498
627
/* Called when a Mandos server is found */
499
628
static int start_mandos_communication(const char *ip, uint16_t port,
500
629
AvahiIfIndex if_index,
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
631
int ret, tcp_sd = -1;
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
504
637
char *buffer = NULL;
505
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
506
639
size_t buffer_length = 0;
507
640
size_t buffer_capacity = 0;
508
ssize_t decrypted_buffer_size;
511
char interface[IF_NAMESIZE];
512
643
gnutls_session_t session;
514
ret = init_gnutls_session (mc, &session);
644
int pf; /* Protocol family */
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
667
ret = init_gnutls_session(&session);
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
681
perror_plus("socket");
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
perror("if_indextoname");
535
fprintf(stderr, "Binding to interface %s\n", interface);
538
691
memset(&to, 0, sizeof(to));
539
to.in6.sin6_family = AF_INET6;
540
/* It would be nice to have a way to detect if we were passed an
541
IPv4 address here. Now we assume an IPv6 address. */
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
701
perror_plus("inet_pton");
548
fprintf(stderr, "Bad address: %s\n", ip);
551
to.in6.sin6_port = htons(port); /* Spurious warning */
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wunreachable-code */
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
727
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
731
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wunreachable-code */
553
to.in6.sin6_scope_id = (uint32_t)if_index;
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
558
char addrstr[INET6_ADDRSTRLEN] = "";
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
560
sizeof(addrstr)) == NULL){
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
char interface[IF_NAMESIZE];
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
766
perror_plus("inet_ntop");
563
768
if(strcmp(addrstr, ip) != 0){
564
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
569
ret = connect(tcp_sd, &to.in, sizeof(to));
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
perror_plus("connect");
575
799
const char *out = mandos_protocol_version;
578
802
size_t out_size = strlen(out);
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
804
out_size - written));
807
perror_plus("write");
586
811
written += (size_t)ret;
587
812
if(written < out_size){
590
if (out == mandos_protocol_version){
815
if(out == mandos_protocol_version){
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
606
ret = gnutls_handshake (session);
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
848
ret = gnutls_handshake(session);
607
853
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
609
if (ret != GNUTLS_E_SUCCESS){
855
if(ret != GNUTLS_E_SUCCESS){
611
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
618
865
/* Read OpenPGP packet that contains the wanted password */
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
879
buffer_capacity = incbuffer(&buffer, buffer_length,
627
880
buffer_capacity);
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
634
ret = gnutls_record_recv(session, buffer+buffer_length,
881
if(buffer_capacity == 0){
883
perror_plus("incbuffer");
893
sret = gnutls_record_recv(session, buffer+buffer_length,
641
900
case GNUTLS_E_INTERRUPTED:
642
901
case GNUTLS_E_AGAIN:
644
903
case GNUTLS_E_REHANDSHAKE:
646
ret = gnutls_handshake (session);
905
ret = gnutls_handshake(session);
647
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
656
fprintf(stderr, "Unknown error while reading data from"
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
657
923
" encrypted session with Mandos server\n");
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
663
buffer_length += (size_t) ret;
929
buffer_length += (size_t) sret;
668
fprintf(stderr, "Closing TLS session\n");
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer,
676
955
&decrypted_buffer);
677
if (decrypted_buffer_size >= 0){
956
if(decrypted_buffer_size >= 0){
679
959
while(written < (size_t) decrypted_buffer_size){
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
965
ret = (int)fwrite(decrypted_buffer + written, 1,
966
(size_t)decrypted_buffer_size - written,
683
968
if(ret == 0 and ferror(stdout)){
