570
532
/* GnuTLS server initialization */
571
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
572
534
if(ret != GNUTLS_E_SUCCESS){
573
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
536
" initialization: %s\n",
575
537
safer_gnutls_strerror(ret));
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
586
buffer_capacity = incbuffer((char **)&buffer.data,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
601
/* check bytes_read for failure */
608
buffer.size += (unsigned int)bytes_read;
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
651
fprintf_plus(stderr, "Falling back to security parameter"
653
safe_string(gnutls_sec_param_get_name
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
680
541
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
692
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
693
554
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
559
static int init_gnutls_session(gnutls_session_t *session){
702
561
/* GnuTLS session creation */
757
616
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
617
__attribute__((unused)) const char *txt){}
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
812
/* Helper function to add_local_route() and delete_local_route() */
813
__attribute__((nonnull, warn_unused_result))
814
static bool add_delete_local_route(const bool add,
816
AvahiIfIndex if_index){
818
char helper[] = "mandos-client-iprouteadddel";
819
char add_arg[] = "add";
820
char delete_arg[] = "delete";
821
char debug_flag[] = "--debug";
822
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
823
if(pluginhelperdir == NULL){
825
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
826
" variable not set; cannot run helper\n");
831
char interface[IF_NAMESIZE];
832
if(if_indextoname((unsigned int)if_index, interface) == NULL){
833
perror_plus("if_indextoname");
837
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
839
perror_plus("open(\"/dev/null\", O_RDONLY)");
845
/* Raise privileges */
846
errno = raise_privileges_permanently();
848
perror_plus("Failed to raise privileges");
849
/* _exit(EX_NOPERM); */
855
perror_plus("setgid");
858
/* Reset supplementary groups */
860
ret = setgroups(0, NULL);
862
perror_plus("setgroups");
866
ret = dup2(devnull, STDIN_FILENO);
868
perror_plus("dup2(devnull, STDIN_FILENO)");
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
873
perror_plus("close");
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
878
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
881
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
886
if(helperdir_fd == -1){
888
_exit(EX_UNAVAILABLE);
890
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
893
perror_plus("openat");
894
_exit(EX_UNAVAILABLE);
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
898
#pragma GCC diagnostic push
899
#pragma GCC diagnostic ignored "-Wcast-qual"
901
if(fexecve(helper_fd, (char *const [])
902
{ helper, add ? add_arg : delete_arg, (char *)address,
903
interface, debug ? debug_flag : NULL, NULL },
906
#pragma GCC diagnostic pop
908
perror_plus("fexecve");
920
pret = waitpid(pid, &status, 0);
921
if(pret == -1 and errno == EINTR and quit_now){
922
int errno_raising = 0;
923
if((errno = raise_privileges()) != 0){
924
errno_raising = errno;
925
perror_plus("Failed to raise privileges in order to"
926
" kill helper program");
928
if(kill(pid, SIGTERM) == -1){
931
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
932
perror_plus("Failed to lower privileges after killing"
937
} while(pret == -1 and errno == EINTR);
939
perror_plus("waitpid");
942
if(WIFEXITED(status)){
943
if(WEXITSTATUS(status) != 0){
944
fprintf_plus(stderr, "Error: iprouteadddel exited"
945
" with status %d\n", WEXITSTATUS(status));
950
if(WIFSIGNALED(status)){
951
fprintf_plus(stderr, "Error: iprouteadddel died by"
952
" signal %d\n", WTERMSIG(status));
955
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
959
__attribute__((nonnull, warn_unused_result))
960
static bool add_local_route(const char *address,
961
AvahiIfIndex if_index){
963
fprintf_plus(stderr, "Adding route to %s\n", address);
965
return add_delete_local_route(true, address, if_index);
968
__attribute__((nonnull, warn_unused_result))
969
static bool delete_local_route(const char *address,
970
AvahiIfIndex if_index){
972
fprintf_plus(stderr, "Removing route to %s\n", address);
974
return add_delete_local_route(false, address, if_index);
977
619
/* Called when a Mandos server is found */
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
980
621
AvahiIfIndex if_index,
981
int af, mandos_context *mc){
982
623
int ret, tcp_sd = -1;
984
struct sockaddr_storage to;
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
985
629
char *buffer = NULL;
986
630
char *decrypted_buffer = NULL;
987
631
size_t buffer_length = 0;
1115
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1116
733
perror_plus("if_indextoname");
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
1125
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1126
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1128
