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- Committer: teddy at bsnet
- Date: 2010-09-15 17:17:46 UTC
- Revision ID: teddy@fukt.bsnet.se-20100915171746-bg5cppurdd0pcvcy
* debian/watch: Also watch for "*.tar.xz" files.
* plugins.d/plymouth.c (getargv): Use argz_count() and argz_extract().
* plugins.d/usplash.c (main): - '' -
* plugins.d/plymouth.c (getargv): Use argz_count() and argz_extract().
* plugins.d/usplash.c (main): - '' -
added
removed
plugins.d/mandos-client.c
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
56
59
#include <fcntl.h> /* open() */
57
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
61
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
65
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
66
#include <time.h> /* nanosleep(), time(), sleep() */
63
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
68
SIOCSIFFLAGS, if_indextoname(),
65
69
if_nametoindex(), IF_NAMESIZE */
67
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
72
*/
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
75
79
argp_state, struct argp,
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
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
79
88
#ifdef __linux__
80
89
#include <sys/klog.h> /* klogctl() */
81
#endif
90
#endif /* __linux__ */
82
91
83
92
/* Avahi */
84
93
/* All Avahi types, constants and functions
118
127
static const char mandos_protocol_version[] = "1";
119
128
const char *argp_program_version = "mandos-client " VERSION;
120
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;
121
132
122
133
/* Used for passing in values through the Avahi callback functions */
123
134
typedef struct {
131
142
} mandos_context;
132
143
133
144
/* global context so signal handler can reach it*/
134
mandos_context mc;
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;
135
151
136
152
/*
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.
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.
140
156
*/
141
157
size_t incbuffer(char **buffer, size_t buffer_length,
142
158
size_t buffer_capacity){
155
171
*/
156
172
static bool init_gpgme(const char *seckey,
157
173
const char *pubkey, const char *tempdir){
158
int ret;
159
174
gpgme_error_t rc;
160
175
gpgme_engine_info_t engine_info;
161
176
164
179
* Helper function to insert pub and seckey to the engine keyring.
165
180
*/
166
181
bool import_key(const char *filename){
182
int ret;
167
183
int fd;
168
184
gpgme_data_t pgp_data;
169
185
196
212
}
197
213
198
214
if(debug){
199
fprintf(stderr, "Initialize gpgme\n");
215
fprintf(stderr, "Initializing GPGME\n");
200
216
}
201
217
202
218
/* Init GPGME */
240
256
return false;
241
257
}
242
258
243
return true;
259
return true;
244
260
}
245
261
246
262
/*
300
316
}
301
317
gpgme_recipient_t recipient;
302
318
recipient = result->recipients;
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
}
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;
313
327
}
314
328
}
315
329
}
467
481
static int init_gnutls_session(gnutls_session_t *session){
468
482
int ret;
469
483
/* GnuTLS session creation */
470
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);
471
490
if(ret != GNUTLS_E_SUCCESS){
472
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
473
492
safer_gnutls_strerror(ret));
475
494
476
495
{
477
496
const char *err;
478
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);
479
504
if(ret != GNUTLS_E_SUCCESS){
480
505
fprintf(stderr, "Syntax error at: %s\n", err);
481
506
fprintf(stderr, "GnuTLS error: %s\n",
485
510
}
486
511
}
487
512
488
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
489
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);
490
521
if(ret != GNUTLS_E_SUCCESS){
491
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
492
523
safer_gnutls_strerror(ret));
495
526
}
496
527
497
528
/* ignore client certificate if any. */
498
gnutls_certificate_server_set_request(*session,
499
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
500
530
501
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
502
532
511
541
