236
222
perror_plus("strdup");
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
perror_plus("clock_gettime");
244
225
/* Special case of first server */
245
226
if(*current_server == NULL){
246
227
new_server->next = new_server;
247
228
new_server->prev = new_server;
248
229
*current_server = new_server;
230
/* Place the new server last in the list */
250
/* Place the new server last in the list */
251
232
new_server->next = *current_server;
252
233
new_server->prev = (*current_server)->prev;
253
234
new_server->prev->next = new_server;
254
235
(*current_server)->prev = new_server;
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
239
perror_plus("clock_gettime");
260
246
* Initialize GPGME.
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
267
250
gpgme_error_t rc;
268
251
gpgme_engine_info_t engine_info;
271
254
* Helper function to insert pub and seckey to the engine keyring.
273
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
276
259
gpgme_data_t pgp_data;
790
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
792
744
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
752
perror_plus("inet_ntop");
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1475
1418
if(setuid(0) == -1){
1476
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1478
1422
errno = old_errno;
1479
1423
return ret_errno;
1482
1426
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
1427
error_t lower_privileges(void){
1485
1428
error_t old_errno = errno;
1486
1429
error_t ret_errno = 0;
1487
1430
if(seteuid(uid) == -1){
1488
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1490
1434
errno = old_errno;
1491
1435
return ret_errno;
1494
1438
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
1439
error_t lower_privileges_permanently(void){
1497
1440
error_t old_errno = errno;
1498
1441
error_t ret_errno = 0;
1499
1442
if(setuid(uid) == -1){
1500
1443
ret_errno = errno;
1444
perror_plus("setuid");
1502
1446
errno = old_errno;
1503
1447
return ret_errno;
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1450
bool run_network_hooks(const char *mode, const char *interface,
1508
1451
const float delay){
1509
struct dirent **direntries = NULL;
1510
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1512
if(hookdir_fd == -1){
1513
if(errno == ENOENT){
1515
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1516
" found\n", hookdir);
1519
perror_plus("open");
1525
#if __GLIBC_PREREQ(2, 15)
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1535
#endif /* not __GLIBC__ */
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1536
1457
if(numhooks == -1){
1537
perror_plus("scandir");
1540
struct dirent *direntry;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
for(int i = 0; i < numhooks; i++){
1544
direntry = direntries[i];
1546
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1458
if(errno == ENOENT){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1464
perror_plus("scandir");
1549
pid_t hook_pid = fork();
1552
/* Raise privileges */
1553
errno = raise_privileges_permanently();
1555
perror_plus("Failed to raise privileges");
1562
perror_plus("setgid");
1565
/* Reset supplementary groups */
1567
ret = setgroups(0, NULL);
1569
perror_plus("setgroups");
1572
ret = dup2(devnull, STDIN_FILENO);
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1577
ret = close(devnull);
1579
perror_plus("close");
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1589
perror_plus("setenv");
1592
ret = setenv("DEVICE", interface, 1);
1594
perror_plus("setenv");
1597
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1599
perror_plus("setenv");
1602
ret = setenv("MODE", mode, 1);
1604
perror_plus("setenv");
1608
ret = asprintf(&delaystring, "%f", (double)delay);
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1610
1473
perror_plus("asprintf");
1613
ret = setenv("DELAY", delaystring, 1);
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1480
pid_t hook_pid = fork();
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1489
perror_plus("setgid");
1491
/* Reset supplementary groups */
1493
ret = setgroups(0, NULL);
1495
perror_plus("setgroups");
1497
dup2(devnull, STDIN_FILENO);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1502
perror_plus("setenv");
1505
ret = setenv("DEVICE", interface, 1);
1507
perror_plus("setenv");
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1512
perror_plus("setenv");
1515
ret = setenv("MODE", mode, 1);
1517
perror_plus("setenv");
1521
ret = asprintf(&delaystring, "%f", delay);
1523
perror_plus("asprintf");
1526
ret = setenv("DELAY", delaystring, 1);
1529
perror_plus("setenv");
1615
1532
free(delaystring);
1616
perror_plus("setenv");
1620
if(connect_to != NULL){
1621
ret = setenv("CONNECT", connect_to, 1);
1623
perror_plus("setenv");
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1629
perror_plus("openat");
1630
_exit(EXIT_FAILURE);
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1633
perror_plus("close");
1634
_exit(EXIT_FAILURE);
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1638
perror_plus("fexecve");
1639
_exit(EXIT_FAILURE);
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
