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» Revision
24.1.135
(compared to revision 237.2.199)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 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-20090209181518-powtql91qv3wu51d
Earlier signal handling
added
removed
plugins.d/mandos-client.c
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 {
146
135
.dh_bits = 1024, .priority = "SECURE256"
147
136
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
137
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
152
138
/*
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.
139
* Make additional room in "buffer" for at least BUFFER_SIZE
140
* additional bytes. "buffer_capacity" is how much is currently
141
* allocated, "buffer_length" is how much is already used.
156
142
*/
157
143
size_t incbuffer(char **buffer, size_t buffer_length,
158
144
size_t buffer_capacity){
171
157
*/
172
158
static bool init_gpgme(const char *seckey,
173
159
const char *pubkey, const char *tempdir){
160
int ret;
174
161
gpgme_error_t rc;
175
162
gpgme_engine_info_t engine_info;
176
163
179
166
* Helper function to insert pub and seckey to the engine keyring.
180
167
*/
181
168
bool import_key(const char *filename){
182
int ret;
183
169
int fd;
184
170
gpgme_data_t pgp_data;
185
171
212
198
}
213
199
214
200
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
201
fprintf(stderr, "Initialize gpgme\n");
216
202
}
217
203
218
204
/* Init GPGME */
256
242
return false;
257
243
}
258
244
259
return true;
245
return true;
260
246
}
261
247
262
248
/*
316
302
}
317
303
gpgme_recipient_t recipient;
318
304
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;
305
if(recipient){
306
while(recipient != NULL){
307
fprintf(stderr, "Public key algorithm: %s\n",
308
gpgme_pubkey_algo_name(recipient->pubkey_algo));
309
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
310
fprintf(stderr, "Secret key available: %s\n",
311
recipient->status == GPG_ERR_NO_SECKEY
312
? "No" : "Yes");
313
recipient = recipient->next;
314
}
327
315
}
328
316
}
329
317
}
481
469
static int init_gnutls_session(gnutls_session_t *session){
482
470
int ret;
483
471
/* 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);
472
ret = gnutls_init(session, GNUTLS_SERVER);
490
473
if(ret != GNUTLS_E_SUCCESS){
491
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
475
safer_gnutls_strerror(ret));
494
477
495
478
{
496
479
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);
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
504
481
if(ret != GNUTLS_E_SUCCESS){
505
482
fprintf(stderr, "Syntax error at: %s\n", err);
506
483
fprintf(stderr, "GnuTLS error: %s\n",
510
487
}
511
488
}
512
489
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
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
491
mc.cred);
521
492
if(ret != GNUTLS_E_SUCCESS){
522
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
494
safer_gnutls_strerror(ret));
526
497
}
527
498
528
499
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
530
502
531
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
504
541
513
static int start_mandos_communication(const char *ip, uint16_t port,
542
514
AvahiIfIndex if_index,
543
515
int af){
544
int ret, tcp_sd = -1;
516
int ret, tcp_sd;
545
517
ssize_t sret;
546
518
union {
547
519
struct sockaddr_in in;
548
520
struct sockaddr_in6 in6;
549
521
} to;
550
522
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
523
char *decrypted_buffer;
552
524
size_t buffer_length = 0;
553
525
size_t buffer_capacity = 0;
526
ssize_t decrypted_buffer_size;
554
527
size_t written;
555
int retval = -1;
528
int retval = 0;
556
529
gnutls_session_t session;
557
530
int pf; /* Protocol family */
558
531
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
532
switch(af){
567
533
case AF_INET6:
568
534
pf = PF_INET6;
572
538
break;
573
539
default:
574
540
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
541
return -1;
577
542
}
578
543
588
553
589
554
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
555
if(tcp_sd < 0){
591
int e = errno;
592
556
