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 406
- compare with another revision
- download diff
- download tarball
- view history from revision 406
- Committer: Teddy Hogeborn
- Date: 2009-11-09 07:35:16 UTC
- Revision ID: teddy@fukt.bsnet.se-20091109073516-v1vem352uz0vuwrd
* dbus-mandos.conf: New; to be copied to
"/etc/dbus-1/system.d/mandos.conf".
"/etc/dbus-1/system.d/mandos.conf".
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
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 */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
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>";
132
static const char sys_class_net[] = "/sys/class/net";
133
char *connect_to = NULL;
134
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;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
145
130
146
131
/* Used for passing in values through the Avahi callback functions */
147
132
typedef struct {
152
137
gnutls_dh_params_t dh_params;
153
138
const char *priority;
154
139
gpgme_ctx_t ctx;
155
server *current_server;
156
140
} mandos_context;
157
141
158
142
/* global context so signal handler can reach it*/
159
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
144
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
163
146
164
147
sig_atomic_t quit_now = 0;
165
148
int signal_received = 0;
166
149
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
int fprintf_plus(FILE *stream, const char *format, ...){
175
va_list ap;
176
va_start (ap, format);
177
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
179
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
180
}
181
182
150
/*
183
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
184
152
* bytes. "buffer_capacity" is how much is currently allocated,
196
164
return buffer_capacity;
197
165
}
198
166
199
/* Add server to set of servers to retry periodically */
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
int af){
203
int ret;
204
server *new_server = malloc(sizeof(server));
205
if(new_server == NULL){
206
perror_plus("malloc");
207
return -1;
208
}
209
*new_server = (server){ .ip = strdup(ip),
210
.port = port,
211
.if_index = if_index,
212
.af = af };
213
if(new_server->ip == NULL){
214
perror_plus("strdup");
215
return -1;
216
}
217
/* Special case of first server */
218
if (mc.current_server == NULL){
219
new_server->next = new_server;
220
new_server->prev = new_server;
221
mc.current_server = new_server;
222
/* Place the new server last in the list */
223
} else {
224
new_server->next = mc.current_server;
225
new_server->prev = mc.current_server->prev;
226
new_server->prev->next = new_server;
227
mc.current_server->prev = new_server;
228
}
229
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
if(ret == -1){
231
perror_plus("clock_gettime");
232
return -1;
233
}
234
return 0;
235
}
236
237
167
/*
238
168
* Initialize GPGME.
239
169
*/
253
183
254
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
255
185
if(fd == -1){
256
perror_plus("open");
186
perror("open");
257
187
return false;
258
188
}
259
189
273
203
274
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
275
205
if(ret == -1){
276
perror_plus("close");
206
perror("close");
277
207
}
278
208
gpgme_data_release(pgp_data);
279
209
return true;
292
222
return false;
293
223
}
294
224
295
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
296
226
rc = gpgme_get_engine_info(&engine_info);
297
227
if(rc != GPG_ERR_NO_ERROR){
298
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
404
334
405
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
406
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
407
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
408
338
plaintext_length = -1;
409
339
goto decrypt_end;
410
340
}
415
345
(size_t)plaintext_length,
416
346
plaintext_capacity);
417
347
if(plaintext_capacity == 0){
418
perror_plus("incbuffer");
348
perror("incbuffer");
419
349
plaintext_length = -1;
420
350
goto decrypt_end;
421
351
}
428
358
break;
429
359
}
430
360
if(ret < 0){
431
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
432
362
plaintext_length = -1;
433
363
goto decrypt_end;
434
364
}
491
421
}
492
422
493
423
/* OpenPGP credentials */
494
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
495
425
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "GnuTLS memory error: %s\n",
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
