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- Committer: Teddy Hogeborn
- Date: 2010-09-12 03:22:48 UTC
- Revision ID: teddy@fukt.bsnet.se-20100912032248-6cizkymqivr5uzwm
* Makefile (run-server): Remove warning about now-eliminated error.
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
39
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
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() */
121
127
static const char mandos_protocol_version[] = "1";
122
128
const char *argp_program_version = "mandos-client " VERSION;
123
129
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;
124
132
125
133
/* Used for passing in values through the Avahi callback functions */
126
134
typedef struct {
138
146
.dh_bits = 1024, .priority = "SECURE256"
139
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
140
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
141
152
/*
142
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
143
154
* bytes. "buffer_capacity" is how much is currently allocated,
160
171
*/
161
172
static bool init_gpgme(const char *seckey,
162
173
const char *pubkey, const char *tempdir){
163
int ret;
164
174
gpgme_error_t rc;
165
175
gpgme_engine_info_t engine_info;
166
176
169
179
* Helper function to insert pub and seckey to the engine keyring.
170
180
*/
171
181
bool import_key(const char *filename){
182
int ret;
172
183
int fd;
173
184
gpgme_data_t pgp_data;
174
185
245
256
return false;
246
257
}
247
258
248
return true;
259
return true;
249
260
}
250
261
251
262
/*
305
316
}
306
317
gpgme_recipient_t recipient;
307
318
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
}
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;
318
327
}
319
328
}
320
329
}
472
481
static int init_gnutls_session(gnutls_session_t *session){
473
482
int ret;
474
483
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
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);
476
490
if(ret != GNUTLS_E_SUCCESS){
477
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
492
safer_gnutls_strerror(ret));
480
494
481
495
{
482
496
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &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);
484
504
if(ret != GNUTLS_E_SUCCESS){
485
505
fprintf(stderr, "Syntax error at: %s\n", err);
486
506
fprintf(stderr, "GnuTLS error: %s\n",
490
510
}
491
511
}
492
512
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
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);
495
521
if(ret != GNUTLS_E_SUCCESS){
496
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
523
safer_gnutls_strerror(ret));
500
526
}
501
527
502
528
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
530
506
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
507
532
516
541
static int start_mandos_communication(const char *ip, uint16_t port,
517
542
AvahiIfIndex if_index,
518
543
int af){
519
int ret, tcp_sd;
544
int ret, tcp_sd = -1;
520
545
ssize_t sret;
521
546
union {
522
547
struct sockaddr_in in;
523
548
struct sockaddr_in6 in6;
524
549
} to;
525
550
char *buffer = NULL;
526
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
527
552
size_t buffer_length = 0;
528
553
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
530
554
size_t written;
531
int retval = 0;
555
int retval = -1;
532
556
gnutls_session_t session;
533
557
int pf; /* Protocol family */
534
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
535
566
switch(af){
536
567
case AF_INET6:
537
568
pf = PF_INET6;
541
572
break;
542
573
default:
543
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
544
576
return -1;
545
577
}
546
578
556
588
557
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
590
if(tcp_sd < 0){
591
int e = errno;
559
592
perror("socket");
560
return -1;
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
561
600
}
562
601
563
602
memset(&to, 0, sizeof(to));
564
603
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
604
to.in6.sin6_family = (sa_family_t)af;
566
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
606
} else { /* IPv4 */
568
607
to.in.sin_family = (sa_family_t)af;
569
608
ret = inet_pton(af, ip, &to.in.sin_addr);
570
609
}
571
610
if(ret < 0 ){
611
int e = errno;
572
612
perror("inet_pton");
573
return -1;
613
errno = e;
614
goto mandos_end;
574
615
}
575
616
if(ret == 0){
617
int e = errno;
576
618
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
619
errno = e;
620
goto mandos_end;
578
621
}
579
622
if(af == AF_INET6){
580
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
587
630
if(if_index == AVAHI_IF_UNSPEC){
588
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
632
