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- Committer: Teddy Hogeborn
- Date: 2012-06-14 21:42:44 UTC
- Revision ID: teddy@recompile.se-20120614214244-meh2hr7pg0p0fek2
* plugins.d/mandos-client.c: Only print message about nonexisting
network hook directory in debug mode.
network hook directory in debug mode.
- files added:
- debian/mandos-client.examples
- 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
75
setgid(), pause(), _exit() */
77
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
90
94
91
95
#ifdef __linux__
92
96
#include <sys/klog.h> /* klogctl() */
134
138
static const char sys_class_net[] = "/sys/class/net";
135
139
char *connect_to = NULL;
136
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
137
143
138
144
/* Doubly linked list that need to be circularly linked when used */
139
145
typedef struct server{
140
146
const char *ip;
141
uint16_t port;
147
in_port_t port;
142
148
AvahiIfIndex if_index;
143
149
int af;
144
150
struct timespec last_seen;
169
175
170
176
/* Function to use when printing errors */
171
177
void perror_plus(const char *print_text){
178
int e = errno;
172
179
fprintf(stderr, "Mandos plugin %s: ",
173
180
program_invocation_short_name);
181
errno = e;
174
182
perror(print_text);
175
183
}
176
184
185
__attribute__((format (gnu_printf, 2, 3)))
177
186
int fprintf_plus(FILE *stream, const char *format, ...){
178
187
va_list ap;
179
188
va_start (ap, format);
201
210
}
202
211
203
212
/* 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){
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
206
215
int ret;
207
216
server *new_server = malloc(sizeof(server));
208
217
if(new_server == NULL){
209
218
perror_plus("malloc");
210
return -1;
219
return false;
211
220
}
212
221
*new_server = (server){ .ip = strdup(ip),
213
222
.port = port,
215
224
.af = af };
216
225
if(new_server->ip == NULL){
217
226
perror_plus("strdup");
218
return -1;
227
return false;
219
228
}
220
229
/* Special case of first server */
221
230
if (mc.current_server == NULL){
232
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
242
if(ret == -1){
234
243
perror_plus("clock_gettime");
235
return -1;
244
return false;
236
245
}
237
return 0;
246
return true;
238
247
}
239
248
240
249
/*
461
470
}
462
471
463
472
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
473
const char *ret = gnutls_strerror(value);
466
474
if(ret == NULL)
467
475
ret = "(unknown)";
468
476
return ret;
613
621
__attribute__((unused)) const char *txt){}
614
622
615
623
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
617
625
AvahiIfIndex if_index,
618
626
int af){
619
627
int ret, tcp_sd = -1;
658
666
659
667
if(debug){
660
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
669
PRIuMAX "\n", ip, (uintmax_t)port);
662
670
}
663
671
664
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
695
703
goto mandos_end;
696
704
}
697
705
if(af == AF_INET6){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
706
to.in6.sin6_port = htons(port);
702
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
709
-Wunreachable-code*/
728
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
734
perror_plus("if_indextoname");
730
735
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
733
738
}
734
739
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
737
742
}
738
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
817
822
goto mandos_end;
818
823
}
819
824
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
830
823
831
if(quit_now){
824
832
errno = EINTR;
997
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1006
flags,
999
1007
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1008
if(r == NULL){
1009
return;
1010
}
1001
1011
1002
1012
/* Called whenever a service has been resolved successfully or
1003
1013
timed out */
1024
1034
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1035
host_name, ip, (intmax_t)interface, port);
1026
1036
}
1027
int ret = start_mandos_communication(ip, port, interface,
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
1028
1039
avahi_proto_to_af(proto));
