72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
92
80
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
96
84
/* All Avahi types, constants and functions
250
164
* Helper function to insert pub and seckey to the engine keyring.
252
166
bool import_key(const char *filename){
255
168
gpgme_data_t pgp_data;
257
170
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
263
176
rc = gpgme_data_new_from_fd(&pgp_data, fd);
264
177
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));
178
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
270
183
rc = gpgme_op_import(mc.ctx, pgp_data);
271
184
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
185
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
186
gpgme_strsource(rc), gpgme_strerror(rc));
277
190
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
perror_plus("close");
281
194
gpgme_data_release(pgp_data);
286
fprintf_plus(stderr, "Initializing GPGME\n");
199
fprintf(stderr, "Initialize gpgme\n");
290
203
gpgme_check_version(NULL);
291
204
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
292
205
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));
206
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
298
/* Set GPGME home directory for the OpenPGP engine only */
211
/* Set GPGME home directory for the OpenPGP engine only */
299
212
rc = gpgme_get_engine_info(&engine_info);
300
213
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));
214
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
305
218
while(engine_info != NULL){
373
283
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
374
284
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
285
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
377
287
plaintext_length = -1;
379
289
gpgme_decrypt_result_t result;
380
290
result = gpgme_op_decrypt_result(mc.ctx);
381
291
if(result == NULL){
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
292
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);
294
fprintf(stderr, "Unsupported algorithm: %s\n",
295
result->unsupported_algorithm);
296
fprintf(stderr, "Wrong key usage: %u\n",
297
result->wrong_key_usage);
388
298
if(result->file_name != NULL){
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
299
fprintf(stderr, "File name: %s\n", result->file_name);
391
301
gpgme_recipient_t recipient;
392
302
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;
304
while(recipient != NULL){
305
fprintf(stderr, "Public key algorithm: %s\n",
306
gpgme_pubkey_algo_name(recipient->pubkey_algo));
307
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
308
fprintf(stderr, "Secret key available: %s\n",
309
recipient->status == GPG_ERR_NO_SECKEY
311
recipient = recipient->next;
500
411
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
412
gnutls_certificate_allocate_credentials(&mc.cred);
502
413
if(ret != GNUTLS_E_SUCCESS){
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
414
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
418
safer_gnutls_strerror(ret));
505
419
gnutls_global_deinit();
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
424
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
425
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
516
429
ret = gnutls_certificate_set_openpgp_key_file
517
430
(mc.cred, pubkeyfilename, seckeyfilename,
518
431
GNUTLS_OPENPGP_FMT_BASE64);
519
432
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));
434
"Error[%d] while reading the OpenPGP key pair ('%s',"
435
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
436
fprintf(stderr, "The GnuTLS error is: %s\n",
437
safer_gnutls_strerror(ret));
528
441
/* GnuTLS server initialization */
529
442
ret = gnutls_dh_params_init(&mc.dh_params);
530
443
if(ret != GNUTLS_E_SUCCESS){
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
444
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
445
" %s\n", safer_gnutls_strerror(ret));
536
448
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
449
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
450
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
451
safer_gnutls_strerror(ret));
555
467
static int init_gnutls_session(gnutls_session_t *session){
557
469
/* GnuTLS session creation */
559
ret = gnutls_init(session, GNUTLS_SERVER);
563
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
ret = gnutls_init(session, GNUTLS_SERVER);
564
471
if(ret != GNUTLS_E_SUCCESS){
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
472
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
473
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);
478
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
579
479
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));
480
fprintf(stderr, "Syntax error at: %s\n", err);
481
fprintf(stderr, "GnuTLS error: %s\n",
482
safer_gnutls_strerror(ret));
583
483
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);
488
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
490
if(ret != GNUTLS_E_SUCCESS){
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
492
safer_gnutls_strerror(ret));
599
493
gnutls_deinit(*session);
603
497
/* ignore client certificate if any. */
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
498
gnutls_certificate_server_set_request(*session,
606
501
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
1085
863
case AVAHI_BROWSER_ALL_FOR_NOW:
1086
864
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
fprintf_plus(stderr, "No Mandos server found, still"
866
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;
872
static void handle_sigterm(__attribute__((unused)) int sig){
1102
873
int old_errno = errno;
1103
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
874
avahi_simple_poll_quit(mc.simple_poll);
1107
875
errno = old_errno;
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
perror_plus("socket");
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1122
perror_plus("ioctl SIOCGIFFLAGS");
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1139
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1147
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
/* Accept this device */
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1182
if(not get_flags(if_entry->d_name, &ifr)){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1190
if(not good_flags(if_entry->d_name, &ifr)){
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1207
if(not get_flags(if_entry->d_name, &ifr)){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if(not good_flags(if_entry->d_name, &ifr)){
1239
int notdotentries(const struct dirent *direntry){
1240
/* Skip "." and ".." */
1241
if(direntry->d_name[0] == '.'
