167
249
* Helper function to insert pub and seckey to the engine keyring.
169
251
bool import_key(const char *filename){
171
254
gpgme_data_t pgp_data;
173
256
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
179
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
180
263
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
182
266
gpgme_strsource(rc), gpgme_strerror(rc));
186
270
rc = gpgme_op_import(mc.ctx, pgp_data);
187
271
if(rc != GPG_ERR_NO_ERROR){
188
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
189
274
gpgme_strsource(rc), gpgme_strerror(rc));
193
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
perror_plus("close");
197
282
gpgme_data_release(pgp_data);
202
fprintf(stderr, "Initializing GPGME\n");
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
206
292
gpgme_check_version(NULL);
207
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
208
294
if(rc != GPG_ERR_NO_ERROR){
209
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
210
297
gpgme_strsource(rc), gpgme_strerror(rc));
214
/* Set GPGME home directory for the OpenPGP engine only */
301
/* Set GPGME home directory for the OpenPGP engine only */
215
302
rc = gpgme_get_engine_info(&engine_info);
216
303
if(rc != GPG_ERR_NO_ERROR){
217
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
218
306
gpgme_strsource(rc), gpgme_strerror(rc));
286
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
287
380
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
289
383
gpgme_strsource(rc), gpgme_strerror(rc));
290
384
plaintext_length = -1;
292
386
gpgme_decrypt_result_t result;
293
387
result = gpgme_op_decrypt_result(mc.ctx);
294
388
if(result == NULL){
295
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
297
fprintf(stderr, "Unsupported algorithm: %s\n",
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
298
394
result->unsupported_algorithm);
299
fprintf(stderr, "Wrong key usage: %u\n",
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
300
397
result->wrong_key_usage);
301
398
if(result->file_name != NULL){
302
fprintf(stderr, "File name: %s\n", result->file_name);
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
304
402
gpgme_recipient_t recipient;
305
403
recipient = result->recipients;
307
while(recipient != NULL){
308
fprintf(stderr, "Public key algorithm: %s\n",
309
gpgme_pubkey_algo_name(recipient->pubkey_algo));
310
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
311
fprintf(stderr, "Secret key available: %s\n",
312
recipient->status == GPG_ERR_NO_SECKEY
314
recipient = recipient->next;
404
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
412
recipient->status == GPG_ERR_NO_SECKEY
414
recipient = recipient->next;
470
573
static int init_gnutls_session(gnutls_session_t *session){
472
575
/* GnuTLS session creation */
473
ret = gnutls_init(session, GNUTLS_SERVER);
577
ret = gnutls_init(session, GNUTLS_SERVER);
581
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
474
582
if(ret != GNUTLS_E_SUCCESS){
475
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
476
585
safer_gnutls_strerror(ret));
481
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
593
gnutls_deinit(*session);
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
482
597
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "Syntax error at: %s\n", err);
484
fprintf(stderr, "GnuTLS error: %s\n",
485
safer_gnutls_strerror(ret));
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
486
602
gnutls_deinit(*session);
491
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
608
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
611
gnutls_deinit(*session);
614
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
615
if(ret != GNUTLS_E_SUCCESS){
494
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
495
618
safer_gnutls_strerror(ret));
496
619
gnutls_deinit(*session);
500
623
/* ignore client certificate if any. */
501
gnutls_certificate_server_set_request(*session,
624
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
504
626
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
866
1118
case AVAHI_BROWSER_ALL_FOR_NOW:
867
1119
case AVAHI_BROWSER_CACHE_EXHAUSTED:
869
fprintf(stderr, "No Mandos server found, still searching...\n");
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
875
sig_atomic_t quit_now = 0;
877
static void handle_sigterm(__attribute__((unused)) int sig){
1128
/* Signal handler that stops main loop after SIGTERM */
1129
static void handle_sigterm(int sig){
1134
signal_received = sig;
882
1135
int old_errno = errno;
1136
/* set main loop to exit */
883
1137
if(mc.simple_poll != NULL){
884
1138
avahi_simple_poll_quit(mc.simple_poll);
886
1140
errno = old_errno;
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1148
perror_plus("socket");
1151
strcpy(ifr->ifr_name, ifname);
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1155
perror_plus("ioctl SIOCGIFFLAGS");
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1164
/* Reject the loopback device */
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1172
/* Accept point-to-point devices only if connect_to is specified */
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1180
/* Otherwise, reject non-broadcast-capable devices */
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
if(ifr->ifr_flags & IFF_NOARP){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1197
/* Accept this device */
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1206
* This function determines if a directory entry in /sys/class/net
1207
* corresponds to an acceptable network device.
1208
* (This function is passed to scandir(3) as a filter function.)
