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- Committer: Teddy Hogeborn
- Date: 2011-07-15 01:07:51 UTC
- Revision ID: teddy@fukt.bsnet.se-20110715010751-bh9rhcm6hv8f174e
* initramfs-tools-script: Bug fix: Add missing "--options" argument to
getopt.
getopt.
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
39
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
58
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
69
SIOCSIFFLAGS, if_indextoname(),
65
70
if_nametoindex(), IF_NAMESIZE */
67
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
83
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
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 */
81
88
82
89
#ifdef __linux__
83
90
#include <sys/klog.h> /* klogctl() */
121
128
static const char mandos_protocol_version[] = "1";
122
129
const char *argp_program_version = "mandos-client " VERSION;
123
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.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;
124
144
125
145
/* Used for passing in values through the Avahi callback functions */
126
146
typedef struct {
131
151
gnutls_dh_params_t dh_params;
132
152
const char *priority;
133
153
gpgme_ctx_t ctx;
154
server *current_server;
134
155
} mandos_context;
135
156
136
157
/* global context so signal handler can reach it*/
137
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
159
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
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
}
140
172
141
173
/*
142
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
155
187
return buffer_capacity;
156
188
}
157
189
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
193
int ret;
194
server *new_server = malloc(sizeof(server));
195
if(new_server == NULL){
196
perror_plus("malloc");
197
return -1;
198
}
199
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
203
if(new_server->ip == NULL){
204
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
209
new_server->next = new_server;
210
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
213
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
216
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
225
}
226
158
227
/*
159
228
* Initialize GPGME.
160
229
*/
161
230
static bool init_gpgme(const char *seckey,
162
231
const char *pubkey, const char *tempdir){
163
int ret;
164
232
gpgme_error_t rc;
165
233
gpgme_engine_info_t engine_info;
166
234
169
237
* Helper function to insert pub and seckey to the engine keyring.
170
238
*/
171
239
bool import_key(const char *filename){
240
int ret;
172
241
int fd;
173
242
gpgme_data_t pgp_data;
174
243
175
244
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
245
if(fd == -1){
177
perror("open");
246
perror_plus("open");
178
247
return false;
179
248
}
180
249
194
263
195
264
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
265
if(ret == -1){
197
perror("close");
266
perror_plus("close");
198
267
}
199
268
gpgme_data_release(pgp_data);
200
269
return true;
245
314
return false;
246
315
}
247
316
248
return true;
317
return true;
249
318
}
250
319
251
320
/*
305
374
}
306
375
gpgme_recipient_t recipient;
307
376
recipient = result->recipients;
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
}
377
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
384
recipient = recipient->next;
318
385
}
319
386
}
320
387
}
327
394
328
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
396
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
397
perror_plus("gpgme_data_seek");
331
398
plaintext_length = -1;
332
399
goto decrypt_end;
333
400
}
338
405
(size_t)plaintext_length,
339
406
plaintext_capacity);
340
407
if(plaintext_capacity == 0){
341
perror("incbuffer");
408
perror_plus("incbuffer");
342
409
plaintext_length = -1;
343
410
goto decrypt_end;
344
411
}
351
418
break;
352
419
}
353
420
if(ret < 0){
354
perror("gpgme_data_read");
421
perror_plus("gpgme_data_read");
355
422
plaintext_length = -1;
356
423
goto decrypt_end;
357
424
}
414
481
}
415
482
416
483
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
418
485
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
486
fprintf(stderr, "GnuTLS memory error: %s\n",
423
487
safer_gnutls_strerror(ret));
424
488
gnutls_global_deinit();
425
489
return -1;
472
536
static int init_gnutls_session(gnutls_session_t *session){
473
537
int ret;
474
538
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
539
do {
540
ret = gnutls_init(session, GNUTLS_SERVER);
541
if(quit_now){
542
return -1;
543
}
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
476
545
if(ret != GNUTLS_E_SUCCESS){
477
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
547
safer_gnutls_strerror(ret));
480
549
481
550
{
482
551
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
552
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
554
if(quit_now){
555
gnutls_deinit(*session);
556
return -1;
557
}
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
