To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 466
- compare with another revision
- download diff
- download tarball
- view history from revision 466
- Committer: Teddy Hogeborn
- Date: 2011-02-27 17:26:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20110227172635-hw1sire7k3vuo1co
Update copyright year to "2011" wherever appropriate.
- files removed:
- debian/source/local-options
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.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
program_invocation_short_name */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
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,
123
122
#define PATHDIR "/conf/conf.d/mandos"
124
123
#define SECKEY "seckey.txt"
125
124
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
127
125
128
126
bool debug = false;
129
127
static const char mandos_protocol_version[] = "1";
130
128
const char *argp_program_version = "mandos-client " VERSION;
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
132
130
static const char sys_class_net[] = "/sys/class/net";
133
131
char *connect_to = NULL;
134
132
135
/* Doubly linked list that need to be circularly linked when used */
136
typedef struct server{
137
const char *ip;
138
uint16_t port;
139
AvahiIfIndex if_index;
140
int af;
141
struct timespec last_seen;
142
struct server *next;
143
struct server *prev;
144
} server;
145
146
133
/* Used for passing in values through the Avahi callback functions */
147
134
typedef struct {
148
135
AvahiSimplePoll *simple_poll;
152
139
gnutls_dh_params_t dh_params;
153
140
const char *priority;
154
141
gpgme_ctx_t ctx;
155
server *current_server;
156
142
} mandos_context;
157
143
158
144
/* global context so signal handler can reach it*/
159
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
146
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
163
148
164
149
sig_atomic_t quit_now = 0;
165
150
int signal_received = 0;
166
151
167
/* Function to use when printing errors */
168
void perror_plus(const char *print_text){
169
fprintf(stderr, "Mandos plugin %s: ",
170
program_invocation_short_name);
171
perror(print_text);
172
}
173
174
152
/*
175
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
154
* bytes. "buffer_capacity" is how much is currently allocated,
188
166
return buffer_capacity;
189
167
}
190
168
191
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
195
int ret;
196
server *new_server = malloc(sizeof(server));
197
if(new_server == NULL){
198
perror_plus("malloc");
199
return -1;
200
}
201
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
205
if(new_server->ip == NULL){
206
perror_plus("strdup");
207
return -1;
208
}
209
/* Special case of first server */
210
if (mc.current_server == NULL){
211
new_server->next = new_server;
212
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
215
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
218
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
227
}
228
229
169
/*
230
170
* Initialize GPGME.
231
171
*/
245
185
246
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
247
187
if(fd == -1){
248
perror_plus("open");
188
perror("open");
249
189
return false;
250
190
}
251
191
265
205
266
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
267
207
if(ret == -1){
268
perror_plus("close");
208
perror("close");
269
209
}
270
210
gpgme_data_release(pgp_data);
271
211
return true;
284
224
return false;
285
225
}
286
226
287
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
288
228
rc = gpgme_get_engine_info(&engine_info);
289
229
if(rc != GPG_ERR_NO_ERROR){
290
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
396
336
397
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
398
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
399
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
400
340
plaintext_length = -1;
401
341
goto decrypt_end;
402
342
}
407
347
(size_t)plaintext_length,
408
348
plaintext_capacity);
409
349
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
350
perror("incbuffer");
411
351
plaintext_length = -1;
412
352
goto decrypt_end;
413
353
}
420
360
break;
421
361
}
422
362
if(ret < 0){
423
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
424
364
plaintext_length = -1;
425
365
goto decrypt_end;
426
366
