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- Committer: Teddy Hogeborn
- Date: 2009-02-09 19:26:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090209192619-7rse82x9pypq4ihk
* plugin-runner.c: Comment change.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
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
80
76
argp_parse(), ARGP_KEY_ARG,
81
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
78
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
87
81
88
82
#ifdef __linux__
89
83
#include <sys/klog.h> /* klogctl() */
127
121
static const char mandos_protocol_version[] = "1";
128
122
const char *argp_program_version = "mandos-client " VERSION;
129
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
132
124
133
125
/* Used for passing in values through the Avahi callback functions */
134
126
typedef struct {
142
134
} mandos_context;
143
135
144
136
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
137
mandos_context mc;
151
138
152
139
/*
153
140
* Make additional room in "buffer" for at least BUFFER_SIZE more
171
158
*/
172
159
static bool init_gpgme(const char *seckey,
173
160
const char *pubkey, const char *tempdir){
161
int ret;
174
162
gpgme_error_t rc;
175
163
gpgme_engine_info_t engine_info;
176
164
179
167
* Helper function to insert pub and seckey to the engine keyring.
180
168
*/
181
169
bool import_key(const char *filename){
182
int ret;
183
170
int fd;
184
171
gpgme_data_t pgp_data;
185
172
256
243
return false;
257
244
}
258
245
259
return true;
246
return true;
260
247
}
261
248
262
249
/*
316
303
}
317
304
gpgme_recipient_t recipient;
318
305
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;
306
if(recipient){
307
while(recipient != NULL){
308
fprintf(stderr, "Public key algorithm: %s\n",
309
gpgme_pubkey_algo_name(recipient->pubkey_algo));
310
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
311
fprintf(stderr, "Secret key available: %s\n",
312
recipient->status == GPG_ERR_NO_SECKEY
313
? "No" : "Yes");
314
recipient = recipient->next;
315
}
327
316
}
328
317
}
329
318
}
481
470
static int init_gnutls_session(gnutls_session_t *session){
482
471
int ret;
483
472
/* 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);
473
ret = gnutls_init(session, GNUTLS_SERVER);
490
474
if(ret != GNUTLS_E_SUCCESS){
491
475
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
476
safer_gnutls_strerror(ret));
494
478
495
479
{
496
480
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);
481
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
504
482
if(ret != GNUTLS_E_SUCCESS){
505
483
fprintf(stderr, "Syntax error at: %s\n", err);
506
484
fprintf(stderr, "GnuTLS error: %s\n",
510
488
}
511
489
}
512
490
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);
491
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
492
mc.cred);
521
493
if(ret != GNUTLS_E_SUCCESS){
522
494
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
495
safer_gnutls_strerror(ret));
526
498
}
527
499
528
500
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
501
gnutls_certificate_server_set_request(*session,
502
GNUTLS_CERT_IGNORE);
530
503
531
504
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
505
541
514
static int start_mandos_communication(const char *ip, uint16_t port,
542
515
AvahiIfIndex if_index,
543
516
int af){
544
int ret, tcp_sd = -1;
517
int ret, tcp_sd;
545
518
ssize_t sret;
546
519
union {
547
520
struct sockaddr_in in;
548
521
struct sockaddr_in6 in6;
549
522
} to;
550
523
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
524
char *decrypted_buffer;
552
525
size_t buffer_length = 0;
553
526
size_t buffer_capacity = 0;
527
ssize_t decrypted_buffer_size;
554
528
size_t written;
555
int retval = -1;
529
int retval = 0;
556
530
gnutls_session_t session;
557
531
int pf; /* Protocol family */
558
532
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
533
switch(af){
567
534
case AF_INET6:
568
535
pf = PF_INET6;
572
539
break;
573
540
default:
574
541
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
542
return -1;
577
543
}
578
544
588
554
589
555
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
556
if(tcp_sd < 0){
591
int e = errno;
592
557
perror("socket");
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
558
return -1;
600
559
}
601
560
602
561
memset(&to, 0, sizeof(to));
603
562
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
563
to.in6.sin6_family = (uint16_t)af;
