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» Revision
24.1.136
(compared to revision 237.7.32)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2009-02-09 19:34:28 UTC
- mfrom: (237.2.72 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20090209193428-2u3js3m87ckb84kc
merge
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
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
78
#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 */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
87
81
88
82
#ifdef __linux__
89
83
#include <sys/klog.h> /* klogctl() */
127
121
static const char mandos_protocol_version[] = "1";
128
122
const char *argp_program_version = "mandos-client " VERSION;
129
123
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
124
133
125
/* Used for passing in values through the Avahi callback functions */
134
126
typedef struct {
146
138
.dh_bits = 1024, .priority = "SECURE256"
147
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
140
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
152
141
/*
153
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
143
* bytes. "buffer_capacity" is how much is currently allocated,
171
160
*/
172
161
static bool init_gpgme(const char *seckey,
173
162
const char *pubkey, const char *tempdir){
163
int ret;
174
164
gpgme_error_t rc;
175
165
gpgme_engine_info_t engine_info;
176
166
179
169
* Helper function to insert pub and seckey to the engine keyring.
180
170
*/
181
171
bool import_key(const char *filename){
182
int ret;
183
172
int fd;
184
173
gpgme_data_t pgp_data;
185
174
256
245
return false;
257
246
}
258
247
259
return true;
248
return true;
260
249
}
261
250
262
251
/*
316
305
}
317
306
gpgme_recipient_t recipient;
318
307
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;
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
}
327
318
}
328
319
}
329
320
}
423
414
}
424
415
425
416
/* OpenPGP credentials */
426
ret = gnutls_certificate_allocate_credentials(&mc.cred);
417
gnutls_certificate_allocate_credentials(&mc.cred);
427
418
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n",
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
429
423
safer_gnutls_strerror(ret));
430
424
gnutls_global_deinit();
431
425
return -1;
478
472
static int init_gnutls_session(gnutls_session_t *session){
479
473
int ret;
480
474
/* GnuTLS session creation */
481
do {
482
ret = gnutls_init(session, GNUTLS_SERVER);
483
if(quit_now){
484
return -1;
485
}
486
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
475
ret = gnutls_init(session, GNUTLS_SERVER);
487
476
if(ret != GNUTLS_E_SUCCESS){
488
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
478
safer_gnutls_strerror(ret));
491
480
492
481
{
493
482
const char *err;
494
do {
495
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
496
if(quit_now){
497
gnutls_deinit(*session);
498
return -1;
499
}
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
501
484
if(ret != GNUTLS_E_SUCCESS){
502
485
fprintf(stderr, "Syntax error at: %s\n", err);
503
486
fprintf(stderr, "GnuTLS error: %s\n",
507
490
}
508
491
}
509
492
510
do {
511
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
512
mc.cred);
513
if(quit_now){
514
gnutls_deinit(*session);
515
return -1;
516
}
517
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
518
495
if(ret != GNUTLS_E_SUCCESS){
519
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
497
safer_gnutls_strerror(ret));
523
500
}
524
501
525
502
/* ignore client certificate if any. */
526
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
527
505
528
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
529
507
538
516
static int start_mandos_communication(const char *ip, uint16_t port,
539
517
AvahiIfIndex if_index,
540
518
int af){
541
int ret, tcp_sd = -1;
519
int ret, tcp_sd;
542
520
ssize_t sret;
543
521
union {
544
522
struct sockaddr_in in;
545
523
struct sockaddr_in6 in6;
546
524
} to;
547
525
char *buffer = NULL;
548
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
