499
615
/* Called when a Mandos server is found */
500
616
static int start_mandos_communication(const char *ip, uint16_t port,
501
617
AvahiIfIndex if_index,
619
int ret, tcp_sd = -1;
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
506
625
char *buffer = NULL;
507
char *decrypted_buffer;
626
char *decrypted_buffer = NULL;
508
627
size_t buffer_length = 0;
509
628
size_t buffer_capacity = 0;
510
ssize_t decrypted_buffer_size;
513
char interface[IF_NAMESIZE];
514
631
gnutls_session_t session;
516
ret = init_gnutls_session (mc, &session);
522
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
526
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(if_indextoname((unsigned int)if_index, interface) == NULL){
534
perror("if_indextoname");
537
fprintf(stderr, "Binding to interface %s\n", interface);
632
int pf; /* Protocol family */
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
ret = init_gnutls_session(&session);
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
667
perror_plus("socket");
540
677
memset(&to, 0, sizeof(to));
541
to.in6.sin6_family = AF_INET6;
542
/* It would be nice to have a way to detect if we were passed an
543
IPv4 address here. Now we assume an IPv6 address. */
544
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
687
perror_plus("inet_pton");
550
fprintf(stderr, "Bad address: %s\n", ip);
553
to.in6.sin6_port = htons(port); /* Spurious warning */
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wunreachable-code */
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
if(if_index == AVAHI_IF_UNSPEC){
706
fprintf_plus(stderr, "An IPv6 link-local address is"
707
" incomplete without a network interface\n");
711
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
715
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wunreachable-code */
555
to.in6.sin6_scope_id = (uint32_t)if_index;
558
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
char addrstr[INET6_ADDRSTRLEN] = "";
561
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
562
sizeof(addrstr)) == NULL){
726
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
727
char interface[IF_NAMESIZE];
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
perror_plus("if_indextoname");
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
perror_plus("inet_ntop");
565
751
if(strcmp(addrstr, ip) != 0){
566
fprintf(stderr, "Canonical address form: %s\n", addrstr);
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
571
ret = connect(tcp_sd, &to.in, sizeof(to));
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
perror_plus("connect");
577
781
const char *out = mandos_protocol_version;
580
784
size_t out_size = strlen(out);
581
785
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
582
out_size - written));
786
out_size - written));
789
perror_plus("write");
588
793
written += (size_t)ret;
589
794
if(written < out_size){
592
if (out == mandos_protocol_version){
797
if(out == mandos_protocol_version){
602
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
ret = gnutls_handshake (session);
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
829
ret = gnutls_handshake(session);
609
834
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
611
if (ret != GNUTLS_E_SUCCESS){
836
if(ret != GNUTLS_E_SUCCESS){
613
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
620
845
/* Read OpenPGP packet that contains the wanted password */
623
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
if (buffer_capacity == 0){
631
perror("adjustbuffer");
859
buffer_capacity = incbuffer(&buffer, buffer_length,
861
if(buffer_capacity == 0){
863
perror_plus("incbuffer");
636
873
sret = gnutls_record_recv(session, buffer+buffer_length,
643
880
case GNUTLS_E_INTERRUPTED:
644
881
case GNUTLS_E_AGAIN:
646
883
case GNUTLS_E_REHANDSHAKE:
648
ret = gnutls_handshake (session);
885
ret = gnutls_handshake(session);
649
891
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
651
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
658
fprintf(stderr, "Unknown error while reading data from"
659
" encrypted session with Mandos server\n");
661
gnutls_bye (session, GNUTLS_SHUT_RDWR);
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
903
gnutls_bye(session, GNUTLS_SHUT_RDWR);
803
1085
case AVAHI_BROWSER_ALL_FOR_NOW:
804
1086
case AVAHI_BROWSER_CACHE_EXHAUSTED:
806
fprintf(stderr, "No Mandos server found, still searching...\n");
1088
fprintf_plus(stderr, "No Mandos server found, still"
1095
/* Signal handler that stops main loop after SIGTERM */
1096
static void handle_sigterm(int sig){
1101
signal_received = sig;
1102
int old_errno = errno;
1103
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
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",
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1309
struct timespec now;
1310
struct timespec waited_time;
1311
intmax_t block_time;
1314
if(mc.current_server == NULL){
1316
fprintf_plus(stderr, "Wait until first server is found."
