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- Committer: Björn Påhlsson
- Date: 2009-02-09 05:09:39 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: belorn@braxen-20090209050939-ml95liuwtbn9kjtb
plugin-runner: Added support for empty string arguments
Fixed bug where IP:port argument failed
mandos-client: Fixed bug where files wasnt removed after sigterm signal
Fixed bug where IP:port argument failed
mandos-client: Fixed bug where files wasnt removed after sigterm signal
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
59
56
#include <fcntl.h> /* open() */
60
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
60
#include <assert.h> /* assert() */
65
61
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time(), sleep() */
62
#include <time.h> /* nanosleep(), time() */
67
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
64
SIOCSIFFLAGS, if_indextoname(),
69
65
if_nametoindex(), IF_NAMESIZE */
71
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
68
*/
73
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
70
getuid(), getgid(), setuid(),
71
setgid() */
76
72
#include <arpa/inet.h> /* inet_pton(), htons */
77
73
#include <iso646.h> /* not, or, and */
78
74
#include <argp.h> /* struct argp_option, error_t, struct
79
75
argp_state, struct argp,
80
76
argp_parse(), ARGP_KEY_ARG,
81
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
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 */
87
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
88
79
#ifdef __linux__
89
80
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
81
#endif
91
82
92
83
/* Avahi */
93
84
/* All Avahi types, constants and functions
127
118
static const char mandos_protocol_version[] = "1";
128
119
const char *argp_program_version = "mandos-client " VERSION;
129
120
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
121
133
122
/* Used for passing in values through the Avahi callback functions */
134
123
typedef struct {
142
131
} mandos_context;
143
132
144
133
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
134
mandos_context mc;
151
135
152
136
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
155
* "buffer_length" is how much is already used.
137
* Make additional room in "buffer" for at least BUFFER_SIZE
138
* additional bytes. "buffer_capacity" is how much is currently
139
* allocated, "buffer_length" is how much is already used.
156
140
*/
157
141
size_t incbuffer(char **buffer, size_t buffer_length,
158
142
size_t buffer_capacity){
171
155
*/
172
156
static bool init_gpgme(const char *seckey,
173
157
const char *pubkey, const char *tempdir){
158
int ret;
174
159
gpgme_error_t rc;
175
160
gpgme_engine_info_t engine_info;
176
161
179
164
* Helper function to insert pub and seckey to the engine keyring.
180
165
*/
181
166
bool import_key(const char *filename){
182
int ret;
183
167
int fd;
184
168
gpgme_data_t pgp_data;
185
169
212
196
}
213
197
214
198
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
199
fprintf(stderr, "Initialize gpgme\n");
216
200
}
217
201
218
202
/* Init GPGME */
256
240
return false;
257
241
}
258
242
259
return true;
243
return true;
260
244
}
261
245
262
246
/*
316
300
}
317
301
gpgme_recipient_t recipient;
318
302
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;
303
if(recipient){
304
while(recipient != NULL){
305
fprintf(stderr, "Public key algorithm: %s\n",
306
gpgme_pubkey_algo_name(recipient->pubkey_algo));
307
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
308
fprintf(stderr, "Secret key available: %s\n",
309
recipient->status == GPG_ERR_NO_SECKEY
310
? "No" : "Yes");
311
recipient = recipient->next;
312
}
327
313
}
328
314
}
329
315
}
481
467
static int init_gnutls_session(gnutls_session_t *session){
482
468
int ret;
483
469
/* 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);
470
ret = gnutls_init(session, GNUTLS_SERVER);
490
471
if(ret != GNUTLS_E_SUCCESS){
491
472
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
473
safer_gnutls_strerror(ret));
494
475
495
476
{
496
477
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);
478
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
504
479
if(ret != GNUTLS_E_SUCCESS){
505
480
fprintf(stderr, "Syntax error at: %s\n", err);
506
481
fprintf(stderr, "GnuTLS error: %s\n",
510
485
}
511
486
}
512
487
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);
488
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
