152
207
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");
156
248
* Initialize GPGME.
158
static bool init_gpgme(const char *seckey,
159
const char *pubkey, const char *tempdir){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
161
252
gpgme_error_t rc;
162
253
gpgme_engine_info_t engine_info;
166
256
* Helper function to insert pub and seckey to the engine keyring.
168
258
bool import_key(const char *filename){
170
261
gpgme_data_t pgp_data;
172
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
178
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
179
270
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));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
185
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
186
277
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
192
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
285
perror_plus("close");
196
287
gpgme_data_release(pgp_data);
201
fprintf(stderr, "Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
205
296
gpgme_check_version(NULL);
206
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
207
298
if(rc != GPG_ERR_NO_ERROR){
208
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
209
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
213
/* Set GPGME home directory for the OpenPGP engine only */
304
/* Set GPGME home directory for the OpenPGP engine only */
214
305
rc = gpgme_get_engine_info(&engine_info);
215
306
if(rc != GPG_ERR_NO_ERROR){
216
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
217
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
220
311
while(engine_info != NULL){
259
353
ssize_t plaintext_length = 0;
262
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
265
359
/* Create new GPGME data buffer from memory cryptotext */
266
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
268
362
if(rc != GPG_ERR_NO_ERROR){
269
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
274
368
/* Create new empty GPGME data buffer for the plaintext */
275
369
rc = gpgme_data_new(&dh_plain);
276
370
if(rc != GPG_ERR_NO_ERROR){
277
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
278
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
279
374
gpgme_data_release(dh_crypto);
283
378
/* Decrypt data from the cryptotext data buffer to the plaintext
285
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
286
381
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
289
384
plaintext_length = -1;
291
386
gpgme_decrypt_result_t result;
292
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
293
388
if(result == NULL){
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
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);
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);
300
395
if(result->file_name != NULL){
301
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
303
398
gpgme_recipient_t recipient;
304
399
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;
400
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
408
recipient = recipient->next;
413
507
/* OpenPGP credentials */
414
gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
415
509
if(ret != GNUTLS_E_SUCCESS){
416
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
safer_gnutls_strerror(ret));
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
421
512
gnutls_global_deinit();
426
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
427
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
431
523
ret = gnutls_certificate_set_openpgp_key_file
432
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
433
525
GNUTLS_OPENPGP_FMT_BASE64);
434
526
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));
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));
443
535
/* GnuTLS server initialization */
444
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
445
537
if(ret != GNUTLS_E_SUCCESS){
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
450
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
451
544
if(ret != GNUTLS_E_SUCCESS){
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
457
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
464
557
gnutls_global_deinit();
465
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
469
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
471
565
/* GnuTLS session creation */
472
ret = gnutls_init(session, GNUTLS_SERVER);
567
ret = gnutls_init(session, GNUTLS_SERVER);
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
473
572
if(ret != GNUTLS_E_SUCCESS){
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
475
safer_gnutls_strerror(ret));
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
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);
481
587
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));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
485
591
gnutls_deinit(*session);
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
600
gnutls_deinit(*session);
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
492
604
if(ret != GNUTLS_E_SUCCESS){
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
494
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
495
607
gnutls_deinit(*session);
499
611
/* ignore client certificate if any. */
500
gnutls_certificate_server_set_request(*session,
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
865
1136
case AVAHI_BROWSER_ALL_FOR_NOW:
866
1137
case AVAHI_BROWSER_CACHE_EXHAUSTED:
868
fprintf(stderr, "No Mandos server found, still searching...\n");
1139
fprintf_plus(stderr, "No Mandos server found, still"
874
static void handle_sigterm(__attribute__((unused)) int sig){
1146
/* Signal handler that stops main loop after SIGTERM */
1147
static void handle_sigterm(int sig){
1152
signal_received = sig;
875
1153
int old_errno = errno;
876
avahi_simple_poll_quit(mc.simple_poll);
1154
/* set main loop to exit */
1155
if(simple_poll != NULL){
1156
avahi_simple_poll_quit(simple_poll);
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1168
perror_plus("socket");
1172
strcpy(ifr->ifr_name, ifname);
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
perror_plus("ioctl SIOCGIFFLAGS");
1185
bool good_flags(const char *ifname, const struct ifreq *ifr){
1187
/* Reject the loopback device */
1188
if(ifr->ifr_flags & IFF_LOOPBACK){
1190
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1195
/* Accept point-to-point devices only if connect_to is specified */
1196
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1198
fprintf_plus(stderr, "Accepting point-to-point interface"
1199
" \"%s\"\n", ifname);
1203
/* Otherwise, reject non-broadcast-capable devices */
1204
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1206
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1207
" \"%s\"\n", ifname);
1211
/* Reject non-ARP interfaces (including dummy interfaces) */
1212
if(ifr->ifr_flags & IFF_NOARP){
1214
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1220
/* Accept this device */
1222
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1228
* This function determines if a directory entry in /sys/class/net
1229
* corresponds to an acceptable network device.