1210
int good_interface(const struct dirent *if_entry){
1211
if(if_entry->d_name[0] == '.'){
1216
if(not get_flags(if_entry->d_name, &ifr)){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1225
if(not good_flags(if_entry->d_name, &ifr)){
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1242
if(not get_flags(if_entry->d_name, &ifr)){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1271
if(not good_flags(if_entry->d_name, &ifr)){
1277
int notdotentries(const struct dirent *direntry){
1278
/* Skip "." and ".." */
1279
if(direntry->d_name[0] == '.'
1280
and (direntry->d_name[1] == '\0'
1281
or (direntry->d_name[1] == '.'
1282
and direntry->d_name[2] == '\0'))){
1288
/* Is this directory entry a runnable program? */
1289
int runnable_hook(const struct dirent *direntry){
1294
if((direntry->d_name)[0] == '\0'){
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
"abcdefghijklmnopqrstuvwxyz"
1303
if((direntry->d_name)[sret] != '\0'){
1304
/* Contains non-allowed characters */
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1316
perror_plus("asprintf");
1320
ret = stat(fullname, &st);
1323
perror_plus("Could not stat hook");
1327
if(not (S_ISREG(st.st_mode))){
1328
/* Not a regular file */
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
/* Not executable */
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1350
struct timespec now;
1351
struct timespec waited_time;
1352
intmax_t block_time;
1355
if(mc.current_server == NULL){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1360
ret = avahi_simple_poll_iterate(s, -1);
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1367
/* the current time */
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1370
perror_plus("clock_gettime");
1373
/* Calculating in ms how long time between now and server
1374
who we visted longest time ago. Now - last seen. */
1375
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1377
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1379
/* total time is 10s/10,000ms.
1380
Converting to s from ms by dividing by 1,000,
1381
and ns to ms by dividing by 1,000,000. */
1382
block_time = ((retry_interval
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1391
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1397
avahi_simple_poll_quit(mc.simple_poll);
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1403
perror_plus("clock_gettime");
1406
mc.current_server = mc.current_server->next;
1407
block_time = 0; /* Call avahi to find new Mandos
1408
servers, but don't block */
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1414
if (ret > 0 or errno != EINTR){
1415
return (ret != 1) ? ret : 0;
889
1421
int main(int argc, char *argv[]){
890
1422
AvahiSServiceBrowser *sb = NULL;
893
1425
intmax_t tmpmax;
895
1427
int exitcode = EXIT_SUCCESS;
896
const char *interface = "eth0";
1428
const char *interface = "";
897
1429
struct ifreq network;
1431
bool take_down_interface = false;
901
char *connect_to = NULL;
902
1434
char tempdir[] = "/tmp/mandosXXXXXX";
903
1435
bool tempdir_created = false;
904
1436
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
905
1437
const char *seckey = PATHDIR "/" SECKEY;
906
1438
const char *pubkey = PATHDIR "/" PUBKEY;
908
/* Initialize Mandos context */
909
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
910
.dh_bits = 1024, .priority = "SECURE256"
911
":!CTYPE-X.509:+CTYPE-OPENPGP" };
912
1440
bool gnutls_initialized = false;
913
1441
bool gpgme_initialized = false;
916
struct sigaction old_sigterm_action;
1443
double retry_interval = 10; /* 10s between trying a server and
1444
retrying the same server again */
1446
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
917
1447
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1452
/* Lower any group privileges we might have, just to be safe */
1456
perror_plus("setgid");
1459
/* Lower user privileges (temporarily) */
1463
perror_plus("seteuid");
920
1471
struct argp_option options[] = {
921
1472
{ .name = "debug", .key = 128,
984
1553
mc.priority = arg;
986
1555
case 131: /* --delay */
987
ret = sscanf(arg, "%lf%n", &delay, &numchars);
988
if(ret < 1 or arg[numchars] != '\0'){
989
fprintf(stderr, "Bad delay\n");
1557
delay = strtof(arg, &tmp);
1558
if(errno != 0 or tmp == arg or *tmp != '\0'){
1559
argp_error(state, "Bad delay");
1561
case 132: /* --retry */
1563
retry_interval = strtod(arg, &tmp);
1564
if(errno != 0 or tmp == arg or *tmp != '\0'
1565
or (retry_interval * 1000) > INT_MAX
1566
or retry_interval < 0){
1567
argp_error(state, "Bad retry interval");
1570
case 133: /* --network-hook-dir */
1574
* These reproduce what we would get without ARGP_NO_HELP
1576
case '?': /* --help */
1577
argp_state_help(state, state->out_stream,
1578
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1579
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1580
case -3: /* --usage */
1581
argp_state_help(state, state->out_stream,
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
1586
exit(argp_err_exit_status);
