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- Committer: Teddy Hogeborn
- Date: 2014-10-05 19:39:25 UTC
- Revision ID: teddy@recompile.se-20141005193925-jjqx2n2dt3icy28u
* mandos.service ([Unit]/Documentation): New.
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
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
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
749
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
750
580
751
581
return 0;
753
583
globalfail:
754
584
755
585
gnutls_certificate_free_credentials(mc->cred);
586
gnutls_global_deinit();
756
587
gnutls_dh_params_deinit(mc->dh_params);
757
588
return -1;
758
589
}
810
641
/* ignore client certificate if any. */
811
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
643
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
813
646
return 0;
814
647
}
815
648
817
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
651
__attribute__((unused)) const char *txt){}
819
652
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
1038
653
/* Called when a Mandos server is found */
1039
654
__attribute__((nonnull, warn_unused_result))
1040
655
static int start_mandos_communication(const char *ip, in_port_t port,
1051
666
int retval = -1;
1052
667
gnutls_session_t session;
1053
668
int pf; /* Protocol family */
1054
bool route_added = false;
1055
669
1056
670
errno = 0;
1057
671
1115
729
PRIuMAX "\n", ip, (uintmax_t)port);
1116
730
}
1117
731
1118
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
733
if(tcp_sd < 0){
1120
734
int e = errno;
1121
735
perror_plus("socket");
1128
742
goto mandos_end;
1129
743
}
1130
744
745
memset(&to, 0, sizeof(to));
1131
746
if(af == AF_INET6){
1132
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1133
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1134
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);
1135
749
} else { /* IPv4 */
1136
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1137
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1138
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);
1139
752
}
1140
753
if(ret < 0 ){
1141
754
int e = errno;
1211
824
goto mandos_end;
1212
825
}
1213
826
1214
while(true){
1215
if(af == AF_INET6){
1216
ret = connect(tcp_sd, (struct sockaddr *)&to,
1217
sizeof(struct sockaddr_in6));
1218
} else {
1219
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1220
sizeof(struct sockaddr_in));
1221
}
1222
if(ret < 0){
1223
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1224
and if_index != AVAHI_IF_UNSPEC
1225
and connect_to == NULL
1226
and not route_added and
1227
((af == AF_INET6 and not
1228
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1229
&to)->sin6_addr)))
1230
or (af == AF_INET and
1231
/* Not a a IPv4LL address */
1232
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1233
& 0xFFFF0000L) != 0xA9FE0000L))){
1234
/* Work around Avahi bug - Avahi does not announce link-local
1235
addresses if it has a global address, so local hosts with
1236
*only* a link-local address (e.g. Mandos clients) cannot
1237
connect to a Mandos server announced by Avahi on a server
1238
host with a global address. Work around this by retrying
1239
with an explicit route added with the server's address.
1240
1241
Avahi bug reference:
1242
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1243
https://bugs.debian.org/587961
1244
*/
1245
if(debug){
1246
fprintf_plus(stderr, "Mandos server unreachable, trying"
1247
" direct route\n");
1248
}
1249
int e = errno;
1250
route_added = add_local_route(ip, if_index);
1251
if(route_added){
1252
continue;
1253
}
1254
errno = e;
1255
}
1256
if(errno != ECONNREFUSED or debug){
1257
int e = errno;
1258
perror_plus("connect");
1259
errno = e;
1260
}
1261
goto mandos_end;
1262
}
1263
1264
if(quit_now){
1265
errno = EINTR;
1266
goto mandos_end;
1267
}
1268
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;
1269
846
}
1270
847
1271
848
const char *out = mandos_protocol_version;
1425
1002
&decrypted_buffer, mc);
1426
1003
if(decrypted_buffer_size >= 0){
1427
1004
1428
clearerr(stdout);
1429
1005
written = 0;
1430
1006
while(written < (size_t) decrypted_buffer_size){
1431
1007
if(quit_now){
1447
1023
}
1448
1024
written += (size_t)ret;
1449
1025
}
1450
ret = fflush(stdout);
1451
if(ret != 0){
1452
int e = errno;
1453
if(debug){
1454
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1455
strerror(errno));
1456
}
1457
errno = e;
1458
goto mandos_end;
1459
}
1460
1026
retval = 0;
1461
1027
}
1462
1028
}
1465
1031
1466
1032
mandos_end:
1467
1033
{
1468
if(route_added){
1469
if(not delete_local_route(ip, if_index)){
1470
fprintf_plus(stderr, "Failed to delete local route to %s on"
1471
" interface %d", ip, if_index);
1472
}
1473
}
1474
1034
int e = errno;
1475
1035
free(decrypted_buffer);
1476
1036
free(buffer);
1477
1037
if(tcp_sd >= 0){
1478
ret = close(tcp_sd);
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
1039
}
1480
1040
if(ret == -1){
1481
1041
if(e == 0){
1636
1196
__attribute__((nonnull, warn_unused_result))
1637