1230
* (This function is passed to scandir(3) as a filter function.)
1232
int good_interface(const struct dirent *if_entry){
1233
if(if_entry->d_name[0] == '.'){
1238
if(not get_flags(if_entry->d_name, &ifr)){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", if_entry->d_name);
1246
if(not good_flags(if_entry->d_name, &ifr)){
1253
* This function determines if a network interface is up.
1255
bool interface_is_up(const char *interface){
1257
if(not get_flags(interface, &ifr)){
1259
fprintf_plus(stderr, "Failed to get flags for interface "
1260
"\"%s\"\n", interface);
1265
return (bool)(ifr.ifr_flags & IFF_UP);
1269
* This function determines if a network interface is running
1271
bool interface_is_running(const char *interface){
1273
if(not get_flags(interface, &ifr)){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1284
int notdotentries(const struct dirent *direntry){
1285
/* Skip "." and ".." */
1286
if(direntry->d_name[0] == '.'
1287
and (direntry->d_name[1] == '\0'
1288
or (direntry->d_name[1] == '.'
1289
and direntry->d_name[2] == '\0'))){
1295
/* Is this directory entry a runnable program? */
1296
int runnable_hook(const struct dirent *direntry){
1301
if((direntry->d_name)[0] == '\0'){
1306
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1307
"abcdefghijklmnopqrstuvwxyz"
1310
if((direntry->d_name)[sret] != '\0'){
1311
/* Contains non-allowed characters */
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1322
perror_plus("asprintf");
1326
ret = stat(fullname, &st);
1329
perror_plus("Could not stat hook");
1333
if(not (S_ISREG(st.st_mode))){
1334
/* Not a regular file */
1336
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1341
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1342
/* Not executable */
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1350
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1357
mandos_context *mc){
1359
struct timespec now;
1360
struct timespec waited_time;
1361
intmax_t block_time;
1364
if(mc->current_server == NULL){
1366
fprintf_plus(stderr, "Wait until first server is found."
1369
ret = avahi_simple_poll_iterate(s, -1);
1372
fprintf_plus(stderr, "Check current_server if we should run"
1375
/* the current time */
1376
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1378
perror_plus("clock_gettime");
1381
/* Calculating in ms how long time between now and server
1382
who we visted longest time ago. Now - last seen. */
1383
waited_time.tv_sec = (now.tv_sec
1384
- mc->current_server->last_seen.tv_sec);
1385
waited_time.tv_nsec = (now.tv_nsec
1386
- mc->current_server->last_seen.tv_nsec);
1387
/* total time is 10s/10,000ms.
