274
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
275
308
if(rc != GPG_ERR_NO_ERROR){
276
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
310
gpgme_strsource(rc), gpgme_strerror(rc));
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
321
"The total number of considered keys: %d\n",
322
import_result->considered);
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
363
fprintf_plus(stderr, "Key status:\n");
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
283
391
perror_plus("close");
532
644
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
645
ret = gnutls_dh_params_init(&mc->dh_params);
534
646
if(ret != GNUTLS_E_SUCCESS){
535
647
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
648
" initialization: %s\n",
537
649
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);
652
/* If a Diffie-Hellman parameters file was given, try to use it */
653
if(dhparamsfilename != NULL){
654
gnutls_datum_t params = { .data = NULL, .size = 0 };
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
659
dhparamsfilename = NULL;
662
size_t params_capacity = 0;
664
params_capacity = incbuffer((char **)¶ms.data,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
671
dhparamsfilename = NULL;
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
681
/* check bytes_read for failure */
686
dhparamsfilename = NULL;
689
params.size += (unsigned int)bytes_read;
691
ret = close(dhpfile);
693
perror_plus("close");
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
698
if(dhparamsfilename == NULL){
701
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
702
GNUTLS_X509_FMT_PEM);
703
if(ret != GNUTLS_E_SUCCESS){
704
fprintf_plus(stderr, "Failed to parse DH parameters in file"
705
" \"%s\": %s\n", dhparamsfilename,
706
safer_gnutls_strerror(ret));
707
dhparamsfilename = NULL;
712
if(dhparamsfilename == NULL){
713
if(mc->dh_bits == 0){
714
/* Find out the optimal number of DH bits */
715
/* Try to read the private key file */
716
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
718
int secfile = open(seckeyfilename, O_RDONLY);
723
size_t buffer_capacity = 0;
725
buffer_capacity = incbuffer((char **)&buffer.data,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
741
/* check bytes_read for failure */
748
buffer.size += (unsigned int)bytes_read;
752
/* If successful, use buffer to parse private key */
753
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
754
if(buffer.data != NULL){
756
gnutls_openpgp_privkey_t privkey = NULL;
757
ret = gnutls_openpgp_privkey_init(&privkey);
758
if(ret != GNUTLS_E_SUCCESS){
759
fprintf_plus(stderr, "Error initializing OpenPGP key"
761
safer_gnutls_strerror(ret));
765
ret = gnutls_openpgp_privkey_import
766
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
769
safer_gnutls_strerror(ret));
775
/* Use private key to suggest an appropriate
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
792
fprintf_plus(stderr, "Falling back to security parameter"
794
safe_string(gnutls_sec_param_get_name
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
803
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
804
" implies %u DH bits; using that.\n",
805
safe_string(gnutls_sec_param_get_name
810
fprintf_plus(stderr, "Failed to get implied number of DH"
811
" bits for security parameter \"%s\"): %s\n",
812
safe_string(gnutls_sec_param_get_name
814
safer_gnutls_strerror(ret));
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
821
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
822
if(ret != GNUTLS_E_SUCCESS){
823
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
824
" bits): %s\n", mc->dh_bits,
825
safer_gnutls_strerror(ret));
829
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);
835
gnutls_certificate_free_credentials(mc->cred);
836
gnutls_dh_params_deinit(mc->dh_params);
559
static int init_gnutls_session(gnutls_session_t *session){
840
__attribute__((nonnull, warn_unused_result))
841
static int init_gnutls_session(gnutls_session_t *session,
561
844
/* GnuTLS session creation */
616
897
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
898
__attribute__((unused)) const char *txt){}
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
905
if(seteuid(0) == -1){
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
933
if(seteuid(uid) == -1){
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
945
if(setuid(uid) == -1){
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
956
AvahiIfIndex if_index){
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
995
perror_plus("setgid");
998
/* Reset supplementary groups */
1000
ret = setgroups(0, NULL);
1002
perror_plus("setgroups");
1006
ret = dup2(devnull, STDIN_FILENO);
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1011
ret = close(devnull);
1013
perror_plus("close");
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1037
