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- Committer: Teddy Hogeborn
- Date: 2009-02-09 19:26:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090209192619-7rse82x9pypq4ihk
* plugin-runner.c: Comment change.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
- 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 {
140
134
} mandos_context;
141
135
142
136
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
137
mandos_context mc;
149
138
150
139
/*
151
140
* Make additional room in "buffer" for at least BUFFER_SIZE more
169
158
*/
170
159
static bool init_gpgme(const char *seckey,
171
160
const char *pubkey, const char *tempdir){
161
int ret;
172
162
gpgme_error_t rc;
173
163
gpgme_engine_info_t engine_info;
174
164
177
167
* Helper function to insert pub and seckey to the engine keyring.
178
168
*/
179
169
bool import_key(const char *filename){
180
int ret;
181
170
int fd;
182
171
gpgme_data_t pgp_data;
183
172
254
243
return false;
255
244
}
256
245
257
return true;
246
return true;
258
247
}
259
248
260
249
/*
314
303
}
315
304
gpgme_recipient_t recipient;
316
305
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;
306
if(recipient){
307
while(recipient != NULL){
308
fprintf(stderr, "Public key algorithm: %s\n",
309
gpgme_pubkey_algo_name(recipient->pubkey_algo));
310
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
311
fprintf(stderr, "Secret key available: %s\n",
312
recipient->status == GPG_ERR_NO_SECKEY
313
? "No" : "Yes");
314
recipient = recipient->next;
315
}
325
316
}
326
317
}
327
318
}
479
470
static int init_gnutls_session(gnutls_session_t *session){
480
471
int ret;
481
472
/* 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);
473
ret = gnutls_init(session, GNUTLS_SERVER);
488
474
if(ret != GNUTLS_E_SUCCESS){
489
475
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
476
safer_gnutls_strerror(ret));
492
478
493
479
{
494
480
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);
481
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
502
482
if(ret != GNUTLS_E_SUCCESS){
503
483
fprintf(stderr, "Syntax error at: %s\n", err);
504
484
fprintf(stderr, "GnuTLS error: %s\n",
508
488
}
509
489
}
510
490
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);
491
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
492
mc.cred);
519
493
if(ret != GNUTLS_E_SUCCESS){
520
494
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
495
safer_gnutls_strerror(ret));
524
498
}
525
499
526
500
/* ignore client certificate if any. */
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
501
gnutls_certificate_server_set_request(*session,
502
GNUTLS_CERT_IGNORE);
528
503
529
504
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
530
505
539
514
static int start_mandos_communication(const char *ip, uint16_t port,
540
515
AvahiIfIndex if_index,
541
516
int af){
542
int ret, tcp_sd = -1;
517
int ret, tcp_sd;
543
518
ssize_t sret;
544
519
union {
545
520
struct sockaddr_in in;
546
521
struct sockaddr_in6 in6;
547
522
} to;
548
523
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
524
char *decrypted_buffer;
550
525
size_t buffer_length = 0;
551
526
size_t buffer_capacity = 0;
527
ssize_t decrypted_buffer_size;
552
528
size_t written;
553
int retval = -1;
529
int retval = 0;
554
530
gnutls_session_t session;
555
531
int pf; /* Protocol family */
556
532
557
if(quit_now){
558
return -1;
559
}
560
561
533
switch(af){
562
534
case AF_INET6:
563
535
pf = PF_INET6;
583
555
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
556
if(tcp_sd < 0){
585
557
perror("socket");
586
goto mandos_end;
587
}
588
589
if(quit_now){
590
goto mandos_end;
558
return -1;
591
559
}
592
560
593
561
memset(&to, 0, sizeof(to));
594
562
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
563
to.in6.sin6_family = (uint16_t)af;
596
564
ret = inet_pton(af, ip, &to.in6.sin6_addr);
597
565
} else { /* IPv4 */
598
566
to.in.sin_family = (sa_family_t)af;
600
568
}
601
569
if(ret < 0 ){
602
570
perror("inet_pton");
603
goto mandos_end;
571
return -1;
604
572
}
605
573
if(ret == 0){
606
574
