To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 332
- compare with another revision
- download diff
- download tarball
- view history from revision 332
- Committer: Teddy Hogeborn
- Date: 2009-04-14 14:56:46 UTC
- Revision ID: teddy@fukt.bsnet.se-20090414145646-i6x4knw2f6cde3td
* debian/mandos-client.README.Debian: Added text about non-usability
of pseudo-network interfaces.
of pseudo-network interfaces.
added
removed
plugins.d/mandos-client.c
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
71
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_parse(), ARGP_KEY_ARG,
81
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
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 */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
87
85
88
86
#ifdef __linux__
89
87
#include <sys/klog.h> /* klogctl() */
127
125
static const char mandos_protocol_version[] = "1";
128
126
const char *argp_program_version = "mandos-client " VERSION;
129
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
132
128
133
129
/* Used for passing in values through the Avahi callback functions */
134
130
typedef struct {
146
142
.dh_bits = 1024, .priority = "SECURE256"
147
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
144
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
152
145
/*
153
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
147
* bytes. "buffer_capacity" is how much is currently allocated,
171
164
*/
172
165
static bool init_gpgme(const char *seckey,
173
166
const char *pubkey, const char *tempdir){
167
int ret;
174
168
gpgme_error_t rc;
175
169
gpgme_engine_info_t engine_info;
176
170
179
173
* Helper function to insert pub and seckey to the engine keyring.
180
174
*/
181
175
bool import_key(const char *filename){
182
int ret;
183
176
int fd;
184
177
gpgme_data_t pgp_data;
185
178
256
249
return false;
257
250
}
258
251
259
return true;
252
return true;
260
253
}
261
254
262
255
/*
316
309
}
317
310
gpgme_recipient_t recipient;
318
311
recipient = result->recipients;
319
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
326
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
327
322
}
328
323
}
329
324
}
481
476
static int init_gnutls_session(gnutls_session_t *session){
482
477
int ret;
483
478
/* GnuTLS session creation */
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
490
480
if(ret != GNUTLS_E_SUCCESS){
491
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
482
safer_gnutls_strerror(ret));
494
484
495
485
{
496
486
const char *err;
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
504
488
if(ret != GNUTLS_E_SUCCESS){
505
489
fprintf(stderr, "Syntax error at: %s\n", err);
506
490
fprintf(stderr, "GnuTLS error: %s\n",
510
494
}
511
495
}
512
496
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
521
499
if(ret != GNUTLS_E_SUCCESS){
522
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
501
safer_gnutls_strerror(ret));
526
504
}
527
505
528
506
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
530
509
531
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
511
541
520
static int start_mandos_communication(const char *ip, uint16_t port,
542
521
AvahiIfIndex if_index,
543
522
int af){
544
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
545
524
ssize_t sret;
546
525
union {
547
526
struct sockaddr_in in;
548
527
struct sockaddr_in6 in6;
549
528
} to;
550
529
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
552
531
size_t buffer_length = 0;
553
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
554
534
size_t written;
555
int retval = -1;
535
int retval = 0;
556
536
gnutls_session_t session;
557
537
int pf; /* Protocol family */
558
538
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
539
switch(af){
567
540
case AF_INET6:
568
541
pf = PF_INET6;
572
545
break;
573
546
default:
574
547
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
548
return -1;
577
549
}
578
550
588
560
589
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
562
if(tcp_sd < 0){
591
int e = errno;
592
563
perror("socket");
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
564
return -1;
600
565
}
601
566
602
567
memset(&to, 0, sizeof(to));
608
573
ret = inet_pton(af, ip, &to.in.sin_addr);
609
574
}
610
575
if(ret < 0 ){
611
int e = errno;
612
576