605
564
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
565
} else { /* IPv4 */
607
566
to.in.sin_family = (sa_family_t)af;
608
567
ret = inet_pton(af, ip, &to.in.sin_addr);
609
568
}
610
569
if(ret < 0 ){
611
int e = errno;
612
570
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
571
return -1;
615
572
}
616
573
if(ret == 0){
617
int e = errno;
618
574
fprintf(stderr, "Bad address: %s\n", ip);
619
errno = e;
620
goto mandos_end;
575
return -1;
621
576
}
622
577
if(af == AF_INET6){
623
578
to.in6.sin6_port = htons(port); /* Spurious warnings from
630
585
if(if_index == AVAHI_IF_UNSPEC){
631
586
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
587
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
588
return -1;
635
589
}
636
590
/* Set the network interface number as scope */
637
591
to.in6.sin6_scope_id = (uint32_t)if_index;
642
596
-Wunreachable-code */
643
597
}
644
598
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
650
599
if(debug){
651
600
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
601
char interface[IF_NAMESIZE];
679
628
}
680
629
}
681
630
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
631
if(af == AF_INET6){
688
632
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
633
} else {
690
634
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
635
}
692
636
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;
637
perror("connect");
638
return -1;
704
639
}
705
640
706
641
const char *out = mandos_protocol_version;
710
645
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
646
out_size - written));
712
647
if(ret == -1){
713
int e = errno;
714
648
perror("write");
715
errno = e;
649
retval = -1;
716
650
goto mandos_end;
717
651
}
718
652
written += (size_t)ret;
726
660
break;
727
661
}
728
662
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
663
}
735
664
736
665
if(debug){
737
666
fprintf(stderr, "Establishing TLS session with %s\n", ip);
738
667
}
739
668
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
669
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
670
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
671
do{
753
672
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
758
673
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
759
674
760
675
if(ret != GNUTLS_E_SUCCESS){
762
677
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
678
gnutls_perror(ret);
764
679
}
765
errno = EPROTO;
680
retval = -1;
766
681
goto mandos_end;
767
682
}
768
683
774
689
}
775
690
776
691
while(true){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
692
buffer_capacity = incbuffer(&buffer, buffer_length,
784
693
buffer_capacity);
785
694
if(buffer_capacity == 0){
786
int e = errno;
787
695
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
696
retval = -1;
794
697
goto mandos_end;
795
698
}
796
699
805
708
case GNUTLS_E_AGAIN:
806
709
break;
807
710
case GNUTLS_E_REHANDSHAKE:
808
do {
711
do{
809
712
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
713
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
714
if(ret < 0){
817
715
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
716
gnutls_perror(ret);
819
errno = EPROTO;
717
retval = -1;
820
718
goto mandos_end;
821
719
}
822
720
break;
823
721
default:
824
722
fprintf(stderr, "Unknown error while reading data from"
825
723
" encrypted session with Mandos server\n");
724
retval = -1;
826
725
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
828
726
goto mandos_end;
829
727
}
830
728
} else {
836
734
fprintf(stderr, "Closing TLS session\n");
837
735
}
838
736
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);
737
gnutls_bye(session, GNUTLS_SHUT_RDWR);
851
738
852
739
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
854
740
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
741
buffer_length,
856
742
&decrypted_buffer);
857
743
if(decrypted_buffer_size >= 0){
858
859
744
written = 0;
860
745
while(written < (size_t) decrypted_buffer_size){
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
746
ret = (int)fwrite(decrypted_buffer + written, 1,
867
747
(size_t)decrypted_buffer_size - written,
868
748
stdout);
869
749
if(ret == 0 and ferror(stdout)){
870
int e = errno;
871
750
if(debug){
872
751
fprintf(stderr, "Error writing encrypted data: %s\n",
873
752
strerror(errno));
874
753
}
875
errno = e;
876
goto mandos_end;
754
retval = -1;
755
break;
877
756
}
878
757
written += (size_t)ret;
879
758