497
430
safer_gnutls_strerror(ret));
498
431
gnutls_global_deinit();
499
432
return -1;
654
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
655
588
if(tcp_sd < 0){
656
589
int e = errno;
657
perror_plus("socket");
590
perror("socket");
658
591
errno = e;
659
592
goto mandos_end;
660
593
}
674
607
}
675
608
if(ret < 0 ){
676
609
int e = errno;
677
perror_plus("inet_pton");
610
perror("inet_pton");
678
611
errno = e;
679
612
goto mandos_end;
680
613
}
716
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
717
650
char interface[IF_NAMESIZE];
718
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
perror_plus("if_indextoname");
652
perror("if_indextoname");
720
653
} else {
721
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
655
ip, interface, port);
736
669
sizeof(addrstr));
737
670
}
738
671
if(pcret == NULL){
739
perror_plus("inet_ntop");
672
perror("inet_ntop");
740
673
} else {
741
674
if(strcmp(addrstr, ip) != 0){
742
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
755
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
756
689
}
757
690
if(ret < 0){
758
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
759
int e = errno;
760
perror_plus("connect");
761
errno = e;
762
}
691
int e = errno;
692
perror("connect");
693
errno = e;
763
694
goto mandos_end;
764
695
}
765
696
776
707
out_size - written));
777
708
if(ret == -1){
778
709
int e = errno;
779
perror_plus("write");
710
perror("write");
780
711
errno = e;
781
712
goto mandos_end;
782
713
}
807
738
goto mandos_end;
808
739
}
809
740
810
/* Spurious warning from -Wint-to-pointer-cast */
811
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
812
742
813
743
if(quit_now){
850
780
buffer_capacity);
851
781
if(buffer_capacity == 0){
852
782
int e = errno;
853
perror_plus("incbuffer");
783
perror("incbuffer");
854
784
errno = e;
855
785
goto mandos_end;
856
786
}
961
891
if(e == 0){
962
892
e = errno;
963
893
}
964
perror_plus("close");
894
perror("close");
965
895
}
966
896
gnutls_deinit(session);
967
errno = e;
968
897
if(quit_now){
969
errno = EINTR;
898
e = EINTR;
970
899
retval = -1;
971
900
}
901
errno = e;
972
902
}
973
903
return retval;
974
904
}
1017
947
avahi_proto_to_af(proto));
1018
948
if(ret == 0){
1019
949
avahi_simple_poll_quit(mc.simple_poll);
1020
} else {
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
1023
950
}
1024
951
}
1025
952
}
1079
1006
}
1080
1007
}
1081
1008
1082
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1083
1010
static void handle_sigterm(int sig){
1084
1011
if(quit_now){
1085
1012
return;
1087
1014
quit_now = 1;
1088
1015
signal_received = sig;
1089
1016
int old_errno = errno;
1090
/* set main loop to exit */
1091
1017
if(mc.simple_poll != NULL){
1092
1018
avahi_simple_poll_quit(mc.simple_poll);
1093
1019
}
1094
1020
errno = old_errno;
1095
1021
}
1096
1022
1097
bool get_flags(const char *ifname, struct ifreq *ifr){
1098
int ret;
1099
1100
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1101
if(s < 0){
1102
perror_plus("socket");
1103
return false;
1104
}
1105
strcpy(ifr->ifr_name, ifname);
1106
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1107
if(ret == -1){
1108
if(debug){
1109
perror_plus("ioctl SIOCGIFFLAGS");
1110
}
1111
return false;
1112
}
1113
return true;
1114
}
1115
1116
bool good_flags(const char *ifname, const struct ifreq *ifr){
1117
1118
/* Reject the loopback device */
1119
if(ifr->ifr_flags & IFF_LOOPBACK){
1120
if(debug){
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1123
}
1124
return false;
1125
}
1126
/* Accept point-to-point devices only if connect_to is specified */
1127
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1128
if(debug){
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1131
}
1132
return true;
1133
}
1134
/* Otherwise, reject non-broadcast-capable devices */
1135
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1139
}
1140
return false;
1141
}
1142
/* Reject non-ARP interfaces (including dummy interfaces) */
1143
if(ifr->ifr_flags & IFF_NOARP){
1144
if(debug){
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1146
}
1147
return false;
1148
}
1149
1150
/* Accept this device */
1151
if(debug){
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1153
}
1154
return true;
1155
}
1156
1157
/*
1158
* This function determines if a directory entry in /sys/class/net
1159
* corresponds to an acceptable network device.