1388
Converting to s from ms by dividing by 1,000,
1389
and ns to ms by dividing by 1,000,000. */
1390
block_time = ((retry_interval
1391
- ((intmax_t)waited_time.tv_sec * 1000))
1392
- ((intmax_t)waited_time.tv_nsec / 1000000));
1395
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
if(block_time <= 0){
1400
ret = start_mandos_communication(mc->current_server->ip,
1401
mc->current_server->port,
1402
mc->current_server->if_index,
1403
mc->current_server->af, mc);
1405
avahi_simple_poll_quit(s);
1408
ret = clock_gettime(CLOCK_MONOTONIC,
1409
&mc->current_server->last_seen);
1411
perror_plus("clock_gettime");
1414
mc->current_server = mc->current_server->next;
1415
block_time = 0; /* Call avahi to find new Mandos
1416
servers, but don't block */
1419
ret = avahi_simple_poll_iterate(s, (int)block_time);
1422
if (ret > 0 or errno != EINTR){
1423
return (ret != 1) ? ret : 0;
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1435
perror_plus("seteuid");
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1449
if(setuid(0) == -1){
1451
perror_plus("seteuid");
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1463
perror_plus("seteuid");
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1475
perror_plus("setuid");
1481
bool run_network_hooks(const char *mode, const char *interface,
1483
struct dirent **direntries;
1484
struct dirent *direntry;
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1489
if(errno == ENOENT){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1495
perror_plus("scandir");
1498
int devnull = open("/dev/null", O_RDONLY);
1499
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1501
char *fullname = NULL;
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1504
perror_plus("asprintf");
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1511
pid_t hook_pid = fork();
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1520
perror_plus("setgid");
1522
/* Reset supplementary groups */
1524
ret = setgroups(0, NULL);
1526
perror_plus("setgroups");
1528
dup2(devnull, STDIN_FILENO);
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1533
perror_plus("setenv");
1536
ret = setenv("DEVICE", interface, 1);
1538
perror_plus("setenv");
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1543
perror_plus("setenv");
1546
ret = setenv("MODE", mode, 1);
1548
perror_plus("setenv");
1552
ret = asprintf(&delaystring, "%f", delay);
1554
perror_plus("asprintf");
1557
ret = setenv("DELAY", delaystring, 1);
1560
perror_plus("setenv");
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1567
perror_plus("setenv");
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1578
perror_plus("waitpid");
1582
if(WIFEXITED(status)){
1583
if(WEXITSTATUS(status) != 0){
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1590
} else if(WIFSIGNALED(status)){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1614
error_t bring_up_interface(const char *const interface,
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
1620
struct ifreq network;
1621
unsigned int if_index = if_nametoindex(interface);
1623
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1633
if(not interface_is_up(interface)){
1634
if(not get_flags(interface, &network) and debug){
1636
fprintf_plus(stderr, "Failed to get flags for interface "
1637
"\"%s\"\n", interface);
1640
network.ifr_flags |= IFF_UP;
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1645
perror_plus("socket");
1657
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
/* Raise priviliges */
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
1673
#endif /* __linux__ */
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1677
if(restore_loglevel){
1678
ret_linux = klogctl(7, NULL, 0);
1679
if(ret_linux == -1){
1680
perror_plus("klogctl");
1683
#endif /* __linux__ */
1685
/* Lower privileges */
1688
/* Close the socket */
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1691
perror_plus("close");
1694
if(ret_setflags == -1){
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
/* Sleep checking until interface is running.