" without a network interface\n");
590
return -1;
633
errno = EINVAL;
634
goto mandos_end;
591
635
}
592
636
/* Set the network interface number as scope */
593
637
to.in6.sin6_scope_id = (uint32_t)if_index;
598
642
-Wunreachable-code */
599
643
}
600
644
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
601
650
if(debug){
602
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
652
char interface[IF_NAMESIZE];
630
679
}
631
680
}
632
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
633
687
if(af == AF_INET6){
634
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
689
} else {
636
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
691
}
638
692
if(ret < 0){
693
int e = errno;
639
694
perror("connect");
640
return -1;
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
641
702
}
642
703
643
704
const char *out = mandos_protocol_version;
647
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
709
out_size - written));
649
710
if(ret == -1){
711
int e = errno;
650
712
perror("write");
651
retval = -1;
713
errno = e;
652
714
goto mandos_end;
653
715
}
654
716
written += (size_t)ret;
662
724
break;
663
725
}
664
726
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
731
}
665
732
}
666
733
667
734
if(debug){
668
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
736
}
670
737
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
671
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
744
673
do{
745
if(quit_now){
746
errno = EINTR;
747
goto mandos_end;
748
}
749
750
do {
674
751
ret = gnutls_handshake(session);
752
if(quit_now){
753
errno = EINTR;
754
goto mandos_end;
755
}
675
756
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
757
677
758
if(ret != GNUTLS_E_SUCCESS){
679
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
680
761
gnutls_perror(ret);
681
762
}
682
retval = -1;
763
errno = EPROTO;
683
764
goto mandos_end;
684
765
}
685
766
691
772
}
692
773
693
774
while(true){
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
694
781
buffer_capacity = incbuffer(&buffer, buffer_length,
695
782
buffer_capacity);
696
783
if(buffer_capacity == 0){
784
int e = errno;
697
785
perror("incbuffer");
698
retval = -1;
786
errno = e;
787
goto mandos_end;
788
}
789
790
if(quit_now){
791
errno = EINTR;
699
792
goto mandos_end;
700
793
}
701
794
710
803
case GNUTLS_E_AGAIN:
711
804
break;
712
805
case GNUTLS_E_REHANDSHAKE:
713
do{
806
do {
714
807
ret = gnutls_handshake(session);
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
715
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
814
if(ret < 0){
717
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
718
816
gnutls_perror(ret);
719
retval = -1;
817
errno = EPROTO;
720
818
goto mandos_end;
721
819
}
722
820
break;
723
821
default:
724
822
fprintf(stderr, "Unknown error while reading data from"
725
823
" encrypted session with Mandos server\n");
726
retval = -1;
727
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
errno = EIO;
728
826
goto mandos_end;
729
827
}
730
828
} else {
736
834
fprintf(stderr, "Closing TLS session\n");
737
835
}
738
836
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
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);
740
849
741
850
if(buffer_length > 0){
851
ssize_t decrypted_buffer_size;
742
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
853
buffer_length,
744
854
&decrypted_buffer);
745
855
if(decrypted_buffer_size >= 0){
856
746
857
written = 0;
747
858
while(written < (size_t) decrypted_buffer_size){
859
if(quit_now){
860
errno = EINTR;
861
goto mandos_end;
862
}
863
748
864
ret = (int)fwrite(decrypted_buffer + written, 1,
749
865
(size_t)decrypted_buffer_size - written,
750
866
stdout);
751
867
if(ret == 0 and ferror(stdout)){
868
int e = errno;
752
869
if(debug){
753
870
fprintf(stderr, "Error writing encrypted data: %s\n",
754
871
strerror(errno));
755
872
}
756
retval = -1;
757
break;
873
errno = e;
874
goto mandos_end;
758
875
}
759
876
written += (size_t)ret;
760
877
}
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
878
retval = 0;
764
879
}
765
} else {
766
retval = -1;
767
880
}
768
881
769
882
/* Shutdown procedure */
770
883
771
884
mandos_end:
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
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
904
}
777
gnutls_deinit(session);
778
905
return retval;
779
906
}
780
907
797
924
/* Called whenever a service has been resolved successfully or
798
925
timed out */
799
926
927
if(quit_now){
928
return;
929
}
930
800
931
switch(event){
801
932
default:
802
933
case AVAHI_RESOLVER_FAILURE:
839
970
/* Called whenever a new services becomes available on the LAN or