1160
* (This function is passed to scandir(3) as a filter function.)
1161
*/
1162
int good_interface(const struct dirent *if_entry){
1163
int ret;
1164
if(if_entry->d_name[0] == '.'){
1165
return 0;
1166
}
1167
struct ifreq ifr;
1168
1169
if(not get_flags(if_entry->d_name, &ifr)){
1170
return 0;
1171
}
1172
1173
if(not good_flags(if_entry->d_name, &ifr)){
1174
return 0;
1175
}
1176
return 1;
1177
}
1178
1179
/*
1180
* This function determines if a directory entry in /sys/class/net
1181
* corresponds to an acceptable network device which is up.
1182
* (This function is passed to scandir(3) as a filter function.)
1183
*/
1184
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1256
}
1257
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1286
}
1287
return 1;
1288
}
1289
1290
int notdotentries(const struct dirent *direntry){
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
1296
return 0;
1297
}
1298
return 1;
1299
}
1300
1301
/* Is this directory entry a runnable program? */
1302
int runnable_hook(const struct dirent *direntry){
1303
int ret;
1304
struct stat st;
1305
1306
if((direntry->d_name)[0] == '\0'){
1307
/* Empty name? */
1308
return 0;
1309
}
1310
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
1328
if(ret == -1){
1329
if(debug){
1330
perror_plus("Could not stat plugin");
1331
}
1332
return 0;
1333
}
1334
if(not (st.st_mode & S_ISREG)){
1335
/* Not a regular file */
1336
return 0;
1337
}
1338
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1339
/* Not executable */
1340
return 0;
1341
}
1342
return 1;
1343
}
1344
1345
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1346
int ret;
1347
struct timespec now;
1348
struct timespec waited_time;
1349
intmax_t block_time;
1350
1351
while(true){
1352
if(mc.current_server == NULL){
1353
if (debug){
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1356
}
1357
ret = avahi_simple_poll_iterate(s, -1);
1358
} else {
1359
if (debug){
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1362
}
1363
/* the current time */
1364
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
/* Calculating in ms how long time between now and server
1370
who we visted longest time ago. Now - last seen. */
1371
waited_time.tv_sec = (now.tv_sec
1372
- mc.current_server->last_seen.tv_sec);
1373
waited_time.tv_nsec = (now.tv_nsec
1374
- mc.current_server->last_seen.tv_nsec);
1375
/* total time is 10s/10,000ms.
1376
Converting to s from ms by dividing by 1,000,
1377
and ns to ms by dividing by 1,000,000. */
1378
block_time = ((retry_interval
1379
- ((intmax_t)waited_time.tv_sec * 1000))
1380
- ((intmax_t)waited_time.tv_nsec / 1000000));
1381
1382
if (debug){
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1384
}
1385
1386
if(block_time <= 0){
1387
ret = start_mandos_communication(mc.current_server->ip,
1388
mc.current_server->port,
1389
mc.current_server->if_index,
1390
mc.current_server->af);
1391
if(ret == 0){
1392
avahi_simple_poll_quit(mc.simple_poll);
1393
return 0;
1394
}
1395
ret = clock_gettime(CLOCK_MONOTONIC,
1396
&mc.current_server->last_seen);
1397
if(ret == -1){
1398
perror_plus("clock_gettime");
1399
return -1;
1400
}
1401
mc.current_server = mc.current_server->next;
1402
block_time = 0; /* Call avahi to find new Mandos
1403
servers, but don't block */
1404
}
1405
1406
ret = avahi_simple_poll_iterate(s, (int)block_time);
1407
}
1408
if(ret != 0){
1409
if (ret > 0 or errno != EINTR) {
1410
return (ret != 1) ? ret : 0;
1411
}
1412
}
1413
}
1414
}
1415
1416
1023
int main(int argc, char *argv[]){
1417
1024
AvahiSServiceBrowser *sb = NULL;
1418
1025
int error;
1420
1027
intmax_t tmpmax;
1421
1028
char *tmp;
1422
1029
int exitcode = EXIT_SUCCESS;
1423
const char *interface = "";
1030
const char *interface = "eth0";
1424
1031
struct ifreq network;
1425
1032
int sd = -1;
1426
1033
bool take_down_interface = false;
1427
1034
uid_t uid;
1428
1035
gid_t gid;
