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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 */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
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);
692
748
if(ret < 0){
693
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
750
int e = errno;
695
perror("connect");
751
perror_plus("connect");
696
752
errno = e;
697
753
}
698
754
goto mandos_end;
711
767
out_size - written));
712
768
if(ret == -1){
713
769
int e = errno;
714
perror("write");
770
perror_plus("write");
715
771
errno = e;
716
772
goto mandos_end;
717
773
}
742
798
goto mandos_end;
743
799
}
744
800
801
/* Spurious warning from -Wint-to-pointer-cast */
745
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
803
747
804
if(quit_now){
784
841
buffer_capacity);
785
842
if(buffer_capacity == 0){
786
843
int e = errno;
787
perror("incbuffer");
844
perror_plus("incbuffer");
788
845
errno = e;
789
846
goto mandos_end;
790
847
}
895
952
if(e == 0){
896
953
e = errno;
897
954
}
898
perror("close");
955
perror_plus("close");
899
956
}
900
957
gnutls_deinit(session);
958
errno = e;
901
959
if(quit_now){
902
e = EINTR;
960
errno = EINTR;
903
961
retval = -1;
904
962
}
905
errno = e;
906
963
}
907
964
return retval;
908
965
}
951
1008
avahi_proto_to_af(proto));
952
1009
if(ret == 0){
953
1010
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
954
1014
}
955
1015
}
956
1016
}
1010
1070
}
1011
1071
}
1012
1072
1013
/* stop main loop after sigterm has been called */
1073
/* Signal handler that stops main loop after SIGTERM */
1014
1074
static void handle_sigterm(int sig){
1015
1075
if(quit_now){
1016
1076
return;
1018
1078
quit_now = 1;
1019
1079
signal_received = sig;
1020
1080
int old_errno = errno;
1081
/* set main loop to exit */
1021
1082
if(mc.simple_poll != NULL){
1022
1083
avahi_simple_poll_quit(mc.simple_poll);
1023
1084
}
1024
1085
errno = old_errno;
1025
1086
}
1026
1087
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
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){
1081
1099
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1100
perror_plus("ioctl SIOCGIFFLAGS");
1084
1101
}
1085
free(flagstring);
1086
return 0;
1102
return false;
1087
1103
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1104
return true;
1105
}
1106
1107
bool good_flags(const char *ifname, const struct ifreq *ifr){
1108
1090
1109
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1110
if(ifr->ifr_flags & IFF_LOOPBACK){
1092
1111
if(debug){
1093
1112
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1113
ifname);
1095
1114
}
1096
return 0;
1115
return false;
1097
1116
}
1098
1117
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1118
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1100
1119
if(debug){
1101
1120
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1121
ifname);
1103
1122
}
1104
return 1;
1123
return true;
1105
1124
}
1106
1125
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1126
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1108
1127
if(debug){
1109
1128
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
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
1114
1141
/* Accept this device */
1115
1142
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
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
}
1120
1250
}
1121
1251
1122
1252
int main(int argc, char *argv[]){
1141
1271
bool gnutls_initialized = false;
1142
1272
bool gpgme_initialized = false;
1143
1273
float delay = 2.5f;
1274
double retry_interval = 10; /* 10s between trying a server and
1275
retrying the same server again */
1144
1276
1145
1277
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
1278
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
1284
errno = 0;
1153
1285
ret = setgid(gid);
1154
1286
if(ret == -1){
1155
perror("setgid");
1287
perror_plus("setgid");
1156
1288
}
1157
1289
1158
1290
/* Lower user privileges (temporarily) */
1159
1291
errno = 0;
1160
1292
ret = seteuid(uid);
1161
1293
if(ret == -1){
1162
perror("seteuid");
1294
perror_plus("seteuid");
1163
1295
}
1164
1296
1165
1297
if(quit_now){
1200
1332
.arg = "SECONDS",
1201
1333
.doc = "Maximum delay to wait for interface startup",
1202
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 },
1203
1339
/*
1204
1340
* These reproduce what we would get without ARGP_NO_HELP
1205
1341
*/
1249
1385
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
1386
argp_error(state, "Bad delay");
1251
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
}
1252
1396
break;
1253
1397
/*
1254
1398
* These reproduce what we would get without ARGP_NO_HELP
1282
1426
case ENOMEM:
1283
1427
default:
1284
1428
errno = ret;
1285
perror("argp_parse");
1429
perror_plus("argp_parse");
1286
1430
exitcode = EX_OSERR;
1287