489
mc.cred);
521
490
if(ret != GNUTLS_E_SUCCESS){
522
491
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
492
safer_gnutls_strerror(ret));
526
495
}
527
496
528
497
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
498
gnutls_certificate_server_set_request(*session,
499
GNUTLS_CERT_IGNORE);
530
500
531
501
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
502
541
511
static int start_mandos_communication(const char *ip, uint16_t port,
542
512
AvahiIfIndex if_index,
543
513
int af){
544
int ret, tcp_sd = -1;
514
int ret, tcp_sd;
545
515
ssize_t sret;
546
516
union {
547
517
struct sockaddr_in in;
548
518
struct sockaddr_in6 in6;
549
519
} to;
550
520
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
521
char *decrypted_buffer;
552
522
size_t buffer_length = 0;
553
523
size_t buffer_capacity = 0;
524
ssize_t decrypted_buffer_size;
554
525
size_t written;
555
int retval = -1;
526
int retval = 0;
556
527
gnutls_session_t session;
557
528
int pf; /* Protocol family */
558
529
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
530
switch(af){
567
531
case AF_INET6:
568
532
pf = PF_INET6;
572
536
break;
573
537
default:
574
538
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
539
return -1;
577
540
}
578
541
588
551
589
552
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
553
if(tcp_sd < 0){
591
int e = errno;
592
554
perror("socket");
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
555
return -1;
600
556
}
601
557
602
558
memset(&to, 0, sizeof(to));
603
559
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
560
to.in6.sin6_family = (uint16_t)af;
605
561
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
562
} else { /* IPv4 */
607
563
to.in.sin_family = (sa_family_t)af;
608
564
ret = inet_pton(af, ip, &to.in.sin_addr);
609
565
}
610
566
if(ret < 0 ){
611
int e = errno;
612
567
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
568
return -1;
615
569
}
616
570
if(ret == 0){
617
int e = errno;
618
571
fprintf(stderr, "Bad address: %s\n", ip);
619
errno = e;
620
goto mandos_end;
572
return -1;
621
573
}
622
574
if(af == AF_INET6){
623
575
to.in6.sin6_port = htons(port); /* Spurious warnings from
630
582
if(if_index == AVAHI_IF_UNSPEC){
631
583
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
584
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
585
return -1;
635
586
}
636
587
/* Set the network interface number as scope */
637
588
to.in6.sin6_scope_id = (uint32_t)if_index;
642
593
-Wunreachable-code */
643
594
}
644
595
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
650
596
if(debug){
651
597
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
598
char interface[IF_NAMESIZE];
679
625
}
680
626
}
681
627
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
628
if(af == AF_INET6){
688
629
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
630
} else {
690
631
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
632
}
692
633
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
634
perror("connect");
635
return -1;
704
636
}
705
637
706
638
const char *out = mandos_protocol_version;
710
642
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
643
out_size - written));
712
644
if(ret == -1){
713
int e = errno;
714
645
perror("write");
715
errno = e;
646
retval = -1;
716
647
goto mandos_end;
717
648
}
718
649
written += (size_t)ret;
726
657
break;
727
658
}
728
659
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
660
}
735
661
736
662
if(debug){
737
663
fprintf(stderr, "Establishing TLS session with %s\n", ip);
738
664
}
739
665
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
666
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
667
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
668
do{
753
669
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
758
670
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
759
671
760
672
if(ret != GNUTLS_E_SUCCESS){
762
674
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
675
gnutls_perror(ret);
764
676
}
765
errno = EPROTO;
677
retval = -1;
766
678
goto mandos_end;
767
679
}
768
680
774
686
}
775
687
776
688
while(true){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
689
buffer_capacity = incbuffer(&buffer, buffer_length,
784
690
buffer_capacity);
785
691
if(buffer_capacity == 0){
786
int e = errno;
787
692
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
693
retval = -1;
794
694