1036
char *connect_to = NULL;
1429
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1430
1038
bool tempdir_created = false;
1431
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1435
1043
bool gnutls_initialized = false;
1436
1044
bool gpgme_initialized = false;
1437
1045
float delay = 2.5f;
1438
double retry_interval = 10; /* 10s between trying a server and
1439
retrying the same server again */
1440
1046
1441
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1442
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1448
1054
errno = 0;
1449
1055
ret = setgid(gid);
1450
1056
if(ret == -1){
1451
perror_plus("setgid");
1057
perror("setgid");
1452
1058
}
1453
1059
1454
1060
/* Lower user privileges (temporarily) */
1455
1061
errno = 0;
1456
1062
ret = seteuid(uid);
1457
1063
if(ret == -1){
1458
perror_plus("seteuid");
1064
perror("seteuid");
1459
1065
}
1460
1066
1461
1067
if(quit_now){
1496
1102
.arg = "SECONDS",
1497
1103
.doc = "Maximum delay to wait for interface startup",
1498
1104
.group = 2 },
1499
{ .name = "retry", .key = 132,
1500
.arg = "SECONDS",
1501
.doc = "Retry interval used when denied by the mandos server",
1502
.group = 2 },
1503
1105
/*
1504
1106
* These reproduce what we would get without ARGP_NO_HELP
1505
1107
*/
1549
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1550
1152
argp_error(state, "Bad delay");
1551
1153
}
1552
case 132: /* --retry */
1553
errno = 0;
1554
retry_interval = strtod(arg, &tmp);
1555
if(errno != 0 or tmp == arg or *tmp != '\0'
1556
or (retry_interval * 1000) > INT_MAX
1557
or retry_interval < 0){
1558
argp_error(state, "Bad retry interval");
1559
}
1560
1154
break;
1561
1155
/*
1562
1156
* These reproduce what we would get without ARGP_NO_HELP
1590
1184
case ENOMEM:
1591
1185
default:
1592
1186
errno = ret;
1593
perror_plus("argp_parse");
1187
perror("argp_parse");
1594
1188
exitcode = EX_OSERR;
1595
1189
goto end;
1596
1190
case EINVAL:
1598
1192
goto end;
1599
1193
}
1600
1194
}
1601
1602
{
1603
/* Work around Debian bug #633582:
1604
<http://bugs.debian.org/633582> */
1605
struct stat st;
1606
1607
/* Re-raise priviliges */
1608
errno = 0;
1609
ret = seteuid(0);
1610
if(ret == -1){
1611
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1659
}
1660
}
1661
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
1693
goto end;
1694
}
1695
}
1696
close(devnull);
1697
}
1698
1195
1699
1196
if(not debug){
1700
1197
avahi_set_log_function(empty_log);
1701
1198
}
1702
1199
1703
if(interface[0] == '\0'){
1704
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1706
alphasort);
1707
if(ret >= 1){
1708
/* Pick the first good interface */
1709
interface = strdup(direntries[0]->d_name);
1710
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1712
}
1713
if(interface == NULL){
1714
perror_plus("malloc");
1715
free(direntries);
1716
exitcode = EXIT_FAILURE;
1717
goto end;
1718
}
1719
free(direntries);
1720
} else {
1721
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1723
exitcode = EXIT_FAILURE;
1724
goto end;
1725
}
1726
}
1727
1728
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1729
1201
from the signal handler */
1730
1202
/* Initialize the pseudo-RNG for Avahi */
1739
1211
sigemptyset(&sigterm_action.sa_mask);
1740
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1741
1213
if(ret == -1){
1742
perror_plus("sigaddset");
1214
perror("sigaddset");
1743
1215
exitcode = EX_OSERR;
1744
1216
goto end;
1745
1217
}
1746
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1747
1219
if(ret == -1){
1748
perror_plus("sigaddset");
1220
perror("sigaddset");
1749
1221
exitcode = EX_OSERR;
1750
1222
goto end;
1751
1223
}
1752
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1753
1225
if(ret == -1){
1754
perror_plus("sigaddset");
1226
perror("sigaddset");
1755
1227
exitcode = EX_OSERR;
1756
1228
goto end;
1757
1229
}
1761
1233
*/
1762
