1105
812
case AVAHI_BROWSER_ALL_FOR_NOW:
1106
813
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1108
fprintf_plus(stderr, "No Mandos server found, still"
815
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
/* Signal handler that stops main loop after SIGTERM */
1116
static void handle_sigterm(int sig){
1121
signal_received = sig;
1122
int old_errno = errno;
1123
/* set main loop to exit */
1124
if(simple_poll != NULL){
1125
avahi_simple_poll_quit(simple_poll);
1130
bool get_flags(const char *ifname, struct ifreq *ifr){
1134
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1137
perror_plus("socket");
1141
strcpy(ifr->ifr_name, ifname);
1142
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1146
perror_plus("ioctl SIOCGIFFLAGS");
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
fprintf_plus(stderr, "Accepting point-to-point interface"
1168
" \"%s\"\n", ifname);
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1176
" \"%s\"\n", ifname);
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1183
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1189
/* Accept this device */
1191
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device.
1199
* (This function is passed to scandir(3) as a filter function.)
1201
int good_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1207
if(not get_flags(if_entry->d_name, &ifr)){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1215
if(not good_flags(if_entry->d_name, &ifr)){
1222
* This function determines if a network interface is up.
1224
bool interface_is_up(const char *interface){
1226
if(not get_flags(interface, &ifr)){
1228
fprintf_plus(stderr, "Failed to get flags for interface "
1229
"\"%s\"\n", interface);
1234
return (bool)(ifr.ifr_flags & IFF_UP);
1238
* This function determines if a network interface is running
1240
bool interface_is_running(const char *interface){
1242
if(not get_flags(interface, &ifr)){
1244
fprintf_plus(stderr, "Failed to get flags for interface "
1245
"\"%s\"\n", interface);
1250
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1253
int notdotentries(const struct dirent *direntry){
1254
/* Skip "." and ".." */
1255
if(direntry->d_name[0] == '.'
1256
and (direntry->d_name[1] == '\0'
1257
or (direntry->d_name[1] == '.'
1258
and direntry->d_name[2] == '\0'))){
1264
/* Is this directory entry a runnable program? */
1265
int runnable_hook(const struct dirent *direntry){
1270
if((direntry->d_name)[0] == '\0'){
1275
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
"abcdefghijklmnopqrstuvwxyz"
1279
if((direntry->d_name)[sret] != '\0'){
1280
/* Contains non-allowed characters */
1282
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1291
perror_plus("asprintf");
1295
ret = stat(fullname, &st);
1298
perror_plus("Could not stat hook");
1302
if(not (S_ISREG(st.st_mode))){
1303
/* Not a regular file */
1305
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1310
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1311
/* Not executable */
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1319
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
mandos_context *mc){
1328
struct timespec now;
1329
struct timespec waited_time;
1330
intmax_t block_time;
1333
if(mc->current_server == NULL){
1335
fprintf_plus(stderr, "Wait until first server is found."
1338
ret = avahi_simple_poll_iterate(s, -1);
1341
fprintf_plus(stderr, "Check current_server if we should run"
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
821
int main(int argc, char *argv[]){
822
AvahiSServiceBrowser *sb = NULL;
827
int exitcode = EXIT_SUCCESS;
828
const char *interface = "eth0";
829
struct ifreq network;
833
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
839
mandos_context mc = { .simple_poll = NULL, .server = NULL,
840
.dh_bits = 1024, .priority = "SECURE256"
841
":!CTYPE-X.509:+CTYPE-OPENPGP" };
842
bool gnutls_initialized = false;
843
bool gpgme_initialized = false;
846
struct argp_option options[] = {
847
{ .name = "debug", .key = 128,
848
.doc = "Debug mode", .group = 3 },
849
{ .name = "connect", .key = 'c',
850
.arg = "ADDRESS:PORT",
851
.doc = "Connect directly to a specific Mandos server",
853
{ .name = "interface", .key = 'i',
855
.doc = "Interface that will be used to search for Mandos"
858
{ .name = "seckey", .key = 's',
860
.doc = "OpenPGP secret key file base name",
862
{ .name = "pubkey", .key = 'p',
864
.doc = "OpenPGP public key file base name",
866
{ .name = "dh-bits", .key = 129,
868
.doc = "Bit length of the prime number used in the"
869
" Diffie-Hellman key exchange",
871
{ .name = "priority", .key = 130,
873
.doc = "GnuTLS priority string for the TLS handshake",
878
error_t parse_opt(int key, char *arg,
879
struct argp_state *state) {
881
case 128: /* --debug */
884
case 'c': /* --connect */
887
case 'i': /* --interface */
890
case 's': /* --seckey */
893
case 'p': /* --pubkey */
896
case 129: /* --dh-bits */
897
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
898
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
899
or arg[numchars] != '\0'){
900
fprintf(stderr, "Bad number of DH bits\n");
903
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
905
case 130: /* --priority */
913
return ARGP_ERR_UNKNOWN;
918
struct argp argp = { .options = options, .parser = parse_opt,
