273
351
ssize_t plaintext_length = 0;
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
279
357
/* Create new GPGME data buffer from memory cryptotext */
280
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
282
360
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
288
366
/* Create new empty GPGME data buffer for the plaintext */
289
367
rc = gpgme_data_new(&dh_plain);
290
368
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
369
fprintf_plus(stderr, "Mandos plugin mandos-client: "
370
"bad gpgme_data_new: %s: %s\n",
371
gpgme_strsource(rc), gpgme_strerror(rc));
293
372
gpgme_data_release(dh_crypto);
297
376
/* Decrypt data from the cryptotext data buffer to the plaintext
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
379
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
380
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
303
382
plaintext_length = -1;
305
384
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
385
result = gpgme_op_decrypt_result(mc->ctx);
307
386
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
389
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
390
result->unsupported_algorithm);
391
fprintf_plus(stderr, "Wrong key usage: %u\n",
392
result->wrong_key_usage);
314
393
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
394
fprintf_plus(stderr, "File name: %s\n", result->file_name);
317
396
gpgme_recipient_t recipient;
318
397
recipient = result->recipients;
319
398
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
399
fprintf_plus(stderr, "Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name
401
(recipient->pubkey_algo));
402
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
403
fprintf_plus(stderr, "Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
326
406
recipient = recipient->next;
425
505
/* OpenPGP credentials */
426
ret = gnutls_certificate_allocate_credentials(&mc.cred);
506
ret = gnutls_certificate_allocate_credentials(&mc->cred);
427
507
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n",
429
safer_gnutls_strerror(ret));
508
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
safer_gnutls_strerror(ret));
430
510
gnutls_global_deinit();
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
515
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
516
" secret key %s as GnuTLS credentials\n",
440
521
ret = gnutls_certificate_set_openpgp_key_file
441
(mc.cred, pubkeyfilename, seckeyfilename,
522
(mc->cred, pubkeyfilename, seckeyfilename,
442
523
GNUTLS_OPENPGP_FMT_BASE64);
443
524
if(ret != GNUTLS_E_SUCCESS){
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
526
"Error[%d] while reading the OpenPGP key pair ('%s',"
527
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
528
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
529
safer_gnutls_strerror(ret));
452
533
/* GnuTLS server initialization */
453
ret = gnutls_dh_params_init(&mc.dh_params);
534
ret = gnutls_dh_params_init(&mc->dh_params);
454
535
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
536
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
537
" initialization: %s\n",
538
safer_gnutls_strerror(ret));
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
460
542
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
472
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_certificate_free_credentials(mc->cred);
473
555
gnutls_global_deinit();
474
gnutls_dh_params_deinit(mc.dh_params);
556
gnutls_dh_params_deinit(mc->dh_params);
478
static int init_gnutls_session(gnutls_session_t *session){
560
static int init_gnutls_session(gnutls_session_t *session,
480
563
/* GnuTLS session creation */
1016
1121
signal_received = sig;
1017
1122
int old_errno = errno;
1018
if(mc.simple_poll != NULL){
1019
avahi_simple_poll_quit(mc.simple_poll);
1123
/* set main loop to exit */
1124
if(simple_poll != NULL){
1125
avahi_simple_poll_quit(simple_poll);
1021
1127
errno = old_errno;
1130
bool get_flags(const char *ifname, struct ifreq *ifr){
1134
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1137
perror_plus("socket");
1141
strcpy(ifr->ifr_name, ifname);
1142
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1146
perror_plus("ioctl SIOCGIFFLAGS");
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
fprintf_plus(stderr, "Accepting point-to-point interface"
1168
" \"%s\"\n", ifname);
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1176
" \"%s\"\n", ifname);
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1183
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1189
/* Accept this device */
1191
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1025
1197
* This function determines if a directory entry in /sys/class/net
1026
1198
* corresponds to an acceptable network device.
1027
1199
* (This function is passed to scandir(3) as a filter function.)
1029
1201
int good_interface(const struct dirent *if_entry){
1031
char *flagname = NULL;
1032
1202
if(if_entry->d_name[0] == '.'){
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1207
if(not get_flags(if_entry->d_name, &ifr)){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1215
if(not good_flags(if_entry->d_name, &ifr)){
1222
* This function determines if a network interface is up.
