250
160
* Helper function to insert pub and seckey to the engine keyring.
252
162
bool import_key(const char *filename){
255
164
gpgme_data_t pgp_data;
257
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
263
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
264
173
if(rc != GPG_ERR_NO_ERROR){
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
270
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
271
180
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
277
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
perror_plus("close");
281
190
gpgme_data_release(pgp_data);
286
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
290
199
gpgme_check_version(NULL);
291
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
292
201
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
298
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
299
208
rc = gpgme_get_engine_info(&engine_info);
300
209
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
305
214
while(engine_info != NULL){
346
254
ssize_t plaintext_length = 0;
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
352
260
/* Create new GPGME data buffer from memory cryptotext */
353
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
263
if(rc != GPG_ERR_NO_ERROR){
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
361
269
/* Create new empty GPGME data buffer for the plaintext */
362
270
rc = gpgme_data_new(&dh_plain);
363
271
if(rc != GPG_ERR_NO_ERROR){
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
367
274
gpgme_data_release(dh_crypto);
371
278
/* Decrypt data from the cryptotext data buffer to the plaintext
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
281
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
377
284
plaintext_length = -1;
379
286
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
381
288
if(result == NULL){
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
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);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
388
295
if(result->file_name != NULL){
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
391
298
gpgme_recipient_t recipient;
392
299
recipient = result->recipients;
393
while(recipient != NULL){
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
401
recipient = recipient->next;
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
308
recipient = recipient->next;
500
409
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
502
411
if(ret != GNUTLS_E_SUCCESS){
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
416
safer_gnutls_strerror(ret));
505
417
gnutls_global_deinit();
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
516
427
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
518
429
GNUTLS_OPENPGP_FMT_BASE64);
519
430
if(ret != GNUTLS_E_SUCCESS){
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));
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
528
439
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
530
441
if(ret != GNUTLS_E_SUCCESS){
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
447
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
549
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
550
460
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
555
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
557
468
/* GnuTLS session creation */
559
ret = gnutls_init(session, GNUTLS_SERVER);
563
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
564
470
if(ret != GNUTLS_E_SUCCESS){
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
575
gnutls_deinit(*session);
578
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
579
478
if(ret != GNUTLS_E_SUCCESS){
580
fprintf_plus(stderr, "Syntax error at: %s\n", err);
581
fprintf_plus(stderr, "GnuTLS error: %s\n",
582
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
583
482
gnutls_deinit(*session);
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
592
gnutls_deinit(*session);
595
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
489
if(ret != GNUTLS_E_SUCCESS){
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
599
492
gnutls_deinit(*session);
603
496
/* ignore client certificate if any. */
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
1085
864
case AVAHI_BROWSER_ALL_FOR_NOW:
1086
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
fprintf_plus(stderr, "No Mandos server found, still"