goto mandos_end;
795
695
}
796
696
805
705
case GNUTLS_E_AGAIN:
806
706
break;
807
707
case GNUTLS_E_REHANDSHAKE:
808
do {
708
do{
809
709
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
710
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
711
if(ret < 0){
817
712
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
713
gnutls_perror(ret);
819
errno = EPROTO;
714
retval = -1;
820
715
goto mandos_end;
821
716
}
822
717
break;
823
718
default:
824
719
fprintf(stderr, "Unknown error while reading data from"
825
720
" encrypted session with Mandos server\n");
721
retval = -1;
826
722
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
828
723
goto mandos_end;
829
724
}
830
725
} else {
836
731
fprintf(stderr, "Closing TLS session\n");
837
732
}
838
733
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
844
do {
845
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
846
if(quit_now){
847
errno = EINTR;
848
goto mandos_end;
849
}
850
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
734
gnutls_bye(session, GNUTLS_SHUT_RDWR);
851
735
852
736
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
854
737
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
738
buffer_length,
856
739
&decrypted_buffer);
857
740
if(decrypted_buffer_size >= 0){
858
859
741
written = 0;
860
742
while(written < (size_t) decrypted_buffer_size){
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
743
ret = (int)fwrite(decrypted_buffer + written, 1,
867
744
(size_t)decrypted_buffer_size - written,
868
745
stdout);
869
746
if(ret == 0 and ferror(stdout)){
870
int e = errno;
871
747
if(debug){
872
748
fprintf(stderr, "Error writing encrypted data: %s\n",
873
749
strerror(errno));
874
750
}
875
errno = e;
876
goto mandos_end;
751
retval = -1;
752
break;
877
753
}
878
754
written += (size_t)ret;
879
755
}
880
retval = 0;
756
free(decrypted_buffer);
757
} else {
758
retval = -1;
881
759
}
760
} else {
761
retval = -1;
882
762
}
883
763
884
764
/* Shutdown procedure */
885
765
886
766
mandos_end:
887
{
888
int e = errno;
889
free(decrypted_buffer);
890
free(buffer);
891
if(tcp_sd >= 0){
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
893
}
894
if(ret == -1){
895
if(e == 0){
896
e = errno;
897
}
898
perror("close");
899
}
900
gnutls_deinit(session);
901
if(quit_now){
902
e = EINTR;
903
retval = -1;
904
}
905
errno = e;
767
free(buffer);
768
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
769
if(ret == -1){
770
perror("close");
906
771
}
772
gnutls_deinit(session);
907
773
return retval;
908
774
}
909
775
920
786
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
787
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
788
flags,
923
AVAHI_GCC_UNUSED void* userdata){
789
__attribute__((unused)) void* userdata){
924
790
assert(r);
925
791
926
792
/* Called whenever a service has been resolved successfully or
927
793
timed out */
928
794
929
if(quit_now){
930
return;
931
}
932
933
795
switch(event){
934
796
default:
935
797
case AVAHI_RESOLVER_FAILURE:
966
828
const char *domain,
967
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
830
flags,
969
AVAHI_GCC_UNUSED void* userdata){
831
__attribute__((unused)) void* userdata){
970
832
assert(b);
971
833
972
834
/* Called whenever a new services becomes available on the LAN or
973
835
is removed from the LAN */
974
836
975
if(quit_now){
976
return;
977
}
978
979
837
switch(event){
980
838
default:
981
839
case AVAHI_BROWSER_FAILURE:
991
849
the callback function is called the Avahi server will free the
992
850
resolver for us. */
993
851
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
852
if(!(avahi_s_service_resolver_new(mc.server, interface,
853
protocol, name, type, domain,
854
AVAHI_PROTO_INET6, 0,
855
resolve_callback, NULL)))
997
856
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
857
name, avahi_strerror(avahi_server_errno(mc.server)));
999
858
break;
1010
869
}
1011
870
}
1012
871
1013
/* stop main loop after sigterm has been called */
1014
static void handle_sigterm(int sig){
1015
if(quit_now){
1016
return;
1017
}
1018
quit_now = 1;
1019
signal_received = sig;
872
static void handle_sigterm(__attribute__((unused)) int sig){
1020
873
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
874
avahi_simple_poll_quit(mc.simple_poll);
1024
875
errno = old_errno;
1025
876
}
1026
877
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1120
}
1121
1122
878