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1763
1235
if(ret == -1){
1764
perror_plus("sigaction");
1236
perror("sigaction");
1765
1237
return EX_OSERR;
1766
1238
}
1767
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1768
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1769
1241
if(ret == -1){
1770
perror_plus("sigaction");
1242
perror("sigaction");
1771
1243
exitcode = EX_OSERR;
1772
1244
goto end;
1773
1245
}
1774
1246
}
1775
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1776
1248
if(ret == -1){
1777
perror_plus("sigaction");
1249
perror("sigaction");
1778
1250
return EX_OSERR;
1779
1251
}
1780
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1781
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1782
1254
if(ret == -1){
1783
perror_plus("sigaction");
1255
perror("sigaction");
1784
1256
exitcode = EX_OSERR;
1785
1257
goto end;
1786
1258
}
1787
1259
}
1788
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1789
1261
if(ret == -1){
1790
perror_plus("sigaction");
1262
perror("sigaction");
1791
1263
return EX_OSERR;
1792
1264
}
1793
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1794
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1795
1267
if(ret == -1){
1796
perror_plus("sigaction");
1268
perror("sigaction");
1797
1269
exitcode = EX_OSERR;
1798
1270
goto end;
1799
1271
}
1800
1272
}
1801
1273
1802
1274
/* If the interface is down, bring it up */
1803
if(strcmp(interface, "none") != 0){
1275
if(interface[0] != '\0'){
1804
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1805
1277
if(if_index == 0){
1806
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1816
1288
errno = 0;
1817
1289
ret = seteuid(0);
1818
1290
if(ret == -1){
1819
perror_plus("seteuid");
1291
perror("seteuid");
1820
1292
}
1821
1293
1822
1294
#ifdef __linux__
1826
1298
bool restore_loglevel = true;
1827
1299
if(ret == -1){
1828
1300
restore_loglevel = false;
1829
perror_plus("klogctl");
1301
perror("klogctl");
1830
1302
}
1831
1303
#endif /* __linux__ */
1832
1304
1833
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1834
1306
if(sd < 0){
1835
perror_plus("socket");
1307
perror("socket");
1836
1308
exitcode = EX_OSERR;
1837
1309
#ifdef __linux__
1838
1310
if(restore_loglevel){
1839
1311
ret = klogctl(7, NULL, 0);
1840
1312
if(ret == -1){
1841
perror_plus("klogctl");
1313
perror("klogctl");
1842
1314
}
1843
1315
}
1844
1316
#endif /* __linux__ */
1846
1318
errno = 0;
1847
1319
ret = seteuid(uid);
1848
1320
if(ret == -1){
1849
perror_plus("seteuid");
1321
perror("seteuid");
1850
1322
}
1851
1323
goto end;
1852
1324
}
1853
1325
strcpy(network.ifr_name, interface);
1854
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1855
1327
if(ret == -1){
1856
perror_plus("ioctl SIOCGIFFLAGS");
1328
perror("ioctl SIOCGIFFLAGS");
1857
1329
#ifdef __linux__
1858
1330
if(restore_loglevel){
1859
1331
ret = klogctl(7, NULL, 0);
1860
1332
if(ret == -1){
1861
perror_plus("klogctl");
1333
perror("klogctl");
1862
1334
}
1863
1335
}
1864
1336
#endif /* __linux__ */
1867
1339
errno = 0;
1868
1340
ret = seteuid(uid);
1869
1341
if(ret == -1){
1870
perror_plus("seteuid");
1342
perror("seteuid");
1871
1343
}
1872
1344
goto end;
1873
1345
}
1877
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1878
1350
if(ret == -1){
1879
1351
take_down_interface = false;
1880
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1352
perror("ioctl SIOCSIFFLAGS");
1881
1353
exitcode = EX_OSERR;
1882
1354
#ifdef __linux__
1883
1355
if(restore_loglevel){
1884
1356
ret = klogctl(7, NULL, 0);
1885
1357
if(ret == -1){
1886
perror_plus("klogctl");
1358
perror("klogctl");
1887
1359
}
1888
1360
}
1889
1361
#endif /* __linux__ */
1891
1363
errno = 0;
1892
1364
ret = seteuid(uid);
1893
1365
if(ret == -1){
1894
perror_plus("seteuid");
1366
perror("seteuid");
1895
1367
}
1896
1368
goto end;
1897
1369
}
1898
1370
}
1899
/* Sleep checking until interface is running.
