227
224
/* Special case of first server */
228
if(*current_server == NULL){
225
if (mc.current_server == NULL){
229
226
new_server->next = new_server;
230
227
new_server->prev = new_server;
231
*current_server = new_server;
228
mc.current_server = new_server;
232
229
/* Place the new server last in the list */
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
236
233
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
238
perror_plus("clock_gettime");
378
375
/* Decrypt data from the cryptotext data buffer to the plaintext
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
378
if(rc != GPG_ERR_NO_ERROR){
382
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
380
gpgme_strsource(rc), gpgme_strerror(rc));
384
381
plaintext_length = -1;
386
383
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
388
385
if(result == NULL){
389
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
535
532
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
537
534
if(ret != GNUTLS_E_SUCCESS){
538
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
536
" initialization: %s\n",
540
537
safer_gnutls_strerror(ret));
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
541
if(ret != GNUTLS_E_SUCCESS){
545
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
543
safer_gnutls_strerror(ret));
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
556
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
557
554
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
562
static int init_gnutls_session(gnutls_session_t *session,
559
static int init_gnutls_session(gnutls_session_t *session){
565
561
/* GnuTLS session creation */
733
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
734
733
perror_plus("if_indextoname");
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
743
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1035
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1036
1032
host_name, ip, (intmax_t)interface, port);
1038
int ret = start_mandos_communication(ip, (in_port_t)port,
1040
avahi_proto_to_af(proto),
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1043
avahi_simple_poll_quit(simple_poll);
1037
avahi_simple_poll_quit(mc.simple_poll);
1045
if(not add_server(ip, (in_port_t)port, interface,
1046
avahi_proto_to_af(proto),
1047
&((mandos_context*)mc)->current_server)){
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1048
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1049
1042
" list\n", name);
1091
1081
the callback function is called the Avahi server will free the
1092
1082
resolver for us. */
1094
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1095
interface, protocol, name, type,
1096
domain, protocol, 0,
1097
resolve_callback, mc) == NULL)
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1098
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1100
avahi_strerror(avahi_server_errno
1101
(((mandos_context*)mc)->server)));
1089
avahi_strerror(avahi_server_errno(mc.server)));
1104
1092
case AVAHI_BROWSER_REMOVE:
1224
* This function determines if a network interface is up.
1226
bool interface_is_up(const char *interface){
1228
if(not get_flags(interface, &ifr)){
1230
fprintf_plus(stderr, "Failed to get flags for interface "
1231
"\"%s\"\n", interface);
1236
return (bool)(ifr.ifr_flags & IFF_UP);
1240
* This function determines if a network interface is running
1242
bool interface_is_running(const char *interface){
1244
if(not get_flags(interface, &ifr)){
1246
fprintf_plus(stderr, "Failed to get flags for interface "
1247
"\"%s\"\n", interface);
1252
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1217
if(not get_flags(if_entry->d_name, &ifr)){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1243
if(not good_flags(if_entry->d_name, &ifr)){
1255
1249
int notdotentries(const struct dirent *direntry){
1370
1363
if(block_time <= 0){
1371
ret = start_mandos_communication(mc->current_server->ip,
1372
mc->current_server->port,
1373
mc->current_server->if_index,
1374
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1376
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1379
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1380
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1382
1375
perror_plus("clock_gettime");
1385
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1386
1379
block_time = 0; /* Call avahi to find new Mandos
1387
1380
servers, but don't block */
1400
/* Set effective uid to 0, return errno */
1401
error_t raise_privileges(void){
1402
error_t old_errno = errno;
1403
error_t ret_errno = 0;
1404
if(seteuid(0) == -1){
1406
perror_plus("seteuid");
1412
/* Set effective and real user ID to 0. Return errno. */
1413
error_t raise_privileges_permanently(void){
1414
error_t old_errno = errno;
1415
error_t ret_errno = raise_privileges();
1420
if(setuid(0) == -1){
1422
perror_plus("seteuid");
1428
