156
161
const char *priority;
158
163
server *current_server;
165
size_t interfaces_size;
159
166
} mandos_context;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
167
171
sig_atomic_t quit_now = 0;
168
172
int signal_received = 0;
170
174
/* Function to use when printing errors */
171
175
void perror_plus(const char *print_text){
172
177
fprintf(stderr, "Mandos plugin %s: ",
173
178
program_invocation_short_name);
174
180
perror(print_text);
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
186
va_start (ap, format);
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
178
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
195
* bytes. "buffer_capacity" is how much is currently allocated,
207
228
if(new_server->ip == NULL){
208
229
perror_plus("strdup");
211
232
/* Special case of first server */
212
if (mc.current_server == NULL){
233
if(*current_server == NULL){
213
234
new_server->next = new_server;
214
235
new_server->prev = new_server;
215
mc.current_server = new_server;
236
*current_server = new_server;
216
237
/* Place the new server last in the list */
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
220
241
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
242
(*current_server)->prev = new_server;
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
225
246
perror_plus("clock_gettime");
232
253
* Initialize GPGME.
234
255
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
256
const char *tempdir, mandos_context *mc){
236
257
gpgme_error_t rc;
237
258
gpgme_engine_info_t engine_info;
241
261
* Helper function to insert pub and seckey to the engine keyring.
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
297
fprintf_plus(stderr, "Initializing GPGME\n");
284
301
gpgme_check_version(NULL);
285
302
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
303
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
304
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
305
gpgme_strsource(rc), gpgme_strerror(rc));
293
309
/* Set GPGME home directory for the OpenPGP engine only */
294
310
rc = gpgme_get_engine_info(&engine_info);
295
311
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
301
316
while(engine_info != NULL){
342
358
ssize_t plaintext_length = 0;
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
361
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
349
364
/* Create new GPGME data buffer from memory cryptotext */
350
365
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
367
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
369
gpgme_strsource(rc), gpgme_strerror(rc));
359
373
/* Create new empty GPGME data buffer for the plaintext */
360
374
rc = gpgme_data_new(&dh_plain);
361
375
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "Mandos plugin mandos-client: "
377
"bad gpgme_data_new: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
365
379
gpgme_data_release(dh_crypto);
369
383
/* Decrypt data from the cryptotext data buffer to the plaintext
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
386
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
376
389
plaintext_length = -1;
378
391
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
392
result = gpgme_op_decrypt_result(mc->ctx);
380
393
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
396
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
397
result->unsupported_algorithm);
398
fprintf_plus(stderr, "Wrong key usage: %u\n",
399
result->wrong_key_usage);
390
400
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
401
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
403
gpgme_recipient_t recipient;
395
404
recipient = result->recipients;
396
405
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
406
fprintf_plus(stderr, "Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name
408
(recipient->pubkey_algo));
409
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
410
fprintf_plus(stderr, "Secret key available: %s\n",
411
recipient->status == GPG_ERR_NO_SECKEY
406
413
recipient = recipient->next;
508
512
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
514
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
safer_gnutls_strerror(ret));
513
517
gnutls_global_deinit();
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
523
" secret key %s as GnuTLS credentials\n",
524
528
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
529
(mc->cred, pubkeyfilename, seckeyfilename,
526
530
GNUTLS_OPENPGP_FMT_BASE64);
527
531
if(ret != GNUTLS_E_SUCCESS){
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
533
"Error[%d] while reading the OpenPGP key pair ('%s',"
534
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
535
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
536
safer_gnutls_strerror(ret));
