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- Committer: Teddy Hogeborn
- Date: 2009-02-09 19:33:46 UTC
- mfrom: (24.1.135 mandos)
- Revision ID: teddy@fukt.bsnet.se-20090209193346-5insyr1rsisor8dj
Merge from Björn:
* plugins.d/mandos-client.c (mc): Initialize globally.
(main): Better handling of signals.
* plugins.d/mandos-client.c (mc): Initialize globally.
(main): Better handling of signals.
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
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
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
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
61
#include <errno.h> /* perror(), errno */
66
62
#include <time.h> /* nanosleep(), time() */
71
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
68
*/
73
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
70
getuid(), getgid(), setuid(),
71
setgid() */
76
72
#include <arpa/inet.h> /* inet_pton(), htons */
77
73
#include <iso646.h> /* not, or, and */
78
74
#include <argp.h> /* struct argp_option, error_t, struct
80
76
argp_parse(), ARGP_KEY_ARG,
81
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
78
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
85
81
86
82
#ifdef __linux__
87
83
#include <sys/klog.h> /* klogctl() */
125
121
static const char mandos_protocol_version[] = "1";
126
122
const char *argp_program_version = "mandos-client " VERSION;
127
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
static const char sys_class_net[] = "/sys/class/net";
129
char *connect_to = NULL;
130
124
131
125
/* Used for passing in values through the Avahi callback functions */
132
126
typedef struct {
144
138
.dh_bits = 1024, .priority = "SECURE256"
145
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
140
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
150
141
/*
151
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
143
* bytes. "buffer_capacity" is how much is currently allocated,
169
160
*/
170
161
static bool init_gpgme(const char *seckey,
171
162
const char *pubkey, const char *tempdir){
163
int ret;
172
164
gpgme_error_t rc;
173
165
gpgme_engine_info_t engine_info;
174
166
177
169
* Helper function to insert pub and seckey to the engine keyring.
178
170
*/
179
171
bool import_key(const char *filename){
180
int ret;
181
172
int fd;
182
173
gpgme_data_t pgp_data;
183
174
254
245
return false;
255
246
}
256
247
257
return true;
248
return true;
258
249
}
259
250
260
251
/*
314
305
}
315
306
gpgme_recipient_t recipient;
316
307
recipient = result->recipients;
317
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
324
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
}
325
318
}
326
319
}
327
320
}
479
472
static int init_gnutls_session(gnutls_session_t *session){
480
473
int ret;
481
474
/* GnuTLS session creation */
482
do {
483
ret = gnutls_init(session, GNUTLS_SERVER);
484
if(quit_now){
485
return -1;
486
}
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
475
ret = gnutls_init(session, GNUTLS_SERVER);
488
476
if(ret != GNUTLS_E_SUCCESS){
489
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
478
safer_gnutls_strerror(ret));
492
480
493
481
{
494
482
const char *err;
495
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
if(quit_now){
498
gnutls_deinit(*session);
499
return -1;
500
}
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
502
484
if(ret != GNUTLS_E_SUCCESS){
503
485
fprintf(stderr, "Syntax error at: %s\n", err);
504
486
fprintf(stderr, "GnuTLS error: %s\n",
508
490
}
509
491
}
510
492
511
do {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
514
if(quit_now){
515
gnutls_deinit(*session);
516
return -1;
517
}
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
519
495
if(ret != GNUTLS_E_SUCCESS){
520
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
497
safer_gnutls_strerror(ret));
524
500
}
525
501
526
502
/* ignore client certificate if any. */
