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- Committer: Teddy Hogeborn
- Date: 2010-03-27 18:50:53 UTC
- mfrom: (24.1.146 mandos)
- Revision ID: teddy@fukt.bsnet.se-20100327185053-ht5xs10afawgx0sq
Merge from Björn.
- files added:
- dbus-mandos.conf
- 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
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(),
71
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
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,
80
sig_atomic_t */
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
81
87
82
88
#ifdef __linux__
83
89
#include <sys/klog.h> /* klogctl() */
138
144
.dh_bits = 1024, .priority = "SECURE256"
139
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
140
146
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
141
150
/*
142
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
143
152
* bytes. "buffer_capacity" is how much is currently allocated,
160
169
*/
161
170
static bool init_gpgme(const char *seckey,
162
171
const char *pubkey, const char *tempdir){
163
int ret;
164
172
gpgme_error_t rc;
165
173
gpgme_engine_info_t engine_info;
166
174
169
177
* Helper function to insert pub and seckey to the engine keyring.
170
178
*/
171
179
bool import_key(const char *filename){
180
int ret;
172
181
int fd;
173
182
gpgme_data_t pgp_data;
174
183
245
254
return false;
246
255
}
247
256
248
return true;
257
return true;
249
258
}
250
259
251
260
/*
305
314
}
306
315
gpgme_recipient_t recipient;
307
316
recipient = result->recipients;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
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;
318
325
}
319
326
}
320
327
}
472
479
static int init_gnutls_session(gnutls_session_t *session){
473
480
int ret;
474
481
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
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);
476
488
if(ret != GNUTLS_E_SUCCESS){
477
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
490
safer_gnutls_strerror(ret));
480
492
481
493
{
482
494
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &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);
484
502
if(ret != GNUTLS_E_SUCCESS){
485
503
fprintf(stderr, "Syntax error at: %s\n", err);
486
504
fprintf(stderr, "GnuTLS error: %s\n",
490
508
}
491
509
}
492
510
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
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);
495
519
if(ret != GNUTLS_E_SUCCESS){
496
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
521
safer_gnutls_strerror(ret));
500
524
}
501
525
502
526
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
528
506
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
507
530
516
539
static int start_mandos_communication(const char *ip, uint16_t port,
517
540
AvahiIfIndex if_index,
518
541
int af){
519
int ret, tcp_sd;
542
int ret, tcp_sd = -1;
520
543
ssize_t sret;
521
544
union {
522
545
struct sockaddr_in in;
523
546
struct sockaddr_in6 in6;
524
547
} to;
525
548
char *buffer = NULL;
526
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
527
550
size_t buffer_length = 0;
528
551
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
530
552
size_t written;
531
int retval = 0;
553
int retval = -1;
532
554
gnutls_session_t session;
533
555
int pf; /* Protocol family */
534
556
557
errno = 0;
558
559
if(quit_now){
560
errno = EINTR;
561
return -1;
562
}
563
535
564
switch(af){
536
565
case AF_INET6:
537
566
pf = PF_INET6;
541
570
break;
542
571
default:
543
572
fprintf(stderr, "Bad address family: %d\n", af);
573
errno = EINVAL;
544
574
return -1;
545
575
}
546
576
556
586
557
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
588
if(tcp_sd < 0){
589
int e = errno;
559
590
perror("socket");
560
return -1;
591
errno = e;
592
goto mandos_end;
593
}
594
595
if(quit_now){
596
errno = EINTR;
597
goto mandos_end;
561
598
}
562
599
563
600
memset(&to, 0, sizeof(to));
564
601
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
602
to.in6.sin6_family = (sa_family_t)af;
566
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
604
} else { /* IPv4 */
568
605
to.in.sin_family = (sa_family_t)af;
569
606
ret = inet_pton(af, ip, &to.in.sin_addr);
570
607
}
571
608
if(ret < 0 ){
609
int e = errno;
572
610
perror("inet_pton");
573
return -1;
611
errno = e;
612
goto mandos_end;
574
613
}
575
614
if(ret == 0){
615
int e = errno;
576
616
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
617
errno = e;
