812
1158
case AVAHI_BROWSER_ALL_FOR_NOW:
813
1159
case AVAHI_BROWSER_CACHE_EXHAUSTED:
815
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
fprintf_plus(stderr, "No Mandos server found, still"
1168
/* Signal handler that stops main loop after SIGTERM */
1169
static void handle_sigterm(int sig){
1174
signal_received = sig;
1175
int old_errno = errno;
1176
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1183
__attribute__((nonnull, warn_unused_result))
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
perror_plus("socket");
1195
strcpy(ifr->ifr_name, ifname);
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1200
perror_plus("ioctl SIOCGIFFLAGS");
1208
__attribute__((nonnull, warn_unused_result))
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
/* Reject the loopback device */
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1219
/* Accept point-to-point devices only if connect_to is specified */
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1227
/* Otherwise, reject non-broadcast-capable devices */
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
if(ifr->ifr_flags & IFF_NOARP){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1244
/* Accept this device */
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1252
* This function determines if a directory entry in /sys/class/net
1253
* corresponds to an acceptable network device.
1254
* (This function is passed to scandir(3) as a filter function.)
1256
__attribute__((nonnull, warn_unused_result))
1257
int good_interface(const struct dirent *if_entry){
1258
if(if_entry->d_name[0] == '.'){
1263
if(not get_flags(if_entry->d_name, &ifr)){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1271
if(not good_flags(if_entry->d_name, &ifr)){
1278
* This function determines if a network interface is up.
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1283
if(not get_flags(interface, &ifr)){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1295
* This function determines if a network interface is running
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1300
if(not get_flags(interface, &ifr)){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
__attribute__((nonnull, pure, warn_unused_result))
1312
int notdotentries(const struct dirent *direntry){
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
int runnable_hook(const struct dirent *direntry){
1330
if((direntry->d_name)[0] == '\0'){
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
perror_plus("asprintf");
1355
ret = stat(fullname, &st);
1358
perror_plus("Could not stat hook");
1362
if(not (S_ISREG(st.st_mode))){
1363
/* Not a regular file */
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1370
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1371
/* Not executable */
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1389
struct timespec now;
1390
struct timespec waited_time;
1391
intmax_t block_time;
1394
if(mc->current_server == NULL){
1396
fprintf_plus(stderr, "Wait until first server is found."
1399
ret = avahi_simple_poll_iterate(s, -1);
1402
fprintf_plus(stderr, "Check current_server if we should run"
1405
/* the current time */
1406
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1408
perror_plus("clock_gettime");
1411
/* Calculating in ms how long time between now and server
1412
who we visted longest time ago. Now - last seen. */
1413
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1415
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1417
/* total time is 10s/10,000ms.
1418
Converting to s from ms by dividing by 1,000,
1419
and ns to ms by dividing by 1,000,000. */
1420
block_time = ((retry_interval
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1429
if(block_time <= 0){
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1435
avahi_simple_poll_quit(s);
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1441
perror_plus("clock_gettime");
1444
mc->current_server = mc->current_server->next;
1445
block_time = 0; /* Call avahi to find new Mandos
1446
servers, but don't block */
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1452
if(ret > 0 or errno != EINTR){
1453
return (ret != 1) ? ret : 0;
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1466
perror_plus("seteuid");
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1481
if(setuid(0) == -1){
1483
perror_plus("seteuid");
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1496
perror_plus("seteuid");
