340
480
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
481
gnutls_certificate_allocate_credentials(&mc.cred);
482
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
356
498
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
358
500
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
501
if(ret != GNUTLS_E_SUCCESS){
361
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
505
fprintf(stderr, "The GnuTLS error is: %s\n",
364
506
safer_gnutls_strerror(ret));
368
510
/* GnuTLS server initialization */
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
388
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
389
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
536
static int init_gnutls_session(gnutls_session_t *session){
397
538
/* GnuTLS session creation */
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
540
ret = gnutls_init(session, GNUTLS_SERVER);
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
if(ret != GNUTLS_E_SUCCESS){
400
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
547
safer_gnutls_strerror(ret));
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
555
gnutls_deinit(*session);
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
if(ret != GNUTLS_E_SUCCESS){
408
560
fprintf(stderr, "Syntax error at: %s\n", err);
409
561
fprintf(stderr, "GnuTLS error: %s\n",
410
562
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
563
gnutls_deinit(*session);
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
if (ret != GNUTLS_E_SUCCESS) {
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
gnutls_deinit(*session);
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
if(ret != GNUTLS_E_SUCCESS){
419
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
578
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
579
gnutls_deinit(*session);
425
583
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
1072
/* Signal handler that stops main loop after sigterm has been called */
1073
static void handle_sigterm(int sig){
1078
signal_received = sig;
1079
int old_errno = errno;
1080
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1092
int good_interface(const struct dirent *if_entry){
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1101
perror_plus("asprintf");
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
perror_plus("open");
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1125
perror_plus("read");
752
int ret = asprintf(&tmp, "%s/%s", first, second);
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1184
/* Accept this device */
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1210
if(mc.current_server == NULL){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1214
ret = avahi_simple_poll_iterate(s, -1);
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1219
/* the current time */
1220
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1222
perror_plus("clock_gettime");
1225
/* Calculating in ms how long time between now and server
1226
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1236
if(block_time <= 0){
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1242
avahi_simple_poll_quit(mc.simple_poll);
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1247
perror_plus("clock_gettime");
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1254
ret = avahi_simple_poll_iterate(s, (int)block_time);
1257
if (ret > 0 or errno != EINTR) {
1258
return (ret != 1) ? ret : 0;
760
1264
int main(int argc, char *argv[]){
761
AvahiSServiceBrowser *sb = NULL;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
786
.doc = "Connect directly to a sepcified mandos server",
788
{ .name = "interface", .key = 'i',
790
.doc = "Interface that Avahi will conntect through",
792
{ .name = "keydir", .key = 'd',
794
.doc = "Directory where the openpgp keyring is",
796
{ .name = "seckey", .key = 's',
798
.doc = "Secret openpgp key for gnutls authentication",
800
{ .name = "pubkey", .key = 'p',
802
.doc = "Public openpgp key for gnutls authentication",
804
{ .name = "dh-bits", .key = 129,
806
.doc = "dh-bits to use in gnutls communication",
808
{ .name = "priority", .key = 130,
810
.doc = "GNUTLS priority", .group = 1 },
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
854
return ARGP_ERR_UNKNOWN;
859
struct argp argp = { .options = options, .parser = parse_opt,
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
1265
AvahiSServiceBrowser *sb = NULL;
1270
int exitcode = EXIT_SUCCESS;
1271
const char *interface = "";
1272
struct ifreq network;
1274
bool take_down_interface = false;
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1278
bool tempdir_created = false;
1279
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1280
const char *seckey = PATHDIR "/" SECKEY;
1281
const char *pubkey = PATHDIR "/" PUBKEY;
1283
bool gnutls_initialized = false;
1284
bool gpgme_initialized = false;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
1288
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1294
/* Lower any group privileges we might have, just to be safe */
1298
perror_plus("setgid");
1301
/* Lower user privileges (temporarily) */
1305
perror_plus("seteuid");
1313
struct argp_option options[] = {
1314
{ .name = "debug", .key = 128,
1315
.doc = "Debug mode", .group = 3 },
1316
{ .name = "connect", .key = 'c',
1317
.arg = "ADDRESS:PORT",
1318
