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- Committer: Teddy Hogeborn
- Date: 2014-10-05 20:08:58 UTC
- Revision ID: teddy@recompile.se-20141005200858-uw6lfgqq8lod1edf
Tags: version-1.6.9-1
* Makefile (version): Changed to "1.6.9".
* NEWS (Version 1.6.9): New entry.
* debian/changelog (1.6.9-1): - '' -
* NEWS (Version 1.6.9): New entry.
* debian/changelog (1.6.9-1): - '' -
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(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
58
inet_pton(), connect(),
60
59
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
62
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
62
*/
64
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
64
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
310
305
return false;
311
306
}
312
307
313
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
309
if(ret == -1){
315
310
perror_plus("close");
316
311
}
498
493
return plaintext_length;
499
494
}
500
495
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
496
__attribute__((warn_unused_result))
509
497
static const char *safer_gnutls_strerror(int value){
510
498
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
499
if(ret == NULL)
500
ret = "(unknown)";
501
return ret;
512
502
}
513
503
514
504
/* GnuTLS log function callback */
518
508
fprintf_plus(stderr, "GnuTLS: %s", string);
519
509
}
520
510
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
511
__attribute__((nonnull, warn_unused_result))
522
512
static int init_gnutls_global(const char *pubkeyfilename,
523
513
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
514
mandos_context *mc){
526
515
int ret;
527
unsigned int uret;
528
516
529
517
if(debug){
530
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
519
}
532
520
521
ret = gnutls_global_init();
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
525
return -1;
526
}
527
533
528
if(debug){
534
529
/* "Use a log level over 10 to enable all debugging options."
535
530
* - GnuTLS manual
543
538
if(ret != GNUTLS_E_SUCCESS){
544
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
540
safer_gnutls_strerror(ret));
541
gnutls_global_deinit();
546
542
return -1;
547
543
}
548
544
573
569
safer_gnutls_strerror(ret));
574
570
goto globalfail;
575
571
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
} while(false);
630
}
631
if(dhparamsfilename == NULL){
632
if(mc->dh_bits == 0){
633
/* Find out the optimal number of DH bits */
634
/* Try to read the private key file */
635
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
do {
637
int secfile = open(seckeyfilename, O_RDONLY);
638
if(secfile == -1){
639
perror_plus("open");
640
break;
641
}
642
size_t buffer_capacity = 0;
643
while(true){
644
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer.size,
646
(size_t)buffer_capacity);
647
if(buffer_capacity == 0){
648
perror_plus("incbuffer");
649
free(buffer.data);
650
buffer.data = NULL;
651
break;
652
}
653
ssize_t bytes_read = read(secfile,
654
buffer.data + buffer.size,
655
BUFFER_SIZE);
656
/* EOF */
657
if(bytes_read == 0){
658
break;
659
}
660
/* check bytes_read for failure */
661
if(bytes_read < 0){
662
perror_plus("read");
663
free(buffer.data);
664
buffer.data = NULL;
665
break;
666
}
667
buffer.size += (unsigned int)bytes_read;
668
}
669
close(secfile);
670
} while(false);
671
/* If successful, use buffer to parse private key */
672
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
673
if(buffer.data != NULL){
674
{
675
gnutls_openpgp_privkey_t privkey = NULL;
676
ret = gnutls_openpgp_privkey_init(&privkey);
677
if(ret != GNUTLS_E_SUCCESS){
678
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
" structure: %s",
680
safer_gnutls_strerror(ret));
681
free(buffer.data);
682
buffer.data = NULL;
683
} else {
684
ret = gnutls_openpgp_privkey_import
685
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
686
if(ret != GNUTLS_E_SUCCESS){
687
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
688
safer_gnutls_strerror(ret));
689
privkey = NULL;
690
}
691
free(buffer.data);
692
buffer.data = NULL;
693
if(privkey != NULL){
694
/* Use private key to suggest an appropriate
695
sec_param */
696