static int start_mandos_communication(const char *ip, uint16_t port,
512
542
AvahiIfIndex if_index,
513
543
int af){
514
int ret, tcp_sd;
544
int ret, tcp_sd = -1;
515
545
ssize_t sret;
516
546
union {
517
547
struct sockaddr_in in;
518
548
struct sockaddr_in6 in6;
519
549
} to;
520
550
char *buffer = NULL;
521
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
522
552
size_t buffer_length = 0;
523
553
size_t buffer_capacity = 0;
524
ssize_t decrypted_buffer_size;
525
554
size_t written;
526
int retval = 0;
555
int retval = -1;
527
556
gnutls_session_t session;
528
557
int pf; /* Protocol family */
529
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
530
566
switch(af){
531
567
case AF_INET6:
532
568
pf = PF_INET6;
536
572
break;
537
573
default:
538
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
539
576
return -1;
540
577
}
541
578
551
588
552
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
553
590
if(tcp_sd < 0){
591
int e = errno;
554
592
perror("socket");
555
return -1;
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
556
600
}
557
601
558
602
memset(&to, 0, sizeof(to));
559
603
if(af == AF_INET6){
560
to.in6.sin6_family = (uint16_t)af;
604
to.in6.sin6_family = (sa_family_t)af;
561
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
562
606
} else { /* IPv4 */
563
607
to.in.sin_family = (sa_family_t)af;
564
608
ret = inet_pton(af, ip, &to.in.sin_addr);
565
609
}
566
610
if(ret < 0 ){
611
int e = errno;
567
612
perror("inet_pton");
568
return -1;
613
errno = e;
614
goto mandos_end;
569
615
}
570
616
if(ret == 0){
617
int e = errno;
571
618
fprintf(stderr, "Bad address: %s\n", ip);
572
return -1;
619
errno = e;
620
goto mandos_end;
573
621
}
574
622
if(af == AF_INET6){
575
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
582
630
if(if_index == AVAHI_IF_UNSPEC){
583
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
584
632
" without a network interface\n");
585
return -1;
633
errno = EINVAL;
634
goto mandos_end;
586
635
}
587
636
/* Set the network interface number as scope */
588
637
to.in6.sin6_scope_id = (uint32_t)if_index;
593
642
-Wunreachable-code */
594
643
}
595
644
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
596
650
if(debug){
597
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
598
652
char interface[IF_NAMESIZE];
625
679
}
626
680
}
627
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
628
687
if(af == AF_INET6){
629
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
630
689
} else {
631
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
632
691
}
633
692
if(ret < 0){
634
perror("connect");
635
return -1;
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;
636
704
}
637
705
638
706
const char *out = mandos_protocol_version;
642
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
643
711
out_size - written));
644
712
if(ret == -1){
713
int e = errno;
645
714
perror("write");
646
retval = -1;
715
errno = e;
647
716
goto mandos_end;
648
717
}
649
718
written += (size_t)ret;
657
726
break;
658
727
}
659
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
660
734
}
661
735
662
736
if(debug){
663
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
664
738
}
665
739
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
666
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
667
746
668
do{
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
669
753
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
670
758
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
671
759
672
760
if(ret != GNUTLS_E_SUCCESS){
674
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
675
763
gnutls_perror(ret);
676
764
}
677
retval = -1;
765
errno = EPROTO;
678
766
goto mandos_end;
679
767
}
680
768
686
774
}
687
775
688
776
while(true){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
689
783
buffer_capacity = incbuffer(&buffer, buffer_length,
690
784
buffer_capacity);
691
785
if(buffer_capacity == 0){
786
int e = errno;
692
787
perror("incbuffer");
693
retval = -1;
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
694
794
goto mandos_end;
695
795
