650
612
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
651
613
__attribute__((unused)) const char *txt){}
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
709
AvahiIfIndex if_index){
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char remove_arg[] = "remove";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
747
perror_plus("setgid");
750
/* Reset supplementary groups */
752
ret = setgroups(0, NULL);
754
perror_plus("setgroups");
758
ret = dup2(devnull, STDIN_FILENO);
760
perror_plus("dup2(devnull, STDIN_FILENO)");
763
ret = close(devnull);
765
perror_plus("close");
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
778
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
780
TEMP_FAILURE_RETRY(close(helperdir_fd));
782
#pragma GCC diagnostic push
783
#pragma GCC diagnostic ignored "-Wcast-qual"
785
if(fexecve(helper_fd, (char *const [])
786
{ helper, add ? add_arg : remove_arg, (char *)address,
787
interface, NULL }, environ) == -1){
789
#pragma GCC diagnostic pop
791
perror_plus("fexecve");
803
pret = waitpid(pid, &status, 0);
804
if(pret == -1 and errno == EINTR and quit_now){
805
int errno_raising = 0;
806
if((errno = raise_privileges()) != 0){
807
errno_raising = errno;
808
perror_plus("Failed to raise privileges in order to"
809
" kill helper program");
811
if(kill(pid, SIGTERM) == -1){
814
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
815
perror_plus("Failed to lower privileges after killing"
820
} while(pret == -1 and errno == EINTR);
822
perror_plus("waitpid");
825
if(WIFEXITED(status)){
826
if(WEXITSTATUS(status) != 0){
827
fprintf_plus(stderr, "Error: iprouteadddel exited"
828
" with status %d\n", WEXITSTATUS(status));
833
if(WIFSIGNALED(status)){
834
fprintf_plus(stderr, "Error: iprouteadddel died by"
835
" signal %d\n", WTERMSIG(status));
838
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
842
__attribute__((nonnull, warn_unused_result))
843
static bool add_local_route(const char *address,
844
AvahiIfIndex if_index){
845
return add_remove_local_route(true, address, if_index);
848
__attribute__((nonnull, warn_unused_result))
849
static bool remove_local_route(const char *address,
850
AvahiIfIndex if_index){
851
return add_remove_local_route(false, address, if_index);
854
615
/* Called when a Mandos server is found */
855
__attribute__((nonnull, warn_unused_result))
856
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
857
617
AvahiIfIndex if_index,
858
int af, mandos_context *mc){
859
619
int ret, tcp_sd = -1;
861
struct sockaddr_storage to;
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
862
625
char *buffer = NULL;
863
626
char *decrypted_buffer = NULL;
864
627
size_t buffer_length = 0;
992
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
993
729
perror_plus("if_indextoname");
995
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
996
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
999
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1000
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
1002
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1003
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1005
ret = getnameinfo((struct sockaddr *)&to,
1006
sizeof(struct sockaddr_in6),
1007
addrstr, sizeof(addrstr), NULL, 0,
1010
ret = getnameinfo((struct sockaddr *)&to,
1011
sizeof(struct sockaddr_in),
1012
addrstr, sizeof(addrstr), NULL, 0,
1015
if(ret == EAI_SYSTEM){
1016
perror_plus("getnameinfo");
1017
} else if(ret != 0) {
1018
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1019
} else if(strcmp(addrstr, ip) != 0){
1020
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1031
ret = connect(tcp_sd, (struct sockaddr *)&to,
1032
sizeof(struct sockaddr_in6));
1034
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1035
sizeof(struct sockaddr_in));
1038
if(errno == ENETUNREACH
1039
and if_index != AVAHI_IF_UNSPEC
1040
and connect_to == NULL
1041
and not route_added and
1042
((af == AF_INET6 and not
1043
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1045
or (af == AF_INET and
1046
/* Not a a IPv4LL address */
1047
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1048
& 0xFFFF0000L) != 0xA9FE0000L))){
1049
/* Work around Avahi bug - Avahi does not announce link-local
1050
addresses if it has a global address, so local hosts with
1051
*only* a link-local address (e.g. Mandos clients) cannot
1052
connect to a Mandos server announced by Avahi on a server
1053
host with a global address. Work around this by retrying
1054
with an explicit route added with the server's address.