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
697
gnutls_openpgp_privkey_deinit(privkey);
698
if(debug){
699
fprintf_plus(stderr, "This OpenPGP key implies using"
700
" a GnuTLS security parameter \"%s\".\n",
701
safe_string(gnutls_sec_param_get_name
702
(sec_param)));
703
}
704
}
705
}
706
}
707
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
708
/* Err on the side of caution */
709
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
if(debug){
711
fprintf_plus(stderr, "Falling back to security parameter"
712
" \"%s\"\n",
713
safe_string(gnutls_sec_param_get_name
714
(sec_param)));
715
}
716
}
717
}
718
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
719
if(uret != 0){
720
mc->dh_bits = uret;
721
if(debug){
722
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
723
" implies %u DH bits; using that.\n",
724
safe_string(gnutls_sec_param_get_name
725
(sec_param)),
726
mc->dh_bits);
727
}
728
} else {
729
fprintf_plus(stderr, "Failed to get implied number of DH"
730
" bits for security parameter \"%s\"): %s\n",
731
safe_string(gnutls_sec_param_get_name
732
(sec_param)),
733
safer_gnutls_strerror(ret));
734
goto globalfail;
735
}
736
} else if(debug){
737
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
738
mc->dh_bits);
739
}
740
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
743
" bits): %s\n", mc->dh_bits,
744
safer_gnutls_strerror(ret));
745
goto globalfail;
746
}
747
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
576
goto globalfail;
577
}
578
748
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
749
580
750
581
return 0;
752
583
globalfail:
753
584
754
585
gnutls_certificate_free_credentials(mc->cred);
586
gnutls_global_deinit();
755
587
gnutls_dh_params_deinit(mc->dh_params);
756
588
return -1;
757
589
}
809
641
/* ignore client certificate if any. */
810
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
811
643
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
812
646
return 0;
813
647
}
814
648
816
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
817
651
__attribute__((unused)) const char *txt){}
818
652
819
/* Set effective uid to 0, return errno */
820
__attribute__((warn_unused_result))
821
int raise_privileges(void){
822
int old_errno = errno;
823
int ret = 0;
824
if(seteuid(0) == -1){
825
ret = errno;
826
}
827
errno = old_errno;
828
return ret;
829
}
830
831
/* Set effective and real user ID to 0. Return errno. */
832
__attribute__((warn_unused_result))
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
836
if(ret != 0){
837
errno = old_errno;
838
return ret;
839
}
840
if(setuid(0) == -1){
841
ret = errno;
842
}
843
errno = old_errno;
844
return ret;
845
}
846
847
/* Set effective user ID to unprivileged saved user ID */
848
__attribute__((warn_unused_result))
849
int lower_privileges(void){
850
int old_errno = errno;
851
int ret = 0;
852
if(seteuid(uid) == -1){
853
ret = errno;
854
}
855
errno = old_errno;
856
return ret;
857
}
858
859
/* Lower privileges permanently */
860
__attribute__((warn_unused_result))
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
863
int ret = 0;
864
if(setuid(uid) == -1){
865
ret = errno;
866
}
867
errno = old_errno;
868
return ret;
869
}
870
871
/* Helper function to add_local_route() and delete_local_route() */
872
__attribute__((nonnull, warn_unused_result))
873
static bool add_delete_local_route(const bool add,
874
const char *address,
875
AvahiIfIndex if_index){
876
int ret;
877
char helper[] = "mandos-client-iprouteadddel";
878
char add_arg[] = "add";
879
char delete_arg[] = "delete";
880
char debug_flag[] = "--debug";
881
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
882
if(pluginhelperdir == NULL){
883
if(debug){
884
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
885
" variable not set; cannot run helper\n");
886
}
887
return false;
888
}
889
890
char interface[IF_NAMESIZE];
891
if(if_indextoname((unsigned int)if_index, interface) == NULL){
892
perror_plus("if_indextoname");
893
return false;
894
}
895
896
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
if(devnull == -1){
898
perror_plus("open(\"/dev/null\", O_RDONLY)");
899
return false;
900
}
