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» Revision
269.1.3
(compared to revision 237.7.48)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2010-08-16 04:30:16 UTC
- mto: (237.2.182 mandos-local)
- mto: This revision was merged to the branch mainline in revision 270.
- 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
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
228
167
/*
229
168
* Initialize GPGME.
230
169
*/
244
183
245
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
246
185
if(fd == -1){
247
perror_plus("open");
186
perror("open");
248
187
return false;
249
188
}
250
189
264
203
265
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
266
205
if(ret == -1){
267
perror_plus("close");
206
perror("close");
268
207
}
269
208
gpgme_data_release(pgp_data);
270
209
return true;
283
222
return false;
284
223
}
285
224
286
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
287
226
rc = gpgme_get_engine_info(&engine_info);
288
227
if(rc != GPG_ERR_NO_ERROR){
289
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
395
334
396
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
397
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
398
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
399
338
plaintext_length = -1;
400
339
goto decrypt_end;
401
340
}
406
345
(size_t)plaintext_length,
407
346
plaintext_capacity);
408
347
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
348
perror("incbuffer");
410
349
plaintext_length = -1;
411
350
goto decrypt_end;
412
351
}
419
358
break;
420
359
}
421
360
if(ret < 0){
422
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
423
362
plaintext_length = -1;
424
363
goto decrypt_end;
425
364
}
482
421
}
483
422
484
423
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
486
425
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
488
430
safer_gnutls_strerror(ret));
489
431
gnutls_global_deinit();
490
432
return -1;
612
554
gnutls_session_t session;
613
555
int pf; /* Protocol family */
614
556
615
errno = 0;
616
617
557
if(quit_now){
618
errno = EINTR;
619
558
return -1;
620
559
}
621
560
628
567
break;
629
568
default:
630
569
fprintf(stderr, "Bad address family: %d\n", af);
631
errno = EINVAL;
632
570
return -1;
633
571
}
634
572
644
582
645
583
tcp_sd = socket(pf, SOCK_STREAM, 0);
646
584
if(tcp_sd < 0){
647
int e = errno;
648
perror_plus("socket");
649
errno = e;
585
perror("socket");
650
586
goto mandos_end;
651
587
}
652
588
653
589
if(quit_now){
654
errno = EINTR;
655
590
goto mandos_end;
656
591
}
657
592
664
599
ret = inet_pton(af, ip, &to.in.sin_addr);
665
600
}
666
601
if(ret < 0 ){
667
int e = errno;
668
perror_plus("inet_pton");
669
errno = e;
602
perror("inet_pton");
670
603
goto mandos_end;
671
604
}
672
605
if(ret == 0){
673
int e = errno;
674
606
fprintf(stderr, "Bad address: %s\n", ip);
675
errno = e;
676
607
goto mandos_end;
677
608
}
678
609
if(af == AF_INET6){
686
617
if(if_index == AVAHI_IF_UNSPEC){
687
618
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
619
" without a network interface\n");
689
errno = EINVAL;
690
620
goto mandos_end;
691
621
}
692
622
/* Set the network interface number as scope */
699
629
}
700
630
701
631
if(quit_now){
702
errno = EINTR;
703
632
goto mandos_end;
704
633
}
705
634
707
636
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
637
char interface[IF_NAMESIZE];
709
638
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
639
perror("if_indextoname");
711
640
} else {
712
641
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
642
ip, interface, port);
727
656
sizeof(addrstr));
728
657
}
729
658
if(pcret == NULL){
730
perror_plus("inet_ntop");
659
perror("inet_ntop");
731
660
} else {
732
661
if(strcmp(addrstr, ip) != 0){
733
662
fprintf(stderr, "Canonical address form: %s\n", addrstr);
736
665
}
737
666
738
667
if(quit_now){
739
errno = EINTR;
740
