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- Committer: Teddy Hogeborn
- Date: 2009-09-17 02:42:49 UTC
- Revision ID: teddy@fukt.bsnet.se-20090917024249-y6j76xtzz3i2vptv
* plugins.d/mandos-client.c (init_gnutls_session): Always fail and
return immediately
if interrupted by
signal.
return immediately
if interrupted by
signal.
- 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
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
47
srand(), strtof() */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
56
59
#include <fcntl.h> /* open() */
57
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
61
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
65
#include <errno.h> /* perror(), errno */
62
66
#include <time.h> /* nanosleep(), time() */
67
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
72
*/
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
74
getuid(), getgid(), seteuid(),
71
75
setgid() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
77
#include <iso646.h> /* not, or, and */
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
82
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction */
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
80
85
81
86
#ifdef __linux__
82
87
#include <sys/klog.h> /* klogctl() */
83
#endif
88
#endif /* __linux__ */
84
89
85
90
/* Avahi */
86
91
/* All Avahi types, constants and functions
133
138
} mandos_context;
134
139
135
140
/* global context so signal handler can reach it*/
136
mandos_context mc;
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
sig_atomic_t quit_now = 0;
146
int signal_received = 0;
137
147
138
148
/*
139
* Make additional room in "buffer" for at least BUFFER_SIZE
140
* additional bytes. "buffer_capacity" is how much is currently
141
* allocated, "buffer_length" is how much is already used.
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* bytes. "buffer_capacity" is how much is currently allocated,
151
* "buffer_length" is how much is already used.
142
152
*/
143
153
size_t incbuffer(char **buffer, size_t buffer_length,
144
154
size_t buffer_capacity){
157
167
*/
158
168
static bool init_gpgme(const char *seckey,
159
169
const char *pubkey, const char *tempdir){
160
int ret;
161
170
gpgme_error_t rc;
162
171
gpgme_engine_info_t engine_info;
163
172
166
175
* Helper function to insert pub and seckey to the engine keyring.
167
176
*/
168
177
bool import_key(const char *filename){
178
int ret;
169
179
int fd;
170
180
gpgme_data_t pgp_data;
171
181
242
252
return false;
243
253
}
244
254
245
return true;
255
return true;
246
256
}
247
257
248
258
/*
302
312
}
303
313
gpgme_recipient_t recipient;
304
314
recipient = result->recipients;
305
if(recipient){
306
while(recipient != NULL){
307
fprintf(stderr, "Public key algorithm: %s\n",
308
gpgme_pubkey_algo_name(recipient->pubkey_algo));
309
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
310
fprintf(stderr, "Secret key available: %s\n",
311
recipient->status == GPG_ERR_NO_SECKEY
312
? "No" : "Yes");
313
recipient = recipient->next;
314
}
315
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
322
recipient = recipient->next;
315
323
}
316
324
}
317
325
}
469
477
static int init_gnutls_session(gnutls_session_t *session){
470
478
int ret;
471
479
/* GnuTLS session creation */
472
ret = gnutls_init(session, GNUTLS_SERVER);
480
do {
481
ret = gnutls_init(session, GNUTLS_SERVER);
482
if(quit_now){
483
return -1;
484
}
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
473
486
if(ret != GNUTLS_E_SUCCESS){
474
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
475
488
safer_gnutls_strerror(ret));
477
490
478
491
{
479
492
const char *err;
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
493
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
495
if(quit_now){
496
gnutls_deinit(*session);
497
return -1;
498
}
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
481
500
if(ret != GNUTLS_E_SUCCESS){
482
501
fprintf(stderr, "Syntax error at: %s\n", err);
483
502
fprintf(stderr, "GnuTLS error: %s\n",
487
506
}
488
507
}
489
508
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