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
/* Signal handler that stops main loop after SIGTERM */
1096
static void handle_sigterm(int sig){
1101
signal_received = sig;
1102
int old_errno = errno;
1103
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
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);
1481
873
int main(int argc, char *argv[]){
1482
874
AvahiSServiceBrowser *sb = NULL;
1485
877
intmax_t tmpmax;
1487
879
int exitcode = EXIT_SUCCESS;
1488
const char *interface = "";
880
const char *interface = "eth0";
1489
881
struct ifreq network;
1491
bool take_down_interface = false;
885
char *connect_to = NULL;
1494
886
char tempdir[] = "/tmp/mandosXXXXXX";
1495
887
bool tempdir_created = false;
1496
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1497
889
const char *seckey = PATHDIR "/" SECKEY;
1498
890
const char *pubkey = PATHDIR "/" PUBKEY;
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1500
895
bool gnutls_initialized = false;
1501
896
bool gpgme_initialized = false;
1503
double retry_interval = 10; /* 10s between trying a server and
1504
retrying the same server again */
1506
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1507
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1512
/* Lower any group privileges we might have, just to be safe */
1516
perror_plus("setgid");
1519
/* Lower user privileges (temporarily) */
1523
perror_plus("seteuid");
1531
900
struct argp_option options[] = {
1613
964
mc.priority = arg;
1615
966
case 131: /* --delay */
1617
delay = strtof(arg, &tmp);
1618
if(errno != 0 or tmp == arg or *tmp != '\0'){
1619
argp_error(state, "Bad delay");
1621
case 132: /* --retry */
1623
retry_interval = strtod(arg, &tmp);
1624
if(errno != 0 or tmp == arg or *tmp != '\0'
1625
or (retry_interval * 1000) > INT_MAX
1626
or retry_interval < 0){
1627
argp_error(state, "Bad retry interval");
1630
case 133: /* --network-hook-dir */
1634
* These reproduce what we would get without ARGP_NO_HELP
1636
case '?': /* --help */
1637
argp_state_help(state, state->out_stream,
1638
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1639
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1640
case -3: /* --usage */
1641
argp_state_help(state, state->out_stream,
1642
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1643
case 'V': /* --version */
1644
fprintf_plus(state->out_stream,
1645
"Mandos plugin mandos-client: ");
1646
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1647
exit(argp_err_exit_status);
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
1650
978
return ARGP_ERR_UNKNOWN;
1655
983
struct argp argp = { .options = options, .parser = parse_opt,
1657
985
.doc = "Mandos client -- Get and decrypt"
1658
986
" passwords from a Mandos server" };
1659
ret = argp_parse(&argp, argc, argv,
1660
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1667
perror_plus("argp_parse");
1668
exitcode = EX_OSERR;
1671
exitcode = EX_USAGE;
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");
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");
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
1792
990
exitcode = EXIT_FAILURE;
1797
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1798
from the signal handler */
1799
/* Initialize the pseudo-RNG for Avahi */
1800
srand((unsigned int) time(NULL));
1801
mc.simple_poll = avahi_simple_poll_new();
1802
if(mc.simple_poll == NULL){
1803
fprintf_plus(stderr,
1804
"Avahi: Failed to create simple poll object.\n");
1805
exitcode = EX_UNAVAILABLE;
1809
sigemptyset(&sigterm_action.sa_mask);
1810
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1812
perror_plus("sigaddset");
1813
exitcode = EX_OSERR;
1816
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1818
perror_plus("sigaddset");
1819
exitcode = EX_OSERR;
1822
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1824
perror_plus("sigaddset");
1825
exitcode = EX_OSERR;
1828
/* Need to check if the handler is SIG_IGN before handling:
1829
| [[info:libc:Initial Signal Actions]] |
1830
| [[info:libc:Basic Signal Handling]] |
1832
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1834
perror_plus("sigaction");
1837
if(old_sigterm_action.sa_handler != SIG_IGN){
1838
ret = sigaction(SIGINT, &sigterm_action, NULL);
1840
perror_plus("sigaction");
1841
exitcode = EX_OSERR;
1845
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1847
perror_plus("sigaction");
1850
