532
567
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
568
ret = gnutls_dh_params_init(&mc->dh_params);
534
569
if(ret != GNUTLS_E_SUCCESS){
535
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
571
" initialization: %s\n",
537
572
safer_gnutls_strerror(ret));
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
dhparamsfilename = NULL;
585
size_t params_capacity = 0;
587
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
594
dhparamsfilename = NULL;
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
604
/* check bytes_read for failure */
609
dhparamsfilename = NULL;
612
params.size += (unsigned int)bytes_read;
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
617
if(dhparamsfilename == NULL){
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
int secfile = open(seckeyfilename, O_RDONLY);
641
size_t buffer_capacity = 0;
643
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
659
/* check bytes_read for failure */
666
buffer.size += (unsigned int)bytes_read;
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
safer_gnutls_strerror(ret));
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
693
/* Use private key to suggest an appropriate
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
fprintf_plus(stderr, "Falling back to security parameter"
712
safe_string(gnutls_sec_param_get_name
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
732
safer_gnutls_strerror(ret));
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
559
static int init_gnutls_session(gnutls_session_t *session){
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
561
762
/* GnuTLS session creation */
616
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
816
__attribute__((unused)) const char *txt){}
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
823
if(seteuid(0) == -1){
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
851
if(seteuid(uid) == -1){
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
863
if(setuid(uid) == -1){
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
874
AvahiIfIndex if_index){
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
913
perror_plus("setgid");
916
/* Reset supplementary groups */
918
ret = setgroups(0, NULL);
920
perror_plus("setgroups");
924
ret = dup2(devnull, STDIN_FILENO);
926
perror_plus("dup2(devnull, STDIN_FILENO)");
929
ret = close(devnull);
931
perror_plus("close");
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
if(helperdir_fd == -1){
946
_exit(EX_UNAVAILABLE);
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
perror_plus("openat");
953
_exit(EX_UNAVAILABLE);
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
965
#pragma GCC diagnostic pop
967
perror_plus("fexecve");
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
987
if(kill(pid, SIGTERM) == -1){
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
996
} while(pret == -1 and errno == EINTR);
998
perror_plus("waitpid");
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
return add_delete_local_route(true, address, if_index);
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
return add_delete_local_route(false, address, if_index);
619
1036
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
621
1039
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
623
1041
int ret, tcp_sd = -1;
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
1043
struct sockaddr_storage to;
629
1044
char *buffer = NULL;
630
1045
char *decrypted_buffer = NULL;
631
1046
size_t buffer_length = 0;
732
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1176
perror_plus("if_indextoname");
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
742
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
753
perror_plus("inet_ntop");
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
perror_plus("connect");
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
route_added = add_local_route(ip, if_index);
1254
if(errno != ECONNREFUSED or debug){
1256
perror_plus("connect");
785
1269
const char *out = mandos_protocol_version;
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1214
if(not get_flags(if_entry->d_name, &ifr)){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if(not good_flags(if_entry->d_name, &ifr)){
1730
* This function determines if a network interface is up.
1732
__attribute__((nonnull, warn_unused_result))
1733
bool interface_is_up(const char *interface){
1735
if(not get_flags(interface, &ifr)){
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1743
return (bool)(ifr.ifr_flags & IFF_UP);
1747
* This function determines if a network interface is running
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_running(const char *interface){
1752
if(not get_flags(interface, &ifr)){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1760
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
__attribute__((nonnull, pure, warn_unused_result))
1246
1764
int notdotentries(const struct dirent *direntry){
1247
1765
/* Skip "." and ".." */
1248
1766
if(direntry->d_name[0] == '.'
