256
227
new_server->next = new_server;
257
228
new_server->prev = new_server;
258
229
*current_server = new_server;
230
/* Place the new server last in the list */
260
/* Place the new server last in the list */
261
232
new_server->next = *current_server;
262
233
new_server->prev = (*current_server)->prev;
263
234
new_server->prev->next = new_server;
264
235
(*current_server)->prev = new_server;
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
239
perror_plus("clock_gettime");
270
246
* 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,
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
277
250
gpgme_error_t rc;
278
251
gpgme_engine_info_t engine_info;
281
254
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
286
259
gpgme_data_t pgp_data;
575
538
safer_gnutls_strerror(ret));
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
586
buffer_capacity = incbuffer((char **)&buffer.data,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
601
/* check bytes_read for failure */
608
buffer.size += (unsigned int)bytes_read;
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
651
fprintf_plus(stderr, "Falling back to security parameter"
653
safe_string(gnutls_sec_param_get_name
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
679
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
542
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
907
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
908
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
909
744
if(af == AF_INET6){
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
920
if(ret == EAI_SYSTEM){
921
perror_plus("getnameinfo");
922
} else if(ret != 0) {
923
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
924
} else if(strcmp(addrstr, ip) != 0){
925
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);
1593
1418
if(setuid(0) == -1){
1594
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1596
1422
errno = old_errno;
1597
1423
return ret_errno;
1600
1426
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
1427
error_t lower_privileges(void){
1603
1428
error_t old_errno = errno;
1604
1429
error_t ret_errno = 0;
1605
1430
if(seteuid(uid) == -1){
1606
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1608
1434
errno = old_errno;
1609
1435
return ret_errno;
1612
1438
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
1439
error_t lower_privileges_permanently(void){
1615
1440
error_t old_errno = errno;
1616
1441
error_t ret_errno = 0;
1617
1442
if(setuid(uid) == -1){
1618
1443
ret_errno = errno;
1444
perror_plus("setuid");
1620
1446
errno = old_errno;
1621
1447
return ret_errno;
1624
__attribute__((nonnull))
1625
void run_network_hooks(const char *mode, const char *interface,
1450
bool run_network_hooks(const char *mode, const char *interface,
1626
1451
const float delay){
1627
struct dirent **direntries = NULL;
1628
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1630
if(hookdir_fd == -1){
1631
if(errno == ENOENT){
1633
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1634
" found\n", hookdir);
1637
perror_plus("open");
1643
#if __GLIBC_PREREQ(2, 15)
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1653
#endif /* not __GLIBC__ */
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1654
1457
if(numhooks == -1){
1655
perror_plus("scandir");
1658
struct dirent *direntry;
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[i];
1664
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");
1667
pid_t hook_pid = fork();
1670
/* Raise privileges */
1671
errno = raise_privileges_permanently();
1673
perror_plus("Failed to raise privileges");
1680
perror_plus("setgid");
1683
/* Reset supplementary groups */
1685
ret = setgroups(0, NULL);
1687
perror_plus("setgroups");
1690
ret = dup2(devnull, STDIN_FILENO);
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1695
ret = close(devnull);
1697
perror_plus("close");
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1707
perror_plus("setenv");
1710
ret = setenv("DEVICE", interface, 1);
1712
perror_plus("setenv");
1715
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1717
perror_plus("setenv");
1720
ret = setenv("MODE", mode, 1);
1722
perror_plus("setenv");
1726
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);
1728
1473
perror_plus("asprintf");
1731
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");
1733
1532
free(delaystring);
1734
perror_plus("setenv");
1738
if(connect_to != NULL){
1739
ret = setenv("CONNECT", connect_to, 1);
1741
perror_plus("setenv");
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1747
perror_plus("openat");
1748
_exit(EXIT_FAILURE);
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1751
perror_plus("close");
1752
_exit(EXIT_FAILURE);
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1756
perror_plus("fexecve");
1757
_exit(EXIT_FAILURE);
1761
perror_plus("fork");
1766
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
perror_plus("waitpid");
1771
if(WIFEXITED(status)){
1772
if(WEXITSTATUS(status) != 0){
1773
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1774
" with status %d\n", direntry->d_name,
1775
WEXITSTATUS(status));
1779
} else if(WIFSIGNALED(status)){
1780
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1781
" 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);
1786
fprintf_plus(stderr, "Warning: network hook \"%s\""
1787
" crashed\n", direntry->d_name);
1793
