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- Committer: Teddy Hogeborn
- Date: 2012-06-16 22:38:54 UTC
- Revision ID: teddy@recompile.se-20120616223854-mfxkg6fgqr56sma5
* plugins.d/mandos-client (mandos_context): Removed "simple_poll"
member.
(simple_poll): New global variable. All users changed.
member.
(simple_poll): New global variable. All users changed.
- 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() */
88
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
88
WEXITSTATUS(), WTERMSIG() */
90
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() */
91
94
92
95
#ifdef __linux__
93
96
#include <sys/klog.h> /* klogctl() */
135
138
static const char sys_class_net[] = "/sys/class/net";
136
139
char *connect_to = NULL;
137
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
138
143
139
144
/* Doubly linked list that need to be circularly linked when used */
140
145
typedef struct server{
141
146
const char *ip;
142
uint16_t port;
147
in_port_t port;
143
148
AvahiIfIndex if_index;
144
149
int af;
145
150
struct timespec last_seen;
149
154
150
155
/* Used for passing in values through the Avahi callback functions */
151
156
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
157
AvahiServer *server;
154
158
gnutls_certificate_credentials_t cred;
155
159
unsigned int dh_bits;
159
163
server *current_server;
160
164
} mandos_context;
161
165
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
167
171
168
172
sig_atomic_t quit_now = 0;
169
173
int signal_received = 0;
170
174
171
175
/* Function to use when printing errors */
172
176
void perror_plus(const char *print_text){
177
int e = errno;
173
178
fprintf(stderr, "Mandos plugin %s: ",
174
179
program_invocation_short_name);
180
errno = e;
175
181
perror(print_text);
176
182
}
177
183
184
__attribute__((format (gnu_printf, 2, 3)))
178
185
int fprintf_plus(FILE *stream, const char *format, ...){
179
186
va_list ap;
180
187
va_start (ap, format);
202
209
}
203
210
204
211
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
212
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
207
214
int ret;
208
215
server *new_server = malloc(sizeof(server));
209
216
if(new_server == NULL){
210
217
perror_plus("malloc");
211
return -1;
218
return false;
212
219
}
213
220
*new_server = (server){ .ip = strdup(ip),
214
221
.port = port,
216
223
.af = af };
217
224
if(new_server->ip == NULL){
218
225
perror_plus("strdup");
219
return -1;
226
return false;
220
227
}
221
228
/* Special case of first server */
222
229
if (mc.current_server == NULL){
233
240
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
241
if(ret == -1){
235
242
perror_plus("clock_gettime");
236
return -1;
243
return false;
237
244
}
238
return 0;
245
return true;
239
246
}
240
247
241
248
/*
246
253
gpgme_error_t rc;
247
254
gpgme_engine_info_t engine_info;
248
255
249
250
256
/*
251
257
* Helper function to insert pub and seckey to the engine keyring.
252
258
*/
462
468
}
463
469
464
470
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
467
472
if(ret == NULL)
468
473
ret = "(unknown)";
469
474
return ret;
614
619
__attribute__((unused)) const char *txt){}
615
620
616
621
/* Called when a Mandos server is found */
617
static int start_mandos_communication(const char *ip, uint16_t port,
622
static int start_mandos_communication(const char *ip, in_port_t port,
618
623
AvahiIfIndex if_index,
619
624
int af){
620
625
int ret, tcp_sd = -1;
659
664
660
665
if(debug){
661
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
667
PRIuMAX "\n", ip, (uintmax_t)port);
663
668
}
664
669
665
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
696
701
goto mandos_end;
697
702
}
698
703
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
704
to.in6.sin6_port = htons(port);
703
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
707
-Wunreachable-code*/
729
731
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
732
perror_plus("if_indextoname");
731
733
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
734
736
}
735
737
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
738
740
}
739
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
818
820
goto mandos_end;
819
821
}
820
822
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
/* This casting via intptr_t is to eliminate warning about casting
824
an int to a pointer type. This is exactly how the GnuTLS Guile
825
function "set-session-transport-fd!" does it. */
826
gnutls_transport_set_ptr(session,
827
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
823
828
824
829
if(quit_now){
825
830
errno = EINTR;
998
1003
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
1004
flags,
1000
1005
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1006
if(r == NULL){
1007
return;
1008
}
1002
1009
1003
1010
/* Called whenever a service has been resolved successfully or
1004
1011
timed out */
1025
1032
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1033
host_name, ip, (intmax_t)interface, port);
1027
1034
}
1028
int ret = start_mandos_communication(ip, port, interface,
1035
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
interface,
1029
1037
avahi_proto_to_af(proto));
1030
1038
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1039
avahi_simple_poll_quit(simple_poll);
1032
1040
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1041
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
1035
1046
}
1036
1047
}
1037
1048
}
1048
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1049
1060
flags,
1050
1061
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1062
if(b == NULL){
1063
return;
1064
}
1052
1065
1053
1066
/* Called whenever a new services becomes available on the LAN or
1054
1067
is removed from the LAN */
1063
1076
1064
1077
