617
502
/* Called when a Mandos server is found */
618
503
static int start_mandos_communication(const char *ip, uint16_t port,
619
504
AvahiIfIndex if_index,
621
int ret, tcp_sd = -1;
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
627
508
char *buffer = NULL;
628
char *decrypted_buffer = NULL;
509
char *decrypted_buffer;
629
510
size_t buffer_length = 0;
630
511
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
515
char interface[IF_NAMESIZE];
633
516
gnutls_session_t session;
634
int pf; /* Protocol family */
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
ret = init_gnutls_session(&session);
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
perror_plus("socket");
518
ret = init_gnutls_session (mc, &session);
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
539
fprintf(stderr, "Binding to interface %s\n", interface);
679
542
memset(&to, 0, sizeof(to));
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
689
perror_plus("inet_pton");
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
702
-Wunreachable-code */
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
if(if_index == AVAHI_IF_UNSPEC){
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
713
/* Set the network interface number as scope */
714
to.in6.sin6_scope_id = (uint32_t)if_index;
717
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wunreachable-code */
552
fprintf(stderr, "Bad address: %s\n", ip);
555
to.in6.sin6_port = htons(port); /* Spurious warning */
557
to.in6.sin6_scope_id = (uint32_t)if_index;
728
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
729
char interface[IF_NAMESIZE];
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
731
perror_plus("if_indextoname");
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
perror_plus("inet_ntop");
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
753
567
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
568
fprintf(stderr, "Canonical address form: %s\n", addrstr);
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
perror_plus("connect");
573
ret = connect(tcp_sd, &to.in, sizeof(to));
783
579
const char *out = mandos_protocol_version;
786
582
size_t out_size = strlen(out);
787
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
788
out_size - written));
791
perror_plus("write");
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
out_size - written));
795
590
written += (size_t)ret;
796
591
if(written < out_size){
799
if(out == mandos_protocol_version){
594
if (out == mandos_protocol_version){
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
831
ret = gnutls_handshake(session);
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
610
ret = gnutls_handshake (session);
836
611
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
838
if(ret != GNUTLS_E_SUCCESS){
613
if (ret != GNUTLS_E_SUCCESS){
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
847
622
/* Read OpenPGP packet that contains the wanted password */
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
861
buffer_capacity = incbuffer(&buffer, buffer_length,
863
if(buffer_capacity == 0){
865
perror_plus("incbuffer");
875
sret = gnutls_record_recv(session, buffer+buffer_length,
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
638
ret = gnutls_record_recv(session, buffer+buffer_length,
882
645
case GNUTLS_E_INTERRUPTED:
883
646
case GNUTLS_E_AGAIN:
885
648
case GNUTLS_E_REHANDSHAKE:
887
ret = gnutls_handshake(session);
650
ret = gnutls_handshake (session);
893
651
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
905
gnutls_bye(session, GNUTLS_SHUT_RDWR);
660
fprintf(stderr, "Unknown error while reading data from"
661
" encrypted session with Mandos server\n");
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
910
buffer_length += (size_t) sret;
667
buffer_length += (size_t) ret;
915
fprintf_plus(stderr, "Closing TLS session\n");
924
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
929
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
931
if(buffer_length > 0){
932
ssize_t decrypted_buffer_size;
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
672
fprintf(stderr, "Closing TLS session\n");
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
934
680
&decrypted_buffer);
935
if(decrypted_buffer_size >= 0){
681
if (decrypted_buffer_size >= 0){
938
683
while(written < (size_t) decrypted_buffer_size){
944
ret = (int)fwrite(decrypted_buffer + written, 1,
945
(size_t)decrypted_buffer_size - written,
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
947
687
if(ret == 0 and ferror(stdout)){
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
689
fprintf(stderr, "Error writing encrypted data: %s\n",
956
695
written += (size_t)ret;
697
free(decrypted_buffer);
962
705
/* Shutdown procedure */
967
free(decrypted_buffer);
970
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
976
perror_plus("close");
978
gnutls_deinit(session);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
713
gnutls_deinit (session);
988
717
static void resolve_callback(AvahiSServiceResolver *r,
989
718
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
991
720
AvahiResolverEvent event,
992
721
const char *name,
993
722
const char *type,
1090
805
case AVAHI_BROWSER_ALL_FOR_NOW:
1091
806
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1093
fprintf_plus(stderr, "No Mandos server found, still"
808
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
/* Signal handler that stops main loop after SIGTERM */
1101
static void handle_sigterm(int sig){
1106
signal_received = sig;
1107
int old_errno = errno;
1108
/* set main loop to exit */
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1120
perror_plus("socket");
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
perror_plus("ioctl SIOCGIFFLAGS");
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1136
/* Reject the loopback device */
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1144
/* Accept point-to-point devices only if connect_to is specified */
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1152
/* Otherwise, reject non-broadcast-capable devices */
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1161
if(ifr->ifr_flags & IFF_NOARP){
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1169
/* Accept this device */
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1187
if(not get_flags(if_entry->d_name, &ifr)){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1195
if(not good_flags(if_entry->d_name, &ifr)){
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1212
if(not get_flags(if_entry->d_name, &ifr)){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if(not good_flags(if_entry->d_name, &ifr)){
1244
int notdotentries(const struct dirent *direntry){
1245
/* Skip "." and ".." */
1246
if(direntry->d_name[0] == '.'