}
483
423
}
484
424
485
425
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
487
427
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
489
432
safer_gnutls_strerror(ret));
490
433
gnutls_global_deinit();
491
434
return -1;
646
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
647
590
if(tcp_sd < 0){
648
591
int e = errno;
649
perror_plus("socket");
592
perror("socket");
650
593
errno = e;
651
594
goto mandos_end;
652
595
}
666
609
}
667
610
if(ret < 0 ){
668
611
int e = errno;
669
perror_plus("inet_pton");
612
perror("inet_pton");
670
613
errno = e;
671
614
goto mandos_end;
672
615
}
708
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
709
652
char interface[IF_NAMESIZE];
710
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
perror_plus("if_indextoname");
654
perror("if_indextoname");
712
655
} else {
713
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
657
ip, interface, port);
728
671
sizeof(addrstr));
729
672
}
730
673
if(pcret == NULL){
731
perror_plus("inet_ntop");
674
perror("inet_ntop");
732
675
} else {
733
676
if(strcmp(addrstr, ip) != 0){
734
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
749
692
if(ret < 0){
750
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
694
int e = errno;
752
perror_plus("connect");
695
perror("connect");
753
696
errno = e;
754
697
}
755
698
goto mandos_end;
768
711
out_size - written));
769
712
if(ret == -1){
770
713
int e = errno;
771
perror_plus("write");
714
perror("write");
772
715
errno = e;
773
716
goto mandos_end;
774
717
}
799
742
goto mandos_end;
800
743
}
801
744
802
/* Spurious warning from -Wint-to-pointer-cast */
803
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
804
746
805
747
if(quit_now){
842
784
buffer_capacity);
843
785
if(buffer_capacity == 0){
844
786
int e = errno;
845
perror_plus("incbuffer");
787
perror("incbuffer");
846
788
errno = e;
847
789
goto mandos_end;
848
790
}
953
895
if(e == 0){
954
896
e = errno;
955
897
}
956
perror_plus("close");
898
perror("close");
957
899
}
958
900
gnutls_deinit(session);
959
errno = e;
960
901
if(quit_now){
961
errno = EINTR;
902
e = EINTR;
962
903
retval = -1;
963
904
}
905
errno = e;
964
906
}
965
907
return retval;
966
908
}
1009
951
avahi_proto_to_af(proto));
1010
952
if(ret == 0){
1011
953
avahi_simple_poll_quit(mc.simple_poll);
1012
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1015
954
}
1016
955
}
1017
956
}
1071
1010
}
1072
1011
}
1073
1012
1074
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1075
1014
static void handle_sigterm(int sig){
1076
1015
if(quit_now){
1077
1016
return;
1079
1018
quit_now = 1;
1080
1019
signal_received = sig;
1081
1020
int old_errno = errno;
1082
/* set main loop to exit */
1083
1021
if(mc.simple_poll != NULL){
1084
1022
avahi_simple_poll_quit(mc.simple_poll);
1085
1023
}
1086
1024
errno = old_errno;
1087
1025
}
1088
1026
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
int ret;
1091
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
if(s < 0){
1094
perror_plus("socket");
1095
return false;
1096
}
1097
strcpy(ifr->ifr_name, ifname);
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
if(ret == -1){
1100
if(debug){
1101
perror_plus("ioctl SIOCGIFFLAGS");
1102
}
1103
return false;
1104
}
1105
return true;
1106
}
1107
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1110
/* Reject the loopback device */
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1115
}
1116
return false;
1117
}
1118
/* Accept point-to-point devices only if connect_to is specified */
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1123
}
1124
return true;
1125
}
1126
/* Otherwise, reject non-broadcast-capable devices */
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1131
}
1132
return false;
1133
}
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
if(ifr->ifr_flags & IFF_NOARP){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1138
}
1139
return false;
1140
}
1141
1142
/* Accept this device */
1143
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1145
}
1146
return true;
1147
}
1148
1149
1027
/*
1150
1028
* This function determines if a directory entry in /sys/class/net
1151
1029
* corresponds to an acceptable network device.
1152
1030
* (This function is passed to scandir(3) as a filter function.)
