498
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
499
821
__attribute__((unused)) const char *txt){}
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
879
AvahiIfIndex if_index){
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
918
perror_plus("setgid");
921
/* Reset supplementary groups */
923
ret = setgroups(0, NULL);
925
perror_plus("setgroups");
929
ret = dup2(devnull, STDIN_FILENO);
931
perror_plus("dup2(devnull, STDIN_FILENO)");
934
ret = close(devnull);
936
perror_plus("close");
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
if(helperdir_fd == -1){
951
_exit(EX_UNAVAILABLE);
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
perror_plus("openat");
958
_exit(EX_UNAVAILABLE);
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
970
#pragma GCC diagnostic pop
972
perror_plus("fexecve");
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
992
if(kill(pid, SIGTERM) == -1){
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
1001
} while(pret == -1 and errno == EINTR);
1003
perror_plus("waitpid");
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1029
return add_delete_local_route(true, address, if_index);
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1038
return add_delete_local_route(false, address, if_index);
501
1041
/* Called when a Mandos server is found */
502
static int start_mandos_communication(const char *ip, uint16_t port,
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
503
1044
AvahiIfIndex if_index,
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1045
int af, mandos_context *mc){
1046
int ret, tcp_sd = -1;
1048
struct sockaddr_storage to;
507
1049
char *buffer = NULL;
508
char *decrypted_buffer;
1050
char *decrypted_buffer = NULL;
509
1051
size_t buffer_length = 0;
510
1052
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
514
char interface[IF_NAMESIZE];
515
1055
gnutls_session_t session;
517
ret = init_gnutls_session (mc, &session);
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
1056
int pf; /* Protocol family */
1057
bool route_added = false;
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1103
if_indextoname((unsigned int)if_index,
538
fprintf(stderr, "Binding to interface %s\n", interface);
541
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1111
ret = init_gnutls_session(&session, mc);
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1124
perror_plus("socket");
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
1145
perror_plus("inet_pton");
551
fprintf(stderr, "Bad address: %s\n", ip);
554
to.in6.sin6_port = htons(port); /* Spurious warning */
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1159
if(if_index == AVAHI_IF_UNSPEC){
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
1165
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
556
to.in6.sin6_scope_id = (uint32_t)if_index;
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
566
if(strcmp(addrstr, ip) != 0){
567
fprintf(stderr, "Canonical address form: %s\n", addrstr);
572
ret = connect(tcp_sd, &to.in, sizeof(to));
1178
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1179
char interface[IF_NAMESIZE];
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
perror_plus("if_indextoname");
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1226
if(errno == ENETUNREACH
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
route_added = add_local_route(ip, if_index);
1259
if(errno != ECONNREFUSED or debug){
1261
perror_plus("connect");
578
1274
const char *out = mandos_protocol_version;
581
1277
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
out_size - written));
1278
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1279
out_size - written));
1282
perror_plus("write");
587
1284
goto mandos_end;
589
1286
written += (size_t)ret;
590
1287
if(written < out_size){
593
if (out == mandos_protocol_version){
1290
if(out == mandos_protocol_version){
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
609
ret = gnutls_handshake (session);
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1325
ret = gnutls_handshake(session);
610
1330
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
if (ret != GNUTLS_E_SUCCESS){
1332
if(ret != GNUTLS_E_SUCCESS){
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
618
1338
goto mandos_end;
621
1341
/* Read OpenPGP packet that contains the wanted password */
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
637
ret = gnutls_record_recv(session, buffer+buffer_length,
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
1357
if(buffer_capacity == 0){
1359
perror_plus("incbuffer");
1369
sret = gnutls_record_recv(session, buffer+buffer_length,
644
1376
case GNUTLS_E_INTERRUPTED:
645
1377
case GNUTLS_E_AGAIN:
647
1379
case GNUTLS_E_REHANDSHAKE:
649
ret = gnutls_handshake (session);
1381