1224
bool interface_is_up(const char *interface){
1226
if(not get_flags(interface, &ifr)){
1228
fprintf_plus(stderr, "Failed to get flags for interface "
1229
"\"%s\"\n", interface);
1234
return (bool)(ifr.ifr_flags & IFF_UP);
1238
* This function determines if a network interface is running
1240
bool interface_is_running(const char *interface){
1242
if(not get_flags(interface, &ifr)){
1244
fprintf_plus(stderr, "Failed to get flags for interface "
1245
"\"%s\"\n", interface);
1250
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1253
int notdotentries(const struct dirent *direntry){
1254
/* Skip "." and ".." */
1255
if(direntry->d_name[0] == '.'
1256
and (direntry->d_name[1] == '\0'
1257
or (direntry->d_name[1] == '.'
1258
and direntry->d_name[2] == '\0'))){
1264
/* Is this directory entry a runnable program? */
1265
int runnable_hook(const struct dirent *direntry){
1270
if((direntry->d_name)[0] == '\0'){
1275
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
"abcdefghijklmnopqrstuvwxyz"
1279
if((direntry->d_name)[sret] != '\0'){
1280
/* Contains non-allowed characters */
1282
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1041
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1048
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1049
/* read line from flags_fd */
1050
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1052
flagstring[(size_t)to_read] = '\0';
1053
if(flagstring == NULL){
1059
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1291
perror_plus("asprintf");
1295
ret = stat(fullname, &st);
1298
perror_plus("Could not stat hook");
1302
if(not (S_ISREG(st.st_mode))){
1303
/* Not a regular file */
1305
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1310
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1311
/* Not executable */
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1319
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
mandos_context *mc){
1328
struct timespec now;
1329
struct timespec waited_time;
1330
intmax_t block_time;
1333
if(mc->current_server == NULL){
1335
fprintf_plus(stderr, "Wait until first server is found."
1338
ret = avahi_simple_poll_iterate(s, -1);
1341
fprintf_plus(stderr, "Check current_server if we should run"
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1347
perror_plus("clock_gettime");
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc->current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc->current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1364
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc->current_server->ip,
1370
mc->current_server->port,
1371
mc->current_server->if_index,
1372
mc->current_server->af, mc);
1374
avahi_simple_poll_quit(s);
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc->current_server->last_seen);
1380
perror_plus("clock_gettime");
1383
mc->current_server = mc->current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1404
perror_plus("seteuid");
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1418
if(setuid(0) == -1){
1420
perror_plus("seteuid");
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1432
perror_plus("seteuid");
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1444
perror_plus("setuid");
1450
bool run_network_hooks(const char *mode, const char *interface,
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1458
if(errno == ENOENT){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1464
perror_plus("scandir");
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1473
perror_plus("asprintf");
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1480
pid_t hook_pid = fork();
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1489
perror_plus("setgid");
1491
/* Reset supplementary groups */
1493
ret = setgroups(0, NULL);
1495
perror_plus("setgroups");
1497
dup2(devnull, STDIN_FILENO);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1502
perror_plus("setenv");
1505
ret = setenv("DEVICE", interface, 1);
1507
perror_plus("setenv");
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1512
perror_plus("setenv");
1515
ret = setenv("MODE", mode, 1);
1517
perror_plus("setenv");
1521
ret = asprintf(&delaystring, "%f", delay);
1523
perror_plus("asprintf");
1526
ret = setenv("DELAY", delaystring, 1);
1529
perror_plus("setenv");
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1536
perror_plus("setenv");
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1583
error_t bring_up_interface(const char *const interface,
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1589
struct ifreq network;
1590
unsigned int if_index = if_nametoindex(interface);
1592
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1602
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
1605
fprintf_plus(stderr, "Failed to get flags for interface "
1606
"\"%s\"\n", interface);
1609
network.ifr_flags |= IFF_UP;
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1614
perror_plus("socket");
1626
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1630
/* Raise priviliges */
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
1642
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1646
if(restore_loglevel){
1647
ret_linux = klogctl(7, NULL, 0);
1648
if(ret_linux == -1){
1649
perror_plus("klogctl");
1652
#endif /* __linux__ */
1654
/* Lower privileges */
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1660
perror_plus("close");
1663
if(ret_setflags == -1){
1665
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1670
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1674
/* Sleep checking until interface is running.
