259
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
265
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
266
191
if(rc != GPG_ERR_NO_ERROR){
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
272
197
rc = gpgme_op_import(mc.ctx, pgp_data);
273
198
if(rc != GPG_ERR_NO_ERROR){
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
279
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
281
perror_plus("close");
283
208
gpgme_data_release(pgp_data);
288
fprintf_plus(stderr, "Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
292
217
gpgme_check_version(NULL);
293
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
219
if(rc != GPG_ERR_NO_ERROR){
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
300
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
301
226
rc = gpgme_get_engine_info(&engine_info);
302
227
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
307
232
while(engine_info != NULL){
375
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
376
298
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
379
301
plaintext_length = -1;
381
303
gpgme_decrypt_result_t result;
382
304
result = gpgme_op_decrypt_result(mc.ctx);
383
305
if(result == NULL){
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf_plus(stderr, "Wrong key usage: %u\n",
389
result->wrong_key_usage);
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
390
312
if(result->file_name != NULL){
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
393
315
gpgme_recipient_t recipient;
394
316
recipient = result->recipients;
395
317
while(recipient != NULL){
396
fprintf_plus(stderr, "Public key algorithm: %s\n",
397
gpgme_pubkey_algo_name
398
(recipient->pubkey_algo));
399
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
400
fprintf_plus(stderr, "Secret key available: %s\n",
401
recipient->status == GPG_ERR_NO_SECKEY
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
403
324
recipient = recipient->next;
502
423
/* OpenPGP credentials */
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
504
425
if(ret != GNUTLS_E_SUCCESS){
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
430
safer_gnutls_strerror(ret));
507
431
gnutls_global_deinit();
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
518
441
ret = gnutls_certificate_set_openpgp_key_file
519
442
(mc.cred, pubkeyfilename, seckeyfilename,
520
443
GNUTLS_OPENPGP_FMT_BASE64);
521
444
if(ret != GNUTLS_E_SUCCESS){
523
"Error[%d] while reading the OpenPGP key pair ('%s',"
524
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
525
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
526
safer_gnutls_strerror(ret));
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));
530
453
/* GnuTLS server initialization */
531
454
ret = gnutls_dh_params_init(&mc.dh_params);
532
455
if(ret != GNUTLS_E_SUCCESS){
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
538
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
539
461
if(ret != GNUTLS_E_SUCCESS){
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
1106
1015
signal_received = sig;
1107
1016
int old_errno = errno;
1108
/* set main loop to exit */
1109
1017
if(mc.simple_poll != NULL){
1110
1018
avahi_simple_poll_quit(mc.simple_poll);
1112
1020
errno = old_errno;
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1120
perror_plus("socket");
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
perror_plus("ioctl SIOCGIFFLAGS");
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1136
/* Reject the loopback device */
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1144
/* Accept point-to-point devices only if connect_to is specified */
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1152
/* Otherwise, reject non-broadcast-capable devices */
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1161
if(ifr->ifr_flags & IFF_NOARP){
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1169
/* Accept this device */
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1187
if(not get_flags(if_entry->d_name, &ifr)){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1195
if(not good_flags(if_entry->d_name, &ifr)){
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1212
if(not get_flags(if_entry->d_name, &ifr)){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if(not good_flags(if_entry->d_name, &ifr)){
1244
int notdotentries(const struct dirent *direntry){
1245
/* Skip "." and ".." */
1246
if(direntry->d_name[0] == '.'
1247
and (direntry->d_name[1] == '\0'
1248
or (direntry->d_name[1] == '.'
1249
and direntry->d_name[2] == '\0'))){
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1261
if((direntry->d_name)[0] == '\0'){
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1282
perror_plus("asprintf");
1286
ret = stat(fullname, &st);
1289
perror_plus("Could not stat hook");
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1318
struct timespec now;
1319
struct timespec waited_time;
1320
intmax_t block_time;
1323
if(mc.current_server == NULL){
1325
fprintf_plus(stderr, "Wait until first server is found."
