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- Committer: Teddy Hogeborn
- Date: 2012-05-17 01:55:58 UTC
- Revision ID: teddy@recompile.se-20120517015558-5703p8nkquc2rhgd
* .bzrignore (statedir): Added.
- files added:
- network-hooks.d/openvpn
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
76
setgid(), pause(), _exit() */
77
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
90
91
91
92
#ifdef __linux__
92
93
#include <sys/klog.h> /* klogctl() */
169
170
170
171
/* Function to use when printing errors */
171
172
void perror_plus(const char *print_text){
173
int e = errno;
172
174
fprintf(stderr, "Mandos plugin %s: ",
173
175
program_invocation_short_name);
176
errno = e;
174
177
perror(print_text);
175
178
}
176
179
180
__attribute__((format (gnu_printf, 2, 3)))
177
181
int fprintf_plus(FILE *stream, const char *format, ...){
178
182
va_list ap;
179
183
va_start (ap, format);
201
205
}
202
206
203
207
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
206
210
int ret;
207
211
server *new_server = malloc(sizeof(server));
208
212
if(new_server == NULL){
209
213
perror_plus("malloc");
210
return -1;
214
return false;
211
215
}
212
216
*new_server = (server){ .ip = strdup(ip),
213
217
.port = port,
215
219
.af = af };
216
220
if(new_server->ip == NULL){
217
221
perror_plus("strdup");
218
return -1;
222
return false;
219
223
}
220
224
/* Special case of first server */
221
225
if (mc.current_server == NULL){
232
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
237
if(ret == -1){
234
238
perror_plus("clock_gettime");
235
return -1;
239
return false;
236
240
}
237
return 0;
241
return true;
238
242
}
239
243
240
244
/*
1029
1033
if(ret == 0){
1030
1034
avahi_simple_poll_quit(mc.simple_poll);
1031
1035
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
1034
1041
}
1035
1042
}
1036
1043
}
1301
1308
}
1302
1309
return 0;
1303
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1304
1315
return 1;
1305
1316
}
1306
1317
1388
1399
} else {
1389
1400
int devnull = open("/dev/null", O_RDONLY);
1390
1401
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1402
direntry = direntries[i];
1392
1403
char *fullname = NULL;
1393
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
1405
if(ret < 0){
1395
1406
perror_plus("asprintf");
1396
1407
continue;
1397
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1398
1413
pid_t hook_pid = fork();
1399
1414
if(hook_pid == 0){
1400
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1401
1440
dup2(devnull, STDIN_FILENO);
1402
1441
close(devnull);
1403
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
1444
if(ret == -1){
1406
1445
perror_plus("setenv");
1407
return false;
1446
_exit(EX_OSERR);
1408
1447
}
1409
1448
ret = setenv("DEVICE", interface, 1);
1410
1449
if(ret == -1){
1411
1450
perror_plus("setenv");
1412
return false;
1451
_exit(EX_OSERR);
1413
1452
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1415
1454
if(ret == -1){
1416
1455
perror_plus("setenv");
1417
return false;
1456
_exit(EX_OSERR);
1418
1457
}
1419
1458
ret = setenv("MODE", mode, 1);
1420
1459
if(ret == -1){
1421
1460
perror_plus("setenv");
1422
return false;
1461
_exit(EX_OSERR);
1423
1462
}
1424
1463
char *delaystring;
1425
1464
ret = asprintf(&delaystring, "%f", delay);
1426
1465
if(ret == -1){
1427
1466
perror_plus("asprintf");
1428
return false;
1467
_exit(EX_OSERR);
1429
1468
}
1430
1469
ret = setenv("DELAY", delaystring, 1);
1431
1470
if(ret == -1){
1432
1471
free(delaystring);
1433
1472
perror_plus("setenv");
1434
return false;
1473
_exit(EX_OSERR);
1435
1474
}
1436
1475
free(delaystring);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1439
1487
} else {
1440
1488
int status;
1441
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1465
1513
}
1466
1514
}
1467
1515
free(fullname);
1468
if(quit_now){
1469
break;
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1470
1519
}
1471
1520
}
1472
1521
close(devnull);
1559
1608
.group = 2 },
1560
1609
{ .name = "retry", .key = 132,
1561
1610
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
1611
.doc = "Retry interval used when denied by the Mandos server",
1563
1612
.group = 2 },
1564
1613
{ .name = "network-hook-dir", .key = 133,
1565
1614
.arg = "DIR",
1637
1686
argp_state_help(state, state->out_stream,
1638
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
1688
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
1690
exit(argp_err_exit_status);
1644
1691
break;
1672
1719
{
1673
1720
/* Work around Debian bug #633582:
1674
1721
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1722
1677
1723
/* Re-raise priviliges */
1678
1724
errno = 0;
1679
1725
ret = seteuid(0);
1680
1726
if(ret == -1){
1681
1727
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1731
1779
}
1732
1780
}
1733
1781
1734
1782
/* Run network hooks */
1735
{
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1751
1785
}
1752
1786
1753
1787
if(not debug){
2192
2226
if(gpgme_initialized){
2193
2227
gpgme_release(mc.ctx);
2194
2228
}
2195
2229
2196
2230
/* Cleans up the circular linked list of Mandos servers the client
2197
2231
has seen */
2198
2232
if(mc.current_server != NULL){
2204
2238
}
2205
2239
}
2206
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2207
2244
/* Re-raise priviliges */
2208
2245
{
2209
2246
errno = 0;
2211
2248
if(ret == -1){
2212
2249
perror_plus("seteuid");
2213
2250
}
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2218
2251
2219
2252
/* Take down the network interface */
2220
2253
if(take_down_interface and geteuid() == 0){
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