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1509
perror_plus("setuid");
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1522
if(errno == ENOENT){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1528
perror_plus("scandir");
1531
struct dirent *direntry;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1539
perror_plus("asprintf");
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1546
pid_t hook_pid = fork();
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1558
perror_plus("setgid");
1561
/* Reset supplementary groups */
1563
ret = setgroups(0, NULL);
1565
perror_plus("setgroups");
1568
ret = dup2(devnull, STDIN_FILENO);
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1573
ret = close(devnull);
1575
perror_plus("close");
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
perror_plus("setenv");
1588
ret = setenv("DEVICE", interface, 1);
1590
perror_plus("setenv");
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1595
perror_plus("setenv");
1598
ret = setenv("MODE", mode, 1);
1600
perror_plus("setenv");
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1606
perror_plus("asprintf");
1609
ret = setenv("DELAY", delaystring, 1);
1612
perror_plus("setenv");
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1619
perror_plus("setenv");
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1668
error_t old_errno = errno;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1692
network.ifr_flags |= IFF_UP; /* set flag */
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1697
perror_plus("socket");
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
perror_plus("close");
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1719
perror_plus("Failed to raise privileges");
1724
bool restore_loglevel = false;
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1732
restore_loglevel = true;
1735
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1739
if(restore_loglevel){
1740
ret_linux = klogctl(7, NULL, 0);
1741
if(ret_linux == -1){
1742
perror_plus("klogctl");
1745
#endif /* __linux__ */
1747
/* If raise_privileges() succeeded above */
1749
/* Lower privileges */
1750
ret_errno = lower_privileges();
1753
perror_plus("Failed to lower privileges");
1757
/* Close the socket */
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1760
perror_plus("close");
1763
if(ret_setflags == -1){
1764
errno = ioctl_errno;
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1774
/* Sleep checking until interface is running.
1775
Check every 0.25s, up to total time of delay */
1776
for(int i=0; i < delay * 4; i++){
1777
if(interface_is_running(interface)){
1780
struct timespec sleeptime = { .tv_nsec = 250000000 };
1781
ret = nanosleep(&sleeptime, NULL);
1782
if(ret == -1 and errno != EINTR){
1783
perror_plus("nanosleep");
1791
__attribute__((nonnull, warn_unused_result))
1792
error_t take_down_interface(const char *const interface){
1793
error_t old_errno = errno;
1794
struct ifreq network;
1795
unsigned int if_index = if_nametoindex(interface);
1797
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
if(not get_flags(interface, &network) and debug){
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1806
"\"%s\"\n", interface);
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1815
perror_plus("socket");
1821
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1828
perror_plus("Failed to raise privileges");
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1834
/* If raise_privileges() succeeded above */
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1840
perror_plus("Failed to lower privileges");
1844
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1847
perror_plus("close");
1850
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
821
1865
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);
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);
949
perror("ioctl SIOCSIFFLAGS");
950
exitcode = EXIT_FAILURE;
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);
1024
exitcode = EXIT_FAILURE;
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 */
1866
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1870
AvahiSServiceBrowser *sb = NULL;
1875
int exitcode = EXIT_SUCCESS;
1876
char *interfaces_to_take_down = NULL;
1877
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
1881
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1882
const char *seckey = PATHDIR "/" SECKEY;
1883
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1886
