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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 309.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- files modified:
- INSTALL
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
62
#include <time.h> /* nanosleep(), time() */
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
144
135
.dh_bits = 1024, .priority = "SECURE256"
145
136
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
137
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
150
138
/*
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
153
* "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.
154
142
*/
155
143
size_t incbuffer(char **buffer, size_t buffer_length,
156
144
size_t buffer_capacity){
169
157
*/
170
158
static bool init_gpgme(const char *seckey,
171
159
const char *pubkey, const char *tempdir){
160
int ret;
172
161
gpgme_error_t rc;
173
162
gpgme_engine_info_t engine_info;
174
163
177
166
* Helper function to insert pub and seckey to the engine keyring.
178
167
*/
179
168
bool import_key(const char *filename){
180
int ret;
181
169
int fd;
182
170
gpgme_data_t pgp_data;
183
171
210
198
}
211
199
212
200
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
201
fprintf(stderr, "Initialize gpgme\n");
214
202
}
215
203
216
204
/* Init GPGME */
254
242
return false;
255
243
}
256
244
257
return true;
245
return true;
258
246
}
259
247
260
248
/*
314
302
}
315
303
gpgme_recipient_t recipient;
316
304
recipient = result->recipients;
317
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
324
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
}
325
315
}
326
316
}
327
317
}
479
469
static int init_gnutls_session(gnutls_session_t *session){
480
470
int ret;
481
471
/* GnuTLS session creation */
482
do {
483
ret = gnutls_init(session, GNUTLS_SERVER);
484
if(quit_now){
485
return -1;
486
}
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
472
ret = gnutls_init(session, GNUTLS_SERVER);
488
473
if(ret != GNUTLS_E_SUCCESS){
489
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
475
safer_gnutls_strerror(ret));
492
477
493
478
{
494
479
const char *err;
495
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
if(quit_now){
498
gnutls_deinit(*session);
499
return -1;
500
}
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
502
481
if(ret != GNUTLS_E_SUCCESS){
503
482
fprintf(stderr, "Syntax error at: %s\n", err);
504
483
fprintf(stderr, "GnuTLS error: %s\n",
508
487
}
509
488
}
510
489
511
do {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
514
if(quit_now){
515
gnutls_deinit(*session);
516
return -1;
517
}
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
491
mc.cred);
519
492
if(ret != GNUTLS_E_SUCCESS){
520
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
494
safer_gnutls_strerror(ret));
524
497
}
525
498
526
499
/* ignore client certificate if any. */
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
528
502
529
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
530
504
539
513
static int start_mandos_communication(const char *ip, uint16_t port,
540
514
AvahiIfIndex if_index,
541
515
int af){
542
int ret, tcp_sd = -1;
516
int ret, tcp_sd;
543
517
ssize_t sret;
544
518
union {
545
519
struct sockaddr_in in;
546
520
struct sockaddr_in6 in6;
547
521
} to;
548
522
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
523
char *decrypted_buffer;
550
524
size_t buffer_length = 0;
551
525
size_t buffer_capacity = 0;
526
ssize_t decrypted_buffer_size;
552
527
size_t written;
553
int retval = -1;
528
int retval = 0;
554
529
gnutls_session_t session;
555
530
int pf; /* Protocol family */
556
531
557
errno = 0;
558
559
if(quit_now){
560
errno = EINTR;
561
return -1;
562
}
563
564
532
switch(af){
565
533
case AF_INET6:
566
534
pf = PF_INET6;
570
538
break;
571
539
default:
572
540