484
559
if(ret != GNUTLS_E_SUCCESS){
485
560
fprintf(stderr, "Syntax error at: %s\n", err);
486
561
fprintf(stderr, "GnuTLS error: %s\n",
490
565
}
491
566
}
492
567
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
568
do {
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
571
if(quit_now){
572
gnutls_deinit(*session);
573
return -1;
574
}
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
576
if(ret != GNUTLS_E_SUCCESS){
496
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
578
safer_gnutls_strerror(ret));
500
581
}
501
582
502
583
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
585
506
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
507
587
516
596
static int start_mandos_communication(const char *ip, uint16_t port,
517
597
AvahiIfIndex if_index,
518
598
int af){
519
int ret, tcp_sd;
599
int ret, tcp_sd = -1;
520
600
ssize_t sret;
521
601
union {
522
602
struct sockaddr_in in;
523
603
struct sockaddr_in6 in6;
524
604
} to;
525
605
char *buffer = NULL;
526
char *decrypted_buffer;
606
char *decrypted_buffer = NULL;
527
607
size_t buffer_length = 0;
528
608
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
530
609
size_t written;
531
int retval = 0;
610
int retval = -1;
532
611
gnutls_session_t session;
533
612
int pf; /* Protocol family */
534
613
614
errno = 0;
615
616
if(quit_now){
617
errno = EINTR;
618
return -1;
619
}
620
535
621
switch(af){
536
622
case AF_INET6:
537
623
pf = PF_INET6;
541
627
break;
542
628
default:
543
629
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
544
631
return -1;
545
632
}
546
633
556
643
557
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
645
if(tcp_sd < 0){
559
perror("socket");
560
return -1;
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
649
goto mandos_end;
650
}
651
652
if(quit_now){
653
errno = EINTR;
654
goto mandos_end;
561
655
}
562
656
563
657
memset(&to, 0, sizeof(to));
564
658
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
659
to.in6.sin6_family = (sa_family_t)af;
566
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
661
} else { /* IPv4 */
568
662
to.in.sin_family = (sa_family_t)af;
569
663
ret = inet_pton(af, ip, &to.in.sin_addr);
570
664
}
571
665
if(ret < 0 ){
572
perror("inet_pton");
573
return -1;
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
669
goto mandos_end;
574
670
}
575
671
if(ret == 0){
672
int e = errno;
576
673
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
674
errno = e;
675
goto mandos_end;
578
676
}
579
677
if(af == AF_INET6){
580
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
587
685
if(if_index == AVAHI_IF_UNSPEC){
588
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
687
" without a network interface\n");
590
return -1;
688
errno = EINVAL;
689
goto mandos_end;
591
690
}
592
691
/* Set the network interface number as scope */
593
692
to.in6.sin6_scope_id = (uint32_t)if_index;
598
697
-Wunreachable-code */
599
698
}
600
699
700
if(quit_now){
701
errno = EINTR;
702
goto mandos_end;
703
}
704
601
705
if(debug){
602
706
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
707
char interface[IF_NAMESIZE];
604
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
709
perror_plus("if_indextoname");
606
710
} else {
607
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
712
ip, interface, port);
622
726
sizeof(addrstr));
623
727
}
624
728
if(pcret == NULL){
625
perror("inet_ntop");
729
perror_plus("inet_ntop");
626
730
} else {
627
731
if(strcmp(addrstr, ip) != 0){
628
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
630
734
}
631
735
}
632
736
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
633
742
if(af == AF_INET6){
634
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
744
} else {
636
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
746
}
638
747
if(ret < 0){
639
perror("connect");
640
return -1;
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
641
759
}
642
760
643
761
const char *out = mandos_protocol_version;
647
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
766
out_size - written));
649
767
if(ret == -1){
650
perror("write");
651
retval = -1;
768
int e = errno;
769
perror_plus("write");
770
errno = e;
652
771
goto mandos_end;
653
772
}
654
773
written += (size_t)ret;
662
781
break;
663
782
}
664
783
}
784
785
if(quit_now){
786
errno = EINTR;
787
goto mandos_end;
788
}
665
789
}
666
790
667
791
if(debug){
668
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
793
}
670
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
800
/* Spurious warning from -Wint-to-pointer-cast */
671
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
802
673
do{
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
do {
674
809
ret = gnutls_handshake(session);
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
675
814
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
815
677
816
if(ret != GNUTLS_E_SUCCESS){
679