bool gnutls_initialized = false;
1887
bool gpgme_initialized = false;
1889
double retry_interval = 10; /* 10s between trying a server and
1890
retrying the same server again */
1892
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1893
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1898
/* Lower any group privileges we might have, just to be safe */
1902
perror_plus("setgid");
1905
/* Lower user privileges (temporarily) */
1909
perror_plus("seteuid");
1917
struct argp_option options[] = {
1918
{ .name = "debug", .key = 128,
1919
.doc = "Debug mode", .group = 3 },
1920
{ .name = "connect", .key = 'c',
1921
.arg = "ADDRESS:PORT",
1922
.doc = "Connect directly to a specific Mandos server",
1924
{ .name = "interface", .key = 'i',
1926
.doc = "Network interface that will be used to search for"
1929
{ .name = "seckey", .key = 's',
1931
.doc = "OpenPGP secret key file base name",
1933
{ .name = "pubkey", .key = 'p',
1935
.doc = "OpenPGP public key file base name",
1937
{ .name = "dh-bits", .key = 129,
1939
.doc = "Bit length of the prime number used in the"
1940
" Diffie-Hellman key exchange",
1942
{ .name = "priority", .key = 130,
1944
.doc = "GnuTLS priority string for the TLS handshake",
1946
{ .name = "delay", .key = 131,
1948
.doc = "Maximum delay to wait for interface startup",
1950
{ .name = "retry", .key = 132,
1952
.doc = "Retry interval used when denied by the Mandos server",
1954
{ .name = "network-hook-dir", .key = 133,
1956
.doc = "Directory where network hooks are located",
1959
* These reproduce what we would get without ARGP_NO_HELP
1961
{ .name = "help", .key = '?',
1962
.doc = "Give this help list", .group = -1 },
1963
{ .name = "usage", .key = -3,
1964
.doc = "Give a short usage message", .group = -1 },
1965
{ .name = "version", .key = 'V',
1966
.doc = "Print program version", .group = -1 },
1970
error_t parse_opt(int key, char *arg,
1971
struct argp_state *state){
1974
case 128: /* --debug */
1977
case 'c': /* --connect */
1980
case 'i': /* --interface */
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1984
argp_error(state, "%s", strerror(ret_errno));
1987
case 's': /* --seckey */
1990
case 'p': /* --pubkey */
1993
case 129: /* --dh-bits */
1995
tmpmax = strtoimax(arg, &tmp, 10);
1996
if(errno != 0 or tmp == arg or *tmp != '\0'
1997
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1998
argp_error(state, "Bad number of DH bits");
2000
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2002
case 130: /* --priority */
2005
case 131: /* --delay */
2007
delay = strtof(arg, &tmp);
2008
if(errno != 0 or tmp == arg or *tmp != '\0'){
2009
argp_error(state, "Bad delay");
2011
case 132: /* --retry */
2013
retry_interval = strtod(arg, &tmp);
2014
if(errno != 0 or tmp == arg or *tmp != '\0'
2015
or (retry_interval * 1000) > INT_MAX
2016
or retry_interval < 0){
2017
argp_error(state, "Bad retry interval");
2020
case 133: /* --network-hook-dir */
2024
* These reproduce what we would get without ARGP_NO_HELP
2026
case '?': /* --help */
2027
argp_state_help(state, state->out_stream,
2028
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2029
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2030
case -3: /* --usage */
2031
argp_state_help(state, state->out_stream,
2032
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2033
case 'V': /* --version */
2034
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2035
exit(argp_err_exit_status);
2038
return ARGP_ERR_UNKNOWN;
2043
struct argp argp = { .options = options, .parser = parse_opt,
2045
.doc = "Mandos client -- Get and decrypt"
2046
" passwords from a Mandos server" };
2047
ret = argp_parse(&argp, argc, argv,
2048
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2055
perror_plus("argp_parse");
2056
exitcode = EX_OSERR;
2059
exitcode = EX_USAGE;
2065
/* Work around Debian bug #633582:
2066
<http://bugs.debian.org/633582> */
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2072
perror_plus("Failed to raise privileges");
2076
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2077
int seckey_fd = open(seckey, O_RDONLY);
2078
if(seckey_fd == -1){
2079
perror_plus("open");
2081
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2083
perror_plus("fstat");
2085
if(S_ISREG(st.st_mode)
2086
and st.st_uid == 0 and st.st_gid == 0){
2087
ret = fchown(seckey_fd, uid, gid);
2089
perror_plus("fchown");
2093
TEMP_FAILURE_RETRY(close(seckey_fd));
2097
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2098