1247
and (direntry->d_name[1] == '\0'
1248
or (direntry->d_name[1] == '.'
1249
and direntry->d_name[2] == '\0'))){
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1261
if((direntry->d_name)[0] == '\0'){
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1282
perror_plus("asprintf");
1286
ret = stat(fullname, &st);
1289
perror_plus("Could not stat hook");
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1318
struct timespec now;
1319
struct timespec waited_time;
1320
intmax_t block_time;
1323
if(mc.current_server == NULL){
1325
fprintf_plus(stderr, "Wait until first server is found."
1328
ret = avahi_simple_poll_iterate(s, -1);
1331
fprintf_plus(stderr, "Check current_server if we should run"
1334
/* the current time */
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1337
perror_plus("clock_gettime");
1340
/* Calculating in ms how long time between now and server
1341
who we visted longest time ago. Now - last seen. */
1342
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1344
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1346
/* total time is 10s/10,000ms.
1347
Converting to s from ms by dividing by 1,000,
1348
and ns to ms by dividing by 1,000,000. */
1349
block_time = ((retry_interval
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1364
avahi_simple_poll_quit(mc.simple_poll);
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1370
perror_plus("clock_gettime");
1373
mc.current_server = mc.current_server->next;
1374
block_time = 0; /* Call avahi to find new Mandos
1375
servers, but don't block */
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
if (ret > 0 or errno != EINTR){
1382
return (ret != 1) ? ret : 0;
1388
bool run_network_hooks(const char *mode, const char *interface,
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
perror_plus("scandir");
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1404
perror_plus("asprintf");
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
pid_t hook_pid = fork();
1414
/* Raise privileges */
1418
perror_plus("seteuid");
1420
/* Raise privileges even more */
1424
perror_plus("setuid");
1430
perror_plus("setgid");
1432
/* Reset supplementary groups */
1434
ret = setgroups(0, NULL);
1436
perror_plus("setgroups");
1438
dup2(devnull, STDIN_FILENO);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1443
perror_plus("setenv");
1446
ret = setenv("DEVICE", interface, 1);
1448
perror_plus("setenv");
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1453
perror_plus("setenv");
1456
ret = setenv("MODE", mode, 1);
1458
perror_plus("setenv");
1462
ret = asprintf(&delaystring, "%f", delay);
1464
perror_plus("asprintf");
1467
ret = setenv("DELAY", delaystring, 1);
1470
perror_plus("setenv");
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1517
814
int main(int argc, char *argv[]){
1518
AvahiSServiceBrowser *sb = NULL;
1523
int exitcode = EXIT_SUCCESS;
1524
const char *interface = "";
1525
struct ifreq network;
1527
bool take_down_interface = false;
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1531
bool tempdir_created = false;
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1533
const char *seckey = PATHDIR "/" SECKEY;
1534
const char *pubkey = PATHDIR "/" PUBKEY;
1536
bool gnutls_initialized = false;
1537
bool gpgme_initialized = false;
1539
double retry_interval = 10; /* 10s between trying a server and
1540
retrying the same server again */
1542
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1543
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1548
/* Lower any group privileges we might have, just to be safe */
1552
perror_plus("setgid");
1555
/* Lower user privileges (temporarily) */
1559
perror_plus("seteuid");
1567
struct argp_option options[] = {
1568
{ .name = "debug", .key = 128,
1569
.doc = "Debug mode", .group = 3 },
1570
{ .name = "connect", .key = 'c',
1571
.arg = "ADDRESS:PORT",
1572
.doc = "Connect directly to a specific Mandos server",
1574
{ .name = "interface", .key = 'i',
1576
.doc = "Network interface that will be used to search for"
1579
{ .name = "seckey", .key = 's',
1581
.doc = "OpenPGP secret key file base name",
1583
{ .name = "pubkey", .key = 'p',
1585
.doc = "OpenPGP public key file base name",
1587
{ .name = "dh-bits", .key = 129,
1589
.doc = "Bit length of the prime number used in the"
