569
534
/* GnuTLS server initialization */
570
ret = gnutls_dh_params_init(&mc->dh_params);
535
ret = gnutls_dh_params_init(&mc.dh_params);
571
536
if(ret != GNUTLS_E_SUCCESS){
572
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
538
" initialization: %s\n",
574
539
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;
616
ret = close(dhpfile);
618
perror_plus("close");
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
623
if(dhparamsfilename == NULL){
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
643
int secfile = open(seckeyfilename, O_RDONLY);
648
size_t buffer_capacity = 0;
650
buffer_capacity = incbuffer((char **)&buffer.data,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
666
/* check bytes_read for failure */
673
buffer.size += (unsigned int)bytes_read;
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
686
safer_gnutls_strerror(ret));
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
700
/* Use private key to suggest an appropriate
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
717
fprintf_plus(stderr, "Falling back to security parameter"
719
safe_string(gnutls_sec_param_get_name
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
739
safer_gnutls_strerror(ret));
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
760
gnutls_certificate_free_credentials(mc->cred);
761
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
765
__attribute__((nonnull, warn_unused_result))
766
static int init_gnutls_session(gnutls_session_t *session,
561
static int init_gnutls_session(gnutls_session_t *session){
769
563
/* GnuTLS session creation */
822
618
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
823
619
__attribute__((unused)) const char *txt){}
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
830
if(seteuid(0) == -1){
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
858
if(seteuid(uid) == -1){
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
870
if(setuid(uid) == -1){
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
881
AvahiIfIndex if_index){
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
920
perror_plus("setgid");
923
/* Reset supplementary groups */
925
ret = setgroups(0, NULL);
927
perror_plus("setgroups");
931
ret = dup2(devnull, STDIN_FILENO);
933
perror_plus("dup2(devnull, STDIN_FILENO)");
936
ret = close(devnull);
938
perror_plus("close");
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
951
if(helperdir_fd == -1){
953
_exit(EX_UNAVAILABLE);
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
perror_plus("openat");
960
_exit(EX_UNAVAILABLE);
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
972
#pragma GCC diagnostic pop
974
perror_plus("fexecve");
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
994
if(kill(pid, SIGTERM) == -1){
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
1003
} while(pret == -1 and errno == EINTR);
1005
perror_plus("waitpid");
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1031
return add_delete_local_route(true, address, if_index);
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1040
return add_delete_local_route(false, address, if_index);
1043
621
/* Called when a Mandos server is found */
1044
__attribute__((nonnull, warn_unused_result))
1045
static int start_mandos_communication(const char *ip, in_port_t port,
622
static int start_mandos_communication(const char *ip, uint16_t port,
1046
623
AvahiIfIndex if_index,
1047
int af, mandos_context *mc){
1048
625
int ret, tcp_sd = -1;
1050
struct sockaddr_storage to;
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
1051
631
char *buffer = NULL;
1052
632
char *decrypted_buffer = NULL;
1053
633
size_t buffer_length = 0;
1183
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1184
735
perror_plus("if_indextoname");
1186
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1187
"\n", ip, interface, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
1190
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1191
ip, (uintmax_t)port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
1193
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1194
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in6),
1198
addrstr, sizeof(addrstr), NULL, 0,
1201
ret = getnameinfo((struct sockaddr *)&to,
1202
sizeof(struct sockaddr_in),
1203
addrstr, sizeof(addrstr), NULL, 0,
1206
if(ret == EAI_SYSTEM){
1207
perror_plus("getnameinfo");
1208
} else if(ret != 0) {
1209
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1210
} else if(strcmp(addrstr, ip) != 0){
1211
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1256
route_added = add_local_route(ip, if_index);
1262
if(errno != ECONNREFUSED or debug){
1264
perror_plus("connect");
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
755
perror_plus("inet_ntop");
757
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
776
perror_plus("connect");
1277
787
const char *out = mandos_protocol_version;
1747
* This function determines if a network interface is up.
