569
529
/* GnuTLS server initialization */
570
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
571
531
if(ret != GNUTLS_E_SUCCESS){
572
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
533
" initialization: %s\n",
574
534
safer_gnutls_strerror(ret));
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
dhparamsfilename = NULL;
587
size_t params_capacity = 0;
589
params_capacity = incbuffer((char **)¶ms.data,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
596
dhparamsfilename = NULL;
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
606
/* check bytes_read for failure */
611
dhparamsfilename = NULL;
614
params.size += (unsigned int)bytes_read;
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
620
if(dhparamsfilename == NULL){
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
640
int secfile = open(seckeyfilename, O_RDONLY);
645
size_t buffer_capacity = 0;
647
buffer_capacity = incbuffer((char **)&buffer.data,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
663
/* check bytes_read for failure */
670
buffer.size += (unsigned int)bytes_read;
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
683
safer_gnutls_strerror(ret));
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
697
/* Use private key to suggest an appropriate
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
714
fprintf_plus(stderr, "Falling back to security parameter"
716
safe_string(gnutls_sec_param_get_name
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
736
safer_gnutls_strerror(ret));
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_dh_params_deinit(mc->dh_params);
550
gnutls_certificate_free_credentials(mc.cred);
551
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
762
__attribute__((nonnull, warn_unused_result))
763
static int init_gnutls_session(gnutls_session_t *session,
556
static int init_gnutls_session(gnutls_session_t *session){
766
558
/* GnuTLS session creation */
819
613
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
614
__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
616
/* 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,
617
static int start_mandos_communication(const char *ip, uint16_t port,
1043
618
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
1045
620
int ret, tcp_sd = -1;
1047
struct sockaddr_storage to;
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
1048
626
char *buffer = NULL;
1049
627
char *decrypted_buffer = NULL;
1050
628
size_t buffer_length = 0;
1180
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
730
perror_plus("if_indextoname");
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
1190
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
740
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");
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
perror_plus("inet_ntop");
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
perror_plus("connect");
1274
782
const char *out = mandos_protocol_version;
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))
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1211
if(not get_flags(if_entry->d_name, &ifr)){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1237
if(not good_flags(if_entry->d_name, &ifr)){
1770
1243
int notdotentries(const struct dirent *direntry){
1771
1244
/* Skip "." and ".." */
1772
1245
if(direntry->d_name[0] == '.'
1900
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1903
if(ret > 0 or errno != EINTR){
1380
if (ret > 0 or errno != EINTR){
1904
1381
return (ret != 1) ? ret : 0;
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1387
bool run_network_hooks(const char *mode, const char *interface,
1912
1388
const float delay){
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);
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1936
1394
if(numhooks == -1){
1937
1395
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);
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1995
1403
perror_plus("asprintf");
1998
ret = setenv("DELAY", delaystring, 1);
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1410
pid_t hook_pid = fork();
1413
/* Raise privileges */
1417
perror_plus("seteuid");
1419
/* Raise privileges even more */
1423
perror_plus("setuid");
1429
perror_plus("setgid");
1431
/* Reset supplementary groups */
1433
ret = setgroups(0, NULL);
1435
perror_plus("setgroups");
1437
dup2(devnull, STDIN_FILENO);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
perror_plus("setenv");
1445
ret = setenv("DEVICE", interface, 1);
1447
perror_plus("setenv");
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
perror_plus("setenv");
1455
ret = setenv("MODE", mode, 1);
1457
perror_plus("setenv");
1461
ret = asprintf(&delaystring, "%f", delay);
1463
perror_plus("asprintf");
1466
ret = setenv("DELAY", delaystring, 1);
1469
perror_plus("setenv");
2000
1472
free(delaystring);
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",
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2295
1514
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
1515
AvahiSServiceBrowser *sb = NULL;
2304
1518
intmax_t tmpmax;
2306
1520
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;
1521
const char *interface = "";
1522
struct ifreq network;
1524
bool take_down_interface = false;
1527
char tempdir[] = "/tmp/mandosXXXXXX";
1528
bool tempdir_created = false;
2312
1529
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2313
1530
const char *seckey = PATHDIR "/" SECKEY;
2314
1531
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
char *interfaces_hooks = NULL;
2318
1533
bool gnutls_initialized = false;
2319
1534
bool gpgme_initialized = false;
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");
1757
TEMP_FAILURE_RETRY(close(pubkey_fd));
2580
1761
/* 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);
1765
perror_plus("seteuid");
2606
1770