fprintf(stderr, "Bad address family: %d\n", af);
573
errno = EINVAL;
574
541
return -1;
575
542
}
576
543
586
553
587
554
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
555
if(tcp_sd < 0){
589
int e = errno;
590
556
perror("socket");
591
errno = e;
592
goto mandos_end;
593
}
594
595
if(quit_now){
596
errno = EINTR;
597
goto mandos_end;
557
return -1;
598
558
}
599
559
600
560
memset(&to, 0, sizeof(to));
601
561
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
562
to.in6.sin6_family = (uint16_t)af;
603
563
ret = inet_pton(af, ip, &to.in6.sin6_addr);
604
564
} else { /* IPv4 */
605
565
to.in.sin_family = (sa_family_t)af;
606
566
ret = inet_pton(af, ip, &to.in.sin_addr);
607
567
}
608
568
if(ret < 0 ){
609
int e = errno;
610
569
perror("inet_pton");
611
errno = e;
612
goto mandos_end;
570
return -1;
613
571
}
614
572
if(ret == 0){
615
int e = errno;
616
573
fprintf(stderr, "Bad address: %s\n", ip);
617
errno = e;
618
goto mandos_end;
574
return -1;
619
575
}
620
576
if(af == AF_INET6){
621
577
to.in6.sin6_port = htons(port); /* Spurious warnings from
628
584
if(if_index == AVAHI_IF_UNSPEC){
629
585
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
586
" without a network interface\n");
631
errno = EINVAL;
632
goto mandos_end;
587
return -1;
633
588
}
634
589
/* Set the network interface number as scope */
635
590
to.in6.sin6_scope_id = (uint32_t)if_index;
640
595
-Wunreachable-code */
641
596
}
642
597
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
647
648
598
if(debug){
649
599
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
600
char interface[IF_NAMESIZE];
677
627
}
678
628
}
679
629
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
630
if(af == AF_INET6){
686
631
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
632
} else {
688
633
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
634
}
690
635
if(ret < 0){
691
int e = errno;
692
636
perror("connect");
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
637
return -1;
700
638
}
701
639
702
640
const char *out = mandos_protocol_version;
706
644
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
645
out_size - written));
708
646
if(ret == -1){
709
int e = errno;
710
647
perror("write");
711
errno = e;
648
retval = -1;
712
649
goto mandos_end;
713
650
}
714
651
written += (size_t)ret;
722
659
break;
723
660
}
724
661
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
730
662
}
731
663
732
664
if(debug){
733
665
fprintf(stderr, "Establishing TLS session with %s\n", ip);
734
666
}
735
667
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
741
668
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
742
669
743
if(quit_now){
744
errno = EINTR;
745
goto mandos_end;
746
}
747
748
do {
670
do{
749
671
ret = gnutls_handshake(session);
750
if(quit_now){
751
errno = EINTR;
752
goto mandos_end;
753
}
754
672
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
755
673
756
674
if(ret != GNUTLS_E_SUCCESS){
758
676
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
759
677
gnutls_perror(ret);
760
678
}
761
errno = EPROTO;
679
retval = -1;
762
680
goto mandos_end;
763
681
}
764
682
770
688
}
771
689
772
690
while(true){
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
779
691
buffer_capacity = incbuffer(&buffer, buffer_length,
780
692
buffer_capacity);
781
693
if(buffer_capacity == 0){
782
int e = errno;
783
694
perror("incbuffer");
784
errno = e;
785
goto mandos_end;
786
}
787
788
if(quit_now){
789
errno = EINTR;
695
retval = -1;
790
696
goto mandos_end;
791
697
}
792
698
801
707
case GNUTLS_E_AGAIN:
802
708
break;
803
709
case GNUTLS_E_REHANDSHAKE:
804
do {
710
do{
805
711
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
712
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
713
if(ret < 0){
813
714
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