}
880
retval = 0;
759
free(decrypted_buffer);
760
} else {
761
retval = -1;
881
762
}
763
} else {
764
retval = -1;
882
765
}
883
766
884
767
/* Shutdown procedure */
885
768
886
769
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;
770
free(buffer);
771
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
772
if(ret == -1){
773
perror("close");
906
774
}
775
gnutls_deinit(session);
907
776
return retval;
908
777
}
909
778
926
795
/* Called whenever a service has been resolved successfully or
927
796
timed out */
928
797
929
if(quit_now){
930
return;
931
}
932
933
798
switch(event){
934
799
default:
935
800
case AVAHI_RESOLVER_FAILURE:
972
837
/* Called whenever a new services becomes available on the LAN or
973
838
is removed from the LAN */
974
839
975
if(quit_now){
976
return;
977
}
978
979
840
switch(event){
980
841
default:
981
842
case AVAHI_BROWSER_FAILURE:
991
852
the callback function is called the Avahi server will free the
992
853
resolver for us. */
993
854
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
855
if(!(avahi_s_service_resolver_new(mc.server, interface,
856
protocol, name, type, domain,
857
AVAHI_PROTO_INET6, 0,
858
resolve_callback, NULL)))
997
859
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
860
name, avahi_strerror(avahi_server_errno(mc.server)));
999
861
break;
1010
872
}
1011
873
}
1012
874
1013
/* stop main loop after sigterm has been called */
1014
static void handle_sigterm(int sig){
875
sig_atomic_t quit_now = 0;
876
877
static void handle_sigterm(__attribute__((unused)) int sig){
1015
878
if(quit_now){
1016
879
return;
1017
880
}
1018
881
quit_now = 1;
1019
signal_received = sig;
1020
882
int old_errno = errno;
1021
883
if(mc.simple_poll != NULL){
1022
884
avahi_simple_poll_quit(mc.simple_poll);
1024
886
errno = old_errno;
1025
887
}
1026
888
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
889
int main(int argc, char *argv[]){
1123
890
AvahiSServiceBrowser *sb = NULL;
1124
891
int error;
1125
892
int ret;
1126
893
intmax_t tmpmax;
1127
char *tmp;
894
int numchars;
1128
895
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
896
const char *interface = "eth0";
1130
897
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
898
int sd;
1133
899
uid_t uid;
1134
900
gid_t gid;
901
char *connect_to = NULL;
1135
902
char tempdir[] = "/tmp/mandosXXXXXX";
1136
903
bool tempdir_created = false;
1137
904
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
905
const char *seckey = PATHDIR "/" SECKEY;
1139
906
const char *pubkey = PATHDIR "/" PUBKEY;
1140
907
908
/* Initialize Mandos context */
909
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
910
.dh_bits = 1024, .priority = "SECURE256"
911
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1141
912
bool gnutls_initialized = false;
1142
913
bool gpgme_initialized = false;
1143
float delay = 2.5f;
1144
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
914
double delay = 2.5;
915
916
struct sigaction old_sigterm_action;
1146
917
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1147
918
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
1169
919
{
1170
920
struct argp_option options[] = {
1171
921
{ .name = "debug", .key = 128,
1200
950
.arg = "SECONDS",
1201
951
.doc = "Maximum delay to wait for interface startup",
1202
952
.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
953
{ .name = NULL }
1213
954
};
1214
955
1215
956
error_t parse_opt(int key, char *arg,
1216
957
struct argp_state *state){
1217
errno = 0;
1218
958
switch(key){
1219
959
case 128: /* --debug */
1220
960
debug = true;
1232
972
pubkey = arg;
1233
973
break;
1234
974
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");
975
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
976
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
977
or arg[numchars] != '\0'){
978
fprintf(stderr, "Bad number of DH bits\n");
979
exit(EXIT_FAILURE);
1240
980
}
1241
981
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1242
982
break;
1244
984
mc.priority = arg;
1245
985
break;
1246
986
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");
987
ret = sscanf(arg, "%lf%n", &delay, &numchars);
988
if(ret < 1 or arg[numchars] != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
1251
991
}
1252
992
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);
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
1266
996
break;
1267
997
default:
1268
998
return ARGP_ERR_UNKNOWN;
