207
159
return buffer_capacity;
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
214
server *new_server = malloc(sizeof(server));
215
if(new_server == NULL){
216
perror_plus("malloc");
219
*new_server = (server){ .ip = strdup(ip),
221
.if_index = if_index,
223
if(new_server->ip == NULL){
224
perror_plus("strdup");
227
/* Special case of first server */
228
if(*current_server == NULL){
229
new_server->next = new_server;
230
new_server->prev = new_server;
231
*current_server = new_server;
232
/* Place the new server last in the list */
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
236
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
241
perror_plus("clock_gettime");
248
163
* Initialize GPGME.
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
252
168
gpgme_error_t rc;
253
169
gpgme_engine_info_t engine_info;
256
173
* Helper function to insert pub and seckey to the engine keyring.
258
175
bool import_key(const char *filename){
261
177
gpgme_data_t pgp_data;
263
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
269
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
186
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
276
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
277
193
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
283
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
285
perror_plus("close");
287
203
gpgme_data_release(pgp_data);
292
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
296
212
gpgme_check_version(NULL);
297
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
214
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
304
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
305
221
rc = gpgme_get_engine_info(&engine_info);
306
222
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
311
227
while(engine_info != NULL){
353
266
ssize_t plaintext_length = 0;
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
359
272
/* Create new GPGME data buffer from memory cryptotext */
360
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
362
275
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
368
281
/* Create new empty GPGME data buffer for the plaintext */
369
282
rc = gpgme_data_new(&dh_plain);
370
283
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
374
286
gpgme_data_release(dh_crypto);
378
290
/* Decrypt data from the cryptotext data buffer to the plaintext
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
293
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
384
296
plaintext_length = -1;
386
298
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
388
300
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
395
307
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
398
310
gpgme_recipient_t recipient;
399
311
recipient = result->recipients;
400
312
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
408
319
recipient = recipient->next;
507
418
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
509
420
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
safer_gnutls_strerror(ret));
512
426
gnutls_global_deinit();
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
523
436
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
525
438
GNUTLS_OPENPGP_FMT_BASE64);
526
439
if(ret != GNUTLS_E_SUCCESS){
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
535
448
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
537
450
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
456
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
556
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
557
469
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
562
static int init_gnutls_session(gnutls_session_t *session,
474
static int init_gnutls_session(gnutls_session_t *session){
565
476
/* GnuTLS session creation */
567
ret = gnutls_init(session, GNUTLS_SERVER);
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
572
478
if(ret != GNUTLS_E_SUCCESS){
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
583
gnutls_deinit(*session);
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
587
486
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
591
490
gnutls_deinit(*session);
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
600
gnutls_deinit(*session);
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
604
497
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
607
500
gnutls_deinit(*session);
611
504
/* ignore client certificate if any. */
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
1159
891
signal_received = sig;
1160
892
int old_errno = errno;
1161
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1175
perror_plus("socket");
1179
strcpy(ifr->ifr_name, ifname);
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
perror_plus("ioctl SIOCGIFFLAGS");
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1194
/* Reject the loopback device */
1195
if(ifr->ifr_flags & IFF_LOOPBACK){
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1202
/* Accept point-to-point devices only if connect_to is specified */
1203
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1210
/* Otherwise, reject non-broadcast-capable devices */
1211
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1218
/* Reject non-ARP interfaces (including dummy interfaces) */
1219
if(ifr->ifr_flags & IFF_NOARP){
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1227
/* Accept this device */
1229
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1235
* This function determines if a directory entry in /sys/class/net
1236
* corresponds to an acceptable network device.
1237
* (This function is passed to scandir(3) as a filter function.)
1239
int good_interface(const struct dirent *if_entry){
1240
if(if_entry->d_name[0] == '.'){
1245
if(not get_flags(if_entry->d_name, &ifr)){
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1253
if(not good_flags(if_entry->d_name, &ifr)){
1260
* This function determines if a network interface is up.
1262
bool interface_is_up(const char *interface){
1264
if(not get_flags(interface, &ifr)){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1276
* This function determines if a network interface is running
1278
bool interface_is_running(const char *interface){
1280
if(not get_flags(interface, &ifr)){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1291
int notdotentries(const struct dirent *direntry){
1292
/* Skip "." and ".." */
1293
if(direntry->d_name[0] == '.'
