183
257
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
189
263
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
264
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));
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
196
270
rc = gpgme_op_import(mc.ctx, pgp_data);
197
271
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
203
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
perror_plus("close");
207
281
gpgme_data_release(pgp_data);
212
fprintf(stderr, "Initializing GPGME\n");
286
fprintf_plus(stderr, "Initializing GPGME\n");
216
290
gpgme_check_version(NULL);
217
291
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
292
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
224
/* Set GPGME home directory for the OpenPGP engine only */
298
/* Set GPGME home directory for the OpenPGP engine only */
225
299
rc = gpgme_get_engine_info(&engine_info);
226
300
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
231
305
while(engine_info != NULL){
296
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
297
374
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
300
377
plaintext_length = -1;
302
379
gpgme_decrypt_result_t result;
303
380
result = gpgme_op_decrypt_result(mc.ctx);
304
381
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
382
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);
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
311
388
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
391
gpgme_recipient_t recipient;
315
392
recipient = result->recipients;
316
393
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
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
323
401
recipient = recipient->next;
422
500
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
502
if(ret != GNUTLS_E_SUCCESS){
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
safer_gnutls_strerror(ret));
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
430
505
gnutls_global_deinit();
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
440
516
ret = gnutls_certificate_set_openpgp_key_file
441
517
(mc.cred, pubkeyfilename, seckeyfilename,
442
518
GNUTLS_OPENPGP_FMT_BASE64);
443
519
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));
521
"Error[%d] while reading the OpenPGP key pair ('%s',"
522
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
523
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
524
safer_gnutls_strerror(ret));
452
528
/* GnuTLS server initialization */
453
529
ret = gnutls_dh_params_init(&mc.dh_params);
454
530
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
459
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
537
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
970
1101
signal_received = sig;
971
1102
int old_errno = errno;
1103
/* set main loop to exit */
972
1104
if(mc.simple_poll != NULL){
973
1105
avahi_simple_poll_quit(mc.simple_poll);
975
1107
errno = old_errno;
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
perror_plus("socket");
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1122
perror_plus("ioctl SIOCGIFFLAGS");
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1139
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1147
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
/* Accept this device */
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1182
if(not get_flags(if_entry->d_name, &ifr)){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1190
if(not good_flags(if_entry->d_name, &ifr)){
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1207
if(not get_flags(if_entry->d_name, &ifr)){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if(not good_flags(if_entry->d_name, &ifr)){
1239
int notdotentries(const struct dirent *direntry){
1240
/* Skip "." and ".." */
1241
if(direntry->d_name[0] == '.'
1242
and (direntry->d_name[1] == '\0'
1243
or (direntry->d_name[1] == '.'
1244
and direntry->d_name[2] == '\0'))){
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1256
if((direntry->d_name)[0] == '\0'){
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
perror_plus("asprintf");
1281
ret = stat(fullname, &st);
1284
perror_plus("Could not stat hook");
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1309
struct timespec now;
1310
struct timespec waited_time;
1311
intmax_t block_time;
1314
if(mc.current_server == NULL){
1316
fprintf_plus(stderr, "Wait until first server is found."
1319
ret = avahi_simple_poll_iterate(s, -1);
1322
fprintf_plus(stderr, "Check current_server if we should run"
1325
/* the current time */
1326
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1328
perror_plus("clock_gettime");
1331
/* Calculating in ms how long time between now and server
1332
who we visted longest time ago. Now - last seen. */
1333
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1335
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1337
/* total time is 10s/10,000ms.
1338
Converting to s from ms by dividing by 1,000,
1339
and ns to ms by dividing by 1,000,000. */
1340
block_time = ((retry_interval
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1349
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1355
avahi_simple_poll_quit(mc.simple_poll);
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1361
perror_plus("clock_gettime");
1364
mc.current_server = mc.current_server->next;
1365
block_time = 0; /* Call avahi to find new Mandos
1366
servers, but don't block */
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1372
if (ret > 0 or errno != EINTR){
1373
return (ret != 1) ? ret : 0;
1379
bool run_network_hooks(const char *mode, const char *interface,
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1387
perror_plus("scandir");
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[i];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1395
perror_plus("asprintf");
1399
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1402
pid_t hook_pid = fork();
1405
dup2(devnull, STDIN_FILENO);
1407