618
goto mandos_end;
578
619
}
579
620
if(af == AF_INET6){
580
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
587
628
if(if_index == AVAHI_IF_UNSPEC){
588
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
630
" without a network interface\n");
590
return -1;
631
errno = EINVAL;
632
goto mandos_end;
591
633
}
592
634
/* Set the network interface number as scope */
593
635
to.in6.sin6_scope_id = (uint32_t)if_index;
598
640
-Wunreachable-code */
599
641
}
600
642
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
647
601
648
if(debug){
602
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
650
char interface[IF_NAMESIZE];
630
677
}
631
678
}
632
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
633
685
if(af == AF_INET6){
634
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
687
} else {
636
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
689
}
638
690
if(ret < 0){
691
int e = errno;
639
692
perror("connect");
640
return -1;
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
641
700
}
642
701
643
702
const char *out = mandos_protocol_version;
647
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
707
out_size - written));
649
708
if(ret == -1){
709
int e = errno;
650
710
perror("write");
651
retval = -1;
711
errno = e;
652
712
goto mandos_end;
653
713
}
654
714
written += (size_t)ret;
662
722
break;
663
723
}
664
724
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
665
730
}
666
731
667
732
if(debug){
668
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
734
}
670
735
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
671
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
742
673
do{
743
if(quit_now){
744
errno = EINTR;
745
goto mandos_end;
746
}
747
748
do {
674
749
ret = gnutls_handshake(session);
750
if(quit_now){
751
errno = EINTR;
752
goto mandos_end;
753
}
675
754
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
755
677
756
if(ret != GNUTLS_E_SUCCESS){
679
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
680
759
gnutls_perror(ret);
681
760
}
682
retval = -1;
761
errno = EPROTO;
683
762
goto mandos_end;
684
763
}
685
764
691
770
}
692
771
693
772
while(true){
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
694
779
buffer_capacity = incbuffer(&buffer, buffer_length,
695
780
buffer_capacity);
696
781
if(buffer_capacity == 0){
782
int e = errno;
697
783
perror("incbuffer");
698
retval = -1;
784
errno = e;
785
goto mandos_end;
786
}
787
788
if(quit_now){
789
errno = EINTR;
699
790
goto mandos_end;
700
791
}
701
792
710
801
case GNUTLS_E_AGAIN:
711
802
break;
712
803
case GNUTLS_E_REHANDSHAKE:
713
do{
804
do {
714
805
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
715
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
812
if(ret < 0){
717
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
718
814
gnutls_perror(ret);
719
retval = -1;
815
errno = EPROTO;
720
816
goto mandos_end;
721
817
}
722
818
break;
723
819
default:
724
820
fprintf(stderr, "Unknown error while reading data from"
725
821
" encrypted session with Mandos server\n");
726
retval = -1;
727
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
728
824
goto mandos_end;
729
825
}
730
826
} else {
736
832
fprintf(stderr, "Closing TLS session\n");
737
833
}
738
834
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
do {
841
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
847
741
848
if(buffer_length > 0){
849
ssize_t decrypted_buffer_size;
742
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
851
buffer_length,
744
852
&decrypted_buffer);
745
853
if(decrypted_buffer_size >= 0){
854
746
855
written = 0;
747
856
while(written < (size_t) decrypted_buffer_size){
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
748
862
ret = (int)fwrite(decrypted_buffer + written, 1,
749
863
(size_t)decrypted_buffer_size - written,
750
864
stdout);
751
865
if(ret == 0 and ferror(stdout)){
866
int e = errno;
752
867
if(debug){
753
868
fprintf(stderr, "Error writing encrypted data: %s\n",
754
869
strerror(errno));
755
870
}
756
retval = -1;
757
break;
871
errno = e;
872
goto mandos_end;
758
873
}
759
874
written += (size_t)ret;
760
875
}
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
876
retval = 0;
764
877
}
765
} else {
766
retval = -1;
767
878
}
768
879
769
880
/* Shutdown procedure */
770
881
771
882
mandos_end:
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
883
{
884
int e = errno;
885
free(decrypted_buffer);
