166
254
* Helper function to insert pub and seckey to the engine keyring.
168
256
bool import_key(const char *filename){
170
259
gpgme_data_t pgp_data;
172
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
178
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
179
268
if(rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
185
274
rc = gpgme_op_import(mc.ctx, pgp_data);
186
275
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
192
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
283
perror_plus("close");
196
285
gpgme_data_release(pgp_data);
201
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
205
294
gpgme_check_version(NULL);
206
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
207
296
if(rc != GPG_ERR_NO_ERROR){
208
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
209
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
213
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
214
303
rc = gpgme_get_engine_info(&engine_info);
215
304
if(rc != GPG_ERR_NO_ERROR){
216
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
217
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
220
309
while(engine_info != NULL){
285
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
286
378
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
289
381
plaintext_length = -1;
291
383
gpgme_decrypt_result_t result;
292
384
result = gpgme_op_decrypt_result(mc.ctx);
293
385
if(result == NULL){
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
296
fprintf(stderr, "Unsupported algorithm: %s\n",
297
result->unsupported_algorithm);
298
fprintf(stderr, "Wrong key usage: %u\n",
299
result->wrong_key_usage);
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
300
392
if(result->file_name != NULL){
301
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
303
395
gpgme_recipient_t recipient;
304
396
recipient = result->recipients;
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;
397
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
405
recipient = recipient->next;
413
504
/* OpenPGP credentials */
414
gnutls_certificate_allocate_credentials(&mc.cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
415
506
if(ret != GNUTLS_E_SUCCESS){
416
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
421
509
gnutls_global_deinit();
426
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
427
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
431
520
ret = gnutls_certificate_set_openpgp_key_file
432
521
(mc.cred, pubkeyfilename, seckeyfilename,
433
522
GNUTLS_OPENPGP_FMT_BASE64);
434
523
if(ret != GNUTLS_E_SUCCESS){
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));
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
443
532
/* GnuTLS server initialization */
444
533
ret = gnutls_dh_params_init(&mc.dh_params);
445
534
if(ret != GNUTLS_E_SUCCESS){
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
450
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
451
541
if(ret != GNUTLS_E_SUCCESS){
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
469
559
static int init_gnutls_session(gnutls_session_t *session){
471
561
/* GnuTLS session creation */
472
ret = gnutls_init(session, GNUTLS_SERVER);
563
ret = gnutls_init(session, GNUTLS_SERVER);
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
473
568
if(ret != GNUTLS_E_SUCCESS){
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
475
safer_gnutls_strerror(ret));
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
579
gnutls_deinit(*session);
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
481
583
if(ret != GNUTLS_E_SUCCESS){
482
fprintf(stderr, "Syntax error at: %s\n", err);
483
fprintf(stderr, "GnuTLS error: %s\n",
484
safer_gnutls_strerror(ret));
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
485
587
gnutls_deinit(*session);
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
gnutls_deinit(*session);
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
492
600
if(ret != GNUTLS_E_SUCCESS){
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
494
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
495
603
gnutls_deinit(*session);
499
607
/* ignore client certificate if any. */
500
gnutls_certificate_server_set_request(*session,
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
865
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
866
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
868
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
fprintf_plus(stderr, "No Mandos server found, still"
874
static void handle_sigterm(__attribute__((unused)) int sig){
1102
/* Signal handler that stops main loop after SIGTERM */
1103
static void handle_sigterm(int sig){
1108
signal_received = sig;
875
1109
int old_errno = errno;
876
avahi_simple_poll_quit(mc.simple_poll);
1110
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
877
1114
errno = old_errno;
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1122
perror_plus("socket");
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1129
perror_plus("ioctl SIOCGIFFLAGS");
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1138
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1146
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1154
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
/* Accept this device */
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1189
if(not get_flags(if_entry->d_name, &ifr)){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1197
if(not good_flags(if_entry->d_name, &ifr)){
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1214
if(not get_flags(if_entry->d_name, &ifr)){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if(not good_flags(if_entry->d_name, &ifr)){
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1263
if((direntry->d_name)[0] == '\0'){
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1284
perror_plus("asprintf");
1288
ret = stat(fullname, &st);
1291
perror_plus("Could not stat hook");
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1325
if(mc.current_server == NULL){
1327
fprintf_plus(stderr, "Wait until first server is found."