668
goto mandos_end;
741
669
}
742
670
746
674
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
675
}
748
676
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
677
perror("connect");
754
678
goto mandos_end;
755
679
}
756
680
757
681
if(quit_now){
758
errno = EINTR;
759
682
goto mandos_end;
760
683
}
761
684
766
689
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
690
out_size - written));
768
691
if(ret == -1){
769
int e = errno;
770
perror_plus("write");
771
errno = e;
692
perror("write");
772
693
goto mandos_end;
773
694
}
774
695
written += (size_t)ret;
784
705
}
785
706
786
707
if(quit_now){
787
errno = EINTR;
788
708
goto mandos_end;
789
709
}
790
710
}
794
714
}
795
715
796
716
if(quit_now){
797
errno = EINTR;
798
717
goto mandos_end;
799
718
}
800
719
801
/* Spurious warning from -Wint-to-pointer-cast */
802
720
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
803
721
804
722
if(quit_now){
805
errno = EINTR;
806
723
goto mandos_end;
807
724
}
808
725
809
726
do {
810
727
ret = gnutls_handshake(session);
811
728
if(quit_now){
812
errno = EINTR;
813
729
goto mandos_end;
814
730
}
815
731
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
819
735
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
820
736
gnutls_perror(ret);
821
737
}
822
errno = EPROTO;
823
738
goto mandos_end;
824
739
}
825
740
833
748
while(true){
834
749
835
750
if(quit_now){
836
errno = EINTR;
837
751
goto mandos_end;
838
752
}
839
753
840
754
buffer_capacity = incbuffer(&buffer, buffer_length,
841
755
buffer_capacity);
842
756
if(buffer_capacity == 0){
843
int e = errno;
844
perror_plus("incbuffer");
845
errno = e;
757
perror("incbuffer");
846
758
goto mandos_end;
847
759
}
848
760
849
761
if(quit_now){
850
errno = EINTR;
851
762
goto mandos_end;
852
763
}
853
764
866
777
ret = gnutls_handshake(session);
867
778
868
779
if(quit_now){
869
errno = EINTR;
870
780
goto mandos_end;
871
781
}
872
782
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
783
if(ret < 0){
874
784
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
875
785
gnutls_perror(ret);
876
errno = EPROTO;
877
786
goto mandos_end;
878
787
}
879
788
break;
881
790
fprintf(stderr, "Unknown error while reading data from"
882
791
" encrypted session with Mandos server\n");
883
792
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
885
793
goto mandos_end;
886
794
}
887
795
} else {
894
802
}
895
803
896
804
if(quit_now){
897
errno = EINTR;
898
805
goto mandos_end;
899
806
}
900
807
901
808
do {
902
809
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
903
810
if(quit_now){
904
errno = EINTR;
905
811
goto mandos_end;
906
812
}
907
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
916
822
written = 0;
917
823
while(written < (size_t) decrypted_buffer_size){
918
824
if(quit_now){
919
errno = EINTR;
920
825
goto mandos_end;
921
826
}
922
827
924
829
(size_t)decrypted_buffer_size - written,
925
830
stdout);
926
831
if(ret == 0 and ferror(stdout)){
927
int e = errno;
928
832
if(debug){
929
833
fprintf(stderr, "Error writing encrypted data: %s\n",
930
834
strerror(errno));
931
835
}
932
errno = e;
933
836
goto mandos_end;
934
837
}
935
838
written += (size_t)ret;
941
844
/* Shutdown procedure */
942
845
943
846
mandos_end:
944
{
945
int e = errno;
946
free(decrypted_buffer);
947
free(buffer);
948
if(tcp_sd >= 0){
949
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
950
}
951
if(ret == -1){
952
if(e == 0){
953
e = errno;
954
}
955
perror_plus("close");
956
}
957
gnutls_deinit(session);
958
errno = e;
959
if(quit_now){
960
errno = EINTR;
961
retval = -1;
962
}
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;
963
858
}
964
859
return retval;
965
860
}
1008
903
avahi_proto_to_af(proto));
1009
904
if(ret == 0){
1010
905
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1014
906
}
1015
907
}
1016
908
}
1070
962
}
1071
