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- Committer: teddy at bsnet
- Date: 2011-11-11 09:07:09 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111111090709-0fejxcxn4my8g8ry
* plugins.d/mandos-client.c (good_interface): Use SIOCGIFFLAGS instead
of reading
/sys/class/net/*/flags.
of reading
/sys/class/net/*/flags.
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
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
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
76
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
126
127
bool debug = false;
127
128
static const char mandos_protocol_version[] = "1";
128
129
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
131
static const char sys_class_net[] = "/sys/class/net";
131
132
char *connect_to = NULL;
132
133
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
133
145
/* Used for passing in values through the Avahi callback functions */
134
146
typedef struct {
135
147
AvahiSimplePoll *simple_poll;
139
151
gnutls_dh_params_t dh_params;
140
152
const char *priority;
141
153
gpgme_ctx_t ctx;
154
server *current_server;
142
155
} mandos_context;
143
156
144
157
/* global context so signal handler can reach it*/
145
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
159
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
148
162
149
163
sig_atomic_t quit_now = 0;
150
164
int signal_received = 0;
151
165
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
152
173
/*
153
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
175
* bytes. "buffer_capacity" is how much is currently allocated,
166
187
return buffer_capacity;
167
188
}
168
189
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
169
228
/*
170
229
* Initialize GPGME.
171
230
*/
185
244
186
245
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
246
if(fd == -1){
188
perror("open");
247
perror_plus("open");
189
248
return false;
190
249
}
191
250
205
264
206
265
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
266
if(ret == -1){
208
perror("close");
267
perror_plus("close");
209
268
}
210
269
gpgme_data_release(pgp_data);
211
270
return true;
224
283
return false;
225
284
}
226
285
227
/* Set GPGME home directory for the OpenPGP engine only */
286
/* Set GPGME home directory for the OpenPGP engine only */
228
287
rc = gpgme_get_engine_info(&engine_info);
229
288
if(rc != GPG_ERR_NO_ERROR){
230
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
336
395
337
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
397
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
398
perror_plus("gpgme_data_seek");
340
399
plaintext_length = -1;
341
400
goto decrypt_end;
342
401
}
347
406
(size_t)plaintext_length,
348
407
plaintext_capacity);
349
408
if(plaintext_capacity == 0){
350
perror("incbuffer");
409
perror_plus("incbuffer");
351
410
plaintext_length = -1;
352
411
goto decrypt_end;
353
412
}
360
419
break;
361
420
}
362
421
if(ret < 0){
363
perror("gpgme_data_read");
422
perror_plus("gpgme_data_read");
364
423
plaintext_length = -1;
365
424
goto decrypt_end;
366
425
}
423
482
}
424
483
425
484
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
486
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
487
fprintf(stderr, "GnuTLS memory error: %s\n",
432
488
safer_gnutls_strerror(ret));
433
489
gnutls_global_deinit();
434
490
return -1;
589
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
646
if(tcp_sd < 0){
591
647
int e = errno;
592
perror("socket");
648
perror_plus("socket");
593
649
errno = e;
594
650
goto mandos_end;
595
651
}
609
665
}
610
666
if(ret < 0 ){
611
667
int e = errno;
612
perror("inet_pton");
668
perror_plus("inet_pton");
613
669
errno = e;
614
670
goto mandos_end;
615
671
}
651
707
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
708
char interface[IF_NAMESIZE];
653
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
710
perror_plus("if_indextoname");
655
711
} else {
656
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
713
ip, interface, port);
671
727
sizeof(addrstr));
672
728
}
673
729
if(pcret == NULL){
674
perror("inet_ntop");
730
perror_plus("inet_ntop");
675
731
} else {
676
732
if(strcmp(addrstr, ip) != 0){
677
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
690
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
747
}
692
748
if(ret < 0){
693
int e = errno;
694
perror("connect");
695
errno = e;
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
696
754
goto mandos_end;
697
755
}
698
756
709
767
out_size - written));
710
768
if(ret == -1){
711
769
int e = errno;
712
perror("write");
770
perror_plus("write");
713
771
errno = e;
714
772
goto mandos_end;
715
773
}
740
798
goto mandos_end;
741
799
}
742
800
801
/* Spurious warning from -Wint-to-pointer-cast */
743
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
744
803
745
804
if(quit_now){
782
841