}
696
796
705
805
case GNUTLS_E_AGAIN:
706
806
break;
707
807
case GNUTLS_E_REHANDSHAKE:
708
do{
808
do {
709
809
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
710
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
711
816
if(ret < 0){
712
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
713
818
gnutls_perror(ret);
714
retval = -1;
819
errno = EPROTO;
715
820
goto mandos_end;
716
821
}
717
822
break;
718
823
default:
719
824
fprintf(stderr, "Unknown error while reading data from"
720
825
" encrypted session with Mandos server\n");
721
retval = -1;
722
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
723
828
goto mandos_end;
724
829
}
725
830
} else {
731
836
fprintf(stderr, "Closing TLS session\n");
732
837
}
733
838
734
gnutls_bye(session, GNUTLS_SHUT_RDWR);
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);
735
851
736
852
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
737
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
738
855
buffer_length,
739
856
&decrypted_buffer);
740
857
if(decrypted_buffer_size >= 0){
858
741
859
written = 0;
742
860
while(written < (size_t) decrypted_buffer_size){
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
743
866
ret = (int)fwrite(decrypted_buffer + written, 1,
744
867
(size_t)decrypted_buffer_size - written,
745
868
stdout);
746
869
if(ret == 0 and ferror(stdout)){
870
int e = errno;
747
871
if(debug){
748
872
fprintf(stderr, "Error writing encrypted data: %s\n",
749
873
strerror(errno));
750
874
}
751
retval = -1;
752
break;
875
errno = e;
876
goto mandos_end;
753
877
}
754
878
written += (size_t)ret;
755
879
}
756
free(decrypted_buffer);
757
} else {
758
retval = -1;
880
retval = 0;
759
881
}
760
} else {
761
retval = -1;
762
882
}
763
883
764
884
/* Shutdown procedure */
765
885
766
886
mandos_end:
767
free(buffer);
768
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
769
if(ret == -1){
770
perror("close");
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;
771
906
}
772
gnutls_deinit(session);
773
907
return retval;
774
908
}
775
909
786
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
787
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
788
922
flags,
789
__attribute__((unused)) void* userdata){
923
AVAHI_GCC_UNUSED void* userdata){
790
924
assert(r);
791
925
792
926
/* Called whenever a service has been resolved successfully or
793
927
timed out */
794
928
929
if(quit_now){
930
return;
931
}
932
795
933
switch(event){
796
934
default:
797
935
case AVAHI_RESOLVER_FAILURE:
828
966
const char *domain,
829
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
968
flags,
831
__attribute__((unused)) void* userdata){
969
AVAHI_GCC_UNUSED void* userdata){
832
970
assert(b);
833
971
834
972
/* Called whenever a new services becomes available on the LAN or
835
973
is removed from the LAN */
836
974
975
if(quit_now){
976
return;
977
}
978
837
979
switch(event){
838
980
default:
839
981
case AVAHI_BROWSER_FAILURE:
849
991
the callback function is called the Avahi server will free the
850
992
resolver for us. */
851
993
852
if(!(avahi_s_service_resolver_new(mc.server, interface,
853
protocol, name, type, domain,
854
AVAHI_PROTO_INET6, 0,
855
resolve_callback, NULL)))
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
856
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
857
998
name, avahi_strerror(avahi_server_errno(mc.server)));
858
999
break;
869
1010
}
870
1011
}
871
1012
872
static void handle_sigterm(__attribute__((unused)) int sig){
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;
873
1020
int old_errno = errno;
874
avahi_simple_poll_quit(mc.simple_poll);
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
875
1024
errno = old_errno;
876
1025
}
877
1026
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
878
1122
int main(int argc, char *argv[]){
879
1123
AvahiSServiceBrowser *sb = NULL;
880
1124
int error;
881
1125
int ret;
882
1126
intmax_t tmpmax;
883
int numchars;
1127
char *tmp;
884
1128
int exitcode = EXIT_SUCCESS;
885
const char *interface = "eth0";
1129
const char *interface = "";
