819
503
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
504
__attribute__((unused)) const char *txt){}
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
827
if(seteuid(0) == -1){
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
855
if(seteuid(uid) == -1){
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
867
if(setuid(uid) == -1){
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
878
AvahiIfIndex if_index){
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
917
perror_plus("setgid");
920
/* Reset supplementary groups */
922
ret = setgroups(0, NULL);
924
perror_plus("setgroups");
928
ret = dup2(devnull, STDIN_FILENO);
930
perror_plus("dup2(devnull, STDIN_FILENO)");
933
ret = close(devnull);
935
perror_plus("close");
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
948
if(helperdir_fd == -1){
950
_exit(EX_UNAVAILABLE);
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
955
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
969
#pragma GCC diagnostic pop
971
perror_plus("fexecve");
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
991
if(kill(pid, SIGTERM) == -1){
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
1000
} while(pret == -1 and errno == EINTR);
1002
perror_plus("waitpid");
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
return add_delete_local_route(true, address, if_index);
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
return add_delete_local_route(false, address, if_index);
1040
506
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
507
static int start_mandos_communication(const char *ip, uint16_t port,
1043
508
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
1045
int ret, tcp_sd = -1;
1047
struct sockaddr_storage to;
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1048
513
char *buffer = NULL;
1049
char *decrypted_buffer = NULL;
514
char *decrypted_buffer;
1050
515
size_t buffer_length = 0;
1051
516
size_t buffer_capacity = 0;
517
ssize_t decrypted_buffer_size;
520
char interface[IF_NAMESIZE];
1054
521
gnutls_session_t session;
1055
int pf; /* Protocol family */
1056
bool route_added = false;
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1083
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
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,
523
ret = init_gnutls_session(mc, &session);
529
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
533
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
540
if(if_indextoname((unsigned int)if_index, interface) == NULL){
541
perror("if_indextoname");
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);
544
fprintf(stderr, "Binding to interface %s\n", interface);
547
memset(&to, 0, sizeof(to));
548
to.in6.sin6_family = AF_INET6;
549
/* It would be nice to have a way to detect if we were passed an
550
IPv4 address here. Now we assume an IPv6 address. */
551
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1145
perror_plus("inet_pton");
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);
557
fprintf(stderr, "Bad address: %s\n", ip);
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
562
-Wunreachable-code */
564
to.in6.sin6_scope_id = (uint32_t)if_index;
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) or (errno == EHOSTUNREACH))
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
https://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");
567
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
569
char addrstr[INET6_ADDRSTRLEN] = "";
570
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
571
sizeof(addrstr)) == NULL){
574
if(strcmp(addrstr, ip) != 0){
575
fprintf(stderr, "Canonical address form: %s\n", addrstr);
580
ret = connect(tcp_sd, &to.in, sizeof(to));
1274
586
const char *out = mandos_protocol_version;
1613
812
case AVAHI_BROWSER_ALL_FOR_NOW:
1614
813
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1616
fprintf_plus(stderr, "No Mandos server found, still"
815
fprintf(stderr, "No Mandos server found, still searching...\n");
1623
/* Signal handler that stops main loop after SIGTERM */
1624
static void handle_sigterm(int sig){
1629
signal_received = sig;
1630
int old_errno = errno;
1631
/* set main loop to exit */
1632
if(simple_poll != NULL){
1633
avahi_simple_poll_quit(simple_poll);
1638
__attribute__((nonnull, warn_unused_result))
1639
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
perror_plus("socket");
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1652
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
perror_plus("ioctl SIOCGIFFLAGS");
1666
__attribute__((nonnull, warn_unused_result))
1667
bool good_flags(const char *ifname, const struct ifreq *ifr){
1669
/* Reject the loopback device */
1670
if(ifr->ifr_flags & IFF_LOOPBACK){
1672
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1677
/* Accept point-to-point devices only if connect_to is specified */
1678
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1680
fprintf_plus(stderr, "Accepting point-to-point interface"
1681
" \"%s\"\n", ifname);
1685
/* Otherwise, reject non-broadcast-capable devices */
1686
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1688
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1689
" \"%s\"\n", ifname);
1693
/* Reject non-ARP interfaces (including dummy interfaces) */
1694
if(ifr->ifr_flags & IFF_NOARP){
1696
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1702
/* Accept this device */
1704
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1710
* This function determines if a directory entry in /sys/class/net
1711
* corresponds to an acceptable network device.