1242
and (direntry->d_name[1] == '\0'
1243
or (direntry->d_name[1] == '.'
1244
and direntry->d_name[2] == '\0'))){
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1256
if((direntry->d_name)[0] == '\0'){
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
perror_plus("asprintf");
1281
ret = stat(fullname, &st);
1284
perror_plus("Could not stat hook");
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
struct timespec now;
1314
struct timespec waited_time;
1315
intmax_t block_time;
1318
if(mc.current_server == NULL){
1320
fprintf_plus(stderr, "Wait until first server is found."
1323
ret = avahi_simple_poll_iterate(s, -1);
1326
fprintf_plus(stderr, "Check current_server if we should run"
1329
/* the current time */
1330
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
perror_plus("clock_gettime");
1335
/* Calculating in ms how long time between now and server
1336
who we visted longest time ago. Now - last seen. */
1337
waited_time.tv_sec = (now.tv_sec
1338
- mc.current_server->last_seen.tv_sec);
1339
waited_time.tv_nsec = (now.tv_nsec
1340
- mc.current_server->last_seen.tv_nsec);
1341
/* total time is 10s/10,000ms.
1342
Converting to s from ms by dividing by 1,000,
1343
and ns to ms by dividing by 1,000,000. */
1344
block_time = ((retry_interval
1345
- ((intmax_t)waited_time.tv_sec * 1000))
1346
- ((intmax_t)waited_time.tv_nsec / 1000000));
1349
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1353
if(block_time <= 0){
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1359
avahi_simple_poll_quit(mc.simple_poll);
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1363
&mc.current_server->last_seen);
1365
perror_plus("clock_gettime");
1368
mc.current_server = mc.current_server->next;
1369
block_time = 0; /* Call avahi to find new Mandos
1370
servers, but don't block */
1373
ret = avahi_simple_poll_iterate(s, (int)block_time);
1376
if (ret > 0 or errno != EINTR){
1377
return (ret != 1) ? ret : 0;
1383
bool run_network_hooks(const char *mode, const char *interface,
1385
struct dirent **direntries;
1386
struct dirent *direntry;
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1391
perror_plus("scandir");
1393
int devnull = open("/dev/null", O_RDONLY);
1394
for(int i = 0; i < numhooks; i++){
1395
direntry = direntries[i];
1396
char *fullname = NULL;
1397
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
perror_plus("asprintf");
1403
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1406
pid_t hook_pid = fork();
1409
dup2(devnull, STDIN_FILENO);
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1414
perror_plus("setenv");
1417
ret = setenv("DEVICE", interface, 1);
1419
perror_plus("setenv");
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1424
perror_plus("setenv");
1427
ret = setenv("MODE", mode, 1);
1429
perror_plus("setenv");
1433
ret = asprintf(&delaystring, "%f", delay);
1435
perror_plus("asprintf");
1438
ret = setenv("DELAY", delaystring, 1);
1441
perror_plus("setenv");
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1450
perror_plus("waitpid");
1454
if(WIFEXITED(status)){
1455
if(WEXITSTATUS(status) != 0){
1456
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1457
" with status %d\n", direntry->d_name,
1458
WEXITSTATUS(status));
1462
} else if(WIFSIGNALED(status)){
1463
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1464
" signal %d\n", direntry->d_name,
1469
fprintf_plus(stderr, "Warning: network hook \"%s\""
1470
" crashed\n", direntry->d_name);
1477
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1486
878
int main(int argc, char *argv[]){
1487
879
AvahiSServiceBrowser *sb = NULL;
1490
882
intmax_t tmpmax;
1492
884
int exitcode = EXIT_SUCCESS;
1493
const char *interface = "";
885
const char *interface = "eth0";
1494
886
struct ifreq network;
1496
bool take_down_interface = false;
890
char *connect_to = NULL;
1499
891
char tempdir[] = "/tmp/mandosXXXXXX";
1500
892
bool tempdir_created = false;
1501
893
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1618
974
mc.priority = arg;
1620
976
case 131: /* --delay */
1622
delay = strtof(arg, &tmp);
1623
if(errno != 0 or tmp == arg or *tmp != '\0'){
1624
argp_error(state, "Bad delay");
1626
case 132: /* --retry */