920
.doc = "Mandos client -- Get and decrypt"
921
" passwords from a Mandos server" };
922
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
923
if(ret == ARGP_ERR_UNKNOWN){
924
fprintf(stderr, "Unknown error while parsing arguments\n");
925
exitcode = EXIT_FAILURE;
930
/* If the interface is down, bring it up */
932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
935
exitcode = EXIT_FAILURE;
938
strcpy(network.ifr_name, interface);
939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1347
perror_plus("clock_gettime");
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc->current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc->current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1364
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc->current_server->ip,
1370
mc->current_server->port,
1371
mc->current_server->if_index,
1372
mc->current_server->af, mc);
1374
avahi_simple_poll_quit(s);
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc->current_server->last_seen);
941
perror("ioctl SIOCGIFFLAGS");
942
exitcode = EXIT_FAILURE;
945
if((network.ifr_flags & IFF_UP) == 0){
946
network.ifr_flags |= IFF_UP;
947
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1380
perror_plus("clock_gettime");
949
perror("ioctl SIOCSIFFLAGS");
950
exitcode = EXIT_FAILURE;
1383
mc->current_server = mc->current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1404
perror_plus("seteuid");
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1418
if(setuid(0) == -1){
1420
perror_plus("seteuid");
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1432
perror_plus("seteuid");
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1444
perror_plus("setuid");
1450
bool run_network_hooks(const char *mode, const char *interface,
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1458
if(errno == ENOENT){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1464
perror_plus("scandir");
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
973
ret = init_gnutls_global(&mc, pubkey, seckey);
975
fprintf(stderr, "init_gnutls_global failed\n");
976
exitcode = EXIT_FAILURE;
979
gnutls_initialized = true;
982
if(mkdtemp(tempdir) == NULL){
988
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
989
fprintf(stderr, "init_gpgme failed\n");
990
exitcode = EXIT_FAILURE;
993
gpgme_initialized = true;
996
if_index = (AvahiIfIndex) if_nametoindex(interface);
998
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1002
if(connect_to != NULL){
1003
/* Connect directly, do not use Zeroconf */
1004
/* (Mainly meant for debugging) */
1005
char *address = strrchr(connect_to, ':');
1006
if(address == NULL){
1007
fprintf(stderr, "No colon in address\n");
1008
exitcode = EXIT_FAILURE;
1012
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1013
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1014
or address[numchars+1] != '\0'){
1015
fprintf(stderr, "Bad port number\n");
1016
exitcode = EXIT_FAILURE;
1019
port = (uint16_t)tmpmax;
1021
address = connect_to;
1022
ret = start_mandos_communication(address, port, if_index, &mc);
1473
perror_plus("asprintf");
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1480
pid_t hook_pid = fork();
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1489
perror_plus("setgid");
1491
/* Reset supplementary groups */
1493
ret = setgroups(0, NULL);
1495
perror_plus("setgroups");
1497
dup2(devnull, STDIN_FILENO);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1502
perror_plus("setenv");
1505
ret = setenv("DEVICE", interface, 1);
1507
perror_plus("setenv");
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1512
perror_plus("setenv");
1515
ret = setenv("MODE", mode, 1);
1517
perror_plus("setenv");
1521
ret = asprintf(&delaystring, "%f", delay);
1523
perror_plus("asprintf");
1526
ret = setenv("DELAY", delaystring, 1);
1529
perror_plus("setenv");
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1536
perror_plus("setenv");
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1024
exitcode = EXIT_FAILURE;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1583
error_t bring_up_interface(const char *const interface,
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1589
struct ifreq network;
1590
unsigned int if_index = if_nametoindex(interface);
1592
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1602
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
1605
fprintf_plus(stderr, "Failed to get flags for interface "
1606
"\"%s\"\n", interface);
1609
network.ifr_flags |= IFF_UP;
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1614
perror_plus("socket");
1626
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1630
/* Raise priviliges */
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
1642
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1646
if(restore_loglevel){
1647
ret_linux = klogctl(7, NULL, 0);
1648
if(ret_linux == -1){
1649
perror_plus("klogctl");
1652
#endif /* __linux__ */
1654
/* Lower privileges */
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1660
perror_plus("close");
1663
if(ret_setflags == -1){
1665
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1670
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1674
/* Sleep checking until interface is running.
