812
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
813
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
815
fprintf(stderr, "No Mandos server found, still searching...\n");
1089
fprintf_plus(stderr, "No Mandos server found, still"
1096
/* Signal handler that stops main loop after SIGTERM */
1097
static void handle_sigterm(int sig){
1102
signal_received = sig;
1103
int old_errno = errno;
1104
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1116
perror_plus("socket");
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1123
perror_plus("ioctl SIOCGIFFLAGS");
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1165
/* Accept this device */
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1183
if(not get_flags(if_entry->d_name, &ifr)){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1191
if(not good_flags(if_entry->d_name, &ifr)){
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.)
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1208
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1234
if(not good_flags(if_entry->d_name, &ifr)){
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1257
if((direntry->d_name)[0] == '\0'){
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1278
perror_plus("asprintf");
1282
ret = stat(fullname, &st);
1285
perror_plus("Could not stat hook");
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1319
if(mc.current_server == NULL){
1321
fprintf_plus(stderr, "Wait until first server is found."
1324
ret = avahi_simple_poll_iterate(s, -1);
1327
fprintf_plus(stderr, "Check current_server if we should run"
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1333
perror_plus("clock_gettime");
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1360
avahi_simple_poll_quit(mc.simple_poll);
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1366
perror_plus("clock_gettime");
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1384
bool run_network_hooks(const char *mode, const char *interface,
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1392
perror_plus("scandir");
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1400
perror_plus("asprintf");
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1407
pid_t hook_pid = fork();
1410
/* Raise privileges */
1414
perror_plus("seteuid");
1416
/* Raise privileges even more */
1420
perror_plus("setuid");
1426
perror_plus("setgid");
1428
/* Reset supplementary groups */
1430
ret = setgroups(0, NULL);
1432
perror_plus("setgroups");
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
perror_plus("setenv");
1444
ret = setenv("DEVICE", interface, 1);
1446
perror_plus("setenv");
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
perror_plus("setenv");
1454
ret = setenv("MODE", mode, 1);
1456
perror_plus("setenv");
1460
ret = asprintf(&delaystring, "%f", delay);
1462
perror_plus("asprintf");
1465
ret = setenv("DELAY", delaystring, 1);
1468
perror_plus("setenv");
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
821
1513
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_initalized = false;
843
bool gpgme_initalized = false;
847
struct argp_option options[] = {
848
{ .name = "debug", .key = 128,
849
.doc = "Debug mode", .group = 3 },
850
{ .name = "connect", .key = 'c',
851
.arg = "ADDRESS:PORT",
852
.doc = "Connect directly to a specific Mandos server",
854
{ .name = "interface", .key = 'i',
856
.doc = "Interface that will be used to search for Mandos"
859
{ .name = "seckey", .key = 's',
861
.doc = "OpenPGP secret key file base name",
863
{ .name = "pubkey", .key = 'p',
865
.doc = "OpenPGP public key file base name",
867
{ .name = "dh-bits", .key = 129,
869
.doc = "Bit length of the prime number used in the"
870
" Diffie-Hellman key exchange",
872
{ .name = "priority", .key = 130,
874
.doc = "GnuTLS priority string for the TLS handshake",
876
{ .name = "delay", .key = 131,
878
.doc = "Maximum delay to wait for interface startup",
883
error_t parse_opt(int key, char *arg,
884
struct argp_state *state) {
886
case 128: /* --debug */
889
case 'c': /* --connect */
892
case 'i': /* --interface */
895
case 's': /* --seckey */
898
case 'p': /* --pubkey */
