815
496
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
497
__attribute__((unused)) const char *txt){}
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
823
if(seteuid(0) == -1){
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
851
if(seteuid(uid) == -1){
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
863
if(setuid(uid) == -1){
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
874
AvahiIfIndex if_index){
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
913
perror_plus("setgid");
916
/* Reset supplementary groups */
918
ret = setgroups(0, NULL);
920
perror_plus("setgroups");
924
ret = dup2(devnull, STDIN_FILENO);
926
perror_plus("dup2(devnull, STDIN_FILENO)");
929
ret = close(devnull);
931
perror_plus("close");
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
if(helperdir_fd == -1){
946
_exit(EX_UNAVAILABLE);
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
perror_plus("openat");
953
_exit(EX_UNAVAILABLE);
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
965
#pragma GCC diagnostic pop
967
perror_plus("fexecve");
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
987
if(kill(pid, SIGTERM) == -1){
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
996
} while(pret == -1 and errno == EINTR);
998
perror_plus("waitpid");
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
return add_delete_local_route(true, address, if_index);
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
return add_delete_local_route(false, address, if_index);
1036
499
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
500
static int start_mandos_communication(const char *ip, uint16_t port,
1039
501
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
1041
int ret, tcp_sd = -1;
1043
struct sockaddr_storage to;
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1044
506
char *buffer = NULL;
1045
char *decrypted_buffer = NULL;
507
char *decrypted_buffer;
1046
508
size_t buffer_length = 0;
1047
509
size_t buffer_capacity = 0;
510
ssize_t decrypted_buffer_size;
513
char interface[IF_NAMESIZE];
1050
514
gnutls_session_t session;
1051
int pf; /* Protocol family */
1052
bool route_added = false;
1069
fprintf_plus(stderr, "Bad address family: %d\n", af);
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
if_indextoname((unsigned int)if_index,
516
ret = init_gnutls_session (mc, &session);
522
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
526
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(if_indextoname((unsigned int)if_index, interface) == NULL){
534
perror("if_indextoname");
537
fprintf(stderr, "Binding to interface %s\n", interface);
1106
ret = init_gnutls_session(&session, mc);
540
memset(&to, 0, sizeof(to));
541
to.in6.sin6_family = AF_INET6;
542
/* It would be nice to have a way to detect if we were passed an
543
IPv4 address here. Now we assume an IPv6 address. */
544
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1113
PRIuMAX "\n", ip, (uintmax_t)port);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1119
perror_plus("socket");
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
1140
perror_plus("inet_pton");
1146
fprintf_plus(stderr, "Bad address: %s\n", ip);
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1154
if(if_index == AVAHI_IF_UNSPEC){
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
1156
" incomplete without a network interface\n");
1160
/* Set the network interface number as scope */
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
550
fprintf(stderr, "Bad address: %s\n", ip);
553
to.in6.sin6_port = htons(port); /* Spurious warning */
555
to.in6.sin6_scope_id = (uint32_t)if_index;
1173
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1174
char interface[IF_NAMESIZE];
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1176
perror_plus("if_indextoname");
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1239
Avahi bug reference:
1240
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
route_added = add_local_route(ip, if_index);
1254
if(errno != ECONNREFUSED or debug){
1256
perror_plus("connect");
558
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
char addrstr[INET6_ADDRSTRLEN] = "";
561
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
562
sizeof(addrstr)) == NULL){
565
if(strcmp(addrstr, ip) != 0){
566
fprintf(stderr, "Canonical address form: %s\n", addrstr);
571
ret = connect(tcp_sd, &to.in, sizeof(to));
1269
577
const char *out = mandos_protocol_version;
1272
580
size_t out_size = strlen(out);
1273
581
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1274
out_size - written));
1277
perror_plus("write");
582
out_size - written));
1279
586
goto mandos_end;
1281
588
written += (size_t)ret;
1282
589
if(written < out_size){
1285
if(out == mandos_protocol_version){
592
if (out == mandos_protocol_version){
1300
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1308
/* This casting via intptr_t is to eliminate warning about casting
1309