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1638
1198
int ret;
1639
int old_errno;
1199
error_t ret_errno;
1640
1200
1641
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
1202
if(s < 0){
1643
old_errno = errno;
1203
ret_errno = errno;
1644
1204
perror_plus("socket");
1645
errno = old_errno;
1205
errno = ret_errno;
1646
1206
return false;
1647
1207
}
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1208
strcpy(ifr->ifr_name, ifname);
1650
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1651
1210
if(ret == -1){
1652
1211
if(debug){
1653
old_errno = errno;
1212
ret_errno = errno;
1654
1213
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1214
errno = ret_errno;
1656
1215
}
1657
1216
return false;
1658
1217
}
1903
1462
}
1904
1463
}
1905
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
1906
1517
__attribute__((nonnull))
1907
1518
void run_network_hooks(const char *mode, const char *interface,
1908
1519
const float delay){
1909
1520
struct dirent **direntries = NULL;
1910
1521
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
| O_CLOEXEC);
1522
hookdir_fd = open(hookdir, O_RDONLY);
1913
1523
if(hookdir_fd == -1){
1914
1524
if(errno == ENOENT){
1915
1525
if(debug){
1922
1532
return;
1923
1533
}
1924
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1925
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
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__ */
1927
1547
if(numhooks == -1){
1928
1548
perror_plus("scandir");
1929
1549
return;
1930
1550
}
1931
1551
struct dirent *direntry;
1932
1552
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1553
int devnull = open("/dev/null", O_RDONLY);
1938
1554
for(int i = 0; i < numhooks; i++){
1939
1555
direntry = direntries[i];
1940
1556
if(debug){
1964
1580
perror_plus("setgroups");
1965
1581
_exit(EX_NOPERM);
1966
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
}
1967
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
1599
if(ret == -1){
1969
1600
perror_plus("setenv");
2004
1635
_exit(EX_OSERR);
2005
1636
}
2006
1637
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2010
1639
if(hook_fd == -1){
2011
1640
perror_plus("openat");
2012
1641
_exit(EXIT_FAILURE);
2013
1642
}
2014
if(close(hookdir_fd) == -1){
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
1644
perror_plus("close");
2016
1645
_exit(EXIT_FAILURE);
2017
1646
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
1648
environ) == -1){
2035
1649
perror_plus("fexecve");
2075
1689
free(direntry);
2076
1690
}
2077
1691
free(direntries);
2078
if(close(hookdir_fd) == -1){
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2079
1693
perror_plus("close");
2080
1694
} else {
2081
1695
hookdir_fd = -1;
2084
1698
}
2085
1699
2086
1700
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
1701
error_t bring_up_interface(const char *const interface,
1702
const float delay){
1703
error_t old_errno = errno;
2090
1704
int ret;
2091
1705
struct ifreq network;
2092
1706
unsigned int if_index = if_nametoindex(interface);
2102
1716
}
2103
1717
2104
1718
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
1719
error_t ret_errno = 0, ioctl_errno = 0;
2107
1720
if(not get_flags(interface, &network)){
2108
1721
ret_errno = errno;
2109
1722
fprintf_plus(stderr, "Failed to get flags for interface "
2122
1735
}
2123
1736
2124
1737
if(quit_now){
2125
ret = close(sd);
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2126
1739
if(ret == -1){
2127
1740
perror_plus("close");
2128
1741
}
2178
1791
}
2179
1792
2180
1793
/* Close the socket */
2181
ret = close(sd);
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
1795
if(ret == -1){
2183
1796
perror_plus("close");
2184
1797
}
2212
1825
}
2213
1826
2214
1827
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
1828
error_t take_down_interface(const char *const interface){
1829
error_t old_errno = errno;
2217
1830
struct ifreq network;
2218
1831
unsigned int if_index = if_nametoindex(interface);
2219
1832
if(if_index == 0){
2222
1835
return ENXIO;
2223
1836
}
2224
1837
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
1838
error_t ret_errno = 0, ioctl_errno = 0;
2227
1839
if(not get_flags(interface, &network) and debug){
2228
1840
ret_errno = errno;
2229
1841
fprintf_plus(stderr, "Failed to get flags for interface "
2267
1879
}
2268
1880
2269
1881
/* Close the socket */
2270
int ret = close(sd);
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
1883
if(ret == -1){
2272
1884
perror_plus("close");
2273
1885
}
2288
1900
}
2289
1901
2290
1902
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 };
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 };
2296
1907
AvahiSServiceBrowser *sb = NULL;
2297
1908
error_t ret_errno;
2298
1909
int ret;
2307
1918
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1919
const char *seckey = PATHDIR "/" SECKEY;
2309
1920
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
1921
char *interfaces_hooks = NULL;
2312
1922
2313
1923
bool gnutls_initialized = false;
2366
1976
.doc = "