901
case 129: /* --dh-bits */
902
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
903
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
904
or arg[numchars] != '\0'){
905
fprintf(stderr, "Bad number of DH bits\n");
908
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
910
case 130: /* --priority */
913
case 131: /* --delay */
914
ret = sscanf(arg, "%lf%n", &delay, &numchars);
915
if(ret < 1 or arg[numchars] != '\0'){
916
fprintf(stderr, "Bad delay\n");
925
return ARGP_ERR_UNKNOWN;
930
struct argp argp = { .options = options, .parser = parse_opt,
932
.doc = "Mandos client -- Get and decrypt"
933
" passwords from a Mandos server" };
934
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
935
if(ret == ARGP_ERR_UNKNOWN){
936
fprintf(stderr, "Unknown error while parsing arguments\n");
937
exitcode = EXIT_FAILURE;
942
/* If the interface is down, bring it up */
944
// Lower kernel loglevel to KERN_NOTICE to avoid
945
// KERN_INFO messages to mess up the prompt
946
ret = klogctl(8, NULL, 5);
951
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
954
exitcode = EXIT_FAILURE;
955
ret = klogctl(7, NULL, 0);
961
strcpy(network.ifr_name, interface);
962
ret = ioctl(sd, SIOCGIFFLAGS, &network);
964
perror("ioctl SIOCGIFFLAGS");
965
ret = klogctl(7, NULL, 0);
969
exitcode = EXIT_FAILURE;
972
if((network.ifr_flags & IFF_UP) == 0){
973
network.ifr_flags |= IFF_UP;
974
ret = ioctl(sd, SIOCSIFFLAGS, &network);
976
perror("ioctl SIOCSIFFLAGS");
977
exitcode = EXIT_FAILURE;
1514
AvahiSServiceBrowser *sb = NULL;
1519
int exitcode = EXIT_SUCCESS;
1520
const char *interface = "";
1521
struct ifreq network;
1523
bool take_down_interface = false;
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1527
bool tempdir_created = false;
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1529
const char *seckey = PATHDIR "/" SECKEY;
1530
const char *pubkey = PATHDIR "/" PUBKEY;
1532
bool gnutls_initialized = false;
1533
bool gpgme_initialized = false;
1535
double retry_interval = 10; /* 10s between trying a server and
1536
retrying the same server again */
1538
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1539
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1544
/* Lower any group privileges we might have, just to be safe */
1548
perror_plus("setgid");
1551
/* Lower user privileges (temporarily) */
1555
perror_plus("seteuid");
1563
struct argp_option options[] = {
1564
{ .name = "debug", .key = 128,
1565
.doc = "Debug mode", .group = 3 },
1566
{ .name = "connect", .key = 'c',
1567
.arg = "ADDRESS:PORT",
1568
.doc = "Connect directly to a specific Mandos server",
1570
{ .name = "interface", .key = 'i',
1572
.doc = "Network interface that will be used to search for"
1575
{ .name = "seckey", .key = 's',
1577
.doc = "OpenPGP secret key file base name",
1579
{ .name = "pubkey", .key = 'p',
1581
.doc = "OpenPGP public key file base name",
1583
{ .name = "dh-bits", .key = 129,
1585
.doc = "Bit length of the prime number used in the"
1586
" Diffie-Hellman key exchange",
1588
{ .name = "priority", .key = 130,
1590
.doc = "GnuTLS priority string for the TLS handshake",
1592
{ .name = "delay", .key = 131,
1594
.doc = "Maximum delay to wait for interface startup",
1596
{ .name = "retry", .key = 132,
1598
.doc = "Retry interval used when denied by the mandos server",
1600
{ .name = "network-hook-dir", .key = 133,
1602
.doc = "Directory where network hooks are located",
1605
* These reproduce what we would get without ARGP_NO_HELP
1607
{ .name = "help", .key = '?',
1608
.doc = "Give this help list", .group = -1 },
1609
{ .name = "usage", .key = -3,
1610
.doc = "Give a short usage message", .group = -1 },
1611
{ .name = "version", .key = 'V',
1612
.doc = "Print program version", .group = -1 },
1616
error_t parse_opt(int key, char *arg,
1617
struct argp_state *state){
1620
case 128: /* --debug */
1623
case 'c': /* --connect */
1626
case 'i': /* --interface */
1629
case 's': /* --seckey */
1632
case 'p': /* --pubkey */
1635
case 129: /* --dh-bits */
1637
tmpmax = strtoimax(arg, &tmp, 10);
1638
if(errno != 0 or tmp == arg or *tmp != '\0'
1639
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1640