an int to a pointer type. This is exactly how the GnuTLS Guile
1310
function "set-session-transport-fd!" does it. */
1311
gnutls_transport_set_ptr(session,
1312
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1320
ret = gnutls_handshake(session);
602
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
ret = gnutls_handshake (session);
1325
609
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1327
if(ret != GNUTLS_E_SUCCESS){
611
if (ret != GNUTLS_E_SUCCESS){
1329
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
613
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1333
617
goto mandos_end;
1336
620
/* Read OpenPGP packet that contains the wanted password */
1339
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
623
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1350
buffer_capacity = incbuffer(&buffer, buffer_length,
1352
if(buffer_capacity == 0){
1354
perror_plus("incbuffer");
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
if (buffer_capacity == 0){
631
perror("adjustbuffer");
1361
633
goto mandos_end;
1364
636
sret = gnutls_record_recv(session, buffer+buffer_length,
1371
643
case GNUTLS_E_INTERRUPTED:
1372
644
case GNUTLS_E_AGAIN:
1374
646
case GNUTLS_E_REHANDSHAKE:
1376
ret = gnutls_handshake(session);
648
ret = gnutls_handshake (session);
1382
649
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1384
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
651
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1388
654
goto mandos_end;
1392
fprintf_plus(stderr, "Unknown error while reading data from"
1393
" encrypted session with Mandos server\n");
1394
gnutls_bye(session, GNUTLS_SHUT_RDWR);
658
fprintf(stderr, "Unknown error while reading data from"
659
" encrypted session with Mandos server\n");
661
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1396
662
goto mandos_end;
1609
803
case AVAHI_BROWSER_ALL_FOR_NOW:
1610
804
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1612
fprintf_plus(stderr, "No Mandos server found, still"
806
fprintf(stderr, "No Mandos server found, still searching...\n");
1619
/* Signal handler that stops main loop after SIGTERM */
1620
static void handle_sigterm(int sig){
1625
signal_received = sig;
1626
int old_errno = errno;
1627
/* set main loop to exit */
1628
if(simple_poll != NULL){
1629
avahi_simple_poll_quit(simple_poll);
1634
__attribute__((nonnull, warn_unused_result))
1635
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
perror_plus("socket");
1646
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1647
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1648
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
perror_plus("ioctl SIOCGIFFLAGS");
1660
__attribute__((nonnull, warn_unused_result))
1661
bool good_flags(const char *ifname, const struct ifreq *ifr){
1663
/* Reject the loopback device */
1664
if(ifr->ifr_flags & IFF_LOOPBACK){
1666
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1671
/* Accept point-to-point devices only if connect_to is specified */
1672
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1674
fprintf_plus(stderr, "Accepting point-to-point interface"
1675
" \"%s\"\n", ifname);
1679
/* Otherwise, reject non-broadcast-capable devices */
1680
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1682
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1683
" \"%s\"\n", ifname);
1687
/* Reject non-ARP interfaces (including dummy interfaces) */
1688
if(ifr->ifr_flags & IFF_NOARP){
1690
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1696
/* Accept this device */
1698
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1704
* This function determines if a directory entry in /sys/class/net
1705
* corresponds to an acceptable network device.
1706
* (This function is passed to scandir(3) as a filter function.)
1708
__attribute__((nonnull, warn_unused_result))
1709
int good_interface(const struct dirent *if_entry){
1710
if(if_entry->d_name[0] == '.'){
1715
if(not get_flags(if_entry->d_name, &ifr)){
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", if_entry->d_name);
1723
if(not good_flags(if_entry->d_name, &ifr)){
1730
* This function determines if a network interface is up.
1732
__attribute__((nonnull, warn_unused_result))
1733
bool interface_is_up(const char *interface){
1735
if(not get_flags(interface, &ifr)){
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1743
return (bool)(ifr.ifr_flags & IFF_UP);
1747
* This function determines if a network interface is running
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_running(const char *interface){
1752
if(not get_flags(interface, &ifr)){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1760
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
__attribute__((nonnull, pure, warn_unused_result))
1764
int notdotentries(const struct dirent *direntry){
1765
/* Skip "." and ".." */
1766
if(direntry->d_name[0] == '.'
1767
and (direntry->d_name[1] == '\0'
1768
or (direntry->d_name[1] == '.'