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1800
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",
1807
__attribute__((nonnull, warn_unused_result))
1808
1583
error_t bring_up_interface(const char *const interface,
1809
1584
const float delay){
1810
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1812
1589
struct ifreq network;
1813
1590
unsigned int if_index = if_nametoindex(interface);
1814
1591
if(if_index == 0){
2009
1755
int main(int argc, char *argv[]){
2010
mandos_context mc = { .server = NULL, .dh_bits = 0,
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2011
1757
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
1758
"+CTYPE-OPENPGP", .current_server = NULL };
2014
1759
AvahiSServiceBrowser *sb = NULL;
2015
1760
error_t ret_errno;
2017
1762
intmax_t tmpmax;
2019
1764
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
2020
1767
char *interfaces_to_take_down = NULL;
2021
1768
size_t interfaces_to_take_down_size = 0;
2022
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2023
char old_tempdir[] = "/tmp/mandosXXXXXX";
2024
char *tempdir = NULL;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
2025
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2026
1772
const char *seckey = PATHDIR "/" SECKEY;
2027
1773
const char *pubkey = PATHDIR "/" PUBKEY;
2028
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
2030
1777
bool gnutls_initialized = false;
2031
1778
bool gpgme_initialized = false;
2382
2129
/* If no interfaces were specified, make a list */
2383
if(mc.interfaces == NULL){
2384
struct dirent **direntries = NULL;
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2385
2132
/* Look for any good interfaces */
2386
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2389
2136
/* Add all found interfaces to interfaces list */
2390
2137
for(int i = 0; i < ret; ++i){
2391
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2392
2139
direntries[i]->d_name);
2393
2140
if(ret_errno != 0){
2395
2141
perror_plus("argz_add");
2396
free(direntries[i]);
2400
2145
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2401
2146
direntries[i]->d_name);
2403
free(direntries[i]);
2405
2149
free(direntries);
2410
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2411
2153
exitcode = EXIT_FAILURE;
2416
/* 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)){
2418
2170
char *interface = NULL;
2419
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2171
while((interface = argz_next(interfaces, interfaces_size,
2421
/* If interface name is "none", stop bringing up interfaces.
2422
Also remove all instances of "none" from the list */
2423
if(strcmp(interface, "none") == 0){
2424
argz_delete(&mc.interfaces, &mc.interfaces_size,
2427
while((interface = argz_next(mc.interfaces,
2428
mc.interfaces_size, interface))){
2429
if(strcmp(interface, "none") == 0){
2430
argz_delete(&mc.interfaces, &mc.interfaces_size,
2437
2173
bool interface_was_up = interface_is_up(interface);
2438
errno = bring_up_interface(interface, delay);
2174
ret = bring_up_interface(interface, delay);
2439
2175
if(not interface_was_up){
2441
2178
perror_plus("Failed to bring up interface");
2443
errno = argz_add(&interfaces_to_take_down,
2444
&interfaces_to_take_down_size,
2447
perror_plus("argz_add");
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2188
interfaces_size = 0;
2452
2189
if(debug and (interfaces_to_take_down == NULL)){
2453
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
2457
/* If we only got one interface, explicitly use only that one */
2458
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2460
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2463
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2676
2394
mc.current_server->prev->next = NULL;
2677
2395
while(mc.current_server != NULL){
2678
2396
server *next = mc.current_server->next;
2680
#pragma GCC diagnostic push
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
2683
free((char *)(mc.current_server->ip));
2685
#pragma GCC diagnostic pop
2687
2397
free(mc.current_server);
2688
2398
mc.current_server = next;
2692
/* Re-raise privileges */
2402
/* Re-raise priviliges */
2694
ret_errno = raise_privileges();
2697
perror_plus("Failed to raise privileges");
2700
/* Run network hooks */
2701
run_network_hooks("stop", interfaces_hooks != NULL ?
2702
interfaces_hooks : "", delay);
2704
/* Take down the network interfaces which were brought up */
2706
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2710
ret_errno = take_down_interface(interface);
2713
perror_plus("Failed to take down interface");
2716
if(debug and (interfaces_to_take_down == NULL)){
2717
fprintf_plus(stderr, "No interfaces needed to be taken"
2723
ret_errno = lower_privileges_permanently();
2726
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();
2730
2431
free(interfaces_to_take_down);
2731
2432
free(interfaces_hooks);
2733
2434
/* Removes the GPGME temp directory and all files inside */
2734
if(tempdir != NULL){
2435
if(tempdir_created){
2735
2436
struct dirent **direntries = NULL;
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2761
free(direntries[i]);
2764
/* need to clean even if 0 because man page doesn't specify */
2766
if(numentries == -1){
2767
perror_plus("scandir");
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
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,
2774
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");