int main(int argc, char *argv[]){
1123
879
AvahiSServiceBrowser *sb = NULL;
1124
880
int error;
1125
881
int ret;
1126
882
intmax_t tmpmax;
1127
char *tmp;
883
int numchars;
1128
884
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
885
const char *interface = "eth0";
1130
886
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
887
int sd;
1133
888
uid_t uid;
1134
889
gid_t gid;
890
char *connect_to = NULL;
1135
891
char tempdir[] = "/tmp/mandosXXXXXX";
1136
892
bool tempdir_created = false;
1137
893
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1140
896
1141
897
bool gnutls_initialized = false;
1142
898
bool gpgme_initialized = false;
1143
float delay = 2.5f;
1144
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
899
double delay = 2.5;
900
901
struct sigaction old_sigterm_action;
1146
902
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
/* Lower any group privileges we might have, just to be safe */
1152
errno = 0;
1153
ret = setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
/* Lower user privileges (temporarily) */
1159
errno = 0;
1160
ret = seteuid(uid);
1161
if(ret == -1){
1162
perror("seteuid");
1163
}
1164
1165
if(quit_now){
1166
goto end;
1167
}
903
904
/* Initialize mandos context */
905
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
906
.dh_bits = 1024, .priority = "SECURE256"
907
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1168
908
1169
909
{
1170
910
struct argp_option options[] = {
1200
940
.arg = "SECONDS",
1201
941
.doc = "Maximum delay to wait for interface startup",
1202
942
.group = 2 },
1203
/*
1204
* These reproduce what we would get without ARGP_NO_HELP
1205
*/
1206
{ .name = "help", .key = '?',
1207
.doc = "Give this help list", .group = -1 },
1208
{ .name = "usage", .key = -3,
1209
.doc = "Give a short usage message", .group = -1 },
1210
{ .name = "version", .key = 'V',
1211
.doc = "Print program version", .group = -1 },
1212
943
{ .name = NULL }
1213
944
};
1214
945
1215
946
error_t parse_opt(int key, char *arg,
1216
947
struct argp_state *state){
1217
errno = 0;
1218
948
switch(key){
1219
949
case 128: /* --debug */
1220
950
debug = true;
1232
962
pubkey = arg;
1233
963
break;
1234
964
case 129: /* --dh-bits */
1235
errno = 0;
1236
tmpmax = strtoimax(arg, &tmp, 10);
1237
if(errno != 0 or tmp == arg or *tmp != '\0'
1238
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1239
argp_error(state, "Bad number of DH bits");
965
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
966
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
967
or arg[numchars] != '\0'){
968
fprintf(stderr, "Bad number of DH bits\n");
969
exit(EXIT_FAILURE);
1240
970
}
1241
971
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1242
972
break;
1244
974
mc.priority = arg;
1245
975
break;
1246
976
case 131: /* --delay */
1247
errno = 0;
1248
delay = strtof(arg, &tmp);
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
argp_error(state, "Bad delay");
977
ret = sscanf(arg, "%lf%n", &delay, &numchars);
978
if(ret < 1 or arg[numchars] != '\0'){
979
fprintf(stderr, "Bad delay\n");
980
exit(EXIT_FAILURE);
1251
981
}
1252
982
break;
1253
/*
1254
* These reproduce what we would get without ARGP_NO_HELP
1255
*/
1256
case '?': /* --help */
1257
argp_state_help(state, state->out_stream,
1258
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1259
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1260
case -3: /* --usage */
1261
argp_state_help(state, state->out_stream,
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1265
exit(argp_err_exit_status);
983
case ARGP_KEY_ARG:
984
argp_usage(state);
985
case ARGP_KEY_END:
1266
986
break;
1267
987
default:
1268
988
return ARGP_ERR_UNKNOWN;
1269
989
}
1270
return errno;
990
return 0;
1271
991
}
1272
992
1273
993
struct argp argp = { .options = options, .parser = parse_opt,
1274
994
.args_doc = "",
1275
995
.doc = "Mandos client -- Get and decrypt"
1276
996
" passwords from a Mandos server" };
1277
ret = argp_parse(&argp, argc, argv,
1278
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1279
switch(ret){
1280
case 0:
1281
break;
1282
case ENOMEM:
1283
default:
1284
errno = ret;
1285
perror("argp_parse");
1286
exitcode = EX_OSERR;
1287
goto end;
1288
case EINVAL:
1289
exitcode = EX_USAGE;
1290
goto end;
1291
}
1292
}
1293
1294
if(not debug){
1295
avahi_set_log_function(empty_log);
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
997