ret = gnutls_handshake(session);
650
1387
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
655
1393
goto mandos_end;
659
fprintf(stderr, "Unknown error while reading data from"
660
" encrypted session with Mandos server\n");
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
1399
gnutls_bye(session, GNUTLS_SHUT_RDWR);
663
1401
goto mandos_end;
666
buffer_length += (size_t) ret;
1404
buffer_length += (size_t) sret;
671
fprintf(stderr, "Closing TLS session\n");
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
680
if (decrypted_buffer_size >= 0){
1409
fprintf_plus(stderr, "Closing TLS session\n");
1418
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1423
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1425
if(buffer_length > 0){
1426
ssize_t decrypted_buffer_size;
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
1429
if(decrypted_buffer_size >= 0){
682
1432
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
1438
ret = (int)fwrite(decrypted_buffer + written, 1,
1439
(size_t)decrypted_buffer_size - written,
686
1441
if(ret == 0 and ferror(stdout)){
688
fprintf(stderr, "Error writing encrypted data: %s\n",
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
694
1450
written += (size_t)ret;
696
free(decrypted_buffer);
704
1456
/* Shutdown procedure */
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1467
free(decrypted_buffer);
1470
ret = close(tcp_sd);
1476
perror_plus("close");
1478
gnutls_deinit(session);
712
gnutls_deinit (session);
1488
__attribute__((nonnull))
716
1489
static void resolve_callback(AvahiSServiceResolver *r,
717
1490
AvahiIfIndex interface,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1491
AvahiProtocol proto,
719
1492
AvahiResolverEvent event,
720
1493
const char *name,
721
1494
const char *type,
804
1603
case AVAHI_BROWSER_ALL_FOR_NOW:
805
1604
case AVAHI_BROWSER_CACHE_EXHAUSTED:
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1606
fprintf_plus(stderr, "No Mandos server found, still"
1613
/* Signal handler that stops main loop after SIGTERM */
1614
static void handle_sigterm(int sig){
1619
signal_received = sig;
1620
int old_errno = errno;
1621
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1628
__attribute__((nonnull, warn_unused_result))
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1636
perror_plus("socket");
1640
strcpy(ifr->ifr_name, ifname);
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1645
perror_plus("ioctl SIOCGIFFLAGS");
1653
__attribute__((nonnull, warn_unused_result))
1654
bool good_flags(const char *ifname, const struct ifreq *ifr){
1656
/* Reject the loopback device */
1657
if(ifr->ifr_flags & IFF_LOOPBACK){
1659
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1664
/* Accept point-to-point devices only if connect_to is specified */
1665
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1667
fprintf_plus(stderr, "Accepting point-to-point interface"
1668
" \"%s\"\n", ifname);
1672
/* Otherwise, reject non-broadcast-capable devices */
1673
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1675
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1676
" \"%s\"\n", ifname);
1680
/* Reject non-ARP interfaces (including dummy interfaces) */
1681
if(ifr->ifr_flags & IFF_NOARP){
1683
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1689
/* Accept this device */
1691
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1697
* This function determines if a directory entry in /sys/class/net
1698
* corresponds to an acceptable network device.
1699
* (This function is passed to scandir(3) as a filter function.)
1701
__attribute__((nonnull, warn_unused_result))
1702
int good_interface(const struct dirent *if_entry){
1703
if(if_entry->d_name[0] == '.'){
1708
if(not get_flags(if_entry->d_name, &ifr)){
1710
fprintf_plus(stderr, "Failed to get flags for interface "
1711
"\"%s\"\n", if_entry->d_name);
1716
if(not good_flags(if_entry->d_name, &ifr)){
1723
* This function determines if a network interface is up.
1725
__attribute__((nonnull, warn_unused_result))
1726
bool interface_is_up(const char *interface){
1728
if(not get_flags(interface, &ifr)){
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1736
return (bool)(ifr.ifr_flags & IFF_UP);
1740
* This function determines if a network interface is running
1742
__attribute__((nonnull, warn_unused_result))
1743
bool interface_is_running(const char *interface){
1745
if(not get_flags(interface, &ifr)){
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1753
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1756
__attribute__((nonnull, pure, warn_unused_result))
1757
int notdotentries(const struct dirent *direntry){
1758
/* Skip "." and ".." */
1759
if(direntry->d_name[0] == '.'
1760
and (direntry->d_name[1] == '\0'
1761
or (direntry->d_name[1] == '.'