1431
goto end;
1288
1432
case EINVAL:
1290
1434
goto end;
1291
1435
}
1292
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
}
1293
1497
1294
1498
if(not debug){
1295
1499
avahi_set_log_function(empty_log);
1306
1510
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
1511
}
1308
1512
if(interface == NULL){
1309
perror("malloc");
1513
perror_plus("malloc");
1310
1514
free(direntries);
1311
1515
exitcode = EXIT_FAILURE;
1312
1516
goto end;
1334
1538
sigemptyset(&sigterm_action.sa_mask);
1335
1539
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
1540
if(ret == -1){
1337
perror("sigaddset");
1541
perror_plus("sigaddset");
1338
1542
exitcode = EX_OSERR;
1339
1543
goto end;
1340
1544
}
1341
1545
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
1546
if(ret == -1){
1343
perror("sigaddset");
1547
perror_plus("sigaddset");
1344
1548
exitcode = EX_OSERR;
1345
1549
goto end;
1346
1550
}
1347
1551
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
1552
if(ret == -1){
1349
perror("sigaddset");
1553
perror_plus("sigaddset");
1350
1554
exitcode = EX_OSERR;
1351
1555
goto end;
1352
1556
}
1356
1560
*/
1357
1561
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
1562
if(ret == -1){
1359
perror("sigaction");
1563
perror_plus("sigaction");
1360
1564
return EX_OSERR;
1361
1565
}
1362
1566
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
1567
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
1568
if(ret == -1){
1365
perror("sigaction");
1569
perror_plus("sigaction");
1366
1570
exitcode = EX_OSERR;
1367
1571
goto end;
1368
1572
}
1369
1573
}
1370
1574
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
1575
if(ret == -1){
1372
perror("sigaction");
1576
perror_plus("sigaction");
1373
1577
return EX_OSERR;
1374
1578
}
1375
1579
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
1580
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
1581
if(ret == -1){
1378
perror("sigaction");
1582
perror_plus("sigaction");
1379
1583
exitcode = EX_OSERR;
1380
1584
goto end;
1381
1585
}
1382
1586
}
1383
1587
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
1588
if(ret == -1){
1385
perror("sigaction");
1589
perror_plus("sigaction");
1386
1590
return EX_OSERR;
1387
1591
}
1388
1592
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
1593
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
1594
if(ret == -1){
1391
perror("sigaction");
1595
perror_plus("sigaction");
1392
1596
exitcode = EX_OSERR;
1393
1597
goto end;
1394
1598
}
1411
1615
errno = 0;
1412
1616
ret = seteuid(0);
1413
1617
if(ret == -1){
1414
perror("seteuid");
1618
perror_plus("seteuid");
1415
1619
}
1416
1620
1417
1621
#ifdef __linux__
1421
1625
bool restore_loglevel = true;
1422
1626
if(ret == -1){
1423
1627
restore_loglevel = false;
1424
perror("klogctl");
1628
perror_plus("klogctl");
1425
1629
}
1426
1630
#endif /* __linux__ */
1427
1631
1428
1632
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
1633
if(sd < 0){
1430
perror("socket");
1634
perror_plus("socket");
1431
1635
exitcode = EX_OSERR;
1432
1636
#ifdef __linux__
1433
1637
if(restore_loglevel){
1434
1638
ret = klogctl(7, NULL, 0);
1435
1639
if(ret == -1){
1436
perror("klogctl");
1640
perror_plus("klogctl");
1437
1641
}
1438
1642
}
1439
1643
#endif /* __linux__ */
1441
1645
errno = 0;
1442
1646
ret = seteuid(uid);
1443
1647
if(ret == -1){
1444
perror("seteuid");
1648
perror_plus("seteuid");
1445
1649
}
1446
1650
goto end;
1447
1651
}
1448
1652
strcpy(network.ifr_name, interface);
1449
1653
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
1654
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1655
perror_plus("ioctl SIOCGIFFLAGS");
1452
1656
#ifdef __linux__
1453
1657
if(restore_loglevel){
1454
1658
ret = klogctl(7, NULL, 0);
1455
1659
if(ret == -1){
1456
perror("klogctl");
1660
perror_plus("klogctl");
1457
1661
}
1458
1662
}
1459
1663
#endif /* __linux__ */
1462
1666
errno = 0;
1463
1667
ret = seteuid(uid);
1464
1668
if(ret == -1){
1465
perror("seteuid");
1669
perror_plus("seteuid");
1466
1670
}
1467
1671
goto end;
1468
1672
}
1472
1676
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
1677
if(ret == -1){
1474
1678
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1679
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1476
1680
exitcode = EX_OSERR;
1477
1681
#ifdef __linux__
1478
1682
if(restore_loglevel){
1479
1683
ret = klogctl(7, NULL, 0);
1480
1684
if(ret == -1){
1481
perror("klogctl");
1685
perror_plus("klogctl");
1482
1686
}
1483
1687
}
1484
1688
#endif /* __linux__ */
1486
1690
errno = 0;
1487
1691
ret = seteuid(uid);
1488
1692
if(ret == -1){
1489
perror("seteuid");
1693
perror_plus("seteuid");
1490
1694
}
1491
1695
goto end;
1492
1696
}
1493
1697
}
1494
/* sleep checking until interface is running */
1698
/* Sleep checking until interface is running.
