62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
127
126
bool debug = false;
128
127
static const char mandos_protocol_version[] = "1";
129
128
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
130
static const char sys_class_net[] = "/sys/class/net";
132
131
char *connect_to = NULL;
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
138
AvahiIfIndex if_index;
140
struct timespec last_seen;
145
133
/* Used for passing in values through the Avahi callback functions */
147
135
AvahiSimplePoll *simple_poll;
151
139
gnutls_dh_params_t dh_params;
152
140
const char *priority;
154
server *current_server;
155
142
} mandos_context;
157
144
/* global context so signal handler can reach it*/
158
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
146
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
163
149
sig_atomic_t quit_now = 0;
164
150
int signal_received = 0;
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
174
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
154
* bytes. "buffer_capacity" is how much is currently allocated,
187
166
return buffer_capacity;
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
200
*new_server = (server){ .ip = strdup(ip),
202
.if_index = if_index,
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
perror_plus("clock_gettime");
229
170
* Initialize GPGME.
707
648
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
649
char interface[IF_NAMESIZE];
709
650
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
651
perror("if_indextoname");
712
653
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
654
ip, interface, port);
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1211
if(mc.current_server == NULL){
1214
"Wait until first server is found. No timeout!\n");
1216
ret = avahi_simple_poll_iterate(s, -1);
1219
fprintf(stderr, "Check current_server if we should run it,"
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1225
perror_plus("clock_gettime");
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1232
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1234
/* total time is 10s/10,000ms.
1235
Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1251
avahi_simple_poll_quit(mc.simple_poll);
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1257
perror_plus("clock_gettime");
1260
mc.current_server = mc.current_server->next;
1261
block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
1275
1129
int main(int argc, char *argv[]){
1276
1130
AvahiSServiceBrowser *sb = NULL;
1294
1148
bool gnutls_initialized = false;
1295
1149
bool gpgme_initialized = false;
1296
1150
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1300
1152
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1301
1153
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1408
1256
if(errno != 0 or tmp == arg or *tmp != '\0'){
1409
1257
argp_error(state, "Bad delay");
1411
case 132: /* --retry */
1413
retry_interval = strtod(arg, &tmp);
1414
if(errno != 0 or tmp == arg or *tmp != '\0'
1415
or (retry_interval * 1000) > INT_MAX
1416
or retry_interval < 0){
1417
argp_error(state, "Bad retry interval");
1421
1261
* These reproduce what we would get without ARGP_NO_HELP
1462
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1466
/* Re-raise priviliges */
1470
perror_plus("seteuid");
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1480
perror_plus("fstat");
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1485
perror_plus("fchown");
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1500
perror_plus("fstat");
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1505
perror_plus("fchown");
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1513
/* Lower privileges */
1517
perror_plus("seteuid");
1522
1302
avahi_set_log_function(empty_log);
1561
1341
sigemptyset(&sigterm_action.sa_mask);
1562
1342
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1564
perror_plus("sigaddset");
1344
perror("sigaddset");
1565
1345
exitcode = EX_OSERR;
1568
1348
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1570
perror_plus("sigaddset");
1350
perror("sigaddset");
1571
1351
exitcode = EX_OSERR;
1574
1354
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1576
perror_plus("sigaddset");
1356
perror("sigaddset");
1577
1357
exitcode = EX_OSERR;
1584
1364
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1586
perror_plus("sigaction");
1366
perror("sigaction");
1587
1367
return EX_OSERR;
1589
1369
if(old_sigterm_action.sa_handler != SIG_IGN){
1590
1370
ret = sigaction(SIGINT, &sigterm_action, NULL);
1592
perror_plus("sigaction");
1372
perror("sigaction");
1593
1373
exitcode = EX_OSERR;
1597
1377
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1599
perror_plus("sigaction");
1379
