251
166
* Helper function to insert pub and seckey to the engine keyring.
253
168
bool import_key(const char *filename){
256
170
gpgme_data_t pgp_data;
258
172
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
178
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
179
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
180
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
271
185
rc = gpgme_op_import(mc.ctx, pgp_data);
272
186
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
278
192
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
perror_plus("close");
282
196
gpgme_data_release(pgp_data);
287
fprintf_plus(stderr, "Initializing GPGME\n");
201
fprintf(stderr, "Initializing GPGME\n");
291
205
gpgme_check_version(NULL);
292
206
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
207
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
208
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
209
gpgme_strsource(rc), gpgme_strerror(rc));
299
/* Set GPGME home directory for the OpenPGP engine only */
213
/* Set GPGME home directory for the OpenPGP engine only */
300
214
rc = gpgme_get_engine_info(&engine_info);
301
215
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
216
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
217
gpgme_strsource(rc), gpgme_strerror(rc));
306
220
while(engine_info != NULL){
374
285
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
286
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
378
289
plaintext_length = -1;
380
291
gpgme_decrypt_result_t result;
381
292
result = gpgme_op_decrypt_result(mc.ctx);
382
293
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
296
fprintf(stderr, "Unsupported algorithm: %s\n",
297
result->unsupported_algorithm);
298
fprintf(stderr, "Wrong key usage: %u\n",
299
result->wrong_key_usage);
389
300
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
301
fprintf(stderr, "File name: %s\n", result->file_name);
392
303
gpgme_recipient_t recipient;
393
304
recipient = result->recipients;
394
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
402
recipient = recipient->next;
306
while(recipient != NULL){
307
fprintf(stderr, "Public key algorithm: %s\n",
308
gpgme_pubkey_algo_name(recipient->pubkey_algo));
309
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
310
fprintf(stderr, "Secret key available: %s\n",
311
recipient->status == GPG_ERR_NO_SECKEY
313
recipient = recipient->next;
501
413
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
414
gnutls_certificate_allocate_credentials(&mc.cred);
503
415
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
416
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
safer_gnutls_strerror(ret));
506
421
gnutls_global_deinit();
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
426
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
427
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
517
431
ret = gnutls_certificate_set_openpgp_key_file
518
432
(mc.cred, pubkeyfilename, seckeyfilename,
519
433
GNUTLS_OPENPGP_FMT_BASE64);
520
434
if(ret != GNUTLS_E_SUCCESS){
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
436
"Error[%d] while reading the OpenPGP key pair ('%s',"
437
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
438
fprintf(stderr, "The GnuTLS error is: %s\n",
439
safer_gnutls_strerror(ret));
529
443
/* GnuTLS server initialization */
530
444
ret = gnutls_dh_params_init(&mc.dh_params);
531
445
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
537
450
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
451
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
556
469
static int init_gnutls_session(gnutls_session_t *session){
558
471
/* GnuTLS session creation */
560
ret = gnutls_init(session, GNUTLS_SERVER);
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
472
ret = gnutls_init(session, GNUTLS_SERVER);
565
473
if(ret != GNUTLS_E_SUCCESS){
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
475
safer_gnutls_strerror(ret));
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
576
gnutls_deinit(*session);
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
481
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
482
fprintf(stderr, "Syntax error at: %s\n", err);
483
fprintf(stderr, "GnuTLS error: %s\n",
484
safer_gnutls_strerror(ret));
584
485
gnutls_deinit(*session);
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
593
gnutls_deinit(*session);
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
597
492
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
494
safer_gnutls_strerror(ret));
600
495
gnutls_deinit(*session);
604
499
/* ignore client certificate if any. */
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
500
gnutls_certificate_server_set_request(*session,
607
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
1086
865
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
866
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1089
fprintf_plus(stderr, "No Mandos server found, still"
868
fprintf(stderr, "No Mandos server found, still searching...\n");
1096
/* Signal handler that stops main loop after SIGTERM */
1097
static void handle_sigterm(int sig){
1102
signal_received = sig;
874
static void handle_sigterm(__attribute__((unused)) int sig){
1103
875
int old_errno = errno;
1104
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
876
avahi_simple_poll_quit(mc.simple_poll);
1108
877
errno = old_errno;
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1116
perror_plus("socket");
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1123
perror_plus("ioctl SIOCGIFFLAGS");
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1165
/* Accept this device */
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1183
if(not get_flags(if_entry->d_name, &ifr)){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1191
if(not good_flags(if_entry->d_name, &ifr)){
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1208
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1234
if(not good_flags(if_entry->d_name, &ifr)){
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1257
if((direntry->d_name)[0] == '\0'){
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1278
perror_plus("asprintf");
1282
ret = stat(fullname, &st);
1285
perror_plus("Could not stat hook");
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1319
if(mc.current_server == NULL){
1321
fprintf_plus(stderr, "Wait until first server is found."