1056
Avahi bug reference:
1057
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1058
https://bugs.debian.org/587961
1061
route_added = add_local_route(ip, if_index);
1067
if(errno != ECONNREFUSED or debug){
1069
perror_plus("connect");
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
perror_plus("inet_ntop");
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
perror_plus("connect");
1082
781
const char *out = mandos_protocol_version;
1695
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1698
if(ret > 0 or errno != EINTR){
1372
if (ret > 0 or errno != EINTR){
1699
1373
return (ret != 1) ? ret : 0;
1705
__attribute__((nonnull))
1706
void run_network_hooks(const char *mode, const char *interface,
1379
bool run_network_hooks(const char *mode, const char *interface,
1707
1380
const float delay){
1708
struct dirent **direntries = NULL;
1709
if(hookdir_fd == -1){
1710
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1712
if(hookdir_fd == -1){
1713
if(errno == ENOENT){
1715
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1716
" found\n", hookdir);
1719
perror_plus("open");
1725
#if __GLIBC_PREREQ(2, 15)
1726
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1727
runnable_hook, alphasort);
1728
#else /* not __GLIBC_PREREQ(2, 15) */
1729
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1731
#endif /* not __GLIBC_PREREQ(2, 15) */
1732
#else /* not __GLIBC__ */
1733
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1735
#endif /* not __GLIBC__ */
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1736
1386
if(numhooks == -1){
1737
1387
perror_plus("scandir");
1740
struct dirent *direntry;
1742
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1744
perror_plus("open(\"/dev/null\", O_RDONLY)");
1747
for(int i = 0; i < numhooks; i++){
1748
direntry = direntries[i];
1750
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1753
pid_t hook_pid = fork();
1756
/* Raise privileges */
1757
errno = raise_privileges_permanently();
1759
perror_plus("Failed to raise privileges");
1766
perror_plus("setgid");
1769
/* Reset supplementary groups */
1771
ret = setgroups(0, NULL);
1773
perror_plus("setgroups");
1776
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1778
perror_plus("setenv");
1781
ret = setenv("DEVICE", interface, 1);
1783
perror_plus("setenv");
1786
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1788
perror_plus("setenv");
1791
ret = setenv("MODE", mode, 1);
1793
perror_plus("setenv");
1797
ret = asprintf(&delaystring, "%f", (double)delay);
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1799
1395
perror_plus("asprintf");
1802
ret = setenv("DELAY", delaystring, 1);
1398
pid_t hook_pid = fork();
1401
dup2(devnull, STDIN_FILENO);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1406
perror_plus("setenv");
1409
ret = setenv("DEVICE", interface, 1);
1411
perror_plus("setenv");
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1416
perror_plus("setenv");
1419
ret = setenv("MODE", mode, 1);
1421
perror_plus("setenv");
1425
ret = asprintf(&delaystring, "%f", delay);
1427
perror_plus("asprintf");
1430
ret = setenv("DELAY", delaystring, 1);
1433
perror_plus("setenv");
1804
1436
free(delaystring);
1805
perror_plus("setenv");
1809
if(connect_to != NULL){
1810
ret = setenv("CONNECT", connect_to, 1);
1812
perror_plus("setenv");
1816
int hook_fd = TEMP_FAILURE_RETRY(openat(hookdir_fd,
1820
perror_plus("openat");
1821
_exit(EXIT_FAILURE);
1823
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1824
perror_plus("close");
1825
_exit(EXIT_FAILURE);
1827
ret = dup2(devnull, STDIN_FILENO);
1829
perror_plus("dup2(devnull, STDIN_FILENO)");
1832
ret = close(devnull);
1834
perror_plus("close");
1837
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1839
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1842
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1844
perror_plus("fexecve");
1845
_exit(EXIT_FAILURE);
1849
perror_plus("fork");
1854
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1855
perror_plus("waitpid");
1859
if(WIFEXITED(status)){
1860
if(WEXITSTATUS(status) != 0){
1861
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1862
" with status %d\n", direntry->d_name,
1863
WEXITSTATUS(status));
1867
} else if(WIFSIGNALED(status)){
1868
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1869
" signal %d\n", direntry->d_name,
1874
fprintf_plus(stderr, "Warning: network hook \"%s\""
1875
" crashed\n", direntry->d_name);
1881
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1887
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1888
perror_plus("close");
1895
__attribute__((nonnull, warn_unused_result))
1896
error_t bring_up_interface(const char *const interface,
1898
error_t old_errno = errno;
1900
struct ifreq network;
1901
unsigned int if_index = if_nametoindex(interface);
1903
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1913
if(not interface_is_up(interface)){
1914
error_t ret_errno = 0, ioctl_errno = 0;
1915
if(not get_flags(interface, &network)){
1917
fprintf_plus(stderr, "Failed to get flags for interface "
1918
"\"%s\"\n", interface);
1922
network.ifr_flags |= IFF_UP; /* set flag */
1924
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1927
perror_plus("socket");
1933
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1935
perror_plus("close");
1942
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1946
/* Raise privileges */
1947
ret_errno = raise_privileges();
1950
perror_plus("Failed to raise privileges");
1955
bool restore_loglevel = false;
1957
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1958
messages about the network interface to mess up the prompt */
1959
ret_linux = klogctl(8, NULL, 5);
1960
if(ret_linux == -1){
1961
perror_plus("klogctl");
1963
restore_loglevel = true;
1966
#endif /* __linux__ */
1967
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1968
ioctl_errno = errno;
1970
if(restore_loglevel){
1971
ret_linux = klogctl(7, NULL, 0);
1972
if(ret_linux == -1){
1973
perror_plus("klogctl");
1976
#endif /* __linux__ */
1978
/* If raise_privileges() succeeded above */
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1984
perror_plus("Failed to lower privileges");
1988
/* Close the socket */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
perror_plus("close");
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2001
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2005
/* Sleep checking until interface is running.