1628
retry_interval = strtod(arg, &tmp);
1629
if(errno != 0 or tmp == arg or *tmp != '\0'
1630
or (retry_interval * 1000) > INT_MAX
1631
or retry_interval < 0){
1632
argp_error(state, "Bad retry interval");
1635
case 133: /* --network-hook-dir */
1639
* These reproduce what we would get without ARGP_NO_HELP
1641
case '?': /* --help */
1642
argp_state_help(state, state->out_stream,
1643
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1644
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1645
case -3: /* --usage */
1646
argp_state_help(state, state->out_stream,
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1648
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1652
exit(argp_err_exit_status);
977
ret = sscanf(arg, "%lf%n", &delay, &numchars);
978
if(ret < 1 or arg[numchars] != '\0'){
979
fprintf(stderr, "Bad delay\n");
1655
988
return ARGP_ERR_UNKNOWN;
1660
993
struct argp argp = { .options = options, .parser = parse_opt,
1662
995
.doc = "Mandos client -- Get and decrypt"
1663
996
" passwords from a Mandos server" };
1664
ret = argp_parse(&argp, argc, argv,
1665
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1672
perror_plus("argp_parse");
1673
exitcode = EX_OSERR;
1676
exitcode = EX_USAGE;
1682
/* Work around Debian bug #633582:
1683
<http://bugs.debian.org/633582> */
1686
/* Re-raise priviliges */
1690
perror_plus("seteuid");
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1700
perror_plus("fstat");
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1706
perror_plus("fchown");
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1721
perror_plus("fstat");
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1727
perror_plus("fchown");
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1735
/* Lower privileges */
1739
perror_plus("seteuid");
1743
/* Run network hooks */
1746
/* Re-raise priviliges */
1750
perror_plus("seteuid");
1753
if(not run_network_hooks("start", interface, delay)){
1757
/* Lower privileges */
1761
perror_plus("seteuid");
1767
avahi_set_log_function(empty_log);
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1776
/* No up interfaces, look for any good interfaces */
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1787
if(interface == NULL){
1788
perror_plus("malloc");
1790
exitcode = EXIT_FAILURE;
1796
fprintf_plus(stderr, "Could not find a network interface\n");
997
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
998
if(ret == ARGP_ERR_UNKNOWN){
999
fprintf(stderr, "Unknown error while parsing arguments\n");
1797
1000
exitcode = EXIT_FAILURE;
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1803
from the signal handler */
1804
/* Initialize the pseudo-RNG for Avahi */
1805
srand((unsigned int) time(NULL));
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
1808
fprintf_plus(stderr,
1809
"Avahi: Failed to create simple poll object.\n");
1810
exitcode = EX_UNAVAILABLE;
1814
sigemptyset(&sigterm_action.sa_mask);
1815
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1817
perror_plus("sigaddset");
1818
exitcode = EX_OSERR;
1821
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1823
perror_plus("sigaddset");
1824
exitcode = EX_OSERR;
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1833
/* Need to check if the handler is SIG_IGN before handling:
1834
| [[info:libc:Initial Signal Actions]] |
1835
| [[info:libc:Basic Signal Handling]] |
1837
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1839
perror_plus("sigaction");
1842
if(old_sigterm_action.sa_handler != SIG_IGN){
1843
ret = sigaction(SIGINT, &sigterm_action, NULL);
1845
perror_plus("sigaction");
1846
exitcode = EX_OSERR;
1850
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1852
perror_plus("sigaction");
1855
if(old_sigterm_action.sa_handler != SIG_IGN){
1856
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1858
perror_plus("sigaction");
1859
exitcode = EX_OSERR;
1863
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1865
perror_plus("sigaction");
1868
if(old_sigterm_action.sa_handler != SIG_IGN){
1869
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1871
perror_plus("sigaction");
1872
exitcode = EX_OSERR;
1877
1005
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1890
