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- Committer: Teddy Hogeborn
- Date: 2014-07-14 21:41:08 UTC
- Revision ID: teddy@recompile.se-20140714214108-awg7u6gaiy7d40dz
mandos-monitor: New "verbose" mode to see less important log messages.
* mandos-monitor (MandosClientWidget.__init__): Log client creation.
(MandosClientWidget.checker_completed): Log a successful checker.
(MandosClientWidget.checker_started): Log starting of a checker.
(UserInterface.__init__): New optional "log_level" argument.
(UserInterface.log_message, UserInterface.log_message_raw): Take
optional
"level"
arg.
(UserInterface.toggle_log_display): Log visibility change.
(UserInterface.change_log_display): Log wrap mode change.
(UserInterface.process_input): Show new "v" key in help message and
process "v" key if pressed.
* mandos-monitor.xml (KEYS): Document new "v" key.
* mandos-monitor (MandosClientWidget.__init__): Log client creation.
(MandosClientWidget.checker_completed): Log a successful checker.
(MandosClientWidget.checker_started): Log starting of a checker.
(UserInterface.__init__): New optional "log_level" argument.
(UserInterface.log_message, UserInterface.log_message_raw): Take
optional
"level"
arg.
(UserInterface.toggle_log_display): Log visibility change.
(UserInterface.change_log_display): Log wrap mode change.
(UserInterface.process_input): Show new "v" key in help message and
process "v" key if pressed.
* mandos-monitor.xml (KEYS): Document new "v" key.
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
240
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
241
if(ret == -1){
242
242
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
243
free(new_server->ip);
251
244
free(new_server);
252
245
return false;
253
246
}
305
298
return false;
306
299
}
307
300
308
ret = close(fd);
301
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
302
if(ret == -1){
310
303
perror_plus("close");
311
304
}
493
486
return plaintext_length;
494
487
}
495
488
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
489
__attribute__((warn_unused_result))
504
490
static const char *safer_gnutls_strerror(int value){
505
491
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
492
if(ret == NULL)
493
ret = "(unknown)";
494
return ret;
507
495
}
508
496
509
497
/* GnuTLS log function callback */
516
504
__attribute__((nonnull, warn_unused_result))
517
505
static int init_gnutls_global(const char *pubkeyfilename,
518
506
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
507
mandos_context *mc){
521
508
int ret;
522
unsigned int uret;
523
509
524
510
if(debug){
525
511
fprintf_plus(stderr, "Initializing GnuTLS\n");
576
562
safer_gnutls_strerror(ret));
577
563
goto globalfail;
578
564
}
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
}
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
566
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
569
goto globalfail;
570
}
571
751
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
573
753
574
return 0;
813
634
/* ignore client certificate if any. */
814
635
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
636
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
638
816
639
return 0;
817
640
}
818
641
820
643
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
644
__attribute__((unused)) const char *txt){}
822
645
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 = 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
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
1041
646
/* Called when a Mandos server is found */
1042
647
__attribute__((nonnull, warn_unused_result))
1043
648
static int start_mandos_communication(const char *ip, in_port_t port,
1054
659
int retval = -1;
1055
660
gnutls_session_t session;
1056
661
int pf; /* Protocol family */
1057
bool route_added = false;
1058
662
1059
663
errno = 0;
1060
664
1118
722
PRIuMAX "\n", ip, (uintmax_t)port);
1119
723
}
1120
724
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
725
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
726
if(tcp_sd < 0){
1123
727
int e = errno;
1124
728
perror_plus("socket");
1131
735
goto mandos_end;
1132
736
}
1133
737
738
memset(&to, 0, sizeof(to));
1134
739
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1138
742