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
577
return -1;
615
578
}
616
579
if(ret == 0){
617
int e = errno;
618
580
fprintf(stderr, "Bad address: %s\n", ip);
619
errno = e;
620
goto mandos_end;
581
return -1;
621
582
}
622
583
if(af == AF_INET6){
623
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
630
591
if(if_index == AVAHI_IF_UNSPEC){
631
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
593
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
594
return -1;
635
595
}
636
596
/* Set the network interface number as scope */
637
597
to.in6.sin6_scope_id = (uint32_t)if_index;
642
602
-Wunreachable-code */
643
603
}
644
604
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
650
605
if(debug){
651
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
607
char interface[IF_NAMESIZE];
679
634
}
680
635
}
681
636
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
637
if(af == AF_INET6){
688
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
639
} else {
690
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
641
}
692
642
if(ret < 0){
693
int e = errno;
694
643
perror("connect");
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
644
return -1;
702
645
}
703
646
704
647
const char *out = mandos_protocol_version;
708
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
709
652
out_size - written));
710
653
if(ret == -1){
711
int e = errno;
712
654
perror("write");
713
errno = e;
655
retval = -1;
714
656
goto mandos_end;
715
657
}
716
658
written += (size_t)ret;
724
666
break;
725
667
}
726
668
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
731
}
732
669
}
733
670
734
671
if(debug){
735
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
736
673
}
737
674
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
744
676
745
if(quit_now){
746
errno = EINTR;
747
goto mandos_end;
748
}
749
750
do {
677
do{
751
678
ret = gnutls_handshake(session);
752
if(quit_now){
753
errno = EINTR;
754
goto mandos_end;
755
}
756
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
757
680
758
681
if(ret != GNUTLS_E_SUCCESS){
760
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
761
684
gnutls_perror(ret);
762
685
}
763
errno = EPROTO;
686
retval = -1;
764
687
goto mandos_end;
765
688
}
766
689
772
695
}
773
696
774
697
while(true){
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
698
buffer_capacity = incbuffer(&buffer, buffer_length,
782
699
buffer_capacity);
783
700
if(buffer_capacity == 0){
784
int e = errno;
785
701
perror("incbuffer");
786
errno = e;
787
goto mandos_end;
788
}
789
790
if(quit_now){
791
errno = EINTR;
702
retval = -1;
792
703
goto mandos_end;
793
704
}
794
705
803
714
case GNUTLS_E_AGAIN:
804
715
break;
805
716
case GNUTLS_E_REHANDSHAKE:
806
do {
717
do{
807
718
ret = gnutls_handshake(session);
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
813
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
720
if(ret < 0){
815
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
816
722
gnutls_perror(ret);
817
errno = EPROTO;
723
retval = -1;
818
724
goto mandos_end;
819
725
}
820
726
break;
821
727
default:
822
728
fprintf(stderr, "Unknown error while reading data from"
823
729
" encrypted session with Mandos server\n");
730
retval = -1;
824
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
errno = EIO;
826
732
goto mandos_end;
827
733
}
828
734
} else {
834
740
fprintf(stderr, "Closing TLS session\n");
835
741
}
836
742
837
if(quit_now){
838
errno = EINTR;
839
goto mandos_end;
840
}
841
842
do {
843
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
844
if(quit_now){
845
errno = EINTR;
846
goto mandos_end;
847
}
848
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
849
744
850
745
if(buffer_length > 0){
851
ssize_t decrypted_buffer_size;
852
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
747
buffer_length,
854
748
&decrypted_buffer);
855
749
if(decrypted_buffer_size >= 0){
856
857
750
written = 0;
858
751
while(written < (size_t) decrypted_buffer_size){
859
if(quit_now){
860
errno = EINTR;
861
goto mandos_end;
862
}
863
864
752
ret = (int)fwrite(decrypted_buffer + written, 1,
865
753
(size_t)decrypted_buffer_size - written,
866
754
stdout);
867
755
if(ret == 0 and ferror(stdout)){
868
int e = errno;
869
756
if(debug){
870
757
fprintf(stderr, "Error writing encrypted data: %s\n",
