183
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
189
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
268
if(rc != GPG_ERR_NO_ERROR){
191
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
192
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
196
274
rc = gpgme_op_import(mc.ctx, pgp_data);
197
275
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
203
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
283
perror_plus("close");
207
285
gpgme_data_release(pgp_data);
212
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
216
294
gpgme_check_version(NULL);
217
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
296
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
224
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
225
303
rc = gpgme_get_engine_info(&engine_info);
226
304
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
231
309
while(engine_info != NULL){
296
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
297
378
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
300
381
plaintext_length = -1;
302
383
gpgme_decrypt_result_t result;
303
384
result = gpgme_op_decrypt_result(mc.ctx);
304
385
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
311
392
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
395
gpgme_recipient_t recipient;
315
396
recipient = result->recipients;
316
397
while(recipient != NULL){
317
fprintf(stderr, "Public key algorithm: %s\n",
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
319
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
320
fprintf(stderr, "Secret key available: %s\n",
321
recipient->status == GPG_ERR_NO_SECKEY
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
323
405
recipient = recipient->next;
422
504
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
506
if(ret != GNUTLS_E_SUCCESS){
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
430
509
gnutls_global_deinit();
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
440
520
ret = gnutls_certificate_set_openpgp_key_file
441
521
(mc.cred, pubkeyfilename, seckeyfilename,
442
522
GNUTLS_OPENPGP_FMT_BASE64);
443
523
if(ret != GNUTLS_E_SUCCESS){
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
452
532
/* GnuTLS server initialization */
453
533
ret = gnutls_dh_params_init(&mc.dh_params);
454
534
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
459
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
541
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
970
1111
signal_received = sig;
971
1112
int old_errno = errno;
1113
/* set main loop to exit */
972
1114
if(mc.simple_poll != NULL){
973
1115
avahi_simple_poll_quit(mc.simple_poll);
975
1117
errno = old_errno;
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1125
perror_plus("socket");
1128
strcpy(ifr->ifr_name, ifname);
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
perror_plus("ioctl SIOCGIFFLAGS");
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1141
/* Reject the loopback device */
1142
if(ifr->ifr_flags & IFF_LOOPBACK){
1144
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1149
/* Accept point-to-point devices only if connect_to is specified */
1150
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1152
fprintf_plus(stderr, "Accepting point-to-point interface"
1153
" \"%s\"\n", ifname);
1157
/* Otherwise, reject non-broadcast-capable devices */
1158
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1160
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1161
" \"%s\"\n", ifname);
1165
/* Reject non-ARP interfaces (including dummy interfaces) */
1166
if(ifr->ifr_flags & IFF_NOARP){
1168
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1174
/* Accept this device */
1176
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1182
* This function determines if a directory entry in /sys/class/net
1183
* corresponds to an acceptable network device.
1184
* (This function is passed to scandir(3) as a filter function.)
1186
int good_interface(const struct dirent *if_entry){
1187
if(if_entry->d_name[0] == '.'){
1192
if(not get_flags(if_entry->d_name, &ifr)){
1194
fprintf_plus(stderr, "Failed to get flags for interface "
1195
"\"%s\"\n", if_entry->d_name);
1200
if(not good_flags(if_entry->d_name, &ifr)){
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)){
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1266
if((direntry->d_name)[0] == '\0'){
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1287
perror_plus("asprintf");
1291
ret = stat(fullname, &st);
1294
perror_plus("Could not stat hook");
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1328
if(mc.current_server == NULL){
1330
fprintf_plus(stderr, "Wait until first server is found."