685
fprintf(stderr, "Error writing encrypted data: %s\n",
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
686
973
strerror(errno));
691
978
written += (size_t)ret;
693
free(decrypted_buffer);
701
984
/* Shutdown procedure */
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
989
free(decrypted_buffer);
992
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
998
perror_plus("close");
1000
gnutls_deinit(session);
709
gnutls_deinit (session);
713
1010
static void resolve_callback(AvahiSServiceResolver *r,
714
1011
AvahiIfIndex interface,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1012
AvahiProtocol proto,
716
1013
AvahiResolverEvent event,
717
1014
const char *name,
718
1015
const char *type,
801
1111
case AVAHI_BROWSER_ALL_FOR_NOW:
802
1112
case AVAHI_BROWSER_CACHE_EXHAUSTED:
804
fprintf(stderr, "No Mandos server found, still searching...\n");
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
1121
/* Signal handler that stops main loop after SIGTERM */
1122
static void handle_sigterm(int sig){
1127
signal_received = sig;
1128
int old_errno = errno;
1129
/* set main loop to exit */
1130
if(mc.simple_poll != NULL){
1131
avahi_simple_poll_quit(mc.simple_poll);
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
perror_plus("socket");
1144
strcpy(ifr->ifr_name, ifname);
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1148
perror_plus("ioctl SIOCGIFFLAGS");
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1165
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1173
/* Otherwise, reject non-broadcast-capable devices */
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
if(ifr->ifr_flags & IFF_NOARP){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1190
/* Accept this device */
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1199
* This function determines if a directory entry in /sys/class/net
1200
* corresponds to an acceptable network device.
1201
* (This function is passed to scandir(3) as a filter function.)
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1209
if(not get_flags(if_entry->d_name, &ifr)){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1218
if(not good_flags(if_entry->d_name, &ifr)){
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1235
if(not get_flags(if_entry->d_name, &ifr)){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1264
if(not good_flags(if_entry->d_name, &ifr)){
1270
int notdotentries(const struct dirent *direntry){
1271
/* Skip "." and ".." */
1272
if(direntry->d_name[0] == '.'
1273
and (direntry->d_name[1] == '\0'
1274
or (direntry->d_name[1] == '.'
1275
and direntry->d_name[2] == '\0'))){
1281
/* Is this directory entry a runnable program? */
1282
int runnable_hook(const struct dirent *direntry){
1286
if((direntry->d_name)[0] == '\0'){
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1299
if(((direntry->d_name)[0] == '#')
1301
/* Temporary #name# */
1305
/* XXX more rules here */
1307
ret = stat(direntry->d_name, &st);
1310
perror_plus("Could not stat plugin");
1314
if(not (S_ISREG(st.st_mode))){
1315
/* Not a regular file */
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
/* Not executable */
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1327
struct timespec now;
1328
struct timespec waited_time;
1329
intmax_t block_time;
1332
if(mc.current_server == NULL){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1337
ret = avahi_simple_poll_iterate(s, -1);
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1347
perror_plus("clock_gettime");
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc.current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc.current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc.current_server->ip,
1370
mc.current_server->port,
1371
mc.current_server->if_index,
1372
mc.current_server->af);
1374
avahi_simple_poll_quit(mc.simple_poll);
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc.current_server->last_seen);
1380
perror_plus("clock_gettime");
1383
mc.current_server = mc.current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
810
1398
int main(int argc, char *argv[]){
811
AvahiSServiceBrowser *sb = NULL;
814
int exitcode = EXIT_SUCCESS;
815
const char *interface = "eth0";
816
struct ifreq network;
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
840
{ .name = "interface", .key = 'i',
