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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
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, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
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(), setuid(),
75
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
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, sigaction,
84
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 */
85
87
86
88
#ifdef __linux__
87
89
#include <sys/klog.h> /* klogctl() */
125
127
static const char mandos_protocol_version[] = "1";
126
128
const char *argp_program_version = "mandos-client " VERSION;
127
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;
128
132
129
133
/* Used for passing in values through the Avahi callback functions */
130
134
typedef struct {
142
146
.dh_bits = 1024, .priority = "SECURE256"
143
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
145
152
/*
146
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
154
* bytes. "buffer_capacity" is how much is currently allocated,
164
171
*/
165
172
static bool init_gpgme(const char *seckey,
166
173
const char *pubkey, const char *tempdir){
167
int ret;
168
174
gpgme_error_t rc;
169
175
gpgme_engine_info_t engine_info;
170
176
173
179
* Helper function to insert pub and seckey to the engine keyring.
174
180
*/
175
181
bool import_key(const char *filename){
182
int ret;
176
183
int fd;
177
184
gpgme_data_t pgp_data;
178
185
249
256
return false;
250
257
}
251
258
252
return true;
259
return true;
253
260
}
254
261
255
262
/*
309
316
}
310
317
gpgme_recipient_t recipient;
311
318
recipient = result->recipients;
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
}
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;
322
327
}
323
328
}
324
329
}
476
481
static int init_gnutls_session(gnutls_session_t *session){
477
482
int ret;
478
483
/* GnuTLS session creation */
479
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);
480
490
if(ret != GNUTLS_E_SUCCESS){
481
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
492
safer_gnutls_strerror(ret));
484
494
485
495
{
486
496
const char *err;
487
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);
488
504
if(ret != GNUTLS_E_SUCCESS){
489
505
fprintf(stderr, "Syntax error at: %s\n", err);
490
506
fprintf(stderr, "GnuTLS error: %s\n",
494
510
}
495
511
}
496
512
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
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);
499
521
if(ret != GNUTLS_E_SUCCESS){
500
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
523
safer_gnutls_strerror(ret));
504
526
}
505
527
506
528
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
509
530
510
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
511
532
520
541
static int start_mandos_communication(const char *ip, uint16_t port,
521
542
AvahiIfIndex if_index,
522
543
int af){
523
int ret, tcp_sd;
544
int ret, tcp_sd = -1;
524
545
ssize_t sret;
525
546
union {
526
547
struct sockaddr_in in;
527
548
struct sockaddr_in6 in6;
528
549
} to;
529
550
char *buffer = NULL;
530
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
531
552
size_t buffer_length = 0;
532
553
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
554
size_t written;
535
int retval = 0;
555
int retval = -1;
536
556
gnutls_session_t session;
537
557
int pf; /* Protocol family */
538
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
539
566
switch(af){
540
567
case AF_INET6:
541
568
pf = PF_INET6;
545
572
break;
546
573
default:
547
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
548
576
return -1;
549
577
}
550
578
560
588
561
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
590
if(tcp_sd < 0){
591
int e = errno;
563
592
perror("socket");
564
return -1;
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
565
600
}
566
601
567
602
memset(&to, 0, sizeof(to));
568
603
if(af == AF_INET6){
569
to.in6.sin6_family = (uint16_t)af;
604
to.in6.sin6_family = (sa_family_t)af;
570
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
571
606
} else { /* IPv4 */
572
607
to.in.sin_family = (sa_family_t)af;
573
608
ret = inet_pton(af, ip, &to.in.sin_addr);
574
609
}
575
610
if(ret < 0 ){
611
int e = errno;
576
612
perror("inet_pton");
577
return -1;
613
errno = e;
614
goto mandos_end;
578
615
}
579
616
if(ret == 0){
617
int e = errno;
580
618
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
619
errno = e;
620
goto mandos_end;
582
621
}
583
622
if(af == AF_INET6){
584
