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- Committer: Teddy Hogeborn
- Date: 2014-06-14 02:57:16 UTC
- Revision ID: teddy@recompile.se-20140614025716-i6887rk3u1iy9l67
In plugin-runner, protect against a larger FD_SETSIZE than fd_set.
* plugin-runner.c (main): Before forking, check that the first FD from
pipe() does not exceed FD_SETSIZE.
* plugin-runner.c (main): Before forking, check that the first FD from
pipe() does not exceed FD_SETSIZE.
- files removed:
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
234
234
.af = af };
235
235
if(new_server->ip == NULL){
236
236
perror_plus("strdup");
237
free(new_server);
238
237
return false;
239
238
}
240
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
240
if(ret == -1){
242
241
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
242
return false;
253
243
}
254
244
/* Special case of first server */
493
483
return plaintext_length;
494
484
}
495
485
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
486
__attribute__((warn_unused_result))
504
487
static const char *safer_gnutls_strerror(int value){
505
488
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
507
492
}
508
493
509
494
/* GnuTLS log function callback */
516
501
__attribute__((nonnull, warn_unused_result))
517
502
static int init_gnutls_global(const char *pubkeyfilename,
518
503
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
504
mandos_context *mc){
521
505
int ret;
522
unsigned int uret;
523
506
524
507
if(debug){
525
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
576
559
safer_gnutls_strerror(ret));
577
560
goto globalfail;
578
561
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
566
goto globalfail;
567
}
568
751
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
570
753
571
return 0;
813
631
/* ignore client certificate if any. */
814
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
816
636
return 0;
817
637
}
818
638
820
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
641
__attribute__((unused)) const char *txt){}
822
642
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
643
/* Called when a Mandos server is found */
1041
644
__attribute__((nonnull, warn_unused_result))
1042
645
static int start_mandos_communication(const char *ip, in_port_t port,
1053
656
int retval = -1;
1054
657
gnutls_session_t session;
1055
658
int pf; /* Protocol family */
1056
bool route_added = false;
1057
659
1058
660
errno = 0;
1059
661
1117
719
PRIuMAX "\n", ip, (uintmax_t)port);
1118
720
}
1119
721
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
723
if(tcp_sd < 0){
1122
724
int e = errno;
1123
725
perror_plus("socket");
1212
814
goto mandos_end;
1213
815
}
1214
816
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(errno == ENETUNREACH
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
1270
836
}
1271
837
1272
838
const char *out = mandos_protocol_version;
1455
1021
1456
1022
mandos_end:
1457
1023
{
1458
if(route_added){
1459
if(not delete_local_route(ip, if_index)){
1460
fprintf_plus(stderr, "Failed to delete local route to %s on"
1461
" interface %d", ip, if_index);
1462
}
1463
}
1464
1024
int e = errno;
1465
1025
free(decrypted_buffer);
1466
1026
free(buffer);
1506
1066
timed out */
1507
1067
1508
1068
if(quit_now){
1509
avahi_s_service_resolver_free(r);
1510
1069
return;
1511
1070
}
1512
1071
1892
1451
}
1893
1452
}
1894
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1895
1510
__attribute__((nonnull))
1896
1511
void run_network_hooks(const char *mode, const char *interface,
1897
1512
const float delay){
1898
struct dirent **direntries = NULL;
1513
struct dirent **direntries;
1899
1514
if(hookdir_fd == -1){
1900
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1901
| O_CLOEXEC);
1515
hookdir_fd = open(hookdir, O_RDONLY);
1902
1516
if(hookdir_fd == -1){
1903
1517
if(errno == ENOENT){
1904
1518
if(debug){
1929
1543
}
1930
1544
struct dirent *direntry;
1931
1545
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1546