fprintf(stderr, "Bad address: %s\n", ip);
607
goto mandos_end;
575
return -1;
608
576
}
609
577
if(af == AF_INET6){
610
578
to.in6.sin6_port = htons(port); /* Spurious warnings from
617
585
if(if_index == AVAHI_IF_UNSPEC){
618
586
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
587
" without a network interface\n");
620
goto mandos_end;
588
return -1;
621
589
}
622
590
/* Set the network interface number as scope */
623
591
to.in6.sin6_scope_id = (uint32_t)if_index;
628
596
-Wunreachable-code */
629
597
}
630
598
631
if(quit_now){
632
goto mandos_end;
633
}
634
635
599
if(debug){
636
600
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
601
char interface[IF_NAMESIZE];
664
628
}
665
629
}
666
630
667
if(quit_now){
668
goto mandos_end;
669
}
670
671
631
if(af == AF_INET6){
672
632
ret = connect(tcp_sd, &to.in6, sizeof(to));
673
633
} else {
675
635
}
676
636
if(ret < 0){
677
637
perror("connect");
678
goto mandos_end;
679
}
680
681
if(quit_now){
682
goto mandos_end;
638
return -1;
683
639
}
684
640
685
641
const char *out = mandos_protocol_version;
690
646
out_size - written));
691
647
if(ret == -1){
692
648
perror("write");
649
retval = -1;
693
650
goto mandos_end;
694
651
}
695
652
written += (size_t)ret;
703
660
break;
704
661
}
705
662
}
706
707
if(quit_now){
708
goto mandos_end;
709
}
710
663
}
711
664
712
665
if(debug){
713
666
fprintf(stderr, "Establishing TLS session with %s\n", ip);
714
667
}
715
668
716
if(quit_now){
717
goto mandos_end;
718
}
719
720
669
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
721
670
722
if(quit_now){
723
goto mandos_end;
724
}
725
726
do {
671
do{
727
672
ret = gnutls_handshake(session);
728
if(quit_now){
729
goto mandos_end;
730
}
731
673
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
732
674
733
675
if(ret != GNUTLS_E_SUCCESS){
735
677
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
736
678
gnutls_perror(ret);
737
679
}
680
retval = -1;
738
681
goto mandos_end;
739
682
}
740
683
746
689
}
747
690
748
691
while(true){
749
750
if(quit_now){
751
goto mandos_end;
752
}
753
754
692
buffer_capacity = incbuffer(&buffer, buffer_length,
755
693
buffer_capacity);
756
694
if(buffer_capacity == 0){
757
695
perror("incbuffer");
758
goto mandos_end;
759
}
760
761
if(quit_now){
696
retval = -1;
762
697
goto mandos_end;
763
698
}
764
699
773
708
case GNUTLS_E_AGAIN:
774
709
break;
775
710
case GNUTLS_E_REHANDSHAKE:
776
do {
711
do{
777
712
ret = gnutls_handshake(session);
778
779
if(quit_now){
780
goto mandos_end;
781
}
782
713
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
783
714
if(ret < 0){
784
715
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
785
716
gnutls_perror(ret);
717
retval = -1;
786
718
goto mandos_end;
787
719
}
788
720
break;
789
721
default:
790
722
fprintf(stderr, "Unknown error while reading data from"
791
723
" encrypted session with Mandos server\n");
724
retval = -1;
792
725
gnutls_bye(session, GNUTLS_SHUT_RDWR);
793
726
goto mandos_end;
794
727
}
801
734
fprintf(stderr, "Closing TLS session\n");
802
735
}
803
736
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);
737
gnutls_bye(session, GNUTLS_SHUT_RDWR);
814
738
815
739
if(buffer_length > 0){
816
ssize_t decrypted_buffer_size;
817
740
decrypted_buffer_size = pgp_packet_decrypt(buffer,
818
741
buffer_length,
819
742
&decrypted_buffer);
820
743
if(decrypted_buffer_size >= 0){
821
822
744
written = 0;
823
745
while(written < (size_t) decrypted_buffer_size){
824
if(quit_now){
825
goto mandos_end;
826
}
827
828
746
ret = (int)fwrite(decrypted_buffer + written, 1,
829
747
(size_t)decrypted_buffer_size - written,
830
748
stdout);
833
751
fprintf(stderr, "Error writing encrypted data: %s\n",
834
752
strerror(errno));
835
753
}
836
goto mandos_end;
754
retval = -1;
755
break;
837
756
}
838
757
written += (size_t)ret;
839
758
}
840
retval = 0;
759
free(decrypted_buffer);
760
} else {
761
retval = -1;
841
762
}
763
} else {
764
retval = -1;
842
765
}
843
766
844
767
/* Shutdown procedure */
845
768
846
769
mandos_end:
847
free(decrypted_buffer);
848
770
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