1675
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
1677
if(interface_is_running(interface)){
1680
struct timespec sleeptime = { .tv_nsec = 250000000 };
1681
ret = nanosleep(&sleeptime, NULL);
1682
if(ret == -1 and errno != EINTR){
1683
perror_plus("nanosleep");
1691
error_t take_down_interface(const char *const interface){
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
1696
struct ifreq network;
1697
unsigned int if_index = if_nametoindex(interface);
1699
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1703
if(interface_is_up(interface)){
1704
if(not get_flags(interface, &network) and debug){
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", interface);
1710
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1715
perror_plus("socket");
1721
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1725
/* Raise priviliges */
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1731
/* Lower privileges */
1734
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1737
perror_plus("close");
1740
if(ret_setflags == -1){
1742
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1747
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1755
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1759
AvahiSServiceBrowser *sb = NULL;
1764
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
char *interfaces_to_take_down = NULL;
1768
size_t interfaces_to_take_down_size = 0;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
const char *seckey = PATHDIR "/" SECKEY;
1773
const char *pubkey = PATHDIR "/" PUBKEY;
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1777
bool gnutls_initialized = false;
1778
bool gpgme_initialized = false;
1780
double retry_interval = 10; /* 10s between trying a server and
1781
retrying the same server again */
1783
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1784
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1789
/* Lower any group privileges we might have, just to be safe */
1793
perror_plus("setgid");
1796
/* Lower user privileges (temporarily) */
1800
perror_plus("seteuid");
1808
struct argp_option options[] = {
1809
{ .name = "debug", .key = 128,
1810
.doc = "Debug mode", .group = 3 },
1811
{ .name = "connect", .key = 'c',
1812
.arg = "ADDRESS:PORT",
1813
.doc = "Connect directly to a specific Mandos server",
1815
{ .name = "interface", .key = 'i',
1817
.doc = "Network interface that will be used to search for"
1820
{ .name = "seckey", .key = 's',
1822
.doc = "OpenPGP secret key file base name",
1824
{ .name = "pubkey", .key = 'p',
1826
.doc = "OpenPGP public key file base name",
1828
{ .name = "dh-bits", .key = 129,
1830
.doc = "Bit length of the prime number used in the"
1831
" Diffie-Hellman key exchange",
1833
{ .name = "priority", .key = 130,
1835
.doc = "GnuTLS priority string for the TLS handshake",
1837
{ .name = "delay", .key = 131,
1839
.doc = "Maximum delay to wait for interface startup",
1841
{ .name = "retry", .key = 132,
1843
.doc = "Retry interval used when denied by the Mandos server",
1845
{ .name = "network-hook-dir", .key = 133,
1847
.doc = "Directory where network hooks are located",
1850
* These reproduce what we would get without ARGP_NO_HELP
1852
{ .name = "help", .key = '?',
1853
.doc = "Give this help list", .group = -1 },
1854
{ .name = "usage", .key = -3,
1855
.doc = "Give a short usage message", .group = -1 },
1856
{ .name = "version", .key = 'V',
1857
.doc = "Print program version", .group = -1 },
1861
error_t parse_opt(int key, char *arg,
1862
struct argp_state *state){
1865
case 128: /* --debug */
1868
case 'c': /* --connect */
1871
case 'i': /* --interface */
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1875
argp_error(state, "%s", strerror(ret_errno));
1878
case 's': /* --seckey */
1881
case 'p': /* --pubkey */
1884
case 129: /* --dh-bits */
1886
tmpmax = strtoimax(arg, &tmp, 10);
1887
if(errno != 0 or tmp == arg or *tmp != '\0'
1888
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1889
argp_error(state, "Bad number of DH bits");
1891
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1893
case 130: /* --priority */
1896
case 131: /* --delay */
1898
delay = strtof(arg, &tmp);
1899
if(errno != 0 or tmp == arg or *tmp != '\0'){