perror("socket");
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
557
return -1;
600
558
}
601
559
602
560
memset(&to, 0, sizeof(to));
603
561
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
562
to.in6.sin6_family = (uint16_t)af;
605
563
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
564
} else { /* IPv4 */
607
565
to.in.sin_family = (sa_family_t)af;
608
566
ret = inet_pton(af, ip, &to.in.sin_addr);
609
567
}
610
568
if(ret < 0 ){
611
int e = errno;
612
569
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
570
return -1;
615
571
}
616
572
if(ret == 0){
617
int e = errno;
618
573
fprintf(stderr, "Bad address: %s\n", ip);
619
errno = e;
620
goto mandos_end;
574
return -1;
621
575
}
622
576
if(af == AF_INET6){
623
577
to.in6.sin6_port = htons(port); /* Spurious warnings from
630
584
if(if_index == AVAHI_IF_UNSPEC){
631
585
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
586
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
587
return -1;
635
588
}
636
589
/* Set the network interface number as scope */
637
590
to.in6.sin6_scope_id = (uint32_t)if_index;
642
595
-Wunreachable-code */
643
596
}
644
597
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
650
598
if(debug){
651
599
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
600
char interface[IF_NAMESIZE];
679
627
}
680
628
}
681
629
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
630
if(af == AF_INET6){
688
631
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
632
} else {
690
633
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
634
}
692
635
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;
636
perror("connect");
637
return -1;
704
638
}
705
639
706
640
const char *out = mandos_protocol_version;
710
644
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
645
out_size - written));
712
646
if(ret == -1){
713
int e = errno;
714
647
perror("write");
715
errno = e;
648
retval = -1;
716
649
goto mandos_end;
717
650
}
718
651
written += (size_t)ret;
726
659
break;
727
660
}
728
661
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
662
}
735
663
736
664
if(debug){
737
665
fprintf(stderr, "Establishing TLS session with %s\n", ip);
738
666
}
739
667
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
668
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
669
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
670
do{
753
671
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
758
672
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
759
673
760
674
if(ret != GNUTLS_E_SUCCESS){
762
676
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
677
gnutls_perror(ret);
764
678
}
765
errno = EPROTO;
679
retval = -1;
766
680
goto mandos_end;
767
681
}
768
682
774
688
}
775
689
776
690
while(true){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
691
buffer_capacity = incbuffer(&buffer, buffer_length,
784
692
buffer_capacity);
785
693
if(buffer_capacity == 0){
786
int e = errno;
787
694
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
695
retval = -1;
794
696
goto mandos_end;
795
697
}
796
698
805
707
case GNUTLS_E_AGAIN:
806
708
break;
807
709
case GNUTLS_E_REHANDSHAKE:
808
do {
710
do{
809
711
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
712
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
713
if(ret < 0){
817
714
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
715
gnutls_perror(ret);
819
errno = EPROTO;
716
retval = -1;
820
717
goto mandos_end;
821
718
}
822
719
break;
823
720
default:
824
721
fprintf(stderr, "Unknown error while reading data from"
825
722
" encrypted session with Mandos server\n");
723
retval = -1;
826
724
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
828
725
goto mandos_end;
829
726
}
830
727
} else {
836
733
fprintf(stderr, "Closing TLS session\n");
837
734
}
838
735
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);
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
851
737
852
738
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
854
739
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
740
buffer_length,
856
741
&decrypted_buffer);
857
742
