184
258
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
190
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
265
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
197
271
rc = gpgme_op_import(mc.ctx, pgp_data);
198
272
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
204
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
perror_plus("close");
208
282
gpgme_data_release(pgp_data);
213
fprintf(stderr, "Initializing GPGME\n");
287
fprintf_plus(stderr, "Initializing GPGME\n");
217
291
gpgme_check_version(NULL);
218
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
293
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
225
/* Set GPGME home directory for the OpenPGP engine only */
299
/* Set GPGME home directory for the OpenPGP engine only */
226
300
rc = gpgme_get_engine_info(&engine_info);
227
301
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
232
306
while(engine_info != NULL){
297
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
375
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
301
378
plaintext_length = -1;
303
380
gpgme_decrypt_result_t result;
304
381
result = gpgme_op_decrypt_result(mc.ctx);
305
382
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
312
389
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
392
gpgme_recipient_t recipient;
316
393
recipient = result->recipients;
317
394
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
324
402
recipient = recipient->next;
423
501
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
425
503
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
430
safer_gnutls_strerror(ret));
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
431
506
gnutls_global_deinit();
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
441
517
ret = gnutls_certificate_set_openpgp_key_file
442
518
(mc.cred, pubkeyfilename, seckeyfilename,
443
519
GNUTLS_OPENPGP_FMT_BASE64);
444
520
if(ret != GNUTLS_E_SUCCESS){
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
453
529
/* GnuTLS server initialization */
454
530
ret = gnutls_dh_params_init(&mc.dh_params);
455
531
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
460
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
538
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
1015
1105
signal_received = sig;
1016
1106
int old_errno = errno;
1107
/* set main loop to exit */
1017
1108
if(mc.simple_poll != NULL){
1018
1109
avahi_simple_poll_quit(mc.simple_poll);
1020
1111
errno = old_errno;
1114
bool get_flags(const char *ifname, struct ifreq *ifr){
1117
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
perror_plus("socket");
1122
strcpy(ifr->ifr_name, ifname);
1123
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1126
perror_plus("ioctl SIOCGIFFLAGS");
1133
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
/* Reject the loopback device */
1136
if(ifr->ifr_flags & IFF_LOOPBACK){
1138
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1143
/* Accept point-to-point devices only if connect_to is specified */
1144
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1146
fprintf_plus(stderr, "Accepting point-to-point interface"
1147
" \"%s\"\n", ifname);
1151
/* Otherwise, reject non-broadcast-capable devices */
1152
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1154
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1155
" \"%s\"\n", ifname);
1159
/* Reject non-ARP interfaces (including dummy interfaces) */
1160
if(ifr->ifr_flags & IFF_NOARP){
1162
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1168
/* Accept this device */
1170
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1176
* This function determines if a directory entry in /sys/class/net
1177
* corresponds to an acceptable network device.
1178
* (This function is passed to scandir(3) as a filter function.)
1180
int good_interface(const struct dirent *if_entry){
1181
if(if_entry->d_name[0] == '.'){
1186
if(not get_flags(if_entry->d_name, &ifr)){
1188
fprintf_plus(stderr, "Failed to get flags for interface "
1189
"\"%s\"\n", if_entry->d_name);
1194
if(not good_flags(if_entry->d_name, &ifr)){
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1211
if(not get_flags(if_entry->d_name, &ifr)){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1237
if(not good_flags(if_entry->d_name, &ifr)){
1243
int notdotentries(const struct dirent *direntry){
1244
/* Skip "." and ".." */
1245
if(direntry->d_name[0] == '.'
1246
and (direntry->d_name[1] == '\0'
1247
or (direntry->d_name[1] == '.'
1248
and direntry->d_name[2] == '\0'))){
1254
/* Is this directory entry a runnable program? */
1255
int runnable_hook(const struct dirent *direntry){
1260
if((direntry->d_name)[0] == '\0'){
1265
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1266
"abcdefghijklmnopqrstuvwxyz"
1269
if((direntry->d_name)[sret] != '\0'){
1270
/* Contains non-allowed characters */
1272
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
perror_plus("asprintf");
1285
ret = stat(fullname, &st);
1288
perror_plus("Could not stat hook");
1292
if(not (S_ISREG(st.st_mode))){
1293
/* Not a regular file */
1295
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1300
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1301
/* Not executable */
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1309
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1317
struct timespec now;
1318
struct timespec waited_time;
1319
intmax_t block_time;
1322
if(mc.current_server == NULL){
1324
fprintf_plus(stderr, "Wait until first server is found."
1327
ret = avahi_simple_poll_iterate(s, -1);
1330
fprintf_plus(stderr, "Check current_server if we should run"
1333
/* the current time */
1334
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1336
perror_plus("clock_gettime");
1339
/* Calculating in ms how long time between now and server
1340
who we visted longest time ago. Now - last seen. */
1341
waited_time.tv_sec = (now.tv_sec
1342
- mc.current_server->last_seen.tv_sec);
1343
waited_time.tv_nsec = (now.tv_nsec
1344
- mc.current_server->last_seen.tv_nsec);
1345
/* total time is 10s/10,000ms.
