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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:39:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20090905173934-gs0r858omhudc71m
* plugin-runner.c (main): Move variables "tmpmax" and "tmp" into
the innermost scope possible.
the innermost scope possible.
- 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
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
85
89
86
#ifdef __linux__
90
87
#include <sys/klog.h> /* klogctl() */
128
125
static const char mandos_protocol_version[] = "1";
129
126
const char *argp_program_version = "mandos-client " VERSION;
130
127
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;
144
128
145
129
/* Used for passing in values through the Avahi callback functions */
146
130
typedef struct {
151
135
gnutls_dh_params_t dh_params;
152
136
const char *priority;
153
137
gpgme_ctx_t ctx;
154
server *current_server;
155
138
} mandos_context;
156
139
157
140
/* global context so signal handler can reach it*/
158
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
142
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
172
144
173
145
/*
174
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
187
159
return buffer_capacity;
188
160
}
189
161
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
228
162
/*
229
163
* Initialize GPGME.
230
164
*/
231
165
static bool init_gpgme(const char *seckey,
232
166
const char *pubkey, const char *tempdir){
167
int ret;
233
168
gpgme_error_t rc;
234
169
gpgme_engine_info_t engine_info;
235
170
238
173
* Helper function to insert pub and seckey to the engine keyring.
239
174
*/
240
175
bool import_key(const char *filename){
241
int ret;
242
176
int fd;
243
177
gpgme_data_t pgp_data;
244
178
245
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
246
180
if(fd == -1){
247
perror_plus("open");
181
perror("open");
248
182
return false;
249
183
}
250
184
264
198
265
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
266
200
if(ret == -1){
267
perror_plus("close");
201
perror("close");
268
202
}
269
203
gpgme_data_release(pgp_data);
270
204
return true;
283
217
return false;
284
218
}
285
219
286
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
287
221
rc = gpgme_get_engine_info(&engine_info);
288
222
if(rc != GPG_ERR_NO_ERROR){
289
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
395
329
396
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
397
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
398
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
399
333
plaintext_length = -1;
400
334
goto decrypt_end;
401
335
}
406
340
(size_t)plaintext_length,
407
341
plaintext_capacity);
408
342
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
343
perror("incbuffer");
410
344
plaintext_length = -1;
411
345
goto decrypt_end;
412
346
}
419
353
break;
420
354
}
421
355
if(ret < 0){
422
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
423
357
plaintext_length = -1;
424
358
goto decrypt_end;
425
359
}
482
416
}
483
417
484
418
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
486
420
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
488
425
safer_gnutls_strerror(ret));
489
426
gnutls_global_deinit();
490
427
return -1;
537
474
static int init_gnutls_session(gnutls_session_t *session){
538
475
int ret;
539
476
/* 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);
477
ret = gnutls_init(session, GNUTLS_SERVER);
546
478
if(ret != GNUTLS_E_SUCCESS){
547
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
480
safer_gnutls_strerror(ret));
550
482
551
483
{
552
484
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);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
560
486
if(ret != GNUTLS_E_SUCCESS){
561
487
fprintf(stderr, "Syntax error at: %s\n", err);
562
488
fprintf(stderr, "GnuTLS error: %s\n",
566
492
}
567
493
}
568
494
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);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
577
497
if(ret != GNUTLS_E_SUCCESS){
578
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
499
safer_gnutls_strerror(ret));
582
502
}
583
503
584
504
/* ignore client certificate if any. */
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
586
507
587
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
588
509
593
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