1153
1031
*/
1154
1032
int good_interface(const struct dirent *if_entry){
1155
int ret;
1156
if(if_entry->d_name[0] == '.'){
1157
return 0;
1158
}
1159
struct ifreq ifr;
1160
1161
if(not get_flags(if_entry->d_name, &ifr)){
1162
return 0;
1163
}
1164
1165
if(not good_flags(if_entry->d_name, &ifr)){
1166
return 0;
1167
}
1168
return 1;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int up_interface(const struct dirent *if_entry){
1177
1033
ssize_t ssret;
1178
1034
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1180
return 0;
1181
}
1182
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1183
1036
if_entry->d_name);
1184
1037
if(ret < 0){
1185
perror_plus("asprintf");
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1186
1042
return 0;
1187
1043
}
1188
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1189
1045
if(flags_fd == -1){
1190
perror_plus("open");
1191
free(flagname);
1046
perror("open");
1192
1047
return 0;
1193
1048
}
1194
free(flagname);
1195
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
1050
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1198
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
1053
flagstring[(size_t)to_read] = '\0';
1200
1054
if(flagstring == NULL){
1201
perror_plus("malloc");
1055
perror("malloc");
1202
1056
close(flags_fd);
1203
1057
return 0;
1204
1058
}
1206
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1207
1061
(size_t)to_read));
1208
1062
if(ssret == -1){
1209
perror_plus("read");
1063
perror("read");
1210
1064
free(flagstring);
1211
1065
close(flags_fd);
1212
1066
return 0;
1241
1095
}
1242
1096
return 0;
1243
1097
}
1244
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1247
return 0;
1248
}
1249
1250
1098
/* Accept point-to-point devices only if connect_to is specified */
1251
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1252
1100
if(debug){
1263
1111
}
1264
1112
return 0;
1265
1113
}
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
1114
/* Accept this device */
1275
1115
if(debug){
1276
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1279
1119
return 1;
1280
1120
}
1281
1121
1282
int notdotentries(const struct dirent *direntry){
1283
/* Skip "." and ".." */
1284
if(direntry->d_name[0] == '.'
1285
and (direntry->d_name[1] == '\0'
1286
or (direntry->d_name[1] == '.'
1287
and direntry->d_name[2] == '\0'))){
1288
return 0;
1289
}
1290
return 1;
1291
}
1292
1293
/* Is this directory entry a runnable program? */
1294
int runnable_hook(const struct dirent *direntry){
1295
int ret;
1296
struct stat st;
1297
1298
if((direntry->d_name)[0] == '\0'){
1299
/* Empty name? */
1300
return 0;
1301
}
1302
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1305
1306
if(*end == '~'){
1307
/* Backup name~ */
1308
return 0;
1309
}
1310
1311
if(((direntry->d_name)[0] == '#')
1312
and (*end == '#')){
1313
/* Temporary #name# */
1314
return 0;
1315
}
1316
1317
/* XXX more rules here */
1318
1319
ret = stat(direntry->d_name, &st);
1320
if(ret == -1){
1321
if(debug){
1322
perror_plus("Could not stat plugin");
1323
}
1324
return 0;
1325
}
1326
if(not (st.st_mode & S_ISREG)){
1327
/* Not a regular file */
1328
return 0;
1329
}
1330
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1331
/* Not executable */
1332
return 0;
1333
}
1334
return 1;
1335
}
1336
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1338
int ret;
1339
struct timespec now;
1340
struct timespec waited_time;
1341
intmax_t block_time;
1342
1343
while(true){
1344
if(mc.current_server == NULL){
1345
if (debug){
1346
fprintf(stderr,
1347
"Wait until first server is found. No timeout!\n");
1348
}
1349
ret = avahi_simple_poll_iterate(s, -1);
1350
} else {
1351
if (debug){
1352
fprintf(stderr, "Check current_server if we should run it,"
1353
" or wait\n");
1354
}
1355
/* the current time */
1356
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1357
if(ret == -1){
1358
perror_plus("clock_gettime");
1359
return -1;
1360
}
1361
/* Calculating in ms how long time between now and server
1362
who we visted longest time ago. Now - last seen. */
1363
waited_time.tv_sec = (now.tv_sec
1364
- mc.current_server->last_seen.tv_sec);
1365
waited_time.tv_nsec = (now.tv_nsec
1366
- mc.current_server->last_seen.tv_nsec);
1367
/* total time is 10s/10,000ms.