1269
999
}
1270
return errno;
1000
return 0;
1271
1001
}
1272
1002
1273
1003
struct argp argp = { .options = options, .parser = parse_opt,
1274
1004
.args_doc = "",
1275
1005
.doc = "Mandos client -- Get and decrypt"
1276
1006
" passwords from a Mandos server" };
1277
ret = argp_parse(&argp, argc, argv,
1278
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1279
switch(ret){
1280
case 0:
1281
break;
1282
case ENOMEM:
1283
default:
1284
errno = ret;
1285
perror("argp_parse");
1286
exitcode = EX_OSERR;
1287
goto end;
1288
case EINVAL:
1289
exitcode = EX_USAGE;
1290
goto end;
1291
}
1292
}
1293
1294
if(not debug){
1295
avahi_set_log_function(empty_log);
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1318
1010
exitcode = EXIT_FAILURE;
1319
1011
goto end;
1320
1012
}
1321
1013
}
1322
1014
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
from the signal handler */
1325
/* Initialize the pseudo-RNG for Avahi */
1326
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1330
exitcode = EX_UNAVAILABLE;
1331
goto end;
1332
}
1333
1334
sigemptyset(&sigterm_action.sa_mask);
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
if(ret == -1){
1337
perror("sigaddset");
1338
exitcode = EX_OSERR;
1339
goto end;
1340
}
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
if(ret == -1){
1343
perror("sigaddset");
1344
exitcode = EX_OSERR;
1345
goto end;
1346
}
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
if(ret == -1){
1349
perror("sigaddset");
1350
exitcode = EX_OSERR;
1351
goto end;
1352
}
1353
/* Need to check if the handler is SIG_IGN before handling:
1354
| [[info:libc:Initial Signal Actions]] |
1355
| [[info:libc:Basic Signal Handling]] |
1356
*/
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
if(ret == -1){
1359
perror("sigaction");
1360
return EX_OSERR;
1361
}
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
if(ret == -1){
1365
perror("sigaction");
1366
exitcode = EX_OSERR;
1367
goto end;
1368
}
1369
}
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
if(ret == -1){
1372
perror("sigaction");
1373
return EX_OSERR;
1374
}
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
if(ret == -1){
1378
perror("sigaction");
1379
exitcode = EX_OSERR;
1380
goto end;
1381
}
1382
}
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
if(ret == -1){
1385
perror("sigaction");
1386
return EX_OSERR;
1387
}
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
1015
/* 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
1016
if(interface[0] != '\0'){
1417
1017
#ifdef __linux__
1418
1018
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1019
messages to mess up the prompt */
1420
1020
ret = klogctl(8, NULL, 5);
1421
1021
bool restore_loglevel = true;
1422
1022
if(ret == -1){
1428
1028
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
1029
if(sd < 0){
1430
1030
perror("socket");
1431
exitcode = EX_OSERR;
1031
exitcode = EXIT_FAILURE;
1432
1032
#ifdef __linux__
1433
1033
if(restore_loglevel){
1434
1034
ret = klogctl(7, NULL, 0);
1437
1037
}
1438
1038
}
1439
1039
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
1040
goto end;
1447
1041
}
1448
1042
strcpy(network.ifr_name, interface);
1457
1051
}
1458
1052
}
1459
1053
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1054
exitcode = EXIT_FAILURE;
1467
1055
goto end;
1468
1056
}
1469
1057
if((network.ifr_flags & IFF_UP) == 0){
1470
1058
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
1059
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
1060
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1061
perror("ioctl SIOCSIFFLAGS");
1062
exitcode = EXIT_FAILURE;
1477
1063
#ifdef __linux__
1478
1064
if(restore_loglevel){
1479
1065
ret = klogctl(7, NULL, 0);
1482
1068
}
1483
1069
}
1484
1070
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
1071
goto end;
1492
1072
}
1493
1073
}
1505
1085
perror("nanosleep");
1506
1086
}
1507
1087
}
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
}
1088
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1089
if(ret == -1){
1090
perror("close");
1514
1091
}
1515
1092
#ifdef __linux__
1516
1093
if(restore_loglevel){
1521
1098
}
1522
1099
}
1523
1100
#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;
1101
}
1102
1103
uid = getuid();
1104
gid = getgid();
1105
1106
errno = 0;
1107
setgid(gid);
1108
if(ret == -1){
1109
perror("setgid");
1110
}
1111
1112
ret = setuid(uid);
1113
if(ret == -1){
1114
perror("setuid");