1319
ret = avahi_simple_poll_iterate(s, -1);
1322
fprintf_plus(stderr, "Check current_server if we should run"
1325
/* the current time */
1326
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1328
perror_plus("clock_gettime");
1331
/* Calculating in ms how long time between now and server
1332
who we visted longest time ago. Now - last seen. */
1333
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1335
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1337
/* total time is 10s/10,000ms.
1338
Converting to s from ms by dividing by 1,000,
1339
and ns to ms by dividing by 1,000,000. */
1340
block_time = ((retry_interval
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1349
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1355
avahi_simple_poll_quit(mc.simple_poll);
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1361
perror_plus("clock_gettime");
1364
mc.current_server = mc.current_server->next;
1365
block_time = 0; /* Call avahi to find new Mandos
1366
servers, but don't block */
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1372
if (ret > 0 or errno != EINTR){
1373
return (ret != 1) ? ret : 0;
1379
bool run_network_hooks(const char *mode, const char *interface,
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1387
perror_plus("scandir");
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1395
perror_plus("asprintf");
1398
pid_t hook_pid = fork();
1401
dup2(devnull, STDIN_FILENO);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1406
perror_plus("setenv");
1409
ret = setenv("DEVICE", interface, 1);
1411
perror_plus("setenv");
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1416
perror_plus("setenv");
1419
ret = setenv("MODE", mode, 1);
1421
perror_plus("setenv");
1425
ret = asprintf(&delaystring, "%f", delay);
1427
perror_plus("asprintf");
1430
ret = setenv("DELAY", delaystring, 1);
1433
perror_plus("setenv");
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
812
1477
int main(int argc, char *argv[]){
813
AvahiSServiceBrowser *sb = NULL;
816
int exitcode = EXIT_SUCCESS;
817
const char *interface = "eth0";
818
struct ifreq network;
822
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
824
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
828
mandos_context mc = { .simple_poll = NULL, .server = NULL,
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
835
struct argp_option options[] = {
836
{ .name = "debug", .key = 128,
837
.doc = "Debug mode", .group = 3 },
838
{ .name = "connect", .key = 'c',
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
842
{ .name = "interface", .key = 'i',
844
.doc = "Interface that will be used to search for Mandos"
847
{ .name = "seckey", .key = 's',
849
.doc = "OpenPGP secret key file base name",
851
{ .name = "pubkey", .key = 'p',
853
.doc = "OpenPGP public key file base name",
855
{ .name = "dh-bits", .key = 129,
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
860
{ .name = "priority", .key = 130,
862
.doc = "GnuTLS priority string for the TLS handshake",
867
error_t parse_opt (int key, char *arg,
868
struct argp_state *state) {
870
case 128: /* --debug */
873
case 'c': /* --connect */
876
case 'i': /* --interface */
879
case 's': /* --seckey */
882
case 'p': /* --pubkey */
885
case 129: /* --dh-bits */
886
ret = sscanf(arg, "%u", &mc.dh_bits);
888
fprintf(stderr, "Bad number of DH bits\n");
892
case 130: /* --priority */
900
return ARGP_ERR_UNKNOWN;
905
struct argp argp = { .options = options, .parser = parse_opt,
907
.doc = "Mandos client -- Get and decrypt"
908
" passwords from a Mandos server" };
909
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
910
if (ret == ARGP_ERR_UNKNOWN){
911
fprintf(stderr, "Unknown error while parsing arguments\n");
912
exitcode = EXIT_FAILURE;
917
/* If the interface is down, bring it up */
919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
exitcode = EXIT_FAILURE;
925
strcpy(network.ifr_name, interface);
926
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