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
528
505
529
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
530
507
539
516
static int start_mandos_communication(const char *ip, uint16_t port,
540
517
AvahiIfIndex if_index,
541
518
int af){
542
int ret, tcp_sd = -1;
519
int ret, tcp_sd;
543
520
ssize_t sret;
544
521
union {
545
522
struct sockaddr_in in;
546
523
struct sockaddr_in6 in6;
547
524
} to;
548
525
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
550
527
size_t buffer_length = 0;
551
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
552
530
size_t written;
553
int retval = -1;
531
int retval = 0;
554
532
gnutls_session_t session;
555
533
int pf; /* Protocol family */
556
534
557
if(quit_now){
558
return -1;
559
}
560
561
535
switch(af){
562
536
case AF_INET6:
563
537
pf = PF_INET6;
583
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
558
if(tcp_sd < 0){
585
559
perror("socket");
586
goto mandos_end;
587
}
588
589
if(quit_now){
590
goto mandos_end;
560
return -1;
591
561
}
592
562
593
563
memset(&to, 0, sizeof(to));
594
564
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
596
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
597
567
} else { /* IPv4 */
598
568
to.in.sin_family = (sa_family_t)af;
600
570
}
601
571
if(ret < 0 ){
602
572
perror("inet_pton");
603
goto mandos_end;
573
return -1;
604
574
}
605
575
if(ret == 0){
606
576
fprintf(stderr, "Bad address: %s\n", ip);
607
goto mandos_end;
577
return -1;
608
578
}
609
579
if(af == AF_INET6){
610
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
617
587
if(if_index == AVAHI_IF_UNSPEC){
618
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
589
" without a network interface\n");
620
goto mandos_end;
590
return -1;
621
591
}
622
592
/* Set the network interface number as scope */
623
593
to.in6.sin6_scope_id = (uint32_t)if_index;
628
598
-Wunreachable-code */
629
599
}
630
600
631
if(quit_now){
632
goto mandos_end;
633
}
634
635
601
if(debug){
636
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
603
char interface[IF_NAMESIZE];
664
630
}
665
631
}
666
632
667
if(quit_now){
668
goto mandos_end;
669
}
670
671
633
if(af == AF_INET6){
672
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
673
635
} else {
675
637
}
676
638
if(ret < 0){
677
639
perror("connect");
678
goto mandos_end;
679
}
680
681
if(quit_now){
682
goto mandos_end;
640
return -1;
683
641
}
684
642
685
643
const char *out = mandos_protocol_version;
690
648
out_size - written));
691
649
if(ret == -1){
692
650
perror("write");
651
retval = -1;
693
652
goto mandos_end;
694
653
}
695
654
written += (size_t)ret;
703
662
break;
704
663
}
705
664
}
706
707
if(quit_now){
708
goto mandos_end;
709
}
710
665
}
711
666
712
667
if(debug){
713
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
714
669
}
715
670
716
if(quit_now){
717
goto mandos_end;
718
}
719
720
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
721
672
722
if(quit_now){
723
goto mandos_end;
724
}
725
726
do {
673
do{
727
674
ret = gnutls_handshake(session);
728
if(quit_now){
729
goto mandos_end;
730
}
731
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
732
676
733
677
if(ret != GNUTLS_E_SUCCESS){
735
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
736
680
gnutls_perror(ret);
737
681
}
682
retval = -1;
738
683
goto mandos_end;
739
684
}
740
685
746
691
}
747
692
748
693
while(true){
749
750
if(quit_now){
751
goto mandos_end;
752
}
753
754
694
buffer_capacity = incbuffer(&buffer, buffer_length,
755
695
buffer_capacity);
756
696
if(buffer_capacity == 0){
757
697
perror("incbuffer");
758
goto mandos_end;
759
}
760
761
if(quit_now){
698
retval = -1;
762
699
goto mandos_end;
763
700
}
764
701
773
710
case GNUTLS_E_AGAIN:
774
711
break;
775
712
case GNUTLS_E_REHANDSHAKE:
776
do {
713
do{
777
714
ret = gnutls_handshake(session);
778
779
if(quit_now){
780
goto mandos_end;
781
}
782
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