963
}
1072
964
1073
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1074
966
static void handle_sigterm(int sig){
1075
967
if(quit_now){
1076
968
return;
1078
970
quit_now = 1;
1079
971
signal_received = sig;
1080
972
int old_errno = errno;
1081
/* set main loop to exit */
1082
973
if(mc.simple_poll != NULL){
1083
974
avahi_simple_poll_quit(mc.simple_poll);
1084
975
}
1093
984
int good_interface(const struct dirent *if_entry){
1094
985
ssize_t ssret;
1095
986
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
988
if_entry->d_name);
1101
989
if(ret < 0){
1102
perror_plus("asprintf");
990
perror("asprintf");
991
return 0;
992
}
993
if(if_entry->d_name[0] == '.'){
1103
994
return 0;
1104
995
}
1105
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
997
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
998
perror("open");
1109
999
return 0;
1110
1000
}
1111
free(flagname);
1112
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
1002
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1115
1004
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
1005
flagstring[(size_t)to_read] = '\0';
1117
1006
if(flagstring == NULL){
1118
perror_plus("malloc");
1007
perror("malloc");
1119
1008
close(flags_fd);
1120
1009
return 0;
1121
1010
}
1123
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
1013
(size_t)to_read));
1125
1014
if(ssret == -1){
1126
perror_plus("read");
1015
perror("read");
1127
1016
free(flagstring);
1128
1017
close(flags_fd);
1129
1018
return 0;
1174
1063
}
1175
1064
return 0;
1176
1065
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
1066
/* Accept this device */
1186
1067
if(debug){
1187
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1190
1071
return 1;
1191
1072
}
1192
1073
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1199
return 0;
1200
}
1201
return 1;
1202
}
1203
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
int ret;
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1209
1210
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1215
}
1216
ret = avahi_simple_poll_iterate(s, -1);
1217
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1221
}
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
if(ret == -1){
1225
perror_plus("clock_gettime");
1226
return -1;
1227
}
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1232
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1234
/* total time is 10s/10,000ms.
1235
Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1243
}
1244
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1250
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1252
return 0;
1253
}
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1256
if(ret == -1){
1257
perror_plus("clock_gettime");
1258
return -1;
1259
}
1260
mc.current_server = mc.current_server->next;
1261
block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
1263
}
1264
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
}
1267
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
1270
}
1271
}
1272
}
1273
}
1274
1275
1074
int main(int argc, char *argv[]){
1276
1075
AvahiSServiceBrowser *sb = NULL;
1277
1076
int error;
1294
1093
bool gnutls_initialized = false;
1295
1094
bool gpgme_initialized = false;
1296
1095
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1299
1096
1300
1097
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1301
1098
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1307
1104
errno = 0;
1308
1105
ret = setgid(gid);
1309
1106
if(ret == -1){
1310
perror_plus("setgid");
1107
perror("setgid");
1311
1108
}
1312
1109
1313
1110
/* Lower user privileges (temporarily) */
1314
1111
errno = 0;
1315
1112
ret = seteuid(uid);
1316
1113
if(ret == -1){
1317
perror_plus("seteuid");
1114
perror("seteuid");
1318
1115
}
1319
1116
1320
1117
if(quit_now){
1355
1152
.arg = "SECONDS",
1356
1153
.doc = "Maximum delay to wait for interface startup",