1330
ret = avahi_simple_poll_iterate(s, -1);
1333
fprintf_plus(stderr, "Check current_server if we should run"
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1339
perror_plus("clock_gettime");
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1366
avahi_simple_poll_quit(mc.simple_poll);
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1372
perror_plus("clock_gettime");
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1390
bool run_network_hooks(const char *mode, const char *interface,
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1398
perror_plus("scandir");
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1406
perror_plus("asprintf");
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1413
pid_t hook_pid = fork();
1416
/* Raise privileges */
1420
perror_plus("seteuid");
1422
/* Raise privileges even more */
1426
perror_plus("setuid");
1432
perror_plus("setgid");
1434
/* Reset supplementary groups */
1436
ret = setgroups(0, NULL);
1438
perror_plus("setgroups");
1440
dup2(devnull, STDIN_FILENO);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1445
perror_plus("setenv");
1448
ret = setenv("DEVICE", interface, 1);
1450
perror_plus("setenv");
1453
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1455
perror_plus("setenv");
1458
ret = setenv("MODE", mode, 1);
1460
perror_plus("setenv");
1464
ret = asprintf(&delaystring, "%f", delay);
1466
perror_plus("asprintf");
1469
ret = setenv("DELAY", delaystring, 1);
1472
perror_plus("setenv");
1476
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1477
perror_plus("execl");
1478
_exit(EXIT_FAILURE);
1482
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1483
perror_plus("waitpid");
1487
if(WIFEXITED(status)){
1488
if(WEXITSTATUS(status) != 0){
1489
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1490
" with status %d\n", direntry->d_name,
1491
WEXITSTATUS(status));
1495
} else if(WIFSIGNALED(status)){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1497
" signal %d\n", direntry->d_name,
1502
fprintf_plus(stderr, "Warning: network hook \"%s\""
1503
" crashed\n", direntry->d_name);
1510
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
880
1519
int main(int argc, char *argv[]){
881
1520
AvahiSServiceBrowser *sb = NULL;
884
1523
intmax_t tmpmax;
886
1525
int exitcode = EXIT_SUCCESS;
887
const char *interface = "eth0";
1526
const char *interface = "";
888
1527
struct ifreq network;
1529
bool take_down_interface = false;
892
char *connect_to = NULL;
893
1532
char tempdir[] = "/tmp/mandosXXXXXX";
894
1533
bool tempdir_created = false;
895
1534
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
896
1535
const char *seckey = PATHDIR "/" SECKEY;
897
1536
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" };
903
1538
bool gnutls_initialized = false;
904
1539
bool gpgme_initialized = false;
907
struct sigaction old_sigterm_action;
1541
double retry_interval = 10; /* 10s between trying a server and
1542
retrying the same server again */
1544
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
908
1545
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1550
/* Lower any group privileges we might have, just to be safe */
1554
perror_plus("setgid");
1557
/* Lower user privileges (temporarily) */
1561
perror_plus("seteuid");
911
1569
struct argp_option options[] = {
912
1570
{ .name = "debug", .key = 128,
975
1651
mc.priority = arg;
977
1653
case 131: /* --delay */
978
ret = sscanf(arg, "%lf%n", &delay, &numchars);
979
if(ret < 1 or arg[numchars] != '\0'){
980
fprintf(stderr, "Bad delay\n");
1655
delay = strtof(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'){
1657
argp_error(state, "Bad delay");
1659
case 132: /* --retry */
1661
retry_interval = strtod(arg, &tmp);
1662
if(errno != 0 or tmp == arg or *tmp != '\0'
1663
or (retry_interval * 1000) > INT_MAX
1664
or retry_interval < 0){
1665
argp_error(state, "Bad retry interval");
1668
case 133: /* --network-hook-dir */
1672
* These reproduce what we would get without ARGP_NO_HELP
1674
case '?': /* --help */
1675
argp_state_help(state, state->out_stream,
1676
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1677
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1678
case -3: /* --usage */
1679
argp_state_help(state, state->out_stream,
1680
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1681
case 'V': /* --version */
1682
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1683
exit(argp_err_exit_status);
989
1686
return ARGP_ERR_UNKNOWN;
994
1691
struct argp argp = { .options = options, .parser = parse_opt,
996
1693
.doc = "Mandos client -- Get and decrypt"
997
1694
" passwords from a Mandos server" };
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");
1695
ret = argp_parse(&argp, argc, argv,
1696
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1703
perror_plus("argp_parse");
1704
exitcode = EX_OSERR;
1707
exitcode = EX_USAGE;
1713
/* Work around Debian bug #633582:
1714
<http://bugs.debian.org/633582> */
1716
/* Re-raise priviliges */
1720
perror_plus("seteuid");
1724
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1725
int seckey_fd = open(seckey, O_RDONLY);
1726
if(seckey_fd == -1){
1727
perror_plus("open");
1729
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1731