491
mc.cred);
509
do {
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
512
if(quit_now){
513
gnutls_deinit(*session);
514
return -1;
515
}
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
492
517
if(ret != GNUTLS_E_SUCCESS){
493
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
494
519
safer_gnutls_strerror(ret));
497
522
}
498
523
499
524
/* ignore client certificate if any. */
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
502
526
503
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
504
528
513
537
static int start_mandos_communication(const char *ip, uint16_t port,
514
538
AvahiIfIndex if_index,
515
539
int af){
516
int ret, tcp_sd;
540
int ret, tcp_sd = -1;
517
541
ssize_t sret;
518
542
union {
519
543
struct sockaddr_in in;
523
547
char *decrypted_buffer;
524
548
size_t buffer_length = 0;
525
549
size_t buffer_capacity = 0;
526
ssize_t decrypted_buffer_size;
527
550
size_t written;
528
551
int retval = 0;
529
552
gnutls_session_t session;
530
553
int pf; /* Protocol family */
531
554
555
if(quit_now){
556
return -1;
557
}
558
532
559
switch(af){
533
560
case AF_INET6:
534
561
pf = PF_INET6;
554
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
555
582
if(tcp_sd < 0){
556
583
perror("socket");
557
return -1;
584
retval = -1;
585
goto mandos_end;
586
}
587
588
if(quit_now){
589
retval = -1;
590
goto mandos_end;
558
591
}
559
592
560
593
memset(&to, 0, sizeof(to));
561
594
if(af == AF_INET6){
562
to.in6.sin6_family = (uint16_t)af;
595
to.in6.sin6_family = (sa_family_t)af;
563
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
564
597
} else { /* IPv4 */
565
598
to.in.sin_family = (sa_family_t)af;
567
600
}
568
601
if(ret < 0 ){
569
602
perror("inet_pton");
570
return -1;
603
retval = -1;
604
goto mandos_end;
571
605
}
572
606
if(ret == 0){
573
607
fprintf(stderr, "Bad address: %s\n", ip);
574
return -1;
608
retval = -1;
609
goto mandos_end;
575
610
}
576
611
if(af == AF_INET6){
577
612
to.in6.sin6_port = htons(port); /* Spurious warnings from
584
619
if(if_index == AVAHI_IF_UNSPEC){
585
620
fprintf(stderr, "An IPv6 link-local address is incomplete"
586
621
" without a network interface\n");
587
return -1;
622
retval = -1;
623
goto mandos_end;
588
624
}
589
625
/* Set the network interface number as scope */
590
626
to.in6.sin6_scope_id = (uint32_t)if_index;
595
631
-Wunreachable-code */
596
632
}
597
633
634
if(quit_now){
635
retval = -1;
636
goto mandos_end;
637
}
638
598
639
if(debug){
599
640
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
600
641
char interface[IF_NAMESIZE];
627
668
}
628
669
}
629
670
671
if(quit_now){
672
retval = -1;
673
goto mandos_end;
674
}
675
630
676
if(af == AF_INET6){
631
677
ret = connect(tcp_sd, &to.in6, sizeof(to));
632
678
} else {
634
680
}
635
681
if(ret < 0){
636
682
perror("connect");
637
return -1;
683
retval = -1;
684
goto mandos_end;
685
}
686
687
if(quit_now){
688
retval = -1;
689
goto mandos_end;
638
690
}
639
691
640
692
const char *out = mandos_protocol_version;
659
711
break;
660
712
}
661
713
}
714
715
if(quit_now){
716
retval = -1;
717
goto mandos_end;
718
}
662
719
}
663
720
664
721
if(debug){
665
722
fprintf(stderr, "Establishing TLS session with %s\n", ip);
666
723
}
667
724
725
if(quit_now){
726
retval = -1;
727
goto mandos_end;
728
}
729
668
730
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
669
731
670
do{
732
if(quit_now){
733
retval = -1;
734
goto mandos_end;
735
}
736
737
do {
671
738
ret = gnutls_handshake(session);
739
if(quit_now){
740
retval = -1;
741
goto mandos_end;
742
}
672
743
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
673
744
674
745
if(ret != GNUTLS_E_SUCCESS){
688
759
}
689
760
690
761
while(true){
762
763
if(quit_now){
764
retval = -1;
765
goto mandos_end;
766
}
767
691
768
buffer_capacity = incbuffer(&buffer, buffer_length,
692
769
buffer_capacity);
693
770
if(buffer_capacity == 0){
696
773
goto mandos_end;
697
774
}
698
775
776
if(quit_now){
777
retval = -1;
778
goto mandos_end;
779
}
780
699
781
sret = gnutls_record_recv(session, buffer+buffer_length,
700
782
BUFFER_SIZE);
701
783
if(sret == 0){