549
527
size_t buffer_length = 0;
550
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
551
530
size_t written;
552
int retval = -1;
531
int retval = 0;
553
532
gnutls_session_t session;
554
533
int pf; /* Protocol family */
555
534
556
errno = 0;
557
558
if(quit_now){
559
errno = EINTR;
560
return -1;
561
}
562
563
535
switch(af){
564
536
case AF_INET6:
565
537
pf = PF_INET6;
569
541
break;
570
542
default:
571
543
fprintf(stderr, "Bad address family: %d\n", af);
572
errno = EINVAL;
573
544
return -1;
574
545
}
575
546
585
556
586
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
587
558
if(tcp_sd < 0){
588
int e = errno;
589
559
perror("socket");
590
errno = e;
591
goto mandos_end;
592
}
593
594
if(quit_now){
595
errno = EINTR;
596
goto mandos_end;
560
return -1;
597
561
}
598
562
599
563
memset(&to, 0, sizeof(to));
600
564
if(af == AF_INET6){
601
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
602
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
603
567
} else { /* IPv4 */
604
568
to.in.sin_family = (sa_family_t)af;
605
569
ret = inet_pton(af, ip, &to.in.sin_addr);
606
570
}
607
571
if(ret < 0 ){
608
int e = errno;
609
572
perror("inet_pton");
610
errno = e;
611
goto mandos_end;
573
return -1;
612
574
}
613
575
if(ret == 0){
614
int e = errno;
615
576
fprintf(stderr, "Bad address: %s\n", ip);
616
errno = e;
617
goto mandos_end;
577
return -1;
618
578
}
619
579
if(af == AF_INET6){
620
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
627
587
if(if_index == AVAHI_IF_UNSPEC){
628
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
629
589
" without a network interface\n");
630
errno = EINVAL;
631
goto mandos_end;
590
return -1;
632
591
}
633
592
/* Set the network interface number as scope */
634
593
to.in6.sin6_scope_id = (uint32_t)if_index;
639
598
-Wunreachable-code */
640
599
}
641
600
642
if(quit_now){
643
errno = EINTR;
644
goto mandos_end;
645
}
646
647
601
if(debug){
648
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
649
603
char interface[IF_NAMESIZE];
676
630
}
677
631
}
678
632
679
if(quit_now){
680
errno = EINTR;
681
goto mandos_end;
682
}
683
684
633
if(af == AF_INET6){
685
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
686
635
} else {
687
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
688
637
}
689
638
if(ret < 0){
690
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
691
int e = errno;
692
perror("connect");
693
errno = e;
694
}
695
goto mandos_end;
696
}
697
698
if(quit_now){
699
errno = EINTR;
700
goto mandos_end;
639
perror("connect");
640
return -1;
701
641
}
702
642
703
643
const char *out = mandos_protocol_version;
707
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
708
648
out_size - written));
709
649
if(ret == -1){
710
int e = errno;
711
650
perror("write");
712
errno = e;
651
retval = -1;
713
652
goto mandos_end;
714
653
}
715
654
written += (size_t)ret;
723
662
break;
724
663
}
725
664
}
726
727
if(quit_now){
728
errno = EINTR;
729
goto mandos_end;
730
}
731
665
}
732
666
733
667
if(debug){
734
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
735
669
}
736
670
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
743
672
744
if(quit_now){
745
errno = EINTR;
746
goto mandos_end;
747
}
748
749
do {
673
do{
750
674
ret = gnutls_handshake(session);
751
if(quit_now){
752
errno = EINTR;
753
goto mandos_end;
754
}
755
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
756
676
757
677
if(ret != GNUTLS_E_SUCCESS){
759
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
760
680
gnutls_perror(ret);
761
681
}
762
errno = EPROTO;
682
retval = -1;
763
683
goto mandos_end;
764
684
}
765
685
771
691
}
772
692
773
693
while(true){
774
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
694
buffer_capacity = incbuffer(&buffer, buffer_length,
781
695
buffer_capacity);
782
696
if(buffer_capacity == 0){
783
int e = errno;
784
697
perror("incbuffer");
785
errno = e;
786
goto mandos_end;
787
}
788
789
if(quit_now){
790
errno = EINTR;