901
pid_t pid = fork();
902
if(pid == 0){
903
/* Child */
904
/* Raise privileges */
905
errno = raise_privileges_permanently();
906
if(errno != 0){
907
perror_plus("Failed to raise privileges");
908
/* _exit(EX_NOPERM); */
909
} else {
910
/* Set group */
911
errno = 0;
912
ret = setgid(0);
913
if(ret == -1){
914
perror_plus("setgid");
915
_exit(EX_NOPERM);
916
}
917
/* Reset supplementary groups */
918
errno = 0;
919
ret = setgroups(0, NULL);
920
if(ret == -1){
921
perror_plus("setgroups");
922
_exit(EX_NOPERM);
923
}
924
}
925
ret = dup2(devnull, STDIN_FILENO);
926
if(ret == -1){
927
perror_plus("dup2(devnull, STDIN_FILENO)");
928
_exit(EX_OSERR);
929
}
930
ret = close(devnull);
931
if(ret == -1){
932
perror_plus("close");
933
_exit(EX_OSERR);
934
}
935
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
if(ret == -1){
937
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
938
_exit(EX_OSERR);
939
}
940
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
941
O_RDONLY
942
| O_DIRECTORY
943
| O_PATH
944
| O_CLOEXEC));
945
if(helperdir_fd == -1){
946
perror_plus("open");
947
_exit(EX_UNAVAILABLE);
948
}
949
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
950
helper, O_RDONLY));
951
if(helper_fd == -1){
952
perror_plus("openat");
953
close(helperdir_fd);
954
_exit(EX_UNAVAILABLE);
955
}
956
close(helperdir_fd);
957
#ifdef __GNUC__
958
#pragma GCC diagnostic push
959
#pragma GCC diagnostic ignored "-Wcast-qual"
960
#endif
961
if(fexecve(helper_fd, (char *const [])
962
{ helper, add ? add_arg : delete_arg, (char *)address,
963
interface, debug ? debug_flag : NULL, NULL },
964
environ) == -1){
965
#ifdef __GNUC__
966
#pragma GCC diagnostic pop
967
#endif
968
perror_plus("fexecve");
969
_exit(EXIT_FAILURE);
970
}
971
}
972
if(pid == -1){
973
perror_plus("fork");
974
return false;
975
}
976
int status;
977
pid_t pret = -1;
978
errno = 0;
979
do {
980
pret = waitpid(pid, &status, 0);
981
if(pret == -1 and errno == EINTR and quit_now){
982
int errno_raising = 0;
983
if((errno = raise_privileges()) != 0){
984
errno_raising = errno;
985
perror_plus("Failed to raise privileges in order to"
986
" kill helper program");
987
}
988
if(kill(pid, SIGTERM) == -1){
989
perror_plus("kill");
990
}
991
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
992
perror_plus("Failed to lower privileges after killing"
993
" helper program");
994
}
995
return false;
996
}
997
} while(pret == -1 and errno == EINTR);
998
if(pret == -1){
999
perror_plus("waitpid");
1000
return false;
1001
}
1002
if(WIFEXITED(status)){
1003
if(WEXITSTATUS(status) != 0){
1004
fprintf_plus(stderr, "Error: iprouteadddel exited"
1005
" with status %d\n", WEXITSTATUS(status));
1006
return false;
1007
}
1008
return true;
1009
}
1010
if(WIFSIGNALED(status)){
1011
fprintf_plus(stderr, "Error: iprouteadddel died by"
1012
" signal %d\n", WTERMSIG(status));
1013
return false;
1014
}
1015
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1016
return false;
1017
}
1018
1019
__attribute__((nonnull, warn_unused_result))
1020
static bool add_local_route(const char *address,
1021
AvahiIfIndex if_index){
1022
if(debug){
1023
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
}
1025
return add_delete_local_route(true, address, if_index);
1026
}
1027
1028
__attribute__((nonnull, warn_unused_result))
1029
static bool delete_local_route(const char *address,
1030
AvahiIfIndex if_index){
1031
if(debug){
1032
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
}
1034
return add_delete_local_route(false, address, if_index);
1035
}
1036
1037
653
/* Called when a Mandos server is found */
1038
654
__attribute__((nonnull, warn_unused_result))
1039
655
static int start_mandos_communication(const char *ip, in_port_t port,
1050
666
int retval = -1;
1051
667
gnutls_session_t session;
1052
668
int pf; /* Protocol family */
1053
bool route_added = false;
1054
669
1055
670
errno = 0;
1056
671
1114
729
PRIuMAX "\n", ip, (uintmax_t)port);
1115
730
}
1116
731
1117
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
1118
733
if(tcp_sd < 0){
1119
734
int e = errno;
1120
735
perror_plus("socket");
1127
742
goto mandos_end;
1128
743
}
1129
744
745