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
591
630
if(if_index == AVAHI_IF_UNSPEC){
592
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
632
" without a network interface\n");
594
return -1;
633
errno = EINVAL;
634
goto mandos_end;
595
635
}
596
636
/* Set the network interface number as scope */
597
637
to.in6.sin6_scope_id = (uint32_t)if_index;
602
642
-Wunreachable-code */
603
643
}
604
644
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
605
650
if(debug){
606
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
652
char interface[IF_NAMESIZE];
634
679
}
635
680
}
636
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
637
687
if(af == AF_INET6){
638
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
689
} else {
640
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
691
}
642
692
if(ret < 0){
693
int e = errno;
643
694
perror("connect");
644
return -1;
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
645
702
}
646
703
647
704
const char *out = mandos_protocol_version;
651
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
709
out_size - written));
653
710
if(ret == -1){
711
int e = errno;
654
712
perror("write");
655
retval = -1;
713
errno = e;
656
714
goto mandos_end;
657
715
}
658
716
written += (size_t)ret;
666
724
break;
667
725
}
668
726
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
731
}
669
732
}
670
733
671
734
if(debug){
672
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
736
}
674
737
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
675
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
744
677
do{
745
if(quit_now){
746
errno = EINTR;
747
goto mandos_end;
748
}
749
750
do {
678
751
ret = gnutls_handshake(session);
752
if(quit_now){
753
errno = EINTR;
754
goto mandos_end;
755
}
679
756
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
757
681
758
if(ret != GNUTLS_E_SUCCESS){
683
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
684
761
gnutls_perror(ret);
685
762
}
686
retval = -1;
763
errno = EPROTO;
687
764
goto mandos_end;
688
765
}
689
766
695
772
}
696
773
697
774
while(true){
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
698
781
buffer_capacity = incbuffer(&buffer, buffer_length,
699
782
buffer_capacity);
700
783
if(buffer_capacity == 0){
784
int e = errno;
701
785
perror("incbuffer");
702
retval = -1;
786
errno = e;
787
goto mandos_end;
788
}
789
790
if(quit_now){
791
errno = EINTR;
703
792
goto mandos_end;
704
793
}
705
794
714
803
case GNUTLS_E_AGAIN:
715
804
break;
716
805
case GNUTLS_E_REHANDSHAKE:
717
do{
806
do {
718
807
ret = gnutls_handshake(session);
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
719
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
814
if(ret < 0){
721
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
722
816
gnutls_perror(ret);
723
retval = -1;
817
errno = EPROTO;
724
818
goto mandos_end;
725
819
}
726
820
break;
727
821
default:
728
822
fprintf(stderr, "Unknown error while reading data from"
729
823
" encrypted session with Mandos server\n");
730
retval = -1;
731
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
errno = EIO;
732
826
goto mandos_end;
733
827
}
734
828
} else {
740
834
fprintf(stderr, "Closing TLS session\n");
741
835
}
742
836
743
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);
744
849
745
850
if(buffer_length > 0){
851
ssize_t decrypted_buffer_size;
746
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
853
buffer_length,
748
854
&decrypted_buffer);
749
855
if(decrypted_buffer_size >= 0){
856
750
857
written = 0;
751
858
while(written < (size_t) decrypted_buffer_size){
859
if(quit_now){
860
errno = EINTR;
861
goto mandos_end;
862
}
863
752
864
ret = (int)fwrite(decrypted_buffer + written, 1,
753
865
(size_t)decrypted_buffer_size - written,
754
866
stdout);
755
867
if(ret == 0 and ferror(stdout)){
868
int e = errno;
756
869
if(debug){
757
870
fprintf(stderr, "Error writing encrypted data: %s\n",
758
871
strerror(errno));
759
872
}
760
retval = -1;
761
break;
873
errno = e;
874
goto mandos_end;
762
875
}
763
876
written += (size_t)ret;
764
877
}
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
878
retval = 0;
768
879
}
769
} else {
770
retval = -1;
771
880
}
772
881
773
882
/* Shutdown procedure */
774
883
775
884
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
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;
780
904
}
781
gnutls_deinit(session);
782
905
return retval;
783
906
}
784
907
801
924
/* Called whenever a service has been resolved successfully or