1368
Converting to s from ms by dividing by 1,000,
1369
and ns to ms by dividing by 1,000,000. */
1370
block_time = ((retry_interval
1371
- ((intmax_t)waited_time.tv_sec * 1000))
1372
- ((intmax_t)waited_time.tv_nsec / 1000000));
1373
1374
if (debug){
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1376
}
1377
1378
if(block_time <= 0){
1379
ret = start_mandos_communication(mc.current_server->ip,
1380
mc.current_server->port,
1381
mc.current_server->if_index,
1382
mc.current_server->af);
1383
if(ret == 0){
1384
avahi_simple_poll_quit(mc.simple_poll);
1385
return 0;
1386
}
1387
ret = clock_gettime(CLOCK_MONOTONIC,
1388
&mc.current_server->last_seen);
1389
if(ret == -1){
1390
perror_plus("clock_gettime");
1391
return -1;
1392
}
1393
mc.current_server = mc.current_server->next;
1394
block_time = 0; /* Call avahi to find new Mandos
1395
servers, but don't block */
1396
}
1397
1398
ret = avahi_simple_poll_iterate(s, (int)block_time);
1399
}
1400
if(ret != 0){
1401
if (ret > 0 or errno != EINTR) {
1402
return (ret != 1) ? ret : 0;
1403
}
1404
}
1405
}
1406
}
1407
1408
1122
int main(int argc, char *argv[]){
1409
1123
AvahiSServiceBrowser *sb = NULL;
1410
1124
int error;
1427
1141
bool gnutls_initialized = false;
1428
1142
bool gpgme_initialized = false;
1429
1143
float delay = 2.5f;
1430
double retry_interval = 10; /* 10s between trying a server and
1431
retrying the same server again */
1432
1144
1433
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1434
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1440
1152
errno = 0;
1441
1153
ret = setgid(gid);
1442
1154
if(ret == -1){
1443
perror_plus("setgid");
1155
perror("setgid");
1444
1156
}
1445
1157
1446
1158
/* Lower user privileges (temporarily) */
1447
1159
errno = 0;
1448
1160
ret = seteuid(uid);
1449
1161
if(ret == -1){
1450
perror_plus("seteuid");
1162
perror("seteuid");
1451
1163
}
1452
1164
1453
1165
if(quit_now){
1488
1200
.arg = "SECONDS",
1489
1201
.doc = "Maximum delay to wait for interface startup",
1490
1202
.group = 2 },
1491
{ .name = "retry", .key = 132,
1492
.arg = "SECONDS",
1493
.doc = "Retry interval used when denied by the mandos server",
1494
.group = 2 },
1495
1203
/*
1496
1204
* These reproduce what we would get without ARGP_NO_HELP
1497
1205
*/
1541
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1542
1250
argp_error(state, "Bad delay");
1543
1251
}
1544
case 132: /* --retry */
1545
errno = 0;
1546
retry_interval = strtod(arg, &tmp);
1547
if(errno != 0 or tmp == arg or *tmp != '\0'
1548
or (retry_interval * 1000) > INT_MAX
1549
or retry_interval < 0){
1550
argp_error(state, "Bad retry interval");
1551
}
1552
1252
break;
1553
1253
/*
1554
1254
* These reproduce what we would get without ARGP_NO_HELP
1582
1282
case ENOMEM:
1583
1283
default:
1584
1284
errno = ret;
1585
perror_plus("argp_parse");
1285
perror("argp_parse");
1586
1286
exitcode = EX_OSERR;
1587
1287
goto end;
1588
1288
case EINVAL:
1590
1290
goto end;
1591
1291
}
1592
1292
}
1593
1594
{
1595
/* Work around Debian bug #633582:
1596
<http://bugs.debian.org/633582> */
1597
struct stat st;
1598
1599
/* Re-raise priviliges */
1600
errno = 0;
1601
ret = seteuid(0);
1602
if(ret == -1){
1603
perror_plus("seteuid");
1604
}
1605
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1610
} else {
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1612
if(ret == -1){
1613
perror_plus("fstat");
1614
} else {
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1617
if(ret == -1){
1618
perror_plus("fchown");
1619
}
1620
}
1621
}
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1623
}
1624
}
1625
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1630
} else {
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1632
if(ret == -1){
1633
perror_plus("fstat");
1634
} else {
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1637