1900
argp_error(state, "Bad delay");
1902
case 132: /* --retry */
1904
retry_interval = strtod(arg, &tmp);
1905
if(errno != 0 or tmp == arg or *tmp != '\0'
1906
or (retry_interval * 1000) > INT_MAX
1907
or retry_interval < 0){
1908
argp_error(state, "Bad retry interval");
1911
case 133: /* --network-hook-dir */
1915
* These reproduce what we would get without ARGP_NO_HELP
1917
case '?': /* --help */
1918
argp_state_help(state, state->out_stream,
1919
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1920
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1921
case -3: /* --usage */
1922
argp_state_help(state, state->out_stream,
1923
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1924
case 'V': /* --version */
1925
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1926
exit(argp_err_exit_status);
1929
return ARGP_ERR_UNKNOWN;
1934
struct argp argp = { .options = options, .parser = parse_opt,
1936
.doc = "Mandos client -- Get and decrypt"
1937
" passwords from a Mandos server" };
1938
ret = argp_parse(&argp, argc, argv,
1939
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1946
perror_plus("argp_parse");
1947
exitcode = EX_OSERR;
1950
exitcode = EX_USAGE;
1956
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
1963
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1964
int seckey_fd = open(seckey, O_RDONLY);
1965
if(seckey_fd == -1){
1966
perror_plus("open");
1968
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1970
perror_plus("fstat");
1972
if(S_ISREG(st.st_mode)
1973
and st.st_uid == 0 and st.st_gid == 0){
1974
ret = fchown(seckey_fd, uid, gid);
1976
perror_plus("fchown");
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
1984
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
int pubkey_fd = open(pubkey, O_RDONLY);
1986
if(pubkey_fd == -1){
1987
perror_plus("open");
1989
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1991
perror_plus("fstat");
1993
if(S_ISREG(st.st_mode)
1994
and st.st_uid == 0 and st.st_gid == 0){
1995
ret = fchown(pubkey_fd, uid, gid);
1997
perror_plus("fchown");
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2005
/* Lower privileges */
2009
perror_plus("seteuid");
2014
/* Remove empty interface names */
2016
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2021
fprintf_plus(stderr, "Not using nonexisting interface"
2022
" \"%s\"\n", interface);
2024
argz_delete(&interfaces, &interfaces_size, interface);
2030
/* Run network hooks */
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2035
if(interfaces_hooks == NULL){
2036
perror_plus("malloc");
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2051
avahi_set_log_function(empty_log);
2054
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2055
from the signal handler */
2056
/* Initialize the pseudo-RNG for Avahi */
2057
srand((unsigned int) time(NULL));
2058
simple_poll = avahi_simple_poll_new();
2059
if(simple_poll == NULL){
2060
fprintf_plus(stderr,
2061
"Avahi: Failed to create simple poll object.\n");
2062
exitcode = EX_UNAVAILABLE;
2066
sigemptyset(&sigterm_action.sa_mask);
2067
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2069
perror_plus("sigaddset");
2070
exitcode = EX_OSERR;
2073
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2075
perror_plus("sigaddset");
2076
exitcode = EX_OSERR;
2079
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2081
perror_plus("sigaddset");
2082
exitcode = EX_OSERR;
2085
/* Need to check if the handler is SIG_IGN before handling:
2086
| [[info:libc:Initial Signal Actions]] |
2087
| [[info:libc:Basic Signal Handling]] |
2089
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2091
perror_plus("sigaction");
2094
if(old_sigterm_action.sa_handler != SIG_IGN){
2095
ret = sigaction(SIGINT, &sigterm_action, NULL);
2097
perror_plus("sigaction");
2098
exitcode = EX_OSERR;
2102
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2104
perror_plus("sigaction");
2107
if(old_sigterm_action.sa_handler != SIG_IGN){
2108
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2110
perror_plus("sigaction");
2111
exitcode = EX_OSERR;
2115
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2117
perror_plus("sigaction");
2120
if(old_sigterm_action.sa_handler != SIG_IGN){