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1142
745
}
1143
746
if(ret < 0 ){
1144
747
int e = errno;
1214
817
goto mandos_end;
1215
818
}
1216
819
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
820
if(af == AF_INET6){
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
823
} else {
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
826
}
827
if(ret < 0){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
int e = errno;
830
perror_plus("connect");
831
errno = e;
832
}
833
goto mandos_end;
834
}
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
1272
839
}
1273
840
1274
841
const char *out = mandos_protocol_version;
1457
1024
1458
1025
mandos_end:
1459
1026
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
1466
1027
int e = errno;
1467
1028
free(decrypted_buffer);
1468
1029
free(buffer);
1469
1030
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
1031
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1471
1032
}
1472
1033
if(ret == -1){
1473
1034
if(e == 0){
1508
1069
timed out */
1509
1070
1510
1071
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
1072
return;
1513
1073
}
1514
1074
1637
1197
errno = ret_errno;
1638
1198
return false;
1639
1199
}
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1200
strcpy(ifr->ifr_name, ifname);
1642
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
1202
if(ret == -1){
1644
1203
if(debug){
1895
1454
}
1896
1455
}
1897
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
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
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1898
1509
__attribute__((nonnull))
1899
1510
void run_network_hooks(const char *mode, const char *interface,
1900
1511
const float delay){
1901
1512
struct dirent **direntries = NULL;
1902
1513
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1904
| O_CLOEXEC);
1514
hookdir_fd = open(hookdir, O_RDONLY);
1905
1515
if(hookdir_fd == -1){
1906
1516
if(errno == ENOENT){
1907
1517
if(debug){
1932
1542
}
1933
1543
struct dirent *direntry;
1934
1544
int ret;
1935
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
if(devnull == -1){
1937
perror_plus("open(\"/dev/null\", O_RDONLY)");
1938
return;
1939
}
1545
int devnull = open("/dev/null", O_RDONLY);
1940
1546
for(int i = 0; i < numhooks; i++){
1941
1547
direntry = direntries[i];
1942
1548
if(debug){
1966
1572
perror_plus("setgroups");
1967
1573
_exit(EX_NOPERM);
1968
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
}
1969
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
1591
if(ret == -1){
1971
1592
perror_plus("setenv");
2006
1627
_exit(EX_OSERR);
2007
1628
}
2008
1629
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2012
1631
if(hook_fd == -1){
2013
1632
perror_plus("openat");
2014
1633
_exit(EXIT_FAILURE);
2015
1634
}
2016
if(close(hookdir_fd) == -1){
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2017
1636
perror_plus("close");
2018
1637
_exit(EXIT_FAILURE);
2019
1638
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
1640
environ) == -1){
2037
1641
perror_plus("fexecve");
2038
1642
_exit(EXIT_FAILURE);
2039
1643
}
2040
1644
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
1645
int status;
2047
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
1647
perror_plus("waitpid");
2049
free(direntry);
2050
1648
continue;
2051
1649
}
2052
1650
if(WIFEXITED(status)){
2054
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
1653
" with status %d\n", direntry->d_name,
2056
1654
WEXITSTATUS(status));
2057
free(direntry);
2058
1655
continue;
2059
1656
}
2060
1657
} else if(WIFSIGNALED(status)){
2061
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
1659
" signal %d\n", direntry->d_name,
2063
1660
WTERMSIG(status));
2064
free(direntry);
2065
1661
continue;
2066
1662
} else {
2067
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
1664
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
1665
continue;
2071
1666
}
2072
1667
}
2074
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
1670
direntry->d_name);
2076
1671
}
2077
free(direntry);
2078
1672
}
2079
1673
free(direntries);
2080
if(close(hookdir_fd) == -1){
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2081
1675
perror_plus("close");
2082
1676
} else {
2083
1677
hookdir_fd = -1;
2123
1717
}
2124
1718
2125
1719