close(helperdir_fd);
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1047
#pragma GCC diagnostic pop
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1054
perror_plus("fork");
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1078
} while(pret == -1 and errno == EINTR);
1080
perror_plus("waitpid");
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1106
return add_delete_local_route(true, address, if_index);
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1115
return add_delete_local_route(false, address, if_index);
619
1118
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1119
__attribute__((nonnull, warn_unused_result))
1120
static int start_mandos_communication(const char *ip, in_port_t port,
621
1121
AvahiIfIndex if_index,
1122
int af, mandos_context *mc){
623
1123
int ret, tcp_sd = -1;
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
1125
struct sockaddr_storage to;
629
1126
char *buffer = NULL;
630
1127
char *decrypted_buffer = NULL;
631
1128
size_t buffer_length = 0;
732
1258
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1259
perror_plus("if_indextoname");
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1261
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1262
"\n", ip, interface, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
1265
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1266
ip, (uintmax_t)port);
742
1268
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1269
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");
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
1281
if(ret == EAI_SYSTEM){
1282
perror_plus("getnameinfo");
1283
} else if(ret != 0) {
1284
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1285
} else if(strcmp(addrstr, ip) != 0){
1286
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1331
route_added = add_local_route(ip, if_index);
1337
if(errno != ECONNREFUSED or debug){
1339
perror_plus("connect");
785
1352
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)){
1822
* This function determines if a network interface is up.
1824
__attribute__((nonnull, warn_unused_result))
1825
bool interface_is_up(const char *interface){
1827
if(not get_flags(interface, &ifr)){
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1835
return (bool)(ifr.ifr_flags & IFF_UP);
1839
* This function determines if a network interface is running
1841
__attribute__((nonnull, warn_unused_result))
1842
bool interface_is_running(const char *interface){
1844
if(not get_flags(interface, &ifr)){
1846
fprintf_plus(stderr, "Failed to get flags for interface "
1847
"\"%s\"\n", interface);
1852
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1855
__attribute__((nonnull, pure, warn_unused_result))
1246
1856
int notdotentries(const struct dirent *direntry){
1247
1857
/* Skip "." and ".." */
1248
1858
if(direntry->d_name[0] == '.'
1380
1986
ret = avahi_simple_poll_iterate(s, (int)block_time);
1383
if (ret > 0 or errno != EINTR){
1989
if(ret > 0 or errno != EINTR){
1384
1990
return (ret != 1) ? ret : 0;
1390
bool run_network_hooks(const char *mode, const char *interface,
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1391
1998
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2010
perror_plus("open");
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
1397
2022
if(numhooks == -1){
1398
2023
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);
2027
struct dirent *direntry;
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2035
pid_t hook_pid = fork();
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2041
perror_plus("Failed to raise privileges");
2048
perror_plus("setgid");
2051
/* Reset supplementary groups */
2053
ret = setgroups(0, NULL);
2055
perror_plus("setgroups");
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2060
perror_plus("setenv");
2063
ret = setenv("DEVICE", interface, 1);
2065
perror_plus("setenv");
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2070
perror_plus("setenv");
2073
ret = setenv("MODE", mode, 1);
2075
perror_plus("setenv");
2079
ret = asprintf(&delaystring, "%f", (double)delay);
1406
2081
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");
2084
ret = setenv("DELAY", delaystring, 1);
1475
2086
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
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",
2087
perror_plus("setenv");
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2094
perror_plus("setenv");
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2109
ret = dup2(devnull, STDIN_FILENO);
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2114
ret = close(devnull);
2116
perror_plus("close");
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2131
perror_plus("fork");
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2180
int old_errno = errno;
2182
struct ifreq network;
2183
unsigned int if_index = if_nametoindex(interface);