perror("ioctl SIOCGIFFLAGS");
929
exitcode = EXIT_FAILURE;
932
if((network.ifr_flags & IFF_UP) == 0){
933
network.ifr_flags |= IFF_UP;
934
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
perror("ioctl SIOCSIFFLAGS");
937
exitcode = EXIT_FAILURE;
941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
960
ret = init_gnutls_global(&mc, pubkey, seckey);
962
fprintf(stderr, "init_gnutls_global failed\n");
963
exitcode = EXIT_FAILURE;
966
gnutls_initalized = true;
969
if(mkdtemp(tempdir) == NULL){
975
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
976
fprintf(stderr, "gpgme_initalized failed\n");
977
exitcode = EXIT_FAILURE;
980
gpgme_initalized = true;
1478
AvahiSServiceBrowser *sb = NULL;
1483
int exitcode = EXIT_SUCCESS;
1484
const char *interface = "";
1485
struct ifreq network;
1487
bool take_down_interface = false;
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1491
bool tempdir_created = false;
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1493
const char *seckey = PATHDIR "/" SECKEY;
1494
const char *pubkey = PATHDIR "/" PUBKEY;
1496
bool gnutls_initialized = false;
1497
bool gpgme_initialized = false;
1499
double retry_interval = 10; /* 10s between trying a server and
1500
retrying the same server again */
1502
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1503
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1508
/* Lower any group privileges we might have, just to be safe */
1512
perror_plus("setgid");
1515
/* Lower user privileges (temporarily) */
1519
perror_plus("seteuid");
1527
struct argp_option options[] = {
1528
{ .name = "debug", .key = 128,
1529
.doc = "Debug mode", .group = 3 },
1530
{ .name = "connect", .key = 'c',
1531
.arg = "ADDRESS:PORT",
1532
.doc = "Connect directly to a specific Mandos server",
1534
{ .name = "interface", .key = 'i',
1536
.doc = "Network interface that will be used to search for"
1539
{ .name = "seckey", .key = 's',
1541
.doc = "OpenPGP secret key file base name",
1543
{ .name = "pubkey", .key = 'p',
1545
.doc = "OpenPGP public key file base name",
1547
{ .name = "dh-bits", .key = 129,
1549
.doc = "Bit length of the prime number used in the"
1550
" Diffie-Hellman key exchange",
1552
{ .name = "priority", .key = 130,
1554
.doc = "GnuTLS priority string for the TLS handshake",
1556
{ .name = "delay", .key = 131,
1558
.doc = "Maximum delay to wait for interface startup",
1560
{ .name = "retry", .key = 132,
1562
.doc = "Retry interval used when denied by the mandos server",
1564
{ .name = "network-hook-dir", .key = 133,
1566
.doc = "Directory where network hooks are located",
1569
* These reproduce what we would get without ARGP_NO_HELP
1571
{ .name = "help", .key = '?',
1572
.doc = "Give this help list", .group = -1 },
1573
{ .name = "usage", .key = -3,
1574
.doc = "Give a short usage message", .group = -1 },
1575
{ .name = "version", .key = 'V',
1576
.doc = "Print program version", .group = -1 },
1580
error_t parse_opt(int key, char *arg,
1581
struct argp_state *state){
1584
case 128: /* --debug */
1587
case 'c': /* --connect */
1590
case 'i': /* --interface */
1593
case 's': /* --seckey */
1596
case 'p': /* --pubkey */
1599
case 129: /* --dh-bits */
1601
tmpmax = strtoimax(arg, &tmp, 10);
1602
if(errno != 0 or tmp == arg or *tmp != '\0'
1603
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1604
argp_error(state, "Bad number of DH bits");
1606
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1608
case 130: /* --priority */
1611
case 131: /* --delay */
1613
delay = strtof(arg, &tmp);
1614
if(errno != 0 or tmp == arg or *tmp != '\0'){
1615
argp_error(state, "Bad delay");
1617
case 132: /* --retry */
1619
retry_interval = strtod(arg, &tmp);
1620
if(errno != 0 or tmp == arg or *tmp != '\0'
1621
or (retry_interval * 1000) > INT_MAX
1622
or retry_interval < 0){
1623
argp_error(state, "Bad retry interval");
1626
case 133: /* --network-hook-dir */
1630
* These reproduce what we would get without ARGP_NO_HELP
1632
