241
160
* Helper function to insert pub and seckey to the engine keyring.
243
162
bool import_key(const char *filename){
246
164
gpgme_data_t pgp_data;
248
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
254
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
173
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
258
175
gpgme_strsource(rc), gpgme_strerror(rc));
262
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
263
180
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
266
182
gpgme_strsource(rc), gpgme_strerror(rc));
270
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
272
perror_plus("close");
274
190
gpgme_data_release(pgp_data);
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
284
199
gpgme_check_version(NULL);
285
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
201
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
203
gpgme_strsource(rc), gpgme_strerror(rc));
293
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
294
208
rc = gpgme_get_engine_info(&engine_info);
295
209
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
211
gpgme_strsource(rc), gpgme_strerror(rc));
369
278
/* Decrypt data from the cryptotext data buffer to the plaintext
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
281
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
283
gpgme_strsource(rc), gpgme_strerror(rc));
376
284
plaintext_length = -1;
378
286
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
380
288
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
291
fprintf(stderr, "Unsupported algorithm: %s\n",
386
292
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
293
fprintf(stderr, "Wrong key usage: %u\n",
389
294
result->wrong_key_usage);
390
295
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
394
298
gpgme_recipient_t recipient;
395
299
recipient = result->recipients;
396
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
406
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;
508
409
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
510
411
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
416
safer_gnutls_strerror(ret));
513
417
gnutls_global_deinit();
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
524
427
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
526
429
GNUTLS_OPENPGP_FMT_BASE64);
527
430
if(ret != GNUTLS_E_SUCCESS){
529
"Mandos plugin mandos-client: "
530
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
537
439
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
539
441
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
443
" %s\n", safer_gnutls_strerror(ret));
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
447
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
449
safer_gnutls_strerror(ret));
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
559
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
560
460
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
565
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
567
468
/* GnuTLS session creation */
569
ret = gnutls_init(session, GNUTLS_SERVER);
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
574
470
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
472
safer_gnutls_strerror(ret));
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
gnutls_deinit(*session);
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
589
478
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", 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));
594
482
gnutls_deinit(*session);
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
603
gnutls_deinit(*session);
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
607
489
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
491
safer_gnutls_strerror(ret));
611
492
gnutls_deinit(*session);
615
496
/* ignore client certificate if any. */
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
1111
864
case AVAHI_BROWSER_ALL_FOR_NOW:
1112
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1121
/* Signal handler that stops main loop after SIGTERM */
1122
static void handle_sigterm(int sig){
1127
signal_received = sig;
1128
int old_errno = errno;
1129
/* set main loop to exit */
1130
if(mc.simple_poll != NULL){
1131
avahi_simple_poll_quit(mc.simple_poll);
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
perror_plus("socket");
1144
strcpy(ifr->ifr_name, ifname);
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1148
perror_plus("ioctl SIOCGIFFLAGS");
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1165
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1173
/* Otherwise, reject non-broadcast-capable devices */
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
if(ifr->ifr_flags & IFF_NOARP){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1190
/* Accept this device */
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1199
* This function determines if a directory entry in /sys/class/net
1200
* corresponds to an acceptable network device.
1201
* (This function is passed to scandir(3) as a filter function.)
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1209
if(not get_flags(if_entry->d_name, &ifr)){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1218
if(not good_flags(if_entry->d_name, &ifr)){
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1235
if(not get_flags(if_entry->d_name, &ifr)){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1264
if(not good_flags(if_entry->d_name, &ifr)){
1270
int notdotentries(const struct dirent *direntry){
1271
/* Skip "." and ".." */
1272
if(direntry->d_name[0] == '.'
1273
and (direntry->d_name[1] == '\0'
1274
or (direntry->d_name[1] == '.'