1380
1894
ret = avahi_simple_poll_iterate(s, (int)block_time);
1383
if (ret > 0 or errno != EINTR){
1897
if(ret > 0 or errno != EINTR){
1384
1898
return (ret != 1) ? ret : 0;
1390
bool run_network_hooks(const char *mode, const char *interface,
1904
__attribute__((nonnull))
1905
void run_network_hooks(const char *mode, const char *interface,
1391
1906
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1907
struct dirent **direntries = NULL;
1908
if(hookdir_fd == -1){
1909
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
if(hookdir_fd == -1){
1912
if(errno == ENOENT){
1914
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1915
" found\n", hookdir);
1918
perror_plus("open");
1923
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1924
runnable_hook, alphasort);
1397
1925
if(numhooks == -1){
1398
1926
perror_plus("scandir");
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1929
struct dirent *direntry;
1931
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
for(int i = 0; i < numhooks; i++){
1937
direntry = direntries[i];
1939
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
pid_t hook_pid = fork();
1945
/* Raise privileges */
1946
errno = raise_privileges_permanently();
1948
perror_plus("Failed to raise privileges");
1955
perror_plus("setgid");
1958
/* Reset supplementary groups */
1960
ret = setgroups(0, NULL);
1962
perror_plus("setgroups");
1965
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
perror_plus("setenv");
1970
ret = setenv("DEVICE", interface, 1);
1972
perror_plus("setenv");
1975
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
perror_plus("setenv");
1980
ret = setenv("MODE", mode, 1);
1982
perror_plus("setenv");
1986
ret = asprintf(&delaystring, "%f", (double)delay);
1406
1988
perror_plus("asprintf");
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1413
pid_t hook_pid = fork();
1416
/* Raise privileges */
1420
perror_plus("seteuid");
1422
/* Raise privileges even more */
1426
perror_plus("setuid");
1432
perror_plus("setgid");
1434
/* Reset supplementary groups */
1436
ret = setgroups(0, NULL);
1438
perror_plus("setgroups");
1440
dup2(devnull, STDIN_FILENO);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1445
perror_plus("setenv");
1448
ret = setenv("DEVICE", interface, 1);
1450
perror_plus("setenv");
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1455
perror_plus("setenv");
1458
ret = setenv("MODE", mode, 1);
1460
perror_plus("setenv");
1464
ret = asprintf(&delaystring, "%f", delay);
1466
perror_plus("asprintf");
1469
ret = setenv("DELAY", delaystring, 1);
1472
perror_plus("setenv");
1991
ret = setenv("DELAY", delaystring, 1);
1475
1993
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to);
1479
perror_plus("setenv");
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1994
perror_plus("setenv");
1998
if(connect_to != NULL){
1999
ret = setenv("CONNECT", connect_to, 1);
2001
perror_plus("setenv");
2005
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
perror_plus("openat");
2010
_exit(EXIT_FAILURE);
2012
if(close(hookdir_fd) == -1){
2013
perror_plus("close");
2014
_exit(EXIT_FAILURE);
2016
ret = dup2(devnull, STDIN_FILENO);
2018
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
ret = close(devnull);
2023
perror_plus("close");
2026
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
perror_plus("fexecve");
2034
_exit(EXIT_FAILURE);
2038
perror_plus("fork");
2043
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2044
perror_plus("waitpid");
2048
if(WIFEXITED(status)){
2049
if(WEXITSTATUS(status) != 0){
2050
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2051
" with status %d\n", direntry->d_name,
2052
WEXITSTATUS(status));
2056
} else if(WIFSIGNALED(status)){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2058
" signal %d\n", direntry->d_name,
2063
fprintf_plus(stderr, "Warning: network hook \"%s\""
2064
" crashed\n", direntry->d_name);
2070
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2076
if(close(hookdir_fd) == -1){
2077
perror_plus("close");
2084
__attribute__((nonnull, warn_unused_result))
2085
int bring_up_interface(const char *const interface,
2087
int old_errno = errno;
2089
struct ifreq network;
2090
unsigned int if_index = if_nametoindex(interface);
2092
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2102
if(not interface_is_up(interface)){
2104
int ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2112
network.ifr_flags |= IFF_UP; /* set flag */
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
perror_plus("socket");
2125
perror_plus("close");
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2140
perror_plus("Failed to raise privileges");
2145
bool restore_loglevel = false;
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2153
restore_loglevel = true;
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2166
#endif /* __linux__ */
2168
/* If raise_privileges() succeeded above */
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2174
perror_plus("Failed to lower privileges");
2178
/* Close the socket */
2181
perror_plus("close");
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2212
__attribute__((nonnull, warn_unused_result))
2213
int take_down_interface(const char *const interface){
2214
int old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
if(interface_is_up(interface)){