buffer_capacity);
783
842
if(buffer_capacity == 0){
784
843
int e = errno;
785
perror("incbuffer");
844
perror_plus("incbuffer");
786
845
errno = e;
787
846
goto mandos_end;
788
847
}
893
952
if(e == 0){
894
953
e = errno;
895
954
}
896
perror("close");
955
perror_plus("close");
897
956
}
898
957
gnutls_deinit(session);
958
errno = e;
899
959
if(quit_now){
900
e = EINTR;
960
errno = EINTR;
901
961
retval = -1;
902
962
}
903
errno = e;
904
963
}
905
964
return retval;
906
965
}
949
1008
avahi_proto_to_af(proto));
950
1009
if(ret == 0){
951
1010
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
952
1014
}
953
1015
}
954
1016
}
1008
1070
}
1009
1071
}
1010
1072
1011
/* stop main loop after sigterm has been called */
1073
/* Signal handler that stops main loop after SIGTERM */
1012
1074
static void handle_sigterm(int sig){
1013
1075
if(quit_now){
1014
1076
return;
1016
1078
quit_now = 1;
1017
1079
signal_received = sig;
1018
1080
int old_errno = errno;
1081
/* set main loop to exit */
1019
1082
if(mc.simple_poll != NULL){
1020
1083
avahi_simple_poll_quit(mc.simple_poll);
1021
1084
}
1022
1085
errno = old_errno;
1023
1086
}
1024
1087
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1088
bool get_flags(const char *ifname, struct ifreq *ifr){
1089
int ret;
1090
1091
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1092
if(s < 0){
1093
perror_plus("socket");
1094
return false;
1095
}
1096
strcpy(ifr->ifr_name, ifname);
1097
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1098
if(ret == -1){
1079
1099
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1100
perror_plus("ioctl SIOCGIFFLAGS");
1082
1101
}
1083
free(flagstring);
1084
return 0;
1102
return false;
1085
1103
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1104
return true;
1105
}
1106
1107
bool good_flags(const char *ifname, const struct ifreq *ifr){
1108
1088
1109
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1110
if(ifr->ifr_flags & IFF_LOOPBACK){
1090
1111
if(debug){
1091
1112
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1113
ifname);
1093
1114
}
1094
return 0;
1115
return false;
1095
1116
}
1096
1117
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1118
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1098
1119
if(debug){
1099
1120
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1121
ifname);
1101
1122
}
1102
return 1;
1123
return true;
1103
1124
}
1104
1125
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1126
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1106
1127
if(debug){
1107
1128
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1129
ifname);
1130
}
1131
return false;
1132
}
1133
/* Reject non-ARP interfaces (including dummy interfaces) */
1134
if(ifr->ifr_flags & IFF_NOARP){
1135
if(debug){
1136
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1137
}
1138
return false;
1139
}
1140
1112
1141
/* Accept this device */
1113
1142
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1143
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1144
}
1145
return true;
1146
}
1147
1148
/*
1149
* This function determines if a directory entry in /sys/class/net
1150
* corresponds to an acceptable network device.
1151
* (This function is passed to scandir(3) as a filter function.)
1152
*/
1153
int good_interface(const struct dirent *if_entry){
1154
int ret;
1155
if(if_entry->d_name[0] == '.'){
1156
return 0;
1157
}
1158
struct ifreq ifr;
1159
1160
if(not get_flags(if_entry->d_name, &ifr)){
1161
return 0;
1162
}
1163
1164
if(not good_flags(if_entry->d_name, &ifr)){
1165
return 0;
1166
}
1167
return 1;
1168
}
1169
1170
int notdotentries(const struct dirent *direntry){
1171
/* Skip "." and ".." */
1172
if(direntry->d_name[0] == '.'
1173
and (direntry->d_name[1] == '\0'
1174
or (direntry->d_name[1] == '.'
1175
and direntry->d_name[2] == '\0'))){
1176
return 0;
1177
}
1178
return 1;
1179
}
1180
1181
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1182
int ret;
1183
struct timespec now;
1184
struct timespec waited_time;
1185
intmax_t block_time;
1186
1187
while(true){
1188
if(mc.current_server == NULL){
1189
if (debug){
1190
fprintf(stderr,
1191
"Wait until first server is found. No timeout!\n");
1192
}
1193
ret = avahi_simple_poll_iterate(s, -1);
1194
} else {
1195
if (debug){
1196
fprintf(stderr, "Check current_server if we should run it,"
1197
" or wait\n");
1198
}
1199
/* the current time */
1200
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1201
if(ret == -1){
1202
perror_plus("clock_gettime");
1203
return -1;
1204
}
1205
/* Calculating in ms how long time between now and server
1206
who we visted longest time ago. Now - last seen. */
1207
waited_time.tv_sec = (now.tv_sec
1208
- mc.current_server->last_seen.tv_sec);
1209
waited_time.tv_nsec = (now.tv_nsec
1210
- mc.current_server->last_seen.tv_nsec);
1211
/* total time is 10s/10,000ms.