802
925
timed out */
803
926
927
if(quit_now){
928
return;
929
}
930
804
931
switch(event){
805
932
default:
806
933
case AVAHI_RESOLVER_FAILURE:
843
970
/* Called whenever a new services becomes available on the LAN or
844
971
is removed from the LAN */
845
972
973
if(quit_now){
974
return;
975
}
976
846
977
switch(event){
847
978
default:
848
979
case AVAHI_BROWSER_FAILURE:
877
1008
}
878
1009
}
879
1010
880
sig_atomic_t quit_now = 0;
881
882
1011
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1012
static void handle_sigterm(int sig){
884
1013
if(quit_now){
885
1014
return;
886
1015
}
887
1016
quit_now = 1;
1017
signal_received = sig;
888
1018
int old_errno = errno;
889
1019
if(mc.simple_poll != NULL){
890
1020
avahi_simple_poll_quit(mc.simple_poll);
892
1022
errno = old_errno;
893
1023
}
894
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
895
1120
int main(int argc, char *argv[]){
896
1121
AvahiSServiceBrowser *sb = NULL;
897
1122
int error;
899
1124
intmax_t tmpmax;
900
1125
char *tmp;
901
1126
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
1127
const char *interface = "";
903
1128
struct ifreq network;
904
int sd;
1129
int sd = -1;
1130
bool take_down_interface = false;
905
1131
uid_t uid;
906
1132
gid_t gid;
907
char *connect_to = NULL;
908
1133
char tempdir[] = "/tmp/mandosXXXXXX";
909
1134
bool tempdir_created = false;
910
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
915
1140
bool gpgme_initialized = false;
916
1141
float delay = 2.5f;
917
1142
918
struct sigaction old_sigterm_action;
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
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
921
1167
{
922
1168
struct argp_option options[] = {
923
1169
{ .name = "debug", .key = 128,
952
1198
.arg = "SECONDS",
953
1199
.doc = "Maximum delay to wait for interface startup",
954
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 },
955
1210
{ .name = NULL }
956
1211
};
957
1212
958
1213
error_t parse_opt(int key, char *arg,
959
1214
struct argp_state *state){
1215
errno = 0;
960
1216
switch(key){
961
1217
case 128: /* --debug */
962
1218
debug = true;
978
1234
tmpmax = strtoimax(arg, &tmp, 10);
979
1235
if(errno != 0 or tmp == arg or *tmp != '\0'
980
1236
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1237
argp_error(state, "Bad number of DH bits");
983
1238
}
984
1239
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
1240
break;
990
1245
errno = 0;
991
1246
delay = strtof(arg, &tmp);
992
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
1248
argp_error(state, "Bad delay");
995
1249
}
996
1250
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
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);
1000
1264
break;
1001
1265
default:
1002
1266
return ARGP_ERR_UNKNOWN;
1003
1267
}
1004
return 0;
1268
return errno;
1005
1269
}
1006
1270
1007
1271
struct argp argp = { .options = options, .parser = parse_opt,
1008
1272
.args_doc = "",
1009
1273
.doc = "Mandos client -- Get and decrypt"
1010
1274
" passwords from a Mandos server" };
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;
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;
1015
1288
goto end;
1016
1289
}
1017
1290
}
1019
1292
if(not debug){
1020
1293
avahi_set_log_function(empty_log);
1021
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
}
1022
1320
1023
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1024
1322
from the signal handler */
1027
1325
mc.simple_poll = avahi_simple_poll_new();
1028
1326
if(mc.simple_poll == NULL){
1029
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1328
exitcode = EX_UNAVAILABLE;
1031
1329
goto end;
1032
1330
}
1033
1331
1035
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
1334
if(ret == -1){
1037
1335
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1336
exitcode = EX_OSERR;
1039
1337
goto end;
1040
1338
}
1041
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
1340
if(ret == -1){
1043
1341
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1342
exitcode = EX_OSERR;
1045
1343
goto end;
1046
1344
}
1047
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
1346
if(ret == -1){
1049
1347
perror("sigaddset");
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
}
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
}
1059
1394
1060
1395
/* If the interface is down, bring it up */
1061
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
1062
1415
#ifdef __linux__
1063
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1417