case '?': /* --help */
1633
argp_state_help(state, state->out_stream,
1634
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1635
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1636
case -3: /* --usage */
1637
argp_state_help(state, state->out_stream,
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
exit(argp_err_exit_status);
1646
return ARGP_ERR_UNKNOWN;
1651
struct argp argp = { .options = options, .parser = parse_opt,
1653
.doc = "Mandos client -- Get and decrypt"
1654
" passwords from a Mandos server" };
1655
ret = argp_parse(&argp, argc, argv,
1656
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1663
perror_plus("argp_parse");
1664
exitcode = EX_OSERR;
1667
exitcode = EX_USAGE;
1673
/* Work around Debian bug #633582:
1674
<http://bugs.debian.org/633582> */
1677
/* Re-raise priviliges */
1681
perror_plus("seteuid");
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1691
perror_plus("fstat");
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1697
perror_plus("fchown");
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1712
perror_plus("fstat");
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1718
perror_plus("fchown");
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1726
/* Lower privileges */
1730
perror_plus("seteuid");
1734
/* Run network hooks */
1736
/* Re-raise priviliges */
1740
perror_plus("seteuid");
1742
if(not run_network_hooks("start", interface, delay)){
1745
/* Lower privileges */
1749
perror_plus("seteuid");
1754
avahi_set_log_function(empty_log);
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1763
/* No up interfaces, look for any good interfaces */
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1774
if(interface == NULL){
1775
perror_plus("malloc");
1777
exitcode = EXIT_FAILURE;
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
from the signal handler */
1791
/* Initialize the pseudo-RNG for Avahi */
1792
srand((unsigned int) time(NULL));
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
1795
fprintf_plus(stderr,
1796
"Avahi: Failed to create simple poll object.\n");
1797
exitcode = EX_UNAVAILABLE;
1801
sigemptyset(&sigterm_action.sa_mask);
1802
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1804
perror_plus("sigaddset");
1805
exitcode = EX_OSERR;
1808
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1810
perror_plus("sigaddset");
1811
exitcode = EX_OSERR;
1814
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1816
perror_plus("sigaddset");
1817
exitcode = EX_OSERR;
1820
/* Need to check if the handler is SIG_IGN before handling:
1821
| [[info:libc:Initial Signal Actions]] |
1822
| [[info:libc:Basic Signal Handling]] |
1824
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1826
perror_plus("sigaction");
1829
if(old_sigterm_action.sa_handler != SIG_IGN){
1830
ret = sigaction(SIGINT, &sigterm_action, NULL);
1832
perror_plus("sigaction");
1833
exitcode = EX_OSERR;
1837
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1839
perror_plus("sigaction");
1842
if(old_sigterm_action.sa_handler != SIG_IGN){
1843
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1845
perror_plus("sigaction");
1846
exitcode = EX_OSERR;
1850
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1852
perror_plus("sigaction");
1855
if(old_sigterm_action.sa_handler != SIG_IGN){
1856
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1858
perror_plus("sigaction");
1859
exitcode = EX_OSERR;
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
983
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
984
1867
if(if_index == 0){
985
fprintf(stderr, "No such interface: \"%s\"\n", interface);
989
if(connect_to != NULL){
990
/* Connect directly, do not use Zeroconf */
991
/* (Mainly meant for debugging) */
992
char *address = strrchr(connect_to, ':');
994
fprintf(stderr, "No colon in address\n");
995
exitcode = EXIT_FAILURE;
999
ret = sscanf(address+1, "%" SCNu16, &port);
1001
fprintf(stderr, "Bad port number\n");
1002
exitcode = EXIT_FAILURE;