698
retval = -1;
791
699
goto mandos_end;
792
700
}
793
701
802
710
case GNUTLS_E_AGAIN:
803
711
break;
804
712
case GNUTLS_E_REHANDSHAKE:
805
do {
713
do{
806
714
ret = gnutls_handshake(session);
807
808
if(quit_now){
809
errno = EINTR;
810
goto mandos_end;
811
}
812
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
716
if(ret < 0){
814
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
815
718
gnutls_perror(ret);
816
errno = EPROTO;
719
retval = -1;
817
720
goto mandos_end;
818
721
}
819
722
break;
820
723
default:
821
724
fprintf(stderr, "Unknown error while reading data from"
822
725
" encrypted session with Mandos server\n");
726
retval = -1;
823
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
824
errno = EIO;
825
728
goto mandos_end;
826
729
}
827
730
} else {
833
736
fprintf(stderr, "Closing TLS session\n");
834
737
}
835
738
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
do {
842
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
848
740
849
741
if(buffer_length > 0){
850
ssize_t decrypted_buffer_size;
851
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
852
743
buffer_length,
853
744
&decrypted_buffer);
854
745
if(decrypted_buffer_size >= 0){
855
856
746
written = 0;
857
747
while(written < (size_t) decrypted_buffer_size){
858
if(quit_now){
859
errno = EINTR;
860
goto mandos_end;
861
}
862
863
748
ret = (int)fwrite(decrypted_buffer + written, 1,
864
749
(size_t)decrypted_buffer_size - written,
865
750
stdout);
866
751
if(ret == 0 and ferror(stdout)){
867
int e = errno;
868
752
if(debug){
869
753
fprintf(stderr, "Error writing encrypted data: %s\n",
870
754
strerror(errno));
871
755
}
872
errno = e;
873
goto mandos_end;
756
retval = -1;
757
break;
874
758
}
875
759
written += (size_t)ret;
876
760
}
877
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
878
764
}
765
} else {
766
retval = -1;
879
767
}
880
768
881
769
/* Shutdown procedure */
882
770
883
771
mandos_end:
884
{
885
int e = errno;
886
free(decrypted_buffer);
887
free(buffer);
888
if(tcp_sd >= 0){
889
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
890
}
891
if(ret == -1){
892
if(e == 0){
893
e = errno;
894
}
895
perror("close");
896
}
897
gnutls_deinit(session);
898
if(quit_now){
899
e = EINTR;
900
retval = -1;
901
}
902
errno = e;
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
903
776
}
777
gnutls_deinit(session);
904
778
return retval;
905
779
}
906
780
923
797
/* Called whenever a service has been resolved successfully or
924
798
timed out */
925
799
926
if(quit_now){
927
return;
928
}
929
930
800
switch(event){
931
801
default:
932
802
case AVAHI_RESOLVER_FAILURE:
969
839
/* Called whenever a new services becomes available on the LAN or
970
840
is removed from the LAN */
971
841
972
if(quit_now){
973
return;
974
}
975
976
842
switch(event){
977
843
default:
978
844
case AVAHI_BROWSER_FAILURE:
988
854
the callback function is called the Avahi server will free the
989
855
resolver for us. */
990
856
991
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
992
name, type, domain, protocol, 0,
993
resolve_callback, NULL) == NULL)
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
994
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
995
862
name, avahi_strerror(avahi_server_errno(mc.server)));
996
863
break;
1007
874
}
1008
875
}
1009
876
877
sig_atomic_t quit_now = 0;
878
1010
879
/* stop main loop after sigterm has been called */
1011
static void handle_sigterm(int sig){
880
static void handle_sigterm(__attribute__((unused)) int sig){
1012
881
if(quit_now){
1013
882
return;
1014
883
}
1015
884
quit_now = 1;
1016
signal_received = sig;
1017
885
int old_errno = errno;
1018
886
if(mc.simple_poll != NULL){
1019
887
avahi_simple_poll_quit(mc.simple_poll);
1021
889
errno = old_errno;
1022
890
}
1023
891
1024
/*
1025
* This function determines if a directory entry in /sys/class/net
1026
* corresponds to an acceptable network device.
1027
* (This function is passed to scandir(3) as a filter function.)