1275
and direntry->d_name[2] == '\0'))){
1281
/* Is this directory entry a runnable program? */
1282
int runnable_hook(const struct dirent *direntry){
1286
if((direntry->d_name)[0] == '\0'){
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1299
if(((direntry->d_name)[0] == '#')
1301
/* Temporary #name# */
1305
/* XXX more rules here */
1307
ret = stat(direntry->d_name, &st);
1310
perror_plus("Could not stat plugin");
1314
if(not (S_ISREG(st.st_mode))){
1315
/* Not a regular file */
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
/* Not executable */
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1327
struct timespec now;
1328
struct timespec waited_time;
1329
intmax_t block_time;
1332
if(mc.current_server == NULL){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1337
ret = avahi_simple_poll_iterate(s, -1);
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1347
perror_plus("clock_gettime");
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc.current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc.current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc.current_server->ip,
1370
mc.current_server->port,
1371
mc.current_server->if_index,
1372
mc.current_server->af);
1374
avahi_simple_poll_quit(mc.simple_poll);
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc.current_server->last_seen);
1380
perror_plus("clock_gettime");
1383
mc.current_server = mc.current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1398
873
int main(int argc, char *argv[]){
1399
874
AvahiSServiceBrowser *sb = NULL;
1402
877
intmax_t tmpmax;
1404
879
int exitcode = EXIT_SUCCESS;
1405
const char *interface = "";
880
const char *interface = "eth0";
1406
881
struct ifreq network;
1408
bool take_down_interface = false;
885
char *connect_to = NULL;
1411
886
char tempdir[] = "/tmp/mandosXXXXXX";
1412
887
bool tempdir_created = false;
1413
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1414
889
const char *seckey = PATHDIR "/" SECKEY;
1415
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" };
1417
895
bool gnutls_initialized = false;
1418
896
bool gpgme_initialized = false;
1420
double retry_interval = 10; /* 10s between trying a server and
1421
retrying the same server again */
1423
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1424
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1429
/* Lower any group privileges we might have, just to be safe */
1433
perror_plus("setgid");
1436
/* Lower user privileges (temporarily) */
1440
perror_plus("seteuid");
1448
900
struct argp_option options[] = {
1526
964
mc.priority = arg;
1528
966
case 131: /* --delay */
1530
delay = strtof(arg, &tmp);
1531
if(errno != 0 or tmp == arg or *tmp != '\0'){
1532
argp_error(state, "Bad delay");
1534
case 132: /* --retry */
1536
retry_interval = strtod(arg, &tmp);
1537
if(errno != 0 or tmp == arg or *tmp != '\0'
1538
or (retry_interval * 1000) > INT_MAX
1539
or retry_interval < 0){
1540
argp_error(state, "Bad retry interval");
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
1544
* These reproduce what we would get without ARGP_NO_HELP
1546
case '?': /* --help */
1547
argp_state_help(state, state->out_stream,
1548
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1549
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1550
case -3: /* --usage */
1551
argp_state_help(state, state->out_stream,
1552
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
1556
exit(argp_err_exit_status);
1559
978
return ARGP_ERR_UNKNOWN;
1564
983
struct argp argp = { .options = options, .parser = parse_opt,
1566
985
.doc = "Mandos client -- Get and decrypt"
1567
986
" passwords from a Mandos server" };
1568
ret = argp_parse(&argp, argc, argv,
1569
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1576
perror_plus("argp_parse");
1577
exitcode = EX_OSERR;
1580
exitcode = EX_USAGE;
1586
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1590
/* Re-raise priviliges */
1594
perror_plus("seteuid");
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1604
perror_plus("fstat");
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1609
perror_plus("fchown");
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1624
perror_plus("fstat");
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1629
perror_plus("fchown");
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1637
/* Lower privileges */
1641
perror_plus("seteuid");
1645
/* Find network hooks and run them */
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1652
perror_plus("scandir");
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1661
perror_plus("asprintf");
1664
pid_t hook_pid = fork();
1667
dup2(devnull, STDIN_FILENO);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1672
perror_plus("setenv");
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1677
perror_plus("setenv");
1680
ret = setenv("MODE", "start", 1);
1682
perror_plus("setenv");
1686
ret = asprintf(&delaystring, "%f", delay);
1688
perror_plus("asprintf");
1691
ret = setenv("DELAY", delaystring, 1);
1694
perror_plus("setenv");
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1741
avahi_set_log_function(empty_log);
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1750
/* No up interfaces, look for any good interfaces */
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1762
if(interface == NULL){
1763
perror_plus("malloc");
1765
exitcode = EXIT_FAILURE;
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"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");
1773
990
exitcode = EXIT_FAILURE;
1778
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1779
from the signal handler */
1780
/* Initialize the pseudo-RNG for Avahi */
1781
srand((unsigned int) time(NULL));
1782
mc.simple_poll = avahi_simple_poll_new();
1783
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1786
exitcode = EX_UNAVAILABLE;
1790
sigemptyset(&sigterm_action.sa_mask);
1791
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1793
perror_plus("sigaddset");
1794
exitcode = EX_OSERR;
1797