1357
1154
.group = 2 },
1358
{ .name = "retry", .key = 132,
1359
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1361
.group = 2 },
1362
/*
1363
* These reproduce what we would get without ARGP_NO_HELP
1364
*/
1365
{ .name = "help", .key = '?',
1366
.doc = "Give this help list", .group = -1 },
1367
{ .name = "usage", .key = -3,
1368
.doc = "Give a short usage message", .group = -1 },
1369
{ .name = "version", .key = 'V',
1370
.doc = "Print program version", .group = -1 },
1371
1155
{ .name = NULL }
1372
1156
};
1373
1157
1374
1158
error_t parse_opt(int key, char *arg,
1375
1159
struct argp_state *state){
1376
errno = 0;
1377
1160
switch(key){
1378
1161
case 128: /* --debug */
1379
1162
debug = true;
1395
1178
tmpmax = strtoimax(arg, &tmp, 10);
1396
1179
if(errno != 0 or tmp == arg or *tmp != '\0'
1397
1180
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1398
argp_error(state, "Bad number of DH bits");
1181
fprintf(stderr, "Bad number of DH bits\n");
1182
exit(EXIT_FAILURE);
1399
1183
}
1400
1184
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1401
1185
break;
1406
1190
errno = 0;
1407
1191
delay = strtof(arg, &tmp);
1408
1192
if(errno != 0 or tmp == arg or *tmp != '\0'){
1409
argp_error(state, "Bad delay");
1410
}
1411
case 132: /* --retry */
1412
errno = 0;
1413
retry_interval = strtod(arg, &tmp);
1414
if(errno != 0 or tmp == arg or *tmp != '\0'
1415
or (retry_interval * 1000) > INT_MAX
1416
or retry_interval < 0){
1417
argp_error(state, "Bad retry interval");
1193
fprintf(stderr, "Bad delay\n");
1194
exit(EXIT_FAILURE);
1418
1195
}
1419
1196
break;
1420
/*
1421
* These reproduce what we would get without ARGP_NO_HELP
1422
*/
1423
case '?': /* --help */
1424
argp_state_help(state, state->out_stream,
1425
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1426
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1427
case -3: /* --usage */
1428
argp_state_help(state, state->out_stream,
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1432
exit(argp_err_exit_status);
1197
case ARGP_KEY_ARG:
1198
argp_usage(state);
1199
case ARGP_KEY_END:
1433
1200
break;
1434
1201
default:
1435
1202
return ARGP_ERR_UNKNOWN;
1436
1203
}
1437
return errno;
1204
return 0;
1438
1205
}
1439
1206
1440
1207
struct argp argp = { .options = options, .parser = parse_opt,
1441
1208
.args_doc = "",
1442
1209
.doc = "Mandos client -- Get and decrypt"
1443
1210
" passwords from a Mandos server" };
1444
ret = argp_parse(&argp, argc, argv,
1445
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1446
switch(ret){
1447
case 0:
1448
break;
1449
case ENOMEM:
1450
default:
1451
errno = ret;
1452
perror_plus("argp_parse");
1453
exitcode = EX_OSERR;
1454
goto end;
1455
case EINVAL:
1456
exitcode = EX_USAGE;
1457
goto end;
1458
}
1459
}
1460
1461
{
1462
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
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;
1518
1216
}
1519
1217
}
1520
1218
1533
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
1232
}
1535
1233
if(interface == NULL){
1536
perror_plus("malloc");
1234
perror("malloc");
1537
1235
free(direntries);
1538
1236
exitcode = EXIT_FAILURE;
1539
1237
goto end;
1554
1252
mc.simple_poll = avahi_simple_poll_new();
1555
1253
if(mc.simple_poll == NULL){
1556
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1557
exitcode = EX_UNAVAILABLE;
1255
exitcode = EXIT_FAILURE;
1558
1256
goto end;
1559
1257
}
1560
1258
1561
1259
sigemptyset(&sigterm_action.sa_mask);
1562
1260
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1563
1261
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
1566
1264
goto end;
1567
1265
}
1568
1266
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1569
1267
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
1572
1270
goto end;
1573
1271
}
1574
1272
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1575
1273