1212
Converting to s from ms by dividing by 1,000,
1213
and ns to ms by dividing by 1,000,000. */
1214
block_time = ((retry_interval
1215
- ((intmax_t)waited_time.tv_sec * 1000))
1216
- ((intmax_t)waited_time.tv_nsec / 1000000));
1217
1218
if (debug){
1219
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1220
}
1221
1222
if(block_time <= 0){
1223
ret = start_mandos_communication(mc.current_server->ip,
1224
mc.current_server->port,
1225
mc.current_server->if_index,
1226
mc.current_server->af);
1227
if(ret == 0){
1228
avahi_simple_poll_quit(mc.simple_poll);
1229
return 0;
1230
}
1231
ret = clock_gettime(CLOCK_MONOTONIC,
1232
&mc.current_server->last_seen);
1233
if(ret == -1){
1234
perror_plus("clock_gettime");
1235
return -1;
1236
}
1237
mc.current_server = mc.current_server->next;
1238
block_time = 0; /* Call avahi to find new Mandos
1239
servers, but don't block */
1240
}
1241
1242
ret = avahi_simple_poll_iterate(s, (int)block_time);
1243
}
1244
if(ret != 0){
1245
if (ret > 0 or errno != EINTR) {
1246
return (ret != 1) ? ret : 0;
1247
}
1248
}
1249
}
1118
1250
}
1119
1251
1120
1252
int main(int argc, char *argv[]){
1139
1271
bool gnutls_initialized = false;
1140
1272
bool gpgme_initialized = false;
1141
1273
float delay = 2.5f;
1274
double retry_interval = 10; /* 10s between trying a server and
1275
retrying the same server again */
1142
1276
1143
1277
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
1278
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1150
1284
errno = 0;
1151
1285
ret = setgid(gid);
1152
1286
if(ret == -1){
1153
perror("setgid");
1287
perror_plus("setgid");
1154
1288
}
1155
1289
1156
1290
/* Lower user privileges (temporarily) */
1157
1291
errno = 0;
1158
1292
ret = seteuid(uid);
1159
1293
if(ret == -1){
1160
perror("seteuid");
1294
perror_plus("seteuid");
1161
1295
}
1162
1296
1163
1297
if(quit_now){
1198
1332
.arg = "SECONDS",
1199
1333
.doc = "Maximum delay to wait for interface startup",
1200
1334
.group = 2 },
1335
{ .name = "retry", .key = 132,
1336
.arg = "SECONDS",
1337
.doc = "Retry interval used when denied by the mandos server",
1338
.group = 2 },
1201
1339
/*
1202
1340
* These reproduce what we would get without ARGP_NO_HELP
1203
1341
*/
1247
1385
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
1386
argp_error(state, "Bad delay");
1249
1387
}
1388
case 132: /* --retry */
1389
errno = 0;
1390
retry_interval = strtod(arg, &tmp);
1391
if(errno != 0 or tmp == arg or *tmp != '\0'
1392
or (retry_interval * 1000) > INT_MAX
1393
or retry_interval < 0){
1394
argp_error(state, "Bad retry interval");
1395
}
1250
1396
break;
1251
1397
/*
1252
1398
* These reproduce what we would get without ARGP_NO_HELP
1280
1426
case ENOMEM:
1281
1427
default:
1282
1428
errno = ret;
1283
perror("argp_parse");
1429
perror_plus("argp_parse");
1284
1430
exitcode = EX_OSERR;
1285
1431
goto end;
1286
1432
case EINVAL:
1288
1434
goto end;
1289
1435
}
1290
1436
}
1437
1438
{
1439
/* Work around Debian bug #633582:
1440
<http://bugs.debian.org/633582> */
1441
struct stat st;
1442
1443
/* Re-raise priviliges */
1444
errno = 0;
1445
ret = seteuid(0);
1446
if(ret == -1){
1447
perror_plus("seteuid");
1448
}
1449
1450
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1451
int seckey_fd = open(seckey, O_RDONLY);
1452
if(seckey_fd == -1){
1453
perror_plus("open");
1454
} else {
1455
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1456
if(ret == -1){
1457
perror_plus("fstat");
1458
} else {
1459
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1460
ret = fchown(seckey_fd, uid, gid);
1461
if(ret == -1){
1462
perror_plus("fchown");
1463
}
1464
}
1465
}
1466
TEMP_FAILURE_RETRY(close(seckey_fd));
1467
}
1468
}
1469
1470
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1471