if(ret == -1){
1638
perror_plus("fchown");
1639
}
1640
}
1641
}
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1643
}
1644
}
1645
1646
/* Lower privileges */
1647
errno = 0;
1648
ret = seteuid(uid);
1649
if(ret == -1){
1650
perror_plus("seteuid");
1651
}
1652
}
1653
1654
/* Find network hooks and run them */
1655
{
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1659
alphasort);
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1665
direntry->d_name);
1666
if(ret < 0){
1667
perror_plus("asprintf");
1668
continue;
1669
}
1670
pid_t hook_pid = fork();
1671
if(hook_pid == 0){
1672
/* Child */
1673
dup2(devnull, STDIN_FILENO);
1674
close(devnull);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1682
}
1683
free(fullname);
1684
if(quit_now){
1685
goto end;
1686
}
1687
}
1688
close(devnull);
1689
}
1690
1293
1691
1294
if(not debug){
1692
1295
avahi_set_log_function(empty_log);
1693
1296
}
1694
1297
1695
1298
if(interface[0] == '\0'){
1696
1299
struct dirent **direntries;
1697
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1703
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1704
1307
}
1705
1308
if(interface == NULL){
1706
perror_plus("malloc");
1309
perror("malloc");
1707
1310
free(direntries);
1708
1311
exitcode = EXIT_FAILURE;
1709
1312
goto end;
1731
1334
sigemptyset(&sigterm_action.sa_mask);
1732
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1733
1336
if(ret == -1){
1734
perror_plus("sigaddset");
1337
perror("sigaddset");
1735
1338
exitcode = EX_OSERR;
1736
1339
goto end;
1737
1340
}
1738
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1739
1342
if(ret == -1){
1740
perror_plus("sigaddset");
1343
perror("sigaddset");
1741
1344
exitcode = EX_OSERR;
1742
1345
goto end;
1743
1346
}
1744
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1745
1348
if(ret == -1){
1746
perror_plus("sigaddset");
1349
perror("sigaddset");
1747
1350
exitcode = EX_OSERR;
1748
1351
goto end;
1749
1352
}
1753
1356
*/
1754
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1755
1358
if(ret == -1){
1756
perror_plus("sigaction");
1359
perror("sigaction");
1757
1360
return EX_OSERR;
1758
1361
}
1759
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1760
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1761
1364
if(ret == -1){
1762
perror_plus("sigaction");
1365
perror("sigaction");
1763
1366
exitcode = EX_OSERR;
1764
1367
goto end;
1765
1368
}
1766
1369
}
1767
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1768
1371
if(ret == -1){
1769
perror_plus("sigaction");
1372
perror("sigaction");
1770
1373
return EX_OSERR;
1771
1374
}
1772
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1773
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1774
1377
if(ret == -1){
1775
perror_plus("sigaction");
1378
perror("sigaction");
1776
1379
exitcode = EX_OSERR;
1777
1380
goto end;
1778
1381
}
1779
1382
}
1780
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1781
1384
if(ret == -1){
1782
perror_plus("sigaction");
1385
perror("sigaction");
1783
1386
return EX_OSERR;
1784
1387
}
1785
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1786
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1787
1390
if(ret == -1){
1788
perror_plus("sigaction");
1391
perror("sigaction");
1789
1392
exitcode = EX_OSERR;
1790
1393
goto end;
1791
1394
}
1808
1411
errno = 0;
1809
1412
ret = seteuid(0);
1810
1413
if(ret == -1){
1811
perror_plus("seteuid");
1414
perror("seteuid");
1812
1415
}
1813
1416
1814
1417
#ifdef __linux__
1818
1421
bool restore_loglevel = true;
1819
1422
if(ret == -1){
1820
1423
restore_loglevel = false;
1821
perror_plus("klogctl");
1424
perror("klogctl");
1822
1425
}
1823
1426
#endif /* __linux__ */
1824
1427
1825
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1826
1429
if(sd < 0){
1827
perror_plus("socket");
1430
perror("socket");