2121
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2123
perror_plus("sigaction");
2124
exitcode = EX_OSERR;
2129
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2132
/* Look for any good interfaces */
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2136
/* Add all found interfaces to interfaces list */
2137
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2139
direntries[i]->d_name);
2141
perror_plus("argz_add");
2145
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
direntries[i]->d_name);
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2153
exitcode = EXIT_FAILURE;
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2170
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2173
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2175
if(not interface_was_up){
2178
perror_plus("Failed to bring up interface");
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2188
interfaces_size = 0;
2189
if(debug and (interfaces_to_take_down == NULL)){
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
2200
fprintf_plus(stderr, "init_gnutls_global failed\n");
2201
exitcode = EX_UNAVAILABLE;
2204
gnutls_initialized = true;
2211
if(mkdtemp(tempdir) == NULL){
2212
perror_plus("mkdtemp");
2215
tempdir_created = true;
2221
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2222
fprintf_plus(stderr, "init_gpgme failed\n");
2223
exitcode = EX_UNAVAILABLE;
2226
gpgme_initialized = true;
2233
if(connect_to != NULL){
2234
/* Connect directly, do not use Zeroconf */
2235
/* (Mainly meant for debugging) */
2236
char *address = strrchr(connect_to, ':');
2238
if(address == NULL){
2239
fprintf_plus(stderr, "No colon in address\n");
2240
exitcode = EX_USAGE;
2250
tmpmax = strtoimax(address+1, &tmp, 10);
2251
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2252
or tmpmax != (in_port_t)tmpmax){
2253
fprintf_plus(stderr, "Bad port number\n");
2254
exitcode = EX_USAGE;
2262
port = (in_port_t)tmpmax;
2264
/* Colon in address indicates IPv6 */
2266
if(strchr(connect_to, ':') != NULL){
2268
/* Accept [] around IPv6 address - see RFC 5952 */
2269
if(connect_to[0] == '[' and address[-1] == ']')
2277
address = connect_to;
2283
while(not quit_now){
2284
ret = start_mandos_communication(address, port, if_index, af,
2286
if(quit_now or ret == 0){
2290
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
(int)retry_interval);
2293
sleep((int)retry_interval);
2297
exitcode = EXIT_SUCCESS;
2308
AvahiServerConfig config;
2309
/* Do not publish any local Zeroconf records */
2310
avahi_server_config_init(&config);
2311
config.publish_hinfo = 0;
2312
config.publish_addresses = 0;
2313
config.publish_workstation = 0;
2314
config.publish_domain = 0;
2316
/* Allocate a new server */
2317
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
2320
/* Free the Avahi configuration data */
2321
avahi_server_config_free(&config);
2324
/* Check if creating the Avahi server object succeeded */
2325
if(mc.server == NULL){
2326
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
2328
exitcode = EX_UNAVAILABLE;
2336
/* Create the Avahi service browser */
2337
sb = avahi_s_service_browser_new(mc.server, if_index,
2338
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2339
NULL, 0, browse_callback,
2342
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2343
avahi_strerror(avahi_server_errno(mc.server)));
2344
exitcode = EX_UNAVAILABLE;
2352
/* Run the main loop */
2355
fprintf_plus(stderr, "Starting Avahi loop search\n");
2358
ret = avahi_loop_with_timeout(simple_poll,
2359
(int)(retry_interval * 1000), &mc);
2361
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2362
(ret == 0) ? "successfully" : "with error");
1026
exitcode = EXIT_SUCCESS;
1032
avahi_set_log_function(empty_log);
1035
/* Initialize the pseudo-RNG for Avahi */
1036
srand((unsigned int) time(NULL));
1038
/* Allocate main Avahi loop object */
1039
mc.simple_poll = avahi_simple_poll_new();
1040
if(mc.simple_poll == NULL) {
1041
fprintf(stderr, "Avahi: Failed to create simple poll"
1043
exitcode = EXIT_FAILURE;
1048
AvahiServerConfig config;
1049
/* Do not publish any local Zeroconf records */
1050
avahi_server_config_init(&config);
1051
config.publish_hinfo = 0;
1052