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
1078
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1079
avahi_simple_poll_quit(simple_poll);
1067
1080
return;
1068
1081
1069
1082
case AVAHI_BROWSER_NEW:
1102
1115
signal_received = sig;
1103
1116
int old_errno = errno;
1104
1117
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1118
if(simple_poll != NULL){
1119
avahi_simple_poll_quit(simple_poll);
1107
1120
}
1108
1121
errno = old_errno;
1109
1122
}
1110
1123
1111
1124
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
1125
int ret;
1126
error_t ret_errno;
1113
1127
1114
1128
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
1129
if(s < 0){
1130
ret_errno = errno;
1116
1131
perror_plus("socket");
1132
errno = ret_errno;
1117
1133
return false;
1118
1134
}
1119
1135
strcpy(ifr->ifr_name, ifname);
1120
1136
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
1137
if(ret == -1){
1122
1138
if(debug){
1139
ret_errno = errno;
1123
1140
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1124
1142
}
1125
1143
return false;
1126
1144
}
1195
1213
}
1196
1214
1197
1215
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1216
* This function determines if a network interface is up.
1217
*/
1218
bool interface_is_up(const char *interface){
1219
struct ifreq ifr;
1220
if(not get_flags(interface, &ifr)){
1221
if(debug){
1222
fprintf_plus(stderr, "Failed to get flags for interface "
1223
"\"%s\"\n", interface);
1224
}
1225
return false;
1226
}
1227
1228
return (bool)(ifr.ifr_flags & IFF_UP);
1229
}
1230
1231
/*
1232
* This function determines if a network interface is running
1233
*/
1234
bool interface_is_running(const char *interface){
1235
struct ifreq ifr;
1236
if(not get_flags(interface, &ifr)){
1237
if(debug){
1238
fprintf_plus(stderr, "Failed to get flags for interface "
1239
"\"%s\"\n", interface);
1240
}
1241
return false;
1242
}
1243
1244
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1238
1245
}
1239
1246
1240
1247
int notdotentries(const struct dirent *direntry){
1357
1364
mc.current_server->if_index,
1358
1365
mc.current_server->af);
1359
1366
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1367
avahi_simple_poll_quit(simple_poll);
1361
1368
return 0;
1362
1369
}
1363
1370
ret = clock_gettime(CLOCK_MONOTONIC,
1381
1388
}
1382
1389
}
1383
1390
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1384
1443
bool run_network_hooks(const char *mode, const char *interface,
1385
1444
const float delay){
1386
1445
struct dirent **direntries;
1389
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
1449
alphasort);
1391
1450
if(numhooks == -1){
1392
perror_plus("scandir");
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1458
}
1393
1459
} else {
1394
1460
int devnull = open("/dev/null", O_RDONLY);
1395
1461
for(int i = 0; i < numhooks; i++){
1408
1474
if(hook_pid == 0){
1409
1475
/* Child */
1410
1476
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1477
raise_privileges_permanently();
1422
1478
/* Set group */
1423
1479
errno = 0;
1424
1480
ret = setgid(0);
1444
1500
perror_plus("setenv");
1445
1501
_exit(EX_OSERR);
1446
1502
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1503
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1448
1504
if(ret == -1){
1449
1505
perror_plus("setenv");
1450
1506
_exit(EX_OSERR);
1467
1523
_exit(EX_OSERR);
1468
1524
}
1469
1525
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1526
if(connect_to != NULL){
1527
ret = setenv("CONNECT", connect_to, 1);
1528
if(ret == -1){
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
}
1533
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1534
perror_plus("execl");
1535
_exit(EXIT_FAILURE);
1536
}
1472
1537
} else {
1473
1538
int status;
1474
1539
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1508
1573
return true;
1509
1574
}
1510
1575
1576
error_t bring_up_interface(const char *const interface,
1577
const float delay){
1578
int sd = -1;
1579
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
1582
struct ifreq network;
1583
unsigned int if_index = if_nametoindex(interface);
1584
if(if_index == 0){
1585
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1586
errno = old_errno;
1587
return ENXIO;
1588
}
1589
1590
if(quit_now){
1591
errno = old_errno;
1592
return EINTR;
1593
}
1594
1595
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
1597
ret_errno = errno;
1598
fprintf_plus(stderr, "Failed to get flags for interface "
1599
"\"%s\"\n", interface);
1600
return ret_errno;
1601
}
1602
network.ifr_flags |= IFF_UP;
1603
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
1606
ret_errno = errno;
1607
perror_plus("socket");
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
if(quit_now){
1613
close(sd);
1614
errno = old_errno;
1615
return EINTR;
1616
}
1617
1618
if(debug){
1619
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1620
interface);
1621
}
1622
1623
/* Raise priviliges */
1624
raise_privileges();
1625
1626
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
1634
}
1635
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
1638
#ifdef __linux__
1639
if(restore_loglevel){
1640
ret_linux = klogctl(7, NULL, 0);
1641
if(ret_linux == -1){
1642
perror_plus("klogctl");
1643
}
1644
}
1645
#endif /* __linux__ */
1646
1647
/* Lower privileges */
1648
lower_privileges();
1649
1650
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1652
if(ret == -1){
1653
perror_plus("close");
1654
}
1655
1656
if(ret_setflags == -1){
1657
errno = ret_errno;
1658
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
errno = old_errno;
1660
return ret_errno;
1661
}
1662
} else if(debug){
1663
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1664
interface);
1665
}
1666
1667
/* Sleep checking until interface is running.