if(old_sigterm_action.sa_handler != SIG_IGN){
1851
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1853
perror_plus("sigaction");
1854
exitcode = EX_OSERR;
1858
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1860
perror_plus("sigaction");
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1872
995
/* If the interface is down, bring it up */
1873
if(strcmp(interface, "none") != 0){
1874
if_index = (AvahiIfIndex) if_nametoindex(interface);
1876
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1877
exitcode = EX_UNAVAILABLE;
1885
/* Re-raise priviliges */
1889
perror_plus("seteuid");
996
if(interface[0] != '\0'){
1892
997
#ifdef __linux__
1893
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1894
messages about the network interface to mess up the prompt */
999
messages to mess up the prompt */
1895
1000
ret = klogctl(8, NULL, 5);
1896
1001
bool restore_loglevel = true;
1898
1003
restore_loglevel = false;
1899
perror_plus("klogctl");
1901
#endif /* __linux__ */
1903
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1905
perror_plus("socket");
1906
exitcode = EX_OSERR;
1011
exitcode = EXIT_FAILURE;
1907
1012
#ifdef __linux__
1908
1013
if(restore_loglevel){
1909
1014
ret = klogctl(7, NULL, 0);
1911
perror_plus("klogctl");
1914
#endif /* __linux__ */
1915
/* Lower privileges */
1919
perror_plus("seteuid");
1923
1022
strcpy(network.ifr_name, interface);
1924
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1926
perror_plus("ioctl SIOCGIFFLAGS");
1025
perror("ioctl SIOCGIFFLAGS");
1927
1026
#ifdef __linux__
1928
1027
if(restore_loglevel){
1929
1028
ret = klogctl(7, NULL, 0);
1931
perror_plus("klogctl");
1934
#endif /* __linux__ */
1935
exitcode = EX_OSERR;
1936
/* Lower privileges */
1940
perror_plus("seteuid");
1034
exitcode = EXIT_FAILURE;
1944
1037
if((network.ifr_flags & IFF_UP) == 0){
1945
1038
network.ifr_flags |= IFF_UP;
1946
take_down_interface = true;
1947
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1949
take_down_interface = false;
1950
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1951
exitcode = EX_OSERR;
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1952
1043
#ifdef __linux__
1953
1044
if(restore_loglevel){
1954
1045
ret = klogctl(7, NULL, 0);
1956
perror_plus("klogctl");
1959
#endif /* __linux__ */
1960
/* Lower privileges */
1964
perror_plus("seteuid");
1969
/* Sleep checking until interface is running.
1970
Check every 0.25s, up to total time of delay */
1054
/* sleep checking until interface is running */
1971
1055
for(int i=0; i < delay * 4; i++){
1972
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1974
perror_plus("ioctl SIOCGIFFLAGS");
1058
perror("ioctl SIOCGIFFLAGS");
1975
1059
} else if(network.ifr_flags & IFF_RUNNING){
1978
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1979
1063
ret = nanosleep(&sleeptime, NULL);
1980
1064
if(ret == -1 and errno != EINTR){
1981
perror_plus("nanosleep");
1065
perror("nanosleep");
1984
if(not take_down_interface){
1985
/* We won't need the socket anymore */
1986
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1988
perror_plus("close");
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
1072
#ifdef __linux__
1992
1073
if(restore_loglevel){
1993
1074
/* Restores kernel loglevel to default */
1994
1075
ret = klogctl(7, NULL, 0);
1996
perror_plus("klogctl");
1999
#endif /* __linux__ */
2000
/* Lower privileges */
2002
/* Lower privileges */
2005
perror_plus("seteuid");
2013
ret = init_gnutls_global(pubkey, seckey);
2015
fprintf_plus(stderr, "init_gnutls_global failed\n");
2016
exitcode = EX_UNAVAILABLE;
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
2019
1103
gnutls_initialized = true;
2026
1106
if(mkdtemp(tempdir) == NULL){
2027
perror_plus("mkdtemp");
2030
1110
tempdir_created = true;
2036
if(not init_gpgme(pubkey, seckey, tempdir)){
2037
fprintf_plus(stderr, "init_gpgme failed\n");
2038
exitcode = EX_UNAVAILABLE;
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
2041
1117
gpgme_initialized = true;
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
2048
1129
if(connect_to != NULL){
2050
1131
/* (Mainly meant for debugging) */
2051
1132
char *address = strrchr(connect_to, ':');
2052
1133
if(address == NULL){
2053
fprintf_plus(stderr, "No colon in address\n");
2054
exitcode = EX_USAGE;
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
2064
tmpmax = strtoimax(address+1, &tmp, 10);