1712
* (This function is passed to scandir(3) as a filter function.)
1714
__attribute__((nonnull, warn_unused_result))
1715
int good_interface(const struct dirent *if_entry){
1716
if(if_entry->d_name[0] == '.'){
1721
if(not get_flags(if_entry->d_name, &ifr)){
1723
fprintf_plus(stderr, "Failed to get flags for interface "
1724
"\"%s\"\n", if_entry->d_name);
1729
if(not good_flags(if_entry->d_name, &ifr)){
1736
* This function determines if a network interface is up.
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_up(const char *interface){
1741
if(not get_flags(interface, &ifr)){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1749
return (bool)(ifr.ifr_flags & IFF_UP);
1753
* This function determines if a network interface is running
1755
__attribute__((nonnull, warn_unused_result))
1756
bool interface_is_running(const char *interface){
1758
if(not get_flags(interface, &ifr)){
1760
fprintf_plus(stderr, "Failed to get flags for interface "
1761
"\"%s\"\n", interface);
1766
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1769
__attribute__((nonnull, pure, warn_unused_result))
1770
int notdotentries(const struct dirent *direntry){
1771
/* Skip "." and ".." */
1772
if(direntry->d_name[0] == '.'
1773
and (direntry->d_name[1] == '\0'
1774
or (direntry->d_name[1] == '.'
1775
and direntry->d_name[2] == '\0'))){
1781
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1783
int runnable_hook(const struct dirent *direntry){
1788
if((direntry->d_name)[0] == '\0'){
1793
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1794
"abcdefghijklmnopqrstuvwxyz"
1797
if((direntry->d_name)[sret] != '\0'){
1798
/* Contains non-allowed characters */
1800
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1809
perror_plus("Could not stat hook");
1813
if(not (S_ISREG(st.st_mode))){
1814
/* Not a regular file */
1816
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1821
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1822
/* Not executable */
1824
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1830
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1836
__attribute__((nonnull, warn_unused_result))
1837
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1838
mandos_context *mc){
1840
struct timespec now;
1841
struct timespec waited_time;
1842
intmax_t block_time;
1845
if(mc->current_server == NULL){
1847
fprintf_plus(stderr, "Wait until first server is found."
1850
ret = avahi_simple_poll_iterate(s, -1);
1853
fprintf_plus(stderr, "Check current_server if we should run"
1856
/* the current time */
1857
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1859
perror_plus("clock_gettime");
1862
/* Calculating in ms how long time between now and server
1863
who we visted longest time ago. Now - last seen. */
1864
waited_time.tv_sec = (now.tv_sec
1865
- mc->current_server->last_seen.tv_sec);
1866
waited_time.tv_nsec = (now.tv_nsec
1867
- mc->current_server->last_seen.tv_nsec);
1868
/* total time is 10s/10,000ms.
1869
Converting to s from ms by dividing by 1,000,
1870
and ns to ms by dividing by 1,000,000. */
1871
block_time = ((retry_interval
1872
- ((intmax_t)waited_time.tv_sec * 1000))
1873
- ((intmax_t)waited_time.tv_nsec / 1000000));
1876
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1880
if(block_time <= 0){
1881
ret = start_mandos_communication(mc->current_server->ip,
1882
mc->current_server->port,
1883
mc->current_server->if_index,
1884
mc->current_server->af, mc);
1886
avahi_simple_poll_quit(s);
1889
ret = clock_gettime(CLOCK_MONOTONIC,
1890
&mc->current_server->last_seen);
1892
perror_plus("clock_gettime");
1895
mc->current_server = mc->current_server->next;
1896
block_time = 0; /* Call avahi to find new Mandos
1897
servers, but don't block */
1900
ret = avahi_simple_poll_iterate(s, (int)block_time);
1903
if(ret > 0 or errno != EINTR){
1904
return (ret != 1) ? ret : 0;
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1924
perror_plus("open");
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1937
perror_plus("scandir");
1941
struct dirent *direntry;
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1949
pid_t hook_pid = fork();
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1955
perror_plus("Failed to raise privileges");
1962
perror_plus("setgid");
1965
/* Reset supplementary groups */