if(ret == -1){
1576
perror_plus("sigaddset");
1577
exitcode = EX_OSERR;
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
1578
1276
goto end;
1579
1277
}
1580
1278
/* Need to check if the handler is SIG_IGN before handling:
1583
1281
*/
1584
1282
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1585
1283
if(ret == -1){
1586
perror_plus("sigaction");
1587
return EX_OSERR;
1284
perror("sigaction");
1285
return EXIT_FAILURE;
1588
1286
}
1589
1287
if(old_sigterm_action.sa_handler != SIG_IGN){
1590
1288
ret = sigaction(SIGINT, &sigterm_action, NULL);
1591
1289
if(ret == -1){
1592
perror_plus("sigaction");
1593
exitcode = EX_OSERR;
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
1594
1292
goto end;
1595
1293
}
1596
1294
}
1597
1295
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1598
1296
if(ret == -1){
1599
perror_plus("sigaction");
1600
return EX_OSERR;
1297
perror("sigaction");
1298
return EXIT_FAILURE;
1601
1299
}
1602
1300
if(old_sigterm_action.sa_handler != SIG_IGN){
1603
1301
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1604
1302
if(ret == -1){
1605
perror_plus("sigaction");
1606
exitcode = EX_OSERR;
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
1607
1305
goto end;
1608
1306
}
1609
1307
}
1610
1308
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1611
1309
if(ret == -1){
1612
perror_plus("sigaction");
1613
return EX_OSERR;
1310
perror("sigaction");
1311
return EXIT_FAILURE;
1614
1312
}
1615
1313
if(old_sigterm_action.sa_handler != SIG_IGN){
1616
1314
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1617
1315
if(ret == -1){
1618
perror_plus("sigaction");
1619
exitcode = EX_OSERR;
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1620
1318
goto end;
1621
1319
}
1622
1320
}
1626
1324
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
1325
if(if_index == 0){
1628
1326
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1327
exitcode = EXIT_FAILURE;
1630
1328
goto end;
1631
1329
}
1632
1330
1638
1336
errno = 0;
1639
1337
ret = seteuid(0);
1640
1338
if(ret == -1){
1641
perror_plus("seteuid");
1339
perror("seteuid");
1642
1340
}
1643
1341
1644
1342
#ifdef __linux__
1645
1343
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1344
messages to mess up the prompt */
1647
1345
ret = klogctl(8, NULL, 5);
1648
1346
bool restore_loglevel = true;
1649
1347
if(ret == -1){
1650
1348
restore_loglevel = false;
1651
perror_plus("klogctl");
1349
perror("klogctl");
1652
1350
}
1653
1351
#endif /* __linux__ */
1654
1352
1655
1353
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
1354
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1355
perror("socket");
1356
exitcode = EXIT_FAILURE;
1659
1357
#ifdef __linux__
1660
1358
if(restore_loglevel){
1661
1359
ret = klogctl(7, NULL, 0);
1662
1360
if(ret == -1){
1663
perror_plus("klogctl");
1361
perror("klogctl");
1664
1362
}
1665
1363
}
1666
1364
#endif /* __linux__ */
1668
1366
errno = 0;
1669
1367
ret = seteuid(uid);
1670
1368
if(ret == -1){
1671
perror_plus("seteuid");
1369
perror("seteuid");
1672
1370
}
1673
1371
goto end;
1674
1372
}
1675
1373
strcpy(network.ifr_name, interface);
1676
1374
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
1375
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1376
perror("ioctl SIOCGIFFLAGS");
1679
1377
#ifdef __linux__
1680
1378
if(restore_loglevel){
1681
1379
ret = klogctl(7, NULL, 0);
1682
1380
if(ret == -1){
1683
perror_plus("klogctl");
1381
perror("klogctl");
1684
1382
}
1685
1383
}
1686
1384
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1385
exitcode = EXIT_FAILURE;
1688
1386
/* Lower privileges */
1689
1387
errno = 0;
1690
1388
ret = seteuid(uid);
1691
1389
if(ret == -1){
1692
perror_plus("seteuid");
1390
perror("seteuid");
1693
1391
}
1694
1392
goto end;
1695
1393
}
1699
1397
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
1398
if(ret == -1){
1701
