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- Committer: teddy at bsnet
- Date: 2010-08-16 04:30:16 UTC
- mto: This revision was merged to the branch mainline in revision 419.
- Revision ID: teddy@fukt.bsnet.se-20100816043016-6wzjp3avb84gaejz
* mandos (main): Bug fix: Don't try to bind to an empty string
interface.
interface.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
85
89
86
#ifdef __linux__
90
87
#include <sys/klog.h> /* klogctl() */
131
128
static const char sys_class_net[] = "/sys/class/net";
132
129
char *connect_to = NULL;
133
130
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
144
145
131
/* Used for passing in values through the Avahi callback functions */
146
132
typedef struct {
147
133
AvahiSimplePoll *simple_poll;
151
137
gnutls_dh_params_t dh_params;
152
138
const char *priority;
153
139
gpgme_ctx_t ctx;
154
server *current_server;
155
140
} mandos_context;
156
141
157
142
/* global context so signal handler can reach it*/
158
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
144
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
162
146
163
147
sig_atomic_t quit_now = 0;
164
148
int signal_received = 0;
165
149
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
173
150
/*
174
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
152
* bytes. "buffer_capacity" is how much is currently allocated,
187
164
return buffer_capacity;
188
165
}
189
166
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
193
int ret;
194
server *new_server = malloc(sizeof(server));
195
if(new_server == NULL){
196
perror_plus("malloc");
197
return -1;
198
}
199
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
203
if(new_server->ip == NULL){
204
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
209
new_server->next = new_server;
210
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
213
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
216
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
225
}
226
227
167
/*
228
168
* Initialize GPGME.
229
169
*/
243
183
244
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
245
185
if(fd == -1){
246
perror_plus("open");
186
perror("open");
247
187
return false;
248
188
}
249
189
263
203
264
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
265
205
if(ret == -1){
266
perror_plus("close");
206
perror("close");
267
207
}
268
208
gpgme_data_release(pgp_data);
269
209
return true;
394
334
395
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
396
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
397
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
398
338
plaintext_length = -1;
399
339
goto decrypt_end;
400
340
}
405
345
(size_t)plaintext_length,
406
346
plaintext_capacity);
407
347
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
348
perror("incbuffer");
409
349
plaintext_length = -1;
410
350
goto decrypt_end;
411
351
}
418
358
break;
419
359
}
420
360
if(ret < 0){
421
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
422
362
plaintext_length = -1;
423
363
goto decrypt_end;
424
364
}
481
421
}
482
422
483
423
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
485
425
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
487
430
safer_gnutls_strerror(ret));
488
431
gnutls_global_deinit();
489
432
return -1;
611
554
gnutls_session_t session;
612
555
int pf; /* Protocol family */
613
556
614
errno = 0;
615
616
557
if(quit_now){
617
errno = EINTR;
618
558
return -1;
619
559
}
620
560
627
567
break;
628
568
default:
629
569
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
631
570
return -1;
632
571
}
633
572
643
582
644
583
tcp_sd = socket(pf, SOCK_STREAM, 0);
645
584
if(tcp_sd < 0){
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
585
perror("socket");
649
586
goto mandos_end;
650
587
}
651
588
652
589
if(quit_now){
653
errno = EINTR;
654
590
goto mandos_end;
655
591
}
656
592
663
599
ret = inet_pton(af, ip, &to.in.sin_addr);
664
600
}
665
601
if(ret < 0 ){
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
602
perror("inet_pton");
669
603
goto mandos_end;
670
604
}
671
605
if(ret == 0){