1967
ret = setgroups(0, NULL);
1969
perror_plus("setgroups");
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1974
perror_plus("setenv");
1977
ret = setenv("DEVICE", interface, 1);
1979
perror_plus("setenv");
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1984
perror_plus("setenv");
1987
ret = setenv("MODE", mode, 1);
1989
perror_plus("setenv");
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1995
perror_plus("asprintf");
1998
ret = setenv("DELAY", delaystring, 1);
2001
perror_plus("setenv");
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2008
perror_plus("setenv");
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2023
ret = dup2(devnull, STDIN_FILENO);
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2028
ret = close(devnull);
2030
perror_plus("close");
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2045
perror_plus("fork");
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2094
int old_errno = errno;
2096
struct ifreq network;
2097
unsigned int if_index = if_nametoindex(interface);
2099
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2109
if(not interface_is_up(interface)){
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
2114
fprintf_plus(stderr, "Failed to get flags for interface "
2115
"\"%s\"\n", interface);
2119
network.ifr_flags |= IFF_UP; /* set flag */
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2124
perror_plus("socket");
2132
perror_plus("close");
2139
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2143
/* Raise privileges */
2144
ret_errno = raise_privileges();
2147
perror_plus("Failed to raise privileges");
2152
bool restore_loglevel = false;
2154
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2155
messages about the network interface to mess up the prompt */
2156
ret_linux = klogctl(8, NULL, 5);
2157
if(ret_linux == -1){
2158
perror_plus("klogctl");
2160
restore_loglevel = true;
2163
#endif /* __linux__ */
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
2167
if(restore_loglevel){
2168
ret_linux = klogctl(7, NULL, 0);
2169
if(ret_linux == -1){
2170
perror_plus("klogctl");
2173
#endif /* __linux__ */
2175
/* If raise_privileges() succeeded above */
2177
/* Lower privileges */
2178
ret_errno = lower_privileges();
2181
perror_plus("Failed to lower privileges");
2185
/* Close the socket */
2188
perror_plus("close");
2191
if(ret_setflags == -1){
2192
errno = ioctl_errno;
2193
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2198
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2202
/* Sleep checking until interface is running.
2203
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
2205
if(interface_is_running(interface)){
2208
struct timespec sleeptime = { .tv_nsec = 250000000 };
2209
ret = nanosleep(&sleeptime, NULL);
2210
if(ret == -1 and errno != EINTR){
2211
perror_plus("nanosleep");
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
2222
struct ifreq network;
2223
unsigned int if_index = if_nametoindex(interface);
2225
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2229
if(interface_is_up(interface)){
2231
int ioctl_errno = 0;
2232
if(not get_flags(interface, &network) and debug){
2234
fprintf_plus(stderr, "Failed to get flags for interface "
2235
"\"%s\"\n", interface);
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2241
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2244
perror_plus("socket");
2250
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2254
/* Raise privileges */
2255
ret_errno = raise_privileges();
2258
perror_plus("Failed to raise privileges");
2261
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
2264
/* If raise_privileges() succeeded above */
2266
/* Lower privileges */
2267
ret_errno = lower_privileges();
2270
perror_plus("Failed to lower privileges");
2274
/* Close the socket */
2275
int ret = close(sd);
2277
perror_plus("close");
2280
if(ret_setflags == -1){
2281
errno = ioctl_errno;
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2287
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2295
821
int main(int argc, char *argv[]){
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
2301
AvahiSServiceBrowser *sb = NULL;
2306
int exitcode = EXIT_SUCCESS;
2307
char *interfaces_to_take_down = NULL;
2308
size_t interfaces_to_take_down_size = 0;
2309