messages about the network interface to mess up the prompt */
1065
1418
ret = klogctl(8, NULL, 5);
1066
1419
bool restore_loglevel = true;
1067
1420
if(ret == -1){
1073
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
1427
if(sd < 0){
1075
1428
perror("socket");
1076
exitcode = EXIT_FAILURE;
1429
exitcode = EX_OSERR;
1077
1430
#ifdef __linux__
1078
1431
if(restore_loglevel){
1079
1432
ret = klogctl(7, NULL, 0);
1082
1435
}
1083
1436
}
1084
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1085
1444
goto end;
1086
1445
}
1087
1446
strcpy(network.ifr_name, interface);
1096
1455
}
1097
1456
}
1098
1457
#endif /* __linux__ */
1099
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
}
1100
1465
goto end;
1101
1466
}
1102
1467
if((network.ifr_flags & IFF_UP) == 0){
1103
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1104
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
1471
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1108
1475
#ifdef __linux__
1109
1476
if(restore_loglevel){
1110
1477
ret = klogctl(7, NULL, 0);
1113
1480
}
1114
1481
}
1115
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1116
1489
goto end;
1117
1490
}
1118
1491
}
1130
1503
perror("nanosleep");
1131
1504
}
1132
1505
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
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
}
1136
1512
}
1137
1513
#ifdef __linux__
1138
1514
if(restore_loglevel){
1143
1519
}
1144
1520
}
1145
1521
#endif /* __linux__ */
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");
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;
1160
1541
}
1161
1542
1162
1543
ret = init_gnutls_global(pubkey, seckey);
1163
1544
if(ret == -1){
1164
1545
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
1546
exitcode = EX_UNAVAILABLE;
1166
1547
goto end;
1167
1548
} else {
1168
1549
gnutls_initialized = true;
1169
1550
}
1170
1551
1552
if(quit_now){
1553
goto end;
1554
}
1555
1556
tempdir_created = true;
1171
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1172
1559
perror("mkdtemp");
1173
1560
goto end;
1174
1561
}
1175
tempdir_created = true;
1562
1563
if(quit_now){
1564
goto end;
1565
}
1176
1566
1177
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
1568
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
1569
exitcode = EX_UNAVAILABLE;
1180
1570
goto end;
1181
1571
} else {
1182
1572
gpgme_initialized = true;
1183
1573
}
1184
1574
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
}
1575
if(quit_now){
1576
goto end;
1192
1577
}
1193
1578
1194
1579
if(connect_to != NULL){
1197
1582
char *address = strrchr(connect_to, ':');
1198
1583
if(address == NULL){
1199
1584
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1585
exitcode = EX_USAGE;
1586
goto end;
1587
}
1588
1589
if(quit_now){
1590
goto end;
1591
}
1592
1203
1593
uint16_t port;
1204
1594
errno = 0;
1205
1595
tmpmax = strtoimax(address+1, &tmp, 10);
1206
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
1597
or tmpmax != (uint16_t)tmpmax){
1208
1598
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1599
exitcode = EX_USAGE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1212
1607
port = (uint16_t)tmpmax;
1213
1608
*address = '\0';
1214
1609
address = connect_to;
1219
1614
} else {
1220
1615
af = AF_INET;
1221
1616
}
1617
1618
if(quit_now){
1619
goto end;
1620
}
1621
1222
1622
ret = start_mandos_communication(address, port, if_index, af);
1223
1623
if(ret < 0){
1224
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
}
1225
1643
} else {
1226
1644
exitcode = EXIT_SUCCESS;
1227
1645
}
1228
1646
goto end;
1229
1647
}
1230
1648
1649
if(quit_now){
1650
goto end;
1651
}
1652
1231
1653
{
1232
1654
AvahiServerConfig config;
1233
1655
/* Do not publish any local Zeroconf records */
1250
1672
if(mc.server == NULL){
1251
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
1674
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1254
1680
goto end;
1255
1681
}
1256
1682
1261
1687
if(sb == NULL){
1262
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1263
1689
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1265
1695
goto end;
1266
1696
}
1267
1697
1299
1729
gpgme_release(mc.ctx);
1300
1730
}
1301
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
1302
1764
/* Removes the temp directory used by GPGME */
1303
1765
if(tempdir_created){
1304
1766
DIR *d;
1343
1805
}
1344
1806
}
1345
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
1346
1827
return exitcode;
1347
1828
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0