67
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
72
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
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() */
90
#include <grp.h> /* setgroups() */
80
93
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
84
97
/* All Avahi types, constants and functions
164
254
* Helper function to insert pub and seckey to the engine keyring.
166
256
bool import_key(const char *filename){
168
259
gpgme_data_t pgp_data;
170
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
177
268
if(rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
183
274
rc = gpgme_op_import(mc.ctx, pgp_data);
184
275
if(rc != GPG_ERR_NO_ERROR){
185
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
186
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
190
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
283
perror_plus("close");
194
285
gpgme_data_release(pgp_data);
199
fprintf(stderr, "Initialize gpgme\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
203
294
gpgme_check_version(NULL);
204
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
205
296
if(rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
211
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
212
303
rc = gpgme_get_engine_info(&engine_info);
213
304
if(rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
218
309
while(engine_info != NULL){
283
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
284
378
if(rc != GPG_ERR_NO_ERROR){
285
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
287
381
plaintext_length = -1;
289
383
gpgme_decrypt_result_t result;
290
384
result = gpgme_op_decrypt_result(mc.ctx);
291
385
if(result == NULL){
292
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
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
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
298
392
if(result->file_name != NULL){
299
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
301
395
gpgme_recipient_t recipient;
302
396
recipient = result->recipients;
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;
397
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
405
recipient = recipient->next;
411
504
/* OpenPGP credentials */
412
gnutls_certificate_allocate_credentials(&mc.cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
413
506
if(ret != GNUTLS_E_SUCCESS){
414
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
418
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
419
509
gnutls_global_deinit();
424
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
425
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
429
520
ret = gnutls_certificate_set_openpgp_key_file
430
521
(mc.cred, pubkeyfilename, seckeyfilename,
431
522
GNUTLS_OPENPGP_FMT_BASE64);
432
523
if(ret != GNUTLS_E_SUCCESS){
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));
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
441
532
/* GnuTLS server initialization */
442
533
ret = gnutls_dh_params_init(&mc.dh_params);
443
534
if(ret != GNUTLS_E_SUCCESS){
444
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
445
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
448
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
449
541
if(ret != GNUTLS_E_SUCCESS){
450
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
451
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
467
559
static int init_gnutls_session(gnutls_session_t *session){
469
561
/* GnuTLS session creation */
470
ret = gnutls_init(session, GNUTLS_SERVER);
563
ret = gnutls_init(session, GNUTLS_SERVER);
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
471
568
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
473
safer_gnutls_strerror(ret));
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
478
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
579
gnutls_deinit(*session);
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
583
if(ret != GNUTLS_E_SUCCESS){
480
fprintf(stderr, "Syntax error at: %s\n", err);
481
fprintf(stderr, "GnuTLS error: %s\n",
482
safer_gnutls_strerror(ret));
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
483
587
gnutls_deinit(*session);
488
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
gnutls_deinit(*session);
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
600
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
492
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
493
603
gnutls_deinit(*session);
497
607
/* ignore client certificate if any. */
498
gnutls_certificate_server_set_request(*session,
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
501
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
863
1095
case AVAHI_BROWSER_ALL_FOR_NOW:
864
1096
case AVAHI_BROWSER_CACHE_EXHAUSTED:
866
fprintf(stderr, "No Mandos server found, still searching...\n");
1098
fprintf_plus(stderr, "No Mandos server found, still"
872
static void handle_sigterm(__attribute__((unused)) int sig){
1105
/* Signal handler that stops main loop after SIGTERM */
1106
static void handle_sigterm(int sig){
1111
signal_received = sig;
873
1112
int old_errno = errno;
874
avahi_simple_poll_quit(mc.simple_poll);
1113
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
875
1117
errno = old_errno;
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1125
perror_plus("socket");
1128
strcpy(ifr->ifr_name, ifname);
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
perror_plus("ioctl SIOCGIFFLAGS");
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1141
/* Reject the loopback device */
1142
if(ifr->ifr_flags & IFF_LOOPBACK){
1144
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1149
/* Accept point-to-point devices only if connect_to is specified */
1150
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1152
fprintf_plus(stderr, "Accepting point-to-point interface"
1153
" \"%s\"\n", ifname);
1157
/* Otherwise, reject non-broadcast-capable devices */
1158
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1160
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1161
" \"%s\"\n", ifname);
1165
/* Reject non-ARP interfaces (including dummy interfaces) */
1166
if(ifr->ifr_flags & IFF_NOARP){
1168
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1174
/* Accept this device */
1176
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1182
* This function determines if a directory entry in /sys/class/net
1183
* corresponds to an acceptable network device.
1184
* (This function is passed to scandir(3) as a filter function.)