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
680
819
gnutls_perror(ret);
681
820
}
682
retval = -1;
821
errno = EPROTO;
683
822
goto mandos_end;
684
823
}
685
824
691
830
}
692
831
693
832
while(true){
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
694
839
buffer_capacity = incbuffer(&buffer, buffer_length,
695
840
buffer_capacity);
696
841
if(buffer_capacity == 0){
697
perror("incbuffer");
698
retval = -1;
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
845
goto mandos_end;
846
}
847
848
if(quit_now){
849
errno = EINTR;
699
850
goto mandos_end;
700
851
}
701
852
710
861
case GNUTLS_E_AGAIN:
711
862
break;
712
863
case GNUTLS_E_REHANDSHAKE:
713
do{
864
do {
714
865
ret = gnutls_handshake(session);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
715
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
872
if(ret < 0){
717
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
718
874
gnutls_perror(ret);
719
retval = -1;
875
errno = EPROTO;
720
876
goto mandos_end;
721
877
}
722
878
break;
723
879
default:
724
880
fprintf(stderr, "Unknown error while reading data from"
725
881
" encrypted session with Mandos server\n");
726
retval = -1;
727
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
728
884
goto mandos_end;
729
885
}
730
886
} else {
736
892
fprintf(stderr, "Closing TLS session\n");
737
893
}
738
894
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
899
900
do {
901
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
902
if(quit_now){
903
errno = EINTR;
904
goto mandos_end;
905
}
906
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
907
741
908
if(buffer_length > 0){
909
ssize_t decrypted_buffer_size;
742
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
911
buffer_length,
744
912
&decrypted_buffer);
745
913
if(decrypted_buffer_size >= 0){
914
746
915
written = 0;
747
916
while(written < (size_t) decrypted_buffer_size){
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
748
922
ret = (int)fwrite(decrypted_buffer + written, 1,
749
923
(size_t)decrypted_buffer_size - written,
750
924
stdout);
751
925
if(ret == 0 and ferror(stdout)){
926
int e = errno;
752
927
if(debug){
753
928
fprintf(stderr, "Error writing encrypted data: %s\n",
754
929
strerror(errno));
755
930
}
756
retval = -1;
757
break;
931
errno = e;
932
goto mandos_end;
758
933
}
759
934
written += (size_t)ret;
760
935
}
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
936
retval = 0;
764
937
}
765
} else {
766
retval = -1;
767
938
}
768
939
769
940
/* Shutdown procedure */
770
941
771
942
mandos_end:
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
943
{
944
int e = errno;
945
free(decrypted_buffer);
946
free(buffer);
947
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
949
}
950
if(ret == -1){
951
if(e == 0){
952
e = errno;
953
}
954
perror_plus("close");
955
}
956
gnutls_deinit(session);
957
errno = e;
958
if(quit_now){
959
errno = EINTR;
960
retval = -1;
961
}
776
962
}
777
gnutls_deinit(session);
778
963
return retval;
779
964
}
780
965
797
982
/* Called whenever a service has been resolved successfully or
798
983
timed out */
799
984
985
if(quit_now){
986
return;
987
}
988
800
989
switch(event){
801
990
default:
802
991
case AVAHI_RESOLVER_FAILURE:
818
1007
avahi_proto_to_af(proto));
819
1008
if(ret == 0){
820
1009
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
821
1013
}
822
1014
}
823
1015
}
839
1031
/* Called whenever a new services becomes available on the LAN or
840
1032
is removed from the LAN */
841
1033
1034
if(quit_now){
1035
return;
1036
}
1037
842
1038
switch(event){
843
1039
default:
844
1040
case AVAHI_BROWSER_FAILURE:
873
1069
}
874
1070
}
875
1071
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){
1072
/* Signal handler that stops main loop after SIGTERM */
1073
static void handle_sigterm(int sig){
880
1074
if(quit_now){
881
1075
return;
882
1076
}
883
1077
quit_now = 1;
1078
signal_received = sig;
884
1079
int old_errno = errno;
1080
/* set main loop to exit */
885
1081
if(mc.simple_poll != NULL){
886
1082
avahi_simple_poll_quit(mc.simple_poll);
887
1083
}
888
1084
errno = old_errno;
889
1085
}
890
1086
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1188
}
1189
return 1;
1190
}
1191
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
int ret;
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1208
1209
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1214
}
1215
ret = avahi_simple_poll_iterate(s, -1);
1216
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1220
}
1221
/* the current time */
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1223
if(ret == -1){
1224
perror_plus("clock_gettime");
1225
return -1;
1226
}
1227
/* Calculating in ms how long time between now and server
1228
who we visted longest time ago. Now - last seen. */
1229
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1231
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1233
/* total time is 10s/10,000ms.