1324
ret = avahi_simple_poll_iterate(s, -1);
1327
fprintf_plus(stderr, "Check current_server if we should run"
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1333
perror_plus("clock_gettime");
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1360
avahi_simple_poll_quit(mc.simple_poll);
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1366
perror_plus("clock_gettime");
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1384
bool run_network_hooks(const char *mode, const char *interface,
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1392
perror_plus("scandir");
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1400
perror_plus("asprintf");
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1407
pid_t hook_pid = fork();
1410
/* Raise privileges */
1414
perror_plus("seteuid");
1416
/* Raise privileges even more */
1420
perror_plus("setuid");
1426
perror_plus("setgid");
1428
/* Reset supplementary groups */
1430
ret = setgroups(0, NULL);
1432
perror_plus("setgroups");
1434
dup2(devnull, STDIN_FILENO);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1439
perror_plus("setenv");
1442
ret = setenv("DEVICE", interface, 1);
1444
perror_plus("setenv");
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1449
perror_plus("setenv");
1452
ret = setenv("MODE", mode, 1);
1454
perror_plus("setenv");
1458
ret = asprintf(&delaystring, "%f", delay);
1460
perror_plus("asprintf");
1463
ret = setenv("DELAY", delaystring, 1);
1466
perror_plus("setenv");
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1511
880
int main(int argc, char *argv[]){
1512
881
AvahiSServiceBrowser *sb = NULL;
1515
884
intmax_t tmpmax;
1517
886
int exitcode = EXIT_SUCCESS;
1518
const char *interface = "";
887
const char *interface = "eth0";
1519
888
struct ifreq network;
1521
bool take_down_interface = false;
892
char *connect_to = NULL;
1524
893
char tempdir[] = "/tmp/mandosXXXXXX";
1525
894
bool tempdir_created = false;
1526
895
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1527
896
const char *seckey = PATHDIR "/" SECKEY;
1528
897
const char *pubkey = PATHDIR "/" PUBKEY;
899
/* Initialize Mandos context */
900
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
901
.dh_bits = 1024, .priority = "SECURE256"
902
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1530
903
bool gnutls_initialized = false;
1531
904
bool gpgme_initialized = false;
1533
double retry_interval = 10; /* 10s between trying a server and
1534
retrying the same server again */
1536
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
907
struct sigaction old_sigterm_action;
1537
908
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1542
/* Lower any group privileges we might have, just to be safe */
1546
perror_plus("setgid");
1549
/* Lower user privileges (temporarily) */
1553
perror_plus("seteuid");
1561
911
struct argp_option options[] = {
1562
912
{ .name = "debug", .key = 128,
1643
975
mc.priority = arg;
1645
977
case 131: /* --delay */
1647
delay = strtof(arg, &tmp);
1648
if(errno != 0 or tmp == arg or *tmp != '\0'){
1649
argp_error(state, "Bad delay");
1651
case 132: /* --retry */
1653
retry_interval = strtod(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'
1655
or (retry_interval * 1000) > INT_MAX
1656
or retry_interval < 0){
1657
argp_error(state, "Bad retry interval");
1660
case 133: /* --network-hook-dir */
1664
* These reproduce what we would get without ARGP_NO_HELP
1666
case '?': /* --help */
1667
argp_state_help(state, state->out_stream,
1668
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1669
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1670
case -3: /* --usage */
1671
argp_state_help(state, state->out_stream,
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1677
exit(argp_err_exit_status);
978
ret = sscanf(arg, "%lf%n", &delay, &numchars);
979
if(ret < 1 or arg[numchars] != '\0'){
980
fprintf(stderr, "Bad delay\n");
1680
989
return ARGP_ERR_UNKNOWN;
1685
994
struct argp argp = { .options = options, .parser = parse_opt,