886
free(buffer);
887
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
889
}
890
if(ret == -1){
891
if(e == 0){
892
e = errno;
893
}
894
perror("close");
895
}
896
gnutls_deinit(session);
897
if(quit_now){
898
e = EINTR;
899
retval = -1;
900
}
901
errno = e;
776
902
}
777
gnutls_deinit(session);
778
903
return retval;
779
904
}
780
905
797
922
/* Called whenever a service has been resolved successfully or
798
923
timed out */
799
924
925
if(quit_now){
926
return;
927
}
928
800
929
switch(event){
801
930
default:
802
931
case AVAHI_RESOLVER_FAILURE:
839
968
/* Called whenever a new services becomes available on the LAN or
840
969
is removed from the LAN */
841
970
971
if(quit_now){
972
return;
973
}
974
842
975
switch(event){
843
976
default:
844
977
case AVAHI_BROWSER_FAILURE:
854
987
the callback function is called the Avahi server will free the
855
988
resolver for us. */
856
989
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
861
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
862
994
name, avahi_strerror(avahi_server_errno(mc.server)));
863
995
break;
874
1006
}
875
1007
}
876
1008
877
sig_atomic_t quit_now = 0;
878
879
1009
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
1010
static void handle_sigterm(int sig){
881
1011
if(quit_now){
882
1012
return;
883
1013
}
884
1014
quit_now = 1;
1015
signal_received = sig;
885
1016
int old_errno = errno;
886
1017
if(mc.simple_poll != NULL){
887
1018
avahi_simple_poll_quit(mc.simple_poll);
894
1025
int error;
895
1026
int ret;
896
1027
intmax_t tmpmax;
897
int numchars;
1028
char *tmp;
898
1029
int exitcode = EXIT_SUCCESS;
899
1030
const char *interface = "eth0";
900
1031
struct ifreq network;
901
int sd;
1032
int sd = -1;
1033
bool take_down_interface = false;
902
1034
uid_t uid;
903
1035
gid_t gid;
904
1036
char *connect_to = NULL;
908
1040
const char *seckey = PATHDIR "/" SECKEY;
909
1041
const char *pubkey = PATHDIR "/" PUBKEY;
910
1042
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" };
915
1043
bool gnutls_initialized = false;
916
1044
bool gpgme_initialized = false;
917
double delay = 2.5;
918
919
struct sigaction old_sigterm_action;
1045
float delay = 2.5f;
1046
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
920
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
921
1049
1050
uid = getuid();
1051
gid = getgid();
1052
1053
/* Lower any group privileges we might have, just to be safe */
1054
errno = 0;
1055
ret = setgid(gid);
1056
if(ret == -1){
1057
perror("setgid");
1058
}
1059
1060
/* Lower user privileges (temporarily) */
1061
errno = 0;
1062
ret = seteuid(uid);
1063
if(ret == -1){
1064
perror("seteuid");
1065
}
1066
1067
if(quit_now){
1068
goto end;
1069
}
1070
922
1071
{
923
1072
struct argp_option options[] = {
924
1073
{ .name = "debug", .key = 128,
953
1102
.arg = "SECONDS",
954
1103
.doc = "Maximum delay to wait for interface startup",
955
1104
.group = 2 },
1105
/*
1106
* These reproduce what we would get without ARGP_NO_HELP
1107
*/
1108
{ .name = "help", .key = '?',
1109
.doc = "Give this help list", .group = -1 },
1110
{ .name = "usage", .key = -3,
1111
.doc = "Give a short usage message", .group = -1 },
1112
{ .name = "version", .key = 'V',
1113
.doc = "Print program version", .group = -1 },
956
1114
{ .name = NULL }
957
1115
};
958
1116
959
1117
error_t parse_opt(int key, char *arg,
960
1118
struct argp_state *state){
1119
errno = 0;
961
1120
switch(key){
962
1121
case 128: /* --debug */
963
1122
debug = true;
975
1134
pubkey = arg;
976
1135
break;
977
1136
case 129: /* --dh-bits */
978
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
979
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
980
or arg[numchars] != '\0'){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1137
errno = 0;
1138
tmpmax = strtoimax(arg, &tmp, 10);
1139
if(errno != 0 or tmp == arg or *tmp != '\0'
1140
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1141
argp_error(state, "Bad number of DH bits");
983
1142
}
984
1143
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
1144
break;
987
1146
mc.priority = arg;
988
1147
break;
989
1148
case 131: /* --delay */
990
ret = sscanf(arg, "%lf%n", &delay, &numchars);
991
if(ret < 1 or arg[numchars] != '\0'){
992
fprintf(stderr, "Bad delay\n");
993
exit(EXIT_FAILURE);
1149
errno = 0;
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
argp_error(state, "Bad delay");
994
1153
}
995
1154
break;
996
case ARGP_KEY_ARG:
997
