164
191
return buffer_capacity;
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
203
*new_server = (server){ .ip = strdup(ip),
205
.if_index = if_index,
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
perror_plus("clock_gettime");
168
232
* Initialize GPGME.
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
172
236
gpgme_error_t rc;
173
237
gpgme_engine_info_t engine_info;
184
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
190
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
255
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
193
258
gpgme_strsource(rc), gpgme_strerror(rc));
197
262
rc = gpgme_op_import(mc.ctx, pgp_data);
198
263
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
200
266
gpgme_strsource(rc), gpgme_strerror(rc));
204
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
272
perror_plus("close");
208
274
gpgme_data_release(pgp_data);
213
fprintf(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
217
284
gpgme_check_version(NULL);
218
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
286
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
221
289
gpgme_strsource(rc), gpgme_strerror(rc));
225
/* Set GPGME home directory for the OpenPGP engine only */
293
/* Set GPGME home directory for the OpenPGP engine only */
226
294
rc = gpgme_get_engine_info(&engine_info);
227
295
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
229
298
gpgme_strsource(rc), gpgme_strerror(rc));
297
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
372
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
300
375
gpgme_strsource(rc), gpgme_strerror(rc));
301
376
plaintext_length = -1;
303
378
gpgme_decrypt_result_t result;
304
379
result = gpgme_op_decrypt_result(mc.ctx);
305
380
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "Unsupported algorithm: %s\n",
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
309
386
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
311
389
result->wrong_key_usage);
312
390
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
315
394
gpgme_recipient_t recipient;
316
395
recipient = result->recipients;
317
396
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
319
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
322
404
recipient->status == GPG_ERR_NO_SECKEY
324
406
recipient = recipient->next;
443
526
GNUTLS_OPENPGP_FMT_BASE64);
444
527
if(ret != GNUTLS_E_SUCCESS){
529
"Mandos plugin mandos-client: "
446
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
453
537
/* GnuTLS server initialization */
454
538
ret = gnutls_dh_params_init(&mc.dh_params);
455
539
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
457
542
" %s\n", safer_gnutls_strerror(ret));
460
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
546
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
463
549
safer_gnutls_strerror(ret));
1015
1126
signal_received = sig;
1016
1127
int old_errno = errno;
1128
/* set main loop to exit */
1017
1129
if(mc.simple_poll != NULL){
1018
1130
avahi_simple_poll_quit(mc.simple_poll);
1020
1132
errno = old_errno;
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1140
perror_plus("socket");
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
perror_plus("ioctl SIOCGIFFLAGS");
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1189
/* Accept this device */
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device.
1200
* (This function is passed to scandir(3) as a filter function.)
1202
int good_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1208
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1217
if(not good_flags(if_entry->d_name, &ifr)){
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1234
if(not get_flags(if_entry->d_name, &ifr)){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1263
if(not good_flags(if_entry->d_name, &ifr)){
1269
int notdotentries(const struct dirent *direntry){
1270
/* Skip "." and ".." */
1271
if(direntry->d_name[0] == '.'
1272
and (direntry->d_name[1] == '\0'
1273
or (direntry->d_name[1] == '.'
1274
and direntry->d_name[2] == '\0'))){
1280
/* Is this directory entry a runnable program? */
1281
int runnable_hook(const struct dirent *direntry){
1286
if((direntry->d_name)[0] == '\0'){
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
"abcdefghijklmnopqrstuvwxyz"
1295
if((direntry->d_name)[sret] != '\0'){
1296
/* Contains non-allowed characters */
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1308
perror_plus("asprintf");
1312
ret = stat(fullname, &st);
1315
perror_plus("Could not stat hook");
1319
if(not (S_ISREG(st.st_mode))){
1320
/* Not a regular file */
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
/* Not executable */
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1342
struct timespec now;
1343
struct timespec waited_time;
1344
intmax_t block_time;
1347
if(mc.current_server == NULL){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1352
ret = avahi_simple_poll_iterate(s, -1);
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1359
/* the current time */
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1362
perror_plus("clock_gettime");
1365
/* Calculating in ms how long time between now and server
1366
who we visted longest time ago. Now - last seen. */
1367
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1369
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1371
/* total time is 10s/10,000ms.