int devnull = open("/dev/null", O_RDONLY);
1937
1547
for(int i = 0; i < numhooks; i++){
1938
1548
direntry = direntries[i];
1939
1549
if(debug){
1944
1554
if(hook_pid == 0){
1945
1555
/* Child */
1946
1556
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1557
if(raise_privileges_permanently() != 0){
1949
1558
perror_plus("Failed to raise privileges");
1950
1559
_exit(EX_NOPERM);
1951
1560
}
1963
1572
perror_plus("setgroups");
1964
1573
_exit(EX_NOPERM);
1965
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1966
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
1591
if(ret == -1){
1968
1592
perror_plus("setenv");
2003
1627
_exit(EX_OSERR);
2004
1628
}
2005
1629
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2009
1631
if(hook_fd == -1){
2010
1632
perror_plus("openat");
2011
1633
_exit(EXIT_FAILURE);
2014
1636
perror_plus("close");
2015
1637
_exit(EXIT_FAILURE);
2016
1638
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
1640
environ) == -1){
2034
1641
perror_plus("fexecve");
2035
1642
_exit(EXIT_FAILURE);
2036
1643
}
2037
1644
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
1645
int status;
2044
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
1647
perror_plus("waitpid");
2046
free(direntry);
2047
1648
continue;
2048
1649
}
2049
1650
if(WIFEXITED(status)){
2051
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
1653
" with status %d\n", direntry->d_name,
2053
1654
WEXITSTATUS(status));
2054
free(direntry);
2055
1655
continue;
2056
1656
}
2057
1657
} else if(WIFSIGNALED(status)){
2058
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
1659
" signal %d\n", direntry->d_name,
2060
1660
WTERMSIG(status));
2061
free(direntry);
2062
1661
continue;
2063
1662
} else {
2064
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
1664
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
1665
continue;
2068
1666
}
2069
1667
}
2071
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
1670
direntry->d_name);
2073
1671
}
2074
free(direntry);
2075
1672
}
2076
free(direntries);
2077
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
1674
perror_plus("close");
2079
1675
} else {
2136
1732
/* Raise privileges */
2137
1733
ret_errno = raise_privileges();
2138
1734
if(ret_errno != 0){
2139
errno = ret_errno;
2140
1735
perror_plus("Failed to raise privileges");
2141
1736
}
2142
1737
2246
1841
/* Raise privileges */
2247
1842
ret_errno = raise_privileges();
2248
1843
if(ret_errno != 0){
2249
errno = ret_errno;
2250
1844
perror_plus("Failed to raise privileges");
2251
1845
}
2252
1846
2285
1879
}
2286
1880
2287
1881
int main(int argc, char *argv[]){
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2289
1883
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
1884
"+CTYPE-OPENPGP", .current_server = NULL,
2291
1885
.interfaces = NULL, .interfaces_size = 0 };
2292
1886
AvahiSServiceBrowser *sb = NULL;
2293
1887
error_t ret_errno;
2303
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2304
1898
const char *seckey = PATHDIR "/" SECKEY;
2305
1899
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
2307
1900
char *interfaces_hooks = NULL;
2308
1901
2309
1902
bool gnutls_initialized = false;
2362
1955
.doc = "Bit length of the prime number used in the"
2363
1956
" Diffie-Hellman key exchange",
2364
1957
.group = 2 },
2365
{ .name = "dh-params", .key = 134,
2366
.arg = "FILE",
2367
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2368
" for the Diffie-Hellman key exchange",
2369
.group = 2 },
2370
1958
{ .name = "priority", .key = 130,
2371
1959
.arg = "STRING",
2372
1960
.doc = "GnuTLS priority string for the TLS handshake",
2427
2015
}
2428
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2429
2017
break;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2432
break;
2433
2018
case 130: /* --priority */
2434
2019
mc.priority = arg;
2435
2020
break;
2491
2076
goto end;
2492
2077
}
2493
2078
}
2494
2079
2495
2080
{
2496
2081
/* Work around Debian bug #633582:
2497
2082
<http://bugs.debian.org/633582> */
2524