argp_usage(state);
998
case ARGP_KEY_END:
1155
/*
1156
* These reproduce what we would get without ARGP_NO_HELP
1157
*/
1158
case '?': /* --help */
1159
argp_state_help(state, state->out_stream,
1160
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1161
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1162
case -3: /* --usage */
1163
argp_state_help(state, state->out_stream,
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
exit(argp_err_exit_status);
999
1168
break;
1000
1169
default:
1001
1170
return ARGP_ERR_UNKNOWN;
1002
1171
}
1003
return 0;
1172
return errno;
1004
1173
}
1005
1174
1006
1175
struct argp argp = { .options = options, .parser = parse_opt,
1007
1176
.args_doc = "",
1008
1177
.doc = "Mandos client -- Get and decrypt"
1009
1178
" passwords from a Mandos server" };
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
1182
case 0:
1183
break;
1184
case ENOMEM:
1185
default:
1186
errno = ret;
1187
perror("argp_parse");
1188
exitcode = EX_OSERR;
1189
goto end;
1190
case EINVAL:
1191
exitcode = EX_USAGE;
1014
1192
goto end;
1015
1193
}
1016
1194
}
1026
1204
mc.simple_poll = avahi_simple_poll_new();
1027
1205
if(mc.simple_poll == NULL){
1028
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1029
exitcode = EXIT_FAILURE;
1207
exitcode = EX_UNAVAILABLE;
1030
1208
goto end;
1031
1209
}
1032
1210
1034
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1035
1213
if(ret == -1){
1036
1214
perror("sigaddset");
1037
exitcode = EXIT_FAILURE;
1215
exitcode = EX_OSERR;
1038
1216
goto end;
1039
1217
}
1040
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1041
1219
if(ret == -1){
1042
1220
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1221
exitcode = EX_OSERR;
1044
1222
goto end;
1045
1223
}
1046
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1047
1225
if(ret == -1){
1048
1226
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1227
exitcode = EX_OSERR;
1228
goto end;
1229
}
1230
/* Need to check if the handler is SIG_IGN before handling:
1231
| [[info:libc:Initial Signal Actions]] |
1232
| [[info:libc:Basic Signal Handling]] |
1233
*/
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
if(ret == -1){
1236
perror("sigaction");
1237
return EX_OSERR;
1238
}
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
if(ret == -1){
1242
perror("sigaction");
1243
exitcode = EX_OSERR;
1244
goto end;
1245
}
1246
}
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
if(ret == -1){
1249
perror("sigaction");
1250
return EX_OSERR;
1251
}
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
if(ret == -1){
1255
perror("sigaction");
1256
exitcode = EX_OSERR;
1257
goto end;
1258
}
1259
}
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
if(ret == -1){
1262
perror("sigaction");
1263
return EX_OSERR;
1264
}
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1058
1273
1059
1274
/* If the interface is down, bring it up */
1060
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1061
1294
#ifdef __linux__
1062
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1063
messages to mess up the prompt */
1296
messages about the network interface to mess up the prompt */
1064
1297
ret = klogctl(8, NULL, 5);
1065
1298
bool restore_loglevel = true;
1066
1299
if(ret == -1){
1072
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1073
1306
if(sd < 0){
1074
1307
perror("socket");
1075
exitcode = EXIT_FAILURE;
1308
exitcode = EX_OSERR;
1076
1309
#ifdef __linux__
1077
1310
if(restore_loglevel){
1078
1311
ret = klogctl(7, NULL, 0);
1081
1314
}
1082
1315
}
1083
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1084
1323
goto end;
1085
1324
}
1086
1325
strcpy(network.ifr_name, interface);
1095
1334
}
1096
1335
}
1097
1336
#endif /* __linux__ */
1098
exitcode = EXIT_FAILURE;
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1099
1344
goto end;
1100
1345
}
1101
1346
if((network.ifr_flags & IFF_UP) == 0){
1102
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1103
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1104
1350
if(ret == -1){
1351
take_down_interface = false;
1105
1352
perror("ioctl SIOCSIFFLAGS");
1106
exitcode = EXIT_FAILURE;
1353
exitcode = EX_OSERR;
1107
1354
#ifdef __linux__
1108
1355
if(restore_loglevel){
1109
1356
ret = klogctl(7, NULL, 0);
1112
1359
}
1113
1360
}
1114
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1115
1368
goto end;
1116
1369
}
1117
1370
}
1129
1382
perror("nanosleep");
1130
1383
}
1131
1384
}