1028
*/
1029
int good_interface(const struct dirent *if_entry){
1030
ssize_t ssret;
1031
char *flagname = NULL;
1032
if(if_entry->d_name[0] == '.'){
1033
return 0;
1034
}
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
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1042
if(flags_fd == -1){
1043
perror("open");
1044
free(flagname);
1045
return 0;
1046
}
1047
free(flagname);
1048
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1049
/* read line from flags_fd */
1050
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1052
flagstring[(size_t)to_read] = '\0';
1053
if(flagstring == NULL){
1054
perror("malloc");
1055
close(flags_fd);
1056
return 0;
1057
}
1058
while(to_read > 0){
1059
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1060
(size_t)to_read));
1061
if(ssret == -1){
1062
perror("read");
1063
free(flagstring);
1064
close(flags_fd);
1065
return 0;
1066
}
1067
to_read -= ssret;
1068
if(ssret == 0){
1069
break;
1070
}
1071
}
1072
close(flags_fd);
1073
intmax_t tmpmax;
1074
char *tmp;
1075
errno = 0;
1076
tmpmax = strtoimax(flagstring, &tmp, 0);
1077
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1078
and not (isspace(*tmp)))
1079
or tmpmax != (ifreq_flags)tmpmax){
1080
if(debug){
1081
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1082
flagstring, if_entry->d_name);
1083
}
1084
free(flagstring);
1085
return 0;
1086
}
1087
free(flagstring);
1088
ifreq_flags flags = (ifreq_flags)tmpmax;
1089
/* Reject the loopback device */
1090
if(flags & IFF_LOOPBACK){
1091
if(debug){
1092
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1093
if_entry->d_name);
1094
}
1095
return 0;
1096
}
1097
/* Accept point-to-point devices only if connect_to is specified */
1098
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1099
if(debug){
1100
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1101
if_entry->d_name);
1102
}
1103
return 1;
1104
}
1105
/* Otherwise, reject non-broadcast-capable devices */
1106
if(not (flags & IFF_BROADCAST)){
1107
if(debug){
1108
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1109
if_entry->d_name);
1110
}
1111
return 0;
1112
}
1113
/* Reject non-ARP interfaces (including dummy interfaces) */
1114
if(flags & IFF_NOARP){
1115
if(debug){
1116
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1117
if_entry->d_name);
1118
}
1119
return 0;
1120
}
1121
/* Accept this device */
1122
if(debug){
1123
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1124
if_entry->d_name);
1125
}
1126
return 1;
1127
}
1128
1129
892
int main(int argc, char *argv[]){
1130
893
AvahiSServiceBrowser *sb = NULL;
1131
894
int error;
1132
895
int ret;
1133
896
intmax_t tmpmax;
1134
char *tmp;
897
int numchars;
1135
898
int exitcode = EXIT_SUCCESS;
1136
const char *interface = "";
899
const char *interface = "eth0";
1137
900
struct ifreq network;
1138
int sd = -1;
1139
bool take_down_interface = false;
901
int sd;
1140
902
uid_t uid;
1141
903
gid_t gid;
904
char *connect_to = NULL;
1142
905
char tempdir[] = "/tmp/mandosXXXXXX";
1143
906
bool tempdir_created = false;
1144
907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1145
908
const char *seckey = PATHDIR "/" SECKEY;
1146
909
const char *pubkey = PATHDIR "/" PUBKEY;
1147
910
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1148
915
bool gnutls_initialized = false;
1149
916
bool gpgme_initialized = false;
1150
float delay = 2.5f;
1151
1152
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
917
double delay = 2.5;
918
919
struct sigaction old_sigterm_action;
1153
920
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1154
921
1155
uid = getuid();
1156
gid = getgid();
1157
1158
/* Lower any group privileges we might have, just to be safe */