842
.doc = "Interface that will be used to search for Mandos"
845
{ .name = "seckey", .key = 's',
847
.doc = "OpenPGP secret key file base name",
849
{ .name = "pubkey", .key = 'p',
851
.doc = "OpenPGP public key file base name",
853
{ .name = "dh-bits", .key = 129,
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
858
{ .name = "priority", .key = 130,
860
.doc = "GnuTLS priority string for the TLS handshake",
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
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 */
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
893
case 130: /* --priority */
901
return ARGP_ERR_UNKNOWN;
906
struct argp argp = { .options = options, .parser = parse_opt,
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
918
/* If the interface is down, bring it up */
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
exitcode = EXIT_FAILURE;
926
strcpy(network.ifr_name, interface);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
929
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
1399
AvahiSServiceBrowser *sb = NULL;
1404
int exitcode = EXIT_SUCCESS;
1405
const char *interface = "";
1406
struct ifreq network;
1408
bool take_down_interface = false;
1411
char tempdir[] = "/tmp/mandosXXXXXX";
1412
bool tempdir_created = false;
1413
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1414
const char *seckey = PATHDIR "/" SECKEY;
1415
const char *pubkey = PATHDIR "/" PUBKEY;
1417
bool gnutls_initialized = false;
1418
bool gpgme_initialized = false;
1420
double retry_interval = 10; /* 10s between trying a server and
1421
retrying the same server again */
1423
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1424
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1429
/* Lower any group privileges we might have, just to be safe */
1433
perror_plus("setgid");
1436
/* Lower user privileges (temporarily) */
1440
perror_plus("seteuid");
1448
struct argp_option options[] = {
1449
{ .name = "debug", .key = 128,
1450
.doc = "Debug mode", .group = 3 },
1451
{ .name = "connect", .key = 'c',
1452
.arg = "ADDRESS:PORT",
1453
.doc = "Connect directly to a specific Mandos server",
1455
{ .name = "interface", .key = 'i',
1457
.doc = "Network interface that will be used to search for"
1460
{ .name = "seckey", .key = 's',
1462
.doc = "OpenPGP secret key file base name",
1464
{ .name = "pubkey", .key = 'p',
1466
.doc = "OpenPGP public key file base name",
1468
{ .name = "dh-bits", .key = 129,
1470
.doc = "Bit length of the prime number used in the"
1471
" Diffie-Hellman key exchange",
1473
{ .name = "priority", .key = 130,
1475
.doc = "GnuTLS priority string for the TLS handshake",
1477
{ .name = "delay", .key = 131,
1479
.doc = "Maximum delay to wait for interface startup",
1481
{ .name = "retry", .key = 132,
1483
.doc = "Retry interval used when denied by the mandos server",
1486
* These reproduce what we would get without ARGP_NO_HELP
1488
{ .name = "help", .key = '?',
1489
.doc = "Give this help list", .group = -1 },
1490
{ .name = "usage", .key = -3,
1491
.doc = "Give a short usage message", .group = -1 },
1492
{ .name = "version", .key = 'V',
1493
.doc = "Print program version", .group = -1 },
1497
error_t parse_opt(int key, char *arg,
1498
struct argp_state *state){
1501
case 128: /* --debug */
1504
case 'c': /* --connect */
1507
case 'i': /* --interface */
1510
case 's': /* --seckey */
1513
case 'p': /* --pubkey */
1516
case 129: /* --dh-bits */
1518
tmpmax = strtoimax(arg, &tmp, 10);
1519
if(errno != 0 or tmp == arg or *tmp != '\0'
1520
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1521
argp_error(state, "Bad number of DH bits");
1523
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1525
case 130: /* --priority */
1528
case 131: /* --delay */
1530
delay = strtof(arg, &tmp);
1531
if(errno != 0 or tmp == arg or *tmp != '\0'){
1532
argp_error(state, "Bad delay");
1534
case 132: /* --retry */
1536
retry_interval = strtod(arg, &tmp);
1537
if(errno != 0 or tmp == arg or *tmp != '\0'
1538
or (retry_interval * 1000) > INT_MAX
1539
or retry_interval < 0){
1540
argp_error(state, "Bad retry interval");
1544
* These reproduce what we would get without ARGP_NO_HELP
1546
case '?': /* --help */
1547
argp_state_help(state, state->out_stream,
1548
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1549