perror_plus("fstat");
1733
if(S_ISREG(st.st_mode)
1734
and st.st_uid == 0 and st.st_gid == 0){
1735
ret = fchown(seckey_fd, uid, gid);
1737
perror_plus("fchown");
1741
TEMP_FAILURE_RETRY(close(seckey_fd));
1745
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1746
int pubkey_fd = open(pubkey, O_RDONLY);
1747
if(pubkey_fd == -1){
1748
perror_plus("open");
1750
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1752
perror_plus("fstat");
1754
if(S_ISREG(st.st_mode)
1755
and st.st_uid == 0 and st.st_gid == 0){
1756
ret = fchown(pubkey_fd, uid, gid);
1758
perror_plus("fchown");
1762
TEMP_FAILURE_RETRY(close(pubkey_fd));
1766
/* Lower privileges */
1770
perror_plus("seteuid");
1775
/* Run network hooks */
1776
if(not run_network_hooks("start", interface, delay)){
1781
avahi_set_log_function(empty_log);
1784
if(interface[0] == '\0'){
1785
struct dirent **direntries;
1786
/* First look for interfaces that are up */
1787
ret = scandir(sys_class_net, &direntries, up_interface,
1790
/* No up interfaces, look for any good interfaces */
1792
ret = scandir(sys_class_net, &direntries, good_interface,
1796
/* Pick the first interface returned */
1797
interface = strdup(direntries[0]->d_name);
1799
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1801
if(interface == NULL){
1802
perror_plus("malloc");
1804
exitcode = EXIT_FAILURE;
1810
fprintf_plus(stderr, "Could not find a network interface\n");
1001
1811
exitcode = EXIT_FAILURE;
1816
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1817
from the signal handler */
1818
/* Initialize the pseudo-RNG for Avahi */
1819
srand((unsigned int) time(NULL));
1820
mc.simple_poll = avahi_simple_poll_new();
1821
if(mc.simple_poll == NULL){
1822
fprintf_plus(stderr,
1823
"Avahi: Failed to create simple poll object.\n");
1824
exitcode = EX_UNAVAILABLE;
1828
sigemptyset(&sigterm_action.sa_mask);
1829
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1835
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1837
perror_plus("sigaddset");
1838
exitcode = EX_OSERR;
1841
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1843
perror_plus("sigaddset");
1844
exitcode = EX_OSERR;
1847
/* Need to check if the handler is SIG_IGN before handling:
1848
| [[info:libc:Initial Signal Actions]] |
1849
| [[info:libc:Basic Signal Handling]] |
1851
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1853
perror_plus("sigaction");
1856
if(old_sigterm_action.sa_handler != SIG_IGN){
1857
ret = sigaction(SIGINT, &sigterm_action, NULL);
1859
perror_plus("sigaction");
1860
exitcode = EX_OSERR;
1864
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1866
perror_plus("sigaction");
1869
if(old_sigterm_action.sa_handler != SIG_IGN){
1870
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1872
perror_plus("sigaction");
1873
exitcode = EX_OSERR;
1877
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1879
perror_plus("sigaction");
1882
if(old_sigterm_action.sa_handler != SIG_IGN){
1883
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1885
perror_plus("sigaction");
1886
exitcode = EX_OSERR;
1006
1891
/* If the interface is down, bring it up */
1007
if(interface[0] != '\0'){
1892
if(strcmp(interface, "none") != 0){
1893
if_index = (AvahiIfIndex) if_nametoindex(interface);
1895
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1896
exitcode = EX_UNAVAILABLE;
1904
/* Re-raise priviliges */
1908
perror_plus("seteuid");
1008
1911
#ifdef __linux__
1009
1912
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1010
messages to mess up the prompt */
1913
messages about the network interface to mess up the prompt */
1011
1914
ret = klogctl(8, NULL, 5);
1012
1915
bool restore_loglevel = true;
1014
1917
restore_loglevel = false;
1918
perror_plus("klogctl");
1920
#endif /* __linux__ */
1019
1922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1022
exitcode = EXIT_FAILURE;
1924
perror_plus("socket");
1925
exitcode = EX_OSERR;
1023
1926
#ifdef __linux__
1024
1927
if(restore_loglevel){
1025
1928
ret = klogctl(7, NULL, 0);
1930
perror_plus("klogctl");
1933
#endif /* __linux__ */
1934
/* Lower privileges */
1938
perror_plus("seteuid");
1033
1942
strcpy(network.ifr_name, interface);
1034
1943
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1036
perror("ioctl SIOCGIFFLAGS");
1945
perror_plus("ioctl SIOCGIFFLAGS");
1037
1946
#ifdef __linux__
1038
1947
if(restore_loglevel){
1039
1948
ret = klogctl(7, NULL, 0);
1950
perror_plus("klogctl");
1045
exitcode = EXIT_FAILURE;
1953
#endif /* __linux__ */
1954
exitcode = EX_OSERR;
1955
/* Lower privileges */
1959
perror_plus("seteuid");
1048
1963
if((network.ifr_flags & IFF_UP) == 0){
1049
1964
network.ifr_flags |= IFF_UP;
1965
take_down_interface = true;
1050
1966
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1052
perror("ioctl SIOCSIFFLAGS");
1053
exitcode = EXIT_FAILURE;
1968
take_down_interface = false;
1969
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1970
exitcode = EX_OSERR;
1054
1971
#ifdef __linux__
1055
1972
if(restore_loglevel){
1056
1973
ret = klogctl(7, NULL, 0);
1975
perror_plus("klogctl");
1978
#endif /* __linux__ */
1979
/* Lower privileges */
1983
perror_plus("seteuid");
1065
/* sleep checking until interface is running */
1988
/* Sleep checking until interface is running.