1590
" Diffie-Hellman key exchange",
1592
{ .name = "priority", .key = 130,
1594
.doc = "GnuTLS priority string for the TLS handshake",
1596
{ .name = "delay", .key = 131,
1598
.doc = "Maximum delay to wait for interface startup",
1600
{ .name = "retry", .key = 132,
1602
.doc = "Retry interval used when denied by the mandos server",
1604
{ .name = "network-hook-dir", .key = 133,
1606
.doc = "Directory where network hooks are located",
1609
* These reproduce what we would get without ARGP_NO_HELP
1611
{ .name = "help", .key = '?',
1612
.doc = "Give this help list", .group = -1 },
1613
{ .name = "usage", .key = -3,
1614
.doc = "Give a short usage message", .group = -1 },
1615
{ .name = "version", .key = 'V',
1616
.doc = "Print program version", .group = -1 },
1620
error_t parse_opt(int key, char *arg,
1621
struct argp_state *state){
1624
case 128: /* --debug */
1627
case 'c': /* --connect */
1630
case 'i': /* --interface */
1633
case 's': /* --seckey */
1636
case 'p': /* --pubkey */
1639
case 129: /* --dh-bits */
1641
tmpmax = strtoimax(arg, &tmp, 10);
1642
if(errno != 0 or tmp == arg or *tmp != '\0'
1643
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1644
argp_error(state, "Bad number of DH bits");
1646
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1648
case 130: /* --priority */
1651
case 131: /* --delay */
1653
delay = strtof(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'){
1655
argp_error(state, "Bad delay");
1657
case 132: /* --retry */
1659
retry_interval = strtod(arg, &tmp);
1660
if(errno != 0 or tmp == arg or *tmp != '\0'
1661
or (retry_interval * 1000) > INT_MAX
1662
or retry_interval < 0){
1663
argp_error(state, "Bad retry interval");
1666
case 133: /* --network-hook-dir */
1670
* These reproduce what we would get without ARGP_NO_HELP
1672
case '?': /* --help */
1673
argp_state_help(state, state->out_stream,
1674
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1675
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1676
case -3: /* --usage */
1677
argp_state_help(state, state->out_stream,
1678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1679
case 'V': /* --version */
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1681
exit(argp_err_exit_status);
1684
return ARGP_ERR_UNKNOWN;
1689
struct argp argp = { .options = options, .parser = parse_opt,
1691
.doc = "Mandos client -- Get and decrypt"
1692
" passwords from a Mandos server" };
1693
ret = argp_parse(&argp, argc, argv,
1694
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1701
perror_plus("argp_parse");
1702
exitcode = EX_OSERR;
1705
exitcode = EX_USAGE;
1711
/* Work around Debian bug #633582:
1712
<http://bugs.debian.org/633582> */
1714
/* Re-raise priviliges */
1718
perror_plus("seteuid");
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1729
perror_plus("fstat");
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1735
perror_plus("fchown");
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1750
perror_plus("fstat");
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1756
perror_plus("fchown");
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1764
/* Lower privileges */
1768
perror_plus("seteuid");
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1779
avahi_set_log_function(empty_log);
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1788
/* No up interfaces, look for any good interfaces */
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1799
if(interface == NULL){
1800
perror_plus("malloc");
1802
exitcode = EXIT_FAILURE;
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1815
from the signal handler */
1816
/* Initialize the pseudo-RNG for Avahi */
1817
srand((unsigned int) time(NULL));
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1822
exitcode = EX_UNAVAILABLE;
1826
sigemptyset(&sigterm_action.sa_mask);
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1833
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1835
perror_plus("sigaddset");
1836
exitcode = EX_OSERR;
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1845
/* Need to check if the handler is SIG_IGN before handling:
1846
| [[info:libc:Initial Signal Actions]] |
1847
| [[info:libc:Basic Signal Handling]] |
1849
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1851