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1550
case -3: /* --usage */
1551
argp_state_help(state, state->out_stream,
1552
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
1556
exit(argp_err_exit_status);
1559
return ARGP_ERR_UNKNOWN;
1564
struct argp argp = { .options = options, .parser = parse_opt,
1566
.doc = "Mandos client -- Get and decrypt"
1567
" passwords from a Mandos server" };
1568
ret = argp_parse(&argp, argc, argv,
1569
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1576
perror_plus("argp_parse");
1577
exitcode = EX_OSERR;
1580
exitcode = EX_USAGE;
1586
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1590
/* Re-raise priviliges */
1594
perror_plus("seteuid");
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1604
perror_plus("fstat");
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1609
perror_plus("fchown");
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1624
perror_plus("fstat");
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1629
perror_plus("fchown");
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1637
/* Lower privileges */
1641
perror_plus("seteuid");
1645
/* Find network hooks and run them */
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1652
perror_plus("scandir");
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1661
perror_plus("asprintf");
1664
pid_t hook_pid = fork();
1667
dup2(devnull, STDIN_FILENO);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1672
perror_plus("setenv");
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1677
perror_plus("setenv");
1680
ret = setenv("MODE", "start", 1);
1682
perror_plus("setenv");
1686
ret = asprintf(&delaystring, "%f", delay);
1688
perror_plus("asprintf");
1691
ret = setenv("DELAY", delaystring, 1);
1694
perror_plus("setenv");
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
942
ret = TEMP_FAILURE_RETRY(close(sd));
961
ret = init_gnutls_global(&mc, pubkey, seckey);
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
967
gnutls_initalized = true;
970
if(mkdtemp(tempdir) == NULL){
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
981
gpgme_initalized = true;
1741
avahi_set_log_function(empty_log);
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1750
/* No up interfaces, look for any good interfaces */
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1762
if(interface == NULL){
1763
perror_plus("malloc");
1765
exitcode = EXIT_FAILURE;
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1773
exitcode = EXIT_FAILURE;
1778
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1779
from the signal handler */
1780
/* Initialize the pseudo-RNG for Avahi */
1781
srand((unsigned int) time(NULL));
1782
mc.simple_poll = avahi_simple_poll_new();
1783
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1786
exitcode = EX_UNAVAILABLE;
1790
sigemptyset(&sigterm_action.sa_mask);
1791
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1793
perror_plus("sigaddset");
1794
exitcode = EX_OSERR;
1797
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1799
perror_plus("sigaddset");
1800
exitcode = EX_OSERR;
1803
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1805
perror_plus("sigaddset");
1806
exitcode = EX_OSERR;
1809
/* Need to check if the handler is SIG_IGN before handling:
1810
| [[info:libc:Initial Signal Actions]] |
1811
| [[info:libc:Basic Signal Handling]] |
1813
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1815
perror_plus("sigaction");
1818
if(old_sigterm_action.sa_handler != SIG_IGN){
1819
ret = sigaction(SIGINT, &sigterm_action, NULL);
1821
perror_plus("sigaction");
1822
exitcode = EX_OSERR;
1826
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1828
perror_plus("sigaction");
1831
if(old_sigterm_action.sa_handler != SIG_IGN){
1832
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1834
perror_plus("sigaction");
1835
exitcode = EX_OSERR;
1839
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1841
perror_plus("sigaction");
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1847
perror_plus("sigaction");
1848
exitcode = EX_OSERR;
1853
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
984
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
1856
if(if_index == 0){
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
if(connect_to != NULL){
991
/* Connect directly, do not use Zeroconf */
992