1668
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
1670
if(interface_is_running(interface)){
1671
break;
1672
}
1673
struct timespec sleeptime = { .tv_nsec = 250000000 };
1674
ret = nanosleep(&sleeptime, NULL);
1675
if(ret == -1 and errno != EINTR){
1676
perror_plus("nanosleep");
1677
}
1678
}
1679
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1684
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
struct ifreq network;
1690
unsigned int if_index = if_nametoindex(interface);
1691
if(if_index == 0){
1692
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1693
errno = old_errno;
1694
return ENXIO;
1695
}
1696
if(interface_is_up(interface)){
1697
if(not get_flags(interface, &network) and debug){
1698
ret_errno = errno;
1699
fprintf_plus(stderr, "Failed to get flags for interface "
1700
"\"%s\"\n", interface);
1701
return ret_errno;
1702
}
1703
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
1707
ret_errno = errno;
1708
perror_plus("socket");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
1713
if(debug){
1714
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1715
interface);
1716
}
1717
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
1726
1727
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1729
if(ret == -1){
1730
perror_plus("close");
1731
}
1732
1733
if(ret_setflags == -1){
1734
errno = ret_errno;
1735
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
errno = old_errno;
1737
return ret_errno;
1738
}
1739
} else if(debug){
1740
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
interface);
1742
}
1743
1744
errno = old_errno;
1745
return 0;
1746
}
1747
1511
1748
int main(int argc, char *argv[]){
1512
1749
AvahiSServiceBrowser *sb = NULL;
1513
int error;
1750
error_t ret_errno;
1514
1751
int ret;
1515
1752
intmax_t tmpmax;
1516
1753
char *tmp;
1517
1754
int exitcode = EXIT_SUCCESS;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
char *interfaces_to_take_down = NULL;
1758
size_t interfaces_to_take_down_size = 0;
1524
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1525
1760
bool tempdir_created = false;
1526
1761
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1527
1762
const char *seckey = PATHDIR "/" SECKEY;
1528
1763
const char *pubkey = PATHDIR "/" PUBKEY;
1764
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1529
1766
1530
1767
bool gnutls_initialized = false;
1531
1768
bool gpgme_initialized = false;
1593
1830
.group = 2 },
1594
1831
{ .name = "retry", .key = 132,
1595
1832
.arg = "SECONDS",
1596
.doc = "Retry interval used when denied by the mandos server",
1833
.doc = "Retry interval used when denied by the Mandos server",
1597
1834
.group = 2 },
1598
1835
{ .name = "network-hook-dir", .key = 133,
1599
1836
.arg = "DIR",
1622
1859
connect_to = arg;
1623
1860
break;
1624
1861
case 'i': /* --interface */
1625
interface = arg;
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
1864
if(ret_errno != 0){
1865
argp_error(state, "%s", strerror(ret_errno));
1866
}
1626
1867
break;
1627
1868
case 's': /* --seckey */
1628
1869
seckey = arg;
1671
1912
argp_state_help(state, state->out_stream,
1672
1913
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
1914
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
1915
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1677
1916
exit(argp_err_exit_status);
1678
1917
break;
1708
1947
<http://bugs.debian.org/633582> */
1709
1948
1710
1949
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
1950
if(raise_privileges() == 0){
1716
1951
struct stat st;
1717
1952
1718
1953
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1766
2001
}
1767
2002
}
1768
2003
2004
/* Remove empty interface names */
2005
{
2006
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2008
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2011
fprintf_plus(stderr, "Not using nonexisting interface"
2012
" \"%s\"\n", interface);
2013
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2015
interface = NULL;
2016
}
2017
}
2018
}
2019
1769
2020
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2021
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2025
if(interfaces_hooks == NULL){
2026
perror_plus("malloc");
2027
goto end;
2028
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
2036
goto end;
2037
}
1772
2038
}
1773
2039
1774
2040
if(not debug){
1775
2041
avahi_set_log_function(empty_log);
1776
2042
}
1777
2043
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
1810
2044
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1811
2045
from the signal handler */