814
715
gnutls_perror(ret);
815
errno = EPROTO;
716
retval = -1;
816
717
goto mandos_end;
817
718
}
818
719
break;
819
720
default:
820
721
fprintf(stderr, "Unknown error while reading data from"
821
722
" encrypted session with Mandos server\n");
723
retval = -1;
822
724
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
824
725
goto mandos_end;
825
726
}
826
727
} else {
832
733
fprintf(stderr, "Closing TLS session\n");
833
734
}
834
735
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
do {
841
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
847
737
848
738
if(buffer_length > 0){
849
ssize_t decrypted_buffer_size;
850
739
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
740
buffer_length,
852
741
&decrypted_buffer);
853
742
if(decrypted_buffer_size >= 0){
854
855
743
written = 0;
856
744
while(written < (size_t) decrypted_buffer_size){
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
862
745
ret = (int)fwrite(decrypted_buffer + written, 1,
863
746
(size_t)decrypted_buffer_size - written,
864
747
stdout);
865
748
if(ret == 0 and ferror(stdout)){
866
int e = errno;
867
749
if(debug){
868
750
fprintf(stderr, "Error writing encrypted data: %s\n",
869
751
strerror(errno));
870
752
}
871
errno = e;
872
goto mandos_end;
753
retval = -1;
754
break;
873
755
}
874
756
written += (size_t)ret;
875
757
}
876
retval = 0;
758
free(decrypted_buffer);
759
} else {
760
retval = -1;
877
761
}
762
} else {
763
retval = -1;
878
764
}
879
765
880
766
/* Shutdown procedure */
881
767
882
768
mandos_end:
883
{
884
int e = errno;
885
free(decrypted_buffer);
886
free(buffer);
887
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
889
}
890
if(ret == -1){
891
if(e == 0){
892
e = errno;
893
}
894
perror("close");
895
}
896
gnutls_deinit(session);
897
if(quit_now){
898
e = EINTR;
899
retval = -1;
900
}
901
errno = e;
769
free(buffer);
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
771
if(ret == -1){
772
perror("close");
902
773
}
774
gnutls_deinit(session);
903
775
return retval;
904
776
}
905
777
916
788
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
789
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
790
flags,
919
AVAHI_GCC_UNUSED void* userdata){
791
__attribute__((unused)) void* userdata){
920
792
assert(r);
921
793
922
794
/* Called whenever a service has been resolved successfully or
923
795
timed out */
924
796
925
if(quit_now){
926
return;
927
}
928
929
797
switch(event){
930
798
default:
931
799
case AVAHI_RESOLVER_FAILURE:
962
830
const char *domain,
963
831
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
832
flags,
965
AVAHI_GCC_UNUSED void* userdata){
833
__attribute__((unused)) void* userdata){
966
834
assert(b);
967
835
968
836
/* Called whenever a new services becomes available on the LAN or
969
837
is removed from the LAN */
970
838
971
if(quit_now){
972
return;
973
}
974
975
839
switch(event){
976
840
default:
977
841
case AVAHI_BROWSER_FAILURE:
987
851
the callback function is called the Avahi server will free the
988
852
resolver for us. */
989
853
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
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)))
993
858
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
859
name, avahi_strerror(avahi_server_errno(mc.server)));
995
860
break;
1007
872
}
1008
873
1009
874
/* stop main loop after sigterm has been called */
1010
static void handle_sigterm(int sig){
1011
if(quit_now){
1012
return;
1013
}
1014
quit_now = 1;
1015
signal_received = sig;
875
static void handle_sigterm(__attribute__((unused)) int sig){
1016
876
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
877
avahi_simple_poll_quit(mc.simple_poll);
1020
878
errno = old_errno;
1021
879
}
1022
880
1025
883
int error;
1026
884
int ret;
1027
885
intmax_t tmpmax;
1028
char *tmp;
886
int numchars;