2006
Check every 0.25s, up to total time of delay */
2007
for(int i=0; i < delay * 4; i++){
2008
if(interface_is_running(interface)){
2011
struct timespec sleeptime = { .tv_nsec = 250000000 };
2012
ret = nanosleep(&sleeptime, NULL);
2013
if(ret == -1 and errno != EINTR){
2014
perror_plus("nanosleep");
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t take_down_interface(const char *const interface){
2024
error_t old_errno = errno;
2025
struct ifreq network;
2026
unsigned int if_index = if_nametoindex(interface);
2028
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2032
if(interface_is_up(interface)){
2033
error_t ret_errno = 0, ioctl_errno = 0;
2034
if(not get_flags(interface, &network) and debug){
2036
fprintf_plus(stderr, "Failed to get flags for interface "
2037
"\"%s\"\n", interface);
2041
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2043
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2046
perror_plus("socket");
2052
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2056
/* Raise privileges */
2057
ret_errno = raise_privileges();
2060
perror_plus("Failed to raise privileges");
2063
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2064
ioctl_errno = errno;
2066
/* If raise_privileges() succeeded above */
2068
/* Lower privileges */
2069
ret_errno = lower_privileges();
2072
perror_plus("Failed to lower privileges");
2076
/* Close the socket */
2077
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2079
perror_plus("close");
2082
if(ret_setflags == -1){
2083
errno = ioctl_errno;
2084
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2089
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
2097
1477
int main(int argc, char *argv[]){
2098
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2099
.priority = "SECURE256:!CTYPE-X.509:"
2100
"+CTYPE-OPENPGP", .current_server = NULL,
2101
.interfaces = NULL, .interfaces_size = 0 };
2102
1478
AvahiSServiceBrowser *sb = NULL;
2105
1481
intmax_t tmpmax;
2107
1483
int exitcode = EXIT_SUCCESS;
2108
char *interfaces_to_take_down = NULL;
2109
size_t interfaces_to_take_down_size = 0;
2110
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2111
char old_tempdir[] = "/tmp/mandosXXXXXX";
2112
char *tempdir = NULL;
1484
const char *interface = "";
1485
struct ifreq network;
1487
bool take_down_interface = false;
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1491
bool tempdir_created = false;
2113
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2114
1493
const char *seckey = PATHDIR "/" SECKEY;
2115
1494
const char *pubkey = PATHDIR "/" PUBKEY;
2116
char *interfaces_hooks = NULL;
2118
1496
bool gnutls_initialized = false;
2119
1497
bool gpgme_initialized = false;
2297
1673
/* Work around Debian bug #633582:
2298
1674
<http://bugs.debian.org/633582> */
2300
/* Re-raise privileges */
2301
ret_errno = raise_privileges();
2304
perror_plus("Failed to raise privileges");
2308
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2309
int seckey_fd = open(seckey, O_RDONLY);
2310
if(seckey_fd == -1){
2311
perror_plus("open");
2313
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2315
perror_plus("fstat");
2317
if(S_ISREG(st.st_mode)
2318
and st.st_uid == 0 and st.st_gid == 0){
2319
ret = fchown(seckey_fd, uid, gid);
2321
perror_plus("fchown");
2325
TEMP_FAILURE_RETRY(close(seckey_fd));
2329
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2330
int pubkey_fd = open(pubkey, O_RDONLY);
2331
if(pubkey_fd == -1){
2332
perror_plus("open");
2334