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_up(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_UP);
1764
* This function determines if a network interface is running
1766
__attribute__((nonnull, warn_unused_result))
1767
bool interface_is_running(const char *interface){
1769
if(not get_flags(interface, &ifr)){
1771
fprintf_plus(stderr, "Failed to get flags for interface "
1772
"\"%s\"\n", interface);
1777
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1780
__attribute__((nonnull, pure, warn_unused_result))
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1219
if(not get_flags(if_entry->d_name, &ifr)){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1245
if(not good_flags(if_entry->d_name, &ifr)){
1781
1251
int notdotentries(const struct dirent *direntry){
1782
1252
/* Skip "." and ".." */
1783
1253
if(direntry->d_name[0] == '.'
1911
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1914
if(ret > 0 or errno != EINTR){
1388
if (ret > 0 or errno != EINTR){
1915
1389
return (ret != 1) ? ret : 0;
1921
__attribute__((nonnull))
1922
void run_network_hooks(const char *mode, const char *interface,
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1438
bool run_network_hooks(const char *mode, const char *interface,
1923
1439
const float delay){
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1935
perror_plus("open");
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1947
1445
if(numhooks == -1){
1948
1446
perror_plus("scandir");
1952
struct dirent *direntry;
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1960
pid_t hook_pid = fork();
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1966
perror_plus("Failed to raise privileges");
1973
perror_plus("setgid");
1976
/* Reset supplementary groups */
1978
ret = setgroups(0, NULL);
1980
perror_plus("setgroups");
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1985
perror_plus("setenv");
1988
ret = setenv("DEVICE", interface, 1);
1990
perror_plus("setenv");
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1995
perror_plus("setenv");
1998
ret = setenv("MODE", mode, 1);
2000
perror_plus("setenv");
2004
ret = asprintf(&delaystring, "%f", (double)delay);
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
2006
1454
perror_plus("asprintf");
2009
ret = setenv("DELAY", delaystring, 1);
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1461
pid_t hook_pid = fork();
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1470
perror_plus("setgid");
1472
/* Reset supplementary groups */
1474
ret = setgroups(0, NULL);
1476
perror_plus("setgroups");
1478
dup2(devnull, STDIN_FILENO);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1483
perror_plus("setenv");
1486
ret = setenv("DEVICE", interface, 1);
1488
perror_plus("setenv");
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1493
perror_plus("setenv");
1496
ret = setenv("MODE", mode, 1);
1498
perror_plus("setenv");
1502
ret = asprintf(&delaystring, "%f", delay);
1504
perror_plus("asprintf");
1507
ret = setenv("DELAY", delaystring, 1);
1510
perror_plus("setenv");
2011
1513
free(delaystring);
2012
perror_plus("setenv");
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2019
perror_plus("setenv");
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2034
ret = dup2(devnull, STDIN_FILENO);
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
ret = close(devnull);
2041
perror_plus("close");
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2056
perror_plus("fork");
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1517
perror_plus("setenv");
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2102
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2105
int old_errno = errno;
1564
int bring_up_interface(const char * const interface, const float delay){
2107
1567
struct ifreq network;
2108
unsigned int if_index = if_nametoindex(interface);
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
2109
1569
if(if_index == 0){
2110
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1571
return EX_UNAVAILABLE;
2120
if(not interface_is_up(interface)){
2122
int ioctl_errno = 0;
2123
if(not get_flags(interface, &network)){
2125
fprintf_plus(stderr, "Failed to get flags for interface "