int pubkey_fd = open(pubkey, O_RDONLY);
1472
if(pubkey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_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(pubkey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(pubkey_fd));
1487
}
1488
}
1489
1490
/* Lower privileges */
1491
errno = 0;
1492
ret = seteuid(uid);
1493
if(ret == -1){
1494
perror_plus("seteuid");
1495
}
1496
}
1291
1497
1292
1498
if(not debug){
1293
1499
avahi_set_log_function(empty_log);
1304
1510
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
1511
}
1306
1512
if(interface == NULL){
1307
perror("malloc");
1513
perror_plus("malloc");
1308
1514
free(direntries);
1309
1515
exitcode = EXIT_FAILURE;
1310
1516
goto end;
1332
1538
sigemptyset(&sigterm_action.sa_mask);
1333
1539
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
1540
if(ret == -1){
1335
perror("sigaddset");
1541
perror_plus("sigaddset");
1336
1542
exitcode = EX_OSERR;
1337
1543
goto end;
1338
1544
}
1339
1545
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
1546
if(ret == -1){
1341
perror("sigaddset");
1547
perror_plus("sigaddset");
1342
1548
exitcode = EX_OSERR;
1343
1549
goto end;
1344
1550
}
1345
1551
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
1552
if(ret == -1){
1347
perror("sigaddset");
1553
perror_plus("sigaddset");
1348
1554
exitcode = EX_OSERR;
1349
1555
goto end;
1350
1556
}
1354
1560
*/
1355
1561
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
1562
if(ret == -1){
1357
perror("sigaction");
1563
perror_plus("sigaction");
1358
1564
return EX_OSERR;
1359
1565
}
1360
1566
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
1567
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
1568
if(ret == -1){
1363
perror("sigaction");
1569
perror_plus("sigaction");
1364
1570
exitcode = EX_OSERR;
1365
1571
goto end;
1366
1572
}
1367
1573
}
1368
1574
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
1575
if(ret == -1){
1370
perror("sigaction");
1576
perror_plus("sigaction");
1371
1577
return EX_OSERR;
1372
1578
}
1373
1579
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
1580
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
1581
if(ret == -1){
1376
perror("sigaction");
1582
perror_plus("sigaction");
1377
1583
exitcode = EX_OSERR;
1378
1584
goto end;
1379
1585
}
1380
1586
}
1381
1587
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
1588
if(ret == -1){
1383
perror("sigaction");
1589
perror_plus("sigaction");
1384
1590
return EX_OSERR;
1385
1591
}
1386
1592
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
1593
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
1594
if(ret == -1){
1389
perror("sigaction");
1595
perror_plus("sigaction");
1390
1596
exitcode = EX_OSERR;
1391
1597
goto end;
1392
1598
}
1409
1615
errno = 0;
1410
1616
ret = seteuid(0);
1411
1617
if(ret == -1){
1412
perror("seteuid");
1618
perror_plus("seteuid");
1413
1619
}
1414
1620
1415
1621
#ifdef __linux__
1419
1625
bool restore_loglevel = true;
1420
1626
if(ret == -1){
1421
1627
restore_loglevel = false;
1422
perror("klogctl");
1628
perror_plus("klogctl");
1423
1629
}
1424
1630
#endif /* __linux__ */
1425
1631
1426
1632
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
1633
if(sd < 0){
1428
perror("socket");
1634
perror_plus("socket");
1429
1635
exitcode = EX_OSERR;
1430
1636
#ifdef __linux__
1431
1637
if(restore_loglevel){
1432
1638
ret = klogctl(7, NULL, 0);
1433
1639
if(ret == -1){
1434
perror("klogctl");
1640
perror_plus("klogctl");
1435
1641
}
1436
1642
}
1437
1643
#endif /* __linux__ */
1439
1645
errno = 0;
1440
1646
ret = seteuid(uid);
1441
1647
if(ret == -1){
1442
perror("seteuid");
1648
perror_plus("seteuid");
1443
1649
}
1444
1650
goto end;
1445
1651
}
1446
1652
strcpy(network.ifr_name, interface);
1447
1653