1828
1431
exitcode = EX_OSERR;
1829
1432
#ifdef __linux__
1830
1433
if(restore_loglevel){
1831
1434
ret = klogctl(7, NULL, 0);
1832
1435
if(ret == -1){
1833
perror_plus("klogctl");
1436
perror("klogctl");
1834
1437
}
1835
1438
}
1836
1439
#endif /* __linux__ */
1838
1441
errno = 0;
1839
1442
ret = seteuid(uid);
1840
1443
if(ret == -1){
1841
perror_plus("seteuid");
1444
perror("seteuid");
1842
1445
}
1843
1446
goto end;
1844
1447
}
1845
1448
strcpy(network.ifr_name, interface);
1846
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1847
1450
if(ret == -1){
1848
perror_plus("ioctl SIOCGIFFLAGS");
1451
perror("ioctl SIOCGIFFLAGS");
1849
1452
#ifdef __linux__
1850
1453
if(restore_loglevel){
1851
1454
ret = klogctl(7, NULL, 0);
1852
1455
if(ret == -1){
1853
perror_plus("klogctl");
1456
perror("klogctl");
1854
1457
}
1855
1458
}
1856
1459
#endif /* __linux__ */
1859
1462
errno = 0;
1860
1463
ret = seteuid(uid);
1861
1464
if(ret == -1){
1862
perror_plus("seteuid");
1465
perror("seteuid");
1863
1466
}
1864
1467
goto end;
1865
1468
}
1869
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1870
1473
if(ret == -1){
1871
1474
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1873
1476
exitcode = EX_OSERR;
1874
1477
#ifdef __linux__
1875
1478
if(restore_loglevel){
1876
1479
ret = klogctl(7, NULL, 0);
1877
1480
if(ret == -1){
1878
perror_plus("klogctl");
1481
perror("klogctl");
1879
1482
}
1880
1483
}
1881
1484
#endif /* __linux__ */
1883
1486
errno = 0;
1884
1487
ret = seteuid(uid);
1885
1488
if(ret == -1){
1886
perror_plus("seteuid");
1489
perror("seteuid");
1887
1490
}
1888
1491
goto end;
1889
1492
}
1890
1493
}
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1494
/* sleep checking until interface is running */
1893
1495
for(int i=0; i < delay * 4; i++){
1894
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1895
1497
if(ret == -1){
1896
perror_plus("ioctl SIOCGIFFLAGS");
1498
perror("ioctl SIOCGIFFLAGS");
1897
1499
} else if(network.ifr_flags & IFF_RUNNING){
1898
1500
break;
1899
1501
}
1900
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1901
1503
ret = nanosleep(&sleeptime, NULL);
1902
1504
if(ret == -1 and errno != EINTR){
1903
perror_plus("nanosleep");
1505
perror("nanosleep");
1904
1506
}
1905
1507
}
1906
1508
if(not take_down_interface){
1907
1509
/* We won't need the socket anymore */
1908
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
1511
if(ret == -1){
1910
perror_plus("close");
1512
perror("close");
1911
1513
}
1912
1514
}
1913
1515
#ifdef __linux__
1915
1517
/* Restores kernel loglevel to default */
1916
1518
ret = klogctl(7, NULL, 0);
1917
1519
if(ret == -1){
1918
perror_plus("klogctl");
1520
perror("klogctl");
1919
1521
}
1920
1522
}
1921
1523
#endif /* __linux__ */
1925
1527
/* Lower privileges */
1926
1528
ret = seteuid(uid);
1927
1529
if(ret == -1){
1928
perror_plus("seteuid");
1530
perror("seteuid");
1929
1531
}
1930
1532
} else {
1931
1533
/* Lower privileges permanently */
1932
1534
ret = setuid(uid);
1933
1535
if(ret == -1){
1934
perror_plus("setuid");
1536
perror("setuid");
1935
1537
}
1936
1538
}
1937
1539
}
1953
1555
goto end;
1954
1556
}
1955
1557
1558
tempdir_created = true;
1956
1559
if(mkdtemp(tempdir) == NULL){
1957
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
1958
1562
goto end;
1959
1563
}
1960
tempdir_created = true;
1961
1564
1962
1565
if(quit_now){
1963
1566
goto end;
2005
1608
2006
1609
port = (uint16_t)tmpmax;
2007
1610
*address = '\0';
1611
address = connect_to;
2008
1612
/* Colon in address indicates IPv6 */
2009
1613
int af;
2010
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2011
1615
af = AF_INET6;
2012
/* Accept [] around IPv6 address - see RFC 5952 */
2013
if(connect_to[0] == '[' and address[-1] == ']')
2014
{
2015
connect_to++;
2016
address[-1] = '\0';
2017
}
2018
1616
} else {