771
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
852
772
if(ret == -1){
853
773
perror("close");
854
774
}
855
775
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
859
776
return retval;
860
777
}
861
778
878
795
/* Called whenever a service has been resolved successfully or
879
796
timed out */
880
797
881
if(quit_now){
882
return;
883
}
884
885
798
switch(event){
886
799
default:
887
800
case AVAHI_RESOLVER_FAILURE:
924
837
/* Called whenever a new services becomes available on the LAN or
925
838
is removed from the LAN */
926
839
927
if(quit_now){
928
return;
929
}
930
931
840
switch(event){
932
841
default:
933
842
case AVAHI_BROWSER_FAILURE:
943
852
the callback function is called the Avahi server will free the
944
853
resolver for us. */
945
854
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
855
if(!(avahi_s_service_resolver_new(mc.server, interface,
856
protocol, name, type, domain,
857
AVAHI_PROTO_INET6, 0,
858
resolve_callback, NULL)))
949
859
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
860
name, avahi_strerror(avahi_server_errno(mc.server)));
951
861
break;
962
872
}
963
873
}
964
874
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
875
sig_atomic_t quit_now = 0;
876
877
static void handle_sigterm(__attribute__((unused)) int sig){
967
878
if(quit_now){
968
879
return;
969
880
}
970
881
quit_now = 1;
971
signal_received = sig;
972
882
int old_errno = errno;
973
883
if(mc.simple_poll != NULL){
974
884
avahi_simple_poll_quit(mc.simple_poll);
976
886
errno = old_errno;
977
887
}
978
888
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+1); /* +1 for final \0 */
1005
flagstring[(size_t)to_read] = '\0';
1006
if(flagstring == NULL){
1007
perror("malloc");
1008
close(flags_fd);
1009
return 0;
1010
}
1011
while(to_read > 0){
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1013
(size_t)to_read));
1014
if(ssret == -1){
1015
perror("read");
1016
free(flagstring);
1017
close(flags_fd);
1018
return 0;
1019
}
1020
to_read -= ssret;
1021
if(ssret == 0){
1022
break;
1023
}
1024
}
1025
close(flags_fd);
1026
intmax_t tmpmax;
1027
char *tmp;
1028
errno = 0;
1029
tmpmax = strtoimax(flagstring, &tmp, 0);
1030
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1031
and not (isspace(*tmp)))
1032
or tmpmax != (ifreq_flags)tmpmax){
1033
if(debug){
1034
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1035
flagstring, if_entry->d_name);
1036
}
1037
free(flagstring);
1038
return 0;
1039
}
1040
free(flagstring);
1041
ifreq_flags flags = (ifreq_flags)tmpmax;
1042
/* Reject the loopback device */
1043
if(flags & IFF_LOOPBACK){
1044
if(debug){
1045
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1046
if_entry->d_name);
1047
}
1048
return 0;
1049
}
1050
/* Accept point-to-point devices only if connect_to is specified */
1051
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1052
if(debug){
1053
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1054
if_entry->d_name);
1055
}
1056
return 1;
1057
}
1058
/* Otherwise, reject non-broadcast-capable devices */
1059
if(not (flags & IFF_BROADCAST)){
1060
if(debug){
1061
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1062
if_entry->d_name);
1063
}
1064
return 0;
1065
}
1066
/* Accept this device */
1067
if(debug){
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1069
if_entry->d_name);
1070
}
1071
return 1;
1072
}
1073
1074
889
int main(int argc, char *argv[]){
1075
890
AvahiSServiceBrowser *sb = NULL;
1076
891
int error;
1077
892
int ret;
1078
893
intmax_t tmpmax;
1079
char *tmp;
894
int numchars;
1080
895
int exitcode = EXIT_SUCCESS;
1081
const char *interface = "";
896
const char *interface = "eth0";
1082
897
struct ifreq network;
1083
int sd = -1;
1084
bool take_down_interface = false;
898
int sd;
1085
899
uid_t uid;
1086
900
gid_t gid;
901
char *connect_to = NULL;
1087
902
char tempdir[] = "/tmp/mandosXXXXXX";
1088
903
bool tempdir_created = false;
1089
904
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1090
905
const char *seckey = PATHDIR "/" SECKEY;
1091
906
const char *pubkey = PATHDIR "/" PUBKEY;