707
789
case GNUTLS_E_AGAIN:
708
790
break;
709
791
case GNUTLS_E_REHANDSHAKE:
710
do{
792
do {
711
793
ret = gnutls_handshake(session);
794
795
if(quit_now){
796
retval = -1;
797
goto mandos_end;
798
}
712
799
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
713
800
if(ret < 0){
714
801
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
733
820
fprintf(stderr, "Closing TLS session\n");
734
821
}
735
822
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
if(quit_now){
824
retval = -1;
825
goto mandos_end;
826
}
827
828
do {
829
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
830
if(quit_now){
831
retval = -1;
832
goto mandos_end;
833
}
834
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
737
835
738
836
if(buffer_length > 0){
837
ssize_t decrypted_buffer_size;
739
838
decrypted_buffer_size = pgp_packet_decrypt(buffer,
740
839
buffer_length,
741
840
&decrypted_buffer);
742
841
if(decrypted_buffer_size >= 0){
842
743
843
written = 0;
744
844
while(written < (size_t) decrypted_buffer_size){
845
if(quit_now){
846
retval = -1;
847
goto mandos_end;
848
}
849
745
850
ret = (int)fwrite(decrypted_buffer + written, 1,
746
851
(size_t)decrypted_buffer_size - written,
747
852
stdout);
767
872
768
873
mandos_end:
769
874
free(buffer);
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
875
if(tcp_sd >= 0){
876
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
877
}
771
878
if(ret == -1){
772
879
perror("close");
773
880
}
774
881
gnutls_deinit(session);
882
if(quit_now){
883
retval = -1;
884
}
775
885
return retval;
776
886
}
777
887
794
904
/* Called whenever a service has been resolved successfully or
795
905
timed out */
796
906
907
if(quit_now){
908
return;
909
}
910
797
911
switch(event){
798
912
default:
799
913
case AVAHI_RESOLVER_FAILURE:
836
950
/* Called whenever a new services becomes available on the LAN or
837
951
is removed from the LAN */
838
952
953
if(quit_now){
954
return;
955
}
956
839
957
switch(event){
840
958
default:
841
959
case AVAHI_BROWSER_FAILURE:
851
969
the callback function is called the Avahi server will free the
852
970
resolver for us. */
853
971
854
if(!(avahi_s_service_resolver_new(mc.server, interface,
855
protocol, name, type, domain,
856
AVAHI_PROTO_INET6, 0,
857
resolve_callback, NULL)))
972
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
973
name, type, domain, protocol, 0,
974
resolve_callback, NULL) == NULL)
858
975
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
859
976
name, avahi_strerror(avahi_server_errno(mc.server)));
860
977
break;
871
988
}
872
989
}
873
990
874
static void handle_sigterm(__attribute__((unused)) int sig){
991
/* stop main loop after sigterm has been called */
992
static void handle_sigterm(int sig){
993
if(quit_now){
994
return;
995
}
996
quit_now = 1;
997
signal_received = sig;
875
998
int old_errno = errno;
876
avahi_simple_poll_quit(mc.simple_poll);
999
if(mc.simple_poll != NULL){
1000
avahi_simple_poll_quit(mc.simple_poll);
1001
}
877
1002
errno = old_errno;
878
1003
}
879
1004
882
1007
int error;
883
1008
int ret;
884
1009
intmax_t tmpmax;
885
int numchars;
1010
char *tmp;
886
1011
int exitcode = EXIT_SUCCESS;
887
1012
const char *interface = "eth0";
888
1013
struct ifreq network;
889
int sd;
1014
int sd = -1;
1015
bool take_down_interface = false;
890
1016
uid_t uid;
891
1017
gid_t gid;
892
1018
char *connect_to = NULL;
896
1022
const char *seckey = PATHDIR "/" SECKEY;
897
1023
const char *pubkey = PATHDIR "/" PUBKEY;
898
1024
899
/* Initialize Mandos context */
900
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
901
.dh_bits = 1024, .priority = "SECURE256"
902
":!CTYPE-X.509:+CTYPE-OPENPGP" };
903
1025
bool gnutls_initialized = false;
904
1026
bool gpgme_initialized = false;
905
double delay = 2.5;
906
907
struct sigaction old_sigterm_action;
1027
float delay = 2.5f;
1028
1029
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
908
1030
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
909
1031
1032
uid = getuid();
1033
gid = getgid();
1034
1035
/* Lower any group privileges we might have, just to be safe */
1036
errno = 0;