2224
int ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
perror_plus("socket");
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2251
perror_plus("Failed to raise privileges");
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2257
/* If raise_privileges() succeeded above */
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2263
perror_plus("Failed to lower privileges");
2267
/* Close the socket */
2268
int ret = close(sd);
2270
perror_plus("close");
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1526
2288
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509"
2291
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2292
.current_server = NULL, .interfaces = NULL,
2293
.interfaces_size = 0 };
1527
2294
AvahiSServiceBrowser *sb = NULL;
1530
2297
intmax_t tmpmax;
1532
2299
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1536
bool take_down_interface = false;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
2300
char *interfaces_to_take_down = NULL;
2301
size_t interfaces_to_take_down_size = 0;
2302
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2303
char old_tempdir[] = "/tmp/mandosXXXXXX";
2304
char *tempdir = NULL;
1541
2305
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
2306
const char *seckey = PATHDIR "/" SECKEY;
1543
2307
const char *pubkey = PATHDIR "/" PUBKEY;
2308
const char *dh_params_file = NULL;
2309
char *interfaces_hooks = NULL;
1545
2311
bool gnutls_initialized = false;
1546
2312
bool gpgme_initialized = false;
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
2551
if(dh_params_file != NULL
2552
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2553
int dhparams_fd = open(dh_params_file, O_RDONLY);
2554
if(dhparams_fd == -1){
2555
perror_plus("open");
2557
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
perror_plus("fstat");
2561
if(S_ISREG(st.st_mode)
2562
and st.st_uid == 0 and st.st_gid == 0){
2563
ret = fchown(dhparams_fd, uid, gid);
2565
perror_plus("fchown");
1773
2573
/* Lower privileges */
1777
perror_plus("seteuid");
2574
ret = lower_privileges();
2577
perror_plus("Failed to lower privileges");
2582
/* Remove invalid interface names (except "none") */
2584
char *interface = NULL;
2585
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
if(strcmp(interface, "none") != 0
2588
and if_nametoindex(interface) == 0){
2589
if(interface[0] != '\0'){
2590
fprintf_plus(stderr, "Not using nonexisting interface"
2591
" \"%s\"\n", interface);
2593
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
1782
2599
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
2601
if(mc.interfaces != NULL){
2602
interfaces_hooks = malloc(mc.interfaces_size);
2603
if(interfaces_hooks == NULL){
2604
perror_plus("malloc");
2607
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2608
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
run_network_hooks("start", interfaces_hooks != NULL ?
2611
interfaces_hooks : "", delay);
1788
2615
avahi_set_log_function(empty_log);
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1797
/* No up interfaces, look for any good interfaces */
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1808
if(interface == NULL){
1809
perror_plus("malloc");
1811
exitcode = EXIT_FAILURE;
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1823
2618
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2619
from the signal handler */
1825
2620
/* Initialize the pseudo-RNG for Avahi */
1826
2621
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2622
simple_poll = avahi_simple_poll_new();
2623
if(simple_poll == NULL){
1829
2624
fprintf_plus(stderr,
1830
2625
"Avahi: Failed to create simple poll object.\n");
1831
2626
exitcode = EX_UNAVAILABLE;
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1911
/* Re-raise priviliges */
1915
perror_plus("seteuid");
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1927
#endif /* __linux__ */
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1937
perror_plus("klogctl");
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1945
perror_plus("seteuid");
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1952
perror_plus("ioctl SIOCGIFFLAGS");
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1957
perror_plus("klogctl");
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1966
perror_plus("seteuid");
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1982
perror_plus("klogctl");
2693
/* If no interfaces were specified, make a list */
2694
if(mc.interfaces == NULL){
2695
struct dirent **direntries = NULL;
2696
/* Look for any good interfaces */
2697
ret = scandir(sys_class_net, &direntries, good_interface,
2700
/* Add all found interfaces to interfaces list */
2701
for(int i = 0; i < ret; ++i){
2702
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2703
direntries[i]->d_name);
2706
perror_plus("argz_add");
2707
free(direntries[i]);
2711
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2712
direntries[i]->d_name);
2714
free(direntries[i]);
2721
fprintf_plus(stderr, "Could not find a network interface\n");
2722
exitcode = EXIT_FAILURE;
2727
/* Bring up interfaces which are down, and remove any "none"s */
2729
char *interface = NULL;
2730
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
/* If interface name is "none", stop bringing up interfaces.