1543
1115
}
1544
1116
1545
1117
ret = init_gnutls_global(pubkey, seckey);
1546
1118
if(ret == -1){
1547
1119
fprintf(stderr, "init_gnutls_global failed\n");
1548
exitcode = EX_UNAVAILABLE;
1120
exitcode = EXIT_FAILURE;
1549
1121
goto end;
1550
1122
} else {
1551
1123
gnutls_initialized = true;
1552
1124
}
1553
1125
1554
if(quit_now){
1555
goto end;
1556
}
1557
1558
tempdir_created = true;
1559
1126
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
1127
perror("mkdtemp");
1562
1128
goto end;
1563
1129
}
1564
1565
if(quit_now){
1566
goto end;
1567
}
1130
tempdir_created = true;
1568
1131
1569
1132
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
1133
fprintf(stderr, "init_gpgme failed\n");
1571
exitcode = EX_UNAVAILABLE;
1134
exitcode = EXIT_FAILURE;
1572
1135
goto end;
1573
1136
} else {
1574
1137
gpgme_initialized = true;
1575
1138
}
1576
1139
1577
if(quit_now){
1578
goto end;
1140
if(interface[0] != '\0'){
1141
if_index = (AvahiIfIndex) if_nametoindex(interface);
1142
if(if_index == 0){
1143
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1579
1147
}
1580
1148
1581
1149
if(connect_to != NULL){
1584
1152
char *address = strrchr(connect_to, ':');
1585
1153
if(address == NULL){
1586
1154
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
1155
exitcode = EXIT_FAILURE;
1156
goto end;
1157
}
1595
1158
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){
1159
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1160
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1161
or address[numchars+1] != '\0'){
1600
1162
fprintf(stderr, "Bad port number\n");
1601
exitcode = EX_USAGE;
1602
goto end;
1603
}
1604
1605
if(quit_now){
1606
goto end;
1607
}
1608
1163
exitcode = EXIT_FAILURE;
1164
goto end;
1165
}
1609
1166
port = (uint16_t)tmpmax;
1610
1167
*address = '\0';
1611
1168
address = connect_to;
1616
1173
} else {
1617
1174
af = AF_INET;
1618
1175
}
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){
1176
ret = start_mandos_communication(address, port, if_index, af);
1177
if(ret < 0){
1178
exitcode = EXIT_FAILURE;
1179
} else {
1633
1180
exitcode = EXIT_SUCCESS;
1634
1181
}
1635
1636
1182
goto end;
1637
1183
}
1638
1184
1639
if(quit_now){
1185
if(not debug){
1186
avahi_set_log_function(empty_log);
1187
}
1188
1189
/* Initialize the pseudo-RNG for Avahi */
1190
srand((unsigned int) time(NULL));
1191
1192
/* Allocate main Avahi loop object */
1193
mc.simple_poll = avahi_simple_poll_new();
1194
if(mc.simple_poll == NULL){
1195
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1196
exitcode = EXIT_FAILURE;
1640
1197
goto end;
1641
1198
}
1642
1199
1662
1219
if(mc.server == NULL){
1663
1220
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
1221
avahi_strerror(error));
1665
exitcode = EX_UNAVAILABLE;
1666
goto end;
1667
}
1668
1669
if(quit_now){
1222
exitcode = EXIT_FAILURE;
1670
1223
goto end;
1671
1224
}
1672
1225
1673
1226
/* Create the Avahi service browser */
1674
1227
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1228
AVAHI_PROTO_INET6, "_mandos._tcp",
1676
1229
NULL, 0, browse_callback, NULL);
1677
1230
if(sb == NULL){
1678
1231
fprintf(stderr, "Failed to create service browser: %s\n",
1679
1232
avahi_strerror(avahi_server_errno(mc.server)));
1680
exitcode = EX_UNAVAILABLE;
1233
exitcode = EXIT_FAILURE;
1681
1234
goto end;
1682
1235
}
1683
1236
1684
if(quit_now){
1685
goto end;
1686
}
1237
sigemptyset(&sigterm_action.sa_mask);
1238
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1239
if(ret == -1){
1240
perror("sigaddset");
1241
exitcode = EXIT_FAILURE;
1242
goto end;
1243
}
1244
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1245
if(ret == -1){
1246
perror("sigaddset");
1247
exitcode = EXIT_FAILURE;
1248
goto end;
1249
}
1250
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1251
if(ret == -1){
1252
perror("sigaddset");
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1257
if(ret == -1){
1258
perror("sigaction");
1259
exitcode = EXIT_FAILURE;
1260
goto end;
1261
}
1687
1262
1688
1263
/* Run the main loop */
1689
1264
1719
1294
gpgme_release(mc.ctx);
1720
1295
}
1721
1296
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
1297
/* Removes the temp directory used by GPGME */
1755
1298
if(tempdir_created){
1756
1299
DIR *d;
1795
1338
}
1796
1339
}
1797
1340
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
1341
return exitcode;
1818
1342
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0