/* (Mainly meant for debugging) */
993
char *address = strrchr(connect_to, ':');
995
fprintf(stderr, "No colon in address\n");
996
exitcode = EXIT_FAILURE;
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1002
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
1007
address = connect_to;
1008
ret = start_mandos_communication(address, port, if_index, &mc);
1010
exitcode = EXIT_FAILURE;
1012
exitcode = EXIT_SUCCESS;
1018
avahi_set_log_function(empty_log);
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1024
/* Allocate main Avahi loop object */
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if (mc.simple_poll == NULL) {
1027
fprintf(stderr, "Avahi: Failed to create simple poll"
1029
exitcode = EXIT_FAILURE;
1034
AvahiServerConfig config;
1035
/* Do not publish any local Zeroconf records */
1036
avahi_server_config_init(&config);
1037
config.publish_hinfo = 0;
1038
config.publish_addresses = 0;
1039
config.publish_workstation = 0;
1040
config.publish_domain = 0;
1042
/* Allocate a new server */
1043
mc.server = avahi_server_new(avahi_simple_poll_get
1044
(mc.simple_poll), &config, NULL,
1047
/* Free the Avahi configuration data */
1048
avahi_server_config_free(&config);
1051
/* Check if creating the Avahi server object succeeded */
1052
if (mc.server == NULL) {
1053
fprintf(stderr, "Failed to create Avahi server: %s\n",
1054
avahi_strerror(error));
1055
exitcode = EXIT_FAILURE;
1059
/* Create the Avahi service browser */
1060
sb = avahi_s_service_browser_new(mc.server, if_index,
1062
"_mandos._tcp", NULL, 0,
1063
browse_callback, &mc);
1065
fprintf(stderr, "Failed to create service browser: %s\n",
1066
avahi_strerror(avahi_server_errno(mc.server)));
1067
exitcode = EXIT_FAILURE;
1071
/* Run the main loop */
1074
fprintf(stderr, "Starting Avahi loop search\n");
1077
avahi_simple_poll_loop(mc.simple_poll);
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1867
/* Re-raise priviliges */
1871
perror_plus("seteuid");
1875
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1876
messages about the network interface to mess up the prompt */
1877
ret = klogctl(8, NULL, 5);
1878
bool restore_loglevel = true;
1880
restore_loglevel = false;
1881
perror_plus("klogctl");
1883
#endif /* __linux__ */
1885
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1890
if(restore_loglevel){
1891
ret = klogctl(7, NULL, 0);
1893
perror_plus("klogctl");
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1901
perror_plus("seteuid");
1905
strcpy(network.ifr_name, interface);
1906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1908
perror_plus("ioctl SIOCGIFFLAGS");
1910
if(restore_loglevel){
1911
ret = klogctl(7, NULL, 0);
1913
perror_plus("klogctl");
1916
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1922
perror_plus("seteuid");
1926
if((network.ifr_flags & IFF_UP) == 0){
1927
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1929
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1935
if(restore_loglevel){
1936
ret = klogctl(7, NULL, 0);
1938
perror_plus("klogctl");
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1946
perror_plus("seteuid");
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1953
for(int i=0; i < delay * 4; i++){
1954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1956
perror_plus("ioctl SIOCGIFFLAGS");
1957
} else if(network.ifr_flags & IFF_RUNNING){
1960
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
ret = nanosleep(&sleeptime, NULL);
1962
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1970
perror_plus("close");
1974
if(restore_loglevel){
1975
/* Restores kernel loglevel to default */
1976
ret = klogctl(7, NULL, 0);
1978
perror_plus("klogctl");
1981
#endif /* __linux__ */
1982
/* Lower privileges */
1984
if(take_down_interface){
1985
/* Lower privileges */
1988
perror_plus("seteuid");
1991
/* Lower privileges permanently */
1994
perror_plus("setuid");
2003
ret = init_gnutls_global(pubkey, seckey);
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2007
exitcode = EX_UNAVAILABLE;
2010
gnutls_initialized = true;
2017
if(mkdtemp(tempdir) == NULL){
2018
perror_plus("mkdtemp");
2021
tempdir_created = true;
2027
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"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(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
2047
exitcode = EX_USAGE;
2057