672
int e = errno;
673
606
fprintf(stderr, "Bad address: %s\n", ip);
674
errno = e;
675
607
goto mandos_end;
676
608
}
677
609
if(af == AF_INET6){
685
617
if(if_index == AVAHI_IF_UNSPEC){
686
618
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
619
" without a network interface\n");
688
errno = EINVAL;
689
620
goto mandos_end;
690
621
}
691
622
/* Set the network interface number as scope */
698
629
}
699
630
700
631
if(quit_now){
701
errno = EINTR;
702
632
goto mandos_end;
703
633
}
704
634
706
636
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
707
637
char interface[IF_NAMESIZE];
708
638
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
perror_plus("if_indextoname");
639
perror("if_indextoname");
710
640
} else {
711
641
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
642
ip, interface, port);
726
656
sizeof(addrstr));
727
657
}
728
658
if(pcret == NULL){
729
perror_plus("inet_ntop");
659
perror("inet_ntop");
730
660
} else {
731
661
if(strcmp(addrstr, ip) != 0){
732
662
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
665
}
736
666
737
667
if(quit_now){
738
errno = EINTR;
739
668
goto mandos_end;
740
669
}
741
670
745
674
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
675
}
747
676
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
677
perror("connect");
753
678
goto mandos_end;
754
679
}
755
680
756
681
if(quit_now){
757
errno = EINTR;
758
682
goto mandos_end;
759
683
}
760
684
765
689
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
690
out_size - written));
767
691
if(ret == -1){
768
int e = errno;
769
perror_plus("write");
770
errno = e;
692
perror("write");
771
693
goto mandos_end;
772
694
}
773
695
written += (size_t)ret;
783
705
}
784
706
785
707
if(quit_now){
786
errno = EINTR;
787
708
goto mandos_end;
788
709
}
789
710
}
793
714
}
794
715
795
716
if(quit_now){
796
errno = EINTR;
797
717
goto mandos_end;
798
718
}
799
719
800
/* Spurious warning from -Wint-to-pointer-cast */
801
720
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
721
803
722
if(quit_now){
804
errno = EINTR;
805
723
goto mandos_end;
806
724
}
807
725
808
726
do {
809
727
ret = gnutls_handshake(session);
810
728
if(quit_now){
811
errno = EINTR;
812
729
goto mandos_end;
813
730
}
814
731
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
818
735
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
819
736
gnutls_perror(ret);
820
737
}
821
errno = EPROTO;
822
738
goto mandos_end;
823
739
}
824
740
832
748
while(true){
833
749
834
750
if(quit_now){
835
errno = EINTR;
836
751
goto mandos_end;
837
752
}
838
753
839
754
buffer_capacity = incbuffer(&buffer, buffer_length,
840
755
buffer_capacity);
841
756
if(buffer_capacity == 0){
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
757
perror("incbuffer");
845
758
goto mandos_end;
846
759
}
847
760
848
761
if(quit_now){
849
errno = EINTR;
850
762
goto mandos_end;
851
763
}
852
764
865
777
ret = gnutls_handshake(session);
866
778
867
779
if(quit_now){
868
errno = EINTR;
869
780
goto mandos_end;
870
781
}
871
782
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
783
if(ret < 0){
873
784
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
874
785
gnutls_perror(ret);
875
errno = EPROTO;
876
786
goto mandos_end;
877
787
}
878
788
break;
880
790
fprintf(stderr, "Unknown error while reading data from"
881
791
" encrypted session with Mandos server\n");
882
792
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
884
793
goto mandos_end;
885
794
}
886
795
} else {
893
802
}
894
803
895
804
if(quit_now){
896
errno = EINTR;
897
805
goto mandos_end;
898
806
}
899
807
900
808
do {
901
809
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
902
810
if(quit_now){
903
errno = EINTR;
904
811
goto mandos_end;
905
812
}
906
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
915
822
written = 0;
916
823
while(written < (size_t) decrypted_buffer_size){
917
824
if(quit_now){
918
errno = EINTR;
919
825
goto mandos_end;
920
826
}
921
827
923
829
(size_t)decrypted_buffer_size - written,
924
830
stdout);
925
831
if(ret == 0 and ferror(stdout)){