1328
ret = avahi_simple_poll_iterate(s, -1);
1331
fprintf_plus(stderr, "Check current_server if we should run"
1334
/* the current time */
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1337
perror_plus("clock_gettime");
1340
/* Calculating in ms how long time between now and server
1341
who we visted longest time ago. Now - last seen. */
1342
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1344
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1346
/* total time is 10s/10,000ms.
1347
Converting to s from ms by dividing by 1,000,
1348
and ns to ms by dividing by 1,000,000. */
1349
block_time = ((retry_interval
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1364
avahi_simple_poll_quit(mc.simple_poll);
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1370
perror_plus("clock_gettime");
1373
mc.current_server = mc.current_server->next;
1374
block_time = 0; /* Call avahi to find new Mandos
1375
servers, but don't block */
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
if (ret > 0 or errno != EINTR){
1382
return (ret != 1) ? ret : 0;
1388
bool run_network_hooks(const char *mode, const char *interface,
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
perror_plus("scandir");
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1404
perror_plus("asprintf");
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
pid_t hook_pid = fork();
1414
/* Raise privileges */
1418
perror_plus("seteuid");
1420
/* Raise privileges even more */
1424
perror_plus("setuid");
1430
perror_plus("setgid");
1432
/* Reset supplementary groups */
1434
ret = setgroups(0, NULL);
1436
perror_plus("setgroups");
1438
dup2(devnull, STDIN_FILENO);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1443
perror_plus("setenv");
1446
ret = setenv("DEVICE", interface, 1);
1448
perror_plus("setenv");
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1453
perror_plus("setenv");
1456
ret = setenv("MODE", mode, 1);
1458
perror_plus("setenv");
1462
ret = asprintf(&delaystring, "%f", delay);
1464
perror_plus("asprintf");
1467
ret = setenv("DELAY", delaystring, 1);
1470
perror_plus("setenv");
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1517
1023
int main(int argc, char *argv[]){
1518
1024
AvahiSServiceBrowser *sb = NULL;
1711
/* Work around Debian bug #633582:
1712
<http://bugs.debian.org/633582> */
1714
/* Re-raise priviliges */
1718
perror_plus("seteuid");
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1729
perror_plus("fstat");
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1735
perror_plus("fchown");
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1750
perror_plus("fstat");
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1756
perror_plus("fchown");
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1764
/* Lower privileges */
1768
perror_plus("seteuid");
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1779
1197
avahi_set_log_function(empty_log);
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1788
/* No up interfaces, look for any good interfaces */
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1799
if(interface == NULL){
1800
perror_plus("malloc");
1802
exitcode = EXIT_FAILURE;
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1814
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1815
1201
from the signal handler */
1816
1202
/* Initialize the pseudo-RNG for Avahi */
1817
1203
srand((unsigned int) time(NULL));
1818
1204
mc.simple_poll = avahi_simple_poll_new();
1819
1205
if(mc.simple_poll == NULL){
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1822
1207
exitcode = EX_UNAVAILABLE;
2218
1608
gpgme_release(mc.ctx);
2221
/* Cleans up the circular linked list of Mandos servers the client
2223
if(mc.current_server != NULL){
2224
mc.current_server->prev->next = NULL;
2225
while(mc.current_server != NULL){
2226
server *next = mc.current_server->next;
2227
free(mc.current_server);
2228
mc.current_server = next;
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2235
/* Re-raise priviliges */
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
2238
1615
ret = seteuid(0);
2240
perror_plus("seteuid");
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2249
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1627
perror("ioctl SIOCSIFFLAGS");
2255
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
perror_plus("close");
1634
/* Lower privileges permanently */
2261
/* Lower privileges permanently */
2265
perror_plus("setuid");
2268
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2269
1644
if(tempdir_created){
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
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'))){
2277
1665
char *fullname = NULL;
2278
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
1667
direntry->d_name);
2281
perror_plus("asprintf");
2284
1672
ret = remove(fullname);
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2289
1677
free(fullname);
2293
/* need to clean even if 0 because man page doesn't specify */
2295
if (numentries == -1){
2296
perror_plus("scandir");
2298
1681
ret = rmdir(tempdir);
2299
1682
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");