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
1654
if(ret == -1){
1449
perror("ioctl SIOCGIFFLAGS");
1655
perror_plus("ioctl SIOCGIFFLAGS");
1450
1656
#ifdef __linux__
1451
1657
if(restore_loglevel){
1452
1658
ret = klogctl(7, NULL, 0);
1453
1659
if(ret == -1){
1454
perror("klogctl");
1660
perror_plus("klogctl");
1455
1661
}
1456
1662
}
1457
1663
#endif /* __linux__ */
1460
1666
errno = 0;
1461
1667
ret = seteuid(uid);
1462
1668
if(ret == -1){
1463
perror("seteuid");
1669
perror_plus("seteuid");
1464
1670
}
1465
1671
goto end;
1466
1672
}
1470
1676
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
1677
if(ret == -1){
1472
1678
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1679
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1474
1680
exitcode = EX_OSERR;
1475
1681
#ifdef __linux__
1476
1682
if(restore_loglevel){
1477
1683
ret = klogctl(7, NULL, 0);
1478
1684
if(ret == -1){
1479
perror("klogctl");
1685
perror_plus("klogctl");
1480
1686
}
1481
1687
}
1482
1688
#endif /* __linux__ */
1484
1690
errno = 0;
1485
1691
ret = seteuid(uid);
1486
1692
if(ret == -1){
1487
perror("seteuid");
1693
perror_plus("seteuid");
1488
1694
}
1489
1695
goto end;
1490
1696
}
1491
1697
}
1492
/* sleep checking until interface is running */
1698
/* Sleep checking until interface is running.
1699
Check every 0.25s, up to total time of delay */
1493
1700
for(int i=0; i < delay * 4; i++){
1494
1701
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
1702
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
1703
perror_plus("ioctl SIOCGIFFLAGS");
1497
1704
} else if(network.ifr_flags & IFF_RUNNING){
1498
1705
break;
1499
1706
}
1500
1707
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
1708
ret = nanosleep(&sleeptime, NULL);
1502
1709
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1710
perror_plus("nanosleep");
1504
1711
}
1505
1712
}
1506
1713
if(not take_down_interface){
1507
1714
/* We won't need the socket anymore */
1508
1715
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
1716
if(ret == -1){
1510
perror("close");
1717
perror_plus("close");
1511
1718
}
1512
1719
}
1513
1720
#ifdef __linux__
1515
1722
/* Restores kernel loglevel to default */
1516
1723
ret = klogctl(7, NULL, 0);
1517
1724
if(ret == -1){
1518
perror("klogctl");
1725
perror_plus("klogctl");
1519
1726
}
1520
1727
}
1521
1728
#endif /* __linux__ */
1525
1732
/* Lower privileges */
1526
1733
ret = seteuid(uid);
1527
1734
if(ret == -1){
1528
perror("seteuid");
1735
perror_plus("seteuid");
1529
1736
}
1530
1737
} else {
1531
1738
/* Lower privileges permanently */
1532
1739
ret = setuid(uid);
1533
1740
if(ret == -1){
1534
perror("setuid");
1741
perror_plus("setuid");
1535
1742
}
1536
1743
}
1537
1744
}
1553
1760
goto end;
1554
1761
}
1555
1762
1763
if(mkdtemp(tempdir) == NULL){
1764
perror_plus("mkdtemp");
1765
goto end;
1766
}
1556
1767
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
perror("mkdtemp");
1560
goto end;
1561
}
1562
1768
1563
1769
if(quit_now){
1564
1770
goto end;
1606
1812
1607
1813
port = (uint16_t)tmpmax;
1608
1814
*address = '\0';
1609
address = connect_to;
1610
1815
/* Colon in address indicates IPv6 */
1611
1816
int af;
1612
if(strchr(address, ':') != NULL){
1817
if(strchr(connect_to, ':') != NULL){
1613
1818
af = AF_INET6;
1819
/* Accept [] around IPv6 address - see RFC 5952 */
1820
if(connect_to[0] == '[' and address[-1] == ']')
1821
{
1822
connect_to++;
1823
address[-1] = '\0';
1824
}
1614
1825
} else {
1615
1826
af = AF_INET;
1616
1827
}
1828
address = connect_to;
1617
1829
1618
1830
if(quit_now){
1619
1831
goto end;
1620
1832
}
1621
1833
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
1834
while(not quit_now){
1835
ret = start_mandos_communication(address, port, if_index, af);