1399
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1401
exitcode = EXIT_FAILURE;
1704
1402
#ifdef __linux__
1705
1403
if(restore_loglevel){
1706
1404
ret = klogctl(7, NULL, 0);
1707
1405
if(ret == -1){
1708
perror_plus("klogctl");
1406
perror("klogctl");
1709
1407
}
1710
1408
}
1711
1409
#endif /* __linux__ */
1713
1411
errno = 0;
1714
1412
ret = seteuid(uid);
1715
1413
if(ret == -1){
1716
perror_plus("seteuid");
1414
perror("seteuid");
1717
1415
}
1718
1416
goto end;
1719
1417
}
1720
1418
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1419
/* sleep checking until interface is running */
1723
1420
for(int i=0; i < delay * 4; i++){
1724
1421
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
1422
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1423
perror("ioctl SIOCGIFFLAGS");
1727
1424
} else if(network.ifr_flags & IFF_RUNNING){
1728
1425
break;
1729
1426
}
1730
1427
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
1428
ret = nanosleep(&sleeptime, NULL);
1732
1429
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1430
perror("nanosleep");
1734
1431
}
1735
1432
}
1736
1433
if(not take_down_interface){
1737
1434
/* We won't need the socket anymore */
1738
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
1436
if(ret == -1){
1740
perror_plus("close");
1437
perror("close");
1741
1438
}
1742
1439
}
1743
1440
#ifdef __linux__
1745
1442
/* Restores kernel loglevel to default */
1746
1443
ret = klogctl(7, NULL, 0);
1747
1444
if(ret == -1){
1748
perror_plus("klogctl");
1445
perror("klogctl");
1749
1446
}
1750
1447
}
1751
1448
#endif /* __linux__ */
1755
1452
/* Lower privileges */
1756
1453
ret = seteuid(uid);
1757
1454
if(ret == -1){
1758
perror_plus("seteuid");
1455
perror("seteuid");
1759
1456
}
1760
1457
} else {
1761
1458
/* Lower privileges permanently */
1762
1459
ret = setuid(uid);
1763
1460
if(ret == -1){
1764
perror_plus("setuid");
1461
perror("setuid");
1765
1462
}
1766
1463
}
1767
1464
}
1773
1470
ret = init_gnutls_global(pubkey, seckey);
1774
1471
if(ret == -1){
1775
1472
fprintf(stderr, "init_gnutls_global failed\n");
1776
exitcode = EX_UNAVAILABLE;
1473
exitcode = EXIT_FAILURE;
1777
1474
goto end;
1778
1475
} else {
1779
1476
gnutls_initialized = true;
1783
1480
goto end;
1784
1481
}
1785
1482
1483
tempdir_created = true;
1786
1484
if(mkdtemp(tempdir) == NULL){
1787
perror_plus("mkdtemp");
1485
tempdir_created = false;
1486
perror("mkdtemp");
1788
1487
goto end;
1789
1488
}
1790
tempdir_created = true;
1791
1489
1792
1490
if(quit_now){
1793
1491
goto end;
1795
1493
1796
1494
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
1495
fprintf(stderr, "init_gpgme failed\n");
1798
exitcode = EX_UNAVAILABLE;
1496
exitcode = EXIT_FAILURE;
1799
1497
goto end;
1800
1498
} else {
1801
1499
gpgme_initialized = true;
1811
1509
char *address = strrchr(connect_to, ':');
1812
1510
if(address == NULL){
1813
1511
fprintf(stderr, "No colon in address\n");
1814
exitcode = EX_USAGE;
1512
exitcode = EXIT_FAILURE;
1815
1513
goto end;
1816
1514
}
1817
1515
1825
1523
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
1524
or tmpmax != (uint16_t)tmpmax){
1827
1525
fprintf(stderr, "Bad port number\n");
1828
exitcode = EX_USAGE;
1526
exitcode = EXIT_FAILURE;
1829
1527
goto end;
1830
1528
}
1831
1529
1835
1533
1836
1534
port = (uint16_t)tmpmax;
1837
1535
*address = '\0';
1536
address = connect_to;
1838
1537
/* Colon in address indicates IPv6 */
1839
1538
int af;
1840
if(strchr(connect_to, ':') != NULL){
1539
if(strchr(address, ':') != NULL){
1841
1540
af = AF_INET6;
1842
/* Accept [] around IPv6 address - see RFC 5952 */
1843
if(connect_to[0] == '[' and address[-1] == ']')
1844
{
1845
connect_to++;
1846
address[-1] = '\0';
1847
}
1848
1541
} else {
1849
1542
af = AF_INET;
1850
1543
}
1851
address = connect_to;
1852
1544
1853
1545
if(quit_now){
1854
1546
goto end;
1855
1547
}
1856