2126
"\"%s\"\n", interface);
2130
network.ifr_flags |= IFF_UP; /* set flag */
2132
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2135
perror_plus("socket");
2143
perror_plus("close");
2150
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2154
/* Raise privileges */
2155
ret_errno = raise_privileges();
2158
perror_plus("Failed to raise privileges");
2163
bool restore_loglevel = false;
2165
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2166
messages about the network interface to mess up the prompt */
2167
ret_linux = klogctl(8, NULL, 5);
2168
if(ret_linux == -1){
2169
perror_plus("klogctl");
2171
restore_loglevel = true;
2174
#endif /* __linux__ */
2175
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2176
ioctl_errno = errno;
2178
if(restore_loglevel){
2179
ret_linux = klogctl(7, NULL, 0);
2180
if(ret_linux == -1){
2181
perror_plus("klogctl");
2184
#endif /* __linux__ */
2186
/* If raise_privileges() succeeded above */
2188
/* Lower privileges */
2189
ret_errno = lower_privileges();
2192
perror_plus("Failed to lower privileges");
2196
/* Close the socket */
1578
/* Re-raise priviliges */
1582
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1583
messages about the network interface to mess up the prompt */
1584
ret = klogctl(8, NULL, 5);
1585
bool restore_loglevel = true;
1587
restore_loglevel = false;
1588
perror_plus("klogctl");
1590
#endif /* __linux__ */
1592
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1594
perror_plus("socket");
1596
if(restore_loglevel){
1597
ret = klogctl(7, NULL, 0);
1599
perror_plus("klogctl");
1602
#endif /* __linux__ */
1603
/* Lower privileges */
1608
strcpy(network.ifr_name, interface);
1609
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1611
perror_plus("ioctl SIOCGIFFLAGS");
1613
if(restore_loglevel){
1614
ret = klogctl(7, NULL, 0);
1616
perror_plus("klogctl");
1619
#endif /* __linux__ */
1620
/* Lower privileges */
1624
if((network.ifr_flags & IFF_UP) == 0){
1625
network.ifr_flags |= IFF_UP;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2199
perror_plus("close");
2202
if(ret_setflags == -1){
2203
errno = ioctl_errno;
2204
1628
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
if(restore_loglevel){
1631
ret = klogctl(7, NULL, 0);
1633
perror_plus("klogctl");
1636
#endif /* __linux__ */
1637
/* Lower privileges */
2209
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2213
1642
/* Sleep checking until interface is running.
2214
1643
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
2216
if(interface_is_running(interface)){
1644
for(int i=0; i < delay * 4; i++){
1645
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1647
perror_plus("ioctl SIOCGIFFLAGS");
1648
} else if(network.ifr_flags & IFF_RUNNING){
2219
1651
struct timespec sleeptime = { .tv_nsec = 250000000 };
2222
1654
perror_plus("nanosleep");
2230
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2233
struct ifreq network;
2234
unsigned int if_index = if_nametoindex(interface);
2236
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1660
perror_plus("close");
2240
if(interface_is_up(interface)){
2242
int ioctl_errno = 0;
2243
if(not get_flags(interface, &network) and debug){
2245
fprintf_plus(stderr, "Failed to get flags for interface "
2246
"\"%s\"\n", interface);
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2252
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
perror_plus("socket");
2261
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2265
/* Raise privileges */
2266
ret_errno = raise_privileges();
2269
perror_plus("Failed to raise privileges");
2272
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2273
ioctl_errno = errno;
2275
/* If raise_privileges() succeeded above */
2277
/* Lower privileges */
2278
ret_errno = lower_privileges();
2281
perror_plus("Failed to lower privileges");
2285
/* Close the socket */
2286
int ret = close(sd);
1663
if(restore_loglevel){
1664
/* Restores kernel loglevel to default */
1665
ret = klogctl(7, NULL, 0);
2288
perror_plus("close");
2291
if(ret_setflags == -1){
2292
errno = ioctl_errno;
2293
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2298
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1667