1029
1040
if(ret == 0){
1030
1041
avahi_simple_poll_quit(mc.simple_poll);
1031
1042
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
" list\n", name);
1047
}
1034
1048
}
1035
1049
}
1036
1050
}
1047
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1062
flags,
1049
1063
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1064
if(b == NULL){
1065
return;
1066
}
1051
1067
1052
1068
/* Called whenever a new services becomes available on the LAN or
1053
1069
is removed from the LAN */
1109
1125
1110
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1127
int ret;
1128
error_t ret_errno;
1112
1129
1113
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1131
if(s < 0){
1132
ret_errno = errno;
1115
1133
perror_plus("socket");
1134
errno = ret_errno;
1116
1135
return false;
1117
1136
}
1118
1137
strcpy(ifr->ifr_name, ifname);
1119
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1139
if(ret == -1){
1121
1140
if(debug){
1141
ret_errno = errno;
1122
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1123
1144
}
1124
1145
return false;
1125
1146
}
1194
1215
}
1195
1216
1196
1217
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1237
1247
}
1238
1248
1239
1249
int notdotentries(const struct dirent *direntry){
1301
1311
}
1302
1312
return 0;
1303
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1304
1318
return 1;
1305
1319
}
1306
1320
1376
1390
}
1377
1391
}
1378
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1379
1445
bool run_network_hooks(const char *mode, const char *interface,
1380
1446
const float delay){
1381
1447
struct dirent **direntries;
1384
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
1451
alphasort);
1386
1452
if(numhooks == -1){
1387
perror_plus("scandir");
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1460
}
1388
1461
} else {
1389
1462
int devnull = open("/dev/null", O_RDONLY);
1390
1463
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1464
direntry = direntries[i];
1392
1465
char *fullname = NULL;
1393
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
1467
if(ret < 0){
1395
1468
perror_plus("asprintf");
1396
1469
continue;
1397
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1398
1475
pid_t hook_pid = fork();
1399
1476
if(hook_pid == 0){
1400
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1401
1492
dup2(devnull, STDIN_FILENO);
1402
1493
close(devnull);
1403
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
1496
if(ret == -1){
1406
1497
perror_plus("setenv");
1407
return false;
1498
_exit(EX_OSERR);
1408
1499
}
1409
1500
ret = setenv("DEVICE", interface, 1);
1410
1501
if(ret == -1){
1411
1502
perror_plus("setenv");
1412
return false;
1503
_exit(EX_OSERR);
1413
1504
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1415
1506
if(ret == -1){
1416
1507
perror_plus("setenv");
1417
return false;
1508
_exit(EX_OSERR);
1418
1509
}
1419
1510
ret = setenv("MODE", mode, 1);
1420
1511
if(ret == -1){
1421
1512
perror_plus("setenv");
1422
return false;
1513
_exit(EX_OSERR);
1423
1514
}
1424
1515
char *delaystring;
1425
1516
ret = asprintf(&delaystring, "%f", delay);
1426
1517
if(ret == -1){
1427
1518
perror_plus("asprintf");
1428
return false;
1519
_exit(EX_OSERR);
1429
1520
}
1430
1521
ret = setenv("DELAY", delaystring, 1);
1431
1522
if(ret == -1){
1432
1523
free(delaystring);
1433
1524
perror_plus("setenv");
1434
return false;
1525
_exit(EX_OSERR);
1435
1526
}
1436
1527
free(delaystring);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
1439
1539
} else {
1440
1540
int status;
1441
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1465
1565
}
1466
1566
}
1467
1567
free(fullname);
1468
if(quit_now){
1469
break;
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1470
1571
}
1471
1572
}
1472
1573
close(devnull);
1474
1575
return true;
1475
1576
}
1476
1577
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
1584
struct ifreq network;
1585
unsigned int if_index = if_nametoindex(interface);
1586
if(if_index == 0){
1587
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1588
errno = old_errno;
1589
return ENXIO;