1234
Converting to s from ms by dividing by 1,000,
1235
and ns to ms by dividing by 1,000,000. */
1236
block_time = ((retry_interval
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1242
}
1243
1244
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1249
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1251
return 0;
1252
}
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1255
if(ret == -1){
1256
perror_plus("clock_gettime");
1257
return -1;
1258
}
1259
mc.current_server = mc.current_server->next;
1260
block_time = 0; /* Call avahi to find new Mandos
1261
servers, but don't block */
1262
}
1263
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
}
1266
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1268
return (ret != 1) ? ret : 0;
1269
}
1270
}
1271
}
1272
}
1273
891
1274
int main(int argc, char *argv[]){
892
1275
AvahiSServiceBrowser *sb = NULL;
893
1276
int error;
895
1278
intmax_t tmpmax;
896
1279
char *tmp;
897
1280
int exitcode = EXIT_SUCCESS;
898
const char *interface = "eth0";
1281
const char *interface = "";
899
1282
struct ifreq network;
900
int sd;
1283
int sd = -1;
1284
bool take_down_interface = false;
901
1285
uid_t uid;
902
1286
gid_t gid;
903
char *connect_to = NULL;
904
1287
char tempdir[] = "/tmp/mandosXXXXXX";
905
1288
bool tempdir_created = false;
906
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
910
1293
bool gnutls_initialized = false;
911
1294
bool gpgme_initialized = false;
912
1295
float delay = 2.5f;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
913
1298
914
struct sigaction old_sigterm_action;
1299
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
915
1300
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
916
1301
1302
uid = getuid();
1303
gid = getgid();
1304
1305
/* Lower any group privileges we might have, just to be safe */
1306
errno = 0;
1307
ret = setgid(gid);
1308
if(ret == -1){
1309
perror_plus("setgid");
1310
}
1311
1312
/* Lower user privileges (temporarily) */
1313
errno = 0;
1314
ret = seteuid(uid);
1315
if(ret == -1){
1316
perror_plus("seteuid");
1317
}
1318
1319
if(quit_now){
1320
goto end;
1321
}
1322
917
1323
{
918
1324
struct argp_option options[] = {
919
1325
{ .name = "debug", .key = 128,
948
1354
.arg = "SECONDS",
949
1355
.doc = "Maximum delay to wait for interface startup",
950
1356
.group = 2 },
1357
{ .name = "retry", .key = 132,
1358
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1360
.group = 2 },
1361
/*
1362
* These reproduce what we would get without ARGP_NO_HELP
1363
*/
1364
{ .name = "help", .key = '?',
1365
.doc = "Give this help list", .group = -1 },
1366
{ .name = "usage", .key = -3,
1367
.doc = "Give a short usage message", .group = -1 },
1368
{ .name = "version", .key = 'V',
1369
.doc = "Print program version", .group = -1 },
951
1370
{ .name = NULL }
952
1371
};
953
1372
954
1373
error_t parse_opt(int key, char *arg,
955
1374
struct argp_state *state){
1375
errno = 0;
956
1376
switch(key){
957
1377
case 128: /* --debug */
958
1378
debug = true;
974
1394
tmpmax = strtoimax(arg, &tmp, 10);
975
1395
if(errno != 0 or tmp == arg or *tmp != '\0'
976
1396
or tmpmax != (typeof(mc.dh_bits))tmpmax){
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
1397
argp_error(state, "Bad number of DH bits");
979
1398
}
980
1399
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
981
1400
break;
986
1405
errno = 0;
987
1406
delay = strtof(arg, &tmp);
988
1407
if(errno != 0 or tmp == arg or *tmp != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
1408
argp_error(state, "Bad delay");
1409
}
1410
case 132: /* --retry */
1411
errno = 0;
1412
retry_interval = strtod(arg, &tmp);
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1415