1006
address = connect_to;
1007
ret = start_mandos_communication(address, port, if_index, &mc);
1009
exitcode = EXIT_FAILURE;
1011
exitcode = EXIT_SUCCESS;
1017
avahi_set_log_function(empty_log);
1020
/* Initialize the pseudo-RNG for Avahi */
1021
srand((unsigned int) time(NULL));
1023
/* Allocate main Avahi loop object */
1024
mc.simple_poll = avahi_simple_poll_new();
1025
if (mc.simple_poll == NULL) {
1026
fprintf(stderr, "Avahi: Failed to create simple poll"
1028
exitcode = EXIT_FAILURE;
1033
AvahiServerConfig config;
1034
/* Do not publish any local Zeroconf records */
1035
avahi_server_config_init(&config);
1036
config.publish_hinfo = 0;
1037
config.publish_addresses = 0;
1038
config.publish_workstation = 0;
1039
config.publish_domain = 0;
1041
/* Allocate a new server */
1042
mc.server = avahi_server_new(avahi_simple_poll_get
1043
(mc.simple_poll), &config, NULL,
1046
/* Free the Avahi configuration data */
1047
avahi_server_config_free(&config);
1050
/* Check if creating the Avahi server object succeeded */
1051
if (mc.server == NULL) {
1052
fprintf(stderr, "Failed to create Avahi server: %s\n",
1053
avahi_strerror(error));
1054
exitcode = EXIT_FAILURE;
1058
/* Create the Avahi service browser */
1059
sb = avahi_s_service_browser_new(mc.server, if_index,
1061
"_mandos._tcp", NULL, 0,
1062
browse_callback, &mc);
1064
fprintf(stderr, "Failed to create service browser: %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
exitcode = EXIT_FAILURE;
1070
/* Run the main loop */
1073
fprintf(stderr, "Starting Avahi loop search\n");
1076
avahi_simple_poll_loop(mc.simple_poll);
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1877
/* Re-raise priviliges */
1881
perror_plus("seteuid");
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1893
#endif /* __linux__ */
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1903
perror_plus("klogctl");
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1911
perror_plus("seteuid");
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
perror_plus("ioctl SIOCGIFFLAGS");
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1923
perror_plus("klogctl");
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1932
perror_plus("seteuid");
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1948
perror_plus("klogctl");
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1956
perror_plus("seteuid");
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1980
perror_plus("close");
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1988
perror_plus("klogctl");
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1994
/* Lower privileges */
1997
perror_plus("seteuid");
2005
ret = init_gnutls_global(pubkey, seckey);
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2008
exitcode = EX_UNAVAILABLE;
2011
gnutls_initialized = true;
2018
if(mkdtemp(tempdir) == NULL){
2019
perror_plus("mkdtemp");
2022
tempdir_created = true;
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2030
exitcode = EX_UNAVAILABLE;
2033
gpgme_initialized = true;
2040
if(connect_to != NULL){
2041
/* Connect directly, do not use Zeroconf */
2042
/* (Mainly meant for debugging) */
2043
char *address = strrchr(connect_to, ':');
2044
if(address == NULL){
2045
fprintf_plus(stderr, "No colon in address\n");
2046
exitcode = EX_USAGE;
2056
tmpmax = strtoimax(address+1, &tmp, 10);
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
or tmpmax != (uint16_t)tmpmax){
2059
fprintf_plus(stderr, "Bad port number\n");
2060
exitcode = EX_USAGE;
2068
port = (uint16_t)tmpmax;
2070
/* Colon in address indicates IPv6 */
2072
if(strchr(connect_to, ':') != NULL){
2074
/* Accept [] around IPv6 address - see RFC 5952 */
2075
if(connect_to[0] == '[' and address[-1] == ']')
2083
address = connect_to;
2089
while(not quit_now){
2090
ret = start_mandos_communication(address, port, if_index, af);
2091
if(quit_now or ret == 0){
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
(int)retry_interval);
2098