1132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1133
if(ret == -1){
1134
perror("close");
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1135
1391
}
1136
1392
#ifdef __linux__
1137
1393
if(restore_loglevel){
1142
1398
}
1143
1399
}
1144
1400
#endif /* __linux__ */
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");
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
1416
}
1417
1418
if(quit_now){
1419
goto end;
1159
1420
}
1160
1421
1161
1422
ret = init_gnutls_global(pubkey, seckey);
1162
1423
if(ret == -1){
1163
1424
fprintf(stderr, "init_gnutls_global failed\n");
1164
exitcode = EXIT_FAILURE;
1425
exitcode = EX_UNAVAILABLE;
1165
1426
goto end;
1166
1427
} else {
1167
1428
gnutls_initialized = true;
1168
1429
}
1169
1430
1431
if(quit_now){
1432
goto end;
1433
}
1434
1435
tempdir_created = true;
1170
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1171
1438
perror("mkdtemp");
1172
1439
goto end;
1173
1440
}
1174
tempdir_created = true;
1441
1442
if(quit_now){
1443
goto end;
1444
}
1175
1445
1176
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1177
1447
fprintf(stderr, "init_gpgme failed\n");
1178
exitcode = EXIT_FAILURE;
1448
exitcode = EX_UNAVAILABLE;
1179
1449
goto end;
1180
1450
} else {
1181
1451
gpgme_initialized = true;
1182
1452
}
1183
1453
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
}
1454
if(quit_now){
1455
goto end;
1191
1456
}
1192
1457
1193
1458
if(connect_to != NULL){
1196
1461
char *address = strrchr(connect_to, ':');
1197
1462
if(address == NULL){
1198
1463
fprintf(stderr, "No colon in address\n");
1199
exitcode = EXIT_FAILURE;
1200
goto end;
1201
}
1464
exitcode = EX_USAGE;
1465
goto end;
1466
}
1467
1468
if(quit_now){
1469
goto end;
1470
}
1471
1202
1472
uint16_t port;
1203
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1204
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1205
or address[numchars+1] != '\0'){
1473
errno = 0;
1474
tmpmax = strtoimax(address+1, &tmp, 10);
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1206
1477
fprintf(stderr, "Bad port number\n");
1207
exitcode = EXIT_FAILURE;
1208
goto end;
1209
}
1478
exitcode = EX_USAGE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1210
1486
port = (uint16_t)tmpmax;
1211
1487
*address = '\0';
1212
1488
address = connect_to;
1217
1493
} else {
1218
1494
af = AF_INET;
1219
1495
}
1496
1497
if(quit_now){
1498
goto end;
1499
}
1500
1220
1501
ret = start_mandos_communication(address, port, if_index, af);
1221
1502
if(ret < 0){
1222
exitcode = EXIT_FAILURE;
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1223
1522
} else {
1224
1523
exitcode = EXIT_SUCCESS;
1225
1524
}
1226
1525
goto end;
1227
1526
}
1228
1527
1528
if(quit_now){
1529
goto end;
1530
}
1531
1229
1532
{
1230
1533
AvahiServerConfig config;
1231
1534
/* Do not publish any local Zeroconf records */
1248
1551
if(mc.server == NULL){
1249
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1250
1553
avahi_strerror(error));
1251
exitcode = EXIT_FAILURE;
1554
exitcode = EX_UNAVAILABLE;
1555
goto end;
1556
}
1557
1558
if(quit_now){
1252
1559
goto end;
1253
1560
}
1254
1561
1255
1562
/* Create the Avahi service browser */
1256
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
1257
AVAHI_PROTO_INET6, "_mandos._tcp",
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1258
1565
NULL, 0, browse_callback, NULL);
1259
1566
if(sb == NULL){
1260
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1261
1568
avahi_strerror(avahi_server_errno(mc.server)));
1262
exitcode = EXIT_FAILURE;
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
}
1572
1573
if(quit_now){
1263
1574
goto end;
1264
1575
}
1265
1576
1297
1608
gpgme_release(mc.ctx);
1298
1609
}
1299
1610
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1300
1643
/* Removes the temp directory used by GPGME */
1301
1644
if(tempdir_created){
1302
1645
DIR *d;
1341
1684
}
1342
1685
}
1343
1686
1687
if(quit_now){
1688
sigemptyset(&old_sigterm_action.sa_mask);
1689
old_sigterm_action.sa_handler = SIG_DFL;
1690
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1691
&old_sigterm_action,
1692
NULL));
1693
if(ret == -1){
1694
perror("sigaction");
1695
}
1696
do {
1697
ret = raise(signal_received);
1698
} while(ret != 0 and errno == EINTR);
1699
if(ret != 0){
1700
perror("raise");
1701
abort();
1702
}
1703
TEMP_FAILURE_RETRY(pause());
1704
}
1705
1344
1706
return exitcode;
1345
1707
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0