926
int e = errno;
927
832
if(debug){
928
833
fprintf(stderr, "Error writing encrypted data: %s\n",
929
834
strerror(errno));
930
835
}
931
errno = e;
932
836
goto mandos_end;
933
837
}
934
838
written += (size_t)ret;
940
844
/* Shutdown procedure */
941
845
942
846
mandos_end:
943
{
944
int e = errno;
945
free(decrypted_buffer);
946
free(buffer);
947
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
949
}
950
if(ret == -1){
951
if(e == 0){
952
e = errno;
953
}
954
perror_plus("close");
955
}
956
gnutls_deinit(session);
957
errno = e;
958
if(quit_now){
959
errno = EINTR;
960
retval = -1;
961
}
847
free(decrypted_buffer);
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
962
858
}
963
859
return retval;
964
860
}
1007
903
avahi_proto_to_af(proto));
1008
904
if(ret == 0){
1009
905
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1013
906
}
1014
907
}
1015
908
}
1069
962
}
1070
963
}
1071
964
1072
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1073
966
static void handle_sigterm(int sig){
1074
967
if(quit_now){
1075
968
return;
1077
970
quit_now = 1;
1078
971
signal_received = sig;
1079
972
int old_errno = errno;
1080
/* set main loop to exit */
1081
973
if(mc.simple_poll != NULL){
1082
974
avahi_simple_poll_quit(mc.simple_poll);
1083
975
}
1092
984
int good_interface(const struct dirent *if_entry){
1093
985
ssize_t ssret;
1094
986
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
988
if_entry->d_name);
1100
989
if(ret < 0){
1101
perror_plus("asprintf");
990
perror("asprintf");
991
return 0;
992
}
993
if(if_entry->d_name[0] == '.'){
1102
994
return 0;
1103
995
}
1104
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
997
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
998
perror("open");
1108
999
return 0;
1109
1000
}
1110
free(flagname);
1111
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
1002
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
1004
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
1005
flagstring[(size_t)to_read] = '\0';
1116
1006
if(flagstring == NULL){
1117
perror_plus("malloc");
1007
perror("malloc");
1118
1008
close(flags_fd);
1119
1009
return 0;
1120
1010
}
1122
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
1013
(size_t)to_read));
1124
1014
if(ssret == -1){
1125
perror_plus("read");
1015
perror("read");
1126
1016
free(flagstring);
1127
1017
close(flags_fd);
1128
1018
return 0;
1173
1063
}
1174
1064
return 0;
1175
1065
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
1066
/* Accept this device */
1185
1067
if(debug){
1186
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1189
1071
return 1;
1190
1072
}
1191
1073
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
int ret;
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1208
1209
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1214
}
1215
ret = avahi_simple_poll_iterate(s, -1);
1216
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1220
}
1221
/* the current time */
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1223
if(ret == -1){
1224
perror_plus("clock_gettime");
1225
return -1;
1226
}
1227
/* Calculating in ms how long time between now and server
1228
who we visted longest time ago. Now - last seen. */
1229
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1231
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1233
/* total time is 10s/10,000ms.
1234
Converting to s from ms by dividing by 1,000,
1235
and ns to ms by dividing by 1,000,000. */
1236
block_time = ((retry_interval
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1242
}
1243
1244
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1249
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1251
return 0;
1252
}
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1255
if(ret == -1){
1256
perror_plus("clock_gettime");
1257
return -1;
1258
}
1259
mc.current_server = mc.current_server->next;
1260
block_time = 0; /* Call avahi to find new Mandos
1261
servers, but don't block */
1262
}
1263
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
}
1266
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1268