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1799
perror_plus("sigaddset");
1800
exitcode = EX_OSERR;
1803
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1805
perror_plus("sigaddset");
1806
exitcode = EX_OSERR;
1809
/* Need to check if the handler is SIG_IGN before handling:
1810
| [[info:libc:Initial Signal Actions]] |
1811
| [[info:libc:Basic Signal Handling]] |
1813
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1815
perror_plus("sigaction");
1818
if(old_sigterm_action.sa_handler != SIG_IGN){
1819
ret = sigaction(SIGINT, &sigterm_action, NULL);
1821
perror_plus("sigaction");
1822
exitcode = EX_OSERR;
1826
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1828
perror_plus("sigaction");
1831
if(old_sigterm_action.sa_handler != SIG_IGN){
1832
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1834
perror_plus("sigaction");
1835
exitcode = EX_OSERR;
1839
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1841
perror_plus("sigaction");
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1847
perror_plus("sigaction");
1848
exitcode = EX_OSERR;
1853
995
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1867
/* Re-raise priviliges */
1871
perror_plus("seteuid");
996
if(interface[0] != '\0'){
1874
997
#ifdef __linux__
1875
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1876
messages about the network interface to mess up the prompt */
999
messages to mess up the prompt */
1877
1000
ret = klogctl(8, NULL, 5);
1878
1001
bool restore_loglevel = true;
1880
1003
restore_loglevel = false;
1881
perror_plus("klogctl");
1883
#endif /* __linux__ */
1885
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1011
exitcode = EXIT_FAILURE;
1889
1012
#ifdef __linux__
1890
1013
if(restore_loglevel){
1891
1014
ret = klogctl(7, NULL, 0);
1893
perror_plus("klogctl");
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1901
perror_plus("seteuid");
1905
1022
strcpy(network.ifr_name, interface);
1906
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1908
perror_plus("ioctl SIOCGIFFLAGS");
1025
perror("ioctl SIOCGIFFLAGS");
1909
1026
#ifdef __linux__
1910
1027
if(restore_loglevel){
1911
1028
ret = klogctl(7, NULL, 0);
1913
perror_plus("klogctl");
1916
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1922
perror_plus("seteuid");
1034
exitcode = EXIT_FAILURE;
1926
1037
if((network.ifr_flags & IFF_UP) == 0){
1927
1038
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1929
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1934
1043
#ifdef __linux__
1935
1044
if(restore_loglevel){
1936
1045
ret = klogctl(7, NULL, 0);
1938
perror_plus("klogctl");
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1946
perror_plus("seteuid");
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1054
/* sleep checking until interface is running */
1953
1055
for(int i=0; i < delay * 4; i++){
1954
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1956
perror_plus("ioctl SIOCGIFFLAGS");
1058
perror("ioctl SIOCGIFFLAGS");
1957
1059
} else if(network.ifr_flags & IFF_RUNNING){
1960
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
1063
ret = nanosleep(&sleeptime, NULL);
1962
1064
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1065
perror("nanosleep");
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1970
perror_plus("close");
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1973
1072
#ifdef __linux__
1974
1073
if(restore_loglevel){
1975
1074
/* Restores kernel loglevel to default */
1976
1075
ret = klogctl(7, NULL, 0);
1978
perror_plus("klogctl");
1981
#endif /* __linux__ */
1982
/* Lower privileges */
1984
if(take_down_interface){
1985
/* Lower privileges */
1988
perror_plus("seteuid");
1991
/* Lower privileges permanently */
1994
perror_plus("setuid");
2003
ret = init_gnutls_global(pubkey, seckey);
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2007
exitcode = EX_UNAVAILABLE;
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
2010
1103
gnutls_initialized = true;
2017
1106
if(mkdtemp(tempdir) == NULL){
2018
perror_plus("mkdtemp");
2021
1110
tempdir_created = true;
2027
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
2030
exitcode = EX_UNAVAILABLE;
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
2033
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;
2040
1129
if(connect_to != NULL){
2199
1248
if(gpgme_initialized){
2200
1249
gpgme_release(mc.ctx);
2203
/* Cleans up the circular linked list of Mandos servers the client
2205
if(mc.current_server != NULL){
2206
mc.current_server->prev->next = NULL;
2207
while(mc.current_server != NULL){
2208
server *next = mc.current_server->next;
2209
free(mc.current_server);
2210
mc.current_server = next;
2214
/* XXX run network hooks "stop" here */
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2222
perror_plus("seteuid");
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2237
perror_plus("close");
2239
/* Lower privileges permanently */
2243
perror_plus("setuid");
2248
/* Removes the GPGME temp directory and all files inside */
1252
/* Removes the temp directory used by GPGME */
2249
1253
if(tempdir_created){
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
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'))){
2257
1274
char *fullname = NULL;
2258
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
2259
1276
direntry->d_name);
2261
perror_plus("asprintf");
2264
1281
ret = remove(fullname);
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2269
1286
free(fullname);
2273
/* need to clean even if 0 because man page doesn't specify */
2275
if (numentries == -1){
2276
perror_plus("scandir");
2278
1290
ret = rmdir(tempdir);
2279
1291
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");
2285
sigemptyset(&old_sigterm_action.sa_mask);
2286
old_sigterm_action.sa_handler = SIG_DFL;
2287
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2288
&old_sigterm_action,
2291
perror_plus("sigaction");
2294
ret = raise(signal_received);
2295
} while(ret != 0 and errno == EINTR);
2297
perror_plus("raise");
2300
TEMP_FAILURE_RETRY(pause());
2303
1296
return exitcode;