886
1130
struct ifreq network;
887
int sd;
1131
int sd = -1;
1132
bool take_down_interface = false;
888
1133
uid_t uid;
889
1134
gid_t gid;
890
char *connect_to = NULL;
891
1135
char tempdir[] = "/tmp/mandosXXXXXX";
892
1136
bool tempdir_created = false;
893
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
896
1140
897
1141
bool gnutls_initialized = false;
898
1142
bool gpgme_initialized = false;
899
double delay = 2.5;
900
901
struct sigaction old_sigterm_action;
1143
float delay = 2.5f;
1144
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
902
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
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" };
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
}
908
1168
909
1169
{
910
1170
struct argp_option options[] = {
940
1200
.arg = "SECONDS",
941
1201
.doc = "Maximum delay to wait for interface startup",
942
1202
.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 },
943
1212
{ .name = NULL }
944
1213
};
945
1214
946
1215
error_t parse_opt(int key, char *arg,
947
1216
struct argp_state *state){
1217
errno = 0;
948
1218
switch(key){
949
1219
case 128: /* --debug */
950
1220
debug = true;
962
1232
pubkey = arg;
963
1233
break;
964
1234
case 129: /* --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);
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");
970
1240
}
971
1241
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
972
1242
break;
974
1244
mc.priority = arg;
975
1245
break;
976
1246
case 131: /* --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);
1247
errno = 0;
1248
delay = strtof(arg, &tmp);
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
argp_error(state, "Bad delay");
981
1251
}
982
1252
break;
983
case ARGP_KEY_ARG:
984
argp_usage(state);
985
case ARGP_KEY_END:
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);
986
1266
break;
987
1267
default:
988
1268
return ARGP_ERR_UNKNOWN;
989
1269
}
990
return 0;
1270
return errno;
991
1271
}
992
1272
993
1273
struct argp argp = { .options = options, .parser = parse_opt,
994
1274
.args_doc = "",
995
1275
.doc = "Mandos client -- Get and decrypt"
996
1276
" passwords from a Mandos server" };
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");
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");
1000
1318
exitcode = EXIT_FAILURE;
1001
1319
goto end;
1002
1320
}
1003
1321
}
1004
1322
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
1005
1397
/* If the interface is down, bring it up */
1006
if(interface[0] != '\0'){
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
1007
1417
#ifdef __linux__
1008
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1009
messages to mess up the prompt */
1419
messages about the network interface to mess up the prompt */
1010
1420
ret = klogctl(8, NULL, 5);
1011
1421
bool restore_loglevel = true;
1012
1422
if(ret == -1){
1013
1423
restore_loglevel = false;
1014
1424
perror("klogctl");
1015
1425
}
1016
#endif
1426
#endif /* __linux__ */
1017
1427
1018
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1019
1429
if(sd < 0){
1020
1430
perror("socket");
1021
exitcode = EXIT_FAILURE;
1431
exitcode = EX_OSERR;
1022
1432
#ifdef __linux__
1023
1433
if(restore_loglevel){
1024
1434
ret = klogctl(7, NULL, 0);
1026
1436
perror("klogctl");
1027
1437
}
1028
1438
}
1029
#endif
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1030
1446
goto end;
1031
1447
}
1032
1448
strcpy(network.ifr_name, interface);
1040
1456
perror("klogctl");
1041
1457
}
1042
1458
}
1043
#endif
1044
exitcode = EXIT_FAILURE;
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
}
1045
1467
goto end;
1046
1468
}
1047
1469
if((network.ifr_flags & IFF_UP) == 0){
1048
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1049
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1050
1473
if(ret == -1){
1051
perror("ioctl SIOCSIFFLAGS");
1052
exitcode = EXIT_FAILURE;
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1053
1477
#ifdef __linux__
1054
1478
if(restore_loglevel){
1055
1479
ret = klogctl(7, NULL, 0);
1057
1481
perror("klogctl");
1058
1482
}