memset(&to, 0, sizeof(to));
1130
746
if(af == AF_INET6){
1131
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1132
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1133
ret = inet_pton(af, ip, &to6->sin6_addr);
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1134
749
} else { /* IPv4 */
1135
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1136
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to4->sin_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1138
752
}
1139
753
if(ret < 0 ){
1140
754
int e = errno;
1210
824
goto mandos_end;
1211
825
}
1212
826
1213
while(true){
1214
if(af == AF_INET6){
1215
ret = connect(tcp_sd, (struct sockaddr *)&to,
1216
sizeof(struct sockaddr_in6));
1217
} else {
1218
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1219
sizeof(struct sockaddr_in));
1220
}
1221
if(ret < 0){
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1223
and if_index != AVAHI_IF_UNSPEC
1224
and connect_to == NULL
1225
and not route_added and
1226
((af == AF_INET6 and not
1227
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
&to)->sin6_addr)))
1229
or (af == AF_INET and
1230
/* Not a a IPv4LL address */
1231
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1232
& 0xFFFF0000L) != 0xA9FE0000L))){
1233
/* Work around Avahi bug - Avahi does not announce link-local
1234
addresses if it has a global address, so local hosts with
1235
*only* a link-local address (e.g. Mandos clients) cannot
1236
connect to a Mandos server announced by Avahi on a server
1237
host with a global address. Work around this by retrying
1238
with an explicit route added with the server's address.
1239
1240
Avahi bug reference:
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://bugs.debian.org/587961
1243
*/
1244
if(debug){
1245
fprintf_plus(stderr, "Mandos server unreachable, trying"
1246
" direct route\n");
1247
}
1248
int e = errno;
1249
route_added = add_local_route(ip, if_index);
1250
if(route_added){
1251
continue;
1252
}
1253
errno = e;
1254
}
1255
if(errno != ECONNREFUSED or debug){
1256
int e = errno;
1257
perror_plus("connect");
1258
errno = e;
1259
}
1260
goto mandos_end;
1261
}
1262
1263
if(quit_now){
1264
errno = EINTR;
1265
goto mandos_end;
1266
}
1267
break;
827
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
830
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
833
}
834
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
int e = errno;
837
perror_plus("connect");
838
errno = e;
839
}
840
goto mandos_end;
841
}
842
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
1268
846
}
1269
847
1270
848
const char *out = mandos_protocol_version;
1424
1002
&decrypted_buffer, mc);
1425
1003
if(decrypted_buffer_size >= 0){
1426
1004
1427
clearerr(stdout);
1428
1005
written = 0;
1429
1006
while(written < (size_t) decrypted_buffer_size){
1430
1007
if(quit_now){
1446
1023
}
1447
1024
written += (size_t)ret;
1448
1025
}
1449
ret = fflush(stdout);
1450
if(ret != 0){
1451
int e = errno;
1452
if(debug){
1453
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1454
strerror(errno));
1455
}
1456
errno = e;
1457
goto mandos_end;
1458
}
1459
1026
retval = 0;
1460
1027
}
1461
1028
}
1464
1031
1465
1032
mandos_end:
1466
1033
{
1467
if(route_added){
1468
if(not delete_local_route(ip, if_index)){
1469
fprintf_plus(stderr, "Failed to delete local route to %s on"
1470
" interface %d", ip, if_index);
1471
}
1472
}
1473
1034
int e = errno;
1474
1035
free(decrypted_buffer);
1475
1036
free(buffer);
1476
1037
if(tcp_sd >= 0){
1477
ret = close(tcp_sd);
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1478
1039
}
1479
1040
if(ret == -1){
1480
1041
if(e == 0){
1635
1196
__attribute__((nonnull, warn_unused_result))
1636
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1637
1198
int ret;
1638
int old_errno;
1199
error_t ret_errno;
1639
1200
1640
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1641
1202
if(s < 0){
1642
old_errno = errno;
1203
ret_errno = errno;
1643
1204
perror_plus("socket");
1644
errno = old_errno;
1205
errno = ret_errno;
1645
1206
return false;
1646
1207
}
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1208
strcpy(ifr->ifr_name, ifname);