perror_plus("waitpid");
1647
if(WIFEXITED(status)){
1648
if(WEXITSTATUS(status) != 0){
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
" with status %d\n", direntry->d_name,
1651
WEXITSTATUS(status));
1654
} else if(WIFSIGNALED(status)){
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
" signal %d\n", direntry->d_name,
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1536
perror_plus("setenv");
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
" crashed\n", direntry->d_name);
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1672
perror_plus("close");
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1679
__attribute__((nonnull, warn_unused_result))
1680
1583
error_t bring_up_interface(const char *const interface,
1681
1584
const float delay){
1682
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1684
1589
struct ifreq network;
1685
1590
unsigned int if_index = if_nametoindex(interface);
1686
1591
if(if_index == 0){
1881
1755
int main(int argc, char *argv[]){
1882
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
1757
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1886
1759
AvahiSServiceBrowser *sb = NULL;
1887
1760
error_t ret_errno;
1889
1762
intmax_t tmpmax;
1891
1764
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1892
1767
char *interfaces_to_take_down = NULL;
1893
1768
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
1897
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
1772
const char *seckey = PATHDIR "/" SECKEY;
1899
1773
const char *pubkey = PATHDIR "/" PUBKEY;
1900
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1902
1777
bool gnutls_initialized = false;
1903
1778
bool gpgme_initialized = false;
2275
2149
free(direntries);
2280
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2281
2153
exitcode = EXIT_FAILURE;
2286
/* Bring up interfaces which are down, and remove any "none"s */
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2288
2170
char *interface = NULL;
2289
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2171
while((interface = argz_next(interfaces, interfaces_size,
2291
/* If interface name is "none", stop bringing up interfaces.
2292
Also remove all instances of "none" from the list */
2293
if(strcmp(interface, "none") == 0){
2294
argz_delete(&mc.interfaces, &mc.interfaces_size,
2297
while((interface = argz_next(mc.interfaces,
2298
mc.interfaces_size, interface))){
2299
if(strcmp(interface, "none") == 0){
2300
argz_delete(&mc.interfaces, &mc.interfaces_size,
2307
2173
bool interface_was_up = interface_is_up(interface);
2308
errno = bring_up_interface(interface, delay);
2174
ret = bring_up_interface(interface, delay);
2309
2175
if(not interface_was_up){
2311
2178
perror_plus("Failed to bring up interface");
2313
errno = argz_add(&interfaces_to_take_down,
2314
&interfaces_to_take_down_size,
2317
perror_plus("argz_add");
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2188
interfaces_size = 0;
2322
2189
if(debug and (interfaces_to_take_down == NULL)){
2323
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
2327
/* If we only got one interface, explicitly use only that one */
2328
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2330
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2333
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2554
/* Re-raise privileges */
2402
/* Re-raise priviliges */
2556
ret_errno = raise_privileges();
2559
perror_plus("Failed to raise privileges");
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2566
/* Take down the network interfaces which were brought up */
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2572
ret_errno = take_down_interface(interface);
2575
perror_plus("Failed to take down interface");
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2585
ret_errno = lower_privileges_permanently();
2588
perror_plus("Failed to lower privileges permanently");
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2410
/* Take down the network interfaces which were brought up */
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2416
ret_errno = take_down_interface(interface);
2419
perror_plus("Failed to take down interface");
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2428
lower_privileges_permanently();
2592
2431
free(interfaces_to_take_down);
2593
2432
free(interfaces_hooks);
2595
2434
/* Removes the GPGME temp directory and all files inside */
2596
if(tempdir != NULL){
2435
if(tempdir_created){
2597
2436
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2625
/* need to clean even if 0 because man page doesn't specify */
2627
if(numentries == -1){
2628
perror_plus("scandir");
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
2442
direntry = direntries[i];
2443
char *fullname = NULL;
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
2447
perror_plus("asprintf");
2450
ret = remove(fullname);
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2459
/* need to clean even if 0 because man page doesn't specify */
2461
if (numentries == -1){
2462
perror_plus("scandir");
2464
ret = rmdir(tempdir);
2465
if(ret == -1 and errno != ENOENT){
2466
perror_plus("rmdir");