perror_plus("sigaction");
1854
if(old_sigterm_action.sa_handler != SIG_IGN){
1855
ret = sigaction(SIGINT, &sigterm_action, NULL);
1857
perror_plus("sigaction");
1858
exitcode = EX_OSERR;
1862
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1864
perror_plus("sigaction");
1867
if(old_sigterm_action.sa_handler != SIG_IGN){
1868
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1870
perror_plus("sigaction");
1871
exitcode = EX_OSERR;
1875
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1877
perror_plus("sigaction");
1880
if(old_sigterm_action.sa_handler != SIG_IGN){
1881
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1883
perror_plus("sigaction");
1884
exitcode = EX_OSERR;
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
815
AvahiSServiceBrowser *sb = NULL;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
844
{ .name = "interface", .key = 'i',
846
.doc = "Interface that will be used to search for Mandos"
849
{ .name = "seckey", .key = 's',
851
.doc = "OpenPGP secret key file base name",
853
{ .name = "pubkey", .key = 'p',
855
.doc = "OpenPGP public key file base name",
857
{ .name = "dh-bits", .key = 129,
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
862
{ .name = "priority", .key = 130,
864
.doc = "GnuTLS priority string for the TLS handshake",
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
874
case 128: /* --debug */
877
case 'c': /* --connect */
880
case 'i': /* --interface */
883
case 's': /* --seckey */
886
case 'p': /* --pubkey */
889
case 129: /* --dh-bits */
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
897
case 130: /* --priority */
905
return ARGP_ERR_UNKNOWN;
910
struct argp argp = { .options = options, .parser = parse_opt,
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
922
ret = init_gnutls_global(&mc, pubkey, seckey);
924
fprintf(stderr, "init_gnutls_global failed\n");
925
exitcode = EXIT_FAILURE;
928
gnutls_initalized = true;
931
if(mkdtemp(tempdir) == NULL){
937
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
938
fprintf(stderr, "gpgme_initalized failed\n");
939
exitcode = EXIT_FAILURE;
942
gpgme_initalized = true;
945
/* If the interface is down, bring it up */
947
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
950
exitcode = EXIT_FAILURE;
953
strcpy(network.ifr_name, interface);
954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
956
perror("ioctl SIOCGIFFLAGS");
957
exitcode = EXIT_FAILURE;
960
if((network.ifr_flags & IFF_UP) == 0){
961
network.ifr_flags |= IFF_UP;
962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
964
perror("ioctl SIOCSIFFLAGS");
965
exitcode = EXIT_FAILURE;
969
ret = TEMP_FAILURE_RETRY(close(sd));
1891
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
989
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1902
/* Re-raise priviliges */
1906
perror_plus("seteuid");
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1918
#endif /* __linux__ */
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1928
perror_plus("klogctl");
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1936
perror_plus("seteuid");
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1943
perror_plus("ioctl SIOCGIFFLAGS");
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1948
perror_plus("klogctl");
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1957
perror_plus("seteuid");
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1973
perror_plus("klogctl");
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1981
perror_plus("seteuid");
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2005
perror_plus("close");
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2013
perror_plus("klogctl");
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2019
/* Lower privileges */
2022
perror_plus("seteuid");
2030
ret = init_gnutls_global(pubkey, seckey);
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
exitcode = EX_UNAVAILABLE;
2036
gnutls_initialized = true;
2043
if(mkdtemp(tempdir) == NULL){
2044
perror_plus("mkdtemp");
2047
tempdir_created = true;
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2055
exitcode = EX_UNAVAILABLE;
2058
gpgme_initialized = true;
2065
if(connect_to != NULL){
2066
/* Connect directly, do not use Zeroconf */
2067
/* (Mainly meant for debugging) */
2068
char *address = strrchr(connect_to, ':');