1649
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1650
1210
if(ret == -1){
1651
1211
if(debug){
1652
old_errno = errno;
1212
ret_errno = errno;
1653
1213
perror_plus("ioctl SIOCGIFFLAGS");
1654
errno = old_errno;
1214
errno = ret_errno;
1655
1215
}
1656
1216
return false;
1657
1217
}
1902
1462
}
1903
1463
}
1904
1464
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1905
1517
__attribute__((nonnull))
1906
1518
void run_network_hooks(const char *mode, const char *interface,
1907
1519
const float delay){
1908
1520
struct dirent **direntries = NULL;
1909
1521
if(hookdir_fd == -1){
1910
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
| O_CLOEXEC);
1522
hookdir_fd = open(hookdir, O_RDONLY);
1912
1523
if(hookdir_fd == -1){
1913
1524
if(errno == ENOENT){
1914
1525
if(debug){
1921
1532
return;
1922
1533
}
1923
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1924
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1925
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1926
1547
if(numhooks == -1){
1927
1548
perror_plus("scandir");
1928
1549
return;
1929
1550
}
1930
1551
struct dirent *direntry;
1931
1552
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
}
1553
int devnull = open("/dev/null", O_RDONLY);
1937
1554
for(int i = 0; i < numhooks; i++){
1938
1555
direntry = direntries[i];
1939
1556
if(debug){
1963
1580
perror_plus("setgroups");
1964
1581
_exit(EX_NOPERM);
1965
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1966
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
1599
if(ret == -1){
1968
1600
perror_plus("setenv");
2003
1635
_exit(EX_OSERR);
2004
1636
}
2005
1637
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2009
1639
if(hook_fd == -1){
2010
1640
perror_plus("openat");
2011
1641
_exit(EXIT_FAILURE);
2012
1642
}
2013
if(close(hookdir_fd) == -1){
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
1644
perror_plus("close");
2015
1645
_exit(EXIT_FAILURE);
2016
1646
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = 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
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
1648
environ) == -1){
2034
1649
perror_plus("fexecve");
2074
1689
free(direntry);
2075
1690
}
2076
1691
free(direntries);
2077
if(close(hookdir_fd) == -1){
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
1693
perror_plus("close");
2079
1694
} else {
2080
1695
hookdir_fd = -1;
2083
1698
}
2084
1699
2085
1700
__attribute__((nonnull, warn_unused_result))
2086
int bring_up_interface(const char *const interface,
2087
const float delay){
2088
int old_errno = errno;
1701
error_t bring_up_interface(const char *const interface,
1702
const float delay){
1703
error_t old_errno = errno;
2089
1704
int ret;
2090
1705
struct ifreq network;
2091
1706
unsigned int if_index = if_nametoindex(interface);
2101
1716
}
2102
1717
2103
1718
if(not interface_is_up(interface)){
2104
int ret_errno = 0;
2105
int ioctl_errno = 0;
1719
error_t ret_errno = 0, ioctl_errno = 0;
2106
1720
if(not get_flags(interface, &network)){
2107
1721
ret_errno = errno;
2108
1722
fprintf_plus(stderr, "Failed to get flags for interface "
2121
1735
}
2122
1736
2123
1737
if(quit_now){
2124
ret = close(sd);
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2125
1739
if(ret == -1){
2126
1740
perror_plus("close");
2127
1741
}
2177
1791
}
2178
1792
2179
1793
/* Close the socket */
2180
ret = close(sd);
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2181
1795
if(ret == -1){
2182
1796
perror_plus("close");
2183
1797
}
2211
1825
}
2212
1826
2213
1827
__attribute__((nonnull, warn_unused_result))
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
1828
error_t take_down_interface(const char *const interface){
1829
error_t old_errno = errno;
2216
1830
struct ifreq network;
2217
1831
unsigned int if_index = if_nametoindex(interface);
2218
1832
if(if_index == 0){
2221
1835
return ENXIO;
2222
1836
}
2223
1837
if(interface_is_up(interface)){
2224
int ret_errno = 0;
2225
int ioctl_errno = 0;
1838
error_t ret_errno = 0, ioctl_errno = 0;
2226
1839
if(not get_flags(interface, &network) and debug){
2227
1840
ret_errno = errno;
2228
1841
fprintf_plus(stderr, "Failed to get flags for interface "