1159
errno = 0;
1160
ret = setgid(gid);
1161
if(ret == -1){
1162
perror("setgid");
1163
}
1164
1165
/* Lower user privileges (temporarily) */
1166
errno = 0;
1167
ret = seteuid(uid);
1168
if(ret == -1){
1169
perror("seteuid");
1170
}
1171
1172
if(quit_now){
1173
goto end;
1174
}
1175
1176
922
{
1177
923
struct argp_option options[] = {
1178
924
{ .name = "debug", .key = 128,
1207
953
.arg = "SECONDS",
1208
954
.doc = "Maximum delay to wait for interface startup",
1209
955
.group = 2 },
1210
/*
1211
* These reproduce what we would get without ARGP_NO_HELP
1212
*/
1213
{ .name = "help", .key = '?',
1214
.doc = "Give this help list", .group = -1 },
1215
{ .name = "usage", .key = -3,
1216
.doc = "Give a short usage message", .group = -1 },
1217
{ .name = "version", .key = 'V',
1218
.doc = "Print program version", .group = -1 },
1219
956
{ .name = NULL }
1220
957
};
1221
958
1222
959
error_t parse_opt(int key, char *arg,
1223
960
struct argp_state *state){
1224
errno = 0;
1225
961
switch(key){
1226
962
case 128: /* --debug */
1227
963
debug = true;
1239
975
pubkey = arg;
1240
976
break;
1241
977
case 129: /* --dh-bits */
1242
errno = 0;
1243
tmpmax = strtoimax(arg, &tmp, 10);
1244
if(errno != 0 or tmp == arg or *tmp != '\0'
1245
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1246
argp_error(state, "Bad number of DH bits");
978
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
979
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
980
or arg[numchars] != '\0'){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1247
983
}
1248
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1249
985
break;
1251
987
mc.priority = arg;
1252
988
break;
1253
989
case 131: /* --delay */
1254
errno = 0;
1255
delay = strtof(arg, &tmp);
1256
if(errno != 0 or tmp == arg or *tmp != '\0'){
1257
argp_error(state, "Bad delay");
990
ret = sscanf(arg, "%lf%n", &delay, &numchars);
991
if(ret < 1 or arg[numchars] != '\0'){
992
fprintf(stderr, "Bad delay\n");
993
exit(EXIT_FAILURE);
1258
994
}
1259
995
break;
1260
/*
1261
* These reproduce what we would get without ARGP_NO_HELP
1262
*/
1263
case '?': /* --help */
1264
argp_state_help(state, state->out_stream,
1265
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1266
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1267
case -3: /* --usage */
1268
argp_state_help(state, state->out_stream,
1269
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1270
case 'V': /* --version */
1271
fprintf(state->out_stream, "%s\n", argp_program_version);
1272
exit(argp_err_exit_status);
996
case ARGP_KEY_ARG:
997
argp_usage(state);
998
case ARGP_KEY_END:
1273
999
break;
1274
1000
default:
1275
1001
return ARGP_ERR_UNKNOWN;
1276
1002
}
1277
return errno;
1003
return 0;
1278
1004
}
1279
1005
1280
1006
struct argp argp = { .options = options, .parser = parse_opt,
1281
1007
.args_doc = "",
1282
1008
.doc = "Mandos client -- Get and decrypt"
1283
1009
" passwords from a Mandos server" };
1284
ret = argp_parse(&argp, argc, argv,
1285
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1286
switch(ret){
1287
case 0:
1288
break;
1289
case ENOMEM:
1290
default:
1291
errno = ret;
1292
perror("argp_parse");
1293
exitcode = EX_OSERR;
1294
goto end;
1295
case EINVAL:
1296
exitcode = EX_USAGE;
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1297
1014
goto end;
1298
1015
}
1299
1016
}
1301
1018
if(not debug){
1302
1019
avahi_set_log_function(empty_log);
1303
1020
}
1304
1305
if(interface[0] == '\0'){
1306
struct dirent **direntries;
1307
ret = scandir(sys_class_net, &direntries, good_interface,
1308
alphasort);
1309
if(ret >= 1){
1310
/* Pick the first good interface */
1311
interface = strdup(direntries[0]->d_name);