1769
and direntry->d_name[2] == '\0'))){
1775
/* Is this directory entry a runnable program? */
1776
__attribute__((nonnull, warn_unused_result))
1777
int runnable_hook(const struct dirent *direntry){
1782
if((direntry->d_name)[0] == '\0'){
1787
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1788
"abcdefghijklmnopqrstuvwxyz"
1791
if((direntry->d_name)[sret] != '\0'){
1792
/* Contains non-allowed characters */
1794
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1800
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1803
perror_plus("Could not stat hook");
1807
if(not (S_ISREG(st.st_mode))){
1808
/* Not a regular file */
1810
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1815
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1816
/* Not executable */
1818
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1824
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1830
__attribute__((nonnull, warn_unused_result))
1831
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1832
mandos_context *mc){
1834
struct timespec now;
1835
struct timespec waited_time;
1836
intmax_t block_time;
1839
if(mc->current_server == NULL){
1841
fprintf_plus(stderr, "Wait until first server is found."
1844
ret = avahi_simple_poll_iterate(s, -1);
1847
fprintf_plus(stderr, "Check current_server if we should run"
1850
/* the current time */
1851
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1853
perror_plus("clock_gettime");
1856
/* Calculating in ms how long time between now and server
1857
who we visted longest time ago. Now - last seen. */
1858
waited_time.tv_sec = (now.tv_sec
1859
- mc->current_server->last_seen.tv_sec);
1860
waited_time.tv_nsec = (now.tv_nsec
1861
- mc->current_server->last_seen.tv_nsec);
1862
/* total time is 10s/10,000ms.
1863
Converting to s from ms by dividing by 1,000,
1864
and ns to ms by dividing by 1,000,000. */
1865
block_time = ((retry_interval
1866
- ((intmax_t)waited_time.tv_sec * 1000))
1867
- ((intmax_t)waited_time.tv_nsec / 1000000));
1870
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
if(block_time <= 0){
1875
ret = start_mandos_communication(mc->current_server->ip,
1876
mc->current_server->port,
1877
mc->current_server->if_index,
1878
mc->current_server->af, mc);
1880
avahi_simple_poll_quit(s);
1883
ret = clock_gettime(CLOCK_MONOTONIC,
1884
&mc->current_server->last_seen);
1886
perror_plus("clock_gettime");
1889
mc->current_server = mc->current_server->next;
1890
block_time = 0; /* Call avahi to find new Mandos
1891
servers, but don't block */
1894
ret = avahi_simple_poll_iterate(s, (int)block_time);
1897
if(ret > 0 or errno != EINTR){
1898
return (ret != 1) ? ret : 0;
1904
__attribute__((nonnull))
1905
void run_network_hooks(const char *mode, const char *interface,
1907
struct dirent **direntries = NULL;
1908
if(hookdir_fd == -1){
1909
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
if(hookdir_fd == -1){
1912
if(errno == ENOENT){
1914
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1915
" found\n", hookdir);
1918
perror_plus("open");
1923
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1924
runnable_hook, alphasort);
1926
perror_plus("scandir");
1929
struct dirent *direntry;
1931
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
for(int i = 0; i < numhooks; i++){
1937
direntry = direntries[i];
1939
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
pid_t hook_pid = fork();
1945
/* Raise privileges */
1946
errno = raise_privileges_permanently();
1948
perror_plus("Failed to raise privileges");
1955
perror_plus("setgid");
1958
/* Reset supplementary groups */
1960
ret = setgroups(0, NULL);
1962
perror_plus("setgroups");
1965
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
perror_plus("setenv");
1970
ret = setenv("DEVICE", interface, 1);
1972
perror_plus("setenv");
1975
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
perror_plus("setenv");
1980
ret = setenv("MODE", mode, 1);
1982
perror_plus("setenv");
1986
ret = asprintf(&delaystring, "%f", (double)delay);
1988
perror_plus("asprintf");
1991
ret = setenv("DELAY", delaystring, 1);
1994
perror_plus("setenv");
1998
if(connect_to != NULL){
1999
ret = setenv("CONNECT", connect_to, 1);
2001
perror_plus("setenv");
2005
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
perror_plus("openat");
2010
_exit(EXIT_FAILURE);
2012
if(close(hookdir_fd) == -1){
2013
perror_plus("close");
2014
_exit(EXIT_FAILURE);
2016
ret = dup2(devnull, STDIN_FILENO);
2018
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
ret = close(devnull);
2023
perror_plus("close");
2026
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
perror_plus("fexecve");
2034
_exit(EXIT_FAILURE);
2038
perror_plus("fork");
2043