if(quit_now){
2126
ret = close(sd);
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2127
1721
if(ret == -1){
2128
1722
perror_plus("close");
2129
1723
}
2179
1773
}
2180
1774
2181
1775
/* Close the socket */
2182
ret = close(sd);
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1777
if(ret == -1){
2184
1778
perror_plus("close");
2185
1779
}
2267
1861
}
2268
1862
2269
1863
/* Close the socket */
2270
int ret = close(sd);
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
1865
if(ret == -1){
2272
1866
perror_plus("close");
2273
1867
}
2288
1882
}
2289
1883
2290
1884
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
2296
1889
AvahiSServiceBrowser *sb = NULL;
2297
1890
error_t ret_errno;
2298
1891
int ret;
2307
1900
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1901
const char *seckey = PATHDIR "/" SECKEY;
2309
1902
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
1903
char *interfaces_hooks = NULL;
2312
1904
2313
1905
bool gnutls_initialized = false;
2366
1958
.doc = "Bit length of the prime number used in the"
2367
1959
" Diffie-Hellman key exchange",
2368
1960
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
2374
1961
{ .name = "priority", .key = 130,
2375
1962
.arg = "STRING",
2376
1963
.doc = "GnuTLS priority string for the TLS handshake",
2431
2018
}
2432
2019
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
2020
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
2021
case 130: /* --priority */
2438
2022
mc.priority = arg;
2439
2023
break;
2495
2079
goto end;
2496
2080
}
2497
2081
}
2498
2082
2499
2083
{
2500
2084
/* Work around Debian bug #633582:
2501
2085
<http://bugs.debian.org/633582> */
2525
2109
}
2526
2110
}
2527
2111
}
2528
close(seckey_fd);
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
2113
}
2530
2114
}
2531
2115
2532
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2534
2118
if(pubkey_fd == -1){
2546
2130
}
2547
2131
}
2548
2132
}
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
2575
2137
/* Lower privileges */
2576
2138
ret_errno = lower_privileges();
2577
2139
if(ret_errno != 0){
2706
2268
if(ret_errno != 0){
2707
2269
errno = ret_errno;
2708
2270
perror_plus("argz_add");
2709
free(direntries[i]);
2710
2271
continue;
2711
2272
}
2712
2273
if(debug){
2713
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
2275
direntries[i]->d_name);
2715
2276
}
2716
free(direntries[i]);
2717
2277
}
2718
2278
free(direntries);
2719
2279
} else {
2751
2311
errno = bring_up_interface(interface, delay);
2752
2312
if(not interface_was_up){
2753
2313
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2314
perror_plus("Failed to bring up interface");
2756
2315
} else {
2757
2316
errno = argz_add(&interfaces_to_take_down,
2758
2317
&interfaces_to_take_down_size,
2781
2340
goto end;
2782
2341
}
2783
2342
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
2344
if(ret == -1){
2786
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2346
exitcode = EX_UNAVAILABLE;
2990
2549
mc.current_server->prev->next = NULL;
2991
2550
while(mc.current_server != NULL){
2992
2551
server *next = mc.current_server->next;
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic push
2995
#pragma GCC diagnostic ignored "-Wcast-qual"
2996
#endif
2997
free((char *)(mc.current_server->ip));
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic pop
3000
#endif
3001
2552
free(mc.current_server);
3002
2553
mc.current_server = next;
3003
2554
}
3047
2598
/* Removes the GPGME temp directory and all files inside */
3048
2599
if(tempdir != NULL){
3049
2600
struct dirent **direntries = NULL;
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
| O_NOFOLLOW
3052
| O_DIRECTORY
3053
| O_PATH));
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
3054
2603
if(tempdir_fd == -1){
3055
2604
perror_plus("open");
3056
2605
} else {
3074
2623
" \"%s\", 0): %s\n", tempdir,
3075
2624
direntries[i]->d_name, strerror(errno));
3076
2625
}
3077
free(direntries[i]);
3078
2626
}
3079
2627
3080
2628
/* need to clean even if 0 because man page doesn't specify */
3087
2635
perror_plus("rmdir");
3088
2636
}
3089
2637
}
3090
close(tempdir_fd);
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
3091
2639
}
3092
2640
}
3093
2641
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0