ret = getnameinfo((struct sockaddr *)&to,
1129
sizeof(struct sockaddr_in6),
1130
addrstr, sizeof(addrstr), NULL, 0,
1133
ret = getnameinfo((struct sockaddr *)&to,
1134
sizeof(struct sockaddr_in),
1135
addrstr, sizeof(addrstr), NULL, 0,
1138
if(ret == EAI_SYSTEM){
1139
perror_plus("getnameinfo");
1140
} else if(ret != 0) {
1141
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1142
} else if(strcmp(addrstr, ip) != 0){
1143
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1154
ret = connect(tcp_sd, (struct sockaddr *)&to,
1155
sizeof(struct sockaddr_in6));
1157
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1158
sizeof(struct sockaddr_in));
1161
if(errno == ENETUNREACH
1162
and if_index != AVAHI_IF_UNSPEC
1163
and connect_to == NULL
1164
and not route_added and
1165
((af == AF_INET6 and not
1166
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1168
or (af == AF_INET and
1169
/* Not a a IPv4LL address */
1170
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1171
& 0xFFFF0000L) != 0xA9FE0000L))){
1172
/* Work around Avahi bug - Avahi does not announce link-local
1173
addresses if it has a global address, so local hosts with
1174
*only* a link-local address (e.g. Mandos clients) cannot
1175
connect to a Mandos server announced by Avahi on a server
1176
host with a global address. Work around this by retrying
1177
with an explicit route added with the server's address.
1179
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
https://bugs.debian.org/587961
1184
fprintf_plus(stderr, "Mandos server unreachable, trying"
1188
route_added = add_local_route(ip, if_index);
1194
if(errno != ECONNREFUSED or debug){
1196
perror_plus("connect");
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");
1209
785
const char *out = mandos_protocol_version;
1822
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1825
if(ret > 0 or errno != EINTR){
1383
if (ret > 0 or errno != EINTR){
1826
1384
return (ret != 1) ? ret : 0;
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1390
bool run_network_hooks(const char *mode, const char *interface,
1834
1391
const float delay){
1835
struct dirent **direntries = NULL;
1836
if(hookdir_fd == -1){
1837
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1839
if(hookdir_fd == -1){
1840
if(errno == ENOENT){
1842
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1843
" found\n", hookdir);
1846
perror_plus("open");
1852
#if __GLIBC_PREREQ(2, 15)
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1862
#endif /* not __GLIBC__ */
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1863
1397
if(numhooks == -1){
1864
1398
perror_plus("scandir");
1867
struct dirent *direntry;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1874
for(int i = 0; i < numhooks; i++){
1875
direntry = direntries[i];
1877
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1880
pid_t hook_pid = fork();
1883
/* Raise privileges */
1884
errno = raise_privileges_permanently();
1886
perror_plus("Failed to raise privileges");
1893
perror_plus("setgid");
1896
/* Reset supplementary groups */
1898
ret = setgroups(0, NULL);
1900
perror_plus("setgroups");
1903
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1905
perror_plus("setenv");
1908
ret = setenv("DEVICE", interface, 1);
1910
perror_plus("setenv");
1913
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1915
perror_plus("setenv");
1918
ret = setenv("MODE", mode, 1);
1920
perror_plus("setenv");
1924
ret = asprintf(&delaystring, "%f", (double)delay);
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);
1926
1406
perror_plus("asprintf");
1929
ret = setenv("DELAY", delaystring, 1);
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("VERBOSE", 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");
1931
1475
free(delaystring);
1932
perror_plus("setenv");
1936
if(connect_to != NULL){
1937
ret = setenv("CONNECT", connect_to, 1);
1939
perror_plus("setenv");
1943
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1947
perror_plus("openat");
1948
_exit(EXIT_FAILURE);
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1951
perror_plus("close");
1952
_exit(EXIT_FAILURE);
1954
ret = dup2(devnull, STDIN_FILENO);
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1961
perror_plus("close");
1964
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1966
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1969
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1971
perror_plus("fexecve");
1972
_exit(EXIT_FAILURE);
1976
perror_plus("fork");
1981
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1982
perror_plus("waitpid");
1986
if(WIFEXITED(status)){
1987
if(WEXITSTATUS(status) != 0){
1988
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1989
" with status %d\n", direntry->d_name,
1990
WEXITSTATUS(status));
1994
} else if(WIFSIGNALED(status)){
1995
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1996
" signal %d\n", direntry->d_name,
2001
fprintf_plus(stderr, "Warning: network hook \"%s\""
2002
" crashed\n", direntry->d_name);
2008
