483
341
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
485
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
498
356
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
500
GNUTLS_OPENPGP_FMT_BASE64);
501
if(ret != GNUTLS_E_SUCCESS){
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
503
360
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
506
363
safer_gnutls_strerror(ret));
510
367
/* GnuTLS server initialization */
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);
368
ret = gnutls_dh_params_init(&mc->dh_params);
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
530
gnutls_certificate_free_credentials(mc.cred);
387
gnutls_certificate_free_credentials(mc->cred);
531
388
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
536
static int init_gnutls_session(gnutls_session_t *session){
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
538
396
/* GnuTLS session creation */
540
ret = gnutls_init(session, GNUTLS_SERVER);
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
if(ret != GNUTLS_E_SUCCESS){
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
546
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
400
safer_gnutls_strerror(ret));
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){
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
560
407
fprintf(stderr, "Syntax error at: %s\n", err);
561
408
fprintf(stderr, "GnuTLS error: %s\n",
562
409
safer_gnutls_strerror(ret));
563
gnutls_deinit(*session);
410
gnutls_deinit (*session);
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){
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
if (ret != GNUTLS_E_SUCCESS) {
577
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
419
safer_gnutls_strerror(ret));
579
gnutls_deinit(*session);
420
gnutls_deinit (*session);
583
424
/* ignore client certificate if any. */
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
425
gnutls_certificate_server_set_request (*session,
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
1072
/* Signal handler that stops main loop after SIGTERM */
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 = 2+(sizeof(ifreq_flags)*2)+1; /* "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");
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){
1213
"Wait until first server is found. No timeout!\n");
1215
ret = avahi_simple_poll_iterate(s, -1);
1218
fprintf(stderr, "Check current_server if we should run it,"
1221
/* the current time */
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
perror_plus("clock_gettime");
1227
/* Calculating in ms how long time between now and server
1228
who we visted longest time ago. Now - last seen. */
1229
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1231
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1233
/* total time is 10s/10,000ms.
1234
Converting to s from ms by dividing by 1,000,
1235
and ns to ms by dividing by 1,000,000. */
1236
block_time = ((retry_interval
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1244
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1250
avahi_simple_poll_quit(mc.simple_poll);
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1256
perror_plus("clock_gettime");
1259
mc.current_server = mc.current_server->next;
1260
block_time = 0; /* Call avahi to find new Mandos
1261
servers, but don't block */
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1267
if (ret > 0 or errno != EINTR) {
1268
return (ret != 1) ? ret : 0;
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
755
memcpy(tmp, first, f_len); /* Spurious warning */
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
761
tmp[f_len + 1 + s_len] = '\0';
1274
766
int main(int argc, char *argv[]){
1275
AvahiSServiceBrowser *sb = NULL;
1280
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1284
bool take_down_interface = false;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
const char *seckey = PATHDIR "/" SECKEY;
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1293
bool gnutls_initialized = false;
1294
bool gpgme_initialized = false;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
1299
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1300
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1305
/* Lower any group privileges we might have, just to be safe */
1309
perror_plus("setgid");
1312
/* Lower user privileges (temporarily) */
1316
perror_plus("seteuid");
1324
struct argp_option options[] = {
1325
{ .name = "debug", .key = 128,
1326
.doc = "Debug mode", .group = 3 },
1327
{ .name = "connect", .key = 'c',
1328
.arg = "ADDRESS:PORT",
1329
.doc = "Connect directly to a specific Mandos server",
1331
{ .name = "interface", .key = 'i',
1333
.doc = "Network interface that will be used to search for"
1336
{ .name = "seckey", .key = 's',
1338
.doc = "OpenPGP secret key file base name",