1699
Check every 0.25s, up to total time of delay */
1495
1700
for(int i=0; i < delay * 4; i++){
1496
1701
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
1702
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1703
perror_plus("ioctl SIOCGIFFLAGS");
1499
1704
} else if(network.ifr_flags & IFF_RUNNING){
1500
1705
break;
1501
1706
}
1502
1707
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
1708
ret = nanosleep(&sleeptime, NULL);
1504
1709
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1710
perror_plus("nanosleep");
1506
1711
}
1507
1712
}
1508
1713
if(not take_down_interface){
1509
1714
/* We won't need the socket anymore */
1510
1715
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
1716
if(ret == -1){
1512
perror("close");
1717
perror_plus("close");
1513
1718
}
1514
1719
}
1515
1720
#ifdef __linux__
1517
1722
/* Restores kernel loglevel to default */
1518
1723
ret = klogctl(7, NULL, 0);
1519
1724
if(ret == -1){
1520
perror("klogctl");
1725
perror_plus("klogctl");
1521
1726
}
1522
1727
}
1523
1728
#endif /* __linux__ */
1527
1732
/* Lower privileges */
1528
1733
ret = seteuid(uid);
1529
1734
if(ret == -1){
1530
perror("seteuid");
1735
perror_plus("seteuid");
1531
1736
}
1532
1737
} else {
1533
1738
/* Lower privileges permanently */
1534
1739
ret = setuid(uid);
1535
1740
if(ret == -1){
1536
perror("setuid");
1741
perror_plus("setuid");
1537
1742
}
1538
1743
}
1539
1744
}
1555
1760
goto end;
1556
1761
}
1557
1762
1763
if(mkdtemp(tempdir) == NULL){
1764
perror_plus("mkdtemp");
1765
goto end;
1766
}
1558
1767
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
1768
1565
1769
if(quit_now){
1566
1770
goto end;
1608
1812
1609
1813
port = (uint16_t)tmpmax;
1610
1814
*address = '\0';
1611
address = connect_to;
1612
1815
/* Colon in address indicates IPv6 */
1613
1816
int af;
1614
if(strchr(address, ':') != NULL){
1817
if(strchr(connect_to, ':') != NULL){
1615
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
}
1616
1825
} else {
1617
1826
af = AF_INET;
1618
1827
}
1828
address = connect_to;
1619
1829
1620
1830
if(quit_now){
1621
1831
goto end;
1622
1832
}
1623
1833
1624
1834
while(not quit_now){
1625
1835
ret = start_mandos_communication(address, port, if_index, af);
1626
1836
if(quit_now or ret == 0){
1627
1837
break;
1628
1838
}
1629
sleep(15);
1630
};
1631
1839
if(debug){
1840
fprintf(stderr, "Retrying in %d seconds\n",
1841
(int)retry_interval);
1842
}
1843
sleep((int)retry_interval);
1844
}
1845
1632
1846
if (not quit_now){
1633
1847
exitcode = EXIT_SUCCESS;
1634
1848
}
1690
1904
if(debug){
1691
1905
fprintf(stderr, "Starting Avahi loop search\n");
1692
1906
}
1693
1694
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
}
1695
1914
1696
1915
end:
1697
1916
1718
1937
if(gpgme_initialized){
1719
1938
gpgme_release(mc.ctx);
1720
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
}
1721
1951
1722
1952
/* Take down the network interface */
1723
1953
if(take_down_interface){
1725
1955
errno = 0;
1726
1956
ret = seteuid(0);
1727
1957
if(ret == -1){
1728
perror("seteuid");
1958
perror_plus("seteuid");
1729
1959
}
1730
1960
if(geteuid() == 0){
1731
1961
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
1962
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1963
perror_plus("ioctl SIOCGIFFLAGS");
1734
1964
} else if(network.ifr_flags & IFF_UP) {
1735
1965
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
1966
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
1967
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1968
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1739
1969
}
1740
1970
}
1741
1971
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
1972
if(ret == -1){
1743
perror("close");
1973
perror_plus("close");
1744
1974
}
1745
1975
/* Lower privileges permanently */
1746
1976
errno = 0;
1747
1977
ret = setuid(uid);
1748
1978
if(ret == -1){
1749
perror("setuid");
1979
perror_plus("setuid");
1750
1980
}
1751
1981
}
1752
1982
}
1753
1983
1754
/* Removes the temp directory used by GPGME */
1984
/* Removes the GPGME temp directory and all files inside */
1755
1985
if(tempdir_created){
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
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];
1776
1993
char *fullname = NULL;
1777
1994
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
1995
direntry->d_name);
1779
1996
if(ret < 0){
1780
perror("asprintf");
1997
perror_plus("asprintf");
1781
1998
continue;
1782
1999
}
1783
2000
ret = remove(fullname);
1787
2004
}
1788
2005
free(fullname);
1789
2006
}
1790
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");
1791
2013
}
1792
2014
ret = rmdir(tempdir);
1793
2015
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2016
perror_plus("rmdir");
1795
2017
}
1796
2018
}
1797
2019
1802
2024
&old_sigterm_action,
1803
2025
NULL));
1804
2026
if(ret == -1){
1805
perror("sigaction");
2027
perror_plus("sigaction");
1806
2028
}
1807
2029
do {
1808
2030
ret = raise(signal_received);
1809
2031
} while(ret != 0 and errno == EINTR);
1810
2032
if(ret != 0){
1811
perror("raise");
2033
perror_plus("raise");
1812
2034
abort();
1813
2035
}
1814
2036
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0