1706
Check every 0.25s, up to total time of delay */
1707
for(int i=0; i < delay * 4; i++){
1708
if(interface_is_running(interface)){
1711
struct timespec sleeptime = { .tv_nsec = 250000000 };
1712
ret = nanosleep(&sleeptime, NULL);
1713
if(ret == -1 and errno != EINTR){
1714
perror_plus("nanosleep");
1722
error_t take_down_interface(const char *const interface){
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
1727
struct ifreq network;
1728
unsigned int if_index = if_nametoindex(interface);
1730
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
if(interface_is_up(interface)){
1735
if(not get_flags(interface, &network) and debug){
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1746
perror_plus("socket");
1752
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
/* Raise priviliges */
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1762
/* Lower privileges */
1765
/* Close the socket */
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1768
perror_plus("close");
1771
if(ret_setflags == -1){
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
880
1786
int main(int argc, char *argv[]){
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
881
1791
AvahiSServiceBrowser *sb = NULL;
884
1794
intmax_t tmpmax;
886
1796
int exitcode = EXIT_SUCCESS;
887
const char *interface = "eth0";
888
struct ifreq network;
892
char *connect_to = NULL;
1797
char *interfaces_to_take_down = NULL;
1798
size_t interfaces_to_take_down_size = 0;
893
1799
char tempdir[] = "/tmp/mandosXXXXXX";
894
1800
bool tempdir_created = false;
895
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
896
1802
const char *seckey = PATHDIR "/" SECKEY;
897
1803
const char *pubkey = PATHDIR "/" PUBKEY;
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
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
1807
bool gnutls_initialized = false;
904
1808
bool gpgme_initialized = false;
907
struct sigaction old_sigterm_action;
1810
double retry_interval = 10; /* 10s between trying a server and
1811
retrying the same server again */
1813
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
908
1814
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1819
/* Lower any group privileges we might have, just to be safe */
1823
perror_plus("setgid");
1826
/* Lower user privileges (temporarily) */
1830
perror_plus("seteuid");
911
1838
struct argp_option options[] = {
912
1839
{ .name = "debug", .key = 128,
975
1924
mc.priority = arg;
977
1926
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");
1928
delay = strtof(arg, &tmp);
1929
if(errno != 0 or tmp == arg or *tmp != '\0'){
1930
argp_error(state, "Bad delay");
1932
case 132: /* --retry */
1934
retry_interval = strtod(arg, &tmp);
1935
if(errno != 0 or tmp == arg or *tmp != '\0'
1936
or (retry_interval * 1000) > INT_MAX
1937
or retry_interval < 0){
1938
argp_error(state, "Bad retry interval");
1941
case 133: /* --network-hook-dir */
1945
* These reproduce what we would get without ARGP_NO_HELP
1947
case '?': /* --help */
1948
argp_state_help(state, state->out_stream,
1949
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1950
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1951
case -3: /* --usage */
1952
argp_state_help(state, state->out_stream,
1953
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1954
case 'V': /* --version */
1955
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1956
exit(argp_err_exit_status);
989
1959
return ARGP_ERR_UNKNOWN;
994
1964
struct argp argp = { .options = options, .parser = parse_opt,
996
1966
.doc = "Mandos client -- Get and decrypt"
997
1967
" 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");
1001
exitcode = EXIT_FAILURE;
1006
/* If the interface is down, bring it up */
1007
if(interface[0] != '\0'){
1009
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1010
messages to mess up the prompt */
1011
ret = klogctl(8, NULL, 5);
1012
bool restore_loglevel = true;
1014
restore_loglevel = false;
1019
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1022
exitcode = EXIT_FAILURE;
1024
if(restore_loglevel){
1025
ret = klogctl(7, NULL, 0);
1033
strcpy(network.ifr_name, interface);
1034
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1036
perror("ioctl SIOCGIFFLAGS");
1038
if(restore_loglevel){
1039
ret = klogctl(7, NULL, 0);
1045
exitcode = EXIT_FAILURE;
1048
if((network.ifr_flags & IFF_UP) == 0){
1049
network.ifr_flags |= IFF_UP;
1050
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1052
perror("ioctl SIOCSIFFLAGS");
1053
exitcode = EXIT_FAILURE;