871
758
strerror(errno));
872
759
}
873
errno = e;
874
goto mandos_end;
760
retval = -1;
761
break;
875
762
}
876
763
written += (size_t)ret;
877
764
}
878
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
879
768
}
769
} else {
770
retval = -1;
880
771
}
881
772
882
773
/* Shutdown procedure */
883
774
884
775
mandos_end:
885
{
886
int e = errno;
887
free(decrypted_buffer);
888
free(buffer);
889
if(tcp_sd >= 0){
890
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
891
}
892
if(ret == -1){
893
if(e == 0){
894
e = errno;
895
}
896
perror("close");
897
}
898
gnutls_deinit(session);
899
if(quit_now){
900
e = EINTR;
901
retval = -1;
902
}
903
errno = e;
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
904
780
}
781
gnutls_deinit(session);
905
782
return retval;
906
783
}
907
784
924
801
/* Called whenever a service has been resolved successfully or
925
802
timed out */
926
803
927
if(quit_now){
928
return;
929
}
930
931
804
switch(event){
932
805
default:
933
806
case AVAHI_RESOLVER_FAILURE:
970
843
/* Called whenever a new services becomes available on the LAN or
971
844
is removed from the LAN */
972
845
973
if(quit_now){
974
return;
975
}
976
977
846
switch(event){
978
847
default:
979
848
case AVAHI_BROWSER_FAILURE:
1008
877
}
1009
878
}
1010
879
880
sig_atomic_t quit_now = 0;
881
1011
882
/* stop main loop after sigterm has been called */
1012
static void handle_sigterm(int sig){
883
static void handle_sigterm(__attribute__((unused)) int sig){
1013
884
if(quit_now){
1014
885
return;
1015
886
}
1016
887
quit_now = 1;
1017
signal_received = sig;
1018
888
int old_errno = errno;
1019
889
if(mc.simple_poll != NULL){
1020
890
avahi_simple_poll_quit(mc.simple_poll);
1022
892
errno = old_errno;
1023
893
}
1024
894
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1113
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1118
}
1119
1120
895
int main(int argc, char *argv[]){
1121
896
AvahiSServiceBrowser *sb = NULL;
1122
897
int error;
1124
899
intmax_t tmpmax;
1125
900
char *tmp;
1126
901
int exitcode = EXIT_SUCCESS;
1127
const char *interface = "";
902
const char *interface = "eth0";
1128
903
struct ifreq network;
1129
int sd = -1;
1130
bool take_down_interface = false;
904
int sd;
1131
905
uid_t uid;
1132
906
gid_t gid;
907
char *connect_to = NULL;
1133
908
char tempdir[] = "/tmp/mandosXXXXXX";
1134
909
bool tempdir_created = false;
1135
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1140
915
bool gpgme_initialized = false;
1141
916
float delay = 2.5f;
1142
917
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1144
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1145
920
1146
uid = getuid();
1147
gid = getgid();
1148
1149
/* Lower any group privileges we might have, just to be safe */
1150
errno = 0;
1151
ret = setgid(gid);
1152
if(ret == -1){
1153
perror("setgid");
1154
}
1155
1156
/* Lower user privileges (temporarily) */
1157
errno = 0;
1158
ret = seteuid(uid);
1159
if(ret == -1){
1160
perror("seteuid");
1161
}
1162
1163
if(quit_now){
1164
goto end;
1165
}
1166
1167
921
{
1168
922
struct argp_option options[] = {
1169
923
{ .name = "debug", .key = 128,
1198
952
.arg = "SECONDS",
1199
953
.doc = "Maximum delay to wait for interface startup",
1200
954
.group = 2 },
1201
/*
1202
* These reproduce what we would get without ARGP_NO_HELP
1203
*/
1204
{ .name = "help", .key = '?',
1205
.doc = "Give this help list", .group = -1 },
1206
{ .name = "usage", .key = -3,
1207
.doc = "Give a short usage message", .group = -1 },
1208
{ .name = "version", .key = 'V',
1209
.doc = "Print program version", .group = -1 },
1210
955
{ .name = NULL }
1211
956
};
1212
957
1213
958
error_t parse_opt(int key, char *arg,
1214
959
struct argp_state *state){
1215
errno = 0;
1216
960
switch(key){
1217
961
case 128: /* --debug */
1218
962
debug = true;
1234
978
tmpmax = strtoimax(arg, &tmp, 10);
1235
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1236
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1237
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1238
983
}
1239
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1240
985
break;
1245
990
errno = 0;
1246
991
delay = strtof(arg, &tmp);
1247
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
argp_error(state, "Bad delay");