argp_error(state, "Bad number of DH bits");
1642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1644
case 130: /* --priority */
1647
case 131: /* --delay */
1649
delay = strtof(arg, &tmp);
1650
if(errno != 0 or tmp == arg or *tmp != '\0'){
1651
argp_error(state, "Bad delay");
1653
case 132: /* --retry */
1655
retry_interval = strtod(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'
1657
or (retry_interval * 1000) > INT_MAX
1658
or retry_interval < 0){
1659
argp_error(state, "Bad retry interval");
1662
case 133: /* --network-hook-dir */
1666
* These reproduce what we would get without ARGP_NO_HELP
1668
case '?': /* --help */
1669
argp_state_help(state, state->out_stream,
1670
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1671
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1672
case -3: /* --usage */
1673
argp_state_help(state, state->out_stream,
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
exit(argp_err_exit_status);
1682
return ARGP_ERR_UNKNOWN;
1687
struct argp argp = { .options = options, .parser = parse_opt,
1689
.doc = "Mandos client -- Get and decrypt"
1690
" passwords from a Mandos server" };
1691
ret = argp_parse(&argp, argc, argv,
1692
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1699
perror_plus("argp_parse");
1700
exitcode = EX_OSERR;
1703
exitcode = EX_USAGE;
1709
/* Work around Debian bug #633582:
1710
<http://bugs.debian.org/633582> */
1712
/* Re-raise priviliges */
1716
perror_plus("seteuid");
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1727
perror_plus("fstat");
1729
if(S_ISREG(st.st_mode)
1730
and st.st_uid == 0 and st.st_gid == 0){
1731
ret = fchown(seckey_fd, uid, gid);
1733
perror_plus("fchown");
1737
TEMP_FAILURE_RETRY(close(seckey_fd));
1741
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
int pubkey_fd = open(pubkey, O_RDONLY);
1743
if(pubkey_fd == -1){
1744
perror_plus("open");
1746
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1748
perror_plus("fstat");
1750
if(S_ISREG(st.st_mode)
1751
and st.st_uid == 0 and st.st_gid == 0){
1752
ret = fchown(pubkey_fd, uid, gid);
1754
perror_plus("fchown");
1758
TEMP_FAILURE_RETRY(close(pubkey_fd));
1762
/* Lower privileges */
1766
perror_plus("seteuid");
1771
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1777
avahi_set_log_function(empty_log);
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1786
/* No up interfaces, look for any good interfaces */
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1797
if(interface == NULL){
1798
perror_plus("malloc");
1800
exitcode = EXIT_FAILURE;
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
from the signal handler */
1814
/* Initialize the pseudo-RNG for Avahi */
1815
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf_plus(stderr,
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1824
sigemptyset(&sigterm_action.sa_mask);
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1849
perror_plus("sigaction");
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1862
perror_plus("sigaction");
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1875
perror_plus("sigaction");
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1900
/* Re-raise priviliges */
1904
perror_plus("seteuid");
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1916
#endif /* __linux__ */
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1926
perror_plus("klogctl");
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1934
perror_plus("seteuid");
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
perror_plus("ioctl SIOCGIFFLAGS");
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1946
perror_plus("klogctl");
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1955
perror_plus("seteuid");
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1968
if(restore_loglevel){
978
1969
ret = klogctl(7, NULL, 0);
1971
perror_plus("klogctl");
985
// sleep checking until interface is running
986
for(int i=0; i < delay * 4; i++){
987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1974
#endif /* __linux__ */
1975
/* Lower privileges */
989
perror("ioctl SIOCGIFFLAGS");
990