1059
1483
}
1060
#endif
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1061
1491
goto end;
1062
1492
}
1063
1493
}
1075
1505
perror("nanosleep");
1076
1506
}
1077
1507
}
1078
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1079
if(ret == -1){
1080
perror("close");
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
}
1081
1514
}
1082
1515
#ifdef __linux__
1083
1516
if(restore_loglevel){
1087
1520
perror("klogctl");
1088
1521
}
1089
1522
}
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");
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;
1105
1543
}
1106
1544
1107
1545
ret = init_gnutls_global(pubkey, seckey);
1108
1546
if(ret == -1){
1109
1547
fprintf(stderr, "init_gnutls_global failed\n");
1110
exitcode = EXIT_FAILURE;
1548
exitcode = EX_UNAVAILABLE;
1111
1549
goto end;
1112
1550
} else {
1113
1551
gnutls_initialized = true;
1114
1552
}
1115
1553
1554
if(quit_now){
1555
goto end;
1556
}
1557
1558
tempdir_created = true;
1116
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1117
1561
perror("mkdtemp");
1118
1562
goto end;
1119
1563
}
1120
tempdir_created = true;
1564
1565
if(quit_now){
1566
goto end;
1567
}
1121
1568
1122
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1123
1570
fprintf(stderr, "init_gpgme failed\n");
1124
exitcode = EXIT_FAILURE;
1571
exitcode = EX_UNAVAILABLE;
1125
1572
goto end;
1126
1573
} else {
1127
1574
gpgme_initialized = true;
1128
1575
}
1129
1576
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
}
1577
if(quit_now){
1578
goto end;
1137
1579
}
1138
1580
1139
1581
if(connect_to != NULL){
1142
1584
char *address = strrchr(connect_to, ':');
1143
1585
if(address == NULL){
1144
1586
fprintf(stderr, "No colon in address\n");
1145
exitcode = EXIT_FAILURE;
1146
goto end;
1147
}
1587
exitcode = EX_USAGE;
1588
goto end;
1589
}
1590
1591
if(quit_now){
1592
goto end;
1593
}
1594
1148
1595
uint16_t port;
1149
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1150
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1151
or address[numchars+1] != '\0'){
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){
1152
1600
fprintf(stderr, "Bad port number\n");
1153
exitcode = EXIT_FAILURE;
1154
goto end;
1155
}
1601
exitcode = EX_USAGE;
1602
goto end;
1603
}
1604
1605
if(quit_now){
1606
goto end;
1607
}
1608
1156
1609
port = (uint16_t)tmpmax;
1157
1610
*address = '\0';
1158
1611
address = connect_to;
1163
1616
} else {
1164
1617
af = AF_INET;
1165
1618
}
1166
ret = start_mandos_communication(address, port, if_index,
1167
af);
1168
if(ret < 0){
1169
exitcode = EXIT_FAILURE;
1170
} else {
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){
1171
1633
exitcode = EXIT_SUCCESS;
1172
1634
}
1635
1173
1636
goto end;
1174
1637
}
1175
1638
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;
1639
if(quit_now){
1188
1640
goto end;
1189
1641
}
1190
1642
1210
1662
if(mc.server == NULL){
1211
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1212
1664
avahi_strerror(error));
1213
exitcode = EXIT_FAILURE;
1665
exitcode = EX_UNAVAILABLE;
1666
goto end;
1667
}
1668
1669
if(quit_now){
1214
1670
goto end;
1215
1671
}
1216
1672
1217
1673
/* Create the Avahi service browser */
1218
1674
sb = avahi_s_service_browser_new(mc.server, if_index,
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1220
1676
NULL, 0, browse_callback, NULL);
1221
1677
if(sb == NULL){
1222
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1223
1679
avahi_strerror(avahi_server_errno(mc.server)));
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
}
1680
exitcode = EX_UNAVAILABLE;
1681
goto end;
1682
}
1683
1684
if(quit_now){
1685
goto end;
1686
}
1241
1687
1242
1688
/* Run the main loop */
1243
1689
1273
1719
gpgme_release(mc.ctx);
1274
1720
}
1275
1721
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
1276
1754
/* Removes the temp directory used by GPGME */
1277
1755
if(tempdir_created){
1278
1756
DIR *d;
1317
1795
}
1318
1796
}
1319
1797
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
1320
1817
return exitcode;
1321
1818
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0