1762
and direntry->d_name[2] == '\0'))){
1768
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1770
int runnable_hook(const struct dirent *direntry){
1775
if((direntry->d_name)[0] == '\0'){
1780
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1781
"abcdefghijklmnopqrstuvwxyz"
1784
if((direntry->d_name)[sret] != '\0'){
1785
/* Contains non-allowed characters */
1787
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1796
perror_plus("Could not stat hook");
1800
if(not (S_ISREG(st.st_mode))){
1801
/* Not a regular file */
1803
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1808
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1809
/* Not executable */
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1817
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1823
__attribute__((nonnull, warn_unused_result))
1824
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
mandos_context *mc){
1827
struct timespec now;
1828
struct timespec waited_time;
1829
intmax_t block_time;
1832
if(mc->current_server == NULL){
1834
fprintf_plus(stderr, "Wait until first server is found."
1837
ret = avahi_simple_poll_iterate(s, -1);
1840
fprintf_plus(stderr, "Check current_server if we should run"
1843
/* the current time */
1844
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1846
perror_plus("clock_gettime");
1849
/* Calculating in ms how long time between now and server
1850
who we visted longest time ago. Now - last seen. */
1851
waited_time.tv_sec = (now.tv_sec
1852
- mc->current_server->last_seen.tv_sec);
1853
waited_time.tv_nsec = (now.tv_nsec
1854
- mc->current_server->last_seen.tv_nsec);
1855
/* total time is 10s/10,000ms.
1856
Converting to s from ms by dividing by 1,000,
1857
and ns to ms by dividing by 1,000,000. */
1858
block_time = ((retry_interval
1859
- ((intmax_t)waited_time.tv_sec * 1000))
1860
- ((intmax_t)waited_time.tv_nsec / 1000000));
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1867
if(block_time <= 0){
1868
ret = start_mandos_communication(mc->current_server->ip,
1869
mc->current_server->port,
1870
mc->current_server->if_index,
1871
mc->current_server->af, mc);
1873
avahi_simple_poll_quit(s);
1876
ret = clock_gettime(CLOCK_MONOTONIC,
1877
&mc->current_server->last_seen);
1879
perror_plus("clock_gettime");
1882
mc->current_server = mc->current_server->next;
1883
block_time = 0; /* Call avahi to find new Mandos
1884
servers, but don't block */
1887
ret = avahi_simple_poll_iterate(s, (int)block_time);
1890
if(ret > 0 or errno != EINTR){
1891
return (ret != 1) ? ret : 0;
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1900
struct dirent **direntries = NULL;
1901
if(hookdir_fd == -1){
1902
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1904
if(hookdir_fd == -1){
1905
if(errno == ENOENT){
1907
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1908
" found\n", hookdir);
1911
perror_plus("open");
1917
#if __GLIBC_PREREQ(2, 15)
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1927
#endif /* not __GLIBC__ */
1929
perror_plus("scandir");
1932
struct dirent *direntry;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1945
pid_t hook_pid = fork();
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1951
perror_plus("Failed to raise privileges");
1958
perror_plus("setgid");
1961
/* Reset supplementary groups */
1963
ret = setgroups(0, NULL);
1965
perror_plus("setgroups");
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
perror_plus("setenv");
1973
ret = setenv("DEVICE", interface, 1);
1975
perror_plus("setenv");
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
perror_plus("setenv");
1983
ret = setenv("MODE", mode, 1);
1985
perror_plus("setenv");
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1991
perror_plus("asprintf");
1994
ret = setenv("DELAY", delaystring, 1);
1997
perror_plus("setenv");
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2004
perror_plus("setenv");
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2019
ret = dup2(devnull, STDIN_FILENO);
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2024
ret = close(devnull);
2026
perror_plus("close");
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2041
perror_plus("fork");
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2087
__attribute__((nonnull, warn_unused_result))
2088
error_t bring_up_interface(const char *const interface,
2090
error_t old_errno = errno;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2105
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2114