594
515
__attribute__((unused)) const char *txt){}
595
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
596
520
/* Called when a Mandos server is found */
597
521
static int start_mandos_communication(const char *ip, uint16_t port,
598
522
AvahiIfIndex if_index,
604
528
struct sockaddr_in6 in6;
605
529
} to;
606
530
char *buffer = NULL;
607
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
608
532
size_t buffer_length = 0;
609
533
size_t buffer_capacity = 0;
534
ssize_t decrypted_buffer_size;
610
535
size_t written;
611
int retval = -1;
536
int retval = 0;
612
537
gnutls_session_t session;
613
538
int pf; /* Protocol family */
614
539
615
errno = 0;
616
617
540
if(quit_now){
618
errno = EINTR;
619
541
return -1;
620
542
}
621
543
628
550
break;
629
551
default:
630
552
fprintf(stderr, "Bad address family: %d\n", af);
631
errno = EINVAL;
632
553
return -1;
633
554
}
634
555
644
565
645
566
tcp_sd = socket(pf, SOCK_STREAM, 0);
646
567
if(tcp_sd < 0){
647
int e = errno;
648
perror_plus("socket");
649
errno = e;
568
perror("socket");
569
retval = -1;
650
570
goto mandos_end;
651
571
}
652
572
653
573
if(quit_now){
654
errno = EINTR;
655
574
goto mandos_end;
656
575
}
657
576
664
583
ret = inet_pton(af, ip, &to.in.sin_addr);
665
584
}
666
585
if(ret < 0 ){
667
int e = errno;
668
perror_plus("inet_pton");
669
errno = e;
586
perror("inet_pton");
587
retval = -1;
670
588
goto mandos_end;
671
589
}
672
590
if(ret == 0){
673
int e = errno;
674
591
fprintf(stderr, "Bad address: %s\n", ip);
675
errno = e;
592
retval = -1;
676
593
goto mandos_end;
677
594
}
678
595
if(af == AF_INET6){
686
603
if(if_index == AVAHI_IF_UNSPEC){
687
604
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
605
" without a network interface\n");
689
errno = EINVAL;
606
retval = -1;
690
607
goto mandos_end;
691
608
}
692
609
/* Set the network interface number as scope */
699
616
}
700
617
701
618
if(quit_now){
702
errno = EINTR;
703
619
goto mandos_end;
704
620
}
705
621
707
623
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
624
char interface[IF_NAMESIZE];
709
625
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
626
perror("if_indextoname");
711
627
} else {
712
628
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
629
ip, interface, port);
727
643
sizeof(addrstr));
728
644
}
729
645
if(pcret == NULL){
730
perror_plus("inet_ntop");
646
perror("inet_ntop");
731
647
} else {
732
648
if(strcmp(addrstr, ip) != 0){
733
649
fprintf(stderr, "Canonical address form: %s\n", addrstr);
736
652
}
737
653
738
654
if(quit_now){
739
errno = EINTR;
740
655
goto mandos_end;
741
656
}
742
657
746
661
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
662
}
748
663
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
664
perror("connect");
665
retval = -1;
754
666
goto mandos_end;
755
667
}
756
668
757
669
if(quit_now){
758
errno = EINTR;
759
670
goto mandos_end;
760
671
}
761
672
766
677
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
678
out_size - written));
768
679
if(ret == -1){
769
int e = errno;
770
perror_plus("write");
771
errno = e;
680
perror("write");
681
retval = -1;
772
682
goto mandos_end;
773
683
}
774
684
written += (size_t)ret;
784
694
}
785
695
786
696
if(quit_now){
787
errno = EINTR;
788
697
goto mandos_end;
789
698
}
790
699
}
794
703
}
795
704
796
705
if(quit_now){
797
errno = EINTR;
798
706
goto mandos_end;
799
707
}
800
708
801
/* Spurious warning from -Wint-to-pointer-cast */
802
709
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
803
710
804
711
if(quit_now){
805
errno = EINTR;
806
712
goto mandos_end;
807
713
}
808
714
809
do {
715
do{
810
716
ret = gnutls_handshake(session);
811
717
if(quit_now){
812
errno = EINTR;
813
718
goto mandos_end;
814
719
}
815
720
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
819
724
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
820
725
gnutls_perror(ret);
821
726
}
822
errno = EPROTO;
727
retval = -1;
823
728
goto mandos_end;
824
729
}
825
730
833
738
while(true){
834
739
835
740
if(quit_now){
836
errno = EINTR;
837
741
goto mandos_end;
838
742
}
839
743
840
744
buffer_capacity = incbuffer(&buffer, buffer_length,
841
745
buffer_capacity);
842
746
if(buffer_capacity == 0){
843
int e = errno;
844
perror_plus("incbuffer");
845
errno = e;
747
perror("incbuffer");
748
retval = -1;
846
749
goto mandos_end;
847
750