1029
887
int exitcode = EXIT_SUCCESS;
1030
888
const char *interface = "eth0";
1031
889
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
890
int sd;
1034
891
uid_t uid;
1035
892
gid_t gid;
1036
893
char *connect_to = NULL;
1042
899
1043
900
bool gnutls_initialized = false;
1044
901
bool gpgme_initialized = false;
1045
float delay = 2.5f;
1046
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
902
double delay = 2.5;
903
904
struct sigaction old_sigterm_action;
1048
905
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1049
1050
uid = getuid();
1051
gid = getgid();
1052
1053
/* Lower any group privileges we might have, just to be safe */
1054
errno = 0;
1055
ret = setgid(gid);
1056
if(ret == -1){
1057
perror("setgid");
1058
}
1059
1060
/* Lower user privileges (temporarily) */
1061
errno = 0;
1062
ret = seteuid(uid);
1063
if(ret == -1){
1064
perror("seteuid");
1065
}
1066
1067
if(quit_now){
1068
goto end;
1069
}
1070
906
1071
907
{
1072
908
struct argp_option options[] = {
1073
909
{ .name = "debug", .key = 128,
1102
938
.arg = "SECONDS",
1103
939
.doc = "Maximum delay to wait for interface startup",
1104
940
.group = 2 },
1105
/*
1106
* These reproduce what we would get without ARGP_NO_HELP
1107
*/
1108
{ .name = "help", .key = '?',
1109
.doc = "Give this help list", .group = -1 },
1110
{ .name = "usage", .key = -3,
1111
.doc = "Give a short usage message", .group = -1 },
1112
{ .name = "version", .key = 'V',
1113
.doc = "Print program version", .group = -1 },
1114
941
{ .name = NULL }
1115
942
};
1116
943
1117
944
error_t parse_opt(int key, char *arg,
1118
945
struct argp_state *state){
1119
errno = 0;
1120
946
switch(key){
1121
947
case 128: /* --debug */
1122
948
debug = true;
1134
960
pubkey = arg;
1135
961
break;
1136
962
case 129: /* --dh-bits */
1137
errno = 0;
1138
tmpmax = strtoimax(arg, &tmp, 10);
1139
if(errno != 0 or tmp == arg or *tmp != '\0'
1140
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1141
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);
1142
968
}
1143
969
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
970
break;
1146
972
mc.priority = arg;
1147
973
break;
1148
974
case 131: /* --delay */
1149
errno = 0;
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
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);
1153
979
}
1154
980
break;
1155
/*
1156
* These reproduce what we would get without ARGP_NO_HELP
1157
*/
1158
case '?': /* --help */
1159
argp_state_help(state, state->out_stream,
1160
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1161
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1162
case -3: /* --usage */
1163
argp_state_help(state, state->out_stream,
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
exit(argp_err_exit_status);
981
case ARGP_KEY_ARG:
982
argp_usage(state);
983
case ARGP_KEY_END:
1168
984
break;
1169
985
default:
1170
986
return ARGP_ERR_UNKNOWN;
1171
987
}
1172
return errno;
988
return 0;
1173
989
}
1174
990
1175
991
struct argp argp = { .options = options, .parser = parse_opt,
1176
992
.args_doc = "",
1177
993
.doc = "Mandos client -- Get and decrypt"
1178
994
" passwords from a Mandos server" };
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
1182
case 0:
1183
break;
1184
case ENOMEM:
1185
default:
1186
errno = ret;
1187
perror("argp_parse");
1188
exitcode = EX_OSERR;
1189
goto end;
1190
case EINVAL:
1191
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;
1192
999
goto end;
1193
1000
}
1194
1001
}
1195
1002
1196
1003
if(not debug){
1197
1004
avahi_set_log_function(empty_log);
1198
1005
}
1199
1006
1200
1007
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1008
from the signal handler */
1202
1009
/* Initialize the pseudo-RNG for Avahi */
1204
1011
mc.simple_poll = avahi_simple_poll_new();
1205
1012
if(mc.simple_poll == NULL){
1206