sleep((int)retry_interval);
2102
exitcode = EXIT_SUCCESS;
2113
AvahiServerConfig config;
2114
/* Do not publish any local Zeroconf records */
2115
avahi_server_config_init(&config);
2116
config.publish_hinfo = 0;
2117
config.publish_addresses = 0;
2118
config.publish_workstation = 0;
2119
config.publish_domain = 0;
2121
/* Allocate a new server */
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2126
/* Free the Avahi configuration data */
2127
avahi_server_config_free(&config);
2130
/* Check if creating the Avahi server object succeeded */
2131
if(mc.server == NULL){
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2134
exitcode = EX_UNAVAILABLE;
2142
/* Create the Avahi service browser */
2143
sb = avahi_s_service_browser_new(mc.server, if_index,
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2145
NULL, 0, browse_callback, NULL);
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
avahi_strerror(avahi_server_errno(mc.server)));
2149
exitcode = EX_UNAVAILABLE;
2157
/* Run the main loop */
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
(ret == 0) ? "successfully" : "with error");
1081
fprintf(stderr, "%s exiting\n", argv[0]);
1084
/* Cleanup things */
1086
avahi_s_service_browser_free(sb);
1088
if (mc.server != NULL)
1089
avahi_server_free(mc.server);
1091
if (mc.simple_poll != NULL)
1092
avahi_simple_poll_free(mc.simple_poll);
1094
if (gnutls_initalized){
1095
gnutls_certificate_free_credentials(mc.cred);
1096
gnutls_global_deinit ();
1097
gnutls_dh_params_deinit(mc.dh_params);
1100
if(gpgme_initalized){
1101
gpgme_release(mc.ctx);
1104
/* Removes the temp directory used by GPGME */
1105
if(tempdir[0] != '\0'){
1107
struct dirent *direntry;
1108
d = opendir(tempdir);
1110
if(errno != ENOENT){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1127
ret = unlink(fullname);
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1137
ret = rmdir(tempdir);
1138
if(ret == -1 and errno != ENOENT){
2173
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2176
/* Cleanup things */
2178
avahi_s_service_browser_free(sb);
2180
if(mc.server != NULL)
2181
avahi_server_free(mc.server);
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2186
if(gnutls_initialized){
2187
gnutls_certificate_free_credentials(mc.cred);
2188
gnutls_global_deinit();
2189
gnutls_dh_params_deinit(mc.dh_params);
2192
if(gpgme_initialized){
2193
gpgme_release(mc.ctx);
2196
/* Cleans up the circular linked list of Mandos servers the client
2198
if(mc.current_server != NULL){
2199
mc.current_server->prev->next = NULL;
2200
while(mc.current_server != NULL){
2201
server *next = mc.current_server->next;
2202
free(mc.current_server);
2203
mc.current_server = next;
2207
/* Re-raise priviliges */
2212
perror_plus("seteuid");
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2233
perror_plus("close");
2237
/* Lower privileges permanently */
2241
perror_plus("setuid");
2244
/* Removes the GPGME temp directory and all files inside */
2245
if(tempdir_created){
2246
struct dirent **direntries = NULL;
2247
struct dirent *direntry = NULL;
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2250
if (numentries > 0){
2251
for(int i = 0; i < numentries; i++){
2252
direntry = direntries[i];
2253
char *fullname = NULL;
2254
ret = asprintf(&fullname, "%s/%s", tempdir,
2257
perror_plus("asprintf");
2260
ret = remove(fullname);
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2269
/* need to clean even if 0 because man page doesn't specify */
2271
if (numentries == -1){
2272
perror_plus("scandir");
2274
ret = rmdir(tempdir);
2275
if(ret == -1 and errno != ENOENT){
2276
perror_plus("rmdir");
2281
sigemptyset(&old_sigterm_action.sa_mask);
2282
old_sigterm_action.sa_handler = SIG_DFL;
2283
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2284
&old_sigterm_action,
2287
perror_plus("sigaction");
2290
ret = raise(signal_received);
2291
} while(ret != 0 and errno == EINTR);
2293
perror_plus("raise");
2296
TEMP_FAILURE_RETRY(pause());