1092
907
908
/* Initialize Mandos context */
909
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
910
.dh_bits = 1024, .priority = "SECURE256"
911
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1093
912
bool gnutls_initialized = false;
1094
913
bool gpgme_initialized = false;
1095
float delay = 2.5f;
1096
1097
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
914
double delay = 2.5;
915
916
struct sigaction old_sigterm_action;
1098
917
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1099
918
1100
uid = getuid();
1101
gid = getgid();
1102
1103
/* Lower any group privileges we might have, just to be safe */
1104
errno = 0;
1105
ret = setgid(gid);
1106
if(ret == -1){
1107
perror("setgid");
1108
}
1109
1110
/* Lower user privileges (temporarily) */
1111
errno = 0;
1112
ret = seteuid(uid);
1113
if(ret == -1){
1114
perror("seteuid");
1115
}
1116
1117
if(quit_now){
1118
goto end;
1119
}
1120
1121
919
{
1122
920
struct argp_option options[] = {
1123
921
{ .name = "debug", .key = 128,
1174
972
pubkey = arg;
1175
973
break;
1176
974
case 129: /* --dh-bits */
1177
errno = 0;
1178
tmpmax = strtoimax(arg, &tmp, 10);
1179
if(errno != 0 or tmp == arg or *tmp != '\0'
1180
or tmpmax != (typeof(mc.dh_bits))tmpmax){
975
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
976
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
977
or arg[numchars] != '\0'){
1181
978
fprintf(stderr, "Bad number of DH bits\n");
1182
979
exit(EXIT_FAILURE);
1183
980
}
1187
984
mc.priority = arg;
1188
985
break;
1189
986
case 131: /* --delay */
1190
errno = 0;
1191
delay = strtof(arg, &tmp);
1192
if(errno != 0 or tmp == arg or *tmp != '\0'){
987
ret = sscanf(arg, "%lf%n", &delay, &numchars);
988
if(ret < 1 or arg[numchars] != '\0'){
1193
989
fprintf(stderr, "Bad delay\n");
1194
990
exit(EXIT_FAILURE);
1195
991
}
1216
1012
}
1217
1013
}
1218
1014
1219
if(not debug){
1220
avahi_set_log_function(empty_log);
1221
}
1222
1223
if(interface[0] == '\0'){
1224
struct dirent **direntries;
1225
ret = scandir(sys_class_net, &direntries, good_interface,
1226
alphasort);
1227
if(ret >= 1){
1228
/* Pick the first good interface */
1229
interface = strdup(direntries[0]->d_name);
1230
if(debug){
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1232
}
1233
if(interface == NULL){
1234
perror("malloc");
1235
free(direntries);
1236
exitcode = EXIT_FAILURE;
1237
goto end;
1238
}
1239
free(direntries);
1240
} else {
1241
free(direntries);
1242
fprintf(stderr, "Could not find a network interface\n");
1243
exitcode = EXIT_FAILURE;
1244
goto end;
1245
}
1246
}
1247
1248
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1249
from the signal handler */
1250
/* Initialize the pseudo-RNG for Avahi */
1251
srand((unsigned int) time(NULL));
1252
mc.simple_poll = avahi_simple_poll_new();
1253
if(mc.simple_poll == NULL){
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1255
exitcode = EXIT_FAILURE;
1256
goto end;
1257
}
1258
1259
sigemptyset(&sigterm_action.sa_mask);
1260
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1261
if(ret == -1){
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
1264
goto end;
1265
}
1266
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1267
if(ret == -1){
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
1270
goto end;
1271
}
1272
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1273
if(ret == -1){
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
1276
goto end;
1277
}
1278
/* Need to check if the handler is SIG_IGN before handling:
1279
| [[info:libc:Initial Signal Actions]] |
1280
| [[info:libc:Basic Signal Handling]] |
1281
*/
1282
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1283
if(ret == -1){
1284
perror("sigaction");
1285
return EXIT_FAILURE;
1286
}
1287
if(old_sigterm_action.sa_handler != SIG_IGN){
1288
ret = sigaction(SIGINT, &sigterm_action, NULL);
1289
if(ret == -1){
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
1292
goto end;
1293
}
1294
}
1295
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1296
if(ret == -1){
1297
perror("sigaction");
1298