537
540
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
541
ret = gnutls_dh_params_init(&mc->dh_params);
539
542
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
" initialization: %s\n",
545
safer_gnutls_strerror(ret));
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
549
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
559
gnutls_certificate_free_credentials(mc.cred);
561
gnutls_certificate_free_credentials(mc->cred);
560
562
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
563
gnutls_dh_params_deinit(mc->dh_params);
565
static int init_gnutls_session(gnutls_session_t *session){
567
static int init_gnutls_session(gnutls_session_t *session,
567
570
/* GnuTLS session creation */
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
667
ret = init_gnutls_session(&session);
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
675
if(if_nametoindex(interface) == (unsigned int)if_index){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
689
fprintf_plus(stderr, "Skipping server on non-used interface"
691
if_indextoname((unsigned int)if_index,
699
ret = init_gnutls_session(&session, mc);
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
678
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1043
1072
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1073
avahi_address_snprint(ip, sizeof(ip), address);
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
ip, (intmax_t)interface, port);
1075
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1076
PRIdMAX ") on port %" PRIu16 "\n", name,
1077
host_name, ip, (intmax_t)interface, port);
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1081
avahi_proto_to_af(proto),
1054
avahi_simple_poll_quit(mc.simple_poll);
1084
avahi_simple_poll_quit(simple_poll);
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1086
if(not add_server(ip, (in_port_t)port, interface,
1087
avahi_proto_to_af(proto),
1088
&((mandos_context*)mc)->current_server)){
1089
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1156
1199
/* Reject the loopback device */
1157
1200
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1202
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1164
1207
/* Accept point-to-point devices only if connect_to is specified */
1165
1208
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1210
fprintf_plus(stderr, "Accepting point-to-point interface"
1211
" \"%s\"\n", ifname);
1172
1215
/* Otherwise, reject non-broadcast-capable devices */
1173
1216
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1218
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1219
" \"%s\"\n", ifname);
1180
1223
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1224
if(ifr->ifr_flags & IFF_NOARP){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1226
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1189
1232
/* Accept this device */
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1234
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1207
1249
struct ifreq ifr;
1208
1250
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1217
if(not good_flags(if_entry->d_name, &ifr)){
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1234
if(not get_flags(if_entry->d_name, &ifr)){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1263
if(not good_flags(if_entry->d_name, &ifr)){
1252
fprintf_plus(stderr, "Failed to get flags for interface "
1253
"\"%s\"\n", if_entry->d_name);
1258
if(not good_flags(if_entry->d_name, &ifr)){
1265
* This function determines if a network interface is up.
1267
bool interface_is_up(const char *interface){
1269
if(not get_flags(interface, &ifr)){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1281
* This function determines if a network interface is running
1283
bool interface_is_running(const char *interface){
1285
if(not get_flags(interface, &ifr)){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1293
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1269
1296
int notdotentries(const struct dirent *direntry){
1319
1345
if(not (S_ISREG(st.st_mode))){
1320
1346
/* Not a regular file */
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1348
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1328
1353
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1354
/* Not executable */
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1356
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1362
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1342
1371
struct timespec now;
1343
1372
struct timespec waited_time;
1344
1373
intmax_t block_time;
1347
if(mc.current_server == NULL){
1376
if(mc->current_server == NULL){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1378
fprintf_plus(stderr, "Wait until first server is found."