998
1589
return ARGP_ERR_UNKNOWN;
1003
1594
struct argp argp = { .options = options, .parser = parse_opt,
1004
1595
.args_doc = "",
1005
1596
.doc = "Mandos client -- Get and decrypt"
1006
1597
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1598
ret = argp_parse(&argp, argc, argv,
1599
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1606
perror_plus("argp_parse");
1607
exitcode = EX_OSERR;
1610
exitcode = EX_USAGE;
1616
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
1620
/* Re-raise priviliges */
1624
perror_plus("seteuid");
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1634
perror_plus("fstat");
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1639
perror_plus("fchown");
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1654
perror_plus("fstat");
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1659
perror_plus("fchown");
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1667
/* Lower privileges */
1671
perror_plus("seteuid");
1675
/* Find network hooks and run them */
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1682
perror_plus("scandir");
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1690
perror_plus("asprintf");
1693
pid_t hook_pid = fork();
1696
dup2(devnull, STDIN_FILENO);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1701
perror_plus("setenv");
1704
ret = setenv("DEVICE", interface, 1);
1706
perror_plus("setenv");
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1711
perror_plus("setenv");
1714
ret = setenv("MODE", "start", 1);
1716
perror_plus("setenv");
1720
ret = asprintf(&delaystring, "%f", delay);
1722
perror_plus("asprintf");
1725
ret = setenv("DELAY", delaystring, 1);
1728
perror_plus("setenv");
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1775
avahi_set_log_function(empty_log);
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1784
/* No up interfaces, look for any good interfaces */
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1796
if(interface == NULL){
1797
perror_plus("malloc");
1799
exitcode = EXIT_FAILURE;
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1010
1807
exitcode = EXIT_FAILURE;
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
from the signal handler */
1814
/* Initialize the pseudo-RNG for Avahi */
1815
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1824
sigemptyset(&sigterm_action.sa_mask);
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1849
perror_plus("sigaction");
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1862
perror_plus("sigaction");
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1875
perror_plus("sigaction");
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1015
1887
/* If the interface is down, bring it up */
1016
if(interface[0] != '\0'){
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1901
/* Re-raise priviliges */
1905
perror_plus("seteuid");
1017
1908
#ifdef __linux__
1018
1909
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1019
messages to mess up the prompt */
1910
messages about the network interface to mess up the prompt */
1020
1911
ret = klogctl(8, NULL, 5);
1021
1912
bool restore_loglevel = true;
1023
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1026
1917
#endif /* __linux__ */
1028
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1031
exitcode = EXIT_FAILURE;
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1032
1923
#ifdef __linux__
1033
1924
if(restore_loglevel){
1034
1925
ret = klogctl(7, NULL, 0);
1927
perror_plus("klogctl");
1039
1930
#endif /* __linux__ */
1931
/* Lower privileges */
1935
perror_plus("seteuid");
1042
1939
strcpy(network.ifr_name, interface);
1043
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1045
perror("ioctl SIOCGIFFLAGS");
1942
perror_plus("ioctl SIOCGIFFLAGS");
1046
1943
#ifdef __linux__
1047
1944
if(restore_loglevel){
1048
1945
ret = klogctl(7, NULL, 0);
1947
perror_plus("klogctl");
1053
1950
#endif /* __linux__ */
1054
exitcode = EXIT_FAILURE;
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1956
perror_plus("seteuid");
1057
1960
if((network.ifr_flags & IFF_UP) == 0){
1058
1961
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1059
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1061
perror("ioctl SIOCSIFFLAGS");
1062
exitcode = EXIT_FAILURE;
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1063
1968
#ifdef __linux__
1064
1969
if(restore_loglevel){
1065
1970
ret = klogctl(7, NULL, 0);
1972
perror_plus("klogctl");
1070
1975
#endif /* __linux__ */
1976
/* Lower privileges */
1980
perror_plus("seteuid");
1074
/* sleep checking until interface is running */
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1075
1987
for(int i=0; i < delay * 4; i++){
1076
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1078
perror("ioctl SIOCGIFFLAGS");
1990
perror_plus("ioctl SIOCGIFFLAGS");
1079
1991
} else if(network.ifr_flags & IFF_RUNNING){
1082
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1083
1995
ret = nanosleep(&sleeptime, NULL);
1084
1996