return (ret != 1) ? ret : 0;
1269
}
1270
}
1271
}
1272
}
1273
1274
1074
int main(int argc, char *argv[]){
1275
1075
AvahiSServiceBrowser *sb = NULL;
1276
1076
int error;
1293
1093
bool gnutls_initialized = false;
1294
1094
bool gpgme_initialized = false;
1295
1095
float delay = 2.5f;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
1298
1096
1299
1097
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1300
1098
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1306
1104
errno = 0;
1307
1105
ret = setgid(gid);
1308
1106
if(ret == -1){
1309
perror_plus("setgid");
1107
perror("setgid");
1310
1108
}
1311
1109
1312
1110
/* Lower user privileges (temporarily) */
1313
1111
errno = 0;
1314
1112
ret = seteuid(uid);
1315
1113
if(ret == -1){
1316
perror_plus("seteuid");
1114
perror("seteuid");
1317
1115
}
1318
1116
1319
1117
if(quit_now){
1354
1152
.arg = "SECONDS",
1355
1153
.doc = "Maximum delay to wait for interface startup",
1356
1154
.group = 2 },
1357
{ .name = "retry", .key = 132,
1358
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1360
.group = 2 },
1361
/*
1362
* These reproduce what we would get without ARGP_NO_HELP
1363
*/
1364
{ .name = "help", .key = '?',
1365
.doc = "Give this help list", .group = -1 },
1366
{ .name = "usage", .key = -3,
1367
.doc = "Give a short usage message", .group = -1 },
1368
{ .name = "version", .key = 'V',
1369
.doc = "Print program version", .group = -1 },
1370
1155
{ .name = NULL }
1371
1156
};
1372
1157
1373
1158
error_t parse_opt(int key, char *arg,
1374
1159
struct argp_state *state){
1375
errno = 0;
1376
1160
switch(key){
1377
1161
case 128: /* --debug */
1378
1162
debug = true;
1394
1178
tmpmax = strtoimax(arg, &tmp, 10);
1395
1179
if(errno != 0 or tmp == arg or *tmp != '\0'
1396
1180
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1397
argp_error(state, "Bad number of DH bits");
1181
fprintf(stderr, "Bad number of DH bits\n");
1182
exit(EXIT_FAILURE);
1398
1183
}
1399
1184
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1400
1185
break;
1405
1190
errno = 0;
1406
1191
delay = strtof(arg, &tmp);
1407
1192
if(errno != 0 or tmp == arg or *tmp != '\0'){
1408
argp_error(state, "Bad delay");
1409
}
1410
case 132: /* --retry */
1411
errno = 0;
1412
retry_interval = strtod(arg, &tmp);
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1415
argp_error(state, "Bad retry interval");
1193
fprintf(stderr, "Bad delay\n");
1194
exit(EXIT_FAILURE);
1416
1195
}
1417
1196
break;
1418
/*
1419
* These reproduce what we would get without ARGP_NO_HELP
1420
*/
1421
case '?': /* --help */
1422
argp_state_help(state, state->out_stream,
1423
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1424
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1425
case -3: /* --usage */
1426
argp_state_help(state, state->out_stream,
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1430
exit(argp_err_exit_status);
1197
case ARGP_KEY_ARG:
1198
argp_usage(state);
1199
case ARGP_KEY_END:
1431
1200
break;
1432
1201
default:
1433
1202
return ARGP_ERR_UNKNOWN;
1434
1203
}
1435
return errno;
1204
return 0;
1436
1205
}
1437
1206
1438
1207
struct argp argp = { .options = options, .parser = parse_opt,
1439
1208
.args_doc = "",
1440
1209
.doc = "Mandos client -- Get and decrypt"
1441
1210
" passwords from a Mandos server" };
1442
ret = argp_parse(&argp, argc, argv,
1443
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1444
switch(ret){
1445
case 0:
1446
break;
1447
case ENOMEM:
1448
default:
1449
errno = ret;
1450
perror_plus("argp_parse");
1451
exitcode = EX_OSERR;
1452
goto end;
1453
case EINVAL:
1454
exitcode = EX_USAGE;
1455
goto end;
1456
}
1457
}
1458
1459
{
1460
/* Work around Debian bug #633582:
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1211
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1212
if(ret == ARGP_ERR_UNKNOWN){
1213
fprintf(stderr, "Unknown error while parsing arguments\n");
1214
exitcode = EXIT_FAILURE;
1215
goto end;
1512
1216
}
1513
1217
}
1514
1218
1527
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
1232
}
1529