network.ifr_flags |= IFF_UP; /* set flag */
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2119
perror_plus("socket");
2127
perror_plus("close");
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2142
perror_plus("Failed to raise privileges");
2147
bool restore_loglevel = false;
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2155
restore_loglevel = true;
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2168
#endif /* __linux__ */
2170
/* If raise_privileges() succeeded above */
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2176
perror_plus("Failed to lower privileges");
2180
/* Close the socket */
2183
perror_plus("close");
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i=0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2214
__attribute__((nonnull, warn_unused_result))
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2224
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
perror_plus("socket");
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2252
perror_plus("Failed to raise privileges");
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2258
/* If raise_privileges() succeeded above */
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2264
perror_plus("Failed to lower privileges");
2268
/* Close the socket */
2269
int ret = close(sd);
2271
perror_plus("close");
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
813
2289
int main(int argc, char *argv[]){
814
AvahiSServiceBrowser *sb = NULL;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
843
{ .name = "interface", .key = 'i',
845
.doc = "Interface that will be used to search for Mandos"
848
{ .name = "seckey", .key = 's',
850
.doc = "OpenPGP secret key file base name",
852
{ .name = "pubkey", .key = 'p',
854
.doc = "OpenPGP public key file base name",
856
{ .name = "dh-bits", .key = 129,
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
861
{ .name = "priority", .key = 130,
863
.doc = "GnuTLS priority string for the TLS handshake",
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
873
case 128: /* --debug */
876
case 'c': /* --connect */
879
case 'i': /* --interface */
882
case 's': /* --seckey */
885
case 'p': /* --pubkey */
888
case 129: /* --dh-bits */
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
896
case 130: /* --priority */
904
return ARGP_ERR_UNKNOWN;
909
struct argp argp = { .options = options, .parser = parse_opt,
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
921
/* If the interface is down, bring it up */
923
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
926
exitcode = EXIT_FAILURE;
929
strcpy(network.ifr_name, interface);
930
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
perror("ioctl SIOCGIFFLAGS");
933
exitcode = EXIT_FAILURE;
936
if((network.ifr_flags & IFF_UP) == 0){
937
network.ifr_flags |= IFF_UP;
938
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
perror("ioctl SIOCSIFFLAGS");
941
exitcode = EXIT_FAILURE;
945
ret = TEMP_FAILURE_RETRY(close(sd));
964
ret = init_gnutls_global(&mc, pubkey, seckey);
966
fprintf(stderr, "init_gnutls_global failed\n");
967
exitcode = EXIT_FAILURE;
970
gnutls_initalized = true;
973
if(mkdtemp(tempdir) == NULL){
979
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
980
fprintf(stderr, "pgpme_initalized failed\n");
981
exitcode = EXIT_FAILURE;
984
pgpme_initalized = true;
987
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
fprintf(stderr, "No such interface: \"%s\"\n", interface);
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509:"
2292
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2293
.interfaces = NULL, .interfaces_size = 0 };
2294
AvahiSServiceBrowser *sb = NULL;
2299
int exitcode = EXIT_SUCCESS;
2300
char *interfaces_to_take_down = NULL;
2301
size_t interfaces_to_take_down_size = 0;
2302
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2303
char old_tempdir[] = "/tmp/mandosXXXXXX";
2304
char *tempdir = NULL;
2305
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2306
const char *seckey = PATHDIR "/" SECKEY;
2307
const char *pubkey = PATHDIR "/" PUBKEY;
2308
const char *dh_params_file = NULL;
2309
char *interfaces_hooks = NULL;
2311
bool gnutls_initialized = false;
2312
bool gpgme_initialized = false;
2314
double retry_interval = 10; /* 10s between trying a server and
2315
retrying the same server again */
2317
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2318
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2323
/* Lower any group privileges we might have, just to be safe */