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2336
perror_plus("fstat");
2338
if(S_ISREG(st.st_mode)
2339
and st.st_uid == 0 and st.st_gid == 0){
2340
ret = fchown(pubkey_fd, uid, gid);
2342
perror_plus("fchown");
2346
TEMP_FAILURE_RETRY(close(pubkey_fd));
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2354
perror_plus("Failed to lower privileges");
2359
/* Remove invalid interface names (except "none") */
2361
char *interface = NULL;
2362
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2364
if(strcmp(interface, "none") != 0
2365
and if_nametoindex(interface) == 0){
2366
if(interface[0] != '\0'){
2367
fprintf_plus(stderr, "Not using nonexisting interface"
2368
" \"%s\"\n", interface);
2370
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
1677
/* Re-raise priviliges */
1681
perror_plus("seteuid");
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1691
perror_plus("fstat");
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1697
perror_plus("fchown");
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1712
perror_plus("fstat");
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1718
perror_plus("fchown");
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1726
/* Lower privileges */
1730
perror_plus("seteuid");
2376
1734
/* Run network hooks */
2378
if(mc.interfaces != NULL){
2379
interfaces_hooks = malloc(mc.interfaces_size);
2380
if(interfaces_hooks == NULL){
2381
perror_plus("malloc");
2384
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2385
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2387
run_network_hooks("start", interfaces_hooks != NULL ?
2388
interfaces_hooks : "", delay);
1736
/* Re-raise priviliges */
1740
perror_plus("seteuid");
1742
if(not run_network_hooks("start", interface, delay)){
1745
/* Lower privileges */
1749
perror_plus("seteuid");
2392
1754
avahi_set_log_function(empty_log);
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1763
/* No up interfaces, look for any good interfaces */
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1774
if(interface == NULL){
1775
perror_plus("malloc");
1777
exitcode = EXIT_FAILURE;
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
2395
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2396
1790
from the signal handler */
2397
1791
/* Initialize the pseudo-RNG for Avahi */
2398
1792
srand((unsigned int) time(NULL));
2399
simple_poll = avahi_simple_poll_new();
2400
if(simple_poll == NULL){
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2401
1795
fprintf_plus(stderr,
2402
1796
"Avahi: Failed to create simple poll object.\n");
2403
1797
exitcode = EX_UNAVAILABLE;
2470
/* If no interfaces were specified, make a list */
2471
if(mc.interfaces == NULL){
2472
struct dirent **direntries = NULL;
2473
/* Look for any good interfaces */
2474
ret = scandir(sys_class_net, &direntries, good_interface,
2477
/* Add all found interfaces to interfaces list */
2478
for(int i = 0; i < ret; ++i){
2479
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2480
direntries[i]->d_name);
2483
perror_plus("argz_add");
2484
free(direntries[i]);
2488
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2489
direntries[i]->d_name);
2491
free(direntries[i]);
2498
fprintf_plus(stderr, "Could not find a network interface\n");
2499
exitcode = EXIT_FAILURE;
2504
/* Bring up interfaces which are down, and remove any "none"s */
2506
char *interface = NULL;
2507
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2509
/* If interface name is "none", stop bringing up interfaces.