2185
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2195
if(not interface_is_up(interface)){
2197
int ioctl_errno = 0;
2198
if(not get_flags(interface, &network)){
2200
fprintf_plus(stderr, "Failed to get flags for interface "
2201
"\"%s\"\n", interface);
2205
network.ifr_flags |= IFF_UP; /* set flag */
2207
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2210
perror_plus("socket");
2218
perror_plus("close");
2225
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2229
/* Raise privileges */
2230
ret_errno = raise_privileges();
2233
perror_plus("Failed to raise privileges");
2238
bool restore_loglevel = false;
2240
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
messages about the network interface to mess up the prompt */
2242
ret_linux = klogctl(8, NULL, 5);
2243
if(ret_linux == -1){
2244
perror_plus("klogctl");
2246
restore_loglevel = true;
2249
#endif /* __linux__ */
2250
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2251
ioctl_errno = errno;
2253
if(restore_loglevel){
2254
ret_linux = klogctl(7, NULL, 0);
2255
if(ret_linux == -1){
2256
perror_plus("klogctl");
2259
#endif /* __linux__ */
2261
/* If raise_privileges() succeeded above */
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2267
perror_plus("Failed to lower privileges");
2271
/* Close the socket */
2274
perror_plus("close");
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2284
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2288
/* Sleep checking until interface is running.
2289
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
2291
if(interface_is_running(interface)){
2294
struct timespec sleeptime = { .tv_nsec = 250000000 };
2295
ret = nanosleep(&sleeptime, NULL);
2296
if(ret == -1 and errno != EINTR){
2297
perror_plus("nanosleep");
2305
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
2308
struct ifreq network;
2309
unsigned int if_index = if_nametoindex(interface);
2311
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2315
if(interface_is_up(interface)){
2317
int ioctl_errno = 0;
2318
if(not get_flags(interface, &network) and debug){
2320
fprintf_plus(stderr, "Failed to get flags for interface "
2321
"\"%s\"\n", interface);
2325
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2327
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2330
perror_plus("socket");
2336
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2340
/* Raise privileges */
2341
ret_errno = raise_privileges();
2344
perror_plus("Failed to raise privileges");
2347
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
ioctl_errno = errno;
2350
/* If raise_privileges() succeeded above */
2352
/* Lower privileges */
2353
ret_errno = lower_privileges();
2356
perror_plus("Failed to lower privileges");
2360
/* Close the socket */
2361
int ret = close(sd);
2363
perror_plus("close");
2366
if(ret_setflags == -1){
2367
errno = ioctl_errno;
2368
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2373
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1526
2381
int main(int argc, char *argv[]){
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
1527
2387
AvahiSServiceBrowser *sb = NULL;
1530
2390
intmax_t tmpmax;
1532
2392
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;
2393
char *interfaces_to_take_down = NULL;
2394
size_t interfaces_to_take_down_size = 0;
2395
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2396
char old_tempdir[] = "/tmp/mandosXXXXXX";
2397
char *tempdir = NULL;
1541
2398
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
2399
const char *seckey = PATHDIR "/" SECKEY;
1543
2400
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
char *interfaces_hooks = NULL;
1545
2404
bool gnutls_initialized = false;
1546
2405
bool gpgme_initialized = false;
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2652
perror_plus("fstat");
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2658
perror_plus("fchown");
1773
2666
/* Lower privileges */
1777
perror_plus("seteuid");
2667
ret = lower_privileges();
2670
perror_plus("Failed to lower privileges");
2675
/* Remove invalid interface names (except "none") */
2677
char *interface = NULL;
2678
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2680
if(strcmp(interface, "none") != 0
2681
and if_nametoindex(interface) == 0){
2682
if(interface[0] != '\0'){
2683
fprintf_plus(stderr, "Not using nonexisting interface"
2684
" \"%s\"\n", interface);
2686
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
1782
2692
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
2694
if(mc.interfaces != NULL){
2695
interfaces_hooks = malloc(mc.interfaces_size);
2696
if(interfaces_hooks == NULL){
2697
perror_plus("malloc");
2700
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2701
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2703
run_network_hooks("start", interfaces_hooks != NULL ?