tmpmax = strtoimax(address+1, &tmp, 10);
2058
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2059
or tmpmax != (uint16_t)tmpmax){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
2062
exitcode = EX_USAGE;
2070
port = (uint16_t)tmpmax;
2072
/* Colon in address indicates IPv6 */
2074
if(strchr(connect_to, ':') != NULL){
2076
/* Accept [] around IPv6 address - see RFC 5952 */
2077
if(connect_to[0] == '[' and address[-1] == ']')
2085
address = connect_to;
2091
while(not quit_now){
2092
ret = start_mandos_communication(address, port, if_index, af);
2093
if(quit_now or ret == 0){
2097
fprintf(stderr, "Mandos plugin mandos-client: "
2098
"Retrying in %d seconds\n", (int)retry_interval);
2100
sleep((int)retry_interval);
2104
exitcode = EXIT_SUCCESS;
2115
AvahiServerConfig config;
2116
/* Do not publish any local Zeroconf records */
2117
avahi_server_config_init(&config);
2118
config.publish_hinfo = 0;
2119
config.publish_addresses = 0;
2120
config.publish_workstation = 0;
2121
config.publish_domain = 0;
2123
/* Allocate a new server */
2124
mc.server = avahi_server_new(avahi_simple_poll_get
2125
(mc.simple_poll), &config, NULL,
2128
/* Free the Avahi configuration data */
2129
avahi_server_config_free(&config);
2132
/* Check if creating the Avahi server object succeeded */
2133
if(mc.server == NULL){
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
2136
avahi_strerror(error));
2137
exitcode = EX_UNAVAILABLE;
2145
/* Create the Avahi service browser */
2146
sb = avahi_s_service_browser_new(mc.server, if_index,
2147
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2148
NULL, 0, browse_callback, NULL);
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
2152
avahi_strerror(avahi_server_errno(mc.server)));
2153
exitcode = EX_UNAVAILABLE;
2161
/* Run the main loop */
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2168
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
(int)(retry_interval * 1000));
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1085
/* Cleanup things */
1087
avahi_s_service_browser_free(sb);
1089
if (mc.server != NULL)
1090
avahi_server_free(mc.server);
1092
if (mc.simple_poll != NULL)
1093
avahi_simple_poll_free(mc.simple_poll);
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1126
ret = unlink(fullname);
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1136
ret = rmdir(tempdir);
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
2183
/* Cleanup things */
2185
avahi_s_service_browser_free(sb);
2187
if(mc.server != NULL)
2188
avahi_server_free(mc.server);
2190
if(mc.simple_poll != NULL)
2191
avahi_simple_poll_free(mc.simple_poll);
2193
if(gnutls_initialized){
2194
gnutls_certificate_free_credentials(mc.cred);
2195
gnutls_global_deinit();
2196
gnutls_dh_params_deinit(mc.dh_params);
2199
if(gpgme_initialized){
2200
gpgme_release(mc.ctx);
2203
/* Cleans up the circular linked list of Mandos servers the client
2205
if(mc.current_server != NULL){
2206
mc.current_server->prev->next = NULL;
2207
while(mc.current_server != NULL){
2208
server *next = mc.current_server->next;
2209
free(mc.current_server);
2210
mc.current_server = next;
2214
/* XXX run network hooks "stop" here */
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2222
perror_plus("seteuid");
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2237
perror_plus("close");
2239
/* Lower privileges permanently */
2243
perror_plus("setuid");
2248
/* Removes the GPGME temp directory and all files inside */
2249
if(tempdir_created){
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
direntry = direntries[i];
2257
char *fullname = NULL;
2258
ret = asprintf(&fullname, "%s/%s", tempdir,
2261
perror_plus("asprintf");
2264
ret = remove(fullname);
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2273
/* need to clean even if 0 because man page doesn't specify */
2275
if (numentries == -1){
2276
perror_plus("scandir");
2278
ret = rmdir(tempdir);
2279
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");
2285
sigemptyset(&old_sigterm_action.sa_mask);
2286
old_sigterm_action.sa_handler = SIG_DFL;
2287
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2288
&old_sigterm_action,
2291
perror_plus("sigaction");
2294
ret = raise(signal_received);
2295
} while(ret != 0 and errno == EINTR);
2297
perror_plus("raise");
2300
TEMP_FAILURE_RETRY(pause());