} else if(network.ifr_flags & IFF_RUNNING){
1979
perror_plus("seteuid");
993
struct timespec sleeptime = { .tv_nsec = 250000000 };
994
nanosleep(&sleeptime, NULL);
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
996
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
perror_plus("close");
1000
// Restores kernel loglevel to default
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
1001
2009
ret = klogctl(7, NULL, 0);
1020
ret = init_gnutls_global(&mc, pubkey, seckey);
1022
fprintf(stderr, "init_gnutls_global failed\n");
1023
exitcode = EXIT_FAILURE;
1026
gnutls_initalized = true;
1029
if(mkdtemp(tempdir) == NULL){
1035
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1036
fprintf(stderr, "gpgme_initalized failed\n");
1037
exitcode = EXIT_FAILURE;
1040
gpgme_initalized = true;
1043
if_index = (AvahiIfIndex) if_nametoindex(interface);
1045
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1049
if(connect_to != NULL){
1050
/* Connect directly, do not use Zeroconf */
1051
/* (Mainly meant for debugging) */
1052
char *address = strrchr(connect_to, ':');
1053
if(address == NULL){
1054
fprintf(stderr, "No colon in address\n");
1055
exitcode = EXIT_FAILURE;
1059
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1060
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1061
or address[numchars+1] != '\0'){
1062
fprintf(stderr, "Bad port number\n");
1063
exitcode = EXIT_FAILURE;
1066
port = (uint16_t)tmpmax;
1068
address = connect_to;
1069
ret = start_mandos_communication(address, port, if_index, &mc);
1071
exitcode = EXIT_FAILURE;
1073
exitcode = EXIT_SUCCESS;
1079
avahi_set_log_function(empty_log);
1082
/* Initialize the pseudo-RNG for Avahi */
1083
srand((unsigned int) time(NULL));
1085
/* Allocate main Avahi loop object */
1086
mc.simple_poll = avahi_simple_poll_new();
1087
if(mc.simple_poll == NULL) {
1088
fprintf(stderr, "Avahi: Failed to create simple poll"
1090
exitcode = EXIT_FAILURE;
1095
AvahiServerConfig config;
1096
/* Do not publish any local Zeroconf records */
1097
avahi_server_config_init(&config);
1098
config.publish_hinfo = 0;
1099
config.publish_addresses = 0;
1100
config.publish_workstation = 0;
1101
config.publish_domain = 0;
1103
/* Allocate a new server */
1104
mc.server = avahi_server_new(avahi_simple_poll_get
1105
(mc.simple_poll), &config, NULL,
1108
/* Free the Avahi configuration data */
1109
avahi_server_config_free(&config);
1112
/* Check if creating the Avahi server object succeeded */
1113
if(mc.server == NULL) {
1114
fprintf(stderr, "Failed to create Avahi server: %s\n",
1115
avahi_strerror(error));
1116
exitcode = EXIT_FAILURE;
1120
/* Create the Avahi service browser */
1121
sb = avahi_s_service_browser_new(mc.server, if_index,
1123
"_mandos._tcp", NULL, 0,
1124
browse_callback, &mc);
1126
fprintf(stderr, "Failed to create service browser: %s\n",
1127
avahi_strerror(avahi_server_errno(mc.server)));
1128
exitcode = EXIT_FAILURE;
1132
/* Run the main loop */
1135
fprintf(stderr, "Starting Avahi loop search\n");
2011
perror_plus("klogctl");
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2017
/* Lower privileges */
2020
perror_plus("seteuid");
2028
ret = init_gnutls_global(pubkey, seckey);
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
exitcode = EX_UNAVAILABLE;
2034
gnutls_initialized = true;
2041
if(mkdtemp(tempdir) == NULL){
2042
perror_plus("mkdtemp");
2045
tempdir_created = true;
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2053
exitcode = EX_UNAVAILABLE;
2056
gpgme_initialized = true;
2063
if(connect_to != NULL){
2064
/* Connect directly, do not use Zeroconf */
2065
/* (Mainly meant for debugging) */
2066
char *address = strrchr(connect_to, ':');
2067
if(address == NULL){
2068
fprintf_plus(stderr, "No colon in address\n");
2069
exitcode = EX_USAGE;
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2081
or tmpmax != (uint16_t)tmpmax){
2082
fprintf_plus(stderr, "Bad port number\n");
2083
exitcode = EX_USAGE;
2091
port = (uint16_t)tmpmax;
2093
/* Colon in address indicates IPv6 */
2095
if(strchr(connect_to, ':') != NULL){
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2106
address = connect_to;
