166
156
const char *priority;
168
158
server *current_server;
170
size_t interfaces_size;
171
159
} mandos_context;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
176
167
sig_atomic_t quit_now = 0;
177
168
int signal_received = 0;
179
170
/* Function to use when printing errors */
180
171
void perror_plus(const char *print_text){
182
172
fprintf(stderr, "Mandos plugin %s: ",
183
173
program_invocation_short_name);
185
174
perror(print_text);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
179
* bytes. "buffer_capacity" is how much is currently allocated,
201
180
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
182
size_t incbuffer(char **buffer, size_t buffer_length,
205
183
size_t buffer_capacity){
206
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
189
buffer_capacity += BUFFER_SIZE;
218
191
return buffer_capacity;
221
194
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
226
198
server *new_server = malloc(sizeof(server));
227
199
if(new_server == NULL){
228
200
perror_plus("malloc");
231
203
*new_server = (server){ .ip = strdup(ip),
235
207
if(new_server->ip == NULL){
236
208
perror_plus("strdup");
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
254
211
/* Special case of first server */
255
if(*current_server == NULL){
212
if (mc.current_server == NULL){
256
213
new_server->next = new_server;
257
214
new_server->prev = new_server;
258
*current_server = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
263
220
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
221
mc.current_server->prev = new_server;
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
perror_plus("clock_gettime");
270
232
* Initialize GPGME.
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
277
236
gpgme_error_t rc;
278
237
gpgme_engine_info_t engine_info;
281
241
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
243
bool import_key(const char *filename){
286
246
gpgme_data_t pgp_data;
379
342
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
385
349
/* Create new GPGME data buffer from memory cryptotext */
386
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
388
352
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
394
359
/* Create new empty GPGME data buffer for the plaintext */
395
360
rc = gpgme_data_new(&dh_plain);
396
361
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
400
365
gpgme_data_release(dh_crypto);
404
369
/* Decrypt data from the cryptotext data buffer to the plaintext
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
372
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
410
376
plaintext_length = -1;
412
378
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
379
result = gpgme_op_decrypt_result(mc.ctx);
414
380
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
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);
421
390
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
424
394
gpgme_recipient_t recipient;
425
395
recipient = result->recipients;
426
396
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
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
434
406
recipient = recipient->next;
536
508
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
510
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
541
513
gnutls_global_deinit();
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
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,
552
524
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
554
526
GNUTLS_OPENPGP_FMT_BASE64);
555
527
if(ret != GNUTLS_E_SUCCESS){
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
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));
564
537
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
538
ret = gnutls_dh_params_init(&mc.dh_params);
566
539
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
546
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
585
gnutls_certificate_free_credentials(mc->cred);
559
gnutls_certificate_free_credentials(mc.cred);
586
560
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
561
gnutls_dh_params_deinit(mc.dh_params);
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
565
static int init_gnutls_session(gnutls_session_t *session){
595
567
/* GnuTLS session creation */
790
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
745
perror_plus("if_indextoname");
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
800
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
802
758
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
766
perror_plus("inet_ntop");
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
1187
1126
signal_received = sig;
1188
1127
int old_errno = errno;
1189
1128
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1193
1132
errno = old_errno;
1196
__attribute__((nonnull, warn_unused_result))
1197
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1201
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1204
1140
perror_plus("socket");
1208
1143
strcpy(ifr->ifr_name, ifname);
1209
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1213
1147
perror_plus("ioctl SIOCGIFFLAGS");
1221
__attribute__((nonnull, warn_unused_result))
1222
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1224
1156
/* Reject the loopback device */
1225
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1232
1164
/* Accept point-to-point devices only if connect_to is specified */
1233
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1240
1172
/* Otherwise, reject non-broadcast-capable devices */
1241
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1248
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1249
1181
if(ifr->ifr_flags & IFF_NOARP){
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1257
1189
/* Accept this device */
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1275
1207
struct ifreq ifr;
1276
1208
if(not get_flags(if_entry->d_name, &ifr)){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1284
if(not good_flags(if_entry->d_name, &ifr)){
1291
* This function determines if a network interface is up.
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1296
if(not get_flags(interface, &ifr)){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1308
* This function determines if a network interface is running
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1313
if(not get_flags(interface, &ifr)){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1324
__attribute__((nonnull, pure, warn_unused_result))
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)){
1325
1269
int notdotentries(const struct dirent *direntry){
1326
1270
/* Skip "." and ".." */
1327
1271
if(direntry->d_name[0] == '.'
