242
160
* Helper function to insert pub and seckey to the engine keyring.
244
162
bool import_key(const char *filename){
247
164
gpgme_data_t pgp_data;
249
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
255
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
173
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
259
175
gpgme_strsource(rc), gpgme_strerror(rc));
263
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
264
180
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
267
182
gpgme_strsource(rc), gpgme_strerror(rc));
271
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
273
perror_plus("close");
275
190
gpgme_data_release(pgp_data);
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
285
199
gpgme_check_version(NULL);
286
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
201
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
290
203
gpgme_strsource(rc), gpgme_strerror(rc));
294
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
295
208
rc = gpgme_get_engine_info(&engine_info);
296
209
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
211
gpgme_strsource(rc), gpgme_strerror(rc));
370
278
/* Decrypt data from the cryptotext data buffer to the plaintext
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
281
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
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(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
291
fprintf(stderr, "Unsupported algorithm: %s\n",
387
292
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
293
fprintf(stderr, "Wrong key usage: %u\n",
390
294
result->wrong_key_usage);
391
295
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
395
298
gpgme_recipient_t recipient;
396
299
recipient = result->recipients;
397
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
407
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;
509
409
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
511
411
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
416
safer_gnutls_strerror(ret));
514
417
gnutls_global_deinit();
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
521
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
525
427
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
527
429
GNUTLS_OPENPGP_FMT_BASE64);
528
430
if(ret != GNUTLS_E_SUCCESS){
530
"Mandos plugin mandos-client: "
531
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
538
439
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
540
441
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
543
443
" %s\n", safer_gnutls_strerror(ret));
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
547
447
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
550
449
safer_gnutls_strerror(ret));
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
560
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
561
460
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
566
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
568
468
/* GnuTLS session creation */
570
ret = gnutls_init(session, GNUTLS_SERVER);
574
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
575
470
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
578
472
safer_gnutls_strerror(ret));
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
586
gnutls_deinit(*session);
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
590
478
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"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));
595
482
gnutls_deinit(*session);
601
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
604
gnutls_deinit(*session);
607
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
608
489
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
611
491
safer_gnutls_strerror(ret));
612
492
gnutls_deinit(*session);
616
496
/* ignore client certificate if any. */
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
1112
864
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1122
/* Signal handler that stops main loop after SIGTERM */
1123
static void handle_sigterm(int sig){
1128
signal_received = sig;
1129
int old_errno = errno;
1130
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1142
perror_plus("socket");
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1149
perror_plus("ioctl SIOCGIFFLAGS");
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1158
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1166
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1174
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1191
/* Accept this device */
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1210
if(not get_flags(if_entry->d_name, &ifr)){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1219
if(not good_flags(if_entry->d_name, &ifr)){
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1236
if(not get_flags(if_entry->d_name, &ifr)){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1265
if(not good_flags(if_entry->d_name, &ifr)){
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1287
if((direntry->d_name)[0] == '\0'){
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1300
if(((direntry->d_name)[0] == '#')
1302
/* Temporary #name# */
1306
/* XXX more rules here */