1294
and (direntry->d_name[1] == '\0'
1295
or (direntry->d_name[1] == '.'
1296
and direntry->d_name[2] == '\0'))){
1302
/* Is this directory entry a runnable program? */
1303
int runnable_hook(const struct dirent *direntry){
1308
if((direntry->d_name)[0] == '\0'){
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
"abcdefghijklmnopqrstuvwxyz"
1317
if((direntry->d_name)[sret] != '\0'){
1318
/* Contains non-allowed characters */
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1329
perror_plus("asprintf");
1333
ret = stat(fullname, &st);
1336
perror_plus("Could not stat hook");
1340
if(not (S_ISREG(st.st_mode))){
1341
/* Not a regular file */
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1348
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1349
/* Not executable */
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1366
struct timespec now;
1367
struct timespec waited_time;
1368
intmax_t block_time;
1371
if(mc->current_server == NULL){
1373
fprintf_plus(stderr, "Wait until first server is found."
1376
ret = avahi_simple_poll_iterate(s, -1);
1379
fprintf_plus(stderr, "Check current_server if we should run"
1382
/* the current time */
1383
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1385
perror_plus("clock_gettime");
1388
/* Calculating in ms how long time between now and server
1389
who we visted longest time ago. Now - last seen. */
1390
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1392
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1394
/* total time is 10s/10,000ms.
1395
Converting to s from ms by dividing by 1,000,
1396
and ns to ms by dividing by 1,000,000. */
1397
block_time = ((retry_interval
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1406
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1412
avahi_simple_poll_quit(s);
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1418
perror_plus("clock_gettime");
1421
mc->current_server = mc->current_server->next;
1422
block_time = 0; /* Call avahi to find new Mandos
1423
servers, but don't block */
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1429
if (ret > 0 or errno != EINTR){
1430
return (ret != 1) ? ret : 0;
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1442
perror_plus("seteuid");
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1456
if(setuid(0) == -1){
1458
perror_plus("seteuid");
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1470
perror_plus("seteuid");
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1482
perror_plus("setuid");
1488
bool run_network_hooks(const char *mode, const char *interface,
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1496
if(errno == ENOENT){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1502
perror_plus("scandir");
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1511
perror_plus("asprintf");
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1518
pid_t hook_pid = fork();
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1527
perror_plus("setgid");
1529
/* Reset supplementary groups */
1531
ret = setgroups(0, NULL);
1533
perror_plus("setgroups");
1535
dup2(devnull, STDIN_FILENO);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1540
perror_plus("setenv");
1543
ret = setenv("DEVICE", interface, 1);
1545
perror_plus("setenv");
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1550
perror_plus("setenv");
1553
ret = setenv("MODE", mode, 1);
1555
perror_plus("setenv");
1559
ret = asprintf(&delaystring, "%f", delay);
1561
perror_plus("asprintf");
1564
ret = setenv("DELAY", delaystring, 1);
1567
perror_plus("setenv");
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1574
perror_plus("setenv");
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1621
error_t bring_up_interface(const char *const interface,
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1647
network.ifr_flags |= IFF_UP;
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1652
perror_plus("socket");
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
/* Raise priviliges */
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1690
#endif /* __linux__ */
1692
/* Lower privileges */
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1698
perror_plus("close");
1701
if(ret_setflags == -1){
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1729
error_t take_down_interface(const char *const interface){
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1753
perror_plus("socket");
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1763
/* Raise priviliges */
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1769
/* Lower privileges */
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
perror_plus("close");
1778
if(ret_setflags == -1){
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
893
if(mc.simple_poll != NULL){
894
avahi_simple_poll_quit(mc.simple_poll);