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2310
char old_tempdir[] = "/tmp/mandosXXXXXX";
2311
char *tempdir = NULL;
2312
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2313
const char *seckey = PATHDIR "/" SECKEY;
2314
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
char *interfaces_hooks = NULL;
2318
bool gnutls_initialized = false;
2319
bool gpgme_initialized = false;
2321
double retry_interval = 10; /* 10s between trying a server and
2322
retrying the same server again */
2324
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2325
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2330
/* Lower any group privileges we might have, just to be safe */
2334
perror_plus("setgid");
2337
/* Lower user privileges (temporarily) */
2341
perror_plus("seteuid");
2349
struct argp_option options[] = {
2350
{ .name = "debug", .key = 128,
2351
.doc = "Debug mode", .group = 3 },
2352
{ .name = "connect", .key = 'c',
2353
.arg = "ADDRESS:PORT",
2354
.doc = "Connect directly to a specific Mandos server",
2356
{ .name = "interface", .key = 'i',
2358
.doc = "Network interface that will be used to search for"
2361
{ .name = "seckey", .key = 's',
2363
.doc = "OpenPGP secret key file base name",
2365
{ .name = "pubkey", .key = 'p',
2367
.doc = "OpenPGP public key file base name",
2369
{ .name = "dh-bits", .key = 129,
2371
.doc = "Bit length of the prime number used in the"
2372
" Diffie-Hellman key exchange",
2374
{ .name = "dh-params", .key = 134,
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2379
{ .name = "priority", .key = 130,
2381
.doc = "GnuTLS priority string for the TLS handshake",
2383
{ .name = "delay", .key = 131,
2385
.doc = "Maximum delay to wait for interface startup",
2387
{ .name = "retry", .key = 132,
2389
.doc = "Retry interval used when denied by the Mandos server",
2391
{ .name = "network-hook-dir", .key = 133,
2393
.doc = "Directory where network hooks are located",
2396
* These reproduce what we would get without ARGP_NO_HELP
2398
{ .name = "help", .key = '?',
2399
.doc = "Give this help list", .group = -1 },
2400
{ .name = "usage", .key = -3,
2401
.doc = "Give a short usage message", .group = -1 },
2402
{ .name = "version", .key = 'V',
2403
.doc = "Print program version", .group = -1 },
2407
error_t parse_opt(int key, char *arg,
2408
struct argp_state *state){
2411
case 128: /* --debug */
2414
case 'c': /* --connect */
2417
case 'i': /* --interface */
2418
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2421
argp_error(state, "%s", strerror(ret_errno));
2424
case 's': /* --seckey */
2427
case 'p': /* --pubkey */
2430
case 129: /* --dh-bits */
2432
tmpmax = strtoimax(arg, &tmp, 10);
2433
if(errno != 0 or tmp == arg or *tmp != '\0'
2434
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2435
argp_error(state, "Bad number of DH bits");
2437
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2442
case 130: /* --priority */
2445
case 131: /* --delay */
2447
delay = strtof(arg, &tmp);
2448
if(errno != 0 or tmp == arg or *tmp != '\0'){
2449
argp_error(state, "Bad delay");
2451
case 132: /* --retry */
2453
retry_interval = strtod(arg, &tmp);
2454
if(errno != 0 or tmp == arg or *tmp != '\0'
2455
or (retry_interval * 1000) > INT_MAX
2456
or retry_interval < 0){
2457
argp_error(state, "Bad retry interval");
2460
case 133: /* --network-hook-dir */
2464
* These reproduce what we would get without ARGP_NO_HELP
2466
case '?': /* --help */
2467
argp_state_help(state, state->out_stream,
2468
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2469
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2470
case -3: /* --usage */
2471
argp_state_help(state, state->out_stream,
2472
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2473
case 'V': /* --version */
2474
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2475
exit(argp_err_exit_status);
2478
return ARGP_ERR_UNKNOWN;
2483
struct argp argp = { .options = options, .parser = parse_opt,
2485
.doc = "Mandos client -- Get and decrypt"
2486
" passwords from a Mandos server" };
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2495
perror_plus("argp_parse");
2496
exitcode = EX_OSERR;
2499
exitcode = EX_USAGE;
2505
/* Work around Debian bug #633582:
2506
<https://bugs.debian.org/633582> */
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2512
