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
1127
signal_received = sig;
1016
1128
int old_errno = errno;
1129
/* set main loop to exit */
1017
1130
if(mc.simple_poll != NULL){
1018
1131
avahi_simple_poll_quit(mc.simple_poll);
1020
1133
errno = old_errno;
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
perror_plus("socket");
1144
strcpy(ifr->ifr_name, ifname);
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1148
perror_plus("ioctl SIOCGIFFLAGS");
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1165
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1173
/* Otherwise, reject non-broadcast-capable devices */
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
if(ifr->ifr_flags & IFF_NOARP){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1190
/* Accept this device */
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1199
* This function determines if a directory entry in /sys/class/net
1200
* corresponds to an acceptable network device.
1201
* (This function is passed to scandir(3) as a filter function.)
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1209
if(not get_flags(if_entry->d_name, &ifr)){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1218
if(not good_flags(if_entry->d_name, &ifr)){
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1235
if(not get_flags(if_entry->d_name, &ifr)){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1264
if(not good_flags(if_entry->d_name, &ifr)){
1270
int notdotentries(const struct dirent *direntry){
1271
/* Skip "." and ".." */
1272
if(direntry->d_name[0] == '.'
1273
and (direntry->d_name[1] == '\0'
1274
or (direntry->d_name[1] == '.'
1275
and direntry->d_name[2] == '\0'))){
1281
/* Is this directory entry a runnable program? */
1282
int runnable_hook(const struct dirent *direntry){
1286
if((direntry->d_name)[0] == '\0'){
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1299
if(((direntry->d_name)[0] == '#')
1301
/* Temporary #name# */
1305
/* XXX more rules here */
1307
ret = stat(direntry->d_name, &st);
1310
perror_plus("Could not stat plugin");
1314
if(not (S_ISREG(st.st_mode))){
1315
/* Not a regular file */
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
/* Not executable */
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1327
struct timespec now;
1328
struct timespec waited_time;
1329
intmax_t block_time;
1332
if(mc.current_server == NULL){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1337
ret = avahi_simple_poll_iterate(s, -1);
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1347
perror_plus("clock_gettime");
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc.current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc.current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc.current_server->ip,
1370
mc.current_server->port,
1371
mc.current_server->if_index,
1372
mc.current_server->af);
1374
avahi_simple_poll_quit(mc.simple_poll);
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc.current_server->last_seen);
1380
perror_plus("clock_gettime");
1383
mc.current_server = mc.current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1023
1398
int main(int argc, char *argv[]){
1024
1399
AvahiSServiceBrowser *sb = NULL;
1586
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1590
/* Re-raise priviliges */
1594
perror_plus("seteuid");
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1604
perror_plus("fstat");
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1609
perror_plus("fchown");
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1624
perror_plus("fstat");
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1629
perror_plus("fchown");
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1637
/* Lower privileges */
1641
perror_plus("seteuid");
1645
/* Find network hooks and run them */
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1652
perror_plus("scandir");
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1661
perror_plus("asprintf");
1664
pid_t hook_pid = fork();
1667
dup2(devnull, STDIN_FILENO);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1672
perror_plus("setenv");
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1677
perror_plus("setenv");
1680
ret = setenv("MODE", "start", 1);
1682
perror_plus("setenv");
1686
ret = asprintf(&delaystring, "%f", delay);
1688
perror_plus("asprintf");
1691
ret = setenv("DELAY", delaystring, 1);
1694
perror_plus("setenv");
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1197
1741
avahi_set_log_function(empty_log);
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1750
/* No up interfaces, look for any good interfaces */
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1762
if(interface == NULL){
1763
perror_plus("malloc");
1765
exitcode = EXIT_FAILURE;
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1773
exitcode = EXIT_FAILURE;
1200
1778
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1779
from the signal handler */
1202
1780
/* Initialize the pseudo-RNG for Avahi */
1203
1781
srand((unsigned int) time(NULL));
1204
1782
mc.simple_poll = avahi_simple_poll_new();
1205
1783
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1207
1786
exitcode = EX_UNAVAILABLE;
1234
1813
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1236
perror("sigaction");
1815
perror_plus("sigaction");
1237
1816
return EX_OSERR;
1239
1818
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
1819
ret = sigaction(SIGINT, &sigterm_action, NULL);
1242
perror("sigaction");
1821
perror_plus("sigaction");
1243
1822
exitcode = EX_OSERR;
1247
1826
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1249
perror("sigaction");
1828
perror_plus("sigaction");
1250
1829
return EX_OSERR;
1252
1831
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
1832
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1255
perror("sigaction");
1834
perror_plus("sigaction");
1256
1835
exitcode = EX_OSERR;
1260
1839
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1262
perror("sigaction");
1841
perror_plus("sigaction");
1263
1842
return EX_OSERR;
1265
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
1845
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1268
perror("sigaction");
1847
perror_plus("sigaction");
1269
1848
exitcode = EX_OSERR;
1274
1853
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1854
if(strcmp(interface, "none") != 0){
1276
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
1856
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1279
1859
exitcode = EX_UNAVAILABLE;
1615
2220
ret = seteuid(0);
2222
perror_plus("seteuid");
1619
2224
if(geteuid() == 0){
1620
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
1624
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
perror("ioctl SIOCSIFFLAGS");
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1630
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2237
perror_plus("close");
1634
2239
/* Lower privileges permanently */
1636
2241
ret = setuid(uid);
2243
perror_plus("setuid");
1643
/* Removes the temp directory used by GPGME */
2248
/* Removes the GPGME temp directory and all files inside */
1644
2249
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'))){
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
direntry = direntries[i];
1665
2257
char *fullname = NULL;
1666
2258
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2259
direntry->d_name);
2261
perror_plus("asprintf");
1672
2264
ret = remove(fullname);
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1677
2269
free(fullname);
2273
/* need to clean even if 0 because man page doesn't specify */
2275
if (numentries == -1){
2276
perror_plus("scandir");
1681
2278
ret = rmdir(tempdir);
1682
2279
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");