1352
1381
ret = avahi_simple_poll_iterate(s, -1);
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1384
fprintf_plus(stderr, "Check current_server if we should run"
1359
1387
/* the current time */
1360
1388
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1447
perror_plus("seteuid");
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1461
if(setuid(0) == -1){
1463
perror_plus("seteuid");
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1475
perror_plus("seteuid");
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1487
perror_plus("setuid");
1493
bool run_network_hooks(const char *mode, const char *interface,
1495
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1499
if(errno == ENOENT){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1505
perror_plus("scandir");
1508
struct dirent *direntry;
1510
int devnull = open("/dev/null", O_RDONLY);
1511
for(int i = 0; i < numhooks; i++){
1512
direntry = direntries[i];
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1516
perror_plus("asprintf");
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1523
pid_t hook_pid = fork();
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1532
perror_plus("setgid");
1534
/* Reset supplementary groups */
1536
ret = setgroups(0, NULL);
1538
perror_plus("setgroups");
1540
dup2(devnull, STDIN_FILENO);
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1545
perror_plus("setenv");
1548
ret = setenv("DEVICE", interface, 1);
1550
perror_plus("setenv");
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1555
perror_plus("setenv");
1558
ret = setenv("MODE", mode, 1);
1560
perror_plus("setenv");
1564
ret = asprintf(&delaystring, "%f", delay);
1566
perror_plus("asprintf");
1569
ret = setenv("DELAY", delaystring, 1);
1572
perror_plus("setenv");
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1579
perror_plus("setenv");
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1590
perror_plus("waitpid");
1594
if(WIFEXITED(status)){
1595
if(WEXITSTATUS(status) != 0){
1596
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1597
" with status %d\n", direntry->d_name,
1598
WEXITSTATUS(status));
1602
} else if(WIFSIGNALED(status)){
1603
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1604
" signal %d\n", direntry->d_name,
1609
fprintf_plus(stderr, "Warning: network hook \"%s\""
1610
" crashed\n", direntry->d_name);
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1626
error_t bring_up_interface(const char *const interface,
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1652
network.ifr_flags |= IFF_UP;
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1657
perror_plus("socket");
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1673
/* Raise priviliges */
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1695
#endif /* __linux__ */
1697
/* Lower privileges */
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1703
perror_plus("close");
1706
if(ret_setflags == -1){
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1756
perror_plus("socket");
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1766
/* Raise priviliges */
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1772
/* Lower privileges */
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1778
perror_plus("close");
1781
if(ret_setflags == -1){
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1413
1796
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
1414
1801
AvahiSServiceBrowser *sb = NULL;
1417
1804
intmax_t tmpmax;
1419
1806
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
1421
struct ifreq network;
1423
bool take_down_interface = false;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1426
1809
char tempdir[] = "/tmp/mandosXXXXXX";
1427
1810
bool tempdir_created = false;
1428
1811
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
1812
const char *seckey = PATHDIR "/" SECKEY;
1430
1813
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1432
1816
bool gnutls_initialized = false;
1433
1817
bool gpgme_initialized = false;
1608
1995
/* Work around Debian bug #633582:
1609
1996
<http://bugs.debian.org/633582> */
1612
1998
/* Re-raise priviliges */
1616
perror_plus("seteuid");
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1626
perror_plus("fstat");
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1631
perror_plus("fchown");
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1646
perror_plus("fstat");
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1651
perror_plus("fchown");
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1659
/* Lower privileges */
1663
perror_plus("seteuid");
1667
/* Find network hooks and run them */
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1674
perror_plus("scandir");
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1682
perror_plus("asprintf");
1685
pid_t hook_pid = fork();
1688
dup2(devnull, STDIN_FILENO);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1693
perror_plus("setenv");
1696
ret = setenv("DEVICE", interface, 1);
1698
perror_plus("setenv");
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1703
perror_plus("setenv");
1706
ret = setenv("MODE", "start", 1);
1708
perror_plus("setenv");
1712
ret = asprintf(&delaystring, "%f", delay);
1714
perror_plus("asprintf");
1717
ret = setenv("DELAY", delaystring, 1);
1720
perror_plus("setenv");
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1999
if(raise_privileges() == 0){
2002
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2003
int seckey_fd = open(seckey, O_RDONLY);
2004
if(seckey_fd == -1){
2005
perror_plus("open");
2007
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2009