1455
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1458
if(ret > 0 or errno != EINTR){
1406
if (ret > 0 or errno != EINTR){
1459
1407
return (ret != 1) ? ret : 0;
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1486
if(setuid(0) == -1){
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1530
perror_plus("open");
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1546
#endif /* not __GLIBC__ */
1548
perror_plus("scandir");
1551
struct dirent *direntry;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1560
pid_t hook_pid = fork();
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1566
perror_plus("Failed to raise privileges");
1573
perror_plus("setgid");
1576
/* Reset supplementary groups */
1578
ret = setgroups(0, NULL);
1580
perror_plus("setgroups");
1583
ret = dup2(devnull, STDIN_FILENO);
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1588
ret = close(devnull);
1590
perror_plus("close");
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1600
perror_plus("setenv");
1603
ret = setenv("DEVICE", interface, 1);
1605
perror_plus("setenv");
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1610
perror_plus("setenv");
1613
ret = setenv("MODE", mode, 1);
1615
perror_plus("setenv");
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1621
perror_plus("asprintf");
1624
ret = setenv("DELAY", delaystring, 1);
1627
perror_plus("setenv");
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1634
perror_plus("setenv");
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
perror_plus("waitpid");
1659
if(WIFEXITED(status)){
1660
if(WEXITSTATUS(status) != 0){
1661
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1662
" with status %d\n", direntry->d_name,
1663
WEXITSTATUS(status));
1667
} else if(WIFSIGNALED(status)){
1668
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1669
" signal %d\n", direntry->d_name,
1674
fprintf_plus(stderr, "Warning: network hook \"%s\""
1675
" crashed\n", direntry->d_name);
1681
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1688
perror_plus("close");
1695
__attribute__((nonnull, warn_unused_result))
1696
error_t bring_up_interface(const char *const interface,
1698
error_t old_errno = errno;
1700
struct ifreq network;
1701
unsigned int if_index = if_nametoindex(interface);
1703
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1713
if(not interface_is_up(interface)){
1714
error_t ret_errno = 0, ioctl_errno = 0;
1715
if(not get_flags(interface, &network)){
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", interface);
1722
network.ifr_flags |= IFF_UP; /* set flag */
1724
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1727
perror_plus("socket");
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1735
perror_plus("close");
1742
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1746
/* Raise privileges */
1747
ret_errno = raise_privileges();
1750
perror_plus("Failed to raise privileges");
1755
bool restore_loglevel = false;
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret_linux = klogctl(8, NULL, 5);
1760
if(ret_linux == -1){
1761
perror_plus("klogctl");
1763
restore_loglevel = true;
1766
#endif /* __linux__ */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ioctl_errno = errno;
1770
if(restore_loglevel){
1771
ret_linux = klogctl(7, NULL, 0);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1776
#endif /* __linux__ */
1778
/* If raise_privileges() succeeded above */
1780
/* Lower privileges */
1781
ret_errno = lower_privileges();
1784
perror_plus("Failed to lower privileges");
1788
/* Close the socket */
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1791
perror_plus("close");
1794
if(ret_setflags == -1){
1795
errno = ioctl_errno;
1796
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1801
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1805
/* Sleep checking until interface is running.
1806
Check every 0.25s, up to total time of delay */
1807
for(int i=0; i < delay * 4; i++){
1808
if(interface_is_running(interface)){
1811
struct timespec sleeptime = { .tv_nsec = 250000000 };
1812
ret = nanosleep(&sleeptime, NULL);
1813
if(ret == -1 and errno != EINTR){
1814
perror_plus("nanosleep");
1822
__attribute__((nonnull, warn_unused_result))
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
1825
struct ifreq network;
1826
unsigned int if_index = if_nametoindex(interface);
1828
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1832
if(interface_is_up(interface)){
1833
error_t ret_errno = 0, ioctl_errno = 0;
1834
if(not get_flags(interface, &network) and debug){
1836
fprintf_plus(stderr, "Failed to get flags for interface "
1837
"\"%s\"\n", interface);
1841
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1843
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1846
perror_plus("socket");
1852
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1856
/* Raise privileges */
1857
ret_errno = raise_privileges();
1860
perror_plus("Failed to raise privileges");
1863
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1864
ioctl_errno = errno;
1866
/* If raise_privileges() succeeded above */
1868
/* Lower privileges */
1869
ret_errno = lower_privileges();
1872
perror_plus("Failed to lower privileges");
1876
/* Close the socket */
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1879
perror_plus("close");
1882
if(ret_setflags == -1){
1883
errno = ioctl_errno;
1884
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1889
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1897
1413
int main(int argc, char *argv[]){
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
1902
1414
AvahiSServiceBrowser *sb = NULL;
1905
1417
intmax_t tmpmax;
1907
1419
int exitcode = EXIT_SUCCESS;
1908
char *interfaces_to_take_down = NULL;
1909
size_t interfaces_to_take_down_size = 0;
1910
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1911
char old_tempdir[] = "/tmp/mandosXXXXXX";
1912
char *tempdir = NULL;
1420
const char *interface = "";
1421
struct ifreq network;
1423
bool take_down_interface = false;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
1913
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1914
1429
const char *seckey = PATHDIR "/" SECKEY;
1915
1430