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1312
perror_plus("asprintf");
1316
ret = stat(fullname, &st);
1319
perror_plus("Could not stat plugin");
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1341
if(mc.current_server == NULL){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1346
ret = avahi_simple_poll_iterate(s, -1);
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1356
perror_plus("clock_gettime");
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1383
avahi_simple_poll_quit(mc.simple_poll);
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1389
perror_plus("clock_gettime");
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1407
873
int main(int argc, char *argv[]){
1408
874
AvahiSServiceBrowser *sb = NULL;
1411
877
intmax_t tmpmax;
1413
879
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
880
const char *interface = "eth0";
1415
881
struct ifreq network;
1417
bool take_down_interface = false;
885
char *connect_to = NULL;
1420
886
char tempdir[] = "/tmp/mandosXXXXXX";
1421
887
bool tempdir_created = false;
1422
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
889
const char *seckey = PATHDIR "/" SECKEY;
1424
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" };
1426
895
bool gnutls_initialized = false;
1427
896
bool gpgme_initialized = false;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
1432
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1433
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1438
/* Lower any group privileges we might have, just to be safe */
1442
perror_plus("setgid");
1445
/* Lower user privileges (temporarily) */
1449
perror_plus("seteuid");
1457
900
struct argp_option options[] = {
1539
964
mc.priority = arg;
1541
966
case 131: /* --delay */
1543
delay = strtof(arg, &tmp);
1544
if(errno != 0 or tmp == arg or *tmp != '\0'){
1545
argp_error(state, "Bad delay");
1547
case 132: /* --retry */
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1556
case 133: /* --network-hook-dir */
1560
* These reproduce what we would get without ARGP_NO_HELP
1562
case '?': /* --help */
1563
argp_state_help(state, state->out_stream,
1564
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1565
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1566
case -3: /* --usage */
1567
argp_state_help(state, state->out_stream,
1568
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
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");
1575
978
return ARGP_ERR_UNKNOWN;
1580
983
struct argp argp = { .options = options, .parser = parse_opt,
1582
985
.doc = "Mandos client -- Get and decrypt"
1583
986
" passwords from a Mandos server" };
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1592
perror_plus("argp_parse");
1593
exitcode = EX_OSERR;
1596
exitcode = EX_USAGE;
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1606
/* Re-raise priviliges */
1610
perror_plus("seteuid");
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
perror_plus("fstat");
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1625
perror_plus("fchown");
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
perror_plus("fstat");
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1645
perror_plus("fchown");
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1653
/* Lower privileges */
1657
perror_plus("seteuid");
1661
/* Find network hooks and run them */
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1668
perror_plus("scandir");
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1676
perror_plus("asprintf");
1679
pid_t hook_pid = fork();
1682
dup2(devnull, STDIN_FILENO);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1687
perror_plus("setenv");
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1692
perror_plus("setenv");
1695
ret = setenv("MODE", "start", 1);
1697
perror_plus("setenv");
1701
ret = asprintf(&delaystring, "%f", delay);
1703
perror_plus("asprintf");
1706
ret = setenv("DELAY", delaystring, 1);
1709
perror_plus("setenv");
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1756
avahi_set_log_function(empty_log);
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1765
/* No up interfaces, look for any good interfaces */
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1777
if(interface == NULL){
1778
perror_plus("malloc");
1780
exitcode = EXIT_FAILURE;
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"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");
1788
990
exitcode = EXIT_FAILURE;
1793
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
from the signal handler */
1795
/* Initialize the pseudo-RNG for Avahi */
1796
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1801
exitcode = EX_UNAVAILABLE;
1805
sigemptyset(&sigterm_action.sa_mask);
1806
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1808
perror_plus("sigaddset");
1809
exitcode = EX_OSERR;
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1824
/* Need to check if the handler is SIG_IGN before handling:
1825
| [[info:libc:Initial Signal Actions]] |
1826
| [[info:libc:Basic Signal Handling]] |
1828
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1830
perror_plus("sigaction");
1833
if(old_sigterm_action.sa_handler != SIG_IGN){
1834
ret = sigaction(SIGINT, &sigterm_action, NULL);