dup2(STDERR_FILENO, STDOUT_FILENO);
1408
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1410
perror_plus("setenv");
1413
ret = setenv("DEVICE", interface, 1);
1415
perror_plus("setenv");
1418
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1420
perror_plus("setenv");
1423
ret = setenv("MODE", mode, 1);
1425
perror_plus("setenv");
1429
ret = asprintf(&delaystring, "%f", delay);
1431
perror_plus("asprintf");
1434
ret = setenv("DELAY", delaystring, 1);
1437
perror_plus("setenv");
1441
ret = execl(fullname, direntry->d_name, mode, NULL);
1442
perror_plus("execl");
1445
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1446
perror_plus("waitpid");
1450
if(WIFEXITED(status)){
1451
if(WEXITSTATUS(status) != 0){
1452
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1453
" with status %d\n", direntry->d_name,
1454
WEXITSTATUS(status));
1458
} else if(WIFSIGNALED(status)){
1459
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1460
" signal %d\n", direntry->d_name,
1465
fprintf_plus(stderr, "Warning: network hook \"%s\""
1466
" crashed\n", direntry->d_name);
978
1481
int main(int argc, char *argv[]){
979
1482
AvahiSServiceBrowser *sb = NULL;
1677
/* Work around Debian bug #633582:
1678
<http://bugs.debian.org/633582> */
1681
/* Re-raise priviliges */
1685
perror_plus("seteuid");
1688
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1689
int seckey_fd = open(seckey, O_RDONLY);
1690
if(seckey_fd == -1){
1691
perror_plus("open");
1693
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1695
perror_plus("fstat");
1697
if(S_ISREG(st.st_mode)
1698
and st.st_uid == 0 and st.st_gid == 0){
1699
ret = fchown(seckey_fd, uid, gid);
1701
perror_plus("fchown");
1705
TEMP_FAILURE_RETRY(close(seckey_fd));
1709
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1710
int pubkey_fd = open(pubkey, O_RDONLY);
1711
if(pubkey_fd == -1){
1712
perror_plus("open");
1714
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1716
perror_plus("fstat");
1718
if(S_ISREG(st.st_mode)
1719
and st.st_uid == 0 and st.st_gid == 0){
1720
ret = fchown(pubkey_fd, uid, gid);
1722
perror_plus("fchown");
1726
TEMP_FAILURE_RETRY(close(pubkey_fd));
1730
/* Lower privileges */
1734
perror_plus("seteuid");
1738
/* Run network hooks */
1741
/* Re-raise priviliges */
1745
perror_plus("seteuid");
1748
if(not run_network_hooks("start", interface, delay)){
1752
/* Lower privileges */
1756
perror_plus("seteuid");
1152
1762
avahi_set_log_function(empty_log);
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1771
/* No up interfaces, look for any good interfaces */
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1780
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1782
if(interface == NULL){
1783
perror_plus("malloc");
1785
exitcode = EXIT_FAILURE;
1791
fprintf_plus(stderr, "Could not find a network interface\n");
1792
exitcode = EXIT_FAILURE;
1155
1797
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
1798
from the signal handler */
1157
1799
/* Initialize the pseudo-RNG for Avahi */
1158
1800
srand((unsigned int) time(NULL));
1159
1801
mc.simple_poll = avahi_simple_poll_new();
1160
1802
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1803
fprintf_plus(stderr,
1804
"Avahi: Failed to create simple poll object.\n");
1805
exitcode = EX_UNAVAILABLE;
1166
1809
sigemptyset(&sigterm_action.sa_mask);
1167
1810
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1812
perror_plus("sigaddset");
1813
exitcode = EX_OSERR;
1173
1816
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1818
perror_plus("sigaddset");
1819
exitcode = EX_OSERR;
1179
1822
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1824
perror_plus("sigaddset");
1825
exitcode = EX_OSERR;
1185
1828
/* Need to check if the handler is SIG_IGN before handling:
1544
2200
if(gpgme_initialized){
1545
2201
gpgme_release(mc.ctx);
2204
/* Cleans up the circular linked list of Mandos servers the client
2206
if(mc.current_server != NULL){
2207
mc.current_server->prev->next = NULL;
2208
while(mc.current_server != NULL){
2209
server *next = mc.current_server->next;
2210
free(mc.current_server);
2211
mc.current_server = next;
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
2215
/* Re-raise priviliges */
2221
perror_plus("seteuid");
2224
/* Run network hooks */
2225
if(not run_network_hooks("stop", interface, delay)){
2229
/* Take down the network interface */
2230
if(take_down_interface and geteuid() == 0){
1557
2231
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
2233
perror_plus("ioctl SIOCGIFFLAGS");
2234
} else if(network.ifr_flags & IFF_UP){
1561
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
2236
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1564
perror("ioctl SIOCSIFFLAGS");
2238
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1567
2241
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1571
/* Lower privileges permanently */
2243
perror_plus("close");
2248
/* Lower privileges permanently */
2252
perror_plus("setuid");
1580
/* Removes the temp directory used by GPGME */
2256
/* Removes the GPGME temp directory and all files inside */
1581
2257
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'))){
2258
struct dirent **direntries = NULL;
2259
struct dirent *direntry = NULL;
2260
int numentries = scandir(tempdir, &direntries, notdotentries,
2262
if (numentries > 0){
2263
for(int i = 0; i < numentries; i++){
2264
direntry = direntries[i];
1602
2265
char *fullname = NULL;
1603
2266
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
2267
direntry->d_name);
2269
perror_plus("asprintf");
1609
2272
ret = remove(fullname);
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2274
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1614
2277
free(fullname);
2281
/* need to clean even if 0 because man page doesn't specify */
2283
if (numentries == -1){
2284
perror_plus("scandir");
1618
2286
ret = rmdir(tempdir);
1619
2287
if(ret == -1 and errno != ENOENT){
2288
perror_plus("rmdir");