const char *pubkey = PATHDIR "/" PUBKEY;
1916
char *interfaces_hooks = NULL;
1918
1432
bool gnutls_initialized = false;
1919
1433
bool gpgme_initialized = false;
2097
1608
/* Work around Debian bug #633582:
2098
1609
<http://bugs.debian.org/633582> */
2100
/* Re-raise privileges */
2101
ret_errno = raise_privileges();
2104
perror_plus("Failed to raise privileges");
1612
/* 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");
2108
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2109
int seckey_fd = open(seckey, O_RDONLY);
2110
if(seckey_fd == -1){
2111
perror_plus("open");
2113
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2115
perror_plus("fstat");
2117
if(S_ISREG(st.st_mode)
2118
and st.st_uid == 0 and st.st_gid == 0){
2119
ret = fchown(seckey_fd, uid, gid);
2121
perror_plus("fchown");
2125
TEMP_FAILURE_RETRY(close(seckey_fd));
2129
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2130
int pubkey_fd = open(pubkey, O_RDONLY);
2131
if(pubkey_fd == -1){
2132
perror_plus("open");
2134
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2136
perror_plus("fstat");
2138
if(S_ISREG(st.st_mode)
2139
and st.st_uid == 0 and st.st_gid == 0){
2140
ret = fchown(pubkey_fd, uid, gid);
2142
perror_plus("fchown");
2146
TEMP_FAILURE_RETRY(close(pubkey_fd));
2150
/* Lower privileges */
2151
ret_errno = lower_privileges();
2154
perror_plus("Failed to lower privileges");
2159
/* Remove invalid interface names (except "none") */
2161
char *interface = NULL;
2162
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2164
if(strcmp(interface, "none") != 0
2165
and if_nametoindex(interface) == 0){
2166
if(interface[0] != '\0'){
2167
fprintf_plus(stderr, "Not using nonexisting interface"
2168
" \"%s\"\n", interface);
2170
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2176
/* Run network hooks */
2178
if(mc.interfaces != NULL){
2179
interfaces_hooks = malloc(mc.interfaces_size);
2180
if(interfaces_hooks == NULL){
2181
perror_plus("malloc");
2184
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2185
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2187
run_network_hooks("start", interfaces_hooks != NULL ?
2188
interfaces_hooks : "", delay);
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("DEVICE", interface, 1);
1693
perror_plus("setenv");
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1698
perror_plus("setenv");
1701
ret = setenv("MODE", "start", 1);
1703
perror_plus("setenv");
1707
ret = asprintf(&delaystring, "%f", delay);
1709
perror_plus("asprintf");
1712
ret = setenv("DELAY", delaystring, 1);
1715
perror_plus("setenv");
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
2192
1762
avahi_set_log_function(empty_log);
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1771
/* No up interfaces, look for any good interfaces */
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1783
if(interface == NULL){
1784
perror_plus("malloc");
1786
exitcode = EXIT_FAILURE;
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
2195
1799
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2196
1800
from the signal handler */
2197
1801
/* Initialize the pseudo-RNG for Avahi */
2198
1802
srand((unsigned int) time(NULL));
2199
simple_poll = avahi_simple_poll_new();
2200
if(simple_poll == NULL){
2201
fprintf_plus(stderr,
2202
"Avahi: Failed to create simple poll object.\n");
1803
mc.simple_poll = avahi_simple_poll_new();
1804
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
2203
1807
exitcode = EX_UNAVAILABLE;
2270
/* If no interfaces were specified, make a list */
2271
if(mc.interfaces == NULL){
2272
struct dirent **direntries = NULL;
2273
/* Look for any good interfaces */
2274
ret = scandir(sys_class_net, &direntries, good_interface,
2277
/* Add all found interfaces to interfaces list */
2278
for(int i = 0; i < ret; ++i){
2279
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2280
direntries[i]->d_name);
2283
perror_plus("argz_add");
2284
free(direntries[i]);
2288
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2289
direntries[i]->d_name);
2291
free(direntries[i]);
1874
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1888
/* Re-raise priviliges */
1892
perror_plus("seteuid");
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1898
ret = klogctl(8, NULL, 5);
1899
bool restore_loglevel = true;
1901
restore_loglevel = false;
1902
perror_plus("klogctl");
1904
#endif /* __linux__ */
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1911
if(restore_loglevel){
1912
ret = klogctl(7, NULL, 0);
1914
perror_plus("klogctl");
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1922
perror_plus("seteuid");
1926
strcpy(network.ifr_name, interface);
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1929
perror_plus("ioctl SIOCGIFFLAGS");
1931
if(restore_loglevel){
1932
ret = klogctl(7, NULL, 0);
1934
perror_plus("klogctl");
1937
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1943
perror_plus("seteuid");
1947
if((network.ifr_flags & IFF_UP) == 0){
1948
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1956
if(restore_loglevel){
1957
ret = klogctl(7, NULL, 0);
1959
perror_plus("klogctl");
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1967
perror_plus("seteuid");
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1974
for(int i=0; i < delay * 4; i++){
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1977
perror_plus("ioctl SIOCGIFFLAGS");
1978
} else if(network.ifr_flags & IFF_RUNNING){
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
ret = nanosleep(&sleeptime, NULL);
1983
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
perror_plus("close");
1995
if(restore_loglevel){
1996
/* Restores kernel loglevel to default */
1997
ret = klogctl(7, NULL, 0);
1999
perror_plus("klogctl");
2002
#endif /* __linux__ */
2003
/* Lower privileges */
2005
if(take_down_interface){
2006
/* Lower privileges */
2009
perror_plus("seteuid");
2298
fprintf_plus(stderr, "Could not find a network interface\n");
2299
exitcode = EXIT_FAILURE;
2304
/* Bring up interfaces which are down, and remove any "none"s */
2306
char *interface = NULL;
2307
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2309
/* If interface name is "none", stop bringing up interfaces.