783
716
if(ret < 0){
784
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
785
718
gnutls_perror(ret);
719
retval = -1;
786
720
goto mandos_end;
787
721
}
788
722
break;
789
723
default:
790
724
fprintf(stderr, "Unknown error while reading data from"
791
725
" encrypted session with Mandos server\n");
726
retval = -1;
792
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
793
728
goto mandos_end;
794
729
}
801
736
fprintf(stderr, "Closing TLS session\n");
802
737
}
803
738
804
if(quit_now){
805
goto mandos_end;
806
}
807
808
do {
809
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
810
if(quit_now){
811
goto mandos_end;
812
}
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
814
740
815
741
if(buffer_length > 0){
816
ssize_t decrypted_buffer_size;
817
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
818
743
buffer_length,
819
744
&decrypted_buffer);
820
745
if(decrypted_buffer_size >= 0){
821
822
746
written = 0;
823
747
while(written < (size_t) decrypted_buffer_size){
824
if(quit_now){
825
goto mandos_end;
826
}
827
828
748
ret = (int)fwrite(decrypted_buffer + written, 1,
829
749
(size_t)decrypted_buffer_size - written,
830
750
stdout);
833
753
fprintf(stderr, "Error writing encrypted data: %s\n",
834
754
strerror(errno));
835
755
}
836
goto mandos_end;
756
retval = -1;
757
break;
837
758
}
838
759
written += (size_t)ret;
839
760
}
840
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
841
764
}
765
} else {
766
retval = -1;
842
767
}
843
768
844
769
/* Shutdown procedure */
845
770
846
771
mandos_end:
847
free(decrypted_buffer);
848
772
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
852
774
if(ret == -1){
853
775
perror("close");
854
776
}
855
777
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
859
778
return retval;
860
779
}
861
780
878
797
/* Called whenever a service has been resolved successfully or
879
798
timed out */
880
799
881
if(quit_now){
882
return;
883
}
884
885
800
switch(event){
886
801
default:
887
802
case AVAHI_RESOLVER_FAILURE:
924
839
/* Called whenever a new services becomes available on the LAN or
925
840
is removed from the LAN */
926
841
927
if(quit_now){
928
return;
929
}
930
931
842
switch(event){
932
843
default:
933
844
case AVAHI_BROWSER_FAILURE:
943
854
the callback function is called the Avahi server will free the
944
855
resolver for us. */
945
856
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
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)))
949
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
862
name, avahi_strerror(avahi_server_errno(mc.server)));
951
863
break;
962
874
}
963
875
}
964
876
877
sig_atomic_t quit_now = 0;
878
965
879
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
880
static void handle_sigterm(__attribute__((unused)) int sig){
967
881
if(quit_now){
968
882
return;
969
883
}
970
884
quit_now = 1;
971
signal_received = sig;
972
885
int old_errno = errno;
973
886
if(mc.simple_poll != NULL){
974
887
avahi_simple_poll_quit(mc.simple_poll);
976
889
errno = old_errno;
977
890
}
978
891
979
/*
980
* This function determines if a directory entry in /sys/class/net
981
* corresponds to an acceptable network device.
982
* (This function is passed to scandir(3) as a filter function.)
983
*/
984
int good_interface(const struct dirent *if_entry){
985
ssize_t ssret;
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
988
if_entry->d_name);
989
if(ret < 0){
990
perror("asprintf");
991
return 0;
992
}
993
if(if_entry->d_name[0] == '.'){
994
return 0;
995
}
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
997
if(flags_fd == -1){
998
perror("open");
999
return 0;
1000
}
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read);
1005
if(flagstring == NULL){
1006
perror("malloc");
1007
close(flags_fd);
1008
return 0;
1009
}
1010
while(to_read > 0){
1011
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1012
(size_t)to_read));
1013