1312
if(debug){
1313
fprintf(stderr, "Using interface \"%s\"\n", interface);
1314
}
1315
if(interface == NULL){
1316
perror("malloc");
1317
free(direntries);
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
free(direntries);
1322
} else {
1323
free(direntries);
1324
fprintf(stderr, "Could not find a network interface\n");
1325
exitcode = EXIT_FAILURE;
1326
goto end;
1327
}
1328
}
1329
1021
1330
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1331
1023
from the signal handler */
1334
1026
mc.simple_poll = avahi_simple_poll_new();
1335
1027
if(mc.simple_poll == NULL){
1336
1028
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1337
exitcode = EX_UNAVAILABLE;
1029
exitcode = EXIT_FAILURE;
1338
1030
goto end;
1339
1031
}
1340
1032
1342
1034
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1343
1035
if(ret == -1){
1344
1036
perror("sigaddset");
1345
exitcode = EX_OSERR;
1037
exitcode = EXIT_FAILURE;
1346
1038
goto end;
1347
1039
}
1348
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1349
1041
if(ret == -1){
1350
1042
perror("sigaddset");
1351
exitcode = EX_OSERR;
1043
exitcode = EXIT_FAILURE;
1352
1044
goto end;
1353
1045
}
1354
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1355
1047
if(ret == -1){
1356
1048
perror("sigaddset");
1357
exitcode = EX_OSERR;
1358
goto end;
1359
}
1360
/* Need to check if the handler is SIG_IGN before handling:
1361
| [[info:libc:Initial Signal Actions]] |
1362
| [[info:libc:Basic Signal Handling]] |
1363
*/
1364
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1365
if(ret == -1){
1366
perror("sigaction");
1367
return EX_OSERR;
1368
}
1369
if(old_sigterm_action.sa_handler != SIG_IGN){
1370
ret = sigaction(SIGINT, &sigterm_action, NULL);
1371
if(ret == -1){
1372
perror("sigaction");
1373
exitcode = EX_OSERR;
1374
goto end;
1375
}
1376
}
1377
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1378
if(ret == -1){
1379
perror("sigaction");
1380
return EX_OSERR;
1381
}
1382
if(old_sigterm_action.sa_handler != SIG_IGN){
1383
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1384
if(ret == -1){
1385
perror("sigaction");
1386
exitcode = EX_OSERR;
1387
goto end;
1388
}
1389
}
1390
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1391
if(ret == -1){
1392
perror("sigaction");
1393
return EX_OSERR;
1394
}
1395
if(old_sigterm_action.sa_handler != SIG_IGN){
1396
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1397
if(ret == -1){
1398
perror("sigaction");
1399
exitcode = EX_OSERR;
1400
goto end;
1401
}
1402
}
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1403
1058
1404
1059
/* If the interface is down, bring it up */
1405
if(strcmp(interface, "none") != 0){
1406
if_index = (AvahiIfIndex) if_nametoindex(interface);
1407
if(if_index == 0){
1408
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1409
exitcode = EX_UNAVAILABLE;
1410
goto end;
1411
}
1412
1413
if(quit_now){
1414
goto end;
1415
}
1416
1417
/* Re-raise priviliges */
1418
errno = 0;
1419
ret = seteuid(0);
1420
if(ret == -1){
1421
perror("seteuid");
1422
}
1423
1060
if(interface[0] != '\0'){
1424
1061
#ifdef __linux__
1425
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1426
messages about the network interface to mess up the prompt */
1063
messages to mess up the prompt */
1427
1064
ret = klogctl(8, NULL, 5);
1428
1065
bool restore_loglevel = true;
1429
1066
if(ret == -1){
1435
1072
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1436
1073
if(sd < 0){
1437
1074
perror("socket");
1438
exitcode = EX_OSERR;
1075
exitcode = EXIT_FAILURE;
1439
1076
#ifdef __linux__
1440
1077
if(restore_loglevel){
1441
1078
ret = klogctl(7, NULL, 0);
1444
1081
}
1445
1082
}
1446
1083
#endif /* __linux__ */
1447