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2525
2110
}
2526
2111
}
2527
2112
2528
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2529
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2530
2115
if(pubkey_fd == -1){
2545
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2546
2131
}
2547
2132
}
2548
2549
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2550
int dhparams_fd = open(dh_params_file, O_RDONLY);
2551
if(dhparams_fd == -1){
2552
perror_plus("open");
2553
} else {
2554
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2555
if(ret == -1){
2556
perror_plus("fstat");
2557
} else {
2558
if(S_ISREG(st.st_mode)
2559
and st.st_uid == 0 and st.st_gid == 0){
2560
ret = fchown(dhparams_fd, uid, gid);
2561
if(ret == -1){
2562
perror_plus("fchown");
2563
}
2564
}
2565
}
2566
TEMP_FAILURE_RETRY(close(dhparams_fd));
2567
}
2568
}
2569
2133
2570
2134
/* Lower privileges */
2571
2135
ret_errno = lower_privileges();
2572
2136
if(ret_errno != 0){
2701
2265
if(ret_errno != 0){
2702
2266
errno = ret_errno;
2703
2267
perror_plus("argz_add");
2704
free(direntries[i]);
2705
2268
continue;
2706
2269
}
2707
2270
if(debug){
2708
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2709
2272
direntries[i]->d_name);
2710
2273
}
2711
free(direntries[i]);
2712
2274
}
2713
2275
free(direntries);
2714
2276
} else {
2715
if(ret == 0){
2716
free(direntries);
2717
}
2277
free(direntries);
2718
2278
fprintf_plus(stderr, "Could not find a network interface\n");
2719
2279
exitcode = EXIT_FAILURE;
2720
2280
goto end;
2746
2306
errno = bring_up_interface(interface, delay);
2747
2307
if(not interface_was_up){
2748
2308
if(errno != 0){
2749
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2750
" %s\n", interface, strerror(errno));
2309
perror_plus("Failed to bring up interface");
2751
2310
} else {
2752
2311
errno = argz_add(&interfaces_to_take_down,
2753
2312
&interfaces_to_take_down_size,
2776
2335
goto end;
2777
2336
}
2778
2337
2779
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
2780
2339
if(ret == -1){
2781
2340
fprintf_plus(stderr, "init_gnutls_global failed\n");
2782
2341
exitcode = EX_UNAVAILABLE;
2985
2544
mc.current_server->prev->next = NULL;
2986
2545
while(mc.current_server != NULL){
2987
2546
server *next = mc.current_server->next;
2988
#ifdef __GNUC__
2989
#pragma GCC diagnostic push
2990
#pragma GCC diagnostic ignored "-Wcast-qual"
2991
#endif
2992
free((char *)(mc.current_server->ip));
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic pop
2995
#endif
2996
2547
free(mc.current_server);
2997
2548
mc.current_server = next;
2998
2549
}
3002
2553
{
3003
2554
ret_errno = raise_privileges();
3004
2555
if(ret_errno != 0){
3005
errno = ret_errno;
3006
2556
perror_plus("Failed to raise privileges");
3007
2557
} else {
3008
2558
3031
2581
3032
2582
ret_errno = lower_privileges_permanently();
3033
2583
if(ret_errno != 0){
3034
errno = ret_errno;
3035
2584
perror_plus("Failed to lower privileges permanently");
3036
2585
}
3037
2586
}
3042
2591
/* Removes the GPGME temp directory and all files inside */
3043
2592
if(tempdir != NULL){
3044
2593
struct dirent **direntries = NULL;
3045
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3046
| O_NOFOLLOW
3047
| O_DIRECTORY
3048
| O_PATH));
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2595
O_NOFOLLOW));
3049
2596
if(tempdir_fd == -1){
3050
2597
perror_plus("open");
3051
2598
} else {
3061
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
2609
alphasort);
3063
2610
#endif /* not __GLIBC__ */
3064
if(numentries >= 0){
2611
if(numentries > 0){
3065
2612
for(int i = 0; i < numentries; i++){
3066
2613
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3067
2614
if(ret == -1){
3069
2616
" \"%s\", 0): %s\n", tempdir,
3070
2617
direntries[i]->d_name, strerror(errno));
3071
2618
}
3072
free(direntries[i]);
3073
2619
}
3074
2620
3075
2621
/* need to clean even if 0 because man page doesn't specify */
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0