2327
perror_plus("setgid");
2330
/* Lower user privileges (temporarily) */
2334
perror_plus("seteuid");
2342
struct argp_option options[] = {
2343
{ .name = "debug", .key = 128,
2344
.doc = "Debug mode", .group = 3 },
2345
{ .name = "connect", .key = 'c',
2346
.arg = "ADDRESS:PORT",
2347
.doc = "Connect directly to a specific Mandos server",
2349
{ .name = "interface", .key = 'i',
2351
.doc = "Network interface that will be used to search for"
2354
{ .name = "seckey", .key = 's',
2356
.doc = "OpenPGP secret key file base name",
2358
{ .name = "pubkey", .key = 'p',
2360
.doc = "OpenPGP public key file base name",
2362
{ .name = "dh-bits", .key = 129,
2364
.doc = "Bit length of the prime number used in the"
2365
" Diffie-Hellman key exchange",
2367
{ .name = "dh-params", .key = 134,
2369
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2370
" for the Diffie-Hellman key exchange",
2372
{ .name = "priority", .key = 130,
2374
.doc = "GnuTLS priority string for the TLS handshake",
2376
{ .name = "delay", .key = 131,
2378
.doc = "Maximum delay to wait for interface startup",
2380
{ .name = "retry", .key = 132,
2382
.doc = "Retry interval used when denied by the Mandos server",
2384
{ .name = "network-hook-dir", .key = 133,
2386
.doc = "Directory where network hooks are located",
2389
* These reproduce what we would get without ARGP_NO_HELP
2391
{ .name = "help", .key = '?',
2392
.doc = "Give this help list", .group = -1 },
2393
{ .name = "usage", .key = -3,
2394
.doc = "Give a short usage message", .group = -1 },
2395
{ .name = "version", .key = 'V',
2396
.doc = "Print program version", .group = -1 },
2400
error_t parse_opt(int key, char *arg,
2401
struct argp_state *state){
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
2404
case 128: /* --debug */
2407
case 'c': /* --connect */
2410
case 'i': /* --interface */
2411
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2414
argp_error(state, "%s", strerror(ret_errno));
2417
case 's': /* --seckey */
2420
case 'p': /* --pubkey */
2423
case 129: /* --dh-bits */
2425
tmpmax = strtoimax(arg, &tmp, 10);
2426
if(errno != 0 or tmp == arg or *tmp != '\0'
2427
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2428
argp_error(state, "Bad number of DH bits");
2430
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
case 134: /* --dh-params */
2433
dh_params_file = arg;
2435
case 130: /* --priority */
2438
case 131: /* --delay */
2440
delay = strtof(arg, &tmp);
2441
if(errno != 0 or tmp == arg or *tmp != '\0'){
2442
argp_error(state, "Bad delay");
2444
case 132: /* --retry */
2446
retry_interval = strtod(arg, &tmp);
2447
if(errno != 0 or tmp == arg or *tmp != '\0'
2448
or (retry_interval * 1000) > INT_MAX
2449
or retry_interval < 0){
2450
argp_error(state, "Bad retry interval");
2453
case 133: /* --network-hook-dir */
2457
* These reproduce what we would get without ARGP_NO_HELP
2459
case '?': /* --help */
2460
argp_state_help(state, state->out_stream,
2461
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2462
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2463
case -3: /* --usage */
2464
argp_state_help(state, state->out_stream,
2465
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2466
case 'V': /* --version */
2467
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2468
exit(argp_err_exit_status);
2471
return ARGP_ERR_UNKNOWN;
2476
struct argp argp = { .options = options, .parser = parse_opt,
2478
.doc = "Mandos client -- Get and decrypt"
2479
" passwords from a Mandos server" };
2480
ret = argp_parse(&argp, argc, argv,
2481
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2488
perror_plus("argp_parse");
2489
exitcode = EX_OSERR;
2492
exitcode = EX_USAGE;
2498
/* Work around Debian bug #633582:
2499
<http://bugs.debian.org/633582> */
2501
/* Re-raise privileges */
2502
ret_errno = raise_privileges();
2505
perror_plus("Failed to raise privileges");
2509
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2510
int seckey_fd = open(seckey, O_RDONLY);
2511
if(seckey_fd == -1){
2512
perror_plus("open");
2514
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
perror_plus("fstat");
2518
if(S_ISREG(st.st_mode)
2519
and st.st_uid == 0 and st.st_gid == 0){
2520
ret = fchown(seckey_fd, uid, gid);
2522
perror_plus("fchown");
2530
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2531
int pubkey_fd = open(pubkey, O_RDONLY);
2532
if(pubkey_fd == -1){
2533
perror_plus("open");
2535
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