1793
899
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1798
900
AvahiSServiceBrowser *sb = NULL;
1801
903
intmax_t tmpmax;
1803
905
int exitcode = EXIT_SUCCESS;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
906
const char *interface = "eth0";
907
struct ifreq network;
909
bool take_down_interface = false;
912
char *connect_to = NULL;
1806
913
char tempdir[] = "/tmp/mandosXXXXXX";
1807
914
bool tempdir_created = false;
1808
915
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
916
const char *seckey = PATHDIR "/" SECKEY;
1810
917
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1814
919
bool gnutls_initialized = false;
1815
920
bool gpgme_initialized = false;
1816
921
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1820
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
923
struct sigaction old_sigterm_action;
1821
924
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1826
/* Lower any group privileges we might have, just to be safe */
1830
perror_plus("setgid");
1833
/* Lower user privileges (temporarily) */
1837
perror_plus("seteuid");
1845
927
struct argp_option options[] = {
1846
928
{ .name = "debug", .key = 128,
1935
996
delay = strtof(arg, &tmp);
1936
997
if(errno != 0 or tmp == arg or *tmp != '\0'){
1937
argp_error(state, "Bad delay");
1939
case 132: /* --retry */
1941
retry_interval = strtod(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'
1943
or (retry_interval * 1000) > INT_MAX
1944
or retry_interval < 0){
1945
argp_error(state, "Bad retry interval");
1948
case 133: /* --network-hook-dir */
1952
* These reproduce what we would get without ARGP_NO_HELP
1954
case '?': /* --help */
1955
argp_state_help(state, state->out_stream,
1956
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1957
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1958
case -3: /* --usage */
1959
argp_state_help(state, state->out_stream,
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
exit(argp_err_exit_status);
998
fprintf(stderr, "Bad delay\n");
1966
1007
return ARGP_ERR_UNKNOWN;
1971
1012
struct argp argp = { .options = options, .parser = parse_opt,
1972
1013
.args_doc = "",
1973
1014
.doc = "Mandos client -- Get and decrypt"
1974
1015
" passwords from a Mandos server" };
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1983
perror_plus("argp_parse");
1984
exitcode = EX_OSERR;
1987
exitcode = EX_USAGE;
1993
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2007
perror_plus("fstat");
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2013
perror_plus("fchown");
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2028
perror_plus("fstat");
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2034
perror_plus("fchown");
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2042
/* Lower privileges */
2047
/* Remove invalid interface names (except "none") */
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2064
/* Run network hooks */
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
1016
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1017
if(ret == ARGP_ERR_UNKNOWN){
1018
fprintf(stderr, "Unknown error while parsing arguments\n");
1019
exitcode = EXIT_FAILURE;
2122
1062
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2124
perror_plus("sigaction");
1064
perror("sigaction");
1065
return EXIT_FAILURE;
2127
1067
if(old_sigterm_action.sa_handler != SIG_IGN){
2128
1068
ret = sigaction(SIGINT, &sigterm_action, NULL);
2130
perror_plus("sigaction");
2131
exitcode = EX_OSERR;
1070
perror("sigaction");
1071
exitcode = EXIT_FAILURE;
2135
1075
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2137
perror_plus("sigaction");
1077
perror("sigaction");
1078
return EXIT_FAILURE;
2140
1080
if(old_sigterm_action.sa_handler != SIG_IGN){
2141
1081
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2143
perror_plus("sigaction");
2144
exitcode = EX_OSERR;
1083
perror("sigaction");
1084
exitcode = EXIT_FAILURE;
2148
1088
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2150
perror_plus("sigaction");
1090
perror("sigaction");
1091
return EXIT_FAILURE;
2153
1093
if(old_sigterm_action.sa_handler != SIG_IGN){
2154
1094
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2156
perror_plus("sigaction");
2157
exitcode = EX_OSERR;
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2174
perror_plus("argz_add");
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2191
/* Bring up interfaces which are down, and remove any "none"s */
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
1096
perror("sigaction");
1097
exitcode = EXIT_FAILURE;
1102
/* If the interface is down, bring it up */
1103
if(interface[0] != '\0'){
1104
if_index = (AvahiIfIndex) if_nametoindex(interface);
1106
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1107
exitcode = EXIT_FAILURE;
1116