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2025
error_t old_errno = errno;
2027
struct ifreq network;
2028
unsigned int if_index = if_nametoindex(interface);
2030
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2040
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network)){
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2049
network.ifr_flags |= IFF_UP; /* set flag */
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2054
perror_plus("socket");
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2062
perror_plus("close");
2069
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2073
/* Raise privileges */
2074
ret_errno = raise_privileges();
2077
perror_plus("Failed to raise privileges");
2082
bool restore_loglevel = false;
2084
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2085
messages about the network interface to mess up the prompt */
2086
ret_linux = klogctl(8, NULL, 5);
2087
if(ret_linux == -1){
2088
perror_plus("klogctl");
2090
restore_loglevel = true;
2093
#endif /* __linux__ */
2094
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2095
ioctl_errno = errno;
2097
if(restore_loglevel){
2098
ret_linux = klogctl(7, NULL, 0);
2099
if(ret_linux == -1){
2100
perror_plus("klogctl");
2103
#endif /* __linux__ */
2105
/* If raise_privileges() succeeded above */
2107
/* Lower privileges */
2108
ret_errno = lower_privileges();
2111
perror_plus("Failed to lower privileges");
2115
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2118
perror_plus("close");
2121
if(ret_setflags == -1){
2122
errno = ioctl_errno;
2123
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2128
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2132
/* Sleep checking until interface is running.
2133
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2135
if(interface_is_running(interface)){
2138
struct timespec sleeptime = { .tv_nsec = 250000000 };
2139
ret = nanosleep(&sleeptime, NULL);
2140
if(ret == -1 and errno != EINTR){
2141
perror_plus("nanosleep");
2149
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2152
struct ifreq network;
2153
unsigned int if_index = if_nametoindex(interface);
2155
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2159
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2161
if(not get_flags(interface, &network) and debug){
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2164
"\"%s\"\n", interface);
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2170
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2173
perror_plus("socket");
2179
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2183
/* Raise privileges */
2184
ret_errno = raise_privileges();
2187
perror_plus("Failed to raise privileges");
2190
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2191
ioctl_errno = errno;
2193
/* If raise_privileges() succeeded above */
2195
/* Lower privileges */
2196
ret_errno = lower_privileges();
2199
perror_plus("Failed to lower privileges");
2203
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2206
perror_plus("close");
2209
if(ret_setflags == -1){
2210
errno = ioctl_errno;
2211
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2216
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
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",
2224
1526
int main(int argc, char *argv[]){
2225
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2229
1527
AvahiSServiceBrowser *sb = NULL;
2232
1530
intmax_t tmpmax;
2234
1532
int exitcode = EXIT_SUCCESS;
2235
char *interfaces_to_take_down = NULL;
2236
size_t interfaces_to_take_down_size = 0;
2237
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2238
char old_tempdir[] = "/tmp/mandosXXXXXX";
2239
char *tempdir = NULL;
1533
const char *interface = "";
1534
struct ifreq network;
1536
bool take_down_interface = false;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
2240
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
1542
const char *seckey = PATHDIR "/" SECKEY;
2242
1543
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
2245
1545
bool gnutls_initialized = false;
2246
1546
bool gpgme_initialized = false;
2473
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
2477
1773
/* Lower privileges */
2478
ret_errno = lower_privileges();
2481
perror_plus("Failed to lower privileges");
2486
/* Remove invalid interface names (except "none") */
2488
char *interface = NULL;
2489
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2491
if(strcmp(interface, "none") != 0
2492
and if_nametoindex(interface) == 0){
2493
if(interface[0] != '\0'){
2494
fprintf_plus(stderr, "Not using nonexisting interface"
2495
" \"%s\"\n", interface);
2497
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
1777
perror_plus("seteuid");
2503
1782
/* Run network hooks */
2505
if(mc.interfaces != NULL){
2506
interfaces_hooks = malloc(mc.interfaces_size);
2507
if(interfaces_hooks == NULL){
2508
perror_plus("malloc");
2511
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2512
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2514
run_network_hooks("start", interfaces_hooks != NULL ?