perror_plus("Failed to raise privileges");
2516
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2517
int seckey_fd = open(seckey, O_RDONLY);
2518
if(seckey_fd == -1){
2519
perror_plus("open");
2521
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2523
perror_plus("fstat");
2525
if(S_ISREG(st.st_mode)
2526
and st.st_uid == 0 and st.st_gid == 0){
2527
ret = fchown(seckey_fd, uid, gid);
2529
perror_plus("fchown");
2537
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2538
int pubkey_fd = open(pubkey, O_RDONLY);
2539
if(pubkey_fd == -1){
2540
perror_plus("open");
2542
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2544
perror_plus("fstat");
2546
if(S_ISREG(st.st_mode)
2547
and st.st_uid == 0 and st.st_gid == 0){
2548
ret = fchown(pubkey_fd, uid, gid);
2550
perror_plus("fchown");
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2566
perror_plus("fstat");
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2572
perror_plus("fchown");
2580
/* Lower privileges */
2581
ret = lower_privileges();
2584
perror_plus("Failed to lower privileges");
2589
/* Remove invalid interface names (except "none") */
2591
char *interface = NULL;
2592
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2594
if(strcmp(interface, "none") != 0
2595
and if_nametoindex(interface) == 0){
2596
if(interface[0] != '\0'){
2597
fprintf_plus(stderr, "Not using nonexisting interface"
2598
" \"%s\"\n", interface);
2600
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2606
/* Run network hooks */
2608
if(mc.interfaces != NULL){
2609
interfaces_hooks = malloc(mc.interfaces_size);
2610
if(interfaces_hooks == NULL){
2611
perror_plus("malloc");
2614
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
2622
avahi_set_log_function(empty_log);
2625
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2626
from the signal handler */
2627
/* Initialize the pseudo-RNG for Avahi */
2628
srand((unsigned int) time(NULL));
2629
simple_poll = avahi_simple_poll_new();
2630
if(simple_poll == NULL){
2631
fprintf_plus(stderr,
2632
"Avahi: Failed to create simple poll object.\n");
2633
exitcode = EX_UNAVAILABLE;
2637
sigemptyset(&sigterm_action.sa_mask);
2638
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2640
perror_plus("sigaddset");
2641
exitcode = EX_OSERR;
2644
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2646
perror_plus("sigaddset");
2647
exitcode = EX_OSERR;
2650
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2652
perror_plus("sigaddset");
2653
exitcode = EX_OSERR;
2656
/* Need to check if the handler is SIG_IGN before handling:
2657
| [[info:libc:Initial Signal Actions]] |
2658
| [[info:libc:Basic Signal Handling]] |
2660
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2662
perror_plus("sigaction");
2665
if(old_sigterm_action.sa_handler != SIG_IGN){
2666
ret = sigaction(SIGINT, &sigterm_action, NULL);
2668
perror_plus("sigaction");
2669
exitcode = EX_OSERR;
2673
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2675
perror_plus("sigaction");
2678
if(old_sigterm_action.sa_handler != SIG_IGN){
2679
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2681
perror_plus("sigaction");
2682
exitcode = EX_OSERR;
2686
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2688
perror_plus("sigaction");
2691
if(old_sigterm_action.sa_handler != SIG_IGN){
2692
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2694
perror_plus("sigaction");
2695
exitcode = EX_OSERR;
2700
/* If no interfaces were specified, make a list */
2701
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2703
/* Look for any good interfaces */
2704
ret = scandir(sys_class_net, &direntries, good_interface,
2707
/* Add all found interfaces to interfaces list */
2708
for(int i = 0; i < ret; ++i){
2709
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2710
direntries[i]->d_name);
2713
perror_plus("argz_add");
2714
free(direntries[i]);
2718
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
direntries[i]->d_name);
2721
free(direntries[i]);
2728
fprintf_plus(stderr, "Could not find a network interface\n");
2729
exitcode = EXIT_FAILURE;
2734
/* Bring up interfaces which are down, and remove any "none"s */
2736
char *interface = NULL;
2737
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2739
/* If interface name is "none", stop bringing up interfaces.