perror("sigaction");
1600
1380
return EX_OSERR;
1602
1382
if(old_sigterm_action.sa_handler != SIG_IGN){
1603
1383
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1605
perror_plus("sigaction");
1385
perror("sigaction");
1606
1386
exitcode = EX_OSERR;
1610
1390
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1612
perror_plus("sigaction");
1392
perror("sigaction");
1613
1393
return EX_OSERR;
1615
1395
if(old_sigterm_action.sa_handler != SIG_IGN){
1616
1396
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1618
perror_plus("sigaction");
1398
perror("sigaction");
1619
1399
exitcode = EX_OSERR;
1669
1449
ret = seteuid(uid);
1671
perror_plus("seteuid");
1675
1455
strcpy(network.ifr_name, interface);
1676
1456
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1678
perror_plus("ioctl SIOCGIFFLAGS");
1458
perror("ioctl SIOCGIFFLAGS");
1679
1459
#ifdef __linux__
1680
1460
if(restore_loglevel){
1681
1461
ret = klogctl(7, NULL, 0);
1683
perror_plus("klogctl");
1686
1466
#endif /* __linux__ */
1699
1479
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1701
1481
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1703
1483
exitcode = EX_OSERR;
1704
1484
#ifdef __linux__
1705
1485
if(restore_loglevel){
1706
1486
ret = klogctl(7, NULL, 0);
1708
perror_plus("klogctl");
1711
1491
#endif /* __linux__ */
1714
1494
ret = seteuid(uid);
1716
perror_plus("seteuid");
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1501
/* sleep checking until interface is running */
1723
1502
for(int i=0; i < delay * 4; i++){
1724
1503
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1726
perror_plus("ioctl SIOCGIFFLAGS");
1505
perror("ioctl SIOCGIFFLAGS");
1727
1506
} else if(network.ifr_flags & IFF_RUNNING){
1730
1509
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
1510
ret = nanosleep(&sleeptime, NULL);
1732
1511
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1512
perror("nanosleep");
1736
1515
if(not take_down_interface){
1737
1516
/* We won't need the socket anymore */
1738
1517
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1740
perror_plus("close");
1743
1522
#ifdef __linux__
1836
1616
port = (uint16_t)tmpmax;
1837
1617
*address = '\0';
1618
address = connect_to;
1838
1619
/* Colon in address indicates IPv6 */
1840
if(strchr(connect_to, ':') != NULL){
1621
if(strchr(address, ':') != NULL){
1842
/* Accept [] around IPv6 address - see RFC 5952 */
1843
if(connect_to[0] == '[' and address[-1] == ']')
1851
address = connect_to;
1857
1631
while(not quit_now){
1858
1632
ret = start_mandos_communication(address, port, if_index, af);
1859
1633
if(quit_now or ret == 0){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
1866
sleep((int)retry_interval);
1869
1639
if (not quit_now){
1870
1640
exitcode = EXIT_SUCCESS;
1928
1698
fprintf(stderr, "Starting Avahi loop search\n");
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
1701
avahi_simple_poll_loop(mc.simple_poll);
1960
1725
if(gpgme_initialized){
1961
1726
gpgme_release(mc.ctx);
1964
/* Cleans up the circular linked list of Mandos servers the client
1966
if(mc.current_server != NULL){
1967
mc.current_server->prev->next = NULL;
1968
while(mc.current_server != NULL){
1969
server *next = mc.current_server->next;
1970
free(mc.current_server);
1971
mc.current_server = next;
1975
1729
/* Take down the network interface */
1976
1730
if(take_down_interface){
1979
1733
ret = seteuid(0);
1981
perror_plus("seteuid");
1983
1737
if(geteuid() == 0){
1984
1738
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
perror_plus("ioctl SIOCGIFFLAGS");
1740
perror("ioctl SIOCGIFFLAGS");
1987
1741
} else if(network.ifr_flags & IFF_UP) {
1988
1742
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
1743
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1745
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1994
1748
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1996
perror_plus("close");
1998
1752
/* Lower privileges permanently */
2000
1754
ret = setuid(uid);
2002
perror_plus("setuid");
2007
/* Removes the GPGME temp directory and all files inside */
1761
/* Removes the temp directory used by GPGME */
2008
1762
if(tempdir_created){
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
1764
struct dirent *direntry;
1765
d = opendir(tempdir);
1767
if(errno != ENOENT){
1772
direntry = readdir(d);
1773
if(direntry == NULL){
1776
/* Skip "." and ".." */
1777
if(direntry->d_name[0] == '.'
1778
and (direntry->d_name[1] == '\0'
1779
or (direntry->d_name[1] == '.'
1780
and direntry->d_name[2] == '\0'))){
2016
1783
char *fullname = NULL;
2017
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
1785
direntry->d_name);
2020
perror_plus("asprintf");
2023
1790
ret = remove(fullname);