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2044
perror_plus("waitpid");
2048
if(WIFEXITED(status)){
2049
if(WEXITSTATUS(status) != 0){
2050
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2051
" with status %d\n", direntry->d_name,
2052
WEXITSTATUS(status));
2056
} else if(WIFSIGNALED(status)){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2058
" signal %d\n", direntry->d_name,
2063
fprintf_plus(stderr, "Warning: network hook \"%s\""
2064
" crashed\n", direntry->d_name);
2070
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2076
if(close(hookdir_fd) == -1){
2077
perror_plus("close");
2084
__attribute__((nonnull, warn_unused_result))
2085
int bring_up_interface(const char *const interface,
2087
int old_errno = errno;
2089
struct ifreq network;
2090
unsigned int if_index = if_nametoindex(interface);
2092
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2102
if(not interface_is_up(interface)){
2104
int ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2112
network.ifr_flags |= IFF_UP; /* set flag */
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
perror_plus("socket");
2125
perror_plus("close");
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2140
perror_plus("Failed to raise privileges");
2145
bool restore_loglevel = false;
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2153
restore_loglevel = true;
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2166
#endif /* __linux__ */
2168
/* If raise_privileges() succeeded above */
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2174
perror_plus("Failed to lower privileges");
2178
/* Close the socket */
2181
perror_plus("close");
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2212
__attribute__((nonnull, warn_unused_result))
2213
int take_down_interface(const char *const interface){
2214
int old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
if(interface_is_up(interface)){
2224
int ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
perror_plus("socket");
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2251
perror_plus("Failed to raise privileges");
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2257
/* If raise_privileges() succeeded above */
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2263
perror_plus("Failed to lower privileges");
2267
/* Close the socket */
2268
int ret = close(sd);
2270
perror_plus("close");
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2288
812
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509"
2291
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2292
.current_server = NULL, .interfaces = NULL,
2293
.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){
813
AvahiSServiceBrowser *sb = NULL;
816
int exitcode = EXIT_SUCCESS;
817
const char *interface = "eth0";
818
struct ifreq network;
822
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
824
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
828
mandos_context mc = { .simple_poll = NULL, .server = NULL,
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
835
struct argp_option options[] = {
836
{ .name = "debug", .key = 128,
837
.doc = "Debug mode", .group = 3 },
838
{ .name = "connect", .key = 'c',
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
842
{ .name = "interface", .key = 'i',
844
.doc = "Interface that will be used to search for Mandos"
847
{ .name = "seckey", .key = 's',
849
.doc = "OpenPGP secret key file base name",
851
{ .name = "pubkey", .key = 'p',
853
.doc = "OpenPGP public key file base name",
855
{ .name = "dh-bits", .key = 129,
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
860
{ .name = "priority", .key = 130,
862
.doc = "GnuTLS priority string for the TLS handshake",
867
error_t parse_opt (int key, char *arg,
868
struct argp_state *state) {
869
/* Get the INPUT argument from `argp_parse', which we know is
870
a pointer to our plugin list pointer. */
872
case 128: /* --debug */
875
case 'c': /* --connect */
878
case 'i': /* --interface */
881
case 's': /* --seckey */
884
case 'p': /* --pubkey */
887
case 129: /* --dh-bits */
889
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
895
case 130: /* --priority */
903
return ARGP_ERR_UNKNOWN;
908
struct argp argp = { .options = options, .parser = parse_opt,
910
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
913
if (ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
920
/* If the interface is down, bring it up */
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
exitcode = EXIT_FAILURE;
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
963
ret = init_gnutls_global(&mc, pubkey, seckey);
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
969
gnutls_initalized = true;
972