1675
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
1677
if(interface_is_running(interface)){
1076
tmpmax = strtoimax(flagstring, &tmp, 0);
1077
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1078
and not (isspace(*tmp)))
1079
or tmpmax != (ifreq_flags)tmpmax){
1081
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1082
flagstring, if_entry->d_name);
1088
ifreq_flags flags = (ifreq_flags)tmpmax;
1089
/* Reject the loopback device */
1090
if(flags & IFF_LOOPBACK){
1092
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1097
/* Accept point-to-point devices only if connect_to is specified */
1098
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1105
/* Otherwise, reject non-broadcast-capable devices */
1106
if(not (flags & IFF_BROADCAST)){
1108
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1113
/* Reject non-ARP interfaces (including dummy interfaces) */
1114
if(flags & IFF_NOARP){
1116
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1121
/* Accept this device */
1123
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1680
struct timespec sleeptime = { .tv_nsec = 250000000 };
1681
ret = nanosleep(&sleeptime, NULL);
1682
if(ret == -1 and errno != EINTR){
1683
perror_plus("nanosleep");
1691
error_t take_down_interface(const char *const interface){
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
1696
struct ifreq network;
1697
unsigned int if_index = if_nametoindex(interface);
1699
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1703
if(interface_is_up(interface)){
1704
if(not get_flags(interface, &network) and debug){
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", interface);
1710
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1715
perror_plus("socket");
1721
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1725
/* Raise priviliges */
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1731
/* Lower privileges */
1734
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1737
perror_plus("close");
1740
if(ret_setflags == -1){
1742
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1747
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1129
1755
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1130
1759
AvahiSServiceBrowser *sb = NULL;
1133
1762
intmax_t tmpmax;
1135
1764
int exitcode = EXIT_SUCCESS;
1136
const char *interface = "";
1137
struct ifreq network;
1139
bool take_down_interface = false;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
char *interfaces_to_take_down = NULL;
1768
size_t interfaces_to_take_down_size = 0;
1142
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1143
1770
bool tempdir_created = false;
1144
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1145
1772
const char *seckey = PATHDIR "/" SECKEY;
1146
1773
const char *pubkey = PATHDIR "/" PUBKEY;
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1148
1777
bool gnutls_initialized = false;
1149
1778
bool gpgme_initialized = false;
1150
1779
float delay = 2.5f;
1780
double retry_interval = 10; /* 10s between trying a server and
1781
retrying the same server again */
1152
1783
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1153
1784
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1956
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
1963
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1964
int seckey_fd = open(seckey, O_RDONLY);
1965
if(seckey_fd == -1){
1966
perror_plus("open");
1968
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1970
perror_plus("fstat");
1972
if(S_ISREG(st.st_mode)
1973
and st.st_uid == 0 and st.st_gid == 0){
1974
ret = fchown(seckey_fd, uid, gid);
1976
perror_plus("fchown");
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
1984
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
int pubkey_fd = open(pubkey, O_RDONLY);
1986
if(pubkey_fd == -1){
1987
perror_plus("open");
1989
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1991
perror_plus("fstat");
1993
if(S_ISREG(st.st_mode)
1994
and st.st_uid == 0 and st.st_gid == 0){
1995
ret = fchown(pubkey_fd, uid, gid);
1997
perror_plus("fchown");
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2005
/* Lower privileges */
2009
perror_plus("seteuid");
2014
/* Remove empty interface names */
2016
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2021
fprintf_plus(stderr, "Not using nonexisting interface"
2022
" \"%s\"\n", interface);
2024
argz_delete(&interfaces, &interfaces_size, interface);
2030
/* Run network hooks */
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2035
if(interfaces_hooks == NULL){
2036
perror_plus("malloc");
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
1302
2051
avahi_set_log_function(empty_log);
1305
if(interface[0] == '\0'){
1306
struct dirent **direntries;
1307
ret = scandir(sys_class_net, &direntries, good_interface,
1310
/* Pick the first good interface */
1311
interface = strdup(direntries[0]->d_name);
1313
fprintf(stderr, "Using interface \"%s\"\n", interface);
1315
if(interface == NULL){
1318
exitcode = EXIT_FAILURE;
1324