1037
ret = setgid(gid);
1038
if(ret == -1){
1039
perror("setgid");
1040
}
1041
1042
/* Lower user privileges (temporarily) */
1043
errno = 0;
1044
ret = seteuid(uid);
1045
if(ret == -1){
1046
perror("seteuid");
1047
}
1048
1049
if(quit_now){
1050
goto end;
1051
}
1052
910
1053
{
911
1054
struct argp_option options[] = {
912
1055
{ .name = "debug", .key = 128,
963
1106
pubkey = arg;
964
1107
break;
965
1108
case 129: /* --dh-bits */
966
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
967
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
968
or arg[numchars] != '\0'){
1109
errno = 0;
1110
tmpmax = strtoimax(arg, &tmp, 10);
1111
if(errno != 0 or tmp == arg or *tmp != '\0'
1112
or tmpmax != (typeof(mc.dh_bits))tmpmax){
969
1113
fprintf(stderr, "Bad number of DH bits\n");
970
1114
exit(EXIT_FAILURE);
971
1115
}
975
1119
mc.priority = arg;
976
1120
break;
977
1121
case 131: /* --delay */
978
ret = sscanf(arg, "%lf%n", &delay, &numchars);
979
if(ret < 1 or arg[numchars] != '\0'){
1122
errno = 0;
1123
delay = strtof(arg, &tmp);
1124
if(errno != 0 or tmp == arg or *tmp != '\0'){
980
1125
fprintf(stderr, "Bad delay\n");
981
1126
exit(EXIT_FAILURE);
982
1127
}
1003
1148
}
1004
1149
}
1005
1150
1151
if(not debug){
1152
avahi_set_log_function(empty_log);
1153
}
1154
1155
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
from the signal handler */
1157
/* Initialize the pseudo-RNG for Avahi */
1158
srand((unsigned int) time(NULL));
1159
mc.simple_poll = avahi_simple_poll_new();
1160
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1165
1166
sigemptyset(&sigterm_action.sa_mask);
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1177
goto end;
1178
}
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
/* Need to check if the handler is SIG_IGN before handling:
1186
| [[info:libc:Initial Signal Actions]] |
1187
| [[info:libc:Basic Signal Handling]] |
1188
*/
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1206
}
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
}
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1219
}
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
}
1228
1006
1229
/* If the interface is down, bring it up */
1007
1230
if(interface[0] != '\0'){
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1235
goto end;
1236
}
1237
1238
if(quit_now){
1239
goto end;
1240
}
1241
1242
/* Re-raise priviliges */
1243
errno = 0;
1244
ret = seteuid(0);
1245
if(ret == -1){
1246
perror("seteuid");
1247
}
1248
1008
1249
#ifdef __linux__
1009
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1010
1251
messages to mess up the prompt */
1014
1255
restore_loglevel = false;
1015
1256
perror("klogctl");
1016
1257
}
1017
#endif
1258
#endif /* __linux__ */
1018
1259
1019
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1020
1261
if(sd < 0){
1027
1268
perror("klogctl");
1028
1269
}
1029
1270
}
1030
#endif
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
1275
if(ret == -1){
1276
perror("seteuid");
1277
}
1031
1278
goto end;
1032
1279
}
1033
1280
strcpy(network.ifr_name, interface);
1041
1288
perror("klogctl");
1042
1289
}
1043
1290
}
1044
#endif
1291
#endif /* __linux__ */
1045
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1046
1299
goto end;
1047
1300
}
1048
1301
if((network.ifr_flags & IFF_UP) == 0){
1049
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1050
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1051
1305
if(ret == -1){
1306
take_down_interface = false;
1052
1307
perror("ioctl SIOCSIFFLAGS");
1053
1308
exitcode = EXIT_FAILURE;
1054
1309
#ifdef __linux__
1058
1313
perror("klogctl");
1059
1314
}
1060
1315
}
1061
#endif
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1062
1323
goto end;
1063
1324
}
1064
1325
}
1076
1337
perror("nanosleep");
1077
1338
}
1078
1339
}
1079
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1080
if(ret == -1){
1081
perror("close");
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
if(ret == -1){
1344
perror("close");
1345
}
1082
1346
}
1083
1347
#ifdef __linux__
1084
1348
if(restore_loglevel){
1088
1352
perror("klogctl");
1089
1353
}
1090
1354