1687
996
.doc = "Mandos client -- Get and decrypt"
1688
997
" passwords from a Mandos server" };
1689
ret = argp_parse(&argp, argc, argv,
1690
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1697
perror_plus("argp_parse");
1698
exitcode = EX_OSERR;
1701
exitcode = EX_USAGE;
1707
/* Work around Debian bug #633582:
1708
<http://bugs.debian.org/633582> */
1710
/* Re-raise priviliges */
1714
perror_plus("seteuid");
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1725
perror_plus("fstat");
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1731
perror_plus("fchown");
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
perror_plus("fstat");
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1752
perror_plus("fchown");
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1760
/* Lower privileges */
1764
perror_plus("seteuid");
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1775
avahi_set_log_function(empty_log);
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1784
/* No up interfaces, look for any good interfaces */
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1795
if(interface == NULL){
1796
perror_plus("malloc");
1798
exitcode = EXIT_FAILURE;
1804
fprintf_plus(stderr, "Could not find a network interface\n");
998
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
999
if(ret == ARGP_ERR_UNKNOWN){
1000
fprintf(stderr, "Unknown error while parsing arguments\n");
1805
1001
exitcode = EXIT_FAILURE;
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1811
from the signal handler */
1812
/* Initialize the pseudo-RNG for Avahi */
1813
srand((unsigned int) time(NULL));
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1818
exitcode = EX_UNAVAILABLE;
1822
sigemptyset(&sigterm_action.sa_mask);
1823
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1825
perror_plus("sigaddset");
1826
exitcode = EX_OSERR;
1829
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1835
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1837
perror_plus("sigaddset");
1838
exitcode = EX_OSERR;
1841
/* Need to check if the handler is SIG_IGN before handling:
1842
| [[info:libc:Initial Signal Actions]] |
1843
| [[info:libc:Basic Signal Handling]] |
1845
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1847
perror_plus("sigaction");
1850
if(old_sigterm_action.sa_handler != SIG_IGN){
1851
ret = sigaction(SIGINT, &sigterm_action, NULL);
1853
perror_plus("sigaction");
1854
exitcode = EX_OSERR;
1858
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1860
perror_plus("sigaction");
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1871
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1873
perror_plus("sigaction");
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1885
1006
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1898
/* Re-raise priviliges */
1902
perror_plus("seteuid");
1007
if(interface[0] != '\0'){
1905
1008
#ifdef __linux__
1906
1009
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1010
messages to mess up the prompt */
1908
1011
ret = klogctl(8, NULL, 5);
1909
1012
bool restore_loglevel = true;
1911
1014
restore_loglevel = false;
1912
perror_plus("klogctl");
1914
#endif /* __linux__ */
1916
1019
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1022
exitcode = EXIT_FAILURE;
1920
1023
#ifdef __linux__
1921
1024
if(restore_loglevel){
1922
1025
ret = klogctl(7, NULL, 0);
1924
perror_plus("klogctl");
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1932
perror_plus("seteuid");
1936
1033
strcpy(network.ifr_name, interface);
1937
1034
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
perror_plus("ioctl SIOCGIFFLAGS");
1036
perror("ioctl SIOCGIFFLAGS");
1940
1037
#ifdef __linux__
1941
1038
if(restore_loglevel){
1942
1039
ret = klogctl(7, NULL, 0);
1944
perror_plus("klogctl");
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1953
perror_plus("seteuid");
1045
exitcode = EXIT_FAILURE;
1957
1048
if((network.ifr_flags & IFF_UP) == 0){