/* Set effective user ID to unprivileged saved user ID */
1429
error_t lower_privileges(void){
1430
error_t old_errno = errno;
1431
error_t ret_errno = 0;
1432
if(seteuid(uid) == -1){
1434
perror_plus("seteuid");
1440
/* Lower privileges permanently */
1441
error_t lower_privileges_permanently(void){
1442
error_t old_errno = errno;
1443
error_t ret_errno = 0;
1444
if(setuid(uid) == -1){
1446
perror_plus("setuid");
1452
1393
bool run_network_hooks(const char *mode, const char *interface,
1453
1394
const float delay){
1454
1395
struct dirent **direntries;
1585
error_t bring_up_interface(const char *const interface,
1588
error_t old_errno = errno;
1589
error_t ret_errno = 0;
1590
int ret, ret_setflags;
1591
struct ifreq network;
1592
unsigned int if_index = if_nametoindex(interface);
1594
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1604
if(not interface_is_up(interface)){
1605
if(not get_flags(interface, &network) and debug){
1607
fprintf_plus(stderr, "Failed to get flags for interface "
1608
"\"%s\"\n", interface);
1611
network.ifr_flags |= IFF_UP;
1613
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1616
perror_plus("socket");
1628
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1632
/* Raise priviliges */
1636
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1637
messages about the network interface to mess up the prompt */
1638
int ret_linux = klogctl(8, NULL, 5);
1639
bool restore_loglevel = true;
1640
if(ret_linux == -1){
1641
restore_loglevel = false;
1642
perror_plus("klogctl");
1644
#endif /* __linux__ */
1645
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1648
if(restore_loglevel){
1649
ret_linux = klogctl(7, NULL, 0);
1650
if(ret_linux == -1){
1651
perror_plus("klogctl");
1654
#endif /* __linux__ */
1656
/* Lower privileges */
1659
/* Close the socket */
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1662
perror_plus("close");
1665
if(ret_setflags == -1){
1667
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1672
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1676
/* Sleep checking until interface is running.
1677
Check every 0.25s, up to total time of delay */
1678
for(int i=0; i < delay * 4; i++){
1679
if(interface_is_running(interface)){
1682
struct timespec sleeptime = { .tv_nsec = 250000000 };
1683
ret = nanosleep(&sleeptime, NULL);
1684
if(ret == -1 and errno != EINTR){
1685
perror_plus("nanosleep");
1693
error_t take_down_interface(const char *const interface){
1695
error_t old_errno = errno;
1696
error_t ret_errno = 0;
1697
int ret, ret_setflags;
1698
struct ifreq network;
1699
unsigned int if_index = if_nametoindex(interface);
1701
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1705
if(interface_is_up(interface)){
1706
if(not get_flags(interface, &network) and debug){
1708
fprintf_plus(stderr, "Failed to get flags for interface "
1709
"\"%s\"\n", interface);
1712
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1714
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1717
perror_plus("socket");
1723
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1727
/* Raise priviliges */
1730
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1733
/* Lower privileges */
1736
/* Close the socket */
1737
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
perror_plus("close");
1742
if(ret_setflags == -1){
1744
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1749
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1757
1529
int main(int argc, char *argv[]){
1758
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1759
.priority = "SECURE256:!CTYPE-X.509:"
1760
"+CTYPE-OPENPGP", .current_server = NULL,
1761
.interfaces = NULL, .interfaces_size = 0 };
1762
1530
AvahiSServiceBrowser *sb = NULL;
1765
1533
intmax_t tmpmax;
1767
1535
int exitcode = EXIT_SUCCESS;
1768
char *interfaces_to_take_down = NULL;
1769
size_t interfaces_to_take_down_size = 0;
1536
const char *interface = "";
1537
struct ifreq network;
1539
bool take_down_interface = false;
1770
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1771
1543
bool tempdir_created = false;
1772
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1773
1545
const char *seckey = PATHDIR "/" SECKEY;
1774
1546
const char *pubkey = PATHDIR "/" PUBKEY;
1775
char *interfaces_hooks = NULL;
1776
size_t interfaces_hooks_size = 0;
1778
1548
bool gnutls_initialized = false;
1779
1549
bool gpgme_initialized = false;
2015
/* Remove empty interface names */
2017
char *interface = NULL;
2018
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2020
if(if_nametoindex(interface) == 0){
2021
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2022
fprintf_plus(stderr, "Not using nonexisting interface"
2023
" \"%s\"\n", interface);
2025
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2031
1785
/* Run network hooks */
2034
if(mc.interfaces != NULL){
2035