argp_error(state, "Bad retry interval");
991
1416
}
992
1417
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
1418
/*
1419
* These reproduce what we would get without ARGP_NO_HELP
1420
*/
1421
case '?': /* --help */
1422
argp_state_help(state, state->out_stream,
1423
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1424
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1425
case -3: /* --usage */
1426
argp_state_help(state, state->out_stream,
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1430
exit(argp_err_exit_status);
996
1431
break;
997
1432
default:
998
1433
return ARGP_ERR_UNKNOWN;
999
1434
}
1000
return 0;
1435
return errno;
1001
1436
}
1002
1437
1003
1438
struct argp argp = { .options = options, .parser = parse_opt,
1004
1439
.args_doc = "",
1005
1440
.doc = "Mandos client -- Get and decrypt"
1006
1441
" passwords from a Mandos server" };
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;
1442
ret = argp_parse(&argp, argc, argv,
1443
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1444
switch(ret){
1445
case 0:
1446
break;
1447
case ENOMEM:
1448
default:
1449
errno = ret;
1450
perror_plus("argp_parse");
1451
exitcode = EX_OSERR;
1452
goto end;
1453
case EINVAL:
1454
exitcode = EX_USAGE;
1011
1455
goto end;
1012
1456
}
1013
1457
}
1015
1459
if(not debug){
1016
1460
avahi_set_log_function(empty_log);
1017
1461
}
1462
1463
if(interface[0] == '\0'){
1464
struct dirent **direntries;
1465
ret = scandir(sys_class_net, &direntries, good_interface,
1466
alphasort);
1467
if(ret >= 1){
1468
/* Pick the first good interface */
1469
interface = strdup(direntries[0]->d_name);
1470
if(debug){
1471
fprintf(stderr, "Using interface \"%s\"\n", interface);
1472
}
1473
if(interface == NULL){
1474
perror_plus("malloc");
1475
free(direntries);
1476
exitcode = EXIT_FAILURE;
1477
goto end;
1478
}
1479
free(direntries);
1480
} else {
1481
free(direntries);
1482
fprintf(stderr, "Could not find a network interface\n");
1483
exitcode = EXIT_FAILURE;
1484
goto end;
1485
}
1486
}
1018
1487
1019
1488
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1020
1489
from the signal handler */
1023
1492
mc.simple_poll = avahi_simple_poll_new();
1024
1493
if(mc.simple_poll == NULL){
1025
1494
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
1495
exitcode = EX_UNAVAILABLE;
1027
1496
goto end;
1028
1497
}
1029
1498
1030
1499
sigemptyset(&sigterm_action.sa_mask);
1031
1500
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1032
1501
if(ret == -1){
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1502
perror_plus("sigaddset");
1503
exitcode = EX_OSERR;
1035
1504
goto end;
1036
1505
}
1037
1506
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1038
1507
if(ret == -1){
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1508
perror_plus("sigaddset");
1509
exitcode = EX_OSERR;
1041
1510
goto end;
1042
1511
}
1043
1512
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1044
1513
if(ret == -1){
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
}
1514
perror_plus("sigaddset");
1515
exitcode = EX_OSERR;
1516
goto end;
1517
}
1518
/* Need to check if the handler is SIG_IGN before handling:
1519
| [[info:libc:Initial Signal Actions]] |
1520
| [[info:libc:Basic Signal Handling]] |
1521
*/
1522
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1523
if(ret == -1){
1524
perror_plus("sigaction");
1525
return EX_OSERR;
1526
}
1527
if(old_sigterm_action.sa_handler != SIG_IGN){
1528
ret = sigaction(SIGINT, &sigterm_action, NULL);
1529
if(ret == -1){
1530
perror_plus("sigaction");
1531
exitcode = EX_OSERR;
1532
goto end;
1533
}
1534
}
1535
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1536
if(ret == -1){
1537