1233
if(interface == NULL){
1530
perror_plus("malloc");
1234
perror("malloc");
1531
1235
free(direntries);
1532
1236
exitcode = EXIT_FAILURE;
1533
1237
goto end;
1548
1252
mc.simple_poll = avahi_simple_poll_new();
1549
1253
if(mc.simple_poll == NULL){
1550
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1551
exitcode = EX_UNAVAILABLE;
1255
exitcode = EXIT_FAILURE;
1552
1256
goto end;
1553
1257
}
1554
1258
1555
1259
sigemptyset(&sigterm_action.sa_mask);
1556
1260
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1557
1261
if(ret == -1){
1558
perror_plus("sigaddset");
1559
exitcode = EX_OSERR;
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
1560
1264
goto end;
1561
1265
}
1562
1266
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1563
1267
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
1566
1270
goto end;
1567
1271
}
1568
1272
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1569
1273
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
1572
1276
goto end;
1573
1277
}
1574
1278
/* Need to check if the handler is SIG_IGN before handling:
1577
1281
*/
1578
1282
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1579
1283
if(ret == -1){
1580
perror_plus("sigaction");
1581
return EX_OSERR;
1284
perror("sigaction");
1285
return EXIT_FAILURE;
1582
1286
}
1583
1287
if(old_sigterm_action.sa_handler != SIG_IGN){
1584
1288
ret = sigaction(SIGINT, &sigterm_action, NULL);
1585
1289
if(ret == -1){
1586
perror_plus("sigaction");
1587
exitcode = EX_OSERR;
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
1588
1292
goto end;
1589
1293
}
1590
1294
}
1591
1295
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1592
1296
if(ret == -1){
1593
perror_plus("sigaction");
1594
return EX_OSERR;
1297
perror("sigaction");
1298
return EXIT_FAILURE;
1595
1299
}
1596
1300
if(old_sigterm_action.sa_handler != SIG_IGN){
1597
1301
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1598
1302
if(ret == -1){
1599
perror_plus("sigaction");
1600
exitcode = EX_OSERR;
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
1601
1305
goto end;
1602
1306
}
1603
1307
}
1604
1308
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1605
1309
if(ret == -1){
1606
perror_plus("sigaction");
1607
return EX_OSERR;
1310
perror("sigaction");
1311
return EXIT_FAILURE;
1608
1312
}
1609
1313
if(old_sigterm_action.sa_handler != SIG_IGN){
1610
1314
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1611
1315
if(ret == -1){
1612
perror_plus("sigaction");
1613
exitcode = EX_OSERR;
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1614
1318
goto end;
1615
1319
}
1616
1320
}
1620
1324
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
1325
if(if_index == 0){
1622
1326
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1327
exitcode = EXIT_FAILURE;
1624
1328
goto end;
1625
1329
}
1626
1330
1632
1336
errno = 0;
1633
1337
ret = seteuid(0);
1634
1338
if(ret == -1){
1635
perror_plus("seteuid");
1339
perror("seteuid");
1636
1340
}
1637
1341
1638
1342
#ifdef __linux__
1639
1343
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1344
messages to mess up the prompt */
1641
1345
ret = klogctl(8, NULL, 5);
1642
1346
bool restore_loglevel = true;
1643
1347
if(ret == -1){
1644
1348
restore_loglevel = false;
1645
perror_plus("klogctl");
1349
perror("klogctl");
1646
1350
}
1647
1351
#endif /* __linux__ */
1648
1352
1649
1353
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
1354
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1355
perror("socket");
1356
exitcode = EXIT_FAILURE;
1653
1357
#ifdef __linux__
1654
1358
if(restore_loglevel){
1655
1359
ret = klogctl(7, NULL, 0);
1656
1360
if(ret == -1){
1657
perror_plus("klogctl");
1361
perror("klogctl");
1658
1362
}
1659
1363
}
1660
1364
#endif /* __linux__ */
1662
1366
errno = 0;
1663
1367
ret = seteuid(uid);
1664
1368
if(ret == -1){
1665
perror_plus("seteuid");
1369
perror("seteuid");
1666
1370
}
1667
1371
goto end;
1668
1372
}
1669
1373
strcpy(network.ifr_name, interface);
1670
1374
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
1375
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1376