2019
1617
af = AF_INET;
2020
1618
}
2021
address = connect_to;
2022
1619
2023
1620
if(quit_now){
2024
1621
goto end;
2025
1622
}
2026
1623
2027
1624
while(not quit_now){
2028
1625
ret = start_mandos_communication(address, port, if_index, af);
2029
1626
if(quit_now or ret == 0){
2030
1627
break;
2031
1628
}
2032
if(debug){
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
2035
}
2036
sleep((int)retry_interval);
2037
}
2038
1629
sleep(15);
1630
};
1631
2039
1632
if (not quit_now){
2040
1633
exitcode = EXIT_SUCCESS;
2041
1634
}
2042
1635
2043
1636
goto end;
2044
1637
}
2045
1638
2097
1690
if(debug){
2098
1691
fprintf(stderr, "Starting Avahi loop search\n");
2099
1692
}
2100
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
2103
if(debug){
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
2106
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2107
1695
2108
1696
end:
2109
1697
2130
1718
if(gpgme_initialized){
2131
1719
gpgme_release(mc.ctx);
2132
1720
}
2133
2134
/* Cleans up the circular linked list of Mandos servers the client
2135
has seen */
2136
if(mc.current_server != NULL){
2137
mc.current_server->prev->next = NULL;
2138
while(mc.current_server != NULL){
2139
server *next = mc.current_server->next;
2140
free(mc.current_server);
2141
mc.current_server = next;
2142
}
2143
}
2144
2145
/* XXX run network hooks "stop" here */
2146
1721
2147
1722
/* Take down the network interface */
2148
1723
if(take_down_interface){
2150
1725
errno = 0;
2151
1726
ret = seteuid(0);
2152
1727
if(ret == -1){
2153
perror_plus("seteuid");
1728
perror("seteuid");
2154
1729
}
2155
1730
if(geteuid() == 0){
2156
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2157
1732
if(ret == -1){
2158
perror_plus("ioctl SIOCGIFFLAGS");
1733
perror("ioctl SIOCGIFFLAGS");
2159
1734
} else if(network.ifr_flags & IFF_UP) {
2160
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2162
1737
if(ret == -1){
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2164
1739
}
2165
1740
}
2166
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2167
1742
if(ret == -1){
2168
perror_plus("close");
1743
perror("close");
2169
1744
}
2170
1745
/* Lower privileges permanently */
2171
1746
errno = 0;
2172
1747
ret = setuid(uid);
2173
1748
if(ret == -1){
2174
perror_plus("setuid");
1749
perror("setuid");
2175
1750
}
2176
1751
}
2177
1752
}
2178
1753
2179
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2180
1755
if(tempdir_created){
2181
struct dirent **direntries = NULL;
2182
struct dirent *direntry = NULL;
2183
int numentries = scandir(tempdir, &direntries, notdotentries,
2184
alphasort);
2185
if (numentries > 0){
2186
for(int i = 0; i < numentries; i++){
2187
direntry = direntries[i];
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
}
2188
1776
char *fullname = NULL;
2189
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2190
1778
direntry->d_name);
2191
1779
if(ret < 0){
2192
perror_plus("asprintf");
1780
perror("asprintf");
2193
1781
continue;
2194
1782
}
2195
1783
ret = remove(fullname);
2199
1787
}
2200
1788
free(fullname);
2201
1789
}
2202
}
2203
2204
/* need to clean even if 0 because man page doesn't specify */
2205
free(direntries);
2206
if (numentries == -1){
2207
perror_plus("scandir");
1790
closedir(d);
2208
1791
}
2209
1792
ret = rmdir(tempdir);
2210
1793
if(ret == -1 and errno != ENOENT){
2211
perror_plus("rmdir");
1794
perror("rmdir");
2212
1795
}
2213
1796
}
2214
1797
2219
1802
&old_sigterm_action,
2220
1803
NULL));
2221
1804
if(ret == -1){
2222
perror_plus("sigaction");
1805
perror("sigaction");
2223
1806
}
2224
1807
do {
2225
1808
ret = raise(signal_received);
2226
1809
} while(ret != 0 and errno == EINTR);
2227
1810
if(ret != 0){
2228
perror_plus("raise");
1811
perror("raise");
2229
1812
abort();
2230
1813
}
2231
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0