1958
1049
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
1050
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1052
perror("ioctl SIOCSIFFLAGS");
1053
exitcode = EXIT_FAILURE;
1965
1054
#ifdef __linux__
1966
1055
if(restore_loglevel){
1967
1056
ret = klogctl(7, NULL, 0);
1969
perror_plus("klogctl");
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1977
perror_plus("seteuid");
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1065
/* sleep checking until interface is running */
1984
1066
for(int i=0; i < delay * 4; i++){
1985
1067
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
perror_plus("ioctl SIOCGIFFLAGS");
1069
perror("ioctl SIOCGIFFLAGS");
1988
1070
} else if(network.ifr_flags & IFF_RUNNING){
1991
1073
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
1074
ret = nanosleep(&sleeptime, NULL);
1993
1075
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1076
perror("nanosleep");
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
perror_plus("close");
1079
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
1083
#ifdef __linux__
2005
1084
if(restore_loglevel){
2006
1085
/* Restores kernel loglevel to default */
2007
1086
ret = klogctl(7, NULL, 0);
2009
perror_plus("klogctl");
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2015
/* Lower privileges */
2018
perror_plus("seteuid");
2026
1108
ret = init_gnutls_global(pubkey, seckey);
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2029
exitcode = EX_UNAVAILABLE;
1110
fprintf(stderr, "init_gnutls_global failed\n");
1111
exitcode = EXIT_FAILURE;
2032
1114
gnutls_initialized = true;
2039
1117
if(mkdtemp(tempdir) == NULL){
2040
perror_plus("mkdtemp");
2043
1121
tempdir_created = true;
2049
1123
if(not init_gpgme(pubkey, seckey, tempdir)){
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
1124
fprintf(stderr, "init_gpgme failed\n");
1125
exitcode = EXIT_FAILURE;
2054
1128
gpgme_initialized = true;
1131
if(interface[0] != '\0'){
1132
if_index = (AvahiIfIndex) if_nametoindex(interface);
1134
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1135
exitcode = EXIT_FAILURE;
2061
1140
if(connect_to != NULL){
2214
1273
gpgme_release(mc.ctx);
2217
/* Cleans up the circular linked list of Mandos servers the client
2219
if(mc.current_server != NULL){
2220
mc.current_server->prev->next = NULL;
2221
while(mc.current_server != NULL){
2222
server *next = mc.current_server->next;
2223
free(mc.current_server);
2224
mc.current_server = next;
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2231
/* Re-raise priviliges */
2236
perror_plus("seteuid");
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
perror_plus("close");
2257
/* Lower privileges permanently */
2261
perror_plus("setuid");
2264
/* Removes the GPGME temp directory and all files inside */
1276
/* Removes the temp directory used by GPGME */
2265
1277
if(tempdir_created){
2266
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
1279
struct dirent *direntry;
1280
d = opendir(tempdir);
1282
if(errno != ENOENT){
1287
direntry = readdir(d);
1288
if(direntry == NULL){
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
2273
1298
char *fullname = NULL;
2274
1299
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
1300
direntry->d_name);
2277
perror_plus("asprintf");
2280
1305
ret = remove(fullname);
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2285
1310
free(fullname);
2289
/* need to clean even if 0 because man page doesn't specify */
2291
if (numentries == -1){
2292
perror_plus("scandir");
2294
1314
ret = rmdir(tempdir);
2295
1315
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
2301
sigemptyset(&old_sigterm_action.sa_mask);
2302
old_sigterm_action.sa_handler = SIG_DFL;
2303
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2304
&old_sigterm_action,
2307
perror_plus("sigaction");
2310
ret = raise(signal_received);
2311
} while(ret != 0 and errno == EINTR);
2313
perror_plus("raise");
2316
TEMP_FAILURE_RETRY(pause());
2319
1320
return exitcode;