/* Lower privileges */
1448
errno = 0;
1449
ret = seteuid(uid);
1450
if(ret == -1){
1451
perror("seteuid");
1452
}
1453
1084
goto end;
1454
1085
}
1455
1086
strcpy(network.ifr_name, interface);
1464
1095
}
1465
1096
}
1466
1097
#endif /* __linux__ */
1467
exitcode = EX_OSERR;
1468
/* Lower privileges */
1469
errno = 0;
1470
ret = seteuid(uid);
1471
if(ret == -1){
1472
perror("seteuid");
1473
}
1098
exitcode = EXIT_FAILURE;
1474
1099
goto end;
1475
1100
}
1476
1101
if((network.ifr_flags & IFF_UP) == 0){
1477
1102
network.ifr_flags |= IFF_UP;
1478
take_down_interface = true;
1479
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1480
1104
if(ret == -1){
1481
take_down_interface = false;
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1483
exitcode = EX_OSERR;
1105
perror("ioctl SIOCSIFFLAGS");
1106
exitcode = EXIT_FAILURE;
1484
1107
#ifdef __linux__
1485
1108
if(restore_loglevel){
1486
1109
ret = klogctl(7, NULL, 0);
1489
1112
}
1490
1113
}
1491
1114
#endif /* __linux__ */
1492
/* Lower privileges */
1493
errno = 0;
1494
ret = seteuid(uid);
1495
if(ret == -1){
1496
perror("seteuid");
1497
}
1498
1115
goto end;
1499
1116
}
1500
1117
}
1512
1129
perror("nanosleep");
1513
1130
}
1514
1131
}
1515
if(not take_down_interface){
1516
/* We won't need the socket anymore */
1517
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1518
if(ret == -1){
1519
perror("close");
1520
}
1132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1133
if(ret == -1){
1134
perror("close");
1521
1135
}
1522
1136
#ifdef __linux__
1523
1137
if(restore_loglevel){
1528
1142
}
1529
1143
}
1530
1144
#endif /* __linux__ */
1531
/* Lower privileges */
1532
errno = 0;
1533
if(take_down_interface){
1534
/* Lower privileges */
1535
ret = seteuid(uid);
1536
if(ret == -1){
1537
perror("seteuid");
1538
}
1539
} else {
1540
/* Lower privileges permanently */
1541
ret = setuid(uid);
1542
if(ret == -1){
1543
perror("setuid");
1544
}
1545
}
1546
}
1547
1548
if(quit_now){
1549
goto end;
1145
}
1146
1147
uid = getuid();
1148
gid = getgid();
1149
1150
errno = 0;
1151
setgid(gid);
1152
if(ret == -1){
1153
perror("setgid");
1154
}
1155
1156
ret = setuid(uid);
1157
if(ret == -1){
1158
perror("setuid");
1550
1159
}
1551
1160
1552
1161
ret = init_gnutls_global(pubkey, seckey);
1553
1162
if(ret == -1){
1554
1163
fprintf(stderr, "init_gnutls_global failed\n");
1555
exitcode = EX_UNAVAILABLE;
1164
exitcode = EXIT_FAILURE;
1556
1165
goto end;
1557
1166
} else {
1558
1167
gnutls_initialized = true;
1559
1168
}
1560
1169
1561
if(quit_now){
1562
goto end;
1563
}
1564
1565
tempdir_created = true;
1566
1170
if(mkdtemp(tempdir) == NULL){
1567
tempdir_created = false;
1568
1171
perror("mkdtemp");
1569
1172
goto end;
1570
1173
}
1571
1572
if(quit_now){
1573
goto end;
1574
}
1174
tempdir_created = true;
1575
1175
1576
1176
if(not init_gpgme(pubkey, seckey, tempdir)){
1577
1177
fprintf(stderr, "init_gpgme failed\n");
1578
exitcode = EX_UNAVAILABLE;
1178
exitcode = EXIT_FAILURE;
1579
1179
goto end;
1580
1180
} else {
1581
1181
gpgme_initialized = true;
1582
1182
}
1583
1183
1584
if(quit_now){
1585
goto end;
1184
if(interface[0] != '\0'){
1185
if_index = (AvahiIfIndex) if_nametoindex(interface);
1186
if(if_index == 0){
1187
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1188
exitcode = EXIT_FAILURE;
1189
goto end;
1190
}
1586
1191
}
1587
1192
1588
1193
if(connect_to != NULL){
1591
1196
char *address = strrchr(connect_to, ':');
1592
1197
if(address == NULL){
1593
1198
fprintf(stderr, "No colon in address\n");
1594
exitcode = EX_USAGE;
1595
goto end;
1596
}
1597
1598
if(quit_now){
1599
goto end;
1600
}
1601
1199
exitcode = EXIT_FAILURE;
1200
goto end;
1201
}
1602
1202
uint16_t port;
1603
errno = 0;