1186
int good_interface(const struct dirent *if_entry){
1187
if(if_entry->d_name[0] == '.'){
1192
if(not get_flags(if_entry->d_name, &ifr)){
1194
fprintf_plus(stderr, "Failed to get flags for interface "
1195
"\"%s\"\n", if_entry->d_name);
1200
if(not good_flags(if_entry->d_name, &ifr)){
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1217
if(not get_flags(if_entry->d_name, &ifr)){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1243
if(not good_flags(if_entry->d_name, &ifr)){
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1266
if((direntry->d_name)[0] == '\0'){
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1287
perror_plus("asprintf");
1291
ret = stat(fullname, &st);
1294
perror_plus("Could not stat hook");
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1328
if(mc.current_server == NULL){
1330
fprintf_plus(stderr, "Wait until first server is found."
1333
ret = avahi_simple_poll_iterate(s, -1);
1336
fprintf_plus(stderr, "Check current_server if we should run"
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1342
perror_plus("clock_gettime");
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1369
avahi_simple_poll_quit(mc.simple_poll);
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1375
perror_plus("clock_gettime");
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1393
bool run_network_hooks(const char *mode, const char *interface,
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1401
perror_plus("scandir");
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1409
perror_plus("asprintf");
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1416
pid_t hook_pid = fork();
1419
/* Raise privileges */
1423
perror_plus("seteuid");
1425
/* Raise privileges even more */
1429
perror_plus("setuid");
1435
perror_plus("setgid");
1437
/* Reset supplementary groups */
1439
ret = setgroups(0, NULL);
1441
perror_plus("setgroups");
1443
dup2(devnull, STDIN_FILENO);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1448
perror_plus("setenv");
1451
ret = setenv("DEVICE", interface, 1);
1453
perror_plus("setenv");
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1458
perror_plus("setenv");
1461
ret = setenv("MODE", mode, 1);
1463
perror_plus("setenv");
1467
ret = asprintf(&delaystring, "%f", delay);
1469
perror_plus("asprintf");
1472
ret = setenv("DELAY", delaystring, 1);
1475
perror_plus("setenv");
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1482
perror_plus("setenv");
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
878
1529
int main(int argc, char *argv[]){
879
1530
AvahiSServiceBrowser *sb = NULL;
882
1533
intmax_t tmpmax;
884
1535
int exitcode = EXIT_SUCCESS;
885
const char *interface = "eth0";
1536
const char *interface = "";
886
1537
struct ifreq network;
1539
bool take_down_interface = false;
890
char *connect_to = NULL;
891
1542
char tempdir[] = "/tmp/mandosXXXXXX";
892
1543
bool tempdir_created = false;
893
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
974
1661
mc.priority = arg;
976
1663
case 131: /* --delay */
977
ret = sscanf(arg, "%lf%n", &delay, &numchars);
978
if(ret < 1 or arg[numchars] != '\0'){
979
fprintf(stderr, "Bad delay\n");
1665
delay = strtof(arg, &tmp);
1666
if(errno != 0 or tmp == arg or *tmp != '\0'){
1667
argp_error(state, "Bad delay");
1669
case 132: /* --retry */
1671
retry_interval = strtod(arg, &tmp);
1672
if(errno != 0 or tmp == arg or *tmp != '\0'
1673
or (retry_interval * 1000) > INT_MAX
1674
or retry_interval < 0){
1675
argp_error(state, "Bad retry interval");
1678
case 133: /* --network-hook-dir */
1682
* These reproduce what we would get without ARGP_NO_HELP
1684
case '?': /* --help */
1685
argp_state_help(state, state->out_stream,
1686
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1687
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1688
case -3: /* --usage */
1689
argp_state_help(state, state->out_stream,
1690
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1691
case 'V': /* --version */
1692
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1693
exit(argp_err_exit_status);
988
1696
return ARGP_ERR_UNKNOWN;
993
1701
struct argp argp = { .options = options, .parser = parse_opt,
995
1703
.doc = "Mandos client -- Get and decrypt"
996
1704
" passwords from a Mandos server" };
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");
1705
ret = argp_parse(&argp, argc, argv,
1706
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1713
perror_plus("argp_parse");
1714
exitcode = EX_OSERR;
1717
exitcode = EX_USAGE;
1723
/* Work around Debian bug #633582:
1724
<http://bugs.debian.org/633582> */
1726
/* Re-raise priviliges */
1730
perror_plus("seteuid");
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1735
int seckey_fd = open(seckey, O_RDONLY);
1736
if(seckey_fd == -1){
1737
perror_plus("open");
1739
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1741
perror_plus("fstat");
1743
if(S_ISREG(st.st_mode)
1744
and st.st_uid == 0 and st.st_gid == 0){