if(ssret == -1){
1014
perror("read");
1015
free(flagstring);
1016
close(flags_fd);
1017
return 0;
1018
}
1019
to_read -= ssret;
1020
if(ssret == 0){
1021
break;
1022
}
1023
}
1024
close(flags_fd);
1025
intmax_t tmpmax;
1026
char *tmp;
1027
errno = 0;
1028
tmpmax = strtoimax(flagstring, &tmp, 0);
1029
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1030
and not (isspace(*tmp)))
1031
or tmpmax != (ifreq_flags)tmpmax){
1032
free(flagstring);
1033
return 0;
1034
}
1035
free(flagstring);
1036
ifreq_flags flags = (ifreq_flags)tmpmax;
1037
/* Reject the loopback device */
1038
if(flags & IFF_LOOPBACK){
1039
return 0;
1040
}
1041
/* Accept point-to-point devices only if connect_to is specified */
1042
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1043
return 1;
1044
}
1045
/* Otherwise, reject non-broadcast-capable devices */
1046
if(not (flags & IFF_BROADCAST)){
1047
return 0;
1048
}
1049
/* Accept this device */
1050
return 1;
1051
}
1052
1053
892
int main(int argc, char *argv[]){
1054
893
AvahiSServiceBrowser *sb = NULL;
1055
894
int error;
1056
895
int ret;
1057
896
intmax_t tmpmax;
1058
char *tmp;
897
int numchars;
1059
898
int exitcode = EXIT_SUCCESS;
1060
const char *interface = "";
899
const char *interface = "eth0";
1061
900
struct ifreq network;
1062
int sd = -1;
1063
bool take_down_interface = false;
901
int sd;
1064
902
uid_t uid;
1065
903
gid_t gid;
904
char *connect_to = NULL;
1066
905
char tempdir[] = "/tmp/mandosXXXXXX";
1067
906
bool tempdir_created = false;
1068
907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1069
908
const char *seckey = PATHDIR "/" SECKEY;
1070
909
const char *pubkey = PATHDIR "/" PUBKEY;
1071
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" };
1072
915
bool gnutls_initialized = false;
1073
916
bool gpgme_initialized = false;
1074
float delay = 2.5f;
1075
1076
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
917
double delay = 2.5;
918
919
struct sigaction old_sigterm_action;
1077
920
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1078
921
1079
uid = getuid();
1080
gid = getgid();
1081
1082
/* Lower any group privileges we might have, just to be safe */
1083
errno = 0;
1084
ret = setgid(gid);
1085
if(ret == -1){
1086
perror("setgid");
1087
}
1088
1089
/* Lower user privileges (temporarily) */
1090
errno = 0;
1091
ret = seteuid(uid);
1092
if(ret == -1){
1093
perror("seteuid");
1094
}
1095
1096
if(quit_now){
1097
goto end;
1098
}
1099
1100
922
{
1101
923
struct argp_option options[] = {
1102
924
{ .name = "debug", .key = 128,
1153
975
pubkey = arg;
1154
976
break;
1155
977
case 129: /* --dh-bits */
1156
errno = 0;
1157
tmpmax = strtoimax(arg, &tmp, 10);
1158
if(errno != 0 or tmp == arg or *tmp != '\0'
1159
or tmpmax != (typeof(mc.dh_bits))tmpmax){
978
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
979
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
980
or arg[numchars] != '\0'){
1160
981
fprintf(stderr, "Bad number of DH bits\n");
1161
982
exit(EXIT_FAILURE);
1162
983
}
1166
987
mc.priority = arg;
1167
988
break;
1168
989
case 131: /* --delay */
1169
errno = 0;
1170
delay = strtof(arg, &tmp);
1171
if(errno != 0 or tmp == arg or *tmp != '\0'){
990
ret = sscanf(arg, "%lf%n", &delay, &numchars);
991
if(ret < 1 or arg[numchars] != '\0'){
1172
992
fprintf(stderr, "Bad delay\n");
1173
993
exit(EXIT_FAILURE);
1174
994
}
1198
1018
if(not debug){
1199
1019
avahi_set_log_function(empty_log);
1200
1020
}
1201
1202
if(interface[0] == '\0'){
1203
struct dirent **direntries;
1204
ret = scandir(sys_class_net, &direntries, good_interface,
1205
alphasort);
1206
if(ret >= 1){
1207
/* Pick the first good interface */
1208
interface = strdup(direntries[0]->d_name);
1209
if(interface == NULL){
1210
perror("malloc");
1211
free(direntries);
1212
exitcode = EXIT_FAILURE;
1213
goto end;
1214
}
1215
free(direntries);
1216
} else {
1217
free(direntries);
1218
fprintf(stderr, "Could not find a network interface\n");
