229
236
perror_plus("strdup");
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
perror_plus("clock_gettime");
232
244
/* Special case of first server */
233
245
if(*current_server == NULL){
234
246
new_server->next = new_server;
235
247
new_server->prev = new_server;
236
248
*current_server = new_server;
237
/* Place the new server last in the list */
250
/* Place the new server last in the list */
239
251
new_server->next = *current_server;
240
252
new_server->prev = (*current_server)->prev;
241
253
new_server->prev->next = new_server;
242
254
(*current_server)->prev = new_server;
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
246
perror_plus("clock_gettime");
253
260
* Initialize GPGME.
255
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
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,
257
267
gpgme_error_t rc;
258
268
gpgme_engine_info_t engine_info;
261
271
* Helper function to insert pub and seckey to the engine keyring.
263
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
266
276
gpgme_data_t pgp_data;
784
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
785
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
787
792
if(af == AF_INET6){
788
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
791
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
795
perror_plus("inet_ntop");
797
if(strcmp(addrstr, ip) != 0){
798
fprintf_plus(stderr, "Canonical address form: %s\n", 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);
1461
1475
if(setuid(0) == -1){
1462
1476
ret_errno = errno;
1463
perror_plus("seteuid");
1465
1478
errno = old_errno;
1466
1479
return ret_errno;
1469
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1470
1484
error_t lower_privileges(void){
1471
1485
error_t old_errno = errno;
1472
1486
error_t ret_errno = 0;
1473
1487
if(seteuid(uid) == -1){
1474
1488
ret_errno = errno;
1475
perror_plus("seteuid");
1477
1490
errno = old_errno;
1478
1491
return ret_errno;
1481
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1482
1496
error_t lower_privileges_permanently(void){
1483
1497
error_t old_errno = errno;
1484
1498
error_t ret_errno = 0;
1485
1499
if(setuid(uid) == -1){
1486
1500
ret_errno = errno;
1487
perror_plus("setuid");
1489
1502
errno = old_errno;
1490
1503
return ret_errno;
1493
bool run_network_hooks(const char *mode, const char *interface,
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1494
1508
const float delay){
1495
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
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__ */
1498
1536
if(numhooks == -1){
1499
if(errno == ENOENT){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1505
perror_plus("scandir");
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",
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);
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);
1516
1610
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");
1613
ret = setenv("DELAY", delaystring, 1);
1575
1615
free(delaystring);
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);
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,
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",
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");
1679
__attribute__((nonnull, warn_unused_result))
1626
1680
error_t bring_up_interface(const char *const interface,
1627
1681
const float delay){
1629
1682
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
1684
struct ifreq network;
1633
1685
unsigned int if_index = if_nametoindex(interface);
1634
1686
if(if_index == 0){
2454
/* Re-raise priviliges */
2554
/* Re-raise privileges */
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");
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
lower_privileges_permanently();
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");
2483
2592
free(interfaces_to_take_down);
2484
2593
free(interfaces_hooks);
2486
2595
/* Removes the GPGME temp directory and all files inside */
2487
if(tempdir_created){
2596
if(tempdir != NULL){
2488
2597
struct dirent **direntries = NULL;
2489
struct dirent *direntry = NULL;
2490
int numentries = scandir(tempdir, &direntries, notdotentries,
2492
if (numentries > 0){
2493
for(int i = 0; i < numentries; i++){
2494
direntry = direntries[i];
2495
char *fullname = NULL;
2496
ret = asprintf(&fullname, "%s/%s", tempdir,
2499
perror_plus("asprintf");
2502
ret = remove(fullname);
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
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");
2511
/* need to clean even if 0 because man page doesn't specify */
2513
if (numentries == -1){
2514
perror_plus("scandir");
2516
ret = rmdir(tempdir);
2517
if(ret == -1 and errno != ENOENT){
2518
perror_plus("rmdir");
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));