2740
Also remove all instances of "none" from the list */
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2745
while((interface = argz_next(mc.interfaces,
2746
mc.interfaces_size, interface))){
2747
if(strcmp(interface, "none") == 0){
2748
argz_delete(&mc.interfaces, &mc.interfaces_size,
2755
bool interface_was_up = interface_is_up(interface);
2756
errno = bring_up_interface(interface, delay);
2757
if(not interface_was_up){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2766
perror_plus("argz_add");
2771
if(debug and (interfaces_to_take_down == NULL)){
2772
fprintf_plus(stderr, "No interfaces were brought up\n");
2776
/* If we only got one interface, explicitly use only that one */
2777
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
822
AvahiSServiceBrowser *sb = NULL;
827
int exitcode = EXIT_SUCCESS;
828
const char *interface = "eth0";
829
struct ifreq network;
833
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
bool tempdir_created = false;
836
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
837
const char *seckey = PATHDIR "/" SECKEY;
838
const char *pubkey = PATHDIR "/" PUBKEY;
840
mandos_context mc = { .simple_poll = NULL, .server = NULL,
841
.dh_bits = 1024, .priority = "SECURE256"
842
":!CTYPE-X.509:+CTYPE-OPENPGP" };
843
bool gnutls_initialized = false;
844
bool gpgme_initialized = false;
847
struct argp_option options[] = {
848
{ .name = "debug", .key = 128,
849
.doc = "Debug mode", .group = 3 },
850
{ .name = "connect", .key = 'c',
851
.arg = "ADDRESS:PORT",
852
.doc = "Connect directly to a specific Mandos server",
854
{ .name = "interface", .key = 'i',
856
.doc = "Interface that will be used to search for Mandos"
859
{ .name = "seckey", .key = 's',
861
.doc = "OpenPGP secret key file base name",
863
{ .name = "pubkey", .key = 'p',
865
.doc = "OpenPGP public key file base name",
867
{ .name = "dh-bits", .key = 129,
869
.doc = "Bit length of the prime number used in the"
870
" Diffie-Hellman key exchange",
872
{ .name = "priority", .key = 130,
874
.doc = "GnuTLS priority string for the TLS handshake",
879
error_t parse_opt(int key, char *arg,
880
struct argp_state *state) {
882
case 128: /* --debug */
885
case 'c': /* --connect */
888
case 'i': /* --interface */
891
case 's': /* --seckey */
894
case 'p': /* --pubkey */
897
case 129: /* --dh-bits */
898
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
899
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
900
or arg[numchars] != '\0'){
901
fprintf(stderr, "Bad number of DH bits\n");
904
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
906
case 130: /* --priority */
914
return ARGP_ERR_UNKNOWN;
919
struct argp argp = { .options = options, .parser = parse_opt,
921
.doc = "Mandos client -- Get and decrypt"
922
" passwords from a Mandos server" };
923
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
924
if(ret == ARGP_ERR_UNKNOWN){
925
fprintf(stderr, "Unknown error while parsing arguments\n");
926
exitcode = EXIT_FAILURE;
931
/* If the interface is down, bring it up */
933
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
936
exitcode = EXIT_FAILURE;
939
strcpy(network.ifr_name, interface);
940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
942
perror("ioctl SIOCGIFFLAGS");
943
exitcode = EXIT_FAILURE;
946
if((network.ifr_flags & IFF_UP) == 0){
947
network.ifr_flags |= IFF_UP;
948
ret = ioctl(sd, SIOCSIFFLAGS, &network);
950
perror("ioctl SIOCSIFFLAGS");
951
exitcode = EXIT_FAILURE;
955
ret = (int)TEMP_FAILURE_RETRY(close(sd));
974
ret = init_gnutls_global(&mc, pubkey, seckey);
976
fprintf(stderr, "init_gnutls_global failed\n");
977
exitcode = EXIT_FAILURE;
980
gnutls_initialized = true;
983
if(mkdtemp(tempdir) == NULL){
987
tempdir_created = true;
989
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
990
fprintf(stderr, "init_gpgme failed\n");
991
exitcode = EXIT_FAILURE;
994
gpgme_initialized = true;
997
if_index = (AvahiIfIndex) if_nametoindex(interface);
999
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1000
exitcode = EXIT_FAILURE;
1004
if(connect_to != NULL){
1005
/* Connect directly, do not use Zeroconf */
1006
/* (Mainly meant for debugging) */
1007
char *address = strrchr(connect_to, ':');