2515
interfaces_hooks : "", delay);
1783
if(not run_network_hooks("start", interface, delay)){
2519
1788
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;
2522
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2523
1824
from the signal handler */
2524
1825
/* Initialize the pseudo-RNG for Avahi */
2525
1826
srand((unsigned int) time(NULL));
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2528
1829
fprintf_plus(stderr,
2529
1830
"Avahi: Failed to create simple poll object.\n");
2530
1831
exitcode = EX_UNAVAILABLE;
2597
/* If no interfaces were specified, make a list */
2598
if(mc.interfaces == NULL){
2599
struct dirent **direntries = NULL;
2600
/* Look for any good interfaces */
2601
ret = scandir(sys_class_net, &direntries, good_interface,
2604
/* Add all found interfaces to interfaces list */
2605
for(int i = 0; i < ret; ++i){
2606
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2607
direntries[i]->d_name);
2610
perror_plus("argz_add");
2611
free(direntries[i]);
2615
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2616
direntries[i]->d_name);
2618
free(direntries[i]);
2625
fprintf_plus(stderr, "Could not find a network interface\n");
2626
exitcode = EXIT_FAILURE;
2631
/* Bring up interfaces which are down, and remove any "none"s */
2633
char *interface = NULL;
2634
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2636
/* If interface name is "none", stop bringing up interfaces.
2637
Also remove all instances of "none" from the list */
2638
if(strcmp(interface, "none") == 0){
2639
argz_delete(&mc.interfaces, &mc.interfaces_size,
2642
while((interface = argz_next(mc.interfaces,
2643
mc.interfaces_size, interface))){
2644
if(strcmp(interface, "none") == 0){
2645
argz_delete(&mc.interfaces, &mc.interfaces_size,
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");
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){
2652
bool interface_was_up = interface_is_up(interface);
2653
errno = bring_up_interface(interface, delay);
2654
if(not interface_was_up){
2656
perror_plus("Failed to bring up interface");
2658
errno = argz_add(&interfaces_to_take_down,
2659
&interfaces_to_take_down_size,
2662
perror_plus("argz_add");
2667
if(debug and (interfaces_to_take_down == NULL)){
2668
fprintf_plus(stderr, "No interfaces were brought up\n");
2672
/* If we only got one interface, explicitly use only that one */
2673
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2675
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2678
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
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");
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2039
ret = init_gnutls_global(pubkey, seckey);
2687
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
2042
exitcode = EX_UNAVAILABLE;
2891
2233
mc.current_server->prev->next = NULL;
2892
2234
while(mc.current_server != NULL){
2893
2235
server *next = mc.current_server->next;
2895
#pragma GCC diagnostic push
2896
#pragma GCC diagnostic ignored "-Wcast-qual"
2898
free((char *)(mc.current_server->ip));
2900
#pragma GCC diagnostic pop
2902
2236
free(mc.current_server);
2903
2237
mc.current_server = next;
2907
/* Re-raise privileges */
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2244
/* Re-raise priviliges */
2909
ret_errno = raise_privileges();
2912
perror_plus("Failed to raise privileges");
2915
/* Run network hooks */
2916
run_network_hooks("stop", interfaces_hooks != NULL ?
2917
interfaces_hooks : "", delay);
2919
/* Take down the network interfaces which were brought up */
2921
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2925
ret_errno = take_down_interface(interface);
2928
perror_plus("Failed to take down interface");
2931
if(debug and (interfaces_to_take_down == NULL)){
2932
fprintf_plus(stderr, "No interfaces needed to be taken"
2249
perror_plus("seteuid");
2938
ret_errno = lower_privileges_permanently();
2941
perror_plus("Failed to lower privileges permanently");
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");
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
2270
/* Lower privileges permanently */
2274
perror_plus("setuid");
2948
2277
/* Removes the GPGME temp directory and all files inside */
2949
if(tempdir != NULL){
2278
if(tempdir_created){
2950
2279
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2978
free(direntries[i]);
2981
/* need to clean even if 0 because man page doesn't specify */
2983
if(numentries == -1){
2984
perror_plus("scandir");
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
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,
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
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");