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
1249
995
}
1250
996
break;
1251
/*
1252
* These reproduce what we would get without ARGP_NO_HELP
1253
*/
1254
case '?': /* --help */
1255
argp_state_help(state, state->out_stream,
1256
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1257
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1258
case -3: /* --usage */
1259
argp_state_help(state, state->out_stream,
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1263
exit(argp_err_exit_status);
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1264
1000
break;
1265
1001
default:
1266
1002
return ARGP_ERR_UNKNOWN;
1267
1003
}
1268
return errno;
1004
return 0;
1269
1005
}
1270
1006
1271
1007
struct argp argp = { .options = options, .parser = parse_opt,
1272
1008
.args_doc = "",
1273
1009
.doc = "Mandos client -- Get and decrypt"
1274
1010
" passwords from a Mandos server" };
1275
ret = argp_parse(&argp, argc, argv,
1276
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1277
switch(ret){
1278
case 0:
1279
break;
1280
case ENOMEM:
1281
default:
1282
errno = ret;
1283
perror("argp_parse");
1284
exitcode = EX_OSERR;
1285
goto end;
1286
case EINVAL:
1287
exitcode = EX_USAGE;
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1288
1015
goto end;
1289
1016
}
1290
1017
}
1292
1019
if(not debug){
1293
1020
avahi_set_log_function(empty_log);
1294
1021
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1317
goto end;
1318
}
1319
}
1320
1022
1321
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1322
1024
from the signal handler */
1325
1027
mc.simple_poll = avahi_simple_poll_new();
1326
1028
if(mc.simple_poll == NULL){
1327
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1328
exitcode = EX_UNAVAILABLE;
1030
exitcode = EXIT_FAILURE;
1329
1031
goto end;
1330
1032
}
1331
1033
1333
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
1036
if(ret == -1){
1335
1037
perror("sigaddset");
1336
exitcode = EX_OSERR;
1038
exitcode = EXIT_FAILURE;
1337
1039
goto end;
1338
1040
}
1339
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
1042
if(ret == -1){
1341
1043
perror("sigaddset");
1342
exitcode = EX_OSERR;
1044
exitcode = EXIT_FAILURE;
1343
1045
goto end;
1344
1046
}
1345
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
1048
if(ret == -1){
1347
1049
perror("sigaddset");
1348
exitcode = EX_OSERR;
1349
goto end;
1350
}
1351
/* Need to check if the handler is SIG_IGN before handling:
1352
| [[info:libc:Initial Signal Actions]] |
1353
| [[info:libc:Basic Signal Handling]] |
1354
*/
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
if(ret == -1){
1357
perror("sigaction");
1358
return EX_OSERR;
1359
}
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
if(ret == -1){
1363
perror("sigaction");
1364
exitcode = EX_OSERR;
1365
goto end;
1366
}
1367
}
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
if(ret == -1){
1370
perror("sigaction");
1371
return EX_OSERR;
1372
}
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
if(ret == -1){
1376
perror("sigaction");
1377
exitcode = EX_OSERR;
1378
goto end;
1379
}
1380
}
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
if(ret == -1){
1383
perror("sigaction");
1384
return EX_OSERR;
1385
}
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
if(ret == -1){
1389
perror("sigaction");
1390
exitcode = EX_OSERR;
1391
goto end;
1392
}
1393
}
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1394
1059
1395
1060
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
if(if_index == 0){
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
1061
if(interface[0] != '\0'){
1415
1062
#ifdef __linux__
1416
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1418
1065
ret = klogctl(8, NULL, 5);
1419
1066
bool restore_loglevel = true;
1420
1067
if(ret == -1){
1426
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
1074
if(sd < 0){
1428
1075
perror("socket");
1429
exitcode = EX_OSERR;
1076
exitcode = EXIT_FAILURE;
1430
1077
#ifdef __linux__
1431
1078
if(restore_loglevel){
1432
1079
ret = klogctl(7, NULL, 0);
1435
1082
}
1436
1083
}
1437
1084
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1444
1085
goto end;
1445
1086
}
1446
1087
strcpy(network.ifr_name, interface);
1455
1096
}
1456
1097
}
1457
1098
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1099