1013
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1207
exitcode = EX_UNAVAILABLE;
1014
exitcode = EXIT_FAILURE;
1208
1015
goto end;
1209
1016
}
1210
1017
1211
1018
sigemptyset(&sigterm_action.sa_mask);
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
if(ret == -1){
1214
perror("sigaddset");
1215
exitcode = EX_OSERR;
1216
goto end;
1217
}
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
if(ret == -1){
1220
perror("sigaddset");
1221
exitcode = EX_OSERR;
1222
goto end;
1223
}
1224
1019
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
1020
if(ret == -1){
1226
1021
perror("sigaddset");
1227
exitcode = EX_OSERR;
1228
goto end;
1229
}
1230
/* Need to check if the handler is SIG_IGN before handling:
1231
| [[info:libc:Initial Signal Actions]] |
1232
| [[info:libc:Basic Signal Handling]] |
1233
*/
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
if(ret == -1){
1236
perror("sigaction");
1237
return EX_OSERR;
1238
}
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
if(ret == -1){
1242
perror("sigaction");
1243
exitcode = EX_OSERR;
1244
goto end;
1245
}
1246
}
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
if(ret == -1){
1249
perror("sigaction");
1250
return EX_OSERR;
1251
}
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
if(ret == -1){
1255
perror("sigaction");
1256
exitcode = EX_OSERR;
1257
goto end;
1258
}
1259
}
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
if(ret == -1){
1262
perror("sigaction");
1263
return EX_OSERR;
1264
}
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
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
1273
1032
1274
1033
/* If the interface is down, bring it up */
1275
1034
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
1035
#ifdef __linux__
1295
1036
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1037
messages to mess up the prompt */
1297
1038
ret = klogctl(8, NULL, 5);
1298
1039
bool restore_loglevel = true;
1299
1040
if(ret == -1){
1300
1041
restore_loglevel = false;
1301
1042
perror("klogctl");
1302
1043
}
1303
#endif /* __linux__ */
1044
#endif
1304
1045
1305
1046
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
1047
if(sd < 0){
1307
1048
perror("socket");
1308
exitcode = EX_OSERR;
1049
exitcode = EXIT_FAILURE;
1309
1050
#ifdef __linux__
1310
1051
if(restore_loglevel){
1311
1052
ret = klogctl(7, NULL, 0);
1313
1054
perror("klogctl");
1314
1055
}
1315
1056
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1057
#endif
1323
1058
goto end;
1324
1059
}
1325
1060
strcpy(network.ifr_name, interface);
1333
1068
perror("klogctl");
1334
1069
}
1335
1070
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1071
#endif
1072
exitcode = EXIT_FAILURE;
1344
1073
goto end;
1345
1074
}
1346
1075
if((network.ifr_flags & IFF_UP) == 0){
1347
1076
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
1077
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
1078
if(ret == -1){
1351
take_down_interface = false;
1352
1079
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1080
exitcode = EXIT_FAILURE;
1354
1081
#ifdef __linux__
1355
1082
if(restore_loglevel){
1356
1083
ret = klogctl(7, NULL, 0);
1358
1085
perror("klogctl");
1359
1086
}
1360
1087
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1088
#endif
1368
1089
goto end;
1369
1090
}
1370
1091
}
1382
1103
perror("nanosleep");
1383
1104
}
1384
1105
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1106
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1107
if(ret == -1){
1108
perror("close");
1391
1109
}
1392
1110
#ifdef __linux__
1393
1111
if(restore_loglevel){
1397
1115
perror("klogctl");
1398
1116
}
1399
1117
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
1416
}
1417
1418
if(quit_now){
1419
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");
1420
1133
}
1421
1134
1422
1135
ret = init_gnutls_global(pubkey, seckey);