1812
2046
/* Initialize the pseudo-RNG for Avahi */
1813
2047
srand((unsigned int) time(NULL));
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2048
simple_poll = avahi_simple_poll_new();
2049
if(simple_poll == NULL){
1816
2050
fprintf_plus(stderr,
1817
2051
"Avahi: Failed to create simple poll object.\n");
1818
2052
exitcode = EX_UNAVAILABLE;
1882
2116
}
1883
2117
}
1884
2118
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
1970
}
1971
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
1989
break;
1990
}
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2119
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2122
/* Look for any good interfaces */
2123
ret = scandir(sys_class_net, &direntries, good_interface,
2124
alphasort);
2125
if(ret >= 1){
2126
/* Add all found interfaces to interfaces list */
2127
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2129
direntries[i]->d_name);
2130
if(ret_errno != 0){
2131
perror_plus("argz_add");
2132
continue;
2133
}
2134
if(debug){
2135
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
direntries[i]->d_name);
2137
}
2138
}
2139
free(direntries);
2140
} else {
2141
free(direntries);
2142
fprintf_plus(stderr, "Could not find a network interface\n");
2143
exitcode = EXIT_FAILURE;
2144
goto end;
2145
}
2146
}
2147
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2160
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2162
interface))){
2163
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2165
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2169
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2173
}
2174
}
2175
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
if(debug and (interfaces_to_take_down == NULL)){
2180
fprintf_plus(stderr, "No interfaces were brought up\n");
2019
2181
}
2020
2182
}
2021
2183
2062
2224
/* Connect directly, do not use Zeroconf */
2063
2225
/* (Mainly meant for debugging) */
2064
2226
char *address = strrchr(connect_to, ':');
2227
2065
2228
if(address == NULL){
2066
2229
fprintf_plus(stderr, "No colon in address\n");
2067
2230
exitcode = EX_USAGE;
2072
2235
goto end;
2073
2236
}
2074
2237
2075
uint16_t port;
2238
in_port_t port;
2076
2239
errno = 0;
2077
2240
tmpmax = strtoimax(address+1, &tmp, 10);
2078
2241
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
or tmpmax != (uint16_t)tmpmax){
2242
or tmpmax != (in_port_t)tmpmax){
2080
2243
fprintf_plus(stderr, "Bad port number\n");
2081
2244
exitcode = EX_USAGE;
2082
2245
goto end;
2086
2249
goto end;
2087
2250
}
2088
2251
2089
port = (uint16_t)tmpmax;
2252
port = (in_port_t)tmpmax;
2090
2253
*address = '\0';
2091
2254
/* Colon in address indicates IPv6 */
2092
2255
int af;
2140
2303
config.publish_domain = 0;
2141
2304
2142
2305
/* Allocate a new server */
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2306
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
2146
2308
2147
2309
/* Free the Avahi configuration data */
2148
2310
avahi_server_config_free(&config);
2151
2313
/* Check if creating the Avahi server object succeeded */
2152
2314
if(mc.server == NULL){
2153
2315
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
2316
avahi_strerror(ret_errno));
2155
2317
exitcode = EX_UNAVAILABLE;
2156
2318
goto end;
2157
2319
}
2181
2343
fprintf_plus(stderr, "Starting Avahi loop search\n");
2182
2344
}
2183
2345
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2346
ret = avahi_loop_with_timeout(simple_poll,
2185
2347
(int)(retry_interval * 1000));
2186
2348
if(debug){
2187
2349
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
2363
if(mc.server != NULL)
2202
2364
avahi_server_free(mc.server);
2203
2365
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2366
if(simple_poll != NULL)
2367
avahi_simple_poll_free(simple_poll);
2206
2368
2207
2369
if(gnutls_initialized){
2208
2370
gnutls_certificate_free_credentials(mc.cred);
2225
2387
}
2226
2388
}
2227
2389
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
2390
/* Re-raise priviliges */
2232
2391
{
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2237
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
2249
2408
}
2250
2409
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
2254
2413
}
2255
2414
}
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2415
2416
lower_privileges_permanently();
2417
}
2418
2419
free(interfaces_to_take_down);
2420
free(interfaces_hooks);
2263
2421
2264
2422
/* Removes the GPGME temp directory and all files inside */
2265
2423
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0