perror("ioctl SIOCGIFFLAGS");
1673
1377
#ifdef __linux__
1674
1378
if(restore_loglevel){
1675
1379
ret = klogctl(7, NULL, 0);
1676
1380
if(ret == -1){
1677
perror_plus("klogctl");
1381
perror("klogctl");
1678
1382
}
1679
1383
}
1680
1384
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1385
exitcode = EXIT_FAILURE;
1682
1386
/* Lower privileges */
1683
1387
errno = 0;
1684
1388
ret = seteuid(uid);
1685
1389
if(ret == -1){
1686
perror_plus("seteuid");
1390
perror("seteuid");
1687
1391
}
1688
1392
goto end;
1689
1393
}
1693
1397
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
1398
if(ret == -1){
1695
1399
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1401
exitcode = EXIT_FAILURE;
1698
1402
#ifdef __linux__
1699
1403
if(restore_loglevel){
1700
1404
ret = klogctl(7, NULL, 0);
1701
1405
if(ret == -1){
1702
perror_plus("klogctl");
1406
perror("klogctl");
1703
1407
}
1704
1408
}
1705
1409
#endif /* __linux__ */
1707
1411
errno = 0;
1708
1412
ret = seteuid(uid);
1709
1413
if(ret == -1){
1710
perror_plus("seteuid");
1414
perror("seteuid");
1711
1415
}
1712
1416
goto end;
1713
1417
}
1714
1418
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1419
/* sleep checking until interface is running */
1717
1420
for(int i=0; i < delay * 4; i++){
1718
1421
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
1422
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1423
perror("ioctl SIOCGIFFLAGS");
1721
1424
} else if(network.ifr_flags & IFF_RUNNING){
1722
1425
break;
1723
1426
}
1724
1427
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
1428
ret = nanosleep(&sleeptime, NULL);
1726
1429
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1430
perror("nanosleep");
1728
1431
}
1729
1432
}
1730
1433
if(not take_down_interface){
1731
1434
/* We won't need the socket anymore */
1732
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
1436
if(ret == -1){
1734
perror_plus("close");
1437
perror("close");
1735
1438
}
1736
1439
}
1737
1440
#ifdef __linux__
1739
1442
/* Restores kernel loglevel to default */
1740
1443
ret = klogctl(7, NULL, 0);
1741
1444
if(ret == -1){
1742
perror_plus("klogctl");
1445
perror("klogctl");
1743
1446
}
1744
1447
}
1745
1448
#endif /* __linux__ */
1749
1452
/* Lower privileges */
1750
1453
ret = seteuid(uid);
1751
1454
if(ret == -1){
1752
perror_plus("seteuid");
1455
perror("seteuid");
1753
1456
}
1754
1457
} else {
1755
1458
/* Lower privileges permanently */
1756
1459
ret = setuid(uid);
1757
1460
if(ret == -1){
1758
perror_plus("setuid");
1461
perror("setuid");
1759
1462
}
1760
1463
}
1761
1464
}
1767
1470
ret = init_gnutls_global(pubkey, seckey);
1768
1471
if(ret == -1){
1769
1472
fprintf(stderr, "init_gnutls_global failed\n");
1770
exitcode = EX_UNAVAILABLE;
1473
exitcode = EXIT_FAILURE;
1771
1474
goto end;
1772
1475
} else {
1773
1476
gnutls_initialized = true;
1777
1480
goto end;
1778
1481
}
1779
1482
1483
tempdir_created = true;
1780
1484
if(mkdtemp(tempdir) == NULL){
1781
perror_plus("mkdtemp");
1485
tempdir_created = false;
1486
perror("mkdtemp");
1782
1487
goto end;
1783
1488
}
1784
tempdir_created = true;
1785
1489
1786
1490
if(quit_now){
1787
1491
goto end;
1789
1493
1790
1494
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
1495
fprintf(stderr, "init_gpgme failed\n");
1792
exitcode = EX_UNAVAILABLE;
1496
exitcode = EXIT_FAILURE;
1793
1497
goto end;
1794
1498
} else {
1795
1499
gpgme_initialized = true;
1805
1509
char *address = strrchr(connect_to, ':');
1806
1510
if(address == NULL){
1807
1511
fprintf(stderr, "No colon in address\n");
1808
exitcode = EX_USAGE;
1512
exitcode = EXIT_FAILURE;
1809
1513
goto end;
1810
1514
}
1811
1515
1819
1523
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
1524
or tmpmax != (uint16_t)tmpmax){
1821
1525
fprintf(stderr, "Bad port number\n");
1822
exitcode = EX_USAGE;
1526
exitcode = EXIT_FAILURE;
1823
1527
goto end;
1824
1528
}
1825
1529
1841
1545
if(quit_now){
1842
1546
goto end;
1843
1547
}
1844
1845
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
1847
if(quit_now or ret == 0){
1848
break;