config.publish_addresses = 0;
1053
config.publish_workstation = 0;
1054
config.publish_domain = 0;
1056
/* Allocate a new server */
1057
mc.server = avahi_server_new(avahi_simple_poll_get
1058
(mc.simple_poll), &config, NULL,
1061
/* Free the Avahi configuration data */
1062
avahi_server_config_free(&config);
1065
/* Check if creating the Avahi server object succeeded */
1066
if(mc.server == NULL) {
1067
fprintf(stderr, "Failed to create Avahi server: %s\n",
1068
avahi_strerror(error));
1069
exitcode = EXIT_FAILURE;
1073
/* Create the Avahi service browser */
1074
sb = avahi_s_service_browser_new(mc.server, if_index,
1076
"_mandos._tcp", NULL, 0,
1077
browse_callback, &mc);
1079
fprintf(stderr, "Failed to create service browser: %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
exitcode = EXIT_FAILURE;
1085
/* Run the main loop */
1088
fprintf(stderr, "Starting Avahi loop search\n");
1091
avahi_simple_poll_loop(mc.simple_poll);
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2371
/* Cleanup things */
2373
avahi_s_service_browser_free(sb);
2375
if(mc.server != NULL)
2376
avahi_server_free(mc.server);
2378
if(simple_poll != NULL)
2379
avahi_simple_poll_free(simple_poll);
2381
if(gnutls_initialized){
2382
gnutls_certificate_free_credentials(mc.cred);
2383
gnutls_global_deinit();
2384
gnutls_dh_params_deinit(mc.dh_params);
2387
if(gpgme_initialized){
2388
gpgme_release(mc.ctx);
2391
/* Cleans up the circular linked list of Mandos servers the client
2393
if(mc.current_server != NULL){
2394
mc.current_server->prev->next = NULL;
2395
while(mc.current_server != NULL){
2396
server *next = mc.current_server->next;
2397
free(mc.current_server);
2398
mc.current_server = next;
2402
/* Re-raise priviliges */
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2410
/* Take down the network interfaces which were brought up */
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2416
ret_errno = take_down_interface(interface);
2419
perror_plus("Failed to take down interface");
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2428
lower_privileges_permanently();
2431
free(interfaces_to_take_down);
2432
free(interfaces_hooks);
2434
/* Removes the GPGME temp directory and all files inside */
2435
if(tempdir_created){
2436
struct dirent **direntries = NULL;
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
2442
direntry = direntries[i];
2443
char *fullname = NULL;
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
2447
perror_plus("asprintf");
2450
ret = remove(fullname);
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2459
/* need to clean even if 0 because man page doesn't specify */
2461
if (numentries == -1){
2462
perror_plus("scandir");
2464
ret = rmdir(tempdir);
2465
if(ret == -1 and errno != ENOENT){
2466
perror_plus("rmdir");
2471
sigemptyset(&old_sigterm_action.sa_mask);
2472
old_sigterm_action.sa_handler = SIG_DFL;
2473
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2474
&old_sigterm_action,
2477
perror_plus("sigaction");
2480
ret = raise(signal_received);
2481
} while(ret != 0 and errno == EINTR);
2483
perror_plus("raise");
2486
TEMP_FAILURE_RETRY(pause());
1096
fprintf(stderr, "%s exiting\n", argv[0]);
1099
/* Cleanup things */
1101
avahi_s_service_browser_free(sb);
1103
if(mc.server != NULL)
1104
avahi_server_free(mc.server);
1106
if(mc.simple_poll != NULL)
1107
avahi_simple_poll_free(mc.simple_poll);
1109
if(gnutls_initialized){
1110
gnutls_certificate_free_credentials(mc.cred);
1111
gnutls_global_deinit();
1112
gnutls_dh_params_deinit(mc.dh_params);
1115
if(gpgme_initialized){
1116
gpgme_release(mc.ctx);
1119
/* Removes the temp directory used by GPGME */
1120
if(tempdir[0] != '\0'){
1122
struct dirent *direntry;
1123
d = opendir(tempdir);
1125
if(errno != ENOENT){
1130
direntry = readdir(d);
1131
if(direntry == NULL){
1134
/* Skip "." and ".." */
1135
if(direntry->d_name[0] == '.'
1136
and (direntry->d_name[1] == '\0'
1137
or (direntry->d_name[1] == '.'
1138
and direntry->d_name[2] == '\0'))){
1141
char *fullname = NULL;
1142
ret = asprintf(&fullname, "%s/%s", tempdir,
1148
ret = remove(fullname);
1150
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1157
ret = rmdir(tempdir);
1158
if(ret == -1 and errno != ENOENT){