840
971
is removed from the LAN */
841
972
973
if(quit_now){
974
return;
975
}
976
842
977
switch(event){
843
978
default:
844
979
case AVAHI_BROWSER_FAILURE:
873
1008
}
874
1009
}
875
1010
876
sig_atomic_t quit_now = 0;
877
878
1011
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
1012
static void handle_sigterm(int sig){
880
1013
if(quit_now){
881
1014
return;
882
1015
}
883
1016
quit_now = 1;
1017
signal_received = sig;
884
1018
int old_errno = errno;
885
1019
if(mc.simple_poll != NULL){
886
1020
avahi_simple_poll_quit(mc.simple_poll);
888
1022
errno = old_errno;
889
1023
}
890
1024
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
891
1120
int main(int argc, char *argv[]){
892
1121
AvahiSServiceBrowser *sb = NULL;
893
1122
int error;
895
1124
intmax_t tmpmax;
896
1125
char *tmp;
897
1126
int exitcode = EXIT_SUCCESS;
898
const char *interface = "eth0";
1127
const char *interface = "";
899
1128
struct ifreq network;
900
int sd;
1129
int sd = -1;
1130
bool take_down_interface = false;
901
1131
uid_t uid;
902
1132
gid_t gid;
903
char *connect_to = NULL;
904
1133
char tempdir[] = "/tmp/mandosXXXXXX";
905
1134
bool tempdir_created = false;
906
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
1140
bool gpgme_initialized = false;
912
1141
float delay = 2.5f;
913
1142
914
struct sigaction old_sigterm_action;
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
915
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
916
1145
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
917
1167
{
918
1168
struct argp_option options[] = {
919
1169
{ .name = "debug", .key = 128,
948
1198
.arg = "SECONDS",
949
1199
.doc = "Maximum delay to wait for interface startup",
950
1200
.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 },
951
1210
{ .name = NULL }
952
1211
};
953
1212
954
1213
error_t parse_opt(int key, char *arg,
955
1214
struct argp_state *state){
1215
errno = 0;
956
1216
switch(key){
957
1217
case 128: /* --debug */
958
1218
debug = true;
974
1234
tmpmax = strtoimax(arg, &tmp, 10);
975
1235
if(errno != 0 or tmp == arg or *tmp != '\0'
976
1236
or tmpmax != (typeof(mc.dh_bits))tmpmax){
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
1237
argp_error(state, "Bad number of DH bits");
979
1238
}
980
1239
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
981
1240
break;
986
1245
errno = 0;
987
1246
delay = strtof(arg, &tmp);
988
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
1248
argp_error(state, "Bad delay");
991
1249
}
992
1250
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
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);
996
1264
break;
997
1265
default:
998
1266
return ARGP_ERR_UNKNOWN;
999
1267
}
1000
return 0;
1268
return errno;
1001
1269
}
1002
1270
1003
1271
struct argp argp = { .options = options, .parser = parse_opt,
1004
1272
.args_doc = "",
1005
1273
.doc = "Mandos client -- Get and decrypt"
1006
1274
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
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
1288
goto end;
1012
1289
}
1013
1290
}
1015
1292
if(not debug){
1016
1293
avahi_set_log_function(empty_log);
1017
1294
}
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
}
1018
1320
1019
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1020
1322
from the signal handler */
1023
1325
mc.simple_poll = avahi_simple_poll_new();
1024
1326
if(mc.simple_poll == NULL){
1025
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
1328
exitcode = EX_UNAVAILABLE;
1027
1329
goto end;
1028
1330
}
1029
1331
1031
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1032
1334
if(ret == -1){
1033
1335
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1336
exitcode = EX_OSERR;
1035
1337
goto end;
1036
1338
}
1037
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1038
1340
if(ret == -1){
1039
1341
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1342
exitcode = EX_OSERR;
1041
1343
goto end;
1042
1344
}
1043
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1044
1346
if(ret == -1){
1045
1347
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
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
}
1055
1394
1056
1395
/* If the interface is down, bring it up */
1057
if(interface[0] != '\0'){
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
1058
1415
#ifdef __linux__
1059
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1060
messages to mess up the prompt */
1417
messages about the network interface to mess up the prompt */
1061
1418
ret = klogctl(8, NULL, 5);
1062
1419
bool restore_loglevel = true;
1063
1420
if(ret == -1){
1069