1055
if(restore_loglevel){
1056
ret = klogctl(7, NULL, 0);
1968
ret = argp_parse(&argp, argc, argv,
1969
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1976
perror_plus("argp_parse");
1977
exitcode = EX_OSERR;
1980
exitcode = EX_USAGE;
1986
/* Work around Debian bug #633582:
1987
<http://bugs.debian.org/633582> */
1989
/* Re-raise priviliges */
1990
if(raise_privileges() == 0){
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1994
int seckey_fd = open(seckey, O_RDONLY);
1995
if(seckey_fd == -1){
1996
perror_plus("open");
1998
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2000
perror_plus("fstat");
2002
if(S_ISREG(st.st_mode)
2003
and st.st_uid == 0 and st.st_gid == 0){
2004
ret = fchown(seckey_fd, uid, gid);
2006
perror_plus("fchown");
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2016
if(pubkey_fd == -1){
2017
perror_plus("open");
2019
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2021
perror_plus("fstat");
2023
if(S_ISREG(st.st_mode)
2024
and st.st_uid == 0 and st.st_gid == 0){
2025
ret = fchown(pubkey_fd, uid, gid);
2027
perror_plus("fchown");
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
/* Lower privileges */
2040
/* Remove invalid interface names (except "none") */
2042
char *interface = NULL;
2043
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2045
if(strcmp(interface, "none") != 0
2046
and if_nametoindex(interface) == 0){
2047
if(interface[0] != '\0'){
2048
fprintf_plus(stderr, "Not using nonexisting interface"
2049
" \"%s\"\n", interface);
2051
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2057
/* Run network hooks */
2059
if(mc.interfaces != NULL){
2060
interfaces_hooks = malloc(mc.interfaces_size);
2061
if(interfaces_hooks == NULL){
2062
perror_plus("malloc");
1065
/* sleep checking until interface is running */
1066
for(int i=0; i < delay * 4; i++){
1067
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1069
perror("ioctl SIOCGIFFLAGS");
1070
} else if(network.ifr_flags & IFF_RUNNING){
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2077
avahi_set_log_function(empty_log);
2080
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2081
from the signal handler */
2082
/* Initialize the pseudo-RNG for Avahi */
2083
srand((unsigned int) time(NULL));
2084
simple_poll = avahi_simple_poll_new();
2085
if(simple_poll == NULL){
2086
fprintf_plus(stderr,
2087
"Avahi: Failed to create simple poll object.\n");
2088
exitcode = EX_UNAVAILABLE;
2092
sigemptyset(&sigterm_action.sa_mask);
2093
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2095
perror_plus("sigaddset");
2096
exitcode = EX_OSERR;
2099
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2101
perror_plus("sigaddset");
2102
exitcode = EX_OSERR;
2105
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2107
perror_plus("sigaddset");
2108
exitcode = EX_OSERR;
2111
/* Need to check if the handler is SIG_IGN before handling:
2112
| [[info:libc:Initial Signal Actions]] |
2113
| [[info:libc:Basic Signal Handling]] |
2115
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2117
perror_plus("sigaction");
2120
if(old_sigterm_action.sa_handler != SIG_IGN){
2121
ret = sigaction(SIGINT, &sigterm_action, NULL);
2123
perror_plus("sigaction");
2124
exitcode = EX_OSERR;
2128
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2130
perror_plus("sigaction");
2133
if(old_sigterm_action.sa_handler != SIG_IGN){
2134
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2136
perror_plus("sigaction");
2137
exitcode = EX_OSERR;
2141
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2143
perror_plus("sigaction");
2146
if(old_sigterm_action.sa_handler != SIG_IGN){
2147
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2149
perror_plus("sigaction");
2150
exitcode = EX_OSERR;
2155
/* If no interfaces were specified, make a list */
2156
if(mc.interfaces == NULL){
2157
struct dirent **direntries;
2158
/* Look for any good interfaces */
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2162
/* Add all found interfaces to interfaces list */
2163
for(int i = 0; i < ret; ++i){
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2165
direntries[i]->d_name);
2167
perror_plus("argz_add");
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2172
direntries[i]->d_name);
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2179
exitcode = EXIT_FAILURE;
2184
/* Bring up interfaces which are down */
2186
char *interface = NULL;
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2189
/* If interface name is "none", stop bringing up interfaces.