2310
Also remove all instances of "none" from the list */
2311
if(strcmp(interface, "none") == 0){
2312
argz_delete(&mc.interfaces, &mc.interfaces_size,
2315
while((interface = argz_next(mc.interfaces,
2316
mc.interfaces_size, interface))){
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2325
bool interface_was_up = interface_is_up(interface);
2326
errno = bring_up_interface(interface, delay);
2327
if(not interface_was_up){
2329
perror_plus("Failed to bring up interface");
2331
errno = argz_add(&interfaces_to_take_down,
2332
&interfaces_to_take_down_size,
2335
perror_plus("argz_add");
2340
if(debug and (interfaces_to_take_down == NULL)){
2341
fprintf_plus(stderr, "No interfaces were brought up\n");
2345
/* If we only got one interface, explicitly use only that one */
2346
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2348
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2351
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
/* Lower privileges permanently */
2015
perror_plus("setuid");
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
2024
ret = init_gnutls_global(pubkey, seckey);
2360
fprintf_plus(stderr, "init_gnutls_global failed\n");
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2361
2028
exitcode = EX_UNAVAILABLE;
2557
2220
if(gpgme_initialized){
2558
2221
gpgme_release(mc.ctx);
2561
2224
/* Cleans up the circular linked list of Mandos servers the client
2563
2226
if(mc.current_server != NULL){
2564
2227
mc.current_server->prev->next = NULL;
2565
2228
while(mc.current_server != NULL){
2566
2229
server *next = mc.current_server->next;
2568
#pragma GCC diagnostic push
2569
#pragma GCC diagnostic ignored "-Wcast-qual"
2571
free((char *)(mc.current_server->ip));
2573
#pragma GCC diagnostic pop
2575
2230
free(mc.current_server);
2576
2231
mc.current_server = next;
2580
/* Re-raise privileges */
2582
ret_errno = raise_privileges();
2585
perror_plus("Failed to raise privileges");
2588
/* Run network hooks */
2589
run_network_hooks("stop", interfaces_hooks != NULL ?
2590
interfaces_hooks : "", delay);
2592
/* Take down the network interfaces which were brought up */
2594
char *interface = NULL;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2598
ret_errno = take_down_interface(interface);
2601
perror_plus("Failed to take down interface");
2604
if(debug and (interfaces_to_take_down == NULL)){
2605
fprintf_plus(stderr, "No interfaces needed to be taken"
2235
/* XXX run network hooks "stop" here */
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2243
perror_plus("seteuid");
2611
ret_errno = lower_privileges_permanently();
2614
perror_plus("Failed to lower privileges permanently");
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2258
perror_plus("close");
2260
/* Lower privileges permanently */
2264
perror_plus("setuid");
2618
free(interfaces_to_take_down);
2619
free(interfaces_hooks);
2621
2269
/* Removes the GPGME temp directory and all files inside */
2622
if(tempdir != NULL){
2270
if(tempdir_created){
2623
2271
struct dirent **direntries = NULL;
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2649
free(direntries[i]);
2652
/* need to clean even if 0 because man page doesn't specify */
2654
if(numentries == -1){
2655
perror_plus("scandir");
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
2278
char *fullname = NULL;
2279
ret = asprintf(&fullname, "%s/%s", tempdir,
2282
perror_plus("asprintf");
2285
ret = remove(fullname);
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2294
/* need to clean even if 0 because man page doesn't specify */
2296
if (numentries == -1){
2297
perror_plus("scandir");
2299
ret = rmdir(tempdir);
2300
if(ret == -1 and errno != ENOENT){
2301
perror_plus("rmdir");