1340
{ .name = "pubkey", .key = 'p',
1342
.doc = "OpenPGP public key file base name",
1344
{ .name = "dh-bits", .key = 129,
1346
.doc = "Bit length of the prime number used in the"
1347
" Diffie-Hellman key exchange",
1349
{ .name = "priority", .key = 130,
1351
.doc = "GnuTLS priority string for the TLS handshake",
1353
{ .name = "delay", .key = 131,
1355
.doc = "Maximum delay to wait for interface startup",
1357
{ .name = "retry", .key = 132,
1359
.doc = "Retry interval used when denied by the mandos server",
1362
* These reproduce what we would get without ARGP_NO_HELP
1364
{ .name = "help", .key = '?',
1365
.doc = "Give this help list", .group = -1 },
1366
{ .name = "usage", .key = -3,
1367
.doc = "Give a short usage message", .group = -1 },
1368
{ .name = "version", .key = 'V',
1369
.doc = "Print program version", .group = -1 },
1373
error_t parse_opt(int key, char *arg,
1374
struct argp_state *state){
1377
case 128: /* --debug */
1380
case 'c': /* --connect */
1383
case 'i': /* --interface */
1386
case 's': /* --seckey */
1389
case 'p': /* --pubkey */
1392
case 129: /* --dh-bits */
1394
tmpmax = strtoimax(arg, &tmp, 10);
1395
if(errno != 0 or tmp == arg or *tmp != '\0'
1396
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1397
argp_error(state, "Bad number of DH bits");
1399
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1401
case 130: /* --priority */
1404
case 131: /* --delay */
1406
delay = strtof(arg, &tmp);
1407
if(errno != 0 or tmp == arg or *tmp != '\0'){
1408
argp_error(state, "Bad delay");
1410
case 132: /* --retry */
1412
retry_interval = strtod(arg, &tmp);
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1415
argp_error(state, "Bad retry interval");
1419
* These reproduce what we would get without ARGP_NO_HELP
1421
case '?': /* --help */
1422
argp_state_help(state, state->out_stream,
1423
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1424
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1425
case -3: /* --usage */
1426
argp_state_help(state, state->out_stream,
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1430
exit(argp_err_exit_status);
1433
return ARGP_ERR_UNKNOWN;
1438
struct argp argp = { .options = options, .parser = parse_opt,
1440
.doc = "Mandos client -- Get and decrypt"
1441
" passwords from a Mandos server" };
1442
ret = argp_parse(&argp, argc, argv,
1443
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1450
perror_plus("argp_parse");
1451
exitcode = EX_OSERR;
1454
exitcode = EX_USAGE;
1460
avahi_set_log_function(empty_log);
1463
if(interface[0] == '\0'){
1464
struct dirent **direntries;
1465
ret = scandir(sys_class_net, &direntries, good_interface,
1468
/* Pick the first good interface */
1469
interface = strdup(direntries[0]->d_name);
1471
fprintf(stderr, "Using interface \"%s\"\n", interface);
1473
if(interface == NULL){
1474
perror_plus("malloc");
767
AvahiSServiceBrowser *sb = NULL;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
776
char *connect_to = NULL;
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
790
.doc = "Connect directly to a sepcified mandos server",
792
{ .name = "interface", .key = 'i',
794
.doc = "Interface that Avahi will conntect through",
796
{ .name = "keydir", .key = 'd',
798
.doc = "Directory where the openpgp keyring is",
800
{ .name = "seckey", .key = 's',
802
.doc = "Secret openpgp key for gnutls authentication",
804
{ .name = "pubkey", .key = 'p',
806
.doc = "Public openpgp key for gnutls authentication",
808
{ .name = "dh-bits", .key = 129,
810
.doc = "dh-bits to use in gnutls communication",
812
{ .name = "priority", .key = 130,
814
.doc = "GNUTLS priority", .group = 1 },
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
859
return ARGP_ERR_UNKNOWN;
864
struct argp argp = { .options = options, .parser = parse_opt,
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
1476
871
exitcode = EXIT_FAILURE;
1482
fprintf(stderr, "Could not find a network interface\n");
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
1483
879
exitcode = EXIT_FAILURE;
1488
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1489
from the signal handler */
1490
/* Initialize the pseudo-RNG for Avahi */
1491
srand((unsigned int) time(NULL));
1492
mc.simple_poll = avahi_simple_poll_new();
1493
if(mc.simple_poll == NULL){
1494
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1495
exitcode = EX_UNAVAILABLE;
1499
sigemptyset(&sigterm_action.sa_mask);
1500
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1502
perror_plus("sigaddset");
1503
exitcode = EX_OSERR;
1506
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1508
perror_plus("sigaddset");
1509
exitcode = EX_OSERR;
1512
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1514
perror_plus("sigaddset");
1515
exitcode = EX_OSERR;
1518
/* Need to check if the handler is SIG_IGN before handling:
