SIG_DFL;
2046
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2047
&old_sigterm_action,
2048
NULL));
2049
if(ret == -1){
2050
perror_plus("sigaction");
2051
}
2052
do {
2053
ret = raise(signal_received);
2054
} while(ret != 0 and errno == EINTR);
2055
if(ret != 0){
2056
perror_plus("raise");
2057
abort();
2058
}
2059
TEMP_FAILURE_RETRY(pause());
1340
perror("rmdir");
1341
}
2060
1342
}
2061
1343
2062
1344
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0