1548
1857
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
1859
if(quit_now or ret == 0){
1860
break;
1861
}
1862
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
1865
}
1866
sleep((int)retry_interval);
1867
}
1868
1869
if (not quit_now){
1549
ret = start_mandos_communication(address, port, if_index, af);
1550
if(ret < 0){
1551
exitcode = EXIT_FAILURE;
1552
} else {
1870
1553
exitcode = EXIT_SUCCESS;
1871
1554
}
1872
1873
1555
goto end;
1874
1556
}
1875
1557
1899
1581
if(mc.server == NULL){
1900
1582
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
1583
avahi_strerror(error));
1902
exitcode = EX_UNAVAILABLE;
1584
exitcode = EXIT_FAILURE;
1903
1585
goto end;
1904
1586
}
1905
1587
1914
1596
if(sb == NULL){
1915
1597
fprintf(stderr, "Failed to create service browser: %s\n",
1916
1598
avahi_strerror(avahi_server_errno(mc.server)));
1917
exitcode = EX_UNAVAILABLE;
1599
exitcode = EXIT_FAILURE;
1918
1600
goto end;
1919
1601
}
1920
1602
1927
1609
if(debug){
1928
1610
fprintf(stderr, "Starting Avahi loop search\n");
1929
1611
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
1933
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
1936
}
1612
1613
avahi_simple_poll_loop(mc.simple_poll);
1937
1614
1938
1615
end:
1939
1616
1960
1637
if(gpgme_initialized){
1961
1638
gpgme_release(mc.ctx);
1962
1639
}
1963
1964
/* Cleans up the circular linked list of Mandos servers the client
1965
has seen */
1966
if(mc.current_server != NULL){
1967
mc.current_server->prev->next = NULL;
1968
while(mc.current_server != NULL){
1969
server *next = mc.current_server->next;
1970
free(mc.current_server);
1971
mc.current_server = next;
1972
}
1973
}
1974
1640
1975
1641
/* Take down the network interface */
1976
1642
if(take_down_interface){
1978
1644
errno = 0;
1979
1645
ret = seteuid(0);
1980
1646
if(ret == -1){
1981
perror_plus("seteuid");
1647
perror("seteuid");
1982
1648
}
1983
1649
if(geteuid() == 0){
1984
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
1651
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1652
perror("ioctl SIOCGIFFLAGS");
1987
1653
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
1989
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
1656
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1992
1658
}
1993
1659
}
1994
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
1661
if(ret == -1){
1996
perror_plus("close");
1662
perror("close");
1997
1663
}
1998
1664
/* Lower privileges permanently */
1999
1665
errno = 0;
2000
1666
ret = setuid(uid);
2001
1667
if(ret == -1){
2002
perror_plus("setuid");
1668
perror("setuid");
2003
1669
}
2004
1670
}
2005
1671
}
2006
1672
2007
/* Removes the GPGME temp directory and all files inside */
1673
/* Removes the temp directory used by GPGME */
2008
1674
if(tempdir_created){
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
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
}
2016
1695
char *fullname = NULL;
2017
1696
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
1697
direntry->d_name);
2019
1698
if(ret < 0){
2020
perror_plus("asprintf");
1699
perror("asprintf");
2021
1700
continue;
2022
1701
}
2023
1702
ret = remove(fullname);
2027
1706
}
2028
1707
free(fullname);
2029
1708
}
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
1709
closedir(d);
2036
1710
}
2037
1711
ret = rmdir(tempdir);
2038
1712
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
1713
perror("rmdir");
2040
1714
}
2041
1715
}
2042
1716
2047
1721
&old_sigterm_action,
2048
1722
NULL));
2049
1723
if(ret == -1){
2050
perror_plus("sigaction");
1724
perror("sigaction");
2051
1725
}
2052
1726
do {
2053
1727
ret = raise(signal_received);
2054
1728
} while(ret != 0 and errno == EINTR);
2055
1729
if(ret != 0){
2056
perror_plus("raise");
1730
perror("raise");
2057
1731
abort();
2058
1732
}
2059
1733
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0