perror_plus("sigaction");
1538
return EX_OSERR;
1539
}
1540
if(old_sigterm_action.sa_handler != SIG_IGN){
1541
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1542
if(ret == -1){
1543
perror_plus("sigaction");
1544
exitcode = EX_OSERR;
1545
goto end;
1546
}
1547
}
1548
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1549
if(ret == -1){
1550
perror_plus("sigaction");
1551
return EX_OSERR;
1552
}
1553
if(old_sigterm_action.sa_handler != SIG_IGN){
1554
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1555
if(ret == -1){
1556
perror_plus("sigaction");
1557
exitcode = EX_OSERR;
1558
goto end;
1559
}
1560
}
1055
1561
1056
1562
/* If the interface is down, bring it up */
1057
if(interface[0] != '\0'){
1563
if(strcmp(interface, "none") != 0){
1564
if_index = (AvahiIfIndex) if_nametoindex(interface);
1565
if(if_index == 0){
1566
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1567
exitcode = EX_UNAVAILABLE;
1568
goto end;
1569
}
1570
1571
if(quit_now){
1572
goto end;
1573
}
1574
1575
/* Re-raise priviliges */
1576
errno = 0;
1577
ret = seteuid(0);
1578
if(ret == -1){
1579
perror_plus("seteuid");
1580
}
1581
1058
1582
#ifdef __linux__
1059
1583
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1060
messages to mess up the prompt */
1584
messages about the network interface to mess up the prompt */
1061
1585
ret = klogctl(8, NULL, 5);
1062
1586
bool restore_loglevel = true;
1063
1587
if(ret == -1){
1064
1588
restore_loglevel = false;
1065
perror("klogctl");
1589
perror_plus("klogctl");
1066
1590
}
1067
1591
#endif /* __linux__ */
1068
1592
1069
1593
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1070
1594
if(sd < 0){
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1595
perror_plus("socket");
1596
exitcode = EX_OSERR;
1073
1597
#ifdef __linux__
1074
1598
if(restore_loglevel){
1075
1599
ret = klogctl(7, NULL, 0);
1076
1600
if(ret == -1){
1077
perror("klogctl");
1601
perror_plus("klogctl");
1078
1602
}
1079
1603
}
1080
1604
#endif /* __linux__ */
1605
/* Lower privileges */
1606
errno = 0;
1607
ret = seteuid(uid);
1608
if(ret == -1){
1609
perror_plus("seteuid");
1610
}
1081
1611
goto end;
1082
1612
}
1083
1613
strcpy(network.ifr_name, interface);
1084
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1085
1615
if(ret == -1){
1086
perror("ioctl SIOCGIFFLAGS");
1616
perror_plus("ioctl SIOCGIFFLAGS");
1087
1617
#ifdef __linux__
1088
1618
if(restore_loglevel){
1089
1619
ret = klogctl(7, NULL, 0);
1090
1620
if(ret == -1){
1091
perror("klogctl");
1621
perror_plus("klogctl");
1092
1622
}
1093
1623
}
1094
1624
#endif /* __linux__ */
1095
exitcode = EXIT_FAILURE;
1625
exitcode = EX_OSERR;
1626
/* Lower privileges */
1627
errno = 0;
1628
ret = seteuid(uid);
1629
if(ret == -1){
1630
perror_plus("seteuid");
1631
}
1096
1632
goto end;
1097
1633
}
1098
1634
if((network.ifr_flags & IFF_UP) == 0){
1099
1635
network.ifr_flags |= IFF_UP;
1636
take_down_interface = true;
1100
1637
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1101
1638
if(ret == -1){
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1639
take_down_interface = false;
1640
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1641
exitcode = EX_OSERR;
1104
1642
#ifdef __linux__
1105
1643
if(restore_loglevel){
1106
1644
ret = klogctl(7, NULL, 0);
1107
1645
if(ret == -1){
1108
perror("klogctl");
1646
perror_plus("klogctl");
1109
1647
}
1110
1648
}
1111
1649
#endif /* __linux__ */
1650
/* Lower privileges */
1651
errno = 0;
1652
ret = seteuid(uid);
1653
if(ret == -1){
1654
perror_plus("seteuid");
1655
}
1112
1656
goto end;
1113
1657
}
1114
1658
}
1115
/* sleep checking until interface is running */
1659
/* Sleep checking until interface is running.