perror_plus("klogctl");
1670
#endif /* __linux__ */
1671
/* Lower privileges */
2306
1676
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
2312
1677
AvahiSServiceBrowser *sb = NULL;
2315
1680
intmax_t tmpmax;
2317
1682
int exitcode = EXIT_SUCCESS;
2318
char *interfaces_to_take_down = NULL;
2319
size_t interfaces_to_take_down_size = 0;
2320
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2321
char old_tempdir[] = "/tmp/mandosXXXXXX";
2322
char *tempdir = NULL;
1683
const char *interface = "";
1684
struct ifreq network;
1686
bool take_down_interface = false;
1687
char tempdir[] = "/tmp/mandosXXXXXX";
1688
bool tempdir_created = false;
2323
1689
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
1690
const char *seckey = PATHDIR "/" SECKEY;
2325
1691
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
char *interfaces_hooks = NULL;
2329
1693
bool gnutls_initialized = false;
2330
1694
bool gpgme_initialized = false;
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2577
perror_plus("fstat");
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2583
perror_plus("fchown");
1913
TEMP_FAILURE_RETRY(close(pubkey_fd));
2591
1917
/* Lower privileges */
2592
ret = lower_privileges();
2595
perror_plus("Failed to lower privileges");
2600
/* Remove invalid interface names (except "none") */
2602
char *interface = NULL;
2603
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2605
if(strcmp(interface, "none") != 0
2606
and if_nametoindex(interface) == 0){
2607
if(interface[0] != '\0'){
2608
fprintf_plus(stderr, "Not using nonexisting interface"
2609
" \"%s\"\n", interface);
2611
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
1921
perror_plus("seteuid");
2617
1926
/* Run network hooks */
2619
if(mc.interfaces != NULL){
2620
interfaces_hooks = malloc(mc.interfaces_size);
2621
if(interfaces_hooks == NULL){
1927
if(not run_network_hooks("start", interface, delay)){
1932
avahi_set_log_function(empty_log);
1935
if(interface[0] == '\0'){
1936
struct dirent **direntries;
1937
/* First look for interfaces that are up */
1938
ret = scandir(sys_class_net, &direntries, up_interface,
1941
/* No up interfaces, look for any good interfaces */
1943
ret = scandir(sys_class_net, &direntries, good_interface,
1947
/* Pick the first interface returned */
1948
interface = strdup(direntries[0]->d_name);
1950
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1952
if(interface == NULL){
2622
1953
perror_plus("malloc");
1955
exitcode = EXIT_FAILURE;
2625
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2626
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1961
fprintf_plus(stderr, "Could not find a network interface\n");
1962
exitcode = EXIT_FAILURE;
2628
run_network_hooks("start", interfaces_hooks != NULL ?
2629
interfaces_hooks : "", delay);
2633
avahi_set_log_function(empty_log);
2636
1967
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2637
1968
from the signal handler */
2638
1969
/* Initialize the pseudo-RNG for Avahi */
2639
1970
srand((unsigned int) time(NULL));
2640
simple_poll = avahi_simple_poll_new();
2641
if(simple_poll == NULL){
1971
mc.simple_poll = avahi_simple_poll_new();
1972
if(mc.simple_poll == NULL){
2642
1973
fprintf_plus(stderr,
2643
1974
"Avahi: Failed to create simple poll object.\n");
2644
1975
exitcode = EX_UNAVAILABLE;
2711
/* If no interfaces were specified, make a list */
2712
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2714
/* Look for any good interfaces */
2715
ret = scandir(sys_class_net, &direntries, good_interface,
2718
/* Add all found interfaces to interfaces list */
2719
for(int i = 0; i < ret; ++i){
2720
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2721
direntries[i]->d_name);
2724
perror_plus("argz_add");
2725
free(direntries[i]);
2729
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
direntries[i]->d_name);
2732
free(direntries[i]);
2739
fprintf_plus(stderr, "Could not find a network interface\n");
2740
exitcode = EXIT_FAILURE;
2745
/* Bring up interfaces which are down, and remove any "none"s */
2747
char *interface = NULL;
2748
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2750
/* If interface name is "none", stop bringing up interfaces.