if(mkdtemp(tempdir) == NULL){
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
983
gpgme_initalized = true;
986
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
fprintf(stderr, "No such interface: \"%s\"\n", interface);
992
if(connect_to != NULL){
993
/* Connect directly, do not use Zeroconf */
994
/* (Mainly meant for debugging) */
995
char *address = strrchr(connect_to, ':');
997
fprintf(stderr, "No colon in address\n");
998
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_errno = 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
<https://bugs.debian.org/633582> */
2501
/* Re-raise privileges */
2502
ret = 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(dh_params_file != NULL
2552
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2553
int dhparams_fd = open(dh_params_file, O_RDONLY);
2554
if(dhparams_fd == -1){
2555
perror_plus("open");
2557
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
perror_plus("fstat");
2561
if(S_ISREG(st.st_mode)
2562
and st.st_uid == 0 and st.st_gid == 0){
2563
ret = fchown(dhparams_fd, uid, gid);
2565
perror_plus("fchown");
2573
/* Lower privileges */
2574
ret = lower_privileges();
2577
perror_plus("Failed to lower privileges");
2582
/* Remove invalid interface names (except "none") */
2584
char *interface = NULL;
2585
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
if(strcmp(interface, "none") != 0
2588
and if_nametoindex(interface) == 0){
2589
if(interface[0] != '\0'){
2590
fprintf_plus(stderr, "Not using nonexisting interface"
2591
" \"%s\"\n", interface);
2593
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2599
/* Run network hooks */
2601
if(mc.interfaces != NULL){
2602
interfaces_hooks = malloc(mc.interfaces_size);
2603
if(interfaces_hooks == NULL){
2604
perror_plus("malloc");
1002
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
perror("Bad port number");
1005
exitcode = EXIT_FAILURE;
2607
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2608
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
run_network_hooks("start", interfaces_hooks != NULL ?
2611
interfaces_hooks : "", delay);
2615
avahi_set_log_function(empty_log);
2618
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2619
from the signal handler */
2620
/* Initialize the pseudo-RNG for Avahi */
2621
srand((unsigned int) time(NULL));
2622
simple_poll = avahi_simple_poll_new();
2623
if(simple_poll == NULL){
2624
fprintf_plus(stderr,
2625
"Avahi: Failed to create simple poll object.\n");
2626
exitcode = EX_UNAVAILABLE;
2630
sigemptyset(&sigterm_action.sa_mask);
2631
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2633
perror_plus("sigaddset");
2634
exitcode = EX_OSERR;
2637
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2639
perror_plus("sigaddset");
2640
exitcode = EX_OSERR;
2643
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2645
perror_plus("sigaddset");
2646
exitcode = EX_OSERR;
2649
/* Need to check if the handler is SIG_IGN before handling:
2650
| [[info:libc:Initial Signal Actions]] |
2651
| [[info:libc:Basic Signal Handling]] |
2653
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2655
perror_plus("sigaction");
2658
if(old_sigterm_action.sa_handler != SIG_IGN){
2659
ret = sigaction(SIGINT, &sigterm_action, NULL);
2661
perror_plus("sigaction");
2662
exitcode = EX_OSERR;
2666
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2668
perror_plus("sigaction");
2671
if(old_sigterm_action.sa_handler != SIG_IGN){
2672
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2674
perror_plus("sigaction");
2675
exitcode = EX_OSERR;
2679
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2681
perror_plus("sigaction");
2684
if(old_sigterm_action.sa_handler != SIG_IGN){
2685
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2687
perror_plus("sigaction");
2688
exitcode = EX_OSERR;
2693
/* If no interfaces were specified, make a list */
2694
if(mc.interfaces == NULL){
2695
struct dirent **direntries = NULL;
2696
/* Look for any good interfaces */
2697
ret = scandir(sys_class_net, &direntries, good_interface,
2700
/* Add all found interfaces to interfaces list */
2701
for(int i = 0; i < ret; ++i){
2702
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2703
direntries[i]->d_name);
2706
perror_plus("argz_add");
2707
free(direntries[i]);
2711
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2712
direntries[i]->d_name);
2714
free(direntries[i]);
2721
fprintf_plus(stderr, "Could not find a network interface\n");
2722
exitcode = EXIT_FAILURE;
2727
/* Bring up interfaces which are down, and remove any "none"s */
2729
char *interface = NULL;
2730
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
/* If interface name is "none", stop bringing up interfaces.