1836
if(quit_now or ret == 0){
1837
break;
1838
}
1839
if(debug){
1840
fprintf(stderr, "Retrying in %d seconds\n",
1841
(int)retry_interval);
1842
}
1843
sleep((int)retry_interval);
1844
}
1845
1846
if (not quit_now){
1644
1847
exitcode = EXIT_SUCCESS;
1645
1848
}
1849
1646
1850
goto end;
1647
1851
}
1648
1852
1700
1904
if(debug){
1701
1905
fprintf(stderr, "Starting Avahi loop search\n");
1702
1906
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
1907
1908
ret = avahi_loop_with_timeout(mc.simple_poll,
1909
(int)(retry_interval * 1000));
1910
if(debug){
1911
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1912
(ret == 0) ? "successfully" : "with error");
1913
}
1705
1914
1706
1915
end:
1707
1916
1728
1937
if(gpgme_initialized){
1729
1938
gpgme_release(mc.ctx);
1730
1939
}
1940
1941
/* Cleans up the circular linked list of Mandos servers the client
1942
has seen */
1943
if(mc.current_server != NULL){
1944
mc.current_server->prev->next = NULL;
1945
while(mc.current_server != NULL){
1946
server *next = mc.current_server->next;
1947
free(mc.current_server);
1948
mc.current_server = next;
1949
}
1950
}
1731
1951
1732
1952
/* Take down the network interface */
1733
1953
if(take_down_interface){
1735
1955
errno = 0;
1736
1956
ret = seteuid(0);
1737
1957
if(ret == -1){
1738
perror("seteuid");
1958
perror_plus("seteuid");
1739
1959
}
1740
1960
if(geteuid() == 0){
1741
1961
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
1962
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1963
perror_plus("ioctl SIOCGIFFLAGS");
1744
1964
} else if(network.ifr_flags & IFF_UP) {
1745
1965
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
1966
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
1967
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1968
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1749
1969
}
1750
1970
}
1751
1971
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
1972
if(ret == -1){
1753
perror("close");
1973
perror_plus("close");
1754
1974
}
1755
1975
/* Lower privileges permanently */
1756
1976
errno = 0;
1757
1977
ret = setuid(uid);
1758
1978
if(ret == -1){
1759
perror("setuid");
1979
perror_plus("setuid");
1760
1980
}
1761
1981
}
1762
1982
}
1763
1983
1764
/* Removes the temp directory used by GPGME */
1984
/* Removes the GPGME temp directory and all files inside */
1765
1985
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
1986
struct dirent **direntries = NULL;
1987
struct dirent *direntry = NULL;
1988
int numentries = scandir(tempdir, &direntries, notdotentries,
1989
alphasort);
1990
if (numentries > 0){
1991
for(int i = 0; i < numentries; i++){
1992
direntry = direntries[i];
1786
1993
char *fullname = NULL;
1787
1994
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
1995
direntry->d_name);
1789
1996
if(ret < 0){
1790
perror("asprintf");
1997
perror_plus("asprintf");
1791
1998
continue;
1792
1999
}
1793
2000
ret = remove(fullname);
1797
2004
}
1798
2005
free(fullname);
1799
2006
}
1800
closedir(d);
2007
}
2008
2009
/* need to clean even if 0 because man page doesn't specify */
2010
free(direntries);
2011
if (numentries == -1){
2012
perror_plus("scandir");
1801
2013
}
1802
2014
ret = rmdir(tempdir);
1803
2015
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
2016
perror_plus("rmdir");
1805
2017
}
1806
2018
}
1807
2019
1812
2024
&old_sigterm_action,
1813
2025
NULL));
1814
2026
if(ret == -1){
1815
perror("sigaction");
2027
perror_plus("sigaction");
1816
2028
}
1817
2029
do {
1818
2030
ret = raise(signal_received);
1819
2031
} while(ret != 0 and errno == EINTR);
1820
2032
if(ret != 0){
1821
perror("raise");
2033
perror_plus("raise");
1822
2034
abort();
1823
2035
}
1824
2036
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0