perror_plus("fstat");
2539
if(S_ISREG(st.st_mode)
2540
and st.st_uid == 0 and st.st_gid == 0){
2541
ret = fchown(pubkey_fd, uid, gid);
2543
perror_plus("fchown");
2551
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2552
int dhparams_fd = open(dh_params_file, O_RDONLY);
2553
if(dhparams_fd == -1){
2554
perror_plus("open");
2556
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2558
perror_plus("fstat");
2560
if(S_ISREG(st.st_mode)
2561
and st.st_uid == 0 and st.st_gid == 0){
2562
ret = fchown(dhparams_fd, uid, gid);
2564
perror_plus("fchown");
2572
/* Lower privileges */
2573
ret_errno = lower_privileges();
2576
perror_plus("Failed to lower privileges");
2581
/* Remove invalid interface names (except "none") */
2583
char *interface = NULL;
2584
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2586
if(strcmp(interface, "none") != 0
2587
and if_nametoindex(interface) == 0){
2588
if(interface[0] != '\0'){
2589
fprintf_plus(stderr, "Not using nonexisting interface"
2590
" \"%s\"\n", interface);
2592
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2598
/* Run network hooks */
2600
if(mc.interfaces != NULL){
2601
interfaces_hooks = malloc(mc.interfaces_size);
2602
if(interfaces_hooks == NULL){
2603
perror_plus("malloc");
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1013
exitcode = EXIT_FAILURE;
1015
exitcode = EXIT_SUCCESS;
1021
avahi_set_log_function(empty_log);
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
exitcode = EXIT_FAILURE;
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1074
/* Run the main loop */
1077
fprintf(stderr, "Starting Avahi loop search\n");
1080
avahi_simple_poll_loop(mc.simple_poll);
2606
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2607
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2609
run_network_hooks("start", interfaces_hooks != NULL ?
2610
interfaces_hooks : "", delay);
2614
avahi_set_log_function(empty_log);
2617
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2618
from the signal handler */
2619
/* Initialize the pseudo-RNG for Avahi */
2620
srand((unsigned int) time(NULL));
2621
simple_poll = avahi_simple_poll_new();
2622
if(simple_poll == NULL){
2623
fprintf_plus(stderr,
2624
"Avahi: Failed to create simple poll object.\n");
2625
exitcode = EX_UNAVAILABLE;
2629
sigemptyset(&sigterm_action.sa_mask);
2630
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2632
perror_plus("sigaddset");
2633
exitcode = EX_OSERR;
2636
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2638
perror_plus("sigaddset");
2639
exitcode = EX_OSERR;
2642
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2644
perror_plus("sigaddset");
2645
exitcode = EX_OSERR;
2648
/* Need to check if the handler is SIG_IGN before handling:
2649
| [[info:libc:Initial Signal Actions]] |
2650
| [[info:libc:Basic Signal Handling]] |
2652
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2654
perror_plus("sigaction");
2657
if(old_sigterm_action.sa_handler != SIG_IGN){
2658
ret = sigaction(SIGINT, &sigterm_action, NULL);
2660
perror_plus("sigaction");
2661
exitcode = EX_OSERR;
2665
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2667
perror_plus("sigaction");
2670
if(old_sigterm_action.sa_handler != SIG_IGN){
2671
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2673
perror_plus("sigaction");
2674
exitcode = EX_OSERR;
2678
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2680
perror_plus("sigaction");
2683
if(old_sigterm_action.sa_handler != SIG_IGN){
2684
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2686
perror_plus("sigaction");
2687
exitcode = EX_OSERR;
2692
/* If no interfaces were specified, make a list */
2693
if(mc.interfaces == NULL){
2694
struct dirent **direntries = NULL;
2695
/* Look for any good interfaces */
2696
ret = scandir(sys_class_net, &direntries, good_interface,
2699
/* Add all found interfaces to interfaces list */
2700
for(int i = 0; i < ret; ++i){
2701
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2702
direntries[i]->d_name);
2705
perror_plus("argz_add");
2706
free(direntries[i]);
2710
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2711
direntries[i]->d_name);
2713
free(direntries[i]);
2720
fprintf_plus(stderr, "Could not find a network interface\n");
2721
exitcode = EXIT_FAILURE;
2726
/* Bring up interfaces which are down, and remove any "none"s */
2728
char *interface = NULL;
2729
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2731
/* If interface name is "none", stop bringing up interfaces.