interfaces_hooks = malloc(mc.interfaces_size);
2036
if(interfaces_hooks == NULL){
2037
perror_plus("malloc");
2040
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2041
interfaces_hooks_size = mc.interfaces_size;
2042
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2045
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2046
interfaces_hooks : "", delay)){
1786
if(not run_network_hooks("start", interface, delay)){
2052
1791
avahi_set_log_function(empty_log);
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1800
/* No up interfaces, look for any good interfaces */
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1811
if(interface == NULL){
1812
perror_plus("malloc");
1814
exitcode = EXIT_FAILURE;
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
2055
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2056
1827
from the signal handler */
2057
1828
/* Initialize the pseudo-RNG for Avahi */
2058
1829
srand((unsigned int) time(NULL));
2059
simple_poll = avahi_simple_poll_new();
2060
if(simple_poll == NULL){
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2061
1832
fprintf_plus(stderr,
2062
1833
"Avahi: Failed to create simple poll object.\n");
2063
1834
exitcode = EX_UNAVAILABLE;
2130
/* If no interfaces were specified, make a list */
2131
if(mc.interfaces == NULL){
2132
struct dirent **direntries;
2133
/* Look for any good interfaces */
2134
ret = scandir(sys_class_net, &direntries, good_interface,
2137
/* Add all found interfaces to interfaces list */
2138
for(int i = 0; i < ret; ++i){
2139
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2140
direntries[i]->d_name);
2142
perror_plus("argz_add");
2146
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2147
direntries[i]->d_name);
2153
fprintf_plus(stderr, "Could not find a network interface\n");
2154
exitcode = EXIT_FAILURE;
2159
/* If we only got one interface, explicitly use only that one */
2160
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2162
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2165
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2168
/* Bring up interfaces which are down */
2169
if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1
2170
and strcmp(mc.interfaces, "none") == 0)){
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2174
bool interface_was_up = interface_is_up(interface);
2175
ret = bring_up_interface(interface, delay);
2176
if(not interface_was_up){
2179
perror_plus("Failed to bring up interface");
2181
ret_errno = argz_add(&interfaces_to_take_down,
2182
&interfaces_to_take_down_size,
2187
free(mc.interfaces);
2188
mc.interfaces = NULL;
2189
mc.interfaces_size = 0;
2190
if(debug and (interfaces_to_take_down == NULL)){
2191
fprintf_plus(stderr, "No interfaces were brought up\n");
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1914
/* Re-raise priviliges */
1918
perror_plus("seteuid");
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1930
#endif /* __linux__ */
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1940
perror_plus("klogctl");
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1948
perror_plus("seteuid");
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1955
perror_plus("ioctl SIOCGIFFLAGS");
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1960
perror_plus("klogctl");
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1969
perror_plus("seteuid");
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1985
perror_plus("klogctl");
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1993
perror_plus("seteuid");
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2017
perror_plus("close");
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2025
perror_plus("klogctl");
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2031
/* Lower privileges */
2034
perror_plus("seteuid");
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2403
2247
/* Re-raise priviliges */
2407
/* Run network hooks */
2408
run_network_hooks("stop", interfaces_hooks != NULL ?
2409
interfaces_hooks : "", delay);
2411
/* Take down the network interfaces which were brought up */
2413
char *interface = NULL;
2414
while((interface=argz_next(interfaces_to_take_down,
2415
interfaces_to_take_down_size,
2417
ret_errno = take_down_interface(interface);
2420
perror_plus("Failed to take down interface");
2252
perror_plus("seteuid");
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2423
if(debug and (interfaces_to_take_down == NULL)){
2424
fprintf_plus(stderr, "No interfaces needed to be taken"
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
perror_plus("close");
2429
lower_privileges_permanently();
2432
free(interfaces_to_take_down);
2433
free(interfaces_hooks);
2273
/* Lower privileges permanently */
2277
perror_plus("setuid");
2435
2280
/* Removes the GPGME temp directory and all files inside */
2436
2281
if(tempdir_created){