1423
1136
if(ret == -1){
1424
1137
fprintf(stderr, "init_gnutls_global failed\n");
1425
exitcode = EX_UNAVAILABLE;
1138
exitcode = EXIT_FAILURE;
1426
1139
goto end;
1427
1140
} else {
1428
1141
gnutls_initialized = true;
1429
1142
}
1430
1143
1431
if(quit_now){
1432
goto end;
1433
}
1434
1435
tempdir_created = true;
1436
1144
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
1145
perror("mkdtemp");
1439
1146
goto end;
1440
1147
}
1441
1442
if(quit_now){
1443
goto end;
1444
}
1148
tempdir_created = true;
1445
1149
1446
1150
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
1151
fprintf(stderr, "init_gpgme failed\n");
1448
exitcode = EX_UNAVAILABLE;
1152
exitcode = EXIT_FAILURE;
1449
1153
goto end;
1450
1154
} else {
1451
1155
gpgme_initialized = true;
1452
1156
}
1453
1157
1454
if(quit_now){
1455
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
}
1456
1165
}
1457
1166
1458
1167
if(connect_to != NULL){
1461
1170
char *address = strrchr(connect_to, ':');
1462
1171
if(address == NULL){
1463
1172
fprintf(stderr, "No colon in address\n");
1464
exitcode = EX_USAGE;
1465
goto end;
1466
}
1467
1468
if(quit_now){
1469
goto end;
1470
}
1471
1173
exitcode = EXIT_FAILURE;
1174
goto end;
1175
}
1472
1176
uint16_t port;
1473
errno = 0;
1474
tmpmax = strtoimax(address+1, &tmp, 10);
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
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'){
1477
1180
fprintf(stderr, "Bad port number\n");
1478
exitcode = EX_USAGE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
}
1486
1184
port = (uint16_t)tmpmax;
1487
1185
*address = '\0';
1488
1186
address = connect_to;
1493
1191
} else {
1494
1192
af = AF_INET;
1495
1193
}
1496
1497
if(quit_now){
1498
goto end;
1499
}
1500
1501
ret = start_mandos_communication(address, port, if_index, af);
1194
ret = start_mandos_communication(address, port, if_index,
1195
af);
1502
1196
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1197
exitcode = EXIT_FAILURE;
1522
1198
} else {
1523
1199
exitcode = EXIT_SUCCESS;
1524
1200
}
1525
1201
goto end;
1526
1202
}
1527
1528
if(quit_now){
1529
goto end;
1530
}
1531
1203
1532
1204
{
1533
1205
AvahiServerConfig config;
1534
1206
/* Do not publish any local Zeroconf records */
1551
1223
if(mc.server == NULL){
1552
1224
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
1225
avahi_strerror(error));
1554
exitcode = EX_UNAVAILABLE;
1555
goto end;
1556
}
1557
1558
if(quit_now){
1226
exitcode = EXIT_FAILURE;
1559
1227
goto end;
1560
1228
}
1561
1229
1562
1230
/* Create the Avahi service browser */
1563
1231
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1232
AVAHI_PROTO_INET6, "_mandos._tcp",
1565
1233
NULL, 0, browse_callback, NULL);
1566
1234
if(sb == NULL){
1567
1235
fprintf(stderr, "Failed to create service browser: %s\n",
1568
1236
avahi_strerror(avahi_server_errno(mc.server)));
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
}
1572
1573
if(quit_now){
1237
exitcode = EXIT_FAILURE;
1574
1238
goto end;
1575
1239
}
1576
1240
1608
1272
gpgme_release(mc.ctx);
1609
1273
}
1610
1274
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
1275
/* Removes the temp directory used by GPGME */
1644
1276
if(tempdir_created){
1645
1277
DIR *d;
1684
1316
}
1685
1317
}
1686
1318
1687
if(quit_now){
1688
sigemptyset(&old_sigterm_action.sa_mask);
1689
old_sigterm_action.sa_handler = SIG_DFL;
1690
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1691
&old_sigterm_action,
1692
NULL));
1693
if(ret == -1){
1694
perror("sigaction");
1695
}
1696
do {
1697
ret = raise(signal_received);
1698
} while(ret != 0 and errno == EINTR);
1699
if(ret != 0){
1700
perror("raise");
1701
abort();
1702
}
1703
TEMP_FAILURE_RETRY(pause());
1704
}
1705
1706
1319
return exitcode;
1707
1320
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0