2733
Also remove all instances of "none" from the list */
2734
if(strcmp(interface, "none") == 0){
2735
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
while((interface = argz_next(mc.interfaces,
2739
mc.interfaces_size, interface))){
2740
if(strcmp(interface, "none") == 0){
2741
argz_delete(&mc.interfaces, &mc.interfaces_size,
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1990
perror_plus("seteuid");
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2014
perror_plus("close");
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2022
perror_plus("klogctl");
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2028
/* Lower privileges */
2031
perror_plus("seteuid");
2748
bool interface_was_up = interface_is_up(interface);
2749
errno = bring_up_interface(interface, delay);
2750
if(not interface_was_up){
2752
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2753
" %s\n", interface, strerror(errno));
2755
errno = argz_add(&interfaces_to_take_down,
2756
&interfaces_to_take_down_size,
2759
perror_plus("argz_add");
2764
if(debug and (interfaces_to_take_down == NULL)){
2765
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
/* If we only got one interface, explicitly use only that one */
2770
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2039
ret = init_gnutls_global(pubkey, seckey);
2782
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2041
2784
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2785
exitcode = EX_UNAVAILABLE;
2233
2987
mc.current_server->prev->next = NULL;
2234
2988
while(mc.current_server != NULL){
2235
2989
server *next = mc.current_server->next;
2991
#pragma GCC diagnostic push
2992
#pragma GCC diagnostic ignored "-Wcast-qual"
2994
free((char *)(mc.current_server->ip));
2996
#pragma GCC diagnostic pop
2236
2998
free(mc.current_server);
2237
2999
mc.current_server = next;
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2244
/* Re-raise priviliges */
3003
/* Re-raise privileges */
2249
perror_plus("seteuid");
3005
ret = raise_privileges();
3008
perror_plus("Failed to raise privileges");
3011
/* Run network hooks */
3012
run_network_hooks("stop", interfaces_hooks != NULL ?
3013
interfaces_hooks : "", delay);
3015
/* Take down the network interfaces which were brought up */
3017
char *interface = NULL;
3018
while((interface=argz_next(interfaces_to_take_down,
3019
interfaces_to_take_down_size,
3021
ret = take_down_interface(interface);
3024
perror_plus("Failed to take down interface");
3027
if(debug and (interfaces_to_take_down == NULL)){
3028
fprintf_plus(stderr, "No interfaces needed to be taken"
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2266
perror_plus("close");
3034
ret = lower_privileges_permanently();
3037
perror_plus("Failed to lower privileges permanently");
2270
/* Lower privileges permanently */
2274
perror_plus("setuid");
3041
free(interfaces_to_take_down);
3042
free(interfaces_hooks);
3044
void clean_dir_at(int base, const char * const dirname,
3046
struct dirent **direntries = NULL;
3048
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3054
perror_plus("open");
3056
int numentries = scandirat(dir_fd, ".", &direntries,
3057
notdotentries, alphasort);
3058
if(numentries >= 0){
3059
for(int i = 0; i < numentries; i++){
3061
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3062
dirname, direntries[i]->d_name);
3064
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3066
if(errno == EISDIR){
3067
dret = unlinkat(dir_fd, direntries[i]->d_name,
3070
if((dret == -1) and (errno == ENOTEMPTY)
3071
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3072
== 0) and (level == 0)){
3073
/* Recurse only in this special case */
3074
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3078
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3079
direntries[i]->d_name, strerror(errno));
3082
free(direntries[i]);
3085
/* need to clean even if 0 because man page doesn't specify */
3087
if(numentries == -1){
3088
perror_plus("scandirat");
3090
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3091
if(dret == -1 and errno != ENOENT){
3092
perror_plus("rmdir");
3095
perror_plus("scandirat");
2277
3100
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2290
perror_plus("asprintf");
2293
ret = remove(fullname);
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2302
/* need to clean even if 0 because man page doesn't specify */
2304
if (numentries == -1){
2305
perror_plus("scandir");
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
3101
if(tempdir != NULL){
3102
clean_dir_at(-1, tempdir, 0);