1333
ret = avahi_simple_poll_iterate(s, -1);
1336
fprintf_plus(stderr, "Check current_server if we should run"
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1342
perror_plus("clock_gettime");
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1363
if(block_time <= 0){
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);
1369
avahi_simple_poll_quit(mc.simple_poll);
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1375
perror_plus("clock_gettime");
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1393
bool run_network_hooks(const char *mode, const char *interface,
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1401
perror_plus("scandir");
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1409
perror_plus("asprintf");
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1416
pid_t hook_pid = fork();
1419
/* Raise privileges */
1423
perror_plus("seteuid");
1425
/* Raise privileges even more */
1429
perror_plus("setuid");
1435
perror_plus("setgid");
1437
/* Reset supplementary groups */
1439
ret = setgroups(0, NULL);
1441
perror_plus("setgroups");
1443
dup2(devnull, STDIN_FILENO);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1448
perror_plus("setenv");
1451
ret = setenv("DEVICE", interface, 1);
1453
perror_plus("setenv");
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1458
perror_plus("setenv");
1461
ret = setenv("MODE", mode, 1);
1463
perror_plus("setenv");
1467
ret = asprintf(&delaystring, "%f", delay);
1469
perror_plus("asprintf");
1472
ret = setenv("DELAY", delaystring, 1);
1475
perror_plus("setenv");
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1482
perror_plus("setenv");
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
978
1529
int main(int argc, char *argv[]){
979
1530
AvahiSServiceBrowser *sb = NULL;
1723
/* Work around Debian bug #633582:
1724
<http://bugs.debian.org/633582> */
1726
/* Re-raise priviliges */
1730
perror_plus("seteuid");
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1735
int seckey_fd = open(seckey, O_RDONLY);
1736
if(seckey_fd == -1){
1737
perror_plus("open");
1739
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1741
perror_plus("fstat");
1743
if(S_ISREG(st.st_mode)
1744
and st.st_uid == 0 and st.st_gid == 0){
1745
ret = fchown(seckey_fd, uid, gid);
1747
perror_plus("fchown");
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
int pubkey_fd = open(pubkey, O_RDONLY);
1757
if(pubkey_fd == -1){
1758
perror_plus("open");
1760
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1762
perror_plus("fstat");
1764
if(S_ISREG(st.st_mode)
1765
and st.st_uid == 0 and st.st_gid == 0){
1766
ret = fchown(pubkey_fd, uid, gid);
1768
perror_plus("fchown");
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1776
/* Lower privileges */
1780
perror_plus("seteuid");
1785
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1152
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;
1155
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
1827
from the signal handler */
1157
1828
/* Initialize the pseudo-RNG for Avahi */
1158
1829
srand((unsigned int) time(NULL));
1159
1830
mc.simple_poll = avahi_simple_poll_new();
1160
1831
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1832
fprintf_plus(stderr,
1833
"Avahi: Failed to create simple poll object.\n");
1834
exitcode = EX_UNAVAILABLE;
1166
1838
sigemptyset(&sigterm_action.sa_mask);
1167
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1173
1845
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1847
perror_plus("sigaddset");
1848
exitcode = EX_OSERR;
1179
1851
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1853
perror_plus("sigaddset");
1854
exitcode = EX_OSERR;
1185
1857
/* Need to check if the handler is SIG_IGN before handling:
1545
2230
gpgme_release(mc.ctx);
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
2233
/* Cleans up the circular linked list of Mandos servers the client
2235
if(mc.current_server != NULL){
2236
mc.current_server->prev->next = NULL;
2237
while(mc.current_server != NULL){
2238
server *next = mc.current_server->next;
2239
free(mc.current_server);
2240
mc.current_server = next;
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2247
/* Re-raise priviliges */
1552
2250
ret = seteuid(0);
2252
perror_plus("seteuid");
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
1557
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
1561
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1564
perror("ioctl SIOCSIFFLAGS");
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1567
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1571
/* Lower privileges permanently */
2269
perror_plus("close");
2273
/* Lower privileges permanently */
2277
perror_plus("setuid");
1580
/* Removes the temp directory used by GPGME */
2280
/* Removes the GPGME temp directory and all files inside */
1581
2281
if(tempdir_created){
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1586
if(errno != ENOENT){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
2282
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
1602
2289
char *fullname = NULL;
1603
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
2291
direntry->d_name);
2293
perror_plus("asprintf");
1609
2296
ret = remove(fullname);
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1614
2301
free(fullname);
2305
/* need to clean even if 0 because man page doesn't specify */
2307
if (numentries == -1){
2308
perror_plus("scandir");
1618
2310
ret = rmdir(tempdir);
1619
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");