2732
Also remove all instances of "none" from the list */
2733
if(strcmp(interface, "none") == 0){
2734
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
while((interface = argz_next(mc.interfaces,
2738
mc.interfaces_size, interface))){
2739
if(strcmp(interface, "none") == 0){
2740
argz_delete(&mc.interfaces, &mc.interfaces_size,
2747
bool interface_was_up = interface_is_up(interface);
2748
errno = bring_up_interface(interface, delay);
2749
if(not interface_was_up){
2751
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2752
" %s\n", interface, strerror(errno));
2754
errno = argz_add(&interfaces_to_take_down,
2755
&interfaces_to_take_down_size,
2758
perror_plus("argz_add");
2763
if(debug and (interfaces_to_take_down == NULL)){
2764
fprintf_plus(stderr, "No interfaces were brought up\n");
2768
/* If we only got one interface, explicitly use only that one */
2769
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2771
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2781
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2783
fprintf_plus(stderr, "init_gnutls_global failed\n");
2784
exitcode = EX_UNAVAILABLE;
2787
gnutls_initialized = true;
2794
/* Try /run/tmp before /tmp */
2795
tempdir = mkdtemp(run_tempdir);
2796
if(tempdir == NULL and errno == ENOENT){
2798
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2799
run_tempdir, old_tempdir);
2801
tempdir = mkdtemp(old_tempdir);
2803
if(tempdir == NULL){
2804
perror_plus("mkdtemp");
2812
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2813
fprintf_plus(stderr, "init_gpgme failed\n");
2814
exitcode = EX_UNAVAILABLE;
2817
gpgme_initialized = true;
2824
if(connect_to != NULL){
2825
/* Connect directly, do not use Zeroconf */
2826
/* (Mainly meant for debugging) */
2827
char *address = strrchr(connect_to, ':');
2829
if(address == NULL){
2830
fprintf_plus(stderr, "No colon in address\n");
2831
exitcode = EX_USAGE;
2841
tmpmax = strtoimax(address+1, &tmp, 10);
2842
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2843
or tmpmax != (in_port_t)tmpmax){
2844
fprintf_plus(stderr, "Bad port number\n");
2845
exitcode = EX_USAGE;
2853
port = (in_port_t)tmpmax;
2855
/* Colon in address indicates IPv6 */
2857
if(strchr(connect_to, ':') != NULL){
2859
/* Accept [] around IPv6 address - see RFC 5952 */
2860
if(connect_to[0] == '[' and address[-1] == ']')
2868
address = connect_to;
2874
while(not quit_now){
2875
ret = start_mandos_communication(address, port, if_index, af,
2877
if(quit_now or ret == 0){
2881
fprintf_plus(stderr, "Retrying in %d seconds\n",
2882
(int)retry_interval);
2884
sleep((unsigned int)retry_interval);
2888
exitcode = EXIT_SUCCESS;
2899
AvahiServerConfig config;
2900
/* Do not publish any local Zeroconf records */
2901
avahi_server_config_init(&config);
2902
config.publish_hinfo = 0;
2903
config.publish_addresses = 0;
2904
config.publish_workstation = 0;
2905
config.publish_domain = 0;
2907
/* Allocate a new server */
2908
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2909
&config, NULL, NULL, &ret_errno);
2911
/* Free the Avahi configuration data */
2912
avahi_server_config_free(&config);
2915
/* Check if creating the Avahi server object succeeded */
2916
if(mc.server == NULL){
2917
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2918
avahi_strerror(ret_errno));
2919
exitcode = EX_UNAVAILABLE;
2927
/* Create the Avahi service browser */
2928
sb = avahi_s_service_browser_new(mc.server, if_index,
2929
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2930
NULL, 0, browse_callback,
2933
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2934
avahi_strerror(avahi_server_errno(mc.server)));
2935
exitcode = EX_UNAVAILABLE;
2943
/* Run the main loop */
2946