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1117
messages to mess up the prompt */
1118
ret = klogctl(8, NULL, 5);
1119
bool restore_loglevel = true;
1121
restore_loglevel = false;
1124
#endif /* __linux__ */
1126
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1129
exitcode = EXIT_FAILURE;
1131
if(restore_loglevel){
1132
ret = klogctl(7, NULL, 0);
1137
#endif /* __linux__ */
1140
strcpy(network.ifr_name, interface);
1141
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1143
perror("ioctl SIOCGIFFLAGS");
1145
if(restore_loglevel){
1146
ret = klogctl(7, NULL, 0);
1151
#endif /* __linux__ */
1152
exitcode = EXIT_FAILURE;
1155
if((network.ifr_flags & IFF_UP) == 0){
1156
network.ifr_flags |= IFF_UP;
1157
take_down_interface = true;
1158
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1160
take_down_interface = false;
1161
perror("ioctl SIOCSIFFLAGS");
1162
exitcode = EXIT_FAILURE;
1164
if(restore_loglevel){
1165
ret = klogctl(7, NULL, 0);
1170
#endif /* __linux__ */
1174
/* sleep checking until interface is running */
1175
for(int i=0; i < delay * 4; i++){
1176
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1178
perror("ioctl SIOCGIFFLAGS");
1179
} else if(network.ifr_flags & IFF_RUNNING){
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2217
perror_plus("Failed to bring up interface");
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
2246
exitcode = EX_UNAVAILABLE;
1182
struct timespec sleeptime = { .tv_nsec = 250000000 };
1183
ret = nanosleep(&sleeptime, NULL);
1184
if(ret == -1 and errno != EINTR){
1185
perror("nanosleep");
1188
if(not take_down_interface){
1189
/* We won't need the socket anymore */
1190
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1196
if(restore_loglevel){
1197
/* Restores kernel loglevel to default */
1198
ret = klogctl(7, NULL, 0);
1203
#endif /* __linux__ */
1228
ret = init_gnutls_global(pubkey, seckey);
1230
fprintf(stderr, "init_gnutls_global failed\n");
1231
exitcode = EXIT_FAILURE;
2249
1234
gnutls_initialized = true;
2435
1396
gpgme_release(mc.ctx);
2438
/* Cleans up the circular linked list of Mandos servers the client
2440
if(mc.current_server != NULL){
2441
mc.current_server->prev->next = NULL;
2442
while(mc.current_server != NULL){
2443
server *next = mc.current_server->next;
2444
free(mc.current_server);
2445
mc.current_server = next;
2449
/* Re-raise priviliges */
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2457
/* Take down the network interfaces which were brought up */
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2463
ret_errno = take_down_interface(interface);
2466
perror_plus("Failed to take down interface");
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2475
lower_privileges_permanently();
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2481
/* Removes the GPGME temp directory and all files inside */
1399
/* Take down the network interface */
1400
if(take_down_interface){
1401
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1403
perror("ioctl SIOCGIFFLAGS");
1404
} else if(network.ifr_flags & IFF_UP) {
1405
network.ifr_flags &= ~IFF_UP; /* clear flag */
1406
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1408
perror("ioctl SIOCSIFFLAGS");
1411
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1417
/* Removes the temp directory used by GPGME */
2482
1418
if(tempdir_created){
2483
struct dirent **direntries = NULL;
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
2489
direntry = direntries[i];
1420
struct dirent *direntry;
1421
d = opendir(tempdir);
1423
if(errno != ENOENT){
1428
direntry = readdir(d);
1429
if(direntry == NULL){
1432
/* Skip "." and ".." */
1433
if(direntry->d_name[0] == '.'
1434
and (direntry->d_name[1] == '\0'
1435
or (direntry->d_name[1] == '.'
1436
and direntry->d_name[2] == '\0'))){
2490
1439
char *fullname = NULL;
2491
1440
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
1441
direntry->d_name);
2494
perror_plus("asprintf");
2497
1446
ret = remove(fullname);
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1448
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2502
1451
free(fullname);
2506
/* need to clean even if 0 because man page doesn't specify */
2508
if (numentries == -1){
2509
perror_plus("scandir");
2511
1455
ret = rmdir(tempdir);
2512
1456
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
2518
1462
sigemptyset(&old_sigterm_action.sa_mask);
2519
1463
old_sigterm_action.sa_handler = SIG_DFL;
2520
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2521
&old_sigterm_action,
1464
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2524
perror_plus("sigaction");
2527
ret = raise(signal_received);
2528
} while(ret != 0 and errno == EINTR);
2530
perror_plus("raise");
2533
TEMP_FAILURE_RETRY(pause());
1466
perror("sigaction");
1468
raise(signal_received);
2536
1471
return exitcode;