1660
Check every 0.25s, up to total time of delay */
1116
1661
for(int i=0; i < delay * 4; i++){
1117
1662
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1118
1663
if(ret == -1){
1119
perror("ioctl SIOCGIFFLAGS");
1664
perror_plus("ioctl SIOCGIFFLAGS");
1120
1665
} else if(network.ifr_flags & IFF_RUNNING){
1121
1666
break;
1122
1667
}
1123
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1124
1669
ret = nanosleep(&sleeptime, NULL);
1125
1670
if(ret == -1 and errno != EINTR){
1126
perror("nanosleep");
1671
perror_plus("nanosleep");
1127
1672
}
1128
1673
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
1674
if(not take_down_interface){
1675
/* We won't need the socket anymore */
1676
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1677
if(ret == -1){
1678
perror_plus("close");
1679
}
1132
1680
}
1133
1681
#ifdef __linux__
1134
1682
if(restore_loglevel){
1135
1683
/* Restores kernel loglevel to default */
1136
1684
ret = klogctl(7, NULL, 0);
1137
1685
if(ret == -1){
1138
perror("klogctl");
1686
perror_plus("klogctl");
1139
1687
}
1140
1688
}
1141
1689
#endif /* __linux__ */
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");
1690
/* Lower privileges */
1691
errno = 0;
1692
if(take_down_interface){
1693
/* Lower privileges */
1694
ret = seteuid(uid);
1695
if(ret == -1){
1696
perror_plus("seteuid");
1697
}
1698
} else {
1699
/* Lower privileges permanently */
1700
ret = setuid(uid);
1701
if(ret == -1){
1702
perror_plus("setuid");
1703
}
1704
}
1705
}
1706
1707
if(quit_now){
1708
goto end;
1156
1709
}
1157
1710
1158
1711
ret = init_gnutls_global(pubkey, seckey);
1159
1712
if(ret == -1){
1160
1713
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
1714
exitcode = EX_UNAVAILABLE;
1162
1715
goto end;
1163
1716
} else {
1164
1717
gnutls_initialized = true;
1165
1718
}
1166
1719
1720
if(quit_now){
1721
goto end;
1722
}
1723
1167
1724
if(mkdtemp(tempdir) == NULL){
1168
perror("mkdtemp");
1725
perror_plus("mkdtemp");
1169
1726
goto end;
1170
1727
}
1171
1728
tempdir_created = true;
1172
1729
1730
if(quit_now){
1731
goto end;
1732
}
1733
1173
1734
if(not init_gpgme(pubkey, seckey, tempdir)){
1174
1735
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
1736
exitcode = EX_UNAVAILABLE;
1176
1737
goto end;
1177
1738
} else {
1178
1739
gpgme_initialized = true;
1179
1740
}
1180
1741
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
}
1742
if(quit_now){
1743
goto end;
1188
1744
}
1189
1745
1190
1746
if(connect_to != NULL){
1193
1749
char *address = strrchr(connect_to, ':');
1194
1750
if(address == NULL){
1195
1751
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1752
exitcode = EX_USAGE;
1753
goto end;
1754
}
1755
1756
if(quit_now){
1757
goto end;
1758
}
1759
1199
1760
uint16_t port;
1200
1761
errno = 0;
1201
1762
tmpmax = strtoimax(address+1, &tmp, 10);
1202
1763
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1203
1764
or tmpmax != (uint16_t)tmpmax){
1204
1765
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
1766
exitcode = EX_USAGE;
1767
goto end;
1768
}
1769
1770
if(quit_now){
1771
goto end;
1772
}
1773
1208
1774
port = (uint16_t)tmpmax;
1209
1775
*address = '\0';
1210
1776
address = connect_to;
1215
1781
} else {
1216
1782
af = AF_INET;
1217
1783
}
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
1784
1785
if(quit_now){
1786
goto end;
1787
}
1788
1789
while(not quit_now){
1790
ret = start_mandos_communication(address, port, if_index, af);
1791
if(quit_now or ret == 0){
1792
break;
1793
}
1794
sleep((int)retry_interval or 1);
1795
};
1796
1797
if (not quit_now){
1222
1798
exitcode = EXIT_SUCCESS;
1223
1799
}
1224
goto end;
1225
}
1226
1800
1801
goto end;
1802
}
1803
1804
if(quit_now){
1805
goto end;
1806
}
1807
1227
1808
{
1228
1809
AvahiServerConfig config;
1229
1810
/* Do not publish any local Zeroconf records */