.doc = "Connect directly to a specific Mandos server",
1320
{ .name = "interface", .key = 'i',
1322
.doc = "Network interface that will be used to search for"
1325
{ .name = "seckey", .key = 's',
1327
.doc = "OpenPGP secret key file base name",
1329
{ .name = "pubkey", .key = 'p',
1331
.doc = "OpenPGP public key file base name",
1333
{ .name = "dh-bits", .key = 129,
1335
.doc = "Bit length of the prime number used in the"
1336
" Diffie-Hellman key exchange",
1338
{ .name = "priority", .key = 130,
1340
.doc = "GnuTLS priority string for the TLS handshake",
1342
{ .name = "delay", .key = 131,
1344
.doc = "Maximum delay to wait for interface startup",
1346
{ .name = "retry", .key = 132,
1348
.doc = "Retry interval used when denied by the mandos server",
1351
* These reproduce what we would get without ARGP_NO_HELP
1353
{ .name = "help", .key = '?',
1354
.doc = "Give this help list", .group = -1 },
1355
{ .name = "usage", .key = -3,
1356
.doc = "Give a short usage message", .group = -1 },
1357
{ .name = "version", .key = 'V',
1358
.doc = "Print program version", .group = -1 },
1362
error_t parse_opt(int key, char *arg,
1363
struct argp_state *state){
1366
case 128: /* --debug */
1369
case 'c': /* --connect */
1372
case 'i': /* --interface */
1375
case 's': /* --seckey */
1378
case 'p': /* --pubkey */
1381
case 129: /* --dh-bits */
1383
tmpmax = strtoimax(arg, &tmp, 10);
1384
if(errno != 0 or tmp == arg or *tmp != '\0'
1385
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1386
argp_error(state, "Bad number of DH bits");
1388
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1390
case 130: /* --priority */
1393
case 131: /* --delay */
1395
delay = strtof(arg, &tmp);
1396
if(errno != 0 or tmp == arg or *tmp != '\0'){
1397
argp_error(state, "Bad delay");
1399
case 132: /* --retry */
1401
retry_interval = strtod(arg, &tmp);
1402
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
1404
argp_error(state, "Bad retry interval");
1408
* These reproduce what we would get without ARGP_NO_HELP
1410
case '?': /* --help */
1411
argp_state_help(state, state->out_stream,
1412
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1413
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1414
case -3: /* --usage */
1415
argp_state_help(state, state->out_stream,
1416
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
1419
exit(argp_err_exit_status);
1422
return ARGP_ERR_UNKNOWN;
1427
struct argp argp = { .options = options, .parser = parse_opt,
1429
.doc = "Mandos client -- Get and decrypt"
1430
" passwords from a Mandos server" };
1431
ret = argp_parse(&argp, argc, argv,
1432
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1439
perror_plus("argp_parse");
1440
exitcode = EX_OSERR;
1443
exitcode = EX_USAGE;
1449
avahi_set_log_function(empty_log);
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1462
if(interface == NULL){
1463
perror_plus("malloc");
866
1465
exitcode = EXIT_FAILURE;
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
891
gnutls_initalized = true;
894
/* If the interface is down, bring it up */
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
exitcode = EXIT_FAILURE;
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1477
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1478
from the signal handler */
1479
/* Initialize the pseudo-RNG for Avahi */
1480
srand((unsigned int) time(NULL));
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1484
exitcode = EX_UNAVAILABLE;
1488
sigemptyset(&sigterm_action.sa_mask);
1489
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1491
perror_plus("sigaddset");
1492
exitcode = EX_OSERR;
1495
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1497
perror_plus("sigaddset");
1498
exitcode = EX_OSERR;
1501
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1503
perror_plus("sigaddset");
1504
exitcode = EX_OSERR;
1507
/* Need to check if the handler is SIG_IGN before handling:
1508
| [[info:libc:Initial Signal Actions]] |
1509
| [[info:libc:Basic Signal Handling]] |
1511
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1513
perror_plus("sigaction");
1516
if(old_sigterm_action.sa_handler != SIG_IGN){
1517
ret = sigaction(SIGINT, &sigterm_action, NULL);
1519
perror_plus("sigaction");
1520
exitcode = EX_OSERR;
1524
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1526
perror_plus("sigaction");
1529
if(old_sigterm_action.sa_handler != SIG_IGN){
1530
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1532
perror_plus("sigaction");
1533
exitcode = EX_OSERR;
1537
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1539
perror_plus("sigaction");
1542
if(old_sigterm_action.sa_handler != SIG_IGN){
1543
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1545
perror_plus("sigaction");
1546
exitcode = EX_OSERR;
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
934
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
1554
if(if_index == 0){
936
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
960
exitcode = EXIT_FAILURE;
962
exitcode = EXIT_SUCCESS;
968
avahi_set_log_function(empty_log);
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
979
exitcode = EXIT_FAILURE;
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1021
/* Run the main loop */
1024
fprintf(stderr, "Starting Avahi loop search\n");
1027
avahi_simple_poll_loop(mc.simple_poll);
1556
exitcode = EX_UNAVAILABLE;