1604
tmpmax = strtoimax(address+1, &tmp, 10);
1605
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1606
or tmpmax != (uint16_t)tmpmax){
1203
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1204
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1205
or address[numchars+1] != '\0'){
1607
1206
fprintf(stderr, "Bad port number\n");
1608
exitcode = EX_USAGE;
1609
goto end;
1610
}
1611
1612
if(quit_now){
1613
goto end;
1614
}
1615
1207
exitcode = EXIT_FAILURE;
1208
goto end;
1209
}
1616
1210
port = (uint16_t)tmpmax;
1617
1211
*address = '\0';
1618
1212
address = connect_to;
1623
1217
} else {
1624
1218
af = AF_INET;
1625
1219
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
while(not quit_now){
1632
ret = start_mandos_communication(address, port, if_index, af);
1633
if(quit_now or ret == 0){
1634
break;
1635
}
1636
sleep(15);
1637
};
1638
1639
if (not quit_now){
1220
ret = start_mandos_communication(address, port, if_index, af);
1221
if(ret < 0){
1222
exitcode = EXIT_FAILURE;
1223
} else {
1640
1224
exitcode = EXIT_SUCCESS;
1641
1225
}
1642
1643
goto end;
1644
}
1645
1646
if(quit_now){
1647
goto end;
1648
}
1649
1226
goto end;
1227
}
1228
1650
1229
{
1651
1230
AvahiServerConfig config;
1652
1231
/* Do not publish any local Zeroconf records */
1669
1248
if(mc.server == NULL){
1670
1249
fprintf(stderr, "Failed to create Avahi server: %s\n",
1671
1250
avahi_strerror(error));
1672
exitcode = EX_UNAVAILABLE;
1673
goto end;
1674
}
1675
1676
if(quit_now){
1251
exitcode = EXIT_FAILURE;
1677
1252
goto end;
1678
1253
}
1679
1254
1680
1255
/* Create the Avahi service browser */
1681
1256
sb = avahi_s_service_browser_new(mc.server, if_index,
1682
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1257
AVAHI_PROTO_INET6, "_mandos._tcp",
1683
1258
NULL, 0, browse_callback, NULL);
1684
1259
if(sb == NULL){
1685
1260
fprintf(stderr, "Failed to create service browser: %s\n",
1686
1261
avahi_strerror(avahi_server_errno(mc.server)));
1687
exitcode = EX_UNAVAILABLE;
1688
goto end;
1689
}
1690
1691
if(quit_now){
1262
exitcode = EXIT_FAILURE;
1692
1263
goto end;
1693
1264
}
1694
1265
1726
1297
gpgme_release(mc.ctx);
1727
1298
}
1728
1299
1729
/* Take down the network interface */
1730
if(take_down_interface){
1731
/* Re-raise priviliges */
1732
errno = 0;
1733
ret = seteuid(0);
1734
if(ret == -1){
1735
perror("seteuid");
1736
}
1737
if(geteuid() == 0){
1738
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1739
if(ret == -1){
1740
perror("ioctl SIOCGIFFLAGS");
1741
} else if(network.ifr_flags & IFF_UP) {
1742
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1743
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1744
if(ret == -1){
1745
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1746
}
1747
}
1748
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1749
if(ret == -1){
1750
perror("close");
1751
}
1752
/* Lower privileges permanently */
1753
errno = 0;
1754
ret = setuid(uid);
1755
if(ret == -1){
1756
perror("setuid");
1757
}
1758
}
1759
}
1760
1761
1300
/* Removes the temp directory used by GPGME */
1762
1301
if(tempdir_created){
1763
1302
DIR *d;
1802
1341
}
1803
1342
}
1804
1343
1805
if(quit_now){
1806
sigemptyset(&old_sigterm_action.sa_mask);
1807
old_sigterm_action.sa_handler = SIG_DFL;
1808
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1809
&old_sigterm_action,
1810
NULL));
1811
if(ret == -1){
1812
perror("sigaction");
1813
}
1814
do {
1815
ret = raise(signal_received);
1816
} while(ret != 0 and errno == EINTR);
1817
if(ret != 0){
1818
perror("raise");
1819
abort();
1820
}
1821
TEMP_FAILURE_RETRY(pause());
1822
}
1823
1824
1344
return exitcode;
1825
1345
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0