/* Re-raise priviliges */
1894
perror_plus("seteuid");
1006
if(interface[0] != '\0'){
1897
1007
#ifdef __linux__
1898
1008
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1009
messages to mess up the prompt */
1900
1010
ret = klogctl(8, NULL, 5);
1901
1011
bool restore_loglevel = true;
1903
1013
restore_loglevel = false;
1904
perror_plus("klogctl");
1906
#endif /* __linux__ */
1908
1018
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1021
exitcode = EXIT_FAILURE;
1912
1022
#ifdef __linux__
1913
1023
if(restore_loglevel){
1914
1024
ret = klogctl(7, NULL, 0);
1916
perror_plus("klogctl");
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1924
perror_plus("seteuid");
1928
1032
strcpy(network.ifr_name, interface);
1929
1033
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1931
perror_plus("ioctl SIOCGIFFLAGS");
1035
perror("ioctl SIOCGIFFLAGS");
1932
1036
#ifdef __linux__
1933
1037
if(restore_loglevel){
1934
1038
ret = klogctl(7, NULL, 0);
1936
perror_plus("klogctl");
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1945
perror_plus("seteuid");
1044
exitcode = EXIT_FAILURE;
1949
1047
if((network.ifr_flags & IFF_UP) == 0){
1950
1048
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
1049
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1051
perror("ioctl SIOCSIFFLAGS");
1052
exitcode = EXIT_FAILURE;
1957
1053
#ifdef __linux__
1958
1054
if(restore_loglevel){
1959
1055
ret = klogctl(7, NULL, 0);
1961
perror_plus("klogctl");
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1969
perror_plus("seteuid");
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1064
/* sleep checking until interface is running */
1976
1065
for(int i=0; i < delay * 4; i++){
1977
1066
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1979
perror_plus("ioctl SIOCGIFFLAGS");
1068
perror("ioctl SIOCGIFFLAGS");
1980
1069
} else if(network.ifr_flags & IFF_RUNNING){
1983
1072
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
1073
ret = nanosleep(&sleeptime, NULL);
1985
1074
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1075
perror("nanosleep");
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1993
perror_plus("close");
1078
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1996
1082
#ifdef __linux__
1997
1083
if(restore_loglevel){
1998
1084
/* Restores kernel loglevel to default */
1999
1085
ret = klogctl(7, NULL, 0);
2001
perror_plus("klogctl");
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2007
/* Lower privileges */
2010
perror_plus("seteuid");
2018
1107
ret = init_gnutls_global(pubkey, seckey);
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2021
exitcode = EX_UNAVAILABLE;
1109
fprintf(stderr, "init_gnutls_global failed\n");
1110
exitcode = EXIT_FAILURE;
2024
1113
gnutls_initialized = true;
2031
1116
if(mkdtemp(tempdir) == NULL){
2032
perror_plus("mkdtemp");
2035
1120
tempdir_created = true;
2041
1122
if(not init_gpgme(pubkey, seckey, tempdir)){
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2043
exitcode = EX_UNAVAILABLE;
1123
fprintf(stderr, "init_gpgme failed\n");
1124
exitcode = EXIT_FAILURE;
2046
1127
gpgme_initialized = true;
1130
if(interface[0] != '\0'){
1131
if_index = (AvahiIfIndex) if_nametoindex(interface);
1133
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1134
exitcode = EXIT_FAILURE;
2053
1139
if(connect_to != NULL){
2055
1141
/* (Mainly meant for debugging) */
2056
1142
char *address = strrchr(connect_to, ':');
2057
1143
if(address == NULL){
2058
fprintf_plus(stderr, "No colon in address\n");
2059
exitcode = EX_USAGE;
1144
fprintf(stderr, "No colon in address\n");
1145
exitcode = EXIT_FAILURE;
2069
tmpmax = strtoimax(address+1, &tmp, 10);
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2071
or tmpmax != (uint16_t)tmpmax){
2072
fprintf_plus(stderr, "Bad port number\n");
2073
exitcode = EX_USAGE;
1149
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1150
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1151
or address[numchars+1] != '\0'){
1152
fprintf(stderr, "Bad port number\n");
1153
exitcode = EXIT_FAILURE;
2081
1156
port = (uint16_t)tmpmax;
2082
1157
*address = '\0';
1158
address = connect_to;
2083
1159