/* 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);
1771
if(not run_network_hooks("start", interface, delay)){
2622
1776
avahi_set_log_function(empty_log);
1779
if(interface[0] == '\0'){
1780
struct dirent **direntries;
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1785
/* No up interfaces, look for any good interfaces */
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1791
/* Pick the first interface returned */
1792
interface = strdup(direntries[0]->d_name);
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
if(interface == NULL){
1797
perror_plus("malloc");
1799
exitcode = EXIT_FAILURE;
1805
fprintf_plus(stderr, "Could not find a network interface\n");
1806
exitcode = EXIT_FAILURE;
2625
1811
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2626
1812
from the signal handler */
2627
1813
/* Initialize the pseudo-RNG for Avahi */
2628
1814
srand((unsigned int) time(NULL));
2629
simple_poll = avahi_simple_poll_new();
2630
if(simple_poll == NULL){
1815
mc.simple_poll = avahi_simple_poll_new();
1816
if(mc.simple_poll == NULL){
2631
1817
fprintf_plus(stderr,
2632
1818
"Avahi: Failed to create simple poll object.\n");
2633
1819
exitcode = EX_UNAVAILABLE;
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,
1886
/* If the interface is down, bring it up */
1887
if(strcmp(interface, "none") != 0){
1888
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1891
exitcode = EX_UNAVAILABLE;
1899
/* Re-raise priviliges */
1903
perror_plus("seteuid");
1907
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1908
messages about the network interface to mess up the prompt */
1909
ret = klogctl(8, NULL, 5);
1910
bool restore_loglevel = true;
1912
restore_loglevel = false;
1913
perror_plus("klogctl");
1915
#endif /* __linux__ */
1917
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
perror_plus("socket");
1920
exitcode = EX_OSERR;
1922
if(restore_loglevel){
1923
ret = klogctl(7, NULL, 0);
1925
perror_plus("klogctl");
1928
#endif /* __linux__ */
1929
/* Lower privileges */
1933
perror_plus("seteuid");
1937
strcpy(network.ifr_name, interface);
1938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
perror_plus("ioctl SIOCGIFFLAGS");
1942
if(restore_loglevel){
1943
ret = klogctl(7, NULL, 0);
1945
perror_plus("klogctl");
1948
#endif /* __linux__ */
1949
exitcode = EX_OSERR;
1950
/* Lower privileges */
1954
perror_plus("seteuid");
1958
if((network.ifr_flags & IFF_UP) == 0){
1959
network.ifr_flags |= IFF_UP;
1960
take_down_interface = true;
1961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
take_down_interface = false;
1964
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1965
exitcode = EX_OSERR;
1967
if(restore_loglevel){
1968
ret = klogctl(7, NULL, 0);
1970
perror_plus("klogctl");
1973
#endif /* __linux__ */
1974
/* Lower privileges */
1978
perror_plus("seteuid");
1983
/* Sleep checking until interface is running.
1984
Check every 0.25s, up to total time of delay */
1985
for(int i=0; i < delay * 4; i++){
1986
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
perror_plus("ioctl SIOCGIFFLAGS");
1989
} else if(network.ifr_flags & IFF_RUNNING){
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){
2779
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2782
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1992
struct timespec sleeptime = { .tv_nsec = 250000000 };
1993
ret = nanosleep(&sleeptime, NULL);
1994
if(ret == -1 and errno != EINTR){
1995
perror_plus("nanosleep");
1998
if(not take_down_interface){
1999
/* We won't need the socket anymore */
2000
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
perror_plus("close");
2006
if(restore_loglevel){
2007
/* Restores kernel loglevel to default */
2008
ret = klogctl(7, NULL, 0);
2010
perror_plus("klogctl");
2013
#endif /* __linux__ */
2014
/* Lower privileges */
2016
/* Lower privileges */
2019
perror_plus("seteuid");
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2027
ret = init_gnutls_global(pubkey, seckey);
2791
2029
fprintf_plus(stderr, "init_gnutls_global failed\n");
2792
2030
exitcode = EX_UNAVAILABLE;
3000
2221
mc.current_server->prev->next = NULL;
3001
2222
while(mc.current_server != NULL){
3002
2223
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
2224
free(mc.current_server);
3012
2225
mc.current_server = next;
3016
/* Re-raise privileges */
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2232
/* Re-raise priviliges */
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"
2237
perror_plus("seteuid");
3047
ret = lower_privileges_permanently();
3050
perror_plus("Failed to lower privileges permanently");
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
perror_plus("ioctl SIOCGIFFLAGS");
2245
} else if(network.ifr_flags & IFF_UP){
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2252
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
perror_plus("close");
3054
free(interfaces_to_take_down);
3055
free(interfaces_hooks);
3057
void clean_dir_at(int base, const char * const dirname,
2258
/* Lower privileges permanently */
2262
perror_plus("setuid");
2265
/* Removes the GPGME temp directory and all files inside */
2266
if(tempdir_created){
3059
2267
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){
2268
struct dirent *direntry = NULL;
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
if (numentries > 0){
3073
2272
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);
2273
direntry = direntries[i];
2274
char *fullname = NULL;
2275
ret = asprintf(&fullname, "%s/%s", tempdir,
2278
perror_plus("asprintf");
2281
ret = remove(fullname);
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2290
/* need to clean even if 0 because man page doesn't specify */
2292
if (numentries == -1){
2293
perror_plus("scandir");
2295
ret = rmdir(tempdir);
2296
if(ret == -1 and errno != ENOENT){
2297
perror_plus("rmdir");