1346
Converting to s from ms by dividing by 1,000,
1347
and ns to ms by dividing by 1,000,000. */
1348
block_time = ((retry_interval
1349
- ((intmax_t)waited_time.tv_sec * 1000))
1350
- ((intmax_t)waited_time.tv_nsec / 1000000));
1353
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
if(block_time <= 0){
1358
ret = start_mandos_communication(mc.current_server->ip,
1359
mc.current_server->port,
1360
mc.current_server->if_index,
1361
mc.current_server->af);
1363
avahi_simple_poll_quit(mc.simple_poll);
1366
ret = clock_gettime(CLOCK_MONOTONIC,
1367
&mc.current_server->last_seen);
1369
perror_plus("clock_gettime");
1372
mc.current_server = mc.current_server->next;
1373
block_time = 0; /* Call avahi to find new Mandos
1374
servers, but don't block */
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1380
if (ret > 0 or errno != EINTR){
1381
return (ret != 1) ? ret : 0;
1387
bool run_network_hooks(const char *mode, const char *interface,
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1395
perror_plus("scandir");
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
perror_plus("asprintf");
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1410
pid_t hook_pid = fork();
1413
/* Raise privileges */
1417
perror_plus("seteuid");
1419
/* Raise privileges even more */
1423
perror_plus("setuid");
1429
perror_plus("setgid");
1431
/* Reset supplementary groups */
1433
ret = setgroups(0, NULL);
1435
perror_plus("setgroups");
1437
dup2(devnull, STDIN_FILENO);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
perror_plus("setenv");
1445
ret = setenv("DEVICE", interface, 1);
1447
perror_plus("setenv");
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
perror_plus("setenv");
1455
ret = setenv("MODE", mode, 1);
1457
perror_plus("setenv");
1461
ret = asprintf(&delaystring, "%f", delay);
1463
perror_plus("asprintf");
1466
ret = setenv("DELAY", delaystring, 1);
1469
perror_plus("setenv");
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1023
1514
int main(int argc, char *argv[]){
1024
1515
AvahiSServiceBrowser *sb = NULL;
1708
/* Work around Debian bug #633582:
1709
<http://bugs.debian.org/633582> */
1711
/* Re-raise priviliges */
1715
perror_plus("seteuid");
1719
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1720
int seckey_fd = open(seckey, O_RDONLY);
1721
if(seckey_fd == -1){
1722
perror_plus("open");
1724
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
perror_plus("fstat");
1728
if(S_ISREG(st.st_mode)
1729
and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1732
perror_plus("fchown");
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1747
perror_plus("fstat");
1749
if(S_ISREG(st.st_mode)
1750
and st.st_uid == 0 and st.st_gid == 0){
1751
ret = fchown(pubkey_fd, uid, gid);
1753
perror_plus("fchown");
1757
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
/* Lower privileges */
1765
perror_plus("seteuid");
1770
/* Run network hooks */
1771
if(not run_network_hooks("start", interface, delay)){
1197
1776
avahi_set_log_function(empty_log);
1779
if(interface[0] == '\0'){
1780
struct dirent **direntries;
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1785
/* No up interfaces, look for any good interfaces */
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1791
/* Pick the first interface returned */
1792
interface = strdup(direntries[0]->d_name);
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
if(interface == NULL){
1797
perror_plus("malloc");
1799
exitcode = EXIT_FAILURE;
1805
fprintf_plus(stderr, "Could not find a network interface\n");
1806
exitcode = EXIT_FAILURE;
1200
1811
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1812
from the signal handler */
1202
1813
/* Initialize the pseudo-RNG for Avahi */
1203
1814
srand((unsigned int) time(NULL));
1204
1815
mc.simple_poll = avahi_simple_poll_new();
1205
1816
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1817
fprintf_plus(stderr,
1818
"Avahi: Failed to create simple poll object.\n");
1207
1819
exitcode = EX_UNAVAILABLE;
1608
2215
gpgme_release(mc.ctx);
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
2218
/* Cleans up the circular linked list of Mandos servers the client
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2232
/* Re-raise priviliges */
1615
2235
ret = seteuid(0);
2237
perror_plus("seteuid");
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
1620
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2244
perror_plus("ioctl SIOCGIFFLAGS");
2245
} else if(network.ifr_flags & IFF_UP){
1624
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
perror("ioctl SIOCSIFFLAGS");
2249
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1630
2252
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1634
/* Lower privileges permanently */
2254
perror_plus("close");
2258
/* Lower privileges permanently */
2262
perror_plus("setuid");
1643
/* Removes the temp directory used by GPGME */
2265
/* Removes the GPGME temp directory and all files inside */
1644
2266
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'))){
2267
struct dirent **direntries = NULL;
2268
struct dirent *direntry = NULL;
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
if (numentries > 0){
2272
for(int i = 0; i < numentries; i++){
2273
direntry = direntries[i];
1665
2274
char *fullname = NULL;
1666
2275
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2276
direntry->d_name);
2278
perror_plus("asprintf");
1672
2281
ret = remove(fullname);
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1677
2286
free(fullname);
2290
/* need to clean even if 0 because man page doesn't specify */
2292
if (numentries == -1){
2293
perror_plus("scandir");
1681
2295
ret = rmdir(tempdir);
1682
2296
if(ret == -1 and errno != ENOENT){
2297
perror_plus("rmdir");