perror_plus("fstat");
2011
if(S_ISREG(st.st_mode)
2012
and st.st_uid == 0 and st.st_gid == 0){
2013
ret = fchown(seckey_fd, uid, gid);
2015
perror_plus("fchown");
2019
TEMP_FAILURE_RETRY(close(seckey_fd));
2023
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2024
int pubkey_fd = open(pubkey, O_RDONLY);
2025
if(pubkey_fd == -1){
2026
perror_plus("open");
2028
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2030
perror_plus("fstat");
2032
if(S_ISREG(st.st_mode)
2033
and st.st_uid == 0 and st.st_gid == 0){
2034
ret = fchown(pubkey_fd, uid, gid);
2036
perror_plus("fchown");
2040
TEMP_FAILURE_RETRY(close(pubkey_fd));
2044
/* Lower privileges */
2049
/* Remove invalid interface names (except "none") */
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2066
/* Run network hooks */
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
1767
2084
avahi_set_log_function(empty_log);
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1776
/* No up interfaces, look for any good interfaces */
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1788
if(interface == NULL){
1789
perror_plus("malloc");
1791
exitcode = EXIT_FAILURE;
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1804
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
2088
from the signal handler */
1806
2089
/* Initialize the pseudo-RNG for Avahi */
1807
2090
srand((unsigned int) time(NULL));
1808
mc.simple_poll = avahi_simple_poll_new();
1809
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
1812
2095
exitcode = EX_UNAVAILABLE;
1879
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1893
/* Re-raise priviliges */
1897
perror_plus("seteuid");
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1903
ret = klogctl(8, NULL, 5);
1904
bool restore_loglevel = true;
1906
restore_loglevel = false;
1907
perror_plus("klogctl");
1909
#endif /* __linux__ */
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1916
if(restore_loglevel){
1917
ret = klogctl(7, NULL, 0);
1919
perror_plus("klogctl");
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1927
perror_plus("seteuid");
1931
strcpy(network.ifr_name, interface);
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1934
perror_plus("ioctl SIOCGIFFLAGS");
1936
if(restore_loglevel){
1937
ret = klogctl(7, NULL, 0);
1939
perror_plus("klogctl");
1942
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1948
perror_plus("seteuid");
1952
if((network.ifr_flags & IFF_UP) == 0){
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1961
if(restore_loglevel){
1962
ret = klogctl(7, NULL, 0);
1964
perror_plus("klogctl");
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);
2175
perror_plus("argz_add");
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2192
/* Bring up interfaces which are down, and remove any "none"s */
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1972
perror_plus("seteuid");
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1979
for(int i=0; i < delay * 4; i++){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_RUNNING){
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
ret = nanosleep(&sleeptime, NULL);
1988
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1996
perror_plus("close");
2000
if(restore_loglevel){
2001
/* Restores kernel loglevel to default */
2002
ret = klogctl(7, NULL, 0);
2004
perror_plus("klogctl");
2007
#endif /* __linux__ */
2008
/* Lower privileges */
2010
if(take_down_interface){
2011
/* Lower privileges */
2014
perror_plus("seteuid");
2017
/* Lower privileges permanently */
2020
perror_plus("setuid");
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2218
perror_plus("Failed to bring up interface");
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2225
perror_plus("argz_add");
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2029
ret = init_gnutls_global(pubkey, seckey);
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2251
exitcode = EX_UNAVAILABLE;
2187
2402
/* Run the main loop */
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2405
fprintf_plus(stderr, "Starting Avahi loop search\n");
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2411
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
(ret == 0) ? "successfully" : "with error");
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
2418
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2209
2421
/* Cleanup things */
2422
free(mc.interfaces);
2211
2425
avahi_s_service_browser_free(sb);
2213
2427
if(mc.server != NULL)
2214
2428
avahi_server_free(mc.server);
2216
if(mc.simple_poll != NULL)
2217
avahi_simple_poll_free(mc.simple_poll);
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
2219
2433
if(gnutls_initialized){
2220
2434
gnutls_certificate_free_credentials(mc.cred);
2240
/* XXX run network hooks "stop" here */
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2248
perror_plus("seteuid");
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2454
/* Re-raise priviliges */
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2462
/* Take down the network interfaces which were brought up */
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2468
ret_errno = take_down_interface(interface);
2471
perror_plus("Failed to take down interface");
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2263
perror_plus("close");
2265
/* Lower privileges permanently */
2269
perror_plus("setuid");
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
lower_privileges_permanently();
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2274
2486
/* Removes the GPGME temp directory and all files inside */
2275
2487
if(tempdir_created){
2276
2488
struct dirent **direntries = NULL;