2065
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2066
or tmpmax != (uint16_t)tmpmax){
2067
fprintf_plus(stderr, "Bad port number\n");
2068
exitcode = EX_USAGE;
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1142
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
2076
1146
port = (uint16_t)tmpmax;
2077
1147
*address = '\0';
1148
address = connect_to;
2078
1149
/* Colon in address indicates IPv6 */
2080
if(strchr(connect_to, ':') != NULL){
1151
if(strchr(address, ':') != NULL){
2082
/* Accept [] around IPv6 address - see RFC 5952 */
2083
if(connect_to[0] == '[' and address[-1] == ']')
2091
address = connect_to;
2097
while(not quit_now){
2098
ret = start_mandos_communication(address, port, if_index, af);
2099
if(quit_now or ret == 0){
2103
fprintf_plus(stderr, "Retrying in %d seconds\n",
2104
(int)retry_interval);
2106
sleep((int)retry_interval);
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1159
exitcode = EXIT_FAILURE;
2110
1161
exitcode = EXIT_SUCCESS;
1167
avahi_set_log_function(empty_log);
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
2138
1199
/* Check if creating the Avahi server object succeeded */
2139
1200
if(mc.server == NULL){
2140
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2141
avahi_strerror(error));
2142
exitcode = EX_UNAVAILABLE;
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
2150
1207
/* Create the Avahi service browser */
2151
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
2152
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2153
NULL, 0, browse_callback, NULL);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
2154
1211
if(sb == NULL){
2155
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2156
avahi_strerror(avahi_server_errno(mc.server)));
2157
exitcode = EX_UNAVAILABLE;
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1213
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
2165
1218
/* Run the main loop */
2168
fprintf_plus(stderr, "Starting Avahi loop search\n");
2171
ret = avahi_loop_with_timeout(mc.simple_poll,
2172
(int)(retry_interval * 1000));
2174
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2175
(ret == 0) ? "successfully" : "with error");
1221
fprintf(stderr, "Starting Avahi loop search\n");
1224
avahi_simple_poll_loop(mc.simple_poll);
2181
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1229
fprintf(stderr, "%s exiting\n", argv[0]);
2184
1232
/* Cleanup things */
2200
1248
if(gpgme_initialized){
2201
1249
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;
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){
2231
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2233
perror_plus("ioctl SIOCGIFFLAGS");
2234
} else if(network.ifr_flags & IFF_UP){
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2238
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2241
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2243
perror_plus("close");
2248
/* Lower privileges permanently */
2252
perror_plus("setuid");
2256
/* Removes the GPGME temp directory and all files inside */
1252
/* Removes the temp directory used by GPGME */
2257
1253
if(tempdir_created){
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];
1255
struct dirent *direntry;
1256
d = opendir(tempdir);
1258
if(errno != ENOENT){
1263
direntry = readdir(d);
1264
if(direntry == NULL){
1267
/* Skip "." and ".." */
1268
if(direntry->d_name[0] == '.'
1269
and (direntry->d_name[1] == '\0'
1270
or (direntry->d_name[1] == '.'
1271
and direntry->d_name[2] == '\0'))){
2265
1274
char *fullname = NULL;
2266
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
2267
1276
direntry->d_name);
2269
perror_plus("asprintf");
2272
1281
ret = remove(fullname);
2274
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2277
1286
free(fullname);
2281
/* need to clean even if 0 because man page doesn't specify */
2283
if (numentries == -1){
2284
perror_plus("scandir");
2286
1290
ret = rmdir(tempdir);
2287
1291
if(ret == -1 and errno != ENOENT){
2288
perror_plus("rmdir");
2293
sigemptyset(&old_sigterm_action.sa_mask);
2294
old_sigterm_action.sa_handler = SIG_DFL;
2295
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2296
&old_sigterm_action,
2299
perror_plus("sigaction");
2302
ret = raise(signal_received);
2303
} while(ret != 0 and errno == EINTR);
2305
perror_plus("raise");
2308
TEMP_FAILURE_RETRY(pause());
2311
1296
return exitcode;