2190
Also remove all instances of "none" from the list */
2191
if(strcmp(interface, "none") == 0){
2192
argz_delete(&mc.interfaces, &mc.interfaces_size,
2195
while((interface = argz_next(mc.interfaces,
2196
mc.interfaces_size, interface))){
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
1073
struct timespec sleeptime = { .tv_nsec = 250000000 };
1074
ret = nanosleep(&sleeptime, NULL);
1075
if(ret == -1 and errno != EINTR){
1076
perror("nanosleep");
1079
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1084
if(restore_loglevel){
1085
/* Restores kernel loglevel to default */
1086
ret = klogctl(7, NULL, 0);
1108
ret = init_gnutls_global(pubkey, seckey);
1110
fprintf(stderr, "init_gnutls_global failed\n");
1111
exitcode = EXIT_FAILURE;
2205
bool interface_was_up = interface_is_up(interface);
2206
ret = bring_up_interface(interface, delay);
2207
if(not interface_was_up){
2210
perror_plus("Failed to bring up interface");
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2218
if(debug and (interfaces_to_take_down == NULL)){
2219
fprintf_plus(stderr, "No interfaces were brought up\n");
2223
/* If we only got one interface, explicitly use only that one */
2224
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2226
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2229
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
2239
exitcode = EX_UNAVAILABLE;
1114
2242
gnutls_initialized = true;
1117
2249
if(mkdtemp(tempdir) == NULL){
2250
perror_plus("mkdtemp");
1121
2253
tempdir_created = true;
1123
if(not init_gpgme(pubkey, seckey, tempdir)){
1124
fprintf(stderr, "init_gpgme failed\n");
1125
exitcode = EXIT_FAILURE;
2259
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2260
fprintf_plus(stderr, "init_gpgme failed\n");
2261
exitcode = EX_UNAVAILABLE;
1128
2264
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
2271
if(connect_to != NULL){
1141
2272
/* Connect directly, do not use Zeroconf */
1142
2273
/* (Mainly meant for debugging) */
1143
2274
char *address = strrchr(connect_to, ':');
1144
2276
if(address == NULL){
1145
fprintf(stderr, "No colon in address\n");
1146
exitcode = EXIT_FAILURE;
1150
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1151
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1152
or address[numchars+1] != '\0'){
1153
fprintf(stderr, "Bad port number\n");
1154
exitcode = EXIT_FAILURE;
1157
port = (uint16_t)tmpmax;
2277
fprintf_plus(stderr, "No colon in address\n");
2278
exitcode = EX_USAGE;
2288
tmpmax = strtoimax(address+1, &tmp, 10);
2289
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2290
or tmpmax != (in_port_t)tmpmax){
2291
fprintf_plus(stderr, "Bad port number\n");
2292
exitcode = EX_USAGE;
2300
port = (in_port_t)tmpmax;
1158
2301
*address = '\0';
1159
address = connect_to;
1160
2302
/* Colon in address indicates IPv6 */
1162
if(strchr(address, ':') != NULL){
2304
if(strchr(connect_to, ':') != NULL){
2306
/* Accept [] around IPv6 address - see RFC 5952 */
2307
if(connect_to[0] == '[' and address[-1] == ']')
1167
ret = start_mandos_communication(address, port, if_index, af);
1169
exitcode = EXIT_FAILURE;
2315
address = connect_to;
2321
while(not quit_now){
2322
ret = start_mandos_communication(address, port, if_index, af,
2324
if(quit_now or ret == 0){
2328
fprintf_plus(stderr, "Retrying in %d seconds\n",
2329
(int)retry_interval);
2331
sleep((int)retry_interval);
1171
2335
exitcode = EXIT_SUCCESS;
1177
avahi_set_log_function(empty_log);
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;