return EXIT_FAILURE;
1299
}
1300
if(old_sigterm_action.sa_handler != SIG_IGN){
1301
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1302
if(ret == -1){
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
1305
goto end;
1306
}
1307
}
1308
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1309
if(ret == -1){
1310
perror("sigaction");
1311
return EXIT_FAILURE;
1312
}
1313
if(old_sigterm_action.sa_handler != SIG_IGN){
1314
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1315
if(ret == -1){
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1318
goto end;
1319
}
1320
}
1321
1322
1015
/* If the interface is down, bring it up */
1323
if(strcmp(interface, "none") != 0){
1324
if_index = (AvahiIfIndex) if_nametoindex(interface);
1325
if(if_index == 0){
1326
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1327
exitcode = EXIT_FAILURE;
1328
goto end;
1329
}
1330
1331
if(quit_now){
1332
goto end;
1333
}
1334
1335
/* Re-raise priviliges */
1336
errno = 0;
1337
ret = seteuid(0);
1338
if(ret == -1){
1339
perror("seteuid");
1340
}
1341
1016
if(interface[0] != '\0'){
1342
1017
#ifdef __linux__
1343
1018
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1344
1019
messages to mess up the prompt */
1362
1037
}
1363
1038
}
1364
1039
#endif /* __linux__ */
1365
/* Lower privileges */
1366
errno = 0;
1367
ret = seteuid(uid);
1368
if(ret == -1){
1369
perror("seteuid");
1370
}
1371
1040
goto end;
1372
1041
}
1373
1042
strcpy(network.ifr_name, interface);
1383
1052
}
1384
1053
#endif /* __linux__ */
1385
1054
exitcode = EXIT_FAILURE;
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
1055
goto end;
1393
1056
}
1394
1057
if((network.ifr_flags & IFF_UP) == 0){
1395
1058
network.ifr_flags |= IFF_UP;
1396
take_down_interface = true;
1397
1059
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1398
1060
if(ret == -1){
1399
take_down_interface = false;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1061
perror("ioctl SIOCSIFFLAGS");
1401
1062
exitcode = EXIT_FAILURE;
1402
1063
#ifdef __linux__
1403
1064
if(restore_loglevel){
1407
1068
}
1408
1069
}
1409
1070
#endif /* __linux__ */
1410
/* Lower privileges */
1411
errno = 0;
1412
ret = seteuid(uid);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1071
goto end;
1417
1072
}
1418
1073
}
1430
1085
perror("nanosleep");
1431
1086
}
1432
1087
}
1433
if(not take_down_interface){
1434
/* We won't need the socket anymore */
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1436
if(ret == -1){
1437
perror("close");
1438
}
1088
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1089
if(ret == -1){
1090
perror("close");
1439
1091
}
1440
1092
#ifdef __linux__
1441
1093
if(restore_loglevel){
1446
1098
}
1447
1099
}
1448
1100
#endif /* __linux__ */
1449
/* Lower privileges */
1450
errno = 0;
1451
if(take_down_interface){
1452
/* Lower privileges */
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror("seteuid");
1456
}
1457
} else {
1458
/* Lower privileges permanently */
1459
ret = setuid(uid);
1460
if(ret == -1){
1461
perror("setuid");
1462
}
1463
}
1464
}
1465
1466
if(quit_now){
1467
goto end;
1101
}
1102
1103
uid = getuid();
1104
gid = getgid();
1105
1106
errno = 0;
1107
setgid(gid);
1108
if(ret == -1){
1109
perror("setgid");
1110
}
1111
1112
ret = setuid(uid);
1113
if(ret == -1){
1114
perror("setuid");
1468
1115
}
1469
1116
1470
1117
ret = init_gnutls_global(pubkey, seckey);
1476
1123
gnutls_initialized = true;
1477
1124
}
1478
1125
1479
if(quit_now){
1480
goto end;
1481
}
1482
1483
tempdir_created = true;
1484
1126
if(mkdtemp(tempdir) == NULL){
1485
tempdir_created = false;
1486
1127
perror("mkdtemp");
1487
1128
goto end;
1488
1129
}
1489
1490
if(quit_now){
1491
goto end;
1492
}
1130
tempdir_created = true;
1493
1131
1494
1132
if(not init_gpgme(pubkey, seckey, tempdir)){
1495
1133
fprintf(stderr, "init_gpgme failed\n");
1499
1137
gpgme_initialized = true;
1500
1138
}
1501
1139
1502
if(quit_now){
1503
goto end;
1140
if(interface[0] != '\0'){
1141
if_index = (AvahiIfIndex) if_nametoindex(interface);
1142
if(if_index == 0){
1143