2704
interfaces_hooks : "", delay);
1788
2708
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
2711
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2712
from the signal handler */
1825
2713
/* Initialize the pseudo-RNG for Avahi */
1826
2714
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2715
simple_poll = avahi_simple_poll_new();
2716
if(simple_poll == NULL){
1829
2717
fprintf_plus(stderr,
1830
2718
"Avahi: Failed to create simple poll object.\n");
1831
2719
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");
2786
/* If no interfaces were specified, make a list */
2787
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2789
/* Look for any good interfaces */
2790
ret = scandir(sys_class_net, &direntries, good_interface,
2793
/* Add all found interfaces to interfaces list */
2794
for(int i = 0; i < ret; ++i){
2795
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2796
direntries[i]->d_name);
2799
perror_plus("argz_add");
2800
free(direntries[i]);
2804
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
direntries[i]->d_name);
2807
free(direntries[i]);
2814
fprintf_plus(stderr, "Could not find a network interface\n");
2815
exitcode = EXIT_FAILURE;
2820
/* Bring up interfaces which are down, and remove any "none"s */
2822
char *interface = NULL;
2823
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2825
/* If interface name is "none", stop bringing up interfaces.
2826
Also remove all instances of "none" from the list */
2827
if(strcmp(interface, "none") == 0){
2828
argz_delete(&mc.interfaces, &mc.interfaces_size,
2831
while((interface = argz_next(mc.interfaces,
2832
mc.interfaces_size, interface))){
2833
if(strcmp(interface, "none") == 0){
2834
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");
2841
bool interface_was_up = interface_is_up(interface);
2842
errno = bring_up_interface(interface, delay);
2843
if(not interface_was_up){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2848
errno = argz_add(&interfaces_to_take_down,
2849
&interfaces_to_take_down_size,
2852
perror_plus("argz_add");
2857
if(debug and (interfaces_to_take_down == NULL)){
2858
fprintf_plus(stderr, "No interfaces were brought up\n");
2862
/* If we only got one interface, explicitly use only that one */
2863
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2865
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2868
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2039
ret = init_gnutls_global(pubkey, seckey);
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2041
2877
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2878
exitcode = EX_UNAVAILABLE;
2233
3086
mc.current_server->prev->next = NULL;
2234
3087
while(mc.current_server != NULL){
2235
3088
server *next = mc.current_server->next;
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3093
free((char *)(mc.current_server->ip));
3095
#pragma GCC diagnostic pop
2236
3097
free(mc.current_server);
2237
3098
mc.current_server = next;
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2244
/* Re-raise priviliges */
3102
/* Re-raise privileges */
2249
perror_plus("seteuid");
3104
ret = raise_privileges();
3107
perror_plus("Failed to raise privileges");
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3114
/* Take down the network interfaces which were brought up */
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3120
ret = take_down_interface(interface);
3123
perror_plus("Failed to take down interface");
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
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");
3133
ret = lower_privileges_permanently();
3136
perror_plus("Failed to lower privileges permanently");
2270
/* Lower privileges permanently */
2274
perror_plus("setuid");
3140
free(interfaces_to_take_down);
3141
free(interfaces_hooks);
3143
void clean_dir_at(int base, const char * const dirname,
3145
struct dirent **direntries = NULL;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3153
perror_plus("open");
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
3159
for(int i = 0; i < numentries; i++){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3182
free(direntries[i]);
3185
/* need to clean even if 0 because man page doesn't specify */
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3192
perror_plus("scandirat");
2277
3197
/* 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");
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);