if(decrypted_buffer_size >= 0){
858
859
743
written = 0;
860
744
while(written < (size_t) decrypted_buffer_size){
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
745
ret = (int)fwrite(decrypted_buffer + written, 1,
867
746
(size_t)decrypted_buffer_size - written,
868
747
stdout);
869
748
if(ret == 0 and ferror(stdout)){
870
int e = errno;
871
749
if(debug){
872
750
fprintf(stderr, "Error writing encrypted data: %s\n",
873
751
strerror(errno));
874
752
}
875
errno = e;
876
goto mandos_end;
753
retval = -1;
754
break;
877
755
}
878
756
written += (size_t)ret;
879
757
}
880
retval = 0;
758
free(decrypted_buffer);
759
} else {
760
retval = -1;
881
761
}
762
} else {
763
retval = -1;
882
764
}
883
765
884
766
/* Shutdown procedure */
885
767
886
768
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;
769
free(buffer);
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
771
if(ret == -1){
772
perror("close");
906
773
}
774
gnutls_deinit(session);
907
775
return retval;
908
776
}
909
777
920
788
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
789
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
790
flags,
923
AVAHI_GCC_UNUSED void* userdata){
791
__attribute__((unused)) void* userdata){
924
792
assert(r);
925
793
926
794
/* Called whenever a service has been resolved successfully or
927
795
timed out */
928
796
929
if(quit_now){
930
return;
931
}
932
933
797
switch(event){
934
798
default:
935
799
case AVAHI_RESOLVER_FAILURE:
966
830
const char *domain,
967
831
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
832
flags,
969
AVAHI_GCC_UNUSED void* userdata){
833
__attribute__((unused)) void* userdata){
970
834
assert(b);
971
835
972
836
/* Called whenever a new services becomes available on the LAN or
973
837
is removed from the LAN */
974
838
975
if(quit_now){
976
return;
977
}
978
979
839
switch(event){
980
840
default:
981
841
case AVAHI_BROWSER_FAILURE:
991
851
the callback function is called the Avahi server will free the
992
852
resolver for us. */
993
853
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
854
if(!(avahi_s_service_resolver_new(mc.server, interface,
855
protocol, name, type, domain,
856
AVAHI_PROTO_INET6, 0,
857
resolve_callback, NULL)))
997
858
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
859
name, avahi_strerror(avahi_server_errno(mc.server)));
999
860
break;
1011
872
}
1012
873
1013
874
/* 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;
875
static void handle_sigterm(__attribute__((unused)) int sig){
1020
876
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
877
avahi_simple_poll_quit(mc.simple_poll);
1024
878
errno = old_errno;
1025
879
}
1026
880
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
881
int main(int argc, char *argv[]){
1123
882
AvahiSServiceBrowser *sb = NULL;
1124
883
int error;
1125
884
int ret;
1126
885
intmax_t tmpmax;
1127
char *tmp;
886
int numchars;
1128
887
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
888
const char *interface = "eth0";
1130
889
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
890
int sd;
1133
891
uid_t uid;
1134
892
gid_t gid;
893
char *connect_to = NULL;
1135
894
char tempdir[] = "/tmp/mandosXXXXXX";
1136
895
bool tempdir_created = false;
1137
896
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1140
899
1141
900
bool gnutls_initialized = false;
1142
901
bool gpgme_initialized = false;
1143
float delay = 2.5f;
1144
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
902
double delay = 2.5;
903
904
struct sigaction old_sigterm_action;
1146
905
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
}
1168
906
1169
907
{
1170
908
struct argp_option options[] = {
1171
909
{ .name = "debug", .key = 128,
1200
938
.arg = "SECONDS",
1201
939
.doc = "Maximum delay to wait for interface startup",
1202
940
.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
941
{ .name = NULL }
1213
942
};
1214
943
1215
944
error_t parse_opt(int key, char *arg,
1216
945
struct argp_state *state){
1217
errno = 0;
1218
946
switch(key){
1219
947
case 128: /* --debug */
1220
948
debug = true;
1232
960
pubkey = arg;