2510
Also remove all instances of "none" from the list */
2511
if(strcmp(interface, "none") == 0){
2512
argz_delete(&mc.interfaces, &mc.interfaces_size,
2515
while((interface = argz_next(mc.interfaces,
2516
mc.interfaces_size, interface))){
2517
if(strcmp(interface, "none") == 0){
2518
argz_delete(&mc.interfaces, &mc.interfaces_size,
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1877
/* Re-raise priviliges */
1881
perror_plus("seteuid");
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1893
#endif /* __linux__ */
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1903
perror_plus("klogctl");
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1911
perror_plus("seteuid");
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
perror_plus("ioctl SIOCGIFFLAGS");
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1923
perror_plus("klogctl");
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1932
perror_plus("seteuid");
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1948
perror_plus("klogctl");
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1956
perror_plus("seteuid");
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
2525
bool interface_was_up = interface_is_up(interface);
2526
errno = bring_up_interface(interface, delay);
2527
if(not interface_was_up){
2529
perror_plus("Failed to bring up interface");
2531
errno = argz_add(&interfaces_to_take_down,
2532
&interfaces_to_take_down_size,
2535
perror_plus("argz_add");
2540
if(debug and (interfaces_to_take_down == NULL)){
2541
fprintf_plus(stderr, "No interfaces were brought up\n");
2545
/* If we only got one interface, explicitly use only that one */
2546
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2548
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2551
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1980
perror_plus("close");
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1988
perror_plus("klogctl");
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1994
/* Lower privileges */
1997
perror_plus("seteuid");
2558
ret = init_gnutls_global(pubkey, seckey, &mc);
2005
ret = init_gnutls_global(pubkey, seckey);
2560
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2561
2008
exitcode = EX_UNAVAILABLE;
2757
2192
if(gpgme_initialized){
2758
2193
gpgme_release(mc.ctx);
2761
2196
/* Cleans up the circular linked list of Mandos servers the client
2763
2198
if(mc.current_server != NULL){
2764
2199
mc.current_server->prev->next = NULL;
2765
2200
while(mc.current_server != NULL){
2766
2201
server *next = mc.current_server->next;
2768
#pragma GCC diagnostic push
2769
#pragma GCC diagnostic ignored "-Wcast-qual"
2771
free((char *)(mc.current_server->ip));
2773
#pragma GCC diagnostic pop
2775
2202
free(mc.current_server);
2776
2203
mc.current_server = next;
2780
/* Re-raise privileges */
2207
/* Re-raise priviliges */
2782
ret_errno = raise_privileges();
2785
perror_plus("Failed to raise privileges");
2788
/* Run network hooks */
2789
run_network_hooks("stop", interfaces_hooks != NULL ?
2790
interfaces_hooks : "", delay);
2792
/* Take down the network interfaces which were brought up */
2794
char *interface = NULL;
2795
while((interface=argz_next(interfaces_to_take_down,
2796
interfaces_to_take_down_size,
2798
ret_errno = take_down_interface(interface);
2801
perror_plus("Failed to take down interface");
2804
if(debug and (interfaces_to_take_down == NULL)){
2805
fprintf_plus(stderr, "No interfaces needed to be taken"
2212
perror_plus("seteuid");
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2811
ret_errno = lower_privileges_permanently();
2814
perror_plus("Failed to lower privileges permanently");
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2233
perror_plus("close");
2818
free(interfaces_to_take_down);
2819
free(interfaces_hooks);
2237
/* Lower privileges permanently */
2241
perror_plus("setuid");
2821
2244
/* Removes the GPGME temp directory and all files inside */
2822
if(tempdir != NULL){
2245
if(tempdir_created){
2823
2246
struct dirent **direntries = NULL;
2824
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2828
if(tempdir_fd == -1){
2829
perror_plus("open");
2832
#if __GLIBC_PREREQ(2, 15)
2833
int numentries = scandirat(tempdir_fd, ".", &direntries,
2834
notdotentries, alphasort);
2835
#else /* not __GLIBC_PREREQ(2, 15) */
2836
int numentries = scandir(tempdir, &direntries, notdotentries,
2838
#endif /* not __GLIBC_PREREQ(2, 15) */
2839
#else /* not __GLIBC__ */
2840
int numentries = scandir(tempdir, &direntries, notdotentries,
2842
#endif /* not __GLIBC__ */
2843
if(numentries >= 0){
2844
for(int i = 0; i < numentries; i++){
2845
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2847
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2848
" \"%s\", 0): %s\n", tempdir,
2849
direntries[i]->d_name, strerror(errno));
2851
free(direntries[i]);
2854
/* need to clean even if 0 because man page doesn't specify */
2856
if(numentries == -1){
2857
perror_plus("scandir");
2859
ret = rmdir(tempdir);
2860
if(ret == -1 and errno != ENOENT){
2861
perror_plus("rmdir");
2247
struct dirent *direntry = NULL;
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2250
if (numentries > 0){
2251
for(int i = 0; i < numentries; i++){
2252
direntry = direntries[i];
2253
char *fullname = NULL;
2254
ret = asprintf(&fullname, "%s/%s", tempdir,
2257
perror_plus("asprintf");
2260
ret = remove(fullname);
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2864
TEMP_FAILURE_RETRY(close(tempdir_fd));
2269
/* need to clean even if 0 because man page doesn't specify */
2271
if (numentries == -1){
2272
perror_plus("scandir");
2274
ret = rmdir(tempdir);
2275
if(ret == -1 and errno != ENOENT){
2276
perror_plus("rmdir");