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1070
1427
if(sd < 0){
1071
1428
perror("socket");
1072
exitcode = EXIT_FAILURE;
1429
exitcode = EX_OSERR;
1073
1430
#ifdef __linux__
1074
1431
if(restore_loglevel){
1075
1432
ret = klogctl(7, NULL, 0);
1078
1435
}
1079
1436
}
1080
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1081
1444
goto end;
1082
1445
}
1083
1446
strcpy(network.ifr_name, interface);
1092
1455
}
1093
1456
}
1094
1457
#endif /* __linux__ */
1095
exitcode = EXIT_FAILURE;
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1096
1465
goto end;
1097
1466
}
1098
1467
if((network.ifr_flags & IFF_UP) == 0){
1099
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1100
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1101
1471
if(ret == -1){
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1104
1475
#ifdef __linux__
1105
1476
if(restore_loglevel){
1106
1477
ret = klogctl(7, NULL, 0);
1109
1480
}
1110
1481
}
1111
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1112
1489
goto end;
1113
1490
}
1114
1491
}
1126
1503
perror("nanosleep");
1127
1504
}
1128
1505
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
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
}
1132
1512
}
1133
1513
#ifdef __linux__
1134
1514
if(restore_loglevel){
1139
1519
}
1140
1520
}
1141
1521
#endif /* __linux__ */
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
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;
1156
1541
}
1157
1542
1158
1543
ret = init_gnutls_global(pubkey, seckey);
1159
1544
if(ret == -1){
1160
1545
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
1546
exitcode = EX_UNAVAILABLE;
1162
1547
goto end;
1163
1548
} else {
1164
1549
gnutls_initialized = true;
1165
1550
}
1166
1551
1552
if(quit_now){
1553
goto end;
1554
}
1555
1556
tempdir_created = true;
1167
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1168
1559
perror("mkdtemp");
1169
1560
goto end;
1170
1561
}
1171
tempdir_created = true;
1562
1563
if(quit_now){
1564
goto end;
1565
}
1172
1566
1173
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1174
1568
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
1569
exitcode = EX_UNAVAILABLE;
1176
1570
goto end;
1177
1571
} else {
1178
1572
gpgme_initialized = true;
1179
1573
}
1180
1574
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1183
if(if_index == 0){
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1575
if(quit_now){
1576
goto end;
1188
1577
}
1189
1578
1190
1579
if(connect_to != NULL){
1193
1582
char *address = strrchr(connect_to, ':');
1194
1583
if(address == NULL){
1195
1584
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1585
exitcode = EX_USAGE;
1586
goto end;
1587
}
1588
1589
if(quit_now){
1590
goto end;
1591
}
1592
1199
1593
uint16_t port;
1200
1594
errno = 0;
1201
1595
tmpmax = strtoimax(address+1, &tmp, 10);
1202
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1203
1597
or tmpmax != (uint16_t)tmpmax){
1204
1598
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
1599
exitcode = EX_USAGE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1208
1607
port = (uint16_t)tmpmax;
1209
1608
*address = '\0';
1210
1609
address = connect_to;
1215
1614
} else {
1216
1615
af = AF_INET;
1217
1616
}
1617
1618
if(quit_now){
1619
goto end;
1620
}
1621
1218
1622
ret = start_mandos_communication(address, port, if_index, af);
1219
1623
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
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
}
1221
1643
} else {
1222
1644
exitcode = EXIT_SUCCESS;
1223
1645
}
1224
1646
goto end;
1225
1647
}
1226
1648
1649
if(quit_now){
1650
goto end;
1651
}
1652
1227
1653
{
1228
1654
AvahiServerConfig config;
1229
1655
/* Do not publish any local Zeroconf records */
1246
1672
if(mc.server == NULL){
1247
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1248
1674
avahi_strerror(error));
1249
exitcode = EXIT_FAILURE;
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1250
1680
goto end;
1251
1681
}
1252
1682
1257
1687
if(sb == NULL){
1258
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1259
1689
avahi_strerror(avahi_server_errno(mc.server)));
1260
exitcode = EXIT_FAILURE;
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1261
1695
goto end;
1262
1696
}
1263
1697
1295
1729
gpgme_release(mc.ctx);
1296
1730
}
1297
1731
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
1298
1764
/* Removes the temp directory used by GPGME */
1299
1765
if(tempdir_created){
1300
1766
DIR *d;
1339
1805
}
1340
1806
}
1341
1807
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
1342
1827
return exitcode;
1343
1828
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0