1590
}
1591
1592
if(quit_now){
1593
errno = old_errno;
1594
return EINTR;
1595
}
1596
1597
if(not interface_is_up(interface)){
1598
if(not get_flags(interface, &network) and debug){
1599
ret_errno = errno;
1600
fprintf_plus(stderr, "Failed to get flags for interface "
1601
"\"%s\"\n", interface);
1602
return ret_errno;
1603
}
1604
network.ifr_flags |= IFF_UP;
1605
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
1608
ret_errno = errno;
1609
perror_plus("socket");
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
1614
if(quit_now){
1615
close(sd);
1616
errno = old_errno;
1617
return EINTR;
1618
}
1619
1620
if(debug){
1621
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1622
interface);
1623
}
1624
1625
/* Raise priviliges */
1626
raise_privileges();
1627
1628
#ifdef __linux__
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
1636
}
1637
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
1640
#ifdef __linux__
1641
if(restore_loglevel){
1642
ret_linux = klogctl(7, NULL, 0);
1643
if(ret_linux == -1){
1644
perror_plus("klogctl");
1645
}
1646
}
1647
#endif /* __linux__ */
1648
1649
/* Lower privileges */
1650
lower_privileges();
1651
1652
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1654
if(ret == -1){
1655
perror_plus("close");
1656
}
1657
1658
if(ret_setflags == -1){
1659
errno = ret_errno;
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
errno = old_errno;
1662
return ret_errno;
1663
}
1664
} else if(debug){
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
interface);
1667
}
1668
1669
/* Sleep checking until interface is running.
1670
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
1672
if(interface_is_running(interface)){
1673
break;
1674
}
1675
struct timespec sleeptime = { .tv_nsec = 250000000 };
1676
ret = nanosleep(&sleeptime, NULL);
1677
if(ret == -1 and errno != EINTR){
1678
perror_plus("nanosleep");
1679
}
1680
}
1681
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
1691
struct ifreq network;
1692
unsigned int if_index = if_nametoindex(interface);
1693
if(if_index == 0){
1694
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1695
errno = old_errno;
1696
return ENXIO;
1697
}
1698
if(interface_is_up(interface)){
1699
if(not get_flags(interface, &network) and debug){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
return ret_errno;
1704
}
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
1709
ret_errno = errno;
1710
perror_plus("socket");
1711
errno = old_errno;
1712
return ret_errno;
1713
}
1714
1715
if(debug){
1716
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1717
interface);
1718
}
1719
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
1728
1729
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1731
if(ret == -1){
1732
perror_plus("close");
1733
}
1734
1735
if(ret_setflags == -1){
1736
errno = ret_errno;
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
errno = old_errno;
1739
return ret_errno;
1740
}
1741
} else if(debug){
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1743
interface);
1744
}
1745
1746
errno = old_errno;
1747
return 0;
1748
}
1749
1477
1750
int main(int argc, char *argv[]){
1478
1751
AvahiSServiceBrowser *sb = NULL;
1479
int error;
1752
error_t ret_errno;
1480
1753
int ret;
1481
1754
intmax_t tmpmax;
1482
1755
char *tmp;
1483
1756
int exitcode = EXIT_SUCCESS;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
char *interfaces_to_take_down = NULL;
1760
size_t interfaces_to_take_down_size = 0;
1490
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1491
1762
bool tempdir_created = false;
1492
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1493
1764
const char *seckey = PATHDIR "/" SECKEY;
1494
1765
const char *pubkey = PATHDIR "/" PUBKEY;
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1495
1768
1496
1769
bool gnutls_initialized = false;
1497
1770
bool gpgme_initialized = false;
1559
1832
.group = 2 },
1560
1833
{ .name = "retry", .key = 132,
1561
1834
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
1835
.doc = "Retry interval used when denied by the Mandos server",
1563