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
998
if(ret == ARGP_ERR_UNKNOWN){
999
fprintf(stderr, "Unknown error while parsing arguments\n");
1318
1000
exitcode = EXIT_FAILURE;
1319
1001
goto end;
1320
1002
}
1321
1003
}
1322
1004
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
from the signal handler */
1325
/* Initialize the pseudo-RNG for Avahi */
1326
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1330
exitcode = EX_UNAVAILABLE;
1331
goto end;
1332
}
1333
1334
sigemptyset(&sigterm_action.sa_mask);
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
if(ret == -1){
1337
perror("sigaddset");
1338
exitcode = EX_OSERR;
1339
goto end;
1340
}
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
if(ret == -1){
1343
perror("sigaddset");
1344
exitcode = EX_OSERR;
1345
goto end;
1346
}
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
if(ret == -1){
1349
perror("sigaddset");
1350
exitcode = EX_OSERR;
1351
goto end;
1352
}
1353
/* Need to check if the handler is SIG_IGN before handling:
1354
| [[info:libc:Initial Signal Actions]] |
1355
| [[info:libc:Basic Signal Handling]] |
1356
*/
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
if(ret == -1){
1359
perror("sigaction");
1360
return EX_OSERR;
1361
}
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
if(ret == -1){
1365
perror("sigaction");
1366
exitcode = EX_OSERR;
1367
goto end;
1368
}
1369
}
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
if(ret == -1){
1372
perror("sigaction");
1373
return EX_OSERR;
1374
}
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
if(ret == -1){
1378
perror("sigaction");
1379
exitcode = EX_OSERR;
1380
goto end;
1381
}
1382
}
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
if(ret == -1){
1385
perror("sigaction");
1386
return EX_OSERR;
1387
}
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
1005
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1006
if(interface[0] != '\0'){
1417
1007
#ifdef __linux__
1418
1008
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1009
messages to mess up the prompt */
1420
1010
ret = klogctl(8, NULL, 5);
1421
1011
bool restore_loglevel = true;
1422
1012
if(ret == -1){
1423
1013
restore_loglevel = false;
1424
1014
perror("klogctl");
1425
1015
}
1426
#endif /* __linux__ */
1016
#endif
1427
1017
1428
1018
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
1019
if(sd < 0){
1430
1020
perror("socket");
1431
exitcode = EX_OSERR;
1021
exitcode = EXIT_FAILURE;
1432
1022
#ifdef __linux__
1433
1023
if(restore_loglevel){
1434
1024
ret = klogctl(7, NULL, 0);
1436
1026
perror("klogctl");
1437
1027
}
1438
1028
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1029
#endif
1446
1030
goto end;
1447
1031
}
1448
1032
strcpy(network.ifr_name, interface);
1456
1040
perror("klogctl");
1457
1041
}
1458
1042
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1043
#endif
1044
exitcode = EXIT_FAILURE;
1467
1045
goto end;
1468
1046
}
1469
1047
if((network.ifr_flags & IFF_UP) == 0){
1470
1048
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
1049
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
1050
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1051
perror("ioctl SIOCSIFFLAGS");
1052
exitcode = EXIT_FAILURE;
1477
1053
#ifdef __linux__
1478
1054
if(restore_loglevel){
1479
1055
ret = klogctl(7, NULL, 0);
1481
1057
perror("klogctl");
1482
1058
}
1483
1059
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1060
#endif
1491
1061
goto end;
1492
1062
}
1493
1063
}
1505
1075
perror("nanosleep");
1506
1076
}
1507
1077
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1078
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1079
if(ret == -1){
1080
perror("close");
1514
1081
}
1515
1082
#ifdef __linux__
1516
1083
if(restore_loglevel){
1520
1087
perror("klogctl");
1521
1088
}
1522
1089
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
1539
}
1540
1541
if(quit_now){
1542
goto end;
1090
#endif
1091
}
1092
1093
uid = getuid();
1094
gid = getgid();
1095
1096
errno = 0;
1097
setgid(gid);
1098
if(ret == -1){
1099
perror("setgid");
1100
}
1101
1102
ret = setuid(uid);
1103
if(ret == -1){
1104
perror("setuid");
1543
1105
}
1544
1106
1545
1107
ret = init_gnutls_global(pubkey, seckey);
1546
1108
if(ret == -1){
1547
1109
fprintf(stderr, "init_gnutls_global failed\n");
1548
exitcode = EX_UNAVAILABLE;
1110
exitcode = EXIT_FAILURE;
1549
1111
goto end;
1550
1112
} else {
1551
1113