1008
if(address == NULL){
1009
fprintf(stderr, "No colon in address\n");
1010
exitcode = EXIT_FAILURE;
1014
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1015
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1016
or address[numchars+1] != '\0'){
1017
fprintf(stderr, "Bad port number\n");
1018
exitcode = EXIT_FAILURE;
1021
port = (uint16_t)tmpmax;
1023
address = connect_to;
1024
ret = start_mandos_communication(address, port, if_index, &mc);
1026
exitcode = EXIT_FAILURE;
1028
exitcode = EXIT_SUCCESS;
1034
avahi_set_log_function(empty_log);
1037
/* Initialize the pseudo-RNG for Avahi */
1038
srand((unsigned int) time(NULL));
1040
/* Allocate main Avahi loop object */
1041
mc.simple_poll = avahi_simple_poll_new();
1042
if(mc.simple_poll == NULL) {
1043
fprintf(stderr, "Avahi: Failed to create simple poll"
1045
exitcode = EXIT_FAILURE;
1050
AvahiServerConfig config;
1051
/* Do not publish any local Zeroconf records */
1052
avahi_server_config_init(&config);
1053
config.publish_hinfo = 0;
1054
config.publish_addresses = 0;
1055
config.publish_workstation = 0;
1056
config.publish_domain = 0;
1058
/* Allocate a new server */
1059
mc.server = avahi_server_new(avahi_simple_poll_get
1060
(mc.simple_poll), &config, NULL,
1063
/* Free the Avahi configuration data */
1064
avahi_server_config_free(&config);
1067
/* Check if creating the Avahi server object succeeded */
1068
if(mc.server == NULL) {
1069
fprintf(stderr, "Failed to create Avahi server: %s\n",
1070
avahi_strerror(error));
1071
exitcode = EXIT_FAILURE;
1075
/* Create the Avahi service browser */
1076
sb = avahi_s_service_browser_new(mc.server, if_index,
1078
"_mandos._tcp", NULL, 0,
1079
browse_callback, &mc);
1081
fprintf(stderr, "Failed to create service browser: %s\n",
1082
avahi_strerror(avahi_server_errno(mc.server)));
1083
exitcode = EXIT_FAILURE;
1087
/* Run the main loop */
2779
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2782
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2791
fprintf_plus(stderr, "init_gnutls_global failed\n");
2792
exitcode = EX_UNAVAILABLE;
2795
gnutls_initialized = true;
2802
/* Try /run/tmp before /tmp */
2803
tempdir = mkdtemp(run_tempdir);
2804
if(tempdir == NULL and errno == ENOENT){
2806
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2807
run_tempdir, old_tempdir);
2809
tempdir = mkdtemp(old_tempdir);
2811
if(tempdir == NULL){
2812
perror_plus("mkdtemp");
2820
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2821
fprintf_plus(stderr, "init_gpgme failed\n");
2822
exitcode = EX_UNAVAILABLE;
2825
gpgme_initialized = true;
2832
if(connect_to != NULL){
2833
/* Connect directly, do not use Zeroconf */
2834
/* (Mainly meant for debugging) */
2835
char *address = strrchr(connect_to, ':');
2837
if(address == NULL){
2838
fprintf_plus(stderr, "No colon in address\n");
2839
exitcode = EX_USAGE;
2849
tmpmax = strtoimax(address+1, &tmp, 10);
2850
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2851
or tmpmax != (in_port_t)tmpmax){
2852
fprintf_plus(stderr, "Bad port number\n");
2853
exitcode = EX_USAGE;
2861
port = (in_port_t)tmpmax;
2863
/* Colon in address indicates IPv6 */
2865
if(strchr(connect_to, ':') != NULL){
2867
/* Accept [] around IPv6 address - see RFC 5952 */
2868
if(connect_to[0] == '[' and address[-1] == ']')
2876
address = connect_to;
2882
while(not quit_now){
2883
ret = start_mandos_communication(address, port, if_index, af,
2885
if(quit_now or ret == 0){
2889
fprintf_plus(stderr, "Retrying in %d seconds\n",
2890
(int)retry_interval);
2892
sleep((unsigned int)retry_interval);
2896
exitcode = EXIT_SUCCESS;
2907
AvahiServerConfig config;
2908
/* Do not publish any local Zeroconf records */
2909
avahi_server_config_init(&config);
2910
config.publish_hinfo = 0;
2911
config.publish_addresses = 0;
2912
config.publish_workstation = 0;
2913
config.publish_domain = 0;
2915
/* Allocate a new server */
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2919
/* Free the Avahi configuration data */
2920
avahi_server_config_free(&config);
2923
/* Check if creating the Avahi server object succeeded */
2924
if(mc.server == NULL){
2925
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2927