1564
/* Re-raise priviliges */
1568
perror_plus("seteuid");
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1580
#endif /* __linux__ */
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1590
perror_plus("klogctl");
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1598
perror_plus("seteuid");
1602
strcpy(network.ifr_name, interface);
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1605
perror_plus("ioctl SIOCGIFFLAGS");
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1610
perror_plus("klogctl");
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1619
perror_plus("seteuid");
1623
if((network.ifr_flags & IFF_UP) == 0){
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1635
perror_plus("klogctl");
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1643
perror_plus("seteuid");
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
perror_plus("close");
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1674
perror_plus("klogctl");
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1680
if(take_down_interface){
1681
/* Lower privileges */
1684
perror_plus("seteuid");
1687
/* Lower privileges permanently */
1690
perror_plus("setuid");
1699
ret = init_gnutls_global(pubkey, seckey);
1701
fprintf(stderr, "init_gnutls_global failed\n");
1702
exitcode = EX_UNAVAILABLE;
1705
gnutls_initialized = true;
1712
if(mkdtemp(tempdir) == NULL){
1713
perror_plus("mkdtemp");
1716
tempdir_created = true;
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
1724
exitcode = EX_UNAVAILABLE;
1727
gpgme_initialized = true;
1734
if(connect_to != NULL){
1735
/* Connect directly, do not use Zeroconf */
1736
/* (Mainly meant for debugging) */
1737
char *address = strrchr(connect_to, ':');
1738
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
1740
exitcode = EX_USAGE;
1750
tmpmax = strtoimax(address+1, &tmp, 10);
1751
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
1754
exitcode = EX_USAGE;
1762
port = (uint16_t)tmpmax;
1764
address = connect_to;
1765
/* Colon in address indicates IPv6 */
1767
if(strchr(address, ':') != NULL){
1777
while(not quit_now){
1778
ret = start_mandos_communication(address, port, if_index, af);
1779
if(quit_now or ret == 0){
1782
sleep((int)retry_interval or 1);
1786
exitcode = EXIT_SUCCESS;
1797
AvahiServerConfig config;
1798
/* Do not publish any local Zeroconf records */
1799
avahi_server_config_init(&config);
1800
config.publish_hinfo = 0;
1801
config.publish_addresses = 0;
1802
config.publish_workstation = 0;
1803
config.publish_domain = 0;
1805
/* Allocate a new server */
1806
mc.server = avahi_server_new(avahi_simple_poll_get
1807
(mc.simple_poll), &config, NULL,
1810
/* Free the Avahi configuration data */
1811
avahi_server_config_free(&config);
1814
/* Check if creating the Avahi server object succeeded */
1815
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
1818
exitcode = EX_UNAVAILABLE;
1826
/* Create the Avahi service browser */
1827
sb = avahi_s_service_browser_new(mc.server, if_index,
1828
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
NULL, 0, browse_callback, NULL);
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
1833
exitcode = EX_UNAVAILABLE;
1841
/* Run the main loop */
1844
fprintf(stderr, "Starting Avahi loop search\n");
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1035
/* Cleanup things */
1037
avahi_s_service_browser_free(sb);
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1856
fprintf(stderr, "%s exiting\n", argv[0]);
1859
/* Cleanup things */
1861
avahi_s_service_browser_free(sb);
1863
if(mc.server != NULL)
1864
avahi_server_free(mc.server);
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
1869
if(gnutls_initialized){
1870
gnutls_certificate_free_credentials(mc.cred);
1871
gnutls_global_deinit();
1872
gnutls_dh_params_deinit(mc.dh_params);
1875
if(gpgme_initialized){
1876
gpgme_release(mc.ctx);
1879
/* cleans up the circular linked list of mandos servers the client has seen */
1880
if(mc.current_server != NULL){
1881
mc.current_server->prev->next = NULL;
1882
while(mc.current_server != NULL){
1883
server *next = mc.current_server->next;
1884
free(mc.current_server);
1885
mc.current_server = next;
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1895
perror_plus("seteuid");
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1910
perror_plus("close");
1912
/* Lower privileges permanently */
1916
perror_plus("setuid");
1921
/* Removes the GPGME temp directory and all files inside */
1922
if(tempdir_created){
1923
struct dirent **direntries = NULL;
1924
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1927
for(int i = 0; i < ret; i++){
1928
direntry = direntries[i];
1929
char *fullname = NULL;
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
1933
perror_plus("asprintf");
1936
ret = remove(fullname);
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
1948
perror_plus("scandir");
1950
ret = rmdir(tempdir);
1951
if(ret == -1 and errno != ENOENT){
1952
perror_plus("rmdir");
1957
sigemptyset(&old_sigterm_action.sa_mask);
1958
old_sigterm_action.sa_handler = SIG_DFL;
1959
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1960
&old_sigterm_action,
1963
perror_plus("sigaction");
1966
ret = raise(signal_received);
1967
} while(ret != 0 and errno == EINTR);
1969
perror_plus("raise");
1972
TEMP_FAILURE_RETRY(pause());