1233
961
break;
1234
962
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");
963
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
964
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
965
or arg[numchars] != '\0'){
966
fprintf(stderr, "Bad number of DH bits\n");
967
exit(EXIT_FAILURE);
1240
968
}
1241
969
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1242
970
break;
1244
972
mc.priority = arg;
1245
973
break;
1246
974
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");
975
ret = sscanf(arg, "%lf%n", &delay, &numchars);
976
if(ret < 1 or arg[numchars] != '\0'){
977
fprintf(stderr, "Bad delay\n");
978
exit(EXIT_FAILURE);
1251
979
}
1252
980
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);
981
case ARGP_KEY_ARG:
982
argp_usage(state);
983
case ARGP_KEY_END:
1266
984
break;
1267
985
default:
1268
986
return ARGP_ERR_UNKNOWN;
1269
987
}
1270
return errno;
988
return 0;
1271
989
}
1272
990
1273
991
struct argp argp = { .options = options, .parser = parse_opt,
1274
992
.args_doc = "",
1275
993
.doc = "Mandos client -- Get and decrypt"
1276
994
" 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;
995
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
996
if(ret == ARGP_ERR_UNKNOWN){
997
fprintf(stderr, "Unknown error while parsing arguments\n");
998
exitcode = EXIT_FAILURE;
1290
999
goto end;
1291
1000
}
1292
1001
}
1293
1002
1294
1003
if(not debug){
1295
1004
avahi_set_log_function(empty_log);
1296
1005
}
1297
1006
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");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
1322
1323
1007
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
1008
from the signal handler */
1325
1009
/* Initialize the pseudo-RNG for Avahi */
1327
1011
mc.simple_poll = avahi_simple_poll_new();
1328
1012
if(mc.simple_poll == NULL){
1329
1013
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1330
exitcode = EX_UNAVAILABLE;
1014
exitcode = EXIT_FAILURE;
1331
1015
goto end;
1332
1016
}
1333
1017
1334
1018
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
1019
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
1020
if(ret == -1){
1349
1021
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
}
1022
exitcode = EXIT_FAILURE;
1023
goto end;
1024
}
1025
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1026
if(ret == -1){
1027
perror("sigaction");
1028
exitcode = EXIT_FAILURE;
1029
goto end;
1030
}
1031
1396
1032
1397
1033
/* 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
1034
if(interface[0] != '\0'){
1417
1035
#ifdef __linux__
1418
1036
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1037
messages to mess up the prompt */
1420
1038
ret = klogctl(8, NULL, 5);
1421
1039
bool restore_loglevel = true;
1422
1040
if(ret == -1){
1423
1041
restore_loglevel = false;
1424
1042
perror("klogctl");
1425
1043
}
1426
#endif /* __linux__ */
1044
#endif
1427
1045
1428
1046
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
1047
if(sd < 0){
1430
1048
perror("socket");
1431
exitcode = EX_OSERR;
1049
exitcode = EXIT_FAILURE;
1432
1050
#ifdef __linux__
1433
1051
if(restore_loglevel){
1434
1052
ret = klogctl(7, NULL, 0);
1436
1054
perror("klogctl");
1437
1055
}
1438
1056
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1057
#endif
1446
1058
goto end;
1447
1059
}
1448
1060
strcpy(network.ifr_name, interface);
1456
1068
perror("klogctl");
1457
1069
}
1458
1070
}
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
}
1071
#endif
1072
exitcode = EXIT_FAILURE;
1467
1073
goto end;
1468
1074
}
1469
1075
if((network.ifr_flags & IFF_UP) == 0){
1470
1076
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
1077
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
1078
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1079
perror("ioctl SIOCSIFFLAGS");
1080
exitcode = EXIT_FAILURE;
1477
1081
#ifdef __linux__
1478
1082
if(restore_loglevel){
1479
1083
ret = klogctl(7, NULL, 0);
1481
1085
perror("klogctl");
1482
1086
}
1483
1087
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1088
#endif
1491
1089
goto end;
1492
1090
}
1493
1091
}
1505
1103
perror("nanosleep");