gnutls_initialized = true;
1552
1114
}
1553
1115
1554
if(quit_now){
1555
goto end;
1556
}
1557
1558
tempdir_created = true;
1559
1116
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
1117
perror("mkdtemp");
1562
1118
goto end;
1563
1119
}
1564
1565
if(quit_now){
1566
goto end;
1567
}
1120
tempdir_created = true;
1568
1121
1569
1122
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
1123
fprintf(stderr, "init_gpgme failed\n");
1571
exitcode = EX_UNAVAILABLE;
1124
exitcode = EXIT_FAILURE;
1572
1125
goto end;
1573
1126
} else {
1574
1127
gpgme_initialized = true;
1575
1128
}
1576
1129
1577
if(quit_now){
1578
goto end;
1130
if(interface[0] != '\0'){
1131
if_index = (AvahiIfIndex) if_nametoindex(interface);
1132
if(if_index == 0){
1133
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
}
1579
1137
}
1580
1138
1581
1139
if(connect_to != NULL){
1584
1142
char *address = strrchr(connect_to, ':');
1585
1143
if(address == NULL){
1586
1144
fprintf(stderr, "No colon in address\n");
1587
exitcode = EX_USAGE;
1588
goto end;
1589
}
1590
1591
if(quit_now){
1592
goto end;
1593
}
1594
1145
exitcode = EXIT_FAILURE;
1146
goto end;
1147
}
1595
1148
uint16_t port;
1596
errno = 0;
1597
tmpmax = strtoimax(address+1, &tmp, 10);
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1149
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1150
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1151
or address[numchars+1] != '\0'){
1600
1152
fprintf(stderr, "Bad port number\n");
1601
exitcode = EX_USAGE;
1602
goto end;
1603
}
1604
1605
if(quit_now){
1606
goto end;
1607
}
1608
1153
exitcode = EXIT_FAILURE;
1154
goto end;
1155
}
1609
1156
port = (uint16_t)tmpmax;
1610
1157
*address = '\0';
1611
1158
address = connect_to;
1616
1163
} else {
1617
1164
af = AF_INET;
1618
1165
}
1619
1620
if(quit_now){
1621
goto end;
1622
}
1623
1624
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
1626
if(quit_now or ret == 0){
1627
break;
1628
}
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
1166
ret = start_mandos_communication(address, port, if_index,
1167
af);
1168
if(ret < 0){
1169
exitcode = EXIT_FAILURE;
1170
} else {
1633
1171
exitcode = EXIT_SUCCESS;
1634
1172
}
1635
1636
1173
goto end;
1637
1174
}
1638
1175
1639
if(quit_now){
1176
if(not debug){
1177
avahi_set_log_function(empty_log);
1178
}
1179
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1182
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;
1640
1188
goto end;
1641
1189
}
1642
1190
1662
1210
if(mc.server == NULL){
1663
1211
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
1212
avahi_strerror(error));
1665
exitcode = EX_UNAVAILABLE;
1666
goto end;
1667
}
1668
1669
if(quit_now){
1213
exitcode = EXIT_FAILURE;
1670
1214
goto end;
1671
1215
}
1672
1216
1673
1217
/* Create the Avahi service browser */
1674
1218
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
1676
1220
NULL, 0, browse_callback, NULL);
1677
1221
if(sb == NULL){
1678
1222
fprintf(stderr, "Failed to create service browser: %s\n",
1679
1223
avahi_strerror(avahi_server_errno(mc.server)));
1680
exitcode = EX_UNAVAILABLE;
1681
goto end;
1682
}
1683
1684
if(quit_now){
1685
goto end;
1686
}
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
1228
sigemptyset(&sigterm_action.sa_mask);
1229
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1230
if(ret == -1){
1231
perror("sigaddset");
1232
exitcode = EXIT_FAILURE;
1233
goto end;
1234
}
1235
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1236
if(ret == -1){
1237
perror("sigaction");
1238
exitcode = EXIT_FAILURE;
1239
goto end;
1240
}
1687
1241
1688
1242
/* Run the main loop */
1689
1243
1719
1273
gpgme_release(mc.ctx);
1720
1274
}
1721
1275
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
1276
/* Removes the temp directory used by GPGME */
1755
1277
if(tempdir_created){
1756
1278
DIR *d;
1795
1317
}
1796
1318
}
1797
1319
1798
if(quit_now){
1799
sigemptyset(&old_sigterm_action.sa_mask);
1800
old_sigterm_action.sa_handler = SIG_DFL;
1801
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1802
&old_sigterm_action,
1803
NULL));
1804
if(ret == -1){
1805
perror("sigaction");
1806
}
1807
do {
1808
ret = raise(signal_received);
1809
} while(ret != 0 and errno == EINTR);
1810
if(ret != 0){
1811
perror("raise");
1812
abort();
1813
}
1814
TEMP_FAILURE_RETRY(pause());
1815
}
1816
1817
1320
return exitcode;
1818
1321
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0