1836
.group = 2 },
1564
1837
{ .name = "network-hook-dir", .key = 133,
1565
1838
.arg = "DIR",
1588
1861
connect_to = arg;
1589
1862
break;
1590
1863
case 'i': /* --interface */
1591
interface = arg;
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
1866
if(ret_errno != 0){
1867
argp_error(state, "%s", strerror(ret_errno));
1868
}
1592
1869
break;
1593
1870
case 's': /* --seckey */
1594
1871
seckey = arg;
1637
1914
argp_state_help(state, state->out_stream,
1638
1915
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
1916
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
1918
exit(argp_err_exit_status);
1644
1919
break;
1672
1947
{
1673
1948
/* Work around Debian bug #633582:
1674
1949
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1950
1677
1951
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
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");
1952
if(raise_privileges() == 0){
1953
struct stat st;
1954
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1956
int seckey_fd = open(seckey, O_RDONLY);
1957
if(seckey_fd == -1){
1958
perror_plus("open");
1959
} else {
1960
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1961
if(ret == -1){
1962
perror_plus("fstat");
1963
} else {
1964
if(S_ISREG(st.st_mode)
1965
and st.st_uid == 0 and st.st_gid == 0){
1966
ret = fchown(seckey_fd, uid, gid);
1967
if(ret == -1){
1968
perror_plus("fchown");
1969
}
1970
}
1971
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
1973
}
1974
}
1975
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
int pubkey_fd = open(pubkey, O_RDONLY);
1978
if(pubkey_fd == -1){
1979
perror_plus("open");
1980
} else {
1981
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1982
if(ret == -1){
1983
perror_plus("fstat");
1984
} else {
1985
if(S_ISREG(st.st_mode)
1986
and st.st_uid == 0 and st.st_gid == 0){
1987
ret = fchown(pubkey_fd, uid, gid);
1988
if(ret == -1){
1989
perror_plus("fchown");
1990
}
1991
}
1992
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
1997
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2002
}
2003
}
2004
}
2005
2006
/* Remove empty interface names */
2007
{
2008
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2010
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2014
" \"%s\"\n", interface);
2015
}
2016
argz_delete(&interfaces, &interfaces_size, interface);
2017
interface = NULL;
2018
}
1731
2019
}
1732
2020
}
1733
2021
1734
2022
/* Run network hooks */
1735
2023
{
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");
2024
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2025
interfaces, interfaces_size);
2026
if(ret_errno != 0){
2027
errno = ret_errno;
2028
perror_plus("argz_append");
2029
goto end;
2030
}
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2032
if(not run_network_hooks("start", interfaces_hooks, delay)){
2033
goto end;
1750
2034
}
1751
2035
}
1752
2036
1754
2038
avahi_set_log_function(empty_log);
1755
2039
}
1756
2040
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
1789
2041
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
2042
from the signal handler */
1791
2043
/* Initialize the pseudo-RNG for Avahi */
1861
2113
}
1862
2114
}
1863
2115
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
1968
break;
1969
}
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
2116
/* If no interfaces were specified, make a list */
2117
if(interfaces == NULL){
2118
struct dirent **direntries;
2119
/* Look for any good interfaces */
2120
ret = scandir(sys_class_net, &direntries, good_interface,
2121
alphasort);
2122
if(ret >= 1){
2123
/* Add all found interfaces to interfaces list */
2124
for(int i = 0; i < ret; ++i){
2125
ret_errno = argz_add(&interfaces, &interfaces_size,
2126
direntries[i]->d_name);
2127
if(ret_errno != 0){
2128
perror_plus("argz_add");
2129
continue;
2130
}
2131
if(debug){
2132
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2133
direntries[i]->d_name);
2134
}
2135
}
2136
free(direntries);
2137
} else {
2138
free(direntries);
2139
fprintf_plus(stderr, "Could not find a network interface\n");
2140