}
848
751
849
752
if(quit_now){
850
errno = EINTR;
851
753
goto mandos_end;
852
754
}
853
755
862
764
case GNUTLS_E_AGAIN:
863
765
break;
864
766
case GNUTLS_E_REHANDSHAKE:
865
do {
767
do{
866
768
ret = gnutls_handshake(session);
867
769
868
770
if(quit_now){
869
errno = EINTR;
870
771
goto mandos_end;
871
772
}
872
773
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
774
if(ret < 0){
874
775
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
875
776
gnutls_perror(ret);
876
errno = EPROTO;
777
retval = -1;
877
778
goto mandos_end;
878
779
}
879
780
break;
880
781
default:
881
782
fprintf(stderr, "Unknown error while reading data from"
882
783
" encrypted session with Mandos server\n");
784
retval = -1;
883
785
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
885
786
goto mandos_end;
886
787
}
887
788
} else {
894
795
}
895
796
896
797
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);
798
goto mandos_end;
799
}
800
801
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
803
if(quit_now){
804
goto mandos_end;
805
}
908
806
909
807
if(buffer_length > 0){
910
ssize_t decrypted_buffer_size;
911
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
809
buffer_length,
913
810
&decrypted_buffer);
914
811
if(decrypted_buffer_size >= 0){
915
916
812
written = 0;
917
813
while(written < (size_t) decrypted_buffer_size){
918
814
if(quit_now){
919
errno = EINTR;
920
815
goto mandos_end;
921
816
}
922
817
924
819
(size_t)decrypted_buffer_size - written,
925
820
stdout);
926
821
if(ret == 0 and ferror(stdout)){
927
int e = errno;
928
822
if(debug){
929
823
fprintf(stderr, "Error writing encrypted data: %s\n",
930
824
strerror(errno));
931
825
}
932
errno = e;
933
goto mandos_end;
826
retval = -1;
827
break;
934
828
}
935
829
written += (size_t)ret;
936
830
}
937
retval = 0;
831
free(decrypted_buffer);
832
} else {
833
retval = -1;
938
834
}
835
} else {
836
retval = -1;
939
837
}
940
838
941
839
/* Shutdown procedure */
942
840
943
841
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
}
842
free(buffer);
843
if(tcp_sd >= 0){
844
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
845
}
846
if(ret == -1){
847
perror("close");
848
}
849
gnutls_deinit(session);
850
if(quit_now){
851
retval = -1;
963
852
}
964
853
return retval;
965
854
}
1008
897
avahi_proto_to_af(proto));
1009
898
if(ret == 0){
1010
899
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1014
900
}
1015
901
}
1016
902
}
1070
956
}
1071
957
}
1072
958
1073
/* Signal handler that stops main loop after SIGTERM */
959
/* stop main loop after sigterm has been called */
1074
960
static void handle_sigterm(int sig){
1075
961
if(quit_now){
1076
962
return;
1078
964
quit_now = 1;
1079
965
signal_received = sig;
1080
966
int old_errno = errno;
1081
/* set main loop to exit */
1082
967
if(mc.simple_poll != NULL){
1083
968
avahi_simple_poll_quit(mc.simple_poll);
1084
969
}
1085
970
errno = old_errno;
1086
971
}
1087
972
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
973
int main(int argc, char *argv[]){
1276
974
AvahiSServiceBrowser *sb = NULL;
1277
975
int error;
1279
977
intmax_t tmpmax;
1280
978
char *tmp;
1281
979
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
980
const char *interface = "eth0";
1283
981
struct ifreq network;
1284
982
int sd = -1;
1285
983
bool take_down_interface = false;
1286
984
uid_t uid;
1287
985
gid_t gid;
986
char *connect_to = NULL;
1288
987
char tempdir[] = "/tmp/mandosXXXXXX";
1289
988
bool tempdir_created = false;
1290
989
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1294
993
bool gnutls_initialized = false;
1295
994
bool gpgme_initialized = false;
1296
995
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1299
996
1300
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
997
struct sigaction old_sigterm_action;
1301
998
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1302
999
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
1000
{
1325
1001
struct argp_option options[] = {
1326
1002
{ .name = "debug", .key = 128,
1355
1031
.arg = "SECONDS",
1356
1032
.doc = "Maximum delay to wait for interface startup",
1357
1033
.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
1034
{ .name = NULL }
1372
1035
};
1373
1036
1374
1037
error_t parse_opt(int key, char *arg,
1375
1038
struct argp_state *state){
1376
errno = 0;
1377
1039
switch(key){