2751
Also remove all instances of "none" from the list */
2752
if(strcmp(interface, "none") == 0){
2753
argz_delete(&mc.interfaces, &mc.interfaces_size,
2756
while((interface = argz_next(mc.interfaces,
2757
mc.interfaces_size, interface))){
2758
if(strcmp(interface, "none") == 0){
2759
argz_delete(&mc.interfaces, &mc.interfaces_size,
2766
bool interface_was_up = interface_is_up(interface);
2767
errno = bring_up_interface(interface, delay);
2768
if(not interface_was_up){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2773
errno = argz_add(&interfaces_to_take_down,
2774
&interfaces_to_take_down_size,
2777
perror_plus("argz_add");
2782
if(debug and (interfaces_to_take_down == NULL)){
2783
fprintf_plus(stderr, "No interfaces were brought up\n");
2787
/* If we only got one interface, explicitly use only that one */
2788
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2790
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2793
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2042
/* If the interface is down, bring it up */
2043
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2044
ret = bring_up_interface(interface, delay);
2047
perror_plus("Failed to bring up interface");
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2055
ret = init_gnutls_global(pubkey, seckey);
2802
2057
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
2058
exitcode = EX_UNAVAILABLE;
3011
2250
mc.current_server->prev->next = NULL;
3012
2251
while(mc.current_server != NULL){
3013
2252
server *next = mc.current_server->next;
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3018
free((char *)(mc.current_server->ip));
3020
#pragma GCC diagnostic pop
3022
2253
free(mc.current_server);
3023
2254
mc.current_server = next;
3027
/* Re-raise privileges */
2258
/* Run network hooks */
2259
run_network_hooks("stop", interface, delay);
2261
/* Re-raise priviliges */
3029
ret = raise_privileges();
3032
perror_plus("Failed to raise privileges");
3035
/* Run network hooks */
3036
run_network_hooks("stop", interfaces_hooks != NULL ?
3037
interfaces_hooks : "", delay);
3039
/* Take down the network interfaces which were brought up */
3041
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3045
ret = take_down_interface(interface);
3048
perror_plus("Failed to take down interface");
3051
if(debug and (interfaces_to_take_down == NULL)){
3052
fprintf_plus(stderr, "No interfaces needed to be taken"
3058
ret = lower_privileges_permanently();
3061
perror_plus("Failed to lower privileges permanently");
2265
/* Take down the network interface */
2266
if(take_down_interface and geteuid() == 0){
2267
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2269
perror_plus("ioctl SIOCGIFFLAGS");
2270
} else if(network.ifr_flags & IFF_UP){
2271
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2272
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2279
perror_plus("close");
3065
free(interfaces_to_take_down);
3066
free(interfaces_hooks);
3068
void clean_dir_at(int base, const char * const dirname,
2283
/* Lower privileges permanently */
2287
perror_plus("setuid");
2290
/* Removes the GPGME temp directory and all files inside */
2291
if(tempdir_created){
3070
2292
struct dirent **direntries = NULL;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3078
perror_plus("open");
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
2293
struct dirent *direntry = NULL;
2294
int numentries = scandir(tempdir, &direntries, notdotentries,
2296
if (numentries > 0){
3084
2297
for(int i = 0; i < numentries; i++){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3107
free(direntries[i]);
3110
/* need to clean even if 0 because man page doesn't specify */
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3117
perror_plus("scandirat");
3122
/* Removes the GPGME temp directory and all files inside */
3123
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2298
direntry = direntries[i];
2299
char *fullname = NULL;
2300
ret = asprintf(&fullname, "%s/%s", tempdir,
2303
perror_plus("asprintf");
2306
ret = remove(fullname);
2308
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2315
/* need to clean even if 0 because man page doesn't specify */
2317
if (numentries == -1){
2318
perror_plus("scandir");
2320
ret = rmdir(tempdir);
2321
if(ret == -1 and errno != ENOENT){
2322
perror_plus("rmdir");