/* Colon in address indicates IPv6 */
2085
if(strchr(connect_to, ':') != NULL){
1161
if(strchr(address, ':') != NULL){
2087
/* Accept [] around IPv6 address - see RFC 5952 */
2088
if(connect_to[0] == '[' and address[-1] == ']')
2096
address = connect_to;
2102
while(not quit_now){
2103
ret = start_mandos_communication(address, port, if_index, af);
2104
if(quit_now or ret == 0){
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2109
(int)retry_interval);
2111
sleep((int)retry_interval);
1166
ret = start_mandos_communication(address, port, if_index,
1169
exitcode = EXIT_FAILURE;
2115
1171
exitcode = EXIT_SUCCESS;
1177
avahi_set_log_function(empty_log);
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;
2143
1209
/* Check if creating the Avahi server object succeeded */
2144
1210
if(mc.server == NULL){
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2146
avahi_strerror(error));
2147
exitcode = EX_UNAVAILABLE;
1211
fprintf(stderr, "Failed to create Avahi server: %s\n",
1212
avahi_strerror(error));
1213
exitcode = EXIT_FAILURE;
2155
1217
/* Create the Avahi service browser */
2156
1218
sb = avahi_s_service_browser_new(mc.server, if_index,
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
2158
1220
NULL, 0, browse_callback, NULL);
2159
1221
if(sb == NULL){
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2161
avahi_strerror(avahi_server_errno(mc.server)));
2162
exitcode = EX_UNAVAILABLE;
1222
fprintf(stderr, "Failed to create service browser: %s\n",
1223
avahi_strerror(avahi_server_errno(mc.server)));
1224
exitcode = EXIT_FAILURE;
1228
sigemptyset(&sigterm_action.sa_mask);
1229
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1231
perror("sigaddset");
1232
exitcode = EXIT_FAILURE;
1235
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1237
perror("sigaction");
1238
exitcode = EXIT_FAILURE;
2170
1242
/* Run the main loop */
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2180
(ret == 0) ? "successfully" : "with error");
1245
fprintf(stderr, "Starting Avahi loop search\n");
1248
avahi_simple_poll_loop(mc.simple_poll);
2186
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1253
fprintf(stderr, "%s exiting\n", argv[0]);
2189
1256
/* Cleanup things */
2206
1273
gpgme_release(mc.ctx);
2209
/* Cleans up the circular linked list of Mandos servers the client
2211
if(mc.current_server != NULL){
2212
mc.current_server->prev->next = NULL;
2213
while(mc.current_server != NULL){
2214
server *next = mc.current_server->next;
2215
free(mc.current_server);
2216
mc.current_server = next;
2220
/* Re-raise priviliges */
2226
perror_plus("seteuid");
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2247
perror_plus("close");
2252
/* Lower privileges permanently */
2256
perror_plus("setuid");
2260
/* Removes the GPGME temp directory and all files inside */
1276
/* Removes the temp directory used by GPGME */
2261
1277
if(tempdir_created){
2262
struct dirent **direntries = NULL;
2263
struct dirent *direntry = NULL;
2264
int numentries = scandir(tempdir, &direntries, notdotentries,
2266
if (numentries > 0){
2267
for(int i = 0; i < numentries; i++){
2268
direntry = direntries[i];
1279
struct dirent *direntry;
1280
d = opendir(tempdir);
1282
if(errno != ENOENT){
1287
direntry = readdir(d);
1288
if(direntry == NULL){
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
2269
1298
char *fullname = NULL;
2270
1299
ret = asprintf(&fullname, "%s/%s", tempdir,
2271
1300
direntry->d_name);
2273
perror_plus("asprintf");
2276
1305
ret = remove(fullname);
2278
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2281
1310
free(fullname);
2285
/* need to clean even if 0 because man page doesn't specify */
2287
if (numentries == -1){
2288
perror_plus("scandir");
2290
1314
ret = rmdir(tempdir);
2291
1315
if(ret == -1 and errno != ENOENT){
2292
perror_plus("rmdir");
2297
sigemptyset(&old_sigterm_action.sa_mask);
2298
old_sigterm_action.sa_handler = SIG_DFL;
2299
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2300
&old_sigterm_action,
2303
perror_plus("sigaction");
2306
ret = raise(signal_received);
2307
} while(ret != 0 and errno == EINTR);
2309
perror_plus("raise");
2312
TEMP_FAILURE_RETRY(pause());
2315
1320
return exitcode;