fprintf(stderr, "Could not find a network interface\n");
1325
exitcode = EXIT_FAILURE;
1330
2054
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1331
2055
from the signal handler */
1332
2056
/* Initialize the pseudo-RNG for Avahi */
1333
2057
srand((unsigned int) time(NULL));
1334
mc.simple_poll = avahi_simple_poll_new();
1335
if(mc.simple_poll == NULL){
1336
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2058
simple_poll = avahi_simple_poll_new();
2059
if(simple_poll == NULL){
2060
fprintf_plus(stderr,
2061
"Avahi: Failed to create simple poll object.\n");
1337
2062
exitcode = EX_UNAVAILABLE;
1364
2089
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1366
perror("sigaction");
2091
perror_plus("sigaction");
1367
2092
return EX_OSERR;
1369
2094
if(old_sigterm_action.sa_handler != SIG_IGN){
1370
2095
ret = sigaction(SIGINT, &sigterm_action, NULL);
1372
perror("sigaction");
2097
perror_plus("sigaction");
1373
2098
exitcode = EX_OSERR;
1377
2102
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1379
perror("sigaction");
2104
perror_plus("sigaction");
1380
2105
return EX_OSERR;
1382
2107
if(old_sigterm_action.sa_handler != SIG_IGN){
1383
2108
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1385
perror("sigaction");
2110
perror_plus("sigaction");
1386
2111
exitcode = EX_OSERR;
1390
2115
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1392
perror("sigaction");
2117
perror_plus("sigaction");
1393
2118
return EX_OSERR;
1395
2120
if(old_sigterm_action.sa_handler != SIG_IGN){
1396
2121
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1398
perror("sigaction");
2123
perror_plus("sigaction");
1399
2124
exitcode = EX_OSERR;
1404
/* If the interface is down, bring it up */
1405
if(strcmp(interface, "none") != 0){
1406
if_index = (AvahiIfIndex) if_nametoindex(interface);
1408
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1409
exitcode = EX_UNAVAILABLE;
1417
/* Re-raise priviliges */
1425
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1426
messages about the network interface to mess up the prompt */
1427
ret = klogctl(8, NULL, 5);
1428
bool restore_loglevel = true;
1430
restore_loglevel = false;
1433
#endif /* __linux__ */
1435
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1438
exitcode = EX_OSERR;
1440
if(restore_loglevel){
1441
ret = klogctl(7, NULL, 0);
1446
#endif /* __linux__ */
1447
/* Lower privileges */
1455
strcpy(network.ifr_name, interface);
1456
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1458
perror("ioctl SIOCGIFFLAGS");
1460
if(restore_loglevel){
1461
ret = klogctl(7, NULL, 0);
1466
#endif /* __linux__ */
1467
exitcode = EX_OSERR;
1468
/* Lower privileges */
1476
if((network.ifr_flags & IFF_UP) == 0){
1477
network.ifr_flags |= IFF_UP;
1478
take_down_interface = true;
1479
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
take_down_interface = false;
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1483
exitcode = EX_OSERR;
1485
if(restore_loglevel){
1486
ret = klogctl(7, NULL, 0);
1491
#endif /* __linux__ */
1492
/* Lower privileges */
1501
/* sleep checking until interface is running */
1502
for(int i=0; i < delay * 4; i++){
1503
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1505
perror("ioctl SIOCGIFFLAGS");
1506
} else if(network.ifr_flags & IFF_RUNNING){
1509
struct timespec sleeptime = { .tv_nsec = 250000000 };
1510
ret = nanosleep(&sleeptime, NULL);
1511
if(ret == -1 and errno != EINTR){
1512
perror("nanosleep");
1515
if(not take_down_interface){
1516
/* We won't need the socket anymore */
1517
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1523
if(restore_loglevel){
1524
/* Restores kernel loglevel to default */
1525
ret = klogctl(7, NULL, 0);
1530
#endif /* __linux__ */
1531
/* Lower privileges */
1533
if(take_down_interface){
1534
/* Lower privileges */
2129
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2132
/* Look for any good interfaces */
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2136
/* Add all found interfaces to interfaces list */
2137
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2139
direntries[i]->d_name);
2141
perror_plus("argz_add");
2145
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
direntries[i]->d_name);
1540
/* Lower privileges permanently */
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2153
exitcode = EXIT_FAILURE;
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2170
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2173
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2175
if(not interface_was_up){
2178
perror_plus("Failed to bring up interface");
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2188
interfaces_size = 0;
2189
if(debug and (interfaces_to_take_down == NULL)){
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
1552
ret = init_gnutls_global(pubkey, seckey);
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
1554
fprintf(stderr, "init_gnutls_global failed\n");
2200
fprintf_plus(stderr, "init_gnutls_global failed\n");
1555
2201
exitcode = EX_UNAVAILABLE;