exitcode = EX_UNAVAILABLE;
2935
/* Create the Avahi service browser */
2936
sb = avahi_s_service_browser_new(mc.server, if_index,
2937
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2938
NULL, 0, browse_callback,
2941
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2942
avahi_strerror(avahi_server_errno(mc.server)));
2943
exitcode = EX_UNAVAILABLE;
2951
/* Run the main loop */
2954
fprintf_plus(stderr, "Starting Avahi loop search\n");
2957
ret = avahi_loop_with_timeout(simple_poll,
2958
(int)(retry_interval * 1000), &mc);
2960
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2961
(ret == 0) ? "successfully" : "with error");
1090
fprintf(stderr, "Starting Avahi loop search\n");
1093
avahi_simple_poll_loop(mc.simple_poll);
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2976
/* Cleanup things */
2977
free(mc.interfaces);
2980
avahi_s_service_browser_free(sb);
2982
if(mc.server != NULL)
2983
avahi_server_free(mc.server);
2985
if(simple_poll != NULL)
2986
avahi_simple_poll_free(simple_poll);
2988
if(gnutls_initialized){
2989
gnutls_certificate_free_credentials(mc.cred);
2990
gnutls_dh_params_deinit(mc.dh_params);
2993
if(gpgme_initialized){
2994
gpgme_release(mc.ctx);
2997
/* Cleans up the circular linked list of Mandos servers the client
2999
if(mc.current_server != NULL){
3000
mc.current_server->prev->next = NULL;
3001
while(mc.current_server != NULL){
3002
server *next = mc.current_server->next;
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3007
free((char *)(mc.current_server->ip));
3009
#pragma GCC diagnostic pop
3011
free(mc.current_server);
3012
mc.current_server = next;
3016
/* Re-raise privileges */
3018
ret = raise_privileges();
3021
perror_plus("Failed to raise privileges");
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3028
/* Take down the network interfaces which were brought up */
3030
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3034
ret = take_down_interface(interface);
3037
perror_plus("Failed to take down interface");
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3047
ret = lower_privileges_permanently();
3050
perror_plus("Failed to lower privileges permanently");
3054
free(interfaces_to_take_down);
3055
free(interfaces_hooks);
3057
void clean_dir_at(int base, const char * const dirname,
3059
struct dirent **direntries = NULL;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3067
perror_plus("open");
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3096
free(direntries[i]);
3099
/* need to clean even if 0 because man page doesn't specify */
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3106
perror_plus("scandirat");
3111
/* Removes the GPGME temp directory and all files inside */
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
3117
sigemptyset(&old_sigterm_action.sa_mask);
3118
old_sigterm_action.sa_handler = SIG_DFL;
3119
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3120
&old_sigterm_action,
3123
perror_plus("sigaction");
3126
ret = raise(signal_received);
3127
} while(ret != 0 and errno == EINTR);
3129
perror_plus("raise");
3132
TEMP_FAILURE_RETRY(pause());
1098
fprintf(stderr, "%s exiting\n", argv[0]);
1101
/* Cleanup things */
1103
avahi_s_service_browser_free(sb);
1105
if(mc.server != NULL)
1106
avahi_server_free(mc.server);
1108
if(mc.simple_poll != NULL)
1109
avahi_simple_poll_free(mc.simple_poll);
1111
if(gnutls_initialized){
1112
gnutls_certificate_free_credentials(mc.cred);
1113
gnutls_global_deinit();
1114
gnutls_dh_params_deinit(mc.dh_params);
1117
if(gpgme_initialized){
1118
gpgme_release(mc.ctx);
1121
/* Removes the temp directory used by GPGME */
1122
if(tempdir_created){
1124
struct dirent *direntry;
1125
d = opendir(tempdir);
1127
if(errno != ENOENT){
1132
direntry = readdir(d);
1133
if(direntry == NULL){
1136
/* Skip "." and ".." */
1137
if(direntry->d_name[0] == '.'
1138
and (direntry->d_name[1] == '\0'
1139
or (direntry->d_name[1] == '.'
1140
and direntry->d_name[2] == '\0'))){
1143
char *fullname = NULL;
1144
ret = asprintf(&fullname, "%s/%s", tempdir,
1150
ret = remove(fullname);
1152
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1159
ret = rmdir(tempdir);
1160
if(ret == -1 and errno != ENOENT){