1219
exitcode = EXIT_FAILURE;
1220
goto end;
1221
}
1222
}
1223
1021
1224
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1225
1023
from the signal handler */
1251
1049
exitcode = EXIT_FAILURE;
1252
1050
goto end;
1253
1051
}
1254
/* Need to check if the handler is SIG_IGN before handling:
1255
| [[info:libc:Initial Signal Actions]] |
1256
| [[info:libc:Basic Signal Handling]] |
1257
*/
1258
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1259
if(ret == -1){
1260
perror("sigaction");
1261
return EXIT_FAILURE;
1262
}
1263
if(old_sigterm_action.sa_handler != SIG_IGN){
1264
ret = sigaction(SIGINT, &sigterm_action, NULL);
1265
if(ret == -1){
1266
perror("sigaction");
1267
exitcode = EXIT_FAILURE;
1268
goto end;
1269
}
1270
}
1271
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1272
if(ret == -1){
1273
perror("sigaction");
1274
return EXIT_FAILURE;
1275
}
1276
if(old_sigterm_action.sa_handler != SIG_IGN){
1277
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1278
if(ret == -1){
1279
perror("sigaction");
1280
exitcode = EXIT_FAILURE;
1281
goto end;
1282
}
1283
}
1284
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1285
if(ret == -1){
1286
perror("sigaction");
1287
return EXIT_FAILURE;
1288
}
1289
if(old_sigterm_action.sa_handler != SIG_IGN){
1290
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1291
if(ret == -1){
1292
perror("sigaction");
1293
exitcode = EXIT_FAILURE;
1294
goto end;
1295
}
1296
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1297
1058
1298
1059
/* If the interface is down, bring it up */
1299
if(strcmp(interface, "none") != 0){
1300
if_index = (AvahiIfIndex) if_nametoindex(interface);
1301
if(if_index == 0){
1302
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1303
exitcode = EXIT_FAILURE;
1304
goto end;
1305
}
1306
1307
if(quit_now){
1308
goto end;
1309
}
1310
1311
/* Re-raise priviliges */
1312
errno = 0;
1313
ret = seteuid(0);
1314
if(ret == -1){
1315
perror("seteuid");
1316
}
1317
1060
if(interface[0] != '\0'){
1318
1061
#ifdef __linux__
1319
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1320
1063
messages to mess up the prompt */
1338
1081
}
1339
1082
}
1340
1083
#endif /* __linux__ */
1341
/* Lower privileges */
1342
errno = 0;
1343
ret = seteuid(uid);
1344
if(ret == -1){
1345
perror("seteuid");
1346
}
1347
1084
goto end;
1348
1085
}
1349
1086
strcpy(network.ifr_name, interface);
1359
1096
}
1360
1097
#endif /* __linux__ */
1361
1098
exitcode = EXIT_FAILURE;
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
1099
goto end;
1369
1100
}
1370
1101
if((network.ifr_flags & IFF_UP) == 0){
1371
1102
network.ifr_flags |= IFF_UP;
1372
take_down_interface = true;
1373
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1374
1104
if(ret == -1){
1375
take_down_interface = false;
1376
1105
perror("ioctl SIOCSIFFLAGS");
1377
1106
exitcode = EXIT_FAILURE;
1378
1107
#ifdef __linux__
1383
1112
}
1384
1113
}
1385
1114
#endif /* __linux__ */
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
1115
goto end;
1393
1116
}
1394
1117
}
1406
1129
perror("nanosleep");
1407
1130
}
1408
1131
}
1409
if(not take_down_interface){
1410
/* We won't need the socket anymore */
1411
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1412
if(ret == -1){
1413
perror("close");
1414
}
1132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1133
if(ret == -1){
1134
perror("close");
1415
1135
}
1416
1136
#ifdef __linux__
1417
1137
if(restore_loglevel){
1422
1142
}
1423
1143
}
1424
1144
#endif /* __linux__ */
1425
/* Lower privileges */
1426
errno = 0;
1427
if(take_down_interface){
1428
/* Lower privileges */
1429
ret = seteuid(uid);
1430
if(ret == -1){
1431
perror("seteuid");
1432
}
1433
} else {
1434
/* Lower privileges permanently */
1435
ret = setuid(uid);
1436
if(ret == -1){
1437
perror("setuid");
1438
}
1439
}
1440
}
1441
1442
if(quit_now){
1443
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");