exitcode = EXIT_FAILURE;
2141
goto end;
2142
}
2143
}
2144
2145
/* If we only got one interface, explicitly use only that one */
2146
if(argz_count(interfaces, interfaces_size) == 1){
2147
if(debug){
2148
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2149
interfaces);
2150
}
2151
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2152
}
2153
2154
/* Bring up interfaces which are down */
2155
if(not (argz_count(interfaces, interfaces_size) == 1
2156
and strcmp(interfaces, "none") == 0)){
2157
char *interface = NULL;
2158
while((interface = argz_next(interfaces, interfaces_size,
2159
interface))){
2160
bool interface_was_up = interface_is_up(interface);
2161
ret = bring_up_interface(interface, delay);
2162
if(not interface_was_up){
2163
if(ret != 0){
2164
errno = ret;
2165
perror_plus("Failed to bring up interface");
2166
} else {
2167
ret_errno = argz_add(&interfaces_to_take_down,
2168
&interfaces_to_take_down_size,
2169
interface);
2170
}
2171
}
2172
}
2173
free(interfaces);
2174
interfaces = NULL;
2175
interfaces_size = 0;
2176
if(debug and (interfaces_to_take_down == NULL)){
2177
fprintf_plus(stderr, "No interfaces were brought up\n");
1998
2178
}
1999
2179
}
2000
2180
2041
2221
/* Connect directly, do not use Zeroconf */
2042
2222
/* (Mainly meant for debugging) */
2043
2223
char *address = strrchr(connect_to, ':');
2224
2044
2225
if(address == NULL){
2045
2226
fprintf_plus(stderr, "No colon in address\n");
2046
2227
exitcode = EX_USAGE;
2051
2232
goto end;
2052
2233
}
2053
2234
2054
uint16_t port;
2235
in_port_t port;
2055
2236
errno = 0;
2056
2237
tmpmax = strtoimax(address+1, &tmp, 10);
2057
2238
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
or tmpmax != (uint16_t)tmpmax){
2239
or tmpmax != (in_port_t)tmpmax){
2059
2240
fprintf_plus(stderr, "Bad port number\n");
2060
2241
exitcode = EX_USAGE;
2061
2242
goto end;
2065
2246
goto end;
2066
2247
}
2067
2248
2068
port = (uint16_t)tmpmax;
2249
port = (in_port_t)tmpmax;
2069
2250
*address = '\0';
2070
2251
/* Colon in address indicates IPv6 */
2071
2252
int af;
2121
2302
/* Allocate a new server */
2122
2303
mc.server = avahi_server_new(avahi_simple_poll_get
2123
2304
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2305
NULL, &ret_errno);
2125
2306
2126
2307
/* Free the Avahi configuration data */
2127
2308
avahi_server_config_free(&config);
2130
2311
/* Check if creating the Avahi server object succeeded */
2131
2312
if(mc.server == NULL){
2132
2313
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2314
avahi_strerror(ret_errno));
2134
2315
exitcode = EX_UNAVAILABLE;
2135
2316
goto end;
2136
2317
}
2192
2373
if(gpgme_initialized){
2193
2374
gpgme_release(mc.ctx);
2194
2375
}
2195
2376
2196
2377
/* Cleans up the circular linked list of Mandos servers the client
2197
2378
has seen */
2198
2379
if(mc.current_server != NULL){
2206
2387
2207
2388
/* Re-raise priviliges */
2208
2389
{
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2390
raise_privileges();
2391
2214
2392
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2393
run_network_hooks("stop", interfaces_hooks, delay);
2218
2394
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2395
/* Take down the network interfaces which were brought up */
2396
{
2397
char *interface = NULL;
2398
while((interface=argz_next(interfaces_to_take_down,
2399
interfaces_to_take_down_size,
2400
interface))){
2401
ret_errno = take_down_interface(interface);
2402
if(ret_errno != 0){
2403
errno = ret_errno;
2404
perror_plus("Failed to take down interface");
2229
2405
}
2230
2406
}
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2407
if(debug and (interfaces_to_take_down == NULL)){
2408
fprintf_plus(stderr, "No interfaces needed to be taken"
2409
" down\n");
2234
2410
}
2235
2411
}
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2412
2413
lower_privileges_permanently();
2414
}
2415
2416
free(interfaces_to_take_down);
2417
free(interfaces_hooks);
2243
2418
2244
2419
/* Removes the GPGME temp directory and all files inside */
2245
2420
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0