1246
1827
if(mc.server == NULL){
1247
1828
fprintf(stderr, "Failed to create Avahi server: %s\n",
1248
1829
avahi_strerror(error));
1249
exitcode = EXIT_FAILURE;
1830
exitcode = EX_UNAVAILABLE;
1831
goto end;
1832
}
1833
1834
if(quit_now){
1250
1835
goto end;
1251
1836
}
1252
1837
1257
1842
if(sb == NULL){
1258
1843
fprintf(stderr, "Failed to create service browser: %s\n",
1259
1844
avahi_strerror(avahi_server_errno(mc.server)));
1260
exitcode = EXIT_FAILURE;
1845
exitcode = EX_UNAVAILABLE;
1846
goto end;
1847
}
1848
1849
if(quit_now){
1261
1850
goto end;
1262
1851
}
1263
1852
1266
1855
if(debug){
1267
1856
fprintf(stderr, "Starting Avahi loop search\n");
1268
1857
}
1269
1270
avahi_simple_poll_loop(mc.simple_poll);
1858
1859
ret = avahi_loop_with_timeout(mc.simple_poll,
1860
(int)(retry_interval * 1000));
1861
if(debug){
1862
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1863
(ret == 0) ? "successfully" : "with error");
1864
}
1271
1865
1272
1866
end:
1273
1867
1294
1888
if(gpgme_initialized){
1295
1889
gpgme_release(mc.ctx);
1296
1890
}
1297
1298
/* Removes the temp directory used by GPGME */
1891
1892
/* Cleans up the circular linked list of Mandos servers the client
1893
has seen */
1894
if(mc.current_server != NULL){
1895
mc.current_server->prev->next = NULL;
1896
while(mc.current_server != NULL){
1897
server *next = mc.current_server->next;
1898
free(mc.current_server);
1899
mc.current_server = next;
1900
}
1901
}
1902
1903
/* Take down the network interface */
1904
if(take_down_interface){
1905
/* Re-raise priviliges */
1906
errno = 0;
1907
ret = seteuid(0);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
if(geteuid() == 0){
1912
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1913
if(ret == -1){
1914
perror_plus("ioctl SIOCGIFFLAGS");
1915
} else if(network.ifr_flags & IFF_UP) {
1916
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1917
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1920
}
1921
}
1922
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1923
if(ret == -1){
1924
perror_plus("close");
1925
}
1926
/* Lower privileges permanently */
1927
errno = 0;
1928
ret = setuid(uid);
1929
if(ret == -1){
1930
perror_plus("setuid");
1931
}
1932
}
1933
}
1934
1935
/* Removes the GPGME temp directory and all files inside */
1299
1936
if(tempdir_created){
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
}
1937
struct dirent **direntries = NULL;
1938
struct dirent *direntry = NULL;
1939
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1940
if (ret > 0){
1941
for(int i = 0; i < ret; i++){
1942
direntry = direntries[i];
1320
1943
char *fullname = NULL;
1321
1944
ret = asprintf(&fullname, "%s/%s", tempdir,
1322
1945
direntry->d_name);
1323
1946
if(ret < 0){
1324
perror("asprintf");
1947
perror_plus("asprintf");
1325
1948
continue;
1326
1949
}
1327
1950
ret = remove(fullname);
1331
1954
}
1332
1955
free(fullname);
1333
1956
}
1334
closedir(d);
1957
}
1958
1959
/* need to be cleaned even if ret == 0 because man page doesn't
1960
specify */
1961
free(direntries);
1962
if (ret == -1){
1963
perror_plus("scandir");
1335
1964
}
1336
1965
ret = rmdir(tempdir);
1337
1966
if(ret == -1 and errno != ENOENT){
1338
perror("rmdir");
1339
}
1967
perror_plus("rmdir");
1968
}
1969
}
1970
1971
if(quit_now){
1972
sigemptyset(&old_sigterm_action.sa_mask);
1973
old_sigterm_action.sa_handler = SIG_DFL;
1974
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1975
&old_sigterm_action,
1976
NULL));
1977
if(ret == -1){
1978
perror_plus("sigaction");
1979
}
1980
do {
1981
ret = raise(signal_received);
1982
} while(ret != 0 and errno == EINTR);
1983
if(ret != 0){
1984
perror_plus("raise");
1985
abort();
1986
}
1987
TEMP_FAILURE_RETRY(pause());
1340
1988
}
1341
1989
1342
1990
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0