if(ret == -1 and errno != EINTR){
1085
perror("nanosleep");
1997
perror_plus("nanosleep");
1088
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
perror_plus("close");
1092
2007
#ifdef __linux__
1093
2008
if(restore_loglevel){
1094
2009
/* Restores kernel loglevel to default */
1095
2010
ret = klogctl(7, NULL, 0);
2012
perror_plus("klogctl");
1100
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2018
if(take_down_interface){
2019
/* Lower privileges */
2022
perror_plus("seteuid");
2025
/* Lower privileges permanently */
2028
perror_plus("setuid");
1117
2037
ret = init_gnutls_global(pubkey, seckey);
1119
fprintf(stderr, "init_gnutls_global failed\n");
1120
exitcode = EXIT_FAILURE;
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2041
exitcode = EX_UNAVAILABLE;
1123
2044
gnutls_initialized = true;
1126
2051
if(mkdtemp(tempdir) == NULL){
2052
perror_plus("mkdtemp");
1130
2055
tempdir_created = true;
1132
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
1133
fprintf(stderr, "init_gpgme failed\n");
1134
exitcode = EXIT_FAILURE;
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
1137
2067
gpgme_initialized = true;
1140
if(interface[0] != '\0'){
1141
if_index = (AvahiIfIndex) if_nametoindex(interface);
1143
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1144
exitcode = EXIT_FAILURE;
1149
2074
if(connect_to != NULL){
1218
2166
/* Check if creating the Avahi server object succeeded */
1219
2167
if(mc.server == NULL){
1220
fprintf(stderr, "Failed to create Avahi server: %s\n",
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
1221
2170
avahi_strerror(error));
1222
exitcode = EXIT_FAILURE;
2171
exitcode = EX_UNAVAILABLE;
1226
2179
/* Create the Avahi service browser */
1227
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
1228
AVAHI_PROTO_INET6, "_mandos._tcp",
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1229
2182
NULL, 0, browse_callback, NULL);
1230
2183
if(sb == NULL){
1231
fprintf(stderr, "Failed to create service browser: %s\n",
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
1232
2186
avahi_strerror(avahi_server_errno(mc.server)));
1233
exitcode = EXIT_FAILURE;
2187
exitcode = EX_UNAVAILABLE;
1237
sigemptyset(&sigterm_action.sa_mask);
1238
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1240
perror("sigaddset");
1241
exitcode = EXIT_FAILURE;
1244
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1246
perror("sigaddset");
1247
exitcode = EXIT_FAILURE;
1250
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1252
perror("sigaddset");
1253
exitcode = EXIT_FAILURE;
1256
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1258
perror("sigaction");
1259
exitcode = EXIT_FAILURE;
1263
2195
/* Run the main loop */
1266
fprintf(stderr, "Starting Avahi loop search\n");
1269
avahi_simple_poll_loop(mc.simple_poll);
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
1274
fprintf(stderr, "%s exiting\n", argv[0]);
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
1277
2217
/* Cleanup things */
1293
2233
if(gpgme_initialized){
1294
2234
gpgme_release(mc.ctx);
1297
/* Removes the temp directory used by GPGME */
2237
/* Cleans up the circular linked list of Mandos servers the client
2239
if(mc.current_server != NULL){
2240
mc.current_server->prev->next = NULL;
2241
while(mc.current_server != NULL){
2242
server *next = mc.current_server->next;
2243
free(mc.current_server);
2244
mc.current_server = next;
2248
/* XXX run network hooks "stop" here */
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2256
perror_plus("seteuid");
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
perror_plus("close");
2273
/* Lower privileges permanently */
2277
perror_plus("setuid");
2282
/* Removes the GPGME temp directory and all files inside */
1298
2283
if(tempdir_created){
1300
struct dirent *direntry;
1301
d = opendir(tempdir);
1303
if(errno != ENOENT){
1308
direntry = readdir(d);
1309
if(direntry == NULL){
1312
/* Skip "." and ".." */
1313
if(direntry->d_name[0] == '.'
1314
and (direntry->d_name[1] == '\0'
1315
or (direntry->d_name[1] == '.'
1316
and direntry->d_name[2] == '\0'))){
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
1319
2291
char *fullname = NULL;
1320
2292
ret = asprintf(&fullname, "%s/%s", tempdir,
1321
2293
direntry->d_name);
2295
perror_plus("asprintf");
1326
2298
ret = remove(fullname);
1328
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1331
2303
free(fullname);
2307
/* need to clean even if 0 because man page doesn't specify */
2309
if (numentries == -1){
2310
perror_plus("scandir");
1335
2312
ret = rmdir(tempdir);
1336
2313
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2319
sigemptyset(&old_sigterm_action.sa_mask);
2320
old_sigterm_action.sa_handler = SIG_DFL;
2321
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2322
&old_sigterm_action,
2325
perror_plus("sigaction");
2328
ret = raise(signal_received);
2329
} while(ret != 0 and errno == EINTR);
2331
perror_plus("raise");
2334
TEMP_FAILURE_RETRY(pause());
1341
2337
return exitcode;