1900
Check every 0.25s, up to total time of delay */
1371
/* sleep checking until interface is running */
1901
1372
for(int i=0; i < delay * 4; i++){
1902
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1903
1374
if(ret == -1){
1904
perror_plus("ioctl SIOCGIFFLAGS");
1375
perror("ioctl SIOCGIFFLAGS");
1905
1376
} else if(network.ifr_flags & IFF_RUNNING){
1906
1377
break;
1907
1378
}
1908
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1909
1380
ret = nanosleep(&sleeptime, NULL);
1910
1381
if(ret == -1 and errno != EINTR){
1911
perror_plus("nanosleep");
1382
perror("nanosleep");
1912
1383
}
1913
1384
}
1914
1385
if(not take_down_interface){
1915
1386
/* We won't need the socket anymore */
1916
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1917
1388
if(ret == -1){
1918
perror_plus("close");
1389
perror("close");
1919
1390
}
1920
1391
}
1921
1392
#ifdef __linux__
1923
1394
/* Restores kernel loglevel to default */
1924
1395
ret = klogctl(7, NULL, 0);
1925
1396
if(ret == -1){
1926
perror_plus("klogctl");
1397
perror("klogctl");
1927
1398
}
1928
1399
}
1929
1400
#endif /* __linux__ */
1933
1404
/* Lower privileges */
1934
1405
ret = seteuid(uid);
1935
1406
if(ret == -1){
1936
perror_plus("seteuid");
1407
perror("seteuid");
1937
1408
}
1938
1409
} else {
1939
1410
/* Lower privileges permanently */
1940
1411
ret = setuid(uid);
1941
1412
if(ret == -1){
1942
perror_plus("setuid");
1413
perror("setuid");
1943
1414
}
1944
1415
}
1945
1416
}
1961
1432
goto end;
1962
1433
}
1963
1434
1435
tempdir_created = true;
1964
1436
if(mkdtemp(tempdir) == NULL){
1965
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
1966
1439
goto end;
1967
1440
}
1968
tempdir_created = true;
1969
1441
1970
1442
if(quit_now){
1971
1443
goto end;
2013
1485
2014
1486
port = (uint16_t)tmpmax;
2015
1487
*address = '\0';
1488
address = connect_to;
2016
1489
/* Colon in address indicates IPv6 */
2017
1490
int af;
2018
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2019
1492
af = AF_INET6;
2020
/* Accept [] around IPv6 address - see RFC 5952 */
2021
if(connect_to[0] == '[' and address[-1] == ']')
2022
{
2023
connect_to++;
2024
address[-1] = '\0';
2025
}
2026
1493
} else {
2027
1494
af = AF_INET;
2028
1495
}
2029
address = connect_to;
2030
1496
2031
1497
if(quit_now){
2032
1498
goto end;
2033
1499
}
2034
1500
2035
while(not quit_now){
2036
ret = start_mandos_communication(address, port, if_index, af);
2037
if(quit_now or ret == 0){
2038
break;
2039
}
2040
if(debug){
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2043
}
2044
sleep((int)retry_interval);
2045
}
2046
2047
if (not quit_now){
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2048
1523
exitcode = EXIT_SUCCESS;
2049
1524
}
2050
2051
1525
goto end;
2052
1526
}
2053
1527
2105
1579
if(debug){
2106
1580
fprintf(stderr, "Starting Avahi loop search\n");
2107
1581
}
2108
2109
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
(int)(retry_interval * 1000));
2111
if(debug){
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2114