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1504
1147
}
1505
1148
1506
1149
if(connect_to != NULL){
1512
1155
exitcode = EXIT_FAILURE;
1513
1156
goto end;
1514
1157
}
1515
1516
if(quit_now){
1517
goto end;
1518
}
1519
1520
1158
uint16_t port;
1521
errno = 0;
1522
tmpmax = strtoimax(address+1, &tmp, 10);
1523
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1524
or tmpmax != (uint16_t)tmpmax){
1159
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1160
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1161
or address[numchars+1] != '\0'){
1525
1162
fprintf(stderr, "Bad port number\n");
1526
1163
exitcode = EXIT_FAILURE;
1527
1164
goto end;
1528
1165
}
1529
1530
if(quit_now){
1531
goto end;
1532
}
1533
1534
1166
port = (uint16_t)tmpmax;
1535
1167
*address = '\0';
1536
1168
address = connect_to;
1541
1173
} else {
1542
1174
af = AF_INET;
1543
1175
}
1544
1545
if(quit_now){
1546
goto end;
1547
}
1548
1549
1176
ret = start_mandos_communication(address, port, if_index, af);
1550
1177
if(ret < 0){
1551
1178
exitcode = EXIT_FAILURE;
1555
1182
goto end;
1556
1183
}
1557
1184
1558
if(quit_now){
1185
if(not debug){
1186
avahi_set_log_function(empty_log);
1187
}
1188
1189
/* Initialize the pseudo-RNG for Avahi */
1190
srand((unsigned int) time(NULL));
1191
1192
/* Allocate main Avahi loop object */
1193
mc.simple_poll = avahi_simple_poll_new();
1194
if(mc.simple_poll == NULL){
1195
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1196
exitcode = EXIT_FAILURE;
1559
1197
goto end;
1560
1198
}
1561
1199
1585
1223
goto end;
1586
1224
}
1587
1225
1588
if(quit_now){
1589
goto end;
1590
}
1591
1592
1226
/* Create the Avahi service browser */
1593
1227
sb = avahi_s_service_browser_new(mc.server, if_index,
1594
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1228
AVAHI_PROTO_INET6, "_mandos._tcp",
1595
1229
NULL, 0, browse_callback, NULL);
1596
1230
if(sb == NULL){
1597
1231
fprintf(stderr, "Failed to create service browser: %s\n",
1600
1234
goto end;
1601
1235
}
1602
1236
1603
if(quit_now){
1604
goto end;
1605
}
1237
sigemptyset(&sigterm_action.sa_mask);
1238
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1239
if(ret == -1){
1240
perror("sigaddset");
1241
exitcode = EXIT_FAILURE;
1242
goto end;
1243
}
1244
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1245
if(ret == -1){
1246
perror("sigaddset");
1247
exitcode = EXIT_FAILURE;
1248
goto end;
1249
}
1250
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1251
if(ret == -1){
1252
perror("sigaddset");
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1257
if(ret == -1){
1258
perror("sigaction");
1259
exitcode = EXIT_FAILURE;
1260
goto end;
1261
}
1606
1262
1607
1263
/* Run the main loop */
1608
1264
1638
1294
gpgme_release(mc.ctx);
1639
1295
}
1640
1296
1641
/* Take down the network interface */
1642
if(take_down_interface){
1643
/* Re-raise priviliges */
1644
errno = 0;
1645
ret = seteuid(0);
1646
if(ret == -1){
1647
perror("seteuid");
1648
}
1649
if(geteuid() == 0){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_UP) {
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1656
if(ret == -1){
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1658
}
1659
}
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror("close");
1663
}
1664
/* Lower privileges permanently */
1665
errno = 0;
1666
ret = setuid(uid);
1667
if(ret == -1){
1668
perror("setuid");
1669
}
1670
}
1671
}
1672
1673
1297
/* Removes the temp directory used by GPGME */
1674
1298
if(tempdir_created){
1675
1299
DIR *d;
1714
1338
}
1715
1339
}
1716
1340
1717
if(quit_now){
1718
sigemptyset(&old_sigterm_action.sa_mask);
1719
old_sigterm_action.sa_handler = SIG_DFL;
1720
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1721
&old_sigterm_action,
1722
NULL));
1723
if(ret == -1){
1724
perror("sigaction");
1725
}
1726
do {
1727
ret = raise(signal_received);
1728
} while(ret != 0 and errno == EINTR);
1729
if(ret != 0){
1730
perror("raise");
1731
abort();
1732
}
1733
TEMP_FAILURE_RETRY(pause());
1734
}
1735
1736
1341
return exitcode;
1737
1342
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0