1849
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
1548
1549
ret = start_mandos_communication(address, port, if_index, af);
1550
if(ret < 0){
1551
exitcode = EXIT_FAILURE;
1552
} else {
1854
1553
exitcode = EXIT_SUCCESS;
1855
1554
}
1856
1857
1555
goto end;
1858
1556
}
1859
1557
1883
1581
if(mc.server == NULL){
1884
1582
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
1583
avahi_strerror(error));
1886
exitcode = EX_UNAVAILABLE;
1584
exitcode = EXIT_FAILURE;
1887
1585
goto end;
1888
1586
}
1889
1587
1898
1596
if(sb == NULL){
1899
1597
fprintf(stderr, "Failed to create service browser: %s\n",
1900
1598
avahi_strerror(avahi_server_errno(mc.server)));
1901
exitcode = EX_UNAVAILABLE;
1599
exitcode = EXIT_FAILURE;
1902
1600
goto end;
1903
1601
}
1904
1602
1911
1609
if(debug){
1912
1610
fprintf(stderr, "Starting Avahi loop search\n");
1913
1611
}
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
1917
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
1920
}
1612
1613
avahi_simple_poll_loop(mc.simple_poll);
1921
1614
1922
1615
end:
1923
1616
1944
1637
if(gpgme_initialized){
1945
1638
gpgme_release(mc.ctx);
1946
1639
}
1947
1948
/* Cleans up the circular linked list of Mandos servers the client
1949
has seen */
1950
if(mc.current_server != NULL){
1951
mc.current_server->prev->next = NULL;
1952
while(mc.current_server != NULL){
1953
server *next = mc.current_server->next;
1954
free(mc.current_server);
1955
mc.current_server = next;
1956
}
1957
}
1958
1640
1959
1641
/* Take down the network interface */
1960
1642
if(take_down_interface){
1962
1644
errno = 0;
1963
1645
ret = seteuid(0);
1964
1646
if(ret == -1){
1965
perror_plus("seteuid");
1647
perror("seteuid");
1966
1648
}
1967
1649
if(geteuid() == 0){
1968
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
1651
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1652
perror("ioctl SIOCGIFFLAGS");
1971
1653
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
1973
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
1656
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1976
1658
}
1977
1659
}
1978
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
1661
if(ret == -1){
1980
perror_plus("close");
1662
perror("close");
1981
1663
}
1982
1664
/* Lower privileges permanently */
1983
1665
errno = 0;
1984
1666
ret = setuid(uid);
1985
1667
if(ret == -1){
1986
perror_plus("setuid");
1668
perror("setuid");
1987
1669
}
1988
1670
}
1989
1671
}
1990
1672
1991
/* Removes the GPGME temp directory and all files inside */
1673
/* Removes the temp directory used by GPGME */
1992
1674
if(tempdir_created){
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1675
DIR *d;
1676
struct dirent *direntry;
1677
d = opendir(tempdir);
1678
if(d == NULL){
1679
if(errno != ENOENT){
1680
perror("opendir");
1681
}
1682
} else {
1683
while(true){
1684
direntry = readdir(d);
1685
if(direntry == NULL){
1686
break;
1687
}
1688
/* Skip "." and ".." */
1689
if(direntry->d_name[0] == '.'
1690
and (direntry->d_name[1] == '\0'
1691
or (direntry->d_name[1] == '.'
1692
and direntry->d_name[2] == '\0'))){
1693
continue;
1694
}
1999
1695
char *fullname = NULL;
2000
1696
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
1697
direntry->d_name);
2002
1698
if(ret < 0){
2003
perror_plus("asprintf");
1699
perror("asprintf");
2004
1700
continue;
2005
1701
}
2006
1702
ret = remove(fullname);
2010
1706
}
2011
1707
free(fullname);
2012
1708
}
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
1709
closedir(d);
2020
1710
}
2021
1711
ret = rmdir(tempdir);
2022
1712
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
1713
perror("rmdir");
2024
1714
}
2025
1715
}
2026
1716
2031
1721
&old_sigterm_action,
2032
1722
NULL));
2033
1723
if(ret == -1){
2034
perror_plus("sigaction");
1724
perror("sigaction");
2035
1725
}
2036
1726
do {
2037
1727
ret = raise(signal_received);
2038
1728
} while(ret != 0 and errno == EINTR);
2039
1729
if(ret != 0){
2040
perror_plus("raise");
1730
perror("raise");
2041
1731
abort();
2042
1732
}
2043
1733
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0