fprintf_plus(stderr, "Starting Avahi loop search\n");
2949
ret = avahi_loop_with_timeout(simple_poll,
2950
(int)(retry_interval * 1000), &mc);
2952
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2953
(ret == 0) ? "successfully" : "with error");
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1088
/* Cleanup things */
1090
avahi_s_service_browser_free(sb);
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1128
ret = unlink(fullname);
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1137
ret = rmdir(tempdir);
2959
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2962
/* Cleanup things */
2963
free(mc.interfaces);
2966
avahi_s_service_browser_free(sb);
2968
if(mc.server != NULL)
2969
avahi_server_free(mc.server);
2971
if(simple_poll != NULL)
2972
avahi_simple_poll_free(simple_poll);
2974
if(gnutls_initialized){
2975
gnutls_certificate_free_credentials(mc.cred);
2976
gnutls_global_deinit();
2977
gnutls_dh_params_deinit(mc.dh_params);
2980
if(gpgme_initialized){
2981
gpgme_release(mc.ctx);
2984
/* Cleans up the circular linked list of Mandos servers the client
2986
if(mc.current_server != NULL){
2987
mc.current_server->prev->next = NULL;
2988
while(mc.current_server != NULL){
2989
server *next = mc.current_server->next;
2991
#pragma GCC diagnostic push
2992
#pragma GCC diagnostic ignored "-Wcast-qual"
2994
free((char *)(mc.current_server->ip));
2996
#pragma GCC diagnostic pop
2998
free(mc.current_server);
2999
mc.current_server = next;
3003
/* Re-raise privileges */
3005
ret_errno = raise_privileges();
3008
perror_plus("Failed to raise privileges");
3011
/* Run network hooks */
3012
run_network_hooks("stop", interfaces_hooks != NULL ?
3013
interfaces_hooks : "", delay);
3015
/* Take down the network interfaces which were brought up */
3017
char *interface = NULL;
3018
while((interface=argz_next(interfaces_to_take_down,
3019
interfaces_to_take_down_size,
3021
ret_errno = take_down_interface(interface);
3024
perror_plus("Failed to take down interface");
3027
if(debug and (interfaces_to_take_down == NULL)){
3028
fprintf_plus(stderr, "No interfaces needed to be taken"
3034
ret_errno = lower_privileges_permanently();
3037
perror_plus("Failed to lower privileges permanently");
3041
free(interfaces_to_take_down);
3042
free(interfaces_hooks);
3044
/* Removes the GPGME temp directory and all files inside */
3045
if(tempdir != NULL){
3046
struct dirent **direntries = NULL;
3047
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
if(tempdir_fd == -1){
3052
perror_plus("open");
3055
#if __GLIBC_PREREQ(2, 15)
3056
int numentries = scandirat(tempdir_fd, ".", &direntries,
3057
notdotentries, alphasort);
3058
#else /* not __GLIBC_PREREQ(2, 15) */
3059
int numentries = scandir(tempdir, &direntries, notdotentries,
3061
#endif /* not __GLIBC_PREREQ(2, 15) */
3062
#else /* not __GLIBC__ */
3063
int numentries = scandir(tempdir, &direntries, notdotentries,
3065
#endif /* not __GLIBC__ */
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3070
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3071
" \"%s\", 0): %s\n", tempdir,
3072
direntries[i]->d_name, strerror(errno));
3074
free(direntries[i]);
3077
/* need to clean even if 0 because man page doesn't specify */
3079
if(numentries == -1){
3080
perror_plus("scandir");
3082
ret = rmdir(tempdir);
3083
if(ret == -1 and errno != ENOENT){
3084
perror_plus("rmdir");
3092
sigemptyset(&old_sigterm_action.sa_mask);
3093
old_sigterm_action.sa_handler = SIG_DFL;
3094
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3095
&old_sigterm_action,
3098
perror_plus("sigaction");
3101
ret = raise(signal_received);
3102
} while(ret != 0 and errno == EINTR);
3104
perror_plus("raise");
3107
TEMP_FAILURE_RETRY(pause());