1444
1159
}
1445
1160
1446
1161
ret = init_gnutls_global(pubkey, seckey);
1452
1167
gnutls_initialized = true;
1453
1168
}
1454
1169
1455
if(quit_now){
1456
goto end;
1457
}
1458
1459
tempdir_created = true;
1460
1170
if(mkdtemp(tempdir) == NULL){
1461
tempdir_created = false;
1462
1171
perror("mkdtemp");
1463
1172
goto end;
1464
1173
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1174
tempdir_created = true;
1469
1175
1470
1176
if(not init_gpgme(pubkey, seckey, tempdir)){
1471
1177
fprintf(stderr, "init_gpgme failed\n");
1475
1181
gpgme_initialized = true;
1476
1182
}
1477
1183
1478
if(quit_now){
1479
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
}
1480
1191
}
1481
1192
1482
1193
if(connect_to != NULL){
1488
1199
exitcode = EXIT_FAILURE;
1489
1200
goto end;
1490
1201
}
1491
1492
if(quit_now){
1493
goto end;
1494
}
1495
1496
1202
uint16_t port;
1497
errno = 0;
1498
tmpmax = strtoimax(address+1, &tmp, 10);
1499
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1500
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'){
1501
1206
fprintf(stderr, "Bad port number\n");
1502
1207
exitcode = EXIT_FAILURE;
1503
1208
goto end;
1504
1209
}
1505
1506
if(quit_now){
1507
goto end;
1508
}
1509
1510
1210
port = (uint16_t)tmpmax;
1511
1211
*address = '\0';
1512
1212
address = connect_to;
1517
1217
} else {
1518
1218
af = AF_INET;
1519
1219
}
1520
1521
if(quit_now){
1522
goto end;
1523
}
1524
1525
1220
ret = start_mandos_communication(address, port, if_index, af);
1526
1221
if(ret < 0){
1527
1222
exitcode = EXIT_FAILURE;
1530
1225
}
1531
1226
goto end;
1532
1227
}
1533
1534
if(quit_now){
1535
goto end;
1536
}
1537
1228
1538
1229
{
1539
1230
AvahiServerConfig config;
1540
1231
/* Do not publish any local Zeroconf records */
1561
1252
goto end;
1562
1253
}
1563
1254
1564
if(quit_now){
1565
goto end;
1566
}
1567
1568
1255
/* Create the Avahi service browser */
1569
1256
sb = avahi_s_service_browser_new(mc.server, if_index,
1570
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1257
AVAHI_PROTO_INET6, "_mandos._tcp",
1571
1258
NULL, 0, browse_callback, NULL);
1572
1259
if(sb == NULL){
1573
1260
fprintf(stderr, "Failed to create service browser: %s\n",
1576
1263
goto end;
1577
1264
}
1578
1265
1579
if(quit_now){
1580
goto end;
1581
}
1582
1583
1266
/* Run the main loop */
1584
1267
1585
1268
if(debug){
1614
1297
gpgme_release(mc.ctx);
1615
1298
}
1616
1299
1617
/* Take down the network interface */
1618
if(take_down_interface){
1619
/* Re-raise priviliges */
1620
errno = 0;
1621
ret = seteuid(0);
1622
if(ret == -1){
1623
perror("seteuid");
1624
}
1625
if(geteuid() == 0){
1626
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1627
if(ret == -1){
1628
perror("ioctl SIOCGIFFLAGS");
1629
} else if(network.ifr_flags & IFF_UP) {
1630
network.ifr_flags &= ~IFF_UP; /* clear flag */
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1632
if(ret == -1){
1633
perror("ioctl SIOCSIFFLAGS");
1634
}
1635
}
1636
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1637
if(ret == -1){
1638
perror("close");
1639
}
1640
/* Lower privileges permanently */
1641
errno = 0;
1642
ret = setuid(uid);
1643
if(ret == -1){
1644
perror("setuid");
1645
}
1646
}
1647
}
1648
1649
1300
/* Removes the temp directory used by GPGME */
1650
1301
if(tempdir_created){
1651
1302
DIR *d;
1690
1341
}
1691
1342
}
1692
1343
1693
if(quit_now){
1694
sigemptyset(&old_sigterm_action.sa_mask);
1695
old_sigterm_action.sa_handler = SIG_DFL;
1696
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1697
&old_sigterm_action,
1698
NULL));
1699
if(ret == -1){
1700
perror("sigaction");
1701
}
1702
do {
1703
ret = raise(signal_received);
1704
} while(ret != 0 and errno == EINTR);
1705
if(ret != 0){
1706
perror("raise");
1707
abort();
1708
}
1709
TEMP_FAILURE_RETRY(pause());
1710
}
1711
1712
1344
return exitcode;
1713
1345
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0