1378
1040
case 128: /* --debug */
1379
1041
debug = true;
1395
1057
tmpmax = strtoimax(arg, &tmp, 10);
1396
1058
if(errno != 0 or tmp == arg or *tmp != '\0'
1397
1059
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1398
argp_error(state, "Bad number of DH bits");
1060
fprintf(stderr, "Bad number of DH bits\n");
1061
exit(EXIT_FAILURE);
1399
1062
}
1400
1063
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1401
1064
break;
1406
1069
errno = 0;
1407
1070
delay = strtof(arg, &tmp);
1408
1071
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");
1072
fprintf(stderr, "Bad delay\n");
1073
exit(EXIT_FAILURE);
1418
1074
}
1419
1075
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);
1076
case ARGP_KEY_ARG:
1077
argp_usage(state);
1078
case ARGP_KEY_END:
1433
1079
break;
1434
1080
default:
1435
1081
return ARGP_ERR_UNKNOWN;
1436
1082
}
1437
return errno;
1083
return 0;
1438
1084
}
1439
1085
1440
1086
struct argp argp = { .options = options, .parser = parse_opt,
1441
1087
.args_doc = "",
1442
1088
.doc = "Mandos client -- Get and decrypt"
1443
1089
" 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");
1090
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1091
if(ret == ARGP_ERR_UNKNOWN){
1092
fprintf(stderr, "Unknown error while parsing arguments\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1518
1095
}
1519
1096
}
1520
1097
1521
1098
if(not debug){
1522
1099
avahi_set_log_function(empty_log);
1523
1100
}
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
1101
1550
1102
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
1103
from the signal handler */
1554
1106
mc.simple_poll = avahi_simple_poll_new();
1555
1107
if(mc.simple_poll == NULL){
1556
1108
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1557
exitcode = EX_UNAVAILABLE;
1109
exitcode = EXIT_FAILURE;
1558
1110
goto end;
1559
1111
}
1560
1112
1561
1113
sigemptyset(&sigterm_action.sa_mask);
1562
1114
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1563
1115
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1116
perror("sigaddset");
1117
exitcode = EXIT_FAILURE;
1566
1118
goto end;
1567
1119
}
1568
1120
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1569
1121
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1122
perror("sigaddset");
1123
exitcode = EXIT_FAILURE;
1572
1124
goto end;
1573
1125
}
1574
1126
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1575
1127
if(ret == -1){
1576
perror_plus("sigaddset");
1577
exitcode = EX_OSERR;
1128
perror("sigaddset");
1129
exitcode = EXIT_FAILURE;
1578
1130
goto end;
1579
1131
}
1580
1132
/* Need to check if the handler is SIG_IGN before handling:
1583
1135
*/
1584
1136
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1585
1137
if(ret == -1){
1586
perror_plus("sigaction");
1587
return EX_OSERR;
1138
perror("sigaction");
1139
return EXIT_FAILURE;
1588
1140
}
1589
1141
if(old_sigterm_action.sa_handler != SIG_IGN){
1590
1142
ret = sigaction(SIGINT, &sigterm_action, NULL);
1591
1143
if(ret == -1){
1592
perror_plus("sigaction");
1593
exitcode = EX_OSERR;
1144
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
1594
1146
goto end;
1595
1147
}
1596
1148
}
1597
1149
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1598
1150
if(ret == -1){
1599
perror_plus("sigaction");
1600
return EX_OSERR;
1151
perror("sigaction");
1152
return EXIT_FAILURE;
1601
1153
}
1602
1154
if(old_sigterm_action.sa_handler != SIG_IGN){
1603
1155
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1604
1156
if(ret == -1){
1605
perror_plus("sigaction");
1606
exitcode = EX_OSERR;
1157
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
1607
1159
goto end;
1608
1160
}
1609
1161
}
1610
1162
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1611
1163
if(ret == -1){
1612
perror_plus("sigaction");
1613
return EX_OSERR;
1164
perror("sigaction");
1165
return EXIT_FAILURE;
1614
1166
}
1615
1167
if(old_sigterm_action.sa_handler != SIG_IGN){
1616
1168
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1617
1169
if(ret == -1){
1618
perror_plus("sigaction");
1619
exitcode = EX_OSERR;
1170
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1620
1172
goto end;
1621
1173
}
1622
1174
}
1623
1175
1624
1176
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1177
if(interface[0] != '\0'){
1626
1178
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
1179