2733
Also remove all instances of "none" from the list */
2734
if(strcmp(interface, "none") == 0){
2735
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
while((interface = argz_next(mc.interfaces,
2739
mc.interfaces_size, interface))){
2740
if(strcmp(interface, "none") == 0){
2741
argz_delete(&mc.interfaces, &mc.interfaces_size,
2748
bool interface_was_up = interface_is_up(interface);
2749
errno = bring_up_interface(interface, delay);
2750
if(not interface_was_up){
2752
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2753
" %s\n", interface, strerror(errno));
2755
errno = argz_add(&interfaces_to_take_down,
2756
&interfaces_to_take_down_size,
2759
perror_plus("argz_add");
2764
if(debug and (interfaces_to_take_down == NULL)){
2765
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
/* If we only got one interface, explicitly use only that one */
2770
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2782
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2784
fprintf_plus(stderr, "init_gnutls_global failed\n");
2785
exitcode = EX_UNAVAILABLE;
2788
gnutls_initialized = true;
2795
/* Try /run/tmp before /tmp */
2796
tempdir = mkdtemp(run_tempdir);
2797
if(tempdir == NULL and errno == ENOENT){
2799
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2800
run_tempdir, old_tempdir);
2802
tempdir = mkdtemp(old_tempdir);
2804
if(tempdir == NULL){
2805
perror_plus("mkdtemp");
2813
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2814
fprintf_plus(stderr, "init_gpgme failed\n");
2815
exitcode = EX_UNAVAILABLE;
2818
gpgme_initialized = true;
2825
if(connect_to != NULL){
2826
/* Connect directly, do not use Zeroconf */
2827
/* (Mainly meant for debugging) */
2828
char *address = strrchr(connect_to, ':');
2830
if(address == NULL){
2831
fprintf_plus(stderr, "No colon in address\n");
2832
exitcode = EX_USAGE;
2842
tmpmax = strtoimax(address+1, &tmp, 10);
2843
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2844
or tmpmax != (in_port_t)tmpmax){
2845
fprintf_plus(stderr, "Bad port number\n");
2846
exitcode = EX_USAGE;
2854
port = (in_port_t)tmpmax;
2856
/* Colon in address indicates IPv6 */
2858
if(strchr(connect_to, ':') != NULL){
2860
/* Accept [] around IPv6 address - see RFC 5952 */
2861
if(connect_to[0] == '[' and address[-1] == ']')
2869
address = connect_to;
2875
while(not quit_now){
2876
ret = start_mandos_communication(address, port, if_index, af,
2878
if(quit_now or ret == 0){
2882
fprintf_plus(stderr, "Retrying in %d seconds\n",
2883
(int)retry_interval);
2885
sleep((unsigned int)retry_interval);
2889
exitcode = EXIT_SUCCESS;
2900
AvahiServerConfig config;
2901
/* Do not publish any local Zeroconf records */
2902
avahi_server_config_init(&config);
2903
config.publish_hinfo = 0;
2904
config.publish_addresses = 0;
2905
config.publish_workstation = 0;
2906
config.publish_domain = 0;
2908
/* Allocate a new server */
2909
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2910
&config, NULL, NULL, &ret);
2912
/* Free the Avahi configuration data */
2913
avahi_server_config_free(&config);
2916
/* Check if creating the Avahi server object succeeded */
2917
if(mc.server == NULL){
2918
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2919
avahi_strerror(ret));
2920
exitcode = EX_UNAVAILABLE;
2928
/* Create the Avahi service browser */
2929
sb = avahi_s_service_browser_new(mc.server, if_index,
2930
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2931
NULL, 0, browse_callback,
2934
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2935
avahi_strerror(avahi_server_errno(mc.server)));
2936
exitcode = EX_UNAVAILABLE;
2944
/* Run the main loop */
2947
fprintf_plus(stderr, "Starting Avahi loop search\n");
2950
ret = avahi_loop_with_timeout(simple_poll,
2951
(int)(retry_interval * 1000), &mc);
2953
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2954
(ret == 0) ? "successfully" : "with error");
1009
address = connect_to;
1010
ret = start_mandos_communication(address, port, if_index, &mc);
1012
exitcode = EXIT_FAILURE;
1014
exitcode = EXIT_SUCCESS;
1020
avahi_set_log_function(empty_log);
1023
/* Initialize the pseudo-RNG for Avahi */