1836
perror_plus("sigaction");
1837
exitcode = EX_OSERR;
1841
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1843
perror_plus("sigaction");
1846
if(old_sigterm_action.sa_handler != SIG_IGN){
1847
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1849
perror_plus("sigaction");
1850
exitcode = EX_OSERR;
1854
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1856
perror_plus("sigaction");
1859
if(old_sigterm_action.sa_handler != SIG_IGN){
1860
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1862
perror_plus("sigaction");
1863
exitcode = EX_OSERR;
1868
995
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1882
/* Re-raise priviliges */
1886
perror_plus("seteuid");
996
if(interface[0] != '\0'){
1889
997
#ifdef __linux__
1890
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
999
messages to mess up the prompt */
1892
1000
ret = klogctl(8, NULL, 5);
1893
1001
bool restore_loglevel = true;
1895
1003
restore_loglevel = false;
1896
perror_plus("klogctl");
1898
#endif /* __linux__ */
1900
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1011
exitcode = EXIT_FAILURE;
1904
1012
#ifdef __linux__
1905
1013
if(restore_loglevel){
1906
1014
ret = klogctl(7, NULL, 0);
1908
perror_plus("klogctl");
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1916
perror_plus("seteuid");
1920
1022
strcpy(network.ifr_name, interface);
1921
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1923
perror_plus("ioctl SIOCGIFFLAGS");
1025
perror("ioctl SIOCGIFFLAGS");
1924
1026
#ifdef __linux__
1925
1027
if(restore_loglevel){
1926
1028
ret = klogctl(7, NULL, 0);
1928
perror_plus("klogctl");
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1937
perror_plus("seteuid");
1034
exitcode = EXIT_FAILURE;
1941
1037
if((network.ifr_flags & IFF_UP) == 0){
1942
1038
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1949
1043
#ifdef __linux__
1950
1044
if(restore_loglevel){
1951
1045
ret = klogctl(7, NULL, 0);
1953
perror_plus("klogctl");
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1961
perror_plus("seteuid");
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1054
/* sleep checking until interface is running */
1968
1055
for(int i=0; i < delay * 4; i++){
1969
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1971
perror_plus("ioctl SIOCGIFFLAGS");
1058
perror("ioctl SIOCGIFFLAGS");
1972
1059
} else if(network.ifr_flags & IFF_RUNNING){
1975
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
1063
ret = nanosleep(&sleeptime, NULL);
1977
1064
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1065
perror("nanosleep");
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1985
perror_plus("close");
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1988
1072
#ifdef __linux__
1989
1073
if(restore_loglevel){
1990
1074
/* Restores kernel loglevel to default */
1991
1075
ret = klogctl(7, NULL, 0);
1993
perror_plus("klogctl");
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1999
if(take_down_interface){
2000
/* Lower privileges */
2003
perror_plus("seteuid");
2006
/* Lower privileges permanently */
2009
perror_plus("setuid");
2018
ret = init_gnutls_global(pubkey, seckey);
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2022
exitcode = EX_UNAVAILABLE;
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
2025
1103
gnutls_initialized = true;
2032
1106
if(mkdtemp(tempdir) == NULL){
2033
perror_plus("mkdtemp");
2036
1110
tempdir_created = true;
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2045
exitcode = EX_UNAVAILABLE;
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
2048
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;
2055
1129
if(connect_to != NULL){
2214
1248
if(gpgme_initialized){
2215
1249
gpgme_release(mc.ctx);
2218
/* Cleans up the circular linked list of Mandos servers the client
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2229
/* XXX run network hooks "stop" here */
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2237
perror_plus("seteuid");
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
perror_plus("close");
2254
/* Lower privileges permanently */
2258
perror_plus("setuid");
2263
/* Removes the GPGME temp directory and all files inside */
1252
/* Removes the temp directory used by GPGME */
2264
1253
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
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'))){
2272
1274
char *fullname = NULL;
2273
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
1276
direntry->d_name);
2276
perror_plus("asprintf");
2279
1281
ret = remove(fullname);
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2284
1286
free(fullname);
2288
/* need to clean even if 0 because man page doesn't specify */
2290
if (numentries == -1){
2291
perror_plus("scandir");
2293
1290
ret = rmdir(tempdir);
2294
1291
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2300
sigemptyset(&old_sigterm_action.sa_mask);
2301
old_sigterm_action.sa_handler = SIG_DFL;
2302
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2303
&old_sigterm_action,
2306
perror_plus("sigaction");
2309
ret = raise(signal_received);
2310
} while(ret != 0 and errno == EINTR);
2312
perror_plus("raise");
2315
TEMP_FAILURE_RETRY(pause());
2318
1296
return exitcode;