1745
ret = fchown(seckey_fd, uid, gid);
1747
perror_plus("fchown");
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
int pubkey_fd = open(pubkey, O_RDONLY);
1757
if(pubkey_fd == -1){
1758
perror_plus("open");
1760
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1762
perror_plus("fstat");
1764
if(S_ISREG(st.st_mode)
1765
and st.st_uid == 0 and st.st_gid == 0){
1766
ret = fchown(pubkey_fd, uid, gid);
1768
perror_plus("fchown");
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1776
/* Lower privileges */
1780
perror_plus("seteuid");
1785
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1791
avahi_set_log_function(empty_log);
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1800
/* No up interfaces, look for any good interfaces */
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1811
if(interface == NULL){
1812
perror_plus("malloc");
1814
exitcode = EXIT_FAILURE;
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1000
1821
exitcode = EXIT_FAILURE;
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
from the signal handler */
1828
/* Initialize the pseudo-RNG for Avahi */
1829
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
1832
fprintf_plus(stderr,
1833
"Avahi: Failed to create simple poll object.\n");
1834
exitcode = EX_UNAVAILABLE;
1838
sigemptyset(&sigterm_action.sa_mask);
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1845
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1847
perror_plus("sigaddset");
1848
exitcode = EX_OSERR;
1851
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1853
perror_plus("sigaddset");
1854
exitcode = EX_OSERR;
1857
/* Need to check if the handler is SIG_IGN before handling:
1858
| [[info:libc:Initial Signal Actions]] |
1859
| [[info:libc:Basic Signal Handling]] |
1861
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1863
perror_plus("sigaction");
1866
if(old_sigterm_action.sa_handler != SIG_IGN){
1867
ret = sigaction(SIGINT, &sigterm_action, NULL);
1869
perror_plus("sigaction");
1870
exitcode = EX_OSERR;
1874
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1876
perror_plus("sigaction");
1879
if(old_sigterm_action.sa_handler != SIG_IGN){
1880
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1882
perror_plus("sigaction");
1883
exitcode = EX_OSERR;
1887
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1889
perror_plus("sigaction");
1892
if(old_sigterm_action.sa_handler != SIG_IGN){
1893
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1895
perror_plus("sigaction");
1896
exitcode = EX_OSERR;
1005
1901
/* If the interface is down, bring it up */
1006
if(interface[0] != '\0'){
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1914
/* Re-raise priviliges */
1918
perror_plus("seteuid");
1007
1921
#ifdef __linux__
1008
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1009
messages to mess up the prompt */
1923
messages about the network interface to mess up the prompt */
1010
1924
ret = klogctl(8, NULL, 5);
1011
1925
bool restore_loglevel = true;
1013
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1930
#endif /* __linux__ */
1018
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1021
exitcode = EXIT_FAILURE;
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1022
1936
#ifdef __linux__
1023
1937
if(restore_loglevel){
1024
1938
ret = klogctl(7, NULL, 0);
1940
perror_plus("klogctl");
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1948
perror_plus("seteuid");
1032
1952
strcpy(network.ifr_name, interface);
1033
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1035
perror("ioctl SIOCGIFFLAGS");
1955
perror_plus("ioctl SIOCGIFFLAGS");
1036
1956
#ifdef __linux__
1037
1957
if(restore_loglevel){
1038
1958
ret = klogctl(7, NULL, 0);
1960
perror_plus("klogctl");
1044
exitcode = EXIT_FAILURE;
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1969
perror_plus("seteuid");
1047
1973
if((network.ifr_flags & IFF_UP) == 0){
1048
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1049
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1051
perror("ioctl SIOCSIFFLAGS");
1052
exitcode = EXIT_FAILURE;
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1053
1981
#ifdef __linux__
1054
1982
if(restore_loglevel){
1055
1983
ret = klogctl(7, NULL, 0);
1985
perror_plus("klogctl");
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1993
perror_plus("seteuid");
1064
/* sleep checking until interface is running */
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
1065
2000
for(int i=0; i < delay * 4; i++){
1066
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1068
perror("ioctl SIOCGIFFLAGS");
2003
perror_plus("ioctl SIOCGIFFLAGS");
1069
2004
} else if(network.ifr_flags & IFF_RUNNING){
1072
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
1073
2008
ret = nanosleep(&sleeptime, NULL);
1074
2009
if(ret == -1 and errno != EINTR){
1075
perror("nanosleep");
2010
perror_plus("nanosleep");
1078
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2017