1024
srand((unsigned int) time(NULL));
1026
/* Allocate main Avahi loop object */
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if (mc.simple_poll == NULL) {
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
exitcode = EXIT_FAILURE;
1036
AvahiServerConfig config;
1037
/* Do not publish any local Zeroconf records */
1038
avahi_server_config_init(&config);
1039
config.publish_hinfo = 0;
1040
config.publish_addresses = 0;
1041
config.publish_workstation = 0;
1042
config.publish_domain = 0;
1044
/* Allocate a new server */
1045
mc.server = avahi_server_new(avahi_simple_poll_get
1046
(mc.simple_poll), &config, NULL,
1049
/* Free the Avahi configuration data */
1050
avahi_server_config_free(&config);
1053
/* Check if creating the Avahi server object succeeded */
1054
if (mc.server == NULL) {
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
avahi_strerror(error));
1057
exitcode = EXIT_FAILURE;
1061
/* Create the Avahi service browser */
1062
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
"_mandos._tcp", NULL, 0,
1065
browse_callback, &mc);
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
exitcode = EXIT_FAILURE;
1073
/* Run the main loop */
1076
fprintf(stderr, "Starting Avahi loop search\n");
1079
avahi_simple_poll_loop(mc.simple_poll);
2960
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2963
/* Cleanup things */
2964
free(mc.interfaces);
2967
avahi_s_service_browser_free(sb);
2969
if(mc.server != NULL)
2970
avahi_server_free(mc.server);
2972
if(simple_poll != NULL)
2973
avahi_simple_poll_free(simple_poll);
2975
if(gnutls_initialized){
2976
gnutls_certificate_free_credentials(mc.cred);
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 = 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 = 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 = lower_privileges_permanently();
3037
perror_plus("Failed to lower privileges permanently");
3041
free(interfaces_to_take_down);
3042
free(interfaces_hooks);
3044
void clean_dir_at(int base, const char * const dirname,
3046
struct dirent **direntries = NULL;
3048
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3054
perror_plus("open");
3056
int numentries = scandirat(dir_fd, ".", &direntries,
3057
notdotentries, alphasort);
3058
if(numentries >= 0){
3059
for(int i = 0; i < numentries; i++){
3061
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3062
dirname, direntries[i]->d_name);
3064
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3066
if(errno == EISDIR){
3067
dret = unlinkat(dir_fd, direntries[i]->d_name,
3070
if((dret == -1) and (errno == ENOTEMPTY)
3071
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3072
== 0) and (level == 0)){
3073
/* Recurse only in this special case */
3074
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3078
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3079
direntries[i]->d_name, strerror(errno));
3082
free(direntries[i]);
3085
/* need to clean even if 0 because man page doesn't specify */
3087
if(numentries == -1){
3088
perror_plus("scandirat");
3090
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3091
if(dret == -1 and errno != ENOENT){
3092
perror_plus("rmdir");
3095
perror_plus("scandirat");
3100
/* Removes the GPGME temp directory and all files inside */
3101
if(tempdir != NULL){
3102
clean_dir_at(-1, tempdir, 0);
3106
sigemptyset(&old_sigterm_action.sa_mask);
3107
old_sigterm_action.sa_handler = SIG_DFL;
3108
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3109
&old_sigterm_action,
3112
perror_plus("sigaction");
3115
ret = raise(signal_received);
3116
} while(ret != 0 and errno == EINTR);
3118
perror_plus("raise");
3121
TEMP_FAILURE_RETRY(pause());
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1087
/* Cleanup things */
1089
avahi_s_service_browser_free(sb);
1091
if (mc.server != NULL)
1092
avahi_server_free(mc.server);
1094
if (mc.simple_poll != NULL)
1095
avahi_simple_poll_free(mc.simple_poll);
1097
if (gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit ();
1100
gnutls_dh_params_deinit(mc.dh_params);
1103
if(gpgme_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));
1138
ret = rmdir(tempdir);