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2115
1584
2116
1585
end:
2117
1586
2138
1607
if(gpgme_initialized){
2139
1608
gpgme_release(mc.ctx);
2140
1609
}
2141
2142
/* Cleans up the circular linked list of Mandos servers the client
2143
has seen */
2144
if(mc.current_server != NULL){
2145
mc.current_server->prev->next = NULL;
2146
while(mc.current_server != NULL){
2147
server *next = mc.current_server->next;
2148
free(mc.current_server);
2149
mc.current_server = next;
2150
}
2151
}
2152
2153
/* XXX run network hooks "stop" here */
2154
1610
2155
1611
/* Take down the network interface */
2156
1612
if(take_down_interface){
2158
1614
errno = 0;
2159
1615
ret = seteuid(0);
2160
1616
if(ret == -1){
2161
perror_plus("seteuid");
1617
perror("seteuid");
2162
1618
}
2163
1619
if(geteuid() == 0){
2164
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
1621
if(ret == -1){
2166
perror_plus("ioctl SIOCGIFFLAGS");
1622
perror("ioctl SIOCGIFFLAGS");
2167
1623
} else if(network.ifr_flags & IFF_UP) {
2168
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
1626
if(ret == -1){
2171
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1627
perror("ioctl SIOCSIFFLAGS");
2172
1628
}
2173
1629
}
2174
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2175
1631
if(ret == -1){
2176
perror_plus("close");
1632
perror("close");
2177
1633
}
2178
1634
/* Lower privileges permanently */
2179
1635
errno = 0;
2180
1636
ret = setuid(uid);
2181
1637
if(ret == -1){
2182
perror_plus("setuid");
1638
perror("setuid");
2183
1639
}
2184
1640
}
2185
1641
}
2186
1642
2187
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2188
1644
if(tempdir_created){
2189
struct dirent **direntries = NULL;
2190
struct dirent *direntry = NULL;
2191
int numentries = scandir(tempdir, &direntries, notdotentries,
2192
alphasort);
2193
if (numentries > 0){
2194
for(int i = 0; i < numentries; i++){
2195
direntry = direntries[i];
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2196
1665
char *fullname = NULL;
2197
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2198
1667
direntry->d_name);
2199
1668
if(ret < 0){
2200
perror_plus("asprintf");
1669
perror("asprintf");
2201
1670
continue;
2202
1671
}
2203
1672
ret = remove(fullname);
2207
1676
}
2208
1677
free(fullname);
2209
1678
}
2210
}
2211
2212
/* need to clean even if 0 because man page doesn't specify */
2213
free(direntries);
2214
if (numentries == -1){
2215
perror_plus("scandir");
1679
closedir(d);
2216
1680
}
2217
1681
ret = rmdir(tempdir);
2218
1682
if(ret == -1 and errno != ENOENT){
2219
perror_plus("rmdir");
1683
perror("rmdir");
2220
1684
}
2221
1685
}
2222
1686
2227
1691
&old_sigterm_action,
2228
1692
NULL));
2229
1693
if(ret == -1){
2230
perror_plus("sigaction");
1694
perror("sigaction");
2231
1695
}
2232
1696
do {
2233
1697
ret = raise(signal_received);
2234
1698
} while(ret != 0 and errno == EINTR);
2235
1699
if(ret != 0){
2236
perror_plus("raise");
1700
perror("raise");
2237
1701
abort();
2238
1702
}
2239
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0