int pubkey_fd = open(pubkey, O_RDONLY);
2099
if(pubkey_fd == -1){
2100
perror_plus("open");
2102
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2104
perror_plus("fstat");
2106
if(S_ISREG(st.st_mode)
2107
and st.st_uid == 0 and st.st_gid == 0){
2108
ret = fchown(pubkey_fd, uid, gid);
2110
perror_plus("fchown");
2114
TEMP_FAILURE_RETRY(close(pubkey_fd));
2118
/* Lower privileges */
2119
ret_errno = lower_privileges();
2122
perror_plus("Failed to lower privileges");
2127
/* Remove invalid interface names (except "none") */
2129
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2136
" \"%s\"\n", interface);
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2144
/* Run network hooks */
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2148
if(interfaces_hooks == NULL){
2149
perror_plus("malloc");
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
2160
avahi_set_log_function(empty_log);
2163
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2164
from the signal handler */
2165
/* Initialize the pseudo-RNG for Avahi */
2166
srand((unsigned int) time(NULL));
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
2169
fprintf_plus(stderr,
2170
"Avahi: Failed to create simple poll object.\n");
2171
exitcode = EX_UNAVAILABLE;
2175
sigemptyset(&sigterm_action.sa_mask);
2176
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2178
perror_plus("sigaddset");
2179
exitcode = EX_OSERR;
2182
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2184
perror_plus("sigaddset");
2185
exitcode = EX_OSERR;
2188
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2190
perror_plus("sigaddset");
2191
exitcode = EX_OSERR;
2194
/* Need to check if the handler is SIG_IGN before handling:
2195
| [[info:libc:Initial Signal Actions]] |
2196
| [[info:libc:Basic Signal Handling]] |
2198
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2200
perror_plus("sigaction");
2203
if(old_sigterm_action.sa_handler != SIG_IGN){
2204
ret = sigaction(SIGINT, &sigterm_action, NULL);
2206
perror_plus("sigaction");
2207
exitcode = EX_OSERR;
2211
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2213
perror_plus("sigaction");
2216
if(old_sigterm_action.sa_handler != SIG_IGN){
2217
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2219
perror_plus("sigaction");
2220
exitcode = EX_OSERR;
2224
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2226
perror_plus("sigaction");
2229
if(old_sigterm_action.sa_handler != SIG_IGN){
2230
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2232
perror_plus("sigaction");
2233
exitcode = EX_OSERR;
2238
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2240
struct dirent **direntries;
2241
/* Look for any good interfaces */
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2245
/* Add all found interfaces to interfaces list */
2246
for(int i = 0; i < ret; ++i){
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2248
direntries[i]->d_name);
2251
perror_plus("argz_add");
2255
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2256
direntries[i]->d_name);
2262
fprintf_plus(stderr, "Could not find a network interface\n");
2263
exitcode = EXIT_FAILURE;
2268
/* Bring up interfaces which are down, and remove any "none"s */
2270
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2289
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2291
if(not interface_was_up){
2293
perror_plus("Failed to bring up interface");
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2299
perror_plus("argz_add");
2304
if(debug and (interfaces_to_take_down == NULL)){
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
1088
fprintf(stderr, "Starting Avahi loop search\n");
1091
avahi_simple_poll_loop(mc.simple_poll);
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
2324
fprintf_plus(stderr, "init_gnutls_global failed\n");
2325
exitcode = EX_UNAVAILABLE;
2328
gnutls_initialized = true;
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2342
tempdir = mkdtemp(old_tempdir);
2344
if(tempdir == NULL){
2345
perror_plus("mkdtemp");
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2354
fprintf_plus(stderr, "init_gpgme failed\n");
2355
exitcode = EX_UNAVAILABLE;
2358
gpgme_initialized = true;
2365
if(connect_to != NULL){
2366
/* Connect directly, do not use Zeroconf */
2367
/* (Mainly meant for debugging) */
2368
char *address = strrchr(connect_to, ':');
2370
if(address == NULL){
2371
fprintf_plus(stderr, "No colon in address\n");
2372
exitcode = EX_USAGE;
2382