}
1091
#endif
1092
}
1093
1094
uid = getuid();
1095
gid = getgid();
1096
1097
errno = 0;
1098
setgid(gid);
1099
if(ret == -1){
1100
perror("setgid");
1101
}
1102
1103
ret = setuid(uid);
1104
if(ret == -1){
1105
perror("setuid");
1355
#endif /* __linux__ */
1356
/* Lower privileges */
1357
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
1370
}
1371
}
1372
1373
if(quit_now){
1374
goto end;
1106
1375
}
1107
1376
1108
1377
ret = init_gnutls_global(pubkey, seckey);
1114
1383
gnutls_initialized = true;
1115
1384
}
1116
1385
1386
if(quit_now){
1387
goto end;
1388
}
1389
1390
tempdir_created = true;
1117
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1118
1393
perror("mkdtemp");
1119
1394
goto end;
1120
1395
}
1121
tempdir_created = true;
1396
1397
if(quit_now){
1398
goto end;
1399
}
1122
1400
1123
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1124
1402
fprintf(stderr, "init_gpgme failed\n");
1128
1406
gpgme_initialized = true;
1129
1407
}
1130
1408
1131
if(interface[0] != '\0'){
1132
if_index = (AvahiIfIndex) if_nametoindex(interface);
1133
if(if_index == 0){
1134
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1409
if(quit_now){
1410
goto end;
1138
1411
}
1139
1412
1140
1413
if(connect_to != NULL){
1146
1419
exitcode = EXIT_FAILURE;
1147
1420
goto end;
1148
1421
}
1422
1423
if(quit_now){
1424
goto end;
1425
}
1426
1149
1427
uint16_t port;
1150
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1151
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1152
or address[numchars+1] != '\0'){
1428
errno = 0;
1429
tmpmax = strtoimax(address+1, &tmp, 10);
1430
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
or tmpmax != (uint16_t)tmpmax){
1153
1432
fprintf(stderr, "Bad port number\n");
1154
1433
exitcode = EXIT_FAILURE;
1155
1434
goto end;
1156
1435
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1157
1441
port = (uint16_t)tmpmax;
1158
1442
*address = '\0';
1159
1443
address = connect_to;
1164
1448
} else {
1165
1449
af = AF_INET;
1166
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1167
1456
ret = start_mandos_communication(address, port, if_index, af);
1168
1457
if(ret < 0){
1169
1458
exitcode = EXIT_FAILURE;
1173
1462
goto end;
1174
1463
}
1175
1464
1176
if(not debug){
1177
avahi_set_log_function(empty_log);
1178
}
1179
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1182
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;
1465
if(quit_now){
1188
1466
goto end;
1189
1467
}
1190
1468
1214
1492
goto end;
1215
1493
}
1216
1494
1495
if(quit_now){
1496
goto end;
1497
}
1498
1217
1499
/* Create the Avahi service browser */
1218
1500
sb = avahi_s_service_browser_new(mc.server, if_index,
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1220
1502
NULL, 0, browse_callback, NULL);
1221
1503
if(sb == NULL){
1222
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1225
1507
goto end;
1226
1508
}
1227
1509
1228
sigemptyset(&sigterm_action.sa_mask);
1229
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1230
if(ret == -1){
1231
perror("sigaddset");
1232
exitcode = EXIT_FAILURE;
1510
if(quit_now){
1233
1511
goto end;
1234
1512
}
1235
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1236
if(ret == -1){
1237
perror("sigaction");
1238
exitcode = EXIT_FAILURE;
1239
goto end;
1240
}
1241
1513
1242
1514
/* Run the main loop */
1243
1515
1273
1545
gpgme_release(mc.ctx);
1274
1546
}
1275
1547
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
1555
}
1556
if(geteuid() == 0){
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
1565
}
1566
}
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
1576
}
1577
}
1578
}
1579
1276
1580
/* Removes the temp directory used by GPGME */
1277
1581
if(tempdir_created){
1278
1582
DIR *d;
1317
1621
}
1318
1622
}
1319
1623
1624
if(quit_now){
1625
sigemptyset(&old_sigterm_action.sa_mask);
1626
old_sigterm_action.sa_handler = SIG_DFL;
1627
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1628
if(ret == -1){
1629
perror("sigaction");
1630
}
1631
raise(signal_received);
1632
}
1633
1320
1634
return exitcode;
1321
1635
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0