if(if_index == 0){
1628
1180
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1181
exitcode = EXIT_FAILURE;
1630
1182
goto end;
1631
1183
}
1632
1184
1634
1186
goto end;
1635
1187
}
1636
1188
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
1189
#ifdef __linux__
1645
1190
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1191
messages to mess up the prompt */
1647
1192
ret = klogctl(8, NULL, 5);
1648
1193
bool restore_loglevel = true;
1649
1194
if(ret == -1){
1650
1195
restore_loglevel = false;
1651
perror_plus("klogctl");
1196
perror("klogctl");
1652
1197
}
1653
1198
#endif /* __linux__ */
1654
1199
1655
1200
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
1201
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1202
perror("socket");
1203
exitcode = EXIT_FAILURE;
1659
1204
#ifdef __linux__
1660
1205
if(restore_loglevel){
1661
1206
ret = klogctl(7, NULL, 0);
1662
1207
if(ret == -1){
1663
perror_plus("klogctl");
1208
perror("klogctl");
1664
1209
}
1665
1210
}
1666
1211
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
1212
goto end;
1674
1213
}
1675
1214
strcpy(network.ifr_name, interface);
1676
1215
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
1216
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1217
perror("ioctl SIOCGIFFLAGS");
1679
1218
#ifdef __linux__
1680
1219
if(restore_loglevel){
1681
1220
ret = klogctl(7, NULL, 0);
1682
1221
if(ret == -1){
1683
perror_plus("klogctl");
1222
perror("klogctl");
1684
1223
}
1685
1224
}
1686
1225
#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
}
1226
exitcode = EXIT_FAILURE;
1694
1227
goto end;
1695
1228
}
1696
1229
if((network.ifr_flags & IFF_UP) == 0){
1699
1232
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
1233
if(ret == -1){
1701
1234
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1235
perror("ioctl SIOCSIFFLAGS");
1236
exitcode = EXIT_FAILURE;
1704
1237
#ifdef __linux__
1705
1238
if(restore_loglevel){
1706
1239
ret = klogctl(7, NULL, 0);
1707
1240
if(ret == -1){
1708
perror_plus("klogctl");
1241
perror("klogctl");
1709
1242
}
1710
1243
}
1711
1244
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
1245
goto end;
1719
1246
}
1720
1247
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1248
/* sleep checking until interface is running */
1723
1249
for(int i=0; i < delay * 4; i++){
1724
1250
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
1251
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1252
perror("ioctl SIOCGIFFLAGS");
1727
1253
} else if(network.ifr_flags & IFF_RUNNING){
1728
1254
break;
1729
1255
}
1730
1256
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
1257
ret = nanosleep(&sleeptime, NULL);
1732
1258
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1259
perror("nanosleep");
1734
1260
}
1735
1261
}
1736
1262
if(not take_down_interface){
1737
1263
/* We won't need the socket anymore */
1738
1264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
1265
if(ret == -1){
1740
perror_plus("close");
1266
perror("close");
1741
1267
}
1742
1268
}
1743
1269
#ifdef __linux__
1745
1271
/* Restores kernel loglevel to default */
1746
1272
ret = klogctl(7, NULL, 0);
1747
1273
if(ret == -1){
1748
perror_plus("klogctl");
1274
perror("klogctl");
1749
1275
}
1750
1276
}
1751
1277
#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
}
1278
}
1279
1280
if(quit_now){
1281
goto end;
1282
}
1283
1284
uid = getuid();
1285
gid = getgid();
1286
1287
errno = 0;
1288
setgid(gid);
1289
if(ret == -1){
1290
perror("setgid");
1291
}
1292
1293
ret = setuid(uid);
1294
if(ret == -1){
1295
perror("setuid");
1767
1296
}
1768
1297
1769
1298
if(quit_now){
1773
1302
ret = init_gnutls_global(pubkey, seckey);
1774
1303
if(ret == -1){
1775
1304
fprintf(stderr, "init_gnutls_global failed\n");
1776
exitcode = EX_UNAVAILABLE;
1305
exitcode = EXIT_FAILURE;
1777
1306
goto end;
1778
1307
} else {
1779
1308
gnutls_initialized = true;
1783
1312
goto end;
1784
1313
}
1785
1314
1315
tempdir_created = true;
1786
1316
if(mkdtemp(tempdir) == NULL){
1787
perror_plus("mkdtemp");
1317
tempdir_created = false;
1318
perror("mkdtemp");
1788
1319
goto end;
1789
1320
}
1790
tempdir_created = true;
1791
1321
1792
1322
if(quit_now){
1793
1323
goto end;
1795
1325
1796
1326
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
1327
fprintf(stderr, "init_gpgme failed\n");
1798
exitcode = EX_UNAVAILABLE;