tmpmax = strtoimax(address+1, &tmp, 10);
2383
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2384
or tmpmax != (in_port_t)tmpmax){
2385
fprintf_plus(stderr, "Bad port number\n");
2386
exitcode = EX_USAGE;
2394
port = (in_port_t)tmpmax;
2396
/* Colon in address indicates IPv6 */
2398
if(strchr(connect_to, ':') != NULL){
2400
/* Accept [] around IPv6 address - see RFC 5952 */
2401
if(connect_to[0] == '[' and address[-1] == ']')
2409
address = connect_to;
2415
while(not quit_now){
2416
ret = start_mandos_communication(address, port, if_index, af,
2418
if(quit_now or ret == 0){
2422
fprintf_plus(stderr, "Retrying in %d seconds\n",
2423
(int)retry_interval);
2425
sleep((unsigned int)retry_interval);
2429
exitcode = EXIT_SUCCESS;
2440
AvahiServerConfig config;
2441
/* Do not publish any local Zeroconf records */
2442
avahi_server_config_init(&config);
2443
config.publish_hinfo = 0;
2444
config.publish_addresses = 0;
2445
config.publish_workstation = 0;
2446
config.publish_domain = 0;
2448
/* Allocate a new server */
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
2452
/* Free the Avahi configuration data */
2453
avahi_server_config_free(&config);
2456
/* Check if creating the Avahi server object succeeded */
2457
if(mc.server == NULL){
2458
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2459
avahi_strerror(ret_errno));
2460
exitcode = EX_UNAVAILABLE;
2468
/* Create the Avahi service browser */
2469
sb = avahi_s_service_browser_new(mc.server, if_index,
2470
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2471
NULL, 0, browse_callback,
2474
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2475
avahi_strerror(avahi_server_errno(mc.server)));
2476
exitcode = EX_UNAVAILABLE;
2484
/* Run the main loop */
2487
fprintf_plus(stderr, "Starting Avahi loop search\n");
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2493
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2494
(ret == 0) ? "successfully" : "with error");
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){
2500
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2503
/* Cleanup things */
2504
free(mc.interfaces);
2507
avahi_s_service_browser_free(sb);
2509
if(mc.server != NULL)
2510
avahi_server_free(mc.server);
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
2515
if(gnutls_initialized){
2516
gnutls_certificate_free_credentials(mc.cred);
2517
gnutls_global_deinit();
2518
gnutls_dh_params_deinit(mc.dh_params);
2521
if(gpgme_initialized){
2522
gpgme_release(mc.ctx);
2525
/* Cleans up the circular linked list of Mandos servers the client
2527
if(mc.current_server != NULL){
2528
mc.current_server->prev->next = NULL;
2529
while(mc.current_server != NULL){
2530
server *next = mc.current_server->next;
2531
free(mc.current_server);
2532
mc.current_server = next;
2536
/* Re-raise privileges */
2538
ret_errno = raise_privileges();
2540
perror_plus("Failed to raise privileges");
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2547
/* Take down the network interfaces which were brought up */
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2553
ret_errno = take_down_interface(interface);
2556
perror_plus("Failed to take down interface");
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2566
ret_errno = lower_privileges_permanently();
2568
perror_plus("Failed to lower privileges permanently");
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2575
/* Removes the GPGME temp directory and all files inside */
2576
if(tempdir != NULL){
2577
struct dirent **direntries = NULL;
2578
struct dirent *direntry = NULL;
2579
int numentries = scandir(tempdir, &direntries, notdotentries,
2582
for(int i = 0; i < numentries; i++){
2583
direntry = direntries[i];
2584
char *fullname = NULL;
2585
ret = asprintf(&fullname, "%s/%s", tempdir,
2588
perror_plus("asprintf");
2591
ret = remove(fullname);
2593
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2600
/* need to clean even if 0 because man page doesn't specify */
2602
if(numentries == -1){
2603
perror_plus("scandir");
2605
ret = rmdir(tempdir);
2606
if(ret == -1 and errno != ENOENT){
2607
perror_plus("rmdir");
2612
sigemptyset(&old_sigterm_action.sa_mask);
2613
old_sigterm_action.sa_handler = SIG_DFL;
2614
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2615
&old_sigterm_action,
2618
perror_plus("sigaction");
2621
ret = raise(signal_received);
2622
} while(ret != 0 and errno == EINTR);
2624
perror_plus("raise");
2627
TEMP_FAILURE_RETRY(pause());