perror_plus("close");
1082
2020
#ifdef __linux__
1083
2021
if(restore_loglevel){
1084
2022
/* Restores kernel loglevel to default */
1085
2023
ret = klogctl(7, NULL, 0);
2025
perror_plus("klogctl");
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2031
/* Lower privileges */
2034
perror_plus("seteuid");
1107
2042
ret = init_gnutls_global(pubkey, seckey);
1109
fprintf(stderr, "init_gnutls_global failed\n");
1110
exitcode = EXIT_FAILURE;
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
exitcode = EX_UNAVAILABLE;
1113
2048
gnutls_initialized = true;
1116
2055
if(mkdtemp(tempdir) == NULL){
2056
perror_plus("mkdtemp");
1120
2059
tempdir_created = true;
1122
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
1123
fprintf(stderr, "init_gpgme failed\n");
1124
exitcode = EXIT_FAILURE;
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2067
exitcode = EX_UNAVAILABLE;
1127
2070
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;
1139
2077
if(connect_to != NULL){
1141
2079
/* (Mainly meant for debugging) */
1142
2080
char *address = strrchr(connect_to, ':');
1143
2081
if(address == NULL){
1144
fprintf(stderr, "No colon in address\n");
1145
exitcode = EXIT_FAILURE;
2082
fprintf_plus(stderr, "No colon in address\n");
2083
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;
2093
tmpmax = strtoimax(address+1, &tmp, 10);
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2096
fprintf_plus(stderr, "Bad port number\n");
2097
exitcode = EX_USAGE;
1156
2105
port = (uint16_t)tmpmax;
1157
2106
*address = '\0';
1158
address = connect_to;
1159
2107
/* Colon in address indicates IPv6 */
1161
if(strchr(address, ':') != NULL){
2109
if(strchr(connect_to, ':') != NULL){
2111
/* Accept [] around IPv6 address - see RFC 5952 */
2112
if(connect_to[0] == '[' and address[-1] == ']')
1166
ret = start_mandos_communication(address, port, if_index,
1169
exitcode = EXIT_FAILURE;
2120
address = connect_to;
2126
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2128
if(quit_now or ret == 0){
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
(int)retry_interval);
2135
sleep((int)retry_interval);
1171
2139
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;
1209
2167
/* Check if creating the Avahi server object succeeded */
1210
2168
if(mc.server == NULL){
1211
fprintf(stderr, "Failed to create Avahi server: %s\n",
1212
avahi_strerror(error));
1213
exitcode = EXIT_FAILURE;
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2171
exitcode = EX_UNAVAILABLE;
1217
2179
/* Create the Avahi service browser */
1218
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1220
2182
NULL, 0, browse_callback, NULL);
1221
2183
if(sb == NULL){
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;
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
avahi_strerror(avahi_server_errno(mc.server)));
2186
exitcode = EX_UNAVAILABLE;
1242
2194
/* Run the main loop */
1245
fprintf(stderr, "Starting Avahi loop search\n");
1248
avahi_simple_poll_loop(mc.simple_poll);
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
(ret == 0) ? "successfully" : "with error");
1253
fprintf(stderr, "%s exiting\n", argv[0]);
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1256
2213
/* Cleanup things */
1273
2230
gpgme_release(mc.ctx);
1276
/* Removes the temp directory used by GPGME */
2233
/* Cleans up the circular linked list of Mandos servers the client
2235
if(mc.current_server != NULL){
2236
mc.current_server->prev->next = NULL;
2237
while(mc.current_server != NULL){
2238
server *next = mc.current_server->next;
2239
free(mc.current_server);
2240
mc.current_server = next;
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2247
/* Re-raise priviliges */
2252
perror_plus("seteuid");
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
perror_plus("close");
2273
/* Lower privileges permanently */
2277
perror_plus("setuid");
2280
/* Removes the GPGME temp directory and all files inside */
1277
2281
if(tempdir_created){
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'))){
2282
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
1298
2289
char *fullname = NULL;
1299
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
1300
2291
direntry->d_name);
2293
perror_plus("asprintf");
1305
2296
ret = remove(fullname);
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1310
2301
free(fullname);
2305
/* need to clean even if 0 because man page doesn't specify */
2307
if (numentries == -1){
2308
perror_plus("scandir");
1314
2310
ret = rmdir(tempdir);
1315
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
2317
sigemptyset(&old_sigterm_action.sa_mask);
2318
old_sigterm_action.sa_handler = SIG_DFL;
2319
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2320
&old_sigterm_action,
2323
perror_plus("sigaction");
2326
ret = raise(signal_received);
2327
} while(ret != 0 and errno == EINTR);
2329
perror_plus("raise");
2332
TEMP_FAILURE_RETRY(pause());
1320
2335
return exitcode;