1328
exitcode = EXIT_FAILURE;
1799
1329
goto end;
1800
1330
} else {
1801
1331
gpgme_initialized = true;
1811
1341
char *address = strrchr(connect_to, ':');
1812
1342
if(address == NULL){
1813
1343
fprintf(stderr, "No colon in address\n");
1814
exitcode = EX_USAGE;
1344
exitcode = EXIT_FAILURE;
1815
1345
goto end;
1816
1346
}
1817
1347
1825
1355
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
1356
or tmpmax != (uint16_t)tmpmax){
1827
1357
fprintf(stderr, "Bad port number\n");
1828
exitcode = EX_USAGE;
1358
exitcode = EXIT_FAILURE;
1829
1359
goto end;
1830
1360
}
1831
1361
1835
1365
1836
1366
port = (uint16_t)tmpmax;
1837
1367
*address = '\0';
1368
address = connect_to;
1838
1369
/* Colon in address indicates IPv6 */
1839
1370
int af;
1840
if(strchr(connect_to, ':') != NULL){
1371
if(strchr(address, ':') != NULL){
1841
1372
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
1373
} else {
1849
1374
af = AF_INET;
1850
1375
}
1851
address = connect_to;
1852
1376
1853
1377
if(quit_now){
1854
1378
goto end;
1855
1379
}
1856
1380
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){
1381
ret = start_mandos_communication(address, port, if_index, af);
1382
if(ret < 0){
1383
exitcode = EXIT_FAILURE;
1384
} else {
1870
1385
exitcode = EXIT_SUCCESS;
1871
1386
}
1872
1873
1387
goto end;
1874
1388
}
1875
1389
1899
1413
if(mc.server == NULL){
1900
1414
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
1415
avahi_strerror(error));
1902
exitcode = EX_UNAVAILABLE;
1416
exitcode = EXIT_FAILURE;
1903
1417
goto end;
1904
1418
}
1905
1419
1914
1428
if(sb == NULL){
1915
1429
fprintf(stderr, "Failed to create service browser: %s\n",
1916
1430
avahi_strerror(avahi_server_errno(mc.server)));
1917
exitcode = EX_UNAVAILABLE;
1431
exitcode = EXIT_FAILURE;
1918
1432
goto end;
1919
1433
}
1920
1434
1927
1441
if(debug){
1928
1442
fprintf(stderr, "Starting Avahi loop search\n");
1929
1443
}
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
}
1444
1445
avahi_simple_poll_loop(mc.simple_poll);
1937
1446
1938
1447
end:
1939
1448
1960
1469
if(gpgme_initialized){
1961
1470
gpgme_release(mc.ctx);
1962
1471
}
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
1472
1975
1473
/* Take down the network interface */
1976
1474
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1980
1476
if(ret == -1){
1981
perror_plus("seteuid");
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
if(ret == -1){
1482
perror("ioctl SIOCSIFFLAGS");
1483
}
1982
1484
}
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
}
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1486
if(ret == -1){
1487
perror("close");
2004
1488
}
2005
1489
}
2006
1490
2007
/* Removes the GPGME temp directory and all files inside */
1491
/* Removes the temp directory used by GPGME */
2008
1492
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];
1493
DIR *d;
1494
struct dirent *direntry;
1495
d = opendir(tempdir);
1496
if(d == NULL){
1497
if(errno != ENOENT){
1498
perror("opendir");
1499
}
1500
} else {
1501
while(true){
1502
direntry = readdir(d);
1503
if(direntry == NULL){
1504
break;
1505
}
1506
/* Skip "." and ".." */
1507
if(direntry->d_name[0] == '.'
1508
and (direntry->d_name[1] == '\0'
1509
or (direntry->d_name[1] == '.'
1510
and direntry->d_name[2] == '\0'))){
1511
continue;
1512
}
2016
1513
char *fullname = NULL;
2017
1514
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
1515
direntry->d_name);
2019
1516
if(ret < 0){
2020
perror_plus("asprintf");
1517
perror("asprintf");
2021
1518
continue;
2022
1519
}
2023
1520
ret = remove(fullname);
2027
1524
}
2028
1525
free(fullname);
2029
1526
}
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");
1527
closedir(d);
2036
1528
}
2037
1529
ret = rmdir(tempdir);
2038
1530
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
1531
perror("rmdir");
2040
1532
}
2041
1533
}
2042
1534
2043
1535
if(quit_now){
2044
1536
sigemptyset(&old_sigterm_action.sa_mask);
2045
1537
old_sigterm_action.sa_handler = SIG_DFL;
2046
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2047
&old_sigterm_action,
2048
NULL));
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2049
1539
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());
1540
perror("sigaction");
1541
}
1542
raise(signal_received);
2060
1543
}
2061
1544
2062
1545
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0