1506
1104
}
1507
1105
}
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
}
1106
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1107
if(ret == -1){
1108
perror("close");
1514
1109
}
1515
1110
#ifdef __linux__
1516
1111
if(restore_loglevel){
1520
1115
perror("klogctl");
1521
1116
}
1522
1117
}
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;
1118
#endif
1119
}
1120
1121
uid = getuid();
1122
gid = getgid();
1123
1124
errno = 0;
1125
setgid(gid);
1126
if(ret == -1){
1127
perror("setgid");
1128
}
1129
1130
ret = setuid(uid);
1131
if(ret == -1){
1132
perror("setuid");
1543
1133
}
1544
1134
1545
1135
ret = init_gnutls_global(pubkey, seckey);
1546
1136
if(ret == -1){
1547
1137
fprintf(stderr, "init_gnutls_global failed\n");
1548
exitcode = EX_UNAVAILABLE;
1138
exitcode = EXIT_FAILURE;
1549
1139
goto end;
1550
1140
} else {
1551
1141
gnutls_initialized = true;
1552
1142
}
1553
1143
1554
if(quit_now){
1555
goto end;
1556
}
1557
1558
tempdir_created = true;
1559
1144
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
1145
perror("mkdtemp");
1562
1146
goto end;
1563
1147
}
1564
1565
if(quit_now){
1566
goto end;
1567
}
1148
tempdir_created = true;
1568
1149
1569
1150
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
1151
fprintf(stderr, "init_gpgme failed\n");
1571
exitcode = EX_UNAVAILABLE;
1152
exitcode = EXIT_FAILURE;
1572
1153
goto end;
1573
1154
} else {
1574
1155
gpgme_initialized = true;
1575
1156
}
1576
1157
1577
if(quit_now){
1578
goto end;
1158
if(interface[0] != '\0'){
1159
if_index = (AvahiIfIndex) if_nametoindex(interface);
1160
if(if_index == 0){
1161
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1579
1165
}
1580
1166
1581
1167
if(connect_to != NULL){
1584
1170
char *address = strrchr(connect_to, ':');
1585
1171
if(address == NULL){
1586
1172
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
1173
exitcode = EXIT_FAILURE;
1174
goto end;
1175
}
1595
1176
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){
1177
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1178
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1179
or address[numchars+1] != '\0'){
1600
1180
fprintf(stderr, "Bad port number\n");
1601
exitcode = EX_USAGE;
1602
goto end;
1603
}
1604
1605
if(quit_now){
1606
goto end;
1607
}
1608
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
}
1609
1184
port = (uint16_t)tmpmax;
1610
1185
*address = '\0';
1611
1186
address = connect_to;
1616
1191
} else {
1617
1192
af = AF_INET;
1618
1193
}
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){
1194
ret = start_mandos_communication(address, port, if_index,
1195
af);
1196
if(ret < 0){
1197
exitcode = EXIT_FAILURE;
1198
} else {
1633
1199
exitcode = EXIT_SUCCESS;
1634
1200
}
1635
1636
goto end;
1637
}
1638
1639
if(quit_now){
1640
goto end;
1641
}
1642
1201
goto end;
1202
}
1203
1643
1204
{
1644
1205
AvahiServerConfig config;
1645
1206
/* Do not publish any local Zeroconf records */
1662
1223
if(mc.server == NULL){
1663
1224
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
1225
avahi_strerror(error));
1665
exitcode = EX_UNAVAILABLE;
1666
goto end;
1667
}
1668
1669
if(quit_now){
1226
exitcode = EXIT_FAILURE;
1670
1227
goto end;
1671
1228
}
1672
1229
1673
1230
/* Create the Avahi service browser */
1674
1231
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1232
AVAHI_PROTO_INET6, "_mandos._tcp",
1676
1233
NULL, 0, browse_callback, NULL);
1677
1234
if(sb == NULL){
1678
1235
fprintf(stderr, "Failed to create service browser: %s\n",
1679
1236
avahi_strerror(avahi_server_errno(mc.server)));
1680
exitcode = EX_UNAVAILABLE;
1681
goto end;
1682
}
1683
1684
if(quit_now){
1237
exitcode = EXIT_FAILURE;
1685
1238
goto end;
1686
1239
}
1687
1240
1719
1272
gpgme_release(mc.ctx);
1720
1273
}
1721
1274
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
1275
/* Removes the temp directory used by GPGME */
1755
1276
if(tempdir_created){
1756
1277
DIR *d;
1795
1316
}
1796
1317
}
1797
1318
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
1319
return exitcode;
1818
1320
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0