2069
if(address == NULL){
2070
fprintf_plus(stderr, "No colon in address\n");
2071
exitcode = EX_USAGE;
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2083
or tmpmax != (uint16_t)tmpmax){
2084
fprintf_plus(stderr, "Bad port number\n");
2085
exitcode = EX_USAGE;
2093
port = (uint16_t)tmpmax;
2095
/* Colon in address indicates IPv6 */
2097
if(strchr(connect_to, ':') != NULL){
2099
/* Accept [] around IPv6 address - see RFC 5952 */
2100
if(connect_to[0] == '[' and address[-1] == ']')
2108
address = connect_to;
2114
while(not quit_now){
2115
ret = start_mandos_communication(address, port, if_index, af);
2116
if(quit_now or ret == 0){
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
2123
sleep((int)retry_interval);
2127
exitcode = EXIT_SUCCESS;
2138
AvahiServerConfig config;
2139
/* Do not publish any local Zeroconf records */
2140
avahi_server_config_init(&config);
2141
config.publish_hinfo = 0;
2142
config.publish_addresses = 0;
2143
config.publish_workstation = 0;
2144
config.publish_domain = 0;
2146
/* Allocate a new server */
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2151
/* Free the Avahi configuration data */
2152
avahi_server_config_free(&config);
2155
/* Check if creating the Avahi server object succeeded */
2156
if(mc.server == NULL){
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
2159
exitcode = EX_UNAVAILABLE;
2167
/* Create the Avahi service browser */
2168
sb = avahi_s_service_browser_new(mc.server, if_index,
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2170
NULL, 0, browse_callback, NULL);
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2174
exitcode = EX_UNAVAILABLE;
2182
/* Run the main loop */
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1014
exitcode = EXIT_FAILURE;
1016
exitcode = EXIT_SUCCESS;
1022
avahi_set_log_function(empty_log);
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1033
exitcode = EXIT_FAILURE;
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1075
/* Run the main loop */
1078
fprintf(stderr, "Starting Avahi loop search\n");
1081
avahi_simple_poll_loop(mc.simple_poll);
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2201
/* Cleanup things */
2203
avahi_s_service_browser_free(sb);
2205
if(mc.server != NULL)
2206
avahi_server_free(mc.server);
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2211
if(gnutls_initialized){
2212
gnutls_certificate_free_credentials(mc.cred);
2213
gnutls_global_deinit();
2214
gnutls_dh_params_deinit(mc.dh_params);
2217
if(gpgme_initialized){
2218
gpgme_release(mc.ctx);
2221
/* Cleans up the circular linked list of Mandos servers the client
2223
if(mc.current_server != NULL){
2224
mc.current_server->prev->next = NULL;
2225
while(mc.current_server != NULL){
2226
server *next = mc.current_server->next;
2227
free(mc.current_server);
2228
mc.current_server = next;
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2235
/* Re-raise priviliges */
2240
perror_plus("seteuid");
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
perror_plus("close");
2261
/* Lower privileges permanently */
2265
perror_plus("setuid");
2268
/* Removes the GPGME temp directory and all files inside */
2269
if(tempdir_created){
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
2277
char *fullname = NULL;
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
2281
perror_plus("asprintf");
2284
ret = remove(fullname);
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2293
/* need to clean even if 0 because man page doesn't specify */
2295
if (numentries == -1){
2296
perror_plus("scandir");
2298
ret = rmdir(tempdir);
2299
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");
2305
sigemptyset(&old_sigterm_action.sa_mask);
2306
old_sigterm_action.sa_handler = SIG_DFL;
2307
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2308
&old_sigterm_action,
2311
perror_plus("sigaction");
2314
ret = raise(signal_received);
2315
} while(ret != 0 and errno == EINTR);
2317
perror_plus("raise");
2320
TEMP_FAILURE_RETRY(pause());
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1089
/* Cleanup things */
1091
avahi_s_service_browser_free(sb);
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1130
ret = unlink(fullname);
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1140
ret = rmdir(tempdir);