1372
Converting to s from ms by dividing by 1,000,
1373
and ns to ms by dividing by 1,000,000. */
1374
block_time = ((retry_interval
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1383
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1389
avahi_simple_poll_quit(mc.simple_poll);
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1395
perror_plus("clock_gettime");
1398
mc.current_server = mc.current_server->next;
1399
block_time = 0; /* Call avahi to find new Mandos
1400
servers, but don't block */
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1406
if (ret > 0 or errno != EINTR){
1407
return (ret != 1) ? ret : 0;
1023
1413
int main(int argc, char *argv[]){
1024
1414
AvahiSServiceBrowser *sb = NULL;
1608
/* Work around Debian bug #633582:
1609
<http://bugs.debian.org/633582> */
1612
/* Re-raise priviliges */
1616
perror_plus("seteuid");
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1626
perror_plus("fstat");
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1631
perror_plus("fchown");
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1646
perror_plus("fstat");
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1651
perror_plus("fchown");
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1659
/* Lower privileges */
1663
perror_plus("seteuid");
1667
/* Find network hooks and run them */
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1674
perror_plus("scandir");
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1682
perror_plus("asprintf");
1685
pid_t hook_pid = fork();
1688
dup2(devnull, STDIN_FILENO);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1693
perror_plus("setenv");
1696
ret = setenv("DEVICE", interface, 1);
1698
perror_plus("setenv");
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1703
perror_plus("setenv");
1706
ret = setenv("MODE", "start", 1);
1708
perror_plus("setenv");
1712
ret = asprintf(&delaystring, "%f", delay);
1714
perror_plus("asprintf");
1717
ret = setenv("DELAY", delaystring, 1);
1720
perror_plus("setenv");
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1197
1767
avahi_set_log_function(empty_log);
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1776
/* No up interfaces, look for any good interfaces */
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1788
if(interface == NULL){
1789
perror_plus("malloc");
1791
exitcode = EXIT_FAILURE;
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1200
1804
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1805
from the signal handler */
1202
1806
/* Initialize the pseudo-RNG for Avahi */
1203
1807
srand((unsigned int) time(NULL));
1204
1808
mc.simple_poll = avahi_simple_poll_new();
1205
1809
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
1207
1812
exitcode = EX_UNAVAILABLE;
1234
1839
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1236
perror("sigaction");
1841
perror_plus("sigaction");
1237
1842
return EX_OSERR;
1239
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
1845
ret = sigaction(SIGINT, &sigterm_action, NULL);
1242
perror("sigaction");
1847
perror_plus("sigaction");
1243
1848
exitcode = EX_OSERR;
1247
1852
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1249
perror("sigaction");
1854
perror_plus("sigaction");
1250
1855
return EX_OSERR;
1252
1857
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
1858
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1255
perror("sigaction");
1860
perror_plus("sigaction");
1256
1861
exitcode = EX_OSERR;
1260
1865
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1262
perror("sigaction");
1867
perror_plus("sigaction");
1263
1868
return EX_OSERR;
1265
1870
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
1871
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1268
perror("sigaction");
1873
perror_plus("sigaction");
1269
1874
exitcode = EX_OSERR;
1274
1879
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1880
if(strcmp(interface, "none") != 0){
1276
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
1882
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1279
1885
exitcode = EX_UNAVAILABLE;
1615
2246
ret = seteuid(0);
2248
perror_plus("seteuid");
1619
2250
if(geteuid() == 0){
1620
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
1624
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
perror("ioctl SIOCSIFFLAGS");
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1630
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2263
perror_plus("close");
1634
2265
/* Lower privileges permanently */
1636
2267
ret = setuid(uid);
2269
perror_plus("setuid");
1643
/* Removes the temp directory used by GPGME */
2274
/* Removes the GPGME temp directory and all files inside */
1644
2275
if(tempdir_created){
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1649
if(errno != ENOENT){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
2276
struct dirent **direntries = NULL;
2277
struct dirent *direntry = NULL;
2278
int numentries = scandir(tempdir, &direntries, notdotentries,
2280
if (numentries > 0){
2281
for(int i = 0; i < numentries; i++){
2282
direntry = direntries[i];
1665
2283
char *fullname = NULL;
1666
2284
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2285
direntry->d_name);
2287
perror_plus("asprintf");
1672
2290
ret = remove(fullname);
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1677
2295
free(fullname);
2299
/* need to clean even if 0 because man page doesn't specify */
2301
if (numentries == -1){
2302
perror_plus("scandir");
1681
2304
ret = rmdir(tempdir);
1682
2305
if(ret == -1 and errno != ENOENT){
2306
perror_plus("rmdir");