2266
1879
}
2267
1880
2268
1881
/* Close the socket */
2269
int ret = close(sd);
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
1883
if(ret == -1){
2271
1884
perror_plus("close");
2272
1885
}
2287
1900
}
2288
1901
2289
1902
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
1903
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1904
.priority = "SECURE256:!CTYPE-X.509:"
1905
"+CTYPE-OPENPGP", .current_server = NULL,
1906
.interfaces = NULL, .interfaces_size = 0 };
2295
1907
AvahiSServiceBrowser *sb = NULL;
2296
1908
error_t ret_errno;
2297
1909
int ret;
2306
1918
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
1919
const char *seckey = PATHDIR "/" SECKEY;
2308
1920
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
1921
char *interfaces_hooks = NULL;
2311
1922
2312
1923
bool gnutls_initialized = false;
2365
1976
.doc = "Bit length of the prime number used in the"
2366
1977
" Diffie-Hellman key exchange",
2367
1978
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
2373
1979
{ .name = "priority", .key = 130,
2374
1980
.arg = "STRING",
2375
1981
.doc = "GnuTLS priority string for the TLS handshake",
2430
2036
}
2431
2037
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
2038
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
2436
2039
case 130: /* --priority */
2437
2040
mc.priority = arg;
2438
2041
break;
2478
2081
.args_doc = "",
2479
2082
.doc = "Mandos client -- Get and decrypt"
2480
2083
" passwords from a Mandos server" };
2481
ret_errno = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret_errno){
2084
ret = argp_parse(&argp, argc, argv,
2085
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2086
switch(ret){
2484
2087
case 0:
2485
2088
break;
2486
2089
case ENOMEM:
2487
2090
default:
2488
errno = ret_errno;
2091
errno = ret;
2489
2092
perror_plus("argp_parse");
2490
2093
exitcode = EX_OSERR;
2491
2094
goto end;
2494
2097
goto end;
2495
2098
}
2496
2099
}
2497
2100
2498
2101
{
2499
2102
/* Work around Debian bug #633582:
2500
<https://bugs.debian.org/633582> */
2103
<http://bugs.debian.org/633582> */
2501
2104
2502
2105
/* Re-raise privileges */
2503
ret = raise_privileges();
2504
if(ret != 0){
2505
errno = ret;
2106
ret_errno = raise_privileges();
2107
if(ret_errno != 0){
2108
errno = ret_errno;
2506
2109
perror_plus("Failed to raise privileges");
2507
2110
} else {
2508
2111
struct stat st;
2524
2127
}
2525
2128
}
2526
2129
}
2527
close(seckey_fd);
2130
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
2131
}
2529
2132
}
2530
2133
2531
2134
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
2135
int pubkey_fd = open(pubkey, O_RDONLY);
2533
2136
if(pubkey_fd == -1){
2545
2148
}
2546
2149
}
2547
2150
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2151
TEMP_FAILURE_RETRY(close(pubkey_fd));
2152
}
2153
}
2154
2574
2155
/* Lower privileges */
2575
ret = lower_privileges();
2576
if(ret != 0){
2577
errno = ret;
2156
ret_errno = lower_privileges();
2157
if(ret_errno != 0){
2158
errno = ret_errno;
2578
2159
perror_plus("Failed to lower privileges");
2579
2160
}
2580
2161
}
2750
2331
errno = bring_up_interface(interface, delay);
2751
2332
if(not interface_was_up){
2752
2333
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2334
perror_plus("Failed to bring up interface");
2755
2335
} else {
2756
2336
errno = argz_add(&interfaces_to_take_down,
2757
2337
&interfaces_to_take_down_size,
2780
2360
goto end;
2781
2361
}
2782
2362
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2363
ret = init_gnutls_global(pubkey, seckey, &mc);
2784
2364
if(ret == -1){
2785
2365
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
2366
exitcode = EX_UNAVAILABLE;
2908
2488
2909
2489
/* Allocate a new server */
2910
2490
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret);
2491
&config, NULL, NULL, &ret_errno);
2912
2492
2913
2493
/* Free the Avahi configuration data */
2914
2494
avahi_server_config_free(&config);
2917
2497
/* Check if creating the Avahi server object succeeded */
2918
2498
if(mc.server == NULL){
2919
2499
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret));
2500
avahi_strerror(ret_errno));