exitcode = EXIT_FAILURE;
1465
1100
goto end;
1466
1101
}
1467
1102
if((network.ifr_flags & IFF_UP) == 0){
1468
1103
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
1105
if(ret == -1){
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1475
1108
#ifdef __linux__
1476
1109
if(restore_loglevel){
1477
1110
ret = klogctl(7, NULL, 0);
1480
1113
}
1481
1114
}
1482
1115
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
1116
goto end;
1490
1117
}
1491
1118
}
1503
1130
perror("nanosleep");
1504
1131
}
1505
1132
}
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1512
1136
}
1513
1137
#ifdef __linux__
1514
1138
if(restore_loglevel){
1519
1143
}
1520
1144
}
1521
1145
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
} else {
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
1536
}
1537
}
1538
1539
if(quit_now){
1540
goto end;
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1541
1160
}
1542
1161
1543
1162
ret = init_gnutls_global(pubkey, seckey);
1544
1163
if(ret == -1){
1545
1164
fprintf(stderr, "init_gnutls_global failed\n");
1546
exitcode = EX_UNAVAILABLE;
1165
exitcode = EXIT_FAILURE;
1547
1166
goto end;
1548
1167
} else {
1549
1168
gnutls_initialized = true;
1550
1169
}
1551
1170
1552
if(quit_now){
1553
goto end;
1554
}
1555
1556
tempdir_created = true;
1557
1171
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
1172
perror("mkdtemp");
1560
1173
goto end;
1561
1174
}
1562
1563
if(quit_now){
1564
goto end;
1565
}
1175
tempdir_created = true;
1566
1176
1567
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
1178
fprintf(stderr, "init_gpgme failed\n");
1569
exitcode = EX_UNAVAILABLE;
1179
exitcode = EXIT_FAILURE;
1570
1180
goto end;
1571
1181
} else {
1572
1182
gpgme_initialized = true;
1573
1183
}
1574
1184
1575
if(quit_now){
1576
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
1577
1192
}
1578
1193
1579
1194
if(connect_to != NULL){
1582
1197
char *address = strrchr(connect_to, ':');
1583
1198
if(address == NULL){
1584
1199
fprintf(stderr, "No colon in address\n");
1585
exitcode = EX_USAGE;
1586
goto end;
1587
}
1588
1589
if(quit_now){
1590
goto end;
1591
}
1592
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1593
1203
uint16_t port;
1594
1204
errno = 0;
1595
1205
tmpmax = strtoimax(address+1, &tmp, 10);
1596
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
1207
or tmpmax != (uint16_t)tmpmax){
1598
1208
fprintf(stderr, "Bad port number\n");
1599
exitcode = EX_USAGE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1607
1212
port = (uint16_t)tmpmax;
1608
1213
*address = '\0';
1609
1214
address = connect_to;
1614
1219
} else {
1615
1220
af = AF_INET;
1616
1221
}
1617
1618
if(quit_now){
1619
goto end;
1620
}
1621
1622
1222
ret = start_mandos_communication(address, port, if_index, af);
1623
1223
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1224
exitcode = EXIT_FAILURE;
1643
1225
} else {
1644
1226
exitcode = EXIT_SUCCESS;
1645
1227
}
1646
1228
goto end;
1647
1229
}
1648
1649
if(quit_now){
1650
goto end;
1651
}
1652
1230
1653
1231
{
1654
1232
AvahiServerConfig config;
1655
1233
/* Do not publish any local Zeroconf records */
1672
1250
if(mc.server == NULL){
1673
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
1252
avahi_strerror(error));
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1253
exitcode = EXIT_FAILURE;
1680
1254
goto end;
1681
1255
}
1682
1256
1687
1261
if(sb == NULL){
1688
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1689
1263
avahi_strerror(avahi_server_errno(mc.server)));
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1264
exitcode = EXIT_FAILURE;
1695
1265
goto end;
1696
1266
}
1697
1267
1729
1299
gpgme_release(mc.ctx);
1730
1300
}
1731
1301
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1764
1302
/* Removes the temp directory used by GPGME */
1765
1303
if(tempdir_created){
1766
1304
DIR *d;
1805
1343
}
1806
1344
}
1807
1345
1808
if(quit_now){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1813
NULL));
1814
if(ret == -1){
1815
perror("sigaction");
1816
}
1817
do {
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1820
if(ret != 0){
1821
perror("raise");
1822
abort();
1823
}
1824
TEMP_FAILURE_RETRY(pause());
1825
}
1826
1827
1346
return exitcode;
1828
1347
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0