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(),
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
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
194
server *new_server = malloc(sizeof(server));
195
if(new_server == NULL){
196
perror_plus("malloc");
199
*new_server = (server){ .ip = strdup(ip),
201
.if_index = if_index,
203
if(new_server->ip == NULL){
204
perror_plus("strdup");
207
/* unique case of first server */
208
if (mc.current_server == NULL){
209
new_server->next = new_server;
210
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
216
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
perror_plus("clock_gettime");
228
170
* Initialize GPGME.
706
648
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
707
649
char interface[IF_NAMESIZE];
708
650
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
perror_plus("if_indextoname");
651
perror("if_indextoname");
711
653
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
654
ip, interface, port);
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1210
if(mc.current_server == NULL){
1213
"Wait until first server is found. No timeout!\n");
1215
ret = avahi_simple_poll_iterate(s, -1);
1218
fprintf(stderr, "Check current_server if we should run it,"
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/* the current time */
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
perror_plus("clock_gettime");
1227
/* Calculating in ms how long time between now and server
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who we visted longest time ago. Now - last seen. */
1229
waited_time.tv_sec = (now.tv_sec
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- mc.current_server->last_seen.tv_sec);
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waited_time.tv_nsec = (now.tv_nsec
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- mc.current_server->last_seen.tv_nsec);
1233
/* total time is 10s/10,000ms.
1234
Converting to s from ms by dividing by 1,000,
1235
and ns to ms by dividing by 1,000,000. */
1236
block_time = ((retry_interval
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1244
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1250
avahi_simple_poll_quit(mc.simple_poll);
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1256
perror_plus("clock_gettime");
1259
mc.current_server = mc.current_server->next;
1260
block_time = 0; /* Call avahi to find new Mandos
1261
servers, but don't block */
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1267
if (ret > 0 or errno != EINTR) {
1268
return (ret != 1) ? ret : 0;
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1129
int main(int argc, char *argv[]){
1275
1130
AvahiSServiceBrowser *sb = NULL;
1293
1148
bool gnutls_initialized = false;
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1149
bool gpgme_initialized = false;
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1150
float delay = 2.5f;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
1299
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struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1300
1153
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1407
1256
if(errno != 0 or tmp == arg or *tmp != '\0'){
1408
1257
argp_error(state, "Bad delay");
1410
case 132: /* --retry */
1412
retry_interval = strtod(arg, &tmp);
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1415
argp_error(state, "Bad retry interval");
1419
1261
* These reproduce what we would get without ARGP_NO_HELP
1460
/* Work around Debian bug #633582:
1461
<http://bugs.debian.org/633582> */
1464
/* Re-raise priviliges */
1468
perror_plus("seteuid");
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1477
perror_plus("fstat");
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1482
perror_plus("fchown");
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1495
perror_plus("fstat");
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1500
perror_plus("fchown");
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1507
/* Lower privileges */
1511
perror_plus("seteuid");
1516
1302
avahi_set_log_function(empty_log);
1555
1341
sigemptyset(&sigterm_action.sa_mask);
1556
1342
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1558
perror_plus("sigaddset");
1344
perror("sigaddset");
1559
1345
exitcode = EX_OSERR;
1562
1348
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1564
perror_plus("sigaddset");
1350
perror("sigaddset");
1565
1351
exitcode = EX_OSERR;
1568
1354
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1570
perror_plus("sigaddset");
1356
perror("sigaddset");
1571
1357
exitcode = EX_OSERR;
1578
1364
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1580
perror_plus("sigaction");
1366
perror("sigaction");
1581
1367
return EX_OSERR;
1583
1369
if(old_sigterm_action.sa_handler != SIG_IGN){
1584
1370
ret = sigaction(SIGINT, &sigterm_action, NULL);
1586
perror_plus("sigaction");
1372
perror("sigaction");
1587
1373
exitcode = EX_OSERR;
1591
1377
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1593
perror_plus("sigaction");
1379
perror("sigaction");
1594
1380
return EX_OSERR;
1596
1382
if(old_sigterm_action.sa_handler != SIG_IGN){
1597
1383
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1599
perror_plus("sigaction");
1385
perror("sigaction");
1600
1386
exitcode = EX_OSERR;
1604
1390
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1606
perror_plus("sigaction");
1392
perror("sigaction");
1607
1393
return EX_OSERR;
1609
1395
if(old_sigterm_action.sa_handler != SIG_IGN){
1610
1396
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1612
perror_plus("sigaction");
1398
perror("sigaction");
1613
1399
exitcode = EX_OSERR;
1663
1449
ret = seteuid(uid);
1665
perror_plus("seteuid");
1669
1455
strcpy(network.ifr_name, interface);
1670
1456
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1672
perror_plus("ioctl SIOCGIFFLAGS");
1458
perror("ioctl SIOCGIFFLAGS");
1673
1459
#ifdef __linux__
1674
1460
if(restore_loglevel){
1675
1461
ret = klogctl(7, NULL, 0);
1677
perror_plus("klogctl");
1680
1466
#endif /* __linux__ */
1693
1479
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1695
1481
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1697
1483
exitcode = EX_OSERR;
1698
1484
#ifdef __linux__
1699
1485
if(restore_loglevel){
1700
1486
ret = klogctl(7, NULL, 0);
1702
perror_plus("klogctl");
1705
1491
#endif /* __linux__ */
1708
1494
ret = seteuid(uid);
1710
perror_plus("seteuid");
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1501
/* sleep checking until interface is running */
1717
1502
for(int i=0; i < delay * 4; i++){
1718
1503
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1720
perror_plus("ioctl SIOCGIFFLAGS");
1505
perror("ioctl SIOCGIFFLAGS");
1721
1506
} else if(network.ifr_flags & IFF_RUNNING){
1724
1509
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
1510
ret = nanosleep(&sleeptime, NULL);
1726
1511
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1512
perror("nanosleep");
1730
1515
if(not take_down_interface){
1731
1516
/* We won't need the socket anymore */
1732
1517
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
perror_plus("close");
1737
1522
#ifdef __linux__
1912
1698
fprintf(stderr, "Starting Avahi loop search\n");
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
1701
avahi_simple_poll_loop(mc.simple_poll);
1944
1725
if(gpgme_initialized){
1945
1726
gpgme_release(mc.ctx);
1948
/* Cleans up the circular linked list of Mandos servers the client
1950
if(mc.current_server != NULL){
1951
mc.current_server->prev->next = NULL;
1952
while(mc.current_server != NULL){
1953
server *next = mc.current_server->next;
1954
free(mc.current_server);
1955
mc.current_server = next;
1959
1729
/* Take down the network interface */
1960
1730
if(take_down_interface){
1963
1733
ret = seteuid(0);
1965
perror_plus("seteuid");
1967
1737
if(geteuid() == 0){
1968
1738
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
perror_plus("ioctl SIOCGIFFLAGS");
1740
perror("ioctl SIOCGIFFLAGS");
1971
1741
} else if(network.ifr_flags & IFF_UP) {
1972
1742
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
1743
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1745
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1978
1748
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1980
perror_plus("close");
1982
1752
/* Lower privileges permanently */
1984
1754
ret = setuid(uid);
1986
perror_plus("setuid");
1991
/* Removes the GPGME temp directory and all files inside */
1761
/* Removes the temp directory used by GPGME */
1992
1762
if(tempdir_created){
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1997
for(int i = 0; i < ret; i++){
1998
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'))){
1999
1783
char *fullname = NULL;
2000
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
1785
direntry->d_name);
2003
perror_plus("asprintf");
2006
1790
ret = remove(fullname);