1989
Check every 0.25s, up to total time of delay */
1066
1990
for(int i=0; i < delay * 4; i++){
1067
1991
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1069
perror("ioctl SIOCGIFFLAGS");
1993
perror_plus("ioctl SIOCGIFFLAGS");
1070
1994
} else if(network.ifr_flags & IFF_RUNNING){
1073
1997
struct timespec sleeptime = { .tv_nsec = 250000000 };
1074
1998
ret = nanosleep(&sleeptime, NULL);
1075
1999
if(ret == -1 and errno != EINTR){
1076
perror("nanosleep");
2000
perror_plus("nanosleep");
1079
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
if(not take_down_interface){
2004
/* We won't need the socket anymore */
2005
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2007
perror_plus("close");
1083
2010
#ifdef __linux__
1084
2011
if(restore_loglevel){
1085
2012
/* Restores kernel loglevel to default */
1086
2013
ret = klogctl(7, NULL, 0);
2015
perror_plus("klogctl");
2018
#endif /* __linux__ */
2019
/* Lower privileges */
2021
/* Lower privileges */
2024
perror_plus("seteuid");
1108
2032
ret = init_gnutls_global(pubkey, seckey);
1110
fprintf(stderr, "init_gnutls_global failed\n");
1111
exitcode = EXIT_FAILURE;
2034
fprintf_plus(stderr, "init_gnutls_global failed\n");
2035
exitcode = EX_UNAVAILABLE;
1114
2038
gnutls_initialized = true;
1117
2045
if(mkdtemp(tempdir) == NULL){
2046
perror_plus("mkdtemp");
1121
2049
tempdir_created = true;
1123
2055
if(not init_gpgme(pubkey, seckey, tempdir)){
1124
fprintf(stderr, "init_gpgme failed\n");
1125
exitcode = EXIT_FAILURE;
2056
fprintf_plus(stderr, "init_gpgme failed\n");
2057
exitcode = EX_UNAVAILABLE;
1128
2060
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;
1140
2067
if(connect_to != NULL){
1273
2220
gpgme_release(mc.ctx);
1276
/* Removes the temp directory used by GPGME */
2223
/* Cleans up the circular linked list of Mandos servers the client
2225
if(mc.current_server != NULL){
2226
mc.current_server->prev->next = NULL;
2227
while(mc.current_server != NULL){
2228
server *next = mc.current_server->next;
2229
free(mc.current_server);
2230
mc.current_server = next;
2234
/* Run network hooks */
2235
run_network_hooks("stop", interface, delay);
2237
/* Re-raise priviliges */
2242
perror_plus("seteuid");
2245
/* Take down the network interface */
2246
if(take_down_interface and geteuid() == 0){
2247
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2249
perror_plus("ioctl SIOCGIFFLAGS");
2250
} else if(network.ifr_flags & IFF_UP){
2251
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2252
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2254
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2257
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2259
perror_plus("close");
2263
/* Lower privileges permanently */
2267
perror_plus("setuid");
2270
/* Removes the GPGME temp directory and all files inside */
1277
2271
if(tempdir_created){
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'))){
2272
struct dirent **direntries = NULL;
2273
struct dirent *direntry = NULL;
2274
int numentries = scandir(tempdir, &direntries, notdotentries,
2276
if (numentries > 0){
2277
for(int i = 0; i < numentries; i++){
2278
direntry = direntries[i];
1298
2279
char *fullname = NULL;
1299
2280
ret = asprintf(&fullname, "%s/%s", tempdir,
1300
2281
direntry->d_name);
2283
perror_plus("asprintf");
1305
2286
ret = remove(fullname);
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2288
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1310
2291
free(fullname);
2295
/* need to clean even if 0 because man page doesn't specify */
2297
if (numentries == -1){
2298
perror_plus("scandir");
1314
2300
ret = rmdir(tempdir);
1315
2301
if(ret == -1 and errno != ENOENT){
2302
perror_plus("rmdir");
2307
sigemptyset(&old_sigterm_action.sa_mask);
2308
old_sigterm_action.sa_handler = SIG_DFL;
2309
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2310
&old_sigterm_action,
2313
perror_plus("sigaction");
2316
ret = raise(signal_received);
2317
} while(ret != 0 and errno == EINTR);
2319
perror_plus("raise");
2322
TEMP_FAILURE_RETRY(pause());
1320
2325
return exitcode;