2921
2501
exitcode = EX_UNAVAILABLE;
2922
2502
goto end;
2923
2503
}
2958
2538
end:
2959
2539
2960
2540
if(debug){
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2965
} else {
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
}
2541
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
2542
}
2969
2543
2970
2544
/* Cleanup things */
2981
2555
2982
2556
if(gnutls_initialized){
2983
2557
gnutls_certificate_free_credentials(mc.cred);
2558
gnutls_global_deinit();
2984
2559
gnutls_dh_params_deinit(mc.dh_params);
2985
2560
}
2986
2561
3009
2584
3010
2585
/* Re-raise privileges */
3011
2586
{
3012
ret = raise_privileges();
3013
if(ret != 0){
3014
errno = ret;
2587
ret_errno = raise_privileges();
2588
if(ret_errno != 0){
2589
errno = ret_errno;
3015
2590
perror_plus("Failed to raise privileges");
3016
2591
} else {
3017
2592
3025
2600
while((interface=argz_next(interfaces_to_take_down,
3026
2601
interfaces_to_take_down_size,
3027
2602
interface))){
3028
ret = take_down_interface(interface);
3029
if(ret != 0){
3030
errno = ret;
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
3031
2606
perror_plus("Failed to take down interface");
3032
2607
}
3033
2608
}
3038
2613
}
3039
2614
}
3040
2615
3041
ret = lower_privileges_permanently();
3042
if(ret != 0){
3043
errno = ret;
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
errno = ret_errno;
3044
2619
perror_plus("Failed to lower privileges permanently");
3045
2620
}
3046
2621
}
3048
2623
free(interfaces_to_take_down);
3049
2624
free(interfaces_hooks);
3050
2625
3051
void clean_dir_at(int base, const char * const dirname,
3052
uintmax_t level){
3053
struct dirent **direntries = NULL;
3054
int dret;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3056
O_RDONLY
3057
| O_NOFOLLOW
3058
| O_DIRECTORY
3059
| O_PATH));
3060
if(dir_fd == -1){
3061
perror_plus("open");
3062
}
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
if(debug){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3070
}
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3072
if(dret == -1){
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3075
AT_REMOVEDIR);
3076
}
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3082
dret = 0;
3083
}
3084
if(dret == -1){
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3087
}
3088
}
3089
free(direntries[i]);
3090
}
3091
3092
/* need to clean even if 0 because man page doesn't specify */
3093
free(direntries);
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3096
}
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3100
}
3101
} else {
3102
perror_plus("scandirat");
3103
}
3104
close(dir_fd);
3105
}
3106
3107
2626
/* Removes the GPGME temp directory and all files inside */
3108
2627
if(tempdir != NULL){
3109
clean_dir_at(-1, tempdir, 0);
2628
struct dirent **direntries = NULL;
2629
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2630
O_NOFOLLOW));
2631
if(tempdir_fd == -1){
2632
perror_plus("open");
2633
} else {
2634
#ifdef __GLIBC__
2635
#if __GLIBC_PREREQ(2, 15)
2636
int numentries = scandirat(tempdir_fd, ".", &direntries,
2637
notdotentries, alphasort);
2638
#else /* not __GLIBC_PREREQ(2, 15) */
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
alphasort);
2641
#endif /* not __GLIBC_PREREQ(2, 15) */
2642
#else /* not __GLIBC__ */
2643
int numentries = scandir(tempdir, &direntries, notdotentries,
2644
alphasort);
2645
#endif /* not __GLIBC__ */
2646
if(numentries >= 0){
2647
for(int i = 0; i < numentries; i++){
2648
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2649
if(ret == -1){
2650
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2651
" \"%s\", 0): %s\n", tempdir,
2652
direntries[i]->d_name, strerror(errno));
2653
}
2654
free(direntries[i]);
2655
}
2656
2657
/* need to clean even if 0 because man page doesn't specify */
2658
free(direntries);
2659
if(numentries == -1){
2660
perror_plus("scandir");
2661
}
2662
ret = rmdir(tempdir);
2663
if(ret == -1 and errno != ENOENT){
2664
perror_plus("rmdir");
2665
}
2666
}
2667
TEMP_FAILURE_RETRY(close(tempdir_fd));
2668
}
3110
2669
}
3111
2670
3112
2671
if(quit_now){
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Version: 2.0.2.dev0