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
(int)retry_interval);
2121
sleep((int)retry_interval);
2125
exitcode = EXIT_SUCCESS;
2136
AvahiServerConfig config;
2137
/* Do not publish any local Zeroconf records */
2138
avahi_server_config_init(&config);
2139
config.publish_hinfo = 0;
2140
config.publish_addresses = 0;
2141
config.publish_workstation = 0;
2142
config.publish_domain = 0;
2144
/* Allocate a new server */
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2149
/* Free the Avahi configuration data */
2150
avahi_server_config_free(&config);
2153
/* Check if creating the Avahi server object succeeded */
2154
if(mc.server == NULL){
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2157
exitcode = EX_UNAVAILABLE;
2165
/* Create the Avahi service browser */
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2168
NULL, 0, browse_callback, NULL);
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
avahi_strerror(avahi_server_errno(mc.server)));
2172
exitcode = EX_UNAVAILABLE;
2180
/* Run the main loop */
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
1138
avahi_simple_poll_loop(mc.simple_poll);
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
(ret == 0) ? "successfully" : "with error");
1143
fprintf(stderr, "%s exiting\n", argv[0]);
1146
/* Cleanup things */
1148
avahi_s_service_browser_free(sb);
1150
if(mc.server != NULL)
1151
avahi_server_free(mc.server);
1153
if(mc.simple_poll != NULL)
1154
avahi_simple_poll_free(mc.simple_poll);
1156
if(gnutls_initalized){
1157
gnutls_certificate_free_credentials(mc.cred);
1158
gnutls_global_deinit();
1159
gnutls_dh_params_deinit(mc.dh_params);
1162
if(gpgme_initalized){
1163
gpgme_release(mc.ctx);
1166
/* Removes the temp directory used by GPGME */
1167
if(tempdir[0] != '\0'){
1169
struct dirent *direntry;
1170
d = opendir(tempdir);
1172
if(errno != ENOENT){
1177
direntry = readdir(d);
1178
if(direntry == NULL){
1181
if(direntry->d_type == DT_REG){
1182
char *fullname = NULL;
1183
ret = asprintf(&fullname, "%s/%s", tempdir,
1189
ret = unlink(fullname);
1191
fprintf(stderr, "unlink(\"%s\"): %s",
1192
fullname, strerror(errno));
1199
ret = rmdir(tempdir);
1200
if(ret == -1 and errno != ENOENT){
2196
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2199
/* Cleanup things */
2201
avahi_s_service_browser_free(sb);
2203
if(mc.server != NULL)
2204
avahi_server_free(mc.server);
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2209
if(gnutls_initialized){
2210
gnutls_certificate_free_credentials(mc.cred);
2211
gnutls_global_deinit();
2212
gnutls_dh_params_deinit(mc.dh_params);
2215
if(gpgme_initialized){
2216
gpgme_release(mc.ctx);
2219
/* Cleans up the circular linked list of Mandos servers the client
2221
if(mc.current_server != NULL){
2222
mc.current_server->prev->next = NULL;
2223
while(mc.current_server != NULL){
2224
server *next = mc.current_server->next;
2225
free(mc.current_server);
2226
mc.current_server = next;
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2233
/* Re-raise priviliges */
2238
perror_plus("seteuid");
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2255
perror_plus("close");
2259
/* Lower privileges permanently */
2263
perror_plus("setuid");
2266
/* Removes the GPGME temp directory and all files inside */
2267
if(tempdir_created){
2268
struct dirent **direntries = NULL;
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
2275
char *fullname = NULL;
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
perror_plus("asprintf");
2282
ret = remove(fullname);
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2291
/* need to clean even if 0 because man page doesn't specify */
2293
if (numentries == -1){
2294
perror_plus("scandir");
2296
ret = rmdir(tempdir);
2297
if(ret == -1 and errno != ENOENT){
2298
perror_plus("rmdir");
2303
sigemptyset(&old_sigterm_action.sa_mask);
2304
old_sigterm_action.sa_handler = SIG_DFL;
2305
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2306
&old_sigterm_action,
2309
perror_plus("sigaction");
2312
ret = raise(signal_received);
2313
} while(ret != 0 and errno == EINTR);
2315
perror_plus("raise");
2318
TEMP_FAILURE_RETRY(pause());