1519
| [[info:libc:Initial Signal Actions]] |
1520
| [[info:libc:Basic Signal Handling]] |
1522
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1524
perror_plus("sigaction");
1527
if(old_sigterm_action.sa_handler != SIG_IGN){
1528
ret = sigaction(SIGINT, &sigterm_action, NULL);
1530
perror_plus("sigaction");
1531
exitcode = EX_OSERR;
1535
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1537
perror_plus("sigaction");
1540
if(old_sigterm_action.sa_handler != SIG_IGN){
1541
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1543
perror_plus("sigaction");
1544
exitcode = EX_OSERR;
1548
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1550
perror_plus("sigaction");
1553
if(old_sigterm_action.sa_handler != SIG_IGN){
1554
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1556
perror_plus("sigaction");
1557
exitcode = EX_OSERR;
1562
/* If the interface is down, bring it up */
1563
if(strcmp(interface, "none") != 0){
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
891
fprintf(stderr, "init_gnutls_global\n");
894
gnutls_initalized = true;
1564
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
1565
911
if(if_index == 0){
1566
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1567
exitcode = EX_UNAVAILABLE;
1575
/* Re-raise priviliges */
1579
perror_plus("seteuid");
1583
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1584
messages about the network interface to mess up the prompt */
1585
ret = klogctl(8, NULL, 5);
1586
bool restore_loglevel = true;
1588
restore_loglevel = false;
1589
perror_plus("klogctl");
1591
#endif /* __linux__ */
1593
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
perror_plus("socket");
1596
exitcode = EX_OSERR;
1598
if(restore_loglevel){
1599
ret = klogctl(7, NULL, 0);
1601
perror_plus("klogctl");
1604
#endif /* __linux__ */
1605
/* Lower privileges */
1609
perror_plus("seteuid");
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1616
perror_plus("ioctl SIOCGIFFLAGS");
1618
if(restore_loglevel){
1619
ret = klogctl(7, NULL, 0);
1621
perror_plus("klogctl");
1624
#endif /* __linux__ */
1625
exitcode = EX_OSERR;
1626
/* Lower privileges */
1630
perror_plus("seteuid");
1634
if((network.ifr_flags & IFF_UP) == 0){
1635
network.ifr_flags |= IFF_UP;
1636
take_down_interface = true;
1637
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1639
take_down_interface = false;
1640
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1641
exitcode = EX_OSERR;
1643
if(restore_loglevel){
1644
ret = klogctl(7, NULL, 0);
1646
perror_plus("klogctl");
1649
#endif /* __linux__ */
1650
/* Lower privileges */
1654
perror_plus("seteuid");
1659
/* Sleep checking until interface is running.
1660
Check every 0.25s, up to total time of delay */
1661
for(int i=0; i < delay * 4; i++){
916
if(connect_to != NULL){
917
/* Connect directly, do not use Zeroconf */
918
/* (Mainly meant for debugging) */
919
char *address = strrchr(connect_to, ':');
921
fprintf(stderr, "No colon in address\n");
922
exitcode = EXIT_FAILURE;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
928
perror("Bad port number");
929
exitcode = EXIT_FAILURE;
933
address = connect_to;
934
ret = start_mandos_communication(address, port, if_index, &mc);
936
exitcode = EXIT_FAILURE;
938
exitcode = EXIT_SUCCESS;
943
/* If the interface is down, bring it up */
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
948
exitcode = EXIT_FAILURE;
951
strcpy(network.ifr_name, interface); /* Spurious warning */
1662
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1664
perror_plus("ioctl SIOCGIFFLAGS");
1665
} else if(network.ifr_flags & IFF_RUNNING){
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1674
if(not take_down_interface){
1675
/* We won't need the socket anymore */
1676
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1678
perror_plus("close");
1682
if(restore_loglevel){
1683
/* Restores kernel loglevel to default */
1684
ret = klogctl(7, NULL, 0);
1686
perror_plus("klogctl");
1689
#endif /* __linux__ */
1690
/* Lower privileges */
1692
if(take_down_interface){
1693
/* Lower privileges */
1696
perror_plus("seteuid");
1699
/* Lower privileges permanently */
1702
perror_plus("setuid");
1711
ret = init_gnutls_global(pubkey, seckey);
1713
fprintf(stderr, "init_gnutls_global failed\n");
1714
exitcode = EX_UNAVAILABLE;
1717
gnutls_initialized = true;
1724
if(mkdtemp(tempdir) == NULL){
1725
perror_plus("mkdtemp");
1728
tempdir_created = true;
1734
if(not init_gpgme(pubkey, seckey, tempdir)){
1735
fprintf(stderr, "init_gpgme failed\n");
1736
exitcode = EX_UNAVAILABLE;
1739
gpgme_initialized = true;
1746
if(connect_to != NULL){
1747
/* Connect directly, do not use Zeroconf */
1748
/* (Mainly meant for debugging) */
1749
char *address = strrchr(connect_to, ':');
1750
if(address == NULL){
1751
fprintf(stderr, "No colon in address\n");
1752
exitcode = EX_USAGE;
1762
tmpmax = strtoimax(address+1, &tmp, 10);
1763
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1764
or tmpmax != (uint16_t)tmpmax){
1765
fprintf(stderr, "Bad port number\n");
1766
exitcode = EX_USAGE;
1774
port = (uint16_t)tmpmax;
1776
address = connect_to;
1777
/* Colon in address indicates IPv6 */
1779
if(strchr(address, ':') != NULL){
1789
while(not quit_now){
1790
ret = start_mandos_communication(address, port, if_index, af);
1791
if(quit_now or ret == 0){
1794
sleep((int)retry_interval or 1);
1798
exitcode = EXIT_SUCCESS;
1809
AvahiServerConfig config;
1810
/* Do not publish any local Zeroconf records */
1811
avahi_server_config_init(&config);
1812
config.publish_hinfo = 0;
1813
config.publish_addresses = 0;
1814
config.publish_workstation = 0;
1815
config.publish_domain = 0;
1817
/* Allocate a new server */
1818
mc.server = avahi_server_new(avahi_simple_poll_get
1819
(mc.simple_poll), &config, NULL,
1822
/* Free the Avahi configuration data */
1823
avahi_server_config_free(&config);
1826
/* Check if creating the Avahi server object succeeded */
1827
if(mc.server == NULL){
1828
fprintf(stderr, "Failed to create Avahi server: %s\n",
1829
avahi_strerror(error));
1830
exitcode = EX_UNAVAILABLE;
1838
/* Create the Avahi service browser */
1839
sb = avahi_s_service_browser_new(mc.server, if_index,
1840
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1841
NULL, 0, browse_callback, NULL);
1843
fprintf(stderr, "Failed to create service browser: %s\n",
1844
avahi_strerror(avahi_server_errno(mc.server)));
1845
exitcode = EX_UNAVAILABLE;
1853
/* Run the main loop */
1856
fprintf(stderr, "Starting Avahi loop search\n");
1859
ret = avahi_loop_with_timeout(mc.simple_poll,
1860
(int)(retry_interval * 1000));
1862
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1863
(ret == 0) ? "successfully" : "with error");
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
971
avahi_set_log_function(empty_log);
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
982
exitcode = EXIT_FAILURE;
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1024
/* Run the main loop */
1027
fprintf(stderr, "Starting Avahi loop search\n");
1030
avahi_simple_poll_loop(mc.simple_poll);
1869
fprintf(stderr, "%s exiting\n", argv[0]);
1872
/* Cleanup things */
1874
avahi_s_service_browser_free(sb);
1876
if(mc.server != NULL)
1877
avahi_server_free(mc.server);
1879
if(mc.simple_poll != NULL)
1880
avahi_simple_poll_free(mc.simple_poll);
1882
if(gnutls_initialized){
1883
gnutls_certificate_free_credentials(mc.cred);
1884
gnutls_global_deinit();
1885
gnutls_dh_params_deinit(mc.dh_params);
1888
if(gpgme_initialized){
1889
gpgme_release(mc.ctx);
1892
/* Cleans up the circular linked list of Mandos servers the client
1894
if(mc.current_server != NULL){
1895
mc.current_server->prev->next = NULL;
1896
while(mc.current_server != NULL){
1897
server *next = mc.current_server->next;
1898
free(mc.current_server);
1899
mc.current_server = next;
1903
/* Take down the network interface */
1904
if(take_down_interface){
1905
/* Re-raise priviliges */
1909
perror_plus("seteuid");
1912
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1914
perror_plus("ioctl SIOCGIFFLAGS");
1915
} else if(network.ifr_flags & IFF_UP) {
1916
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1917
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1919
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1922
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1924
perror_plus("close");
1926
/* Lower privileges permanently */
1930
perror_plus("setuid");
1935
/* Removes the GPGME temp directory and all files inside */
1936
if(tempdir_created){
1937
struct dirent **direntries = NULL;
1938
struct dirent *direntry = NULL;
1939
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1941
for(int i = 0; i < ret; i++){
1942
direntry = direntries[i];
1943
char *fullname = NULL;
1944
ret = asprintf(&fullname, "%s/%s", tempdir,
1947
perror_plus("asprintf");
1950
ret = remove(fullname);
1952
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1959
/* need to be cleaned even if ret == 0 because man page doesn't
1963
perror_plus("scandir");
1965
ret = rmdir(tempdir);
1966
if(ret == -1 and errno != ENOENT){
1967
perror_plus("rmdir");
1972
sigemptyset(&old_sigterm_action.sa_mask);
1973
old_sigterm_action.sa_handler = SIG_DFL;
1974
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1975
&old_sigterm_action,
1978
perror_plus("sigaction");
1981
ret = raise(signal_received);
1982
} while(ret != 0 and errno == EINTR);
1984
perror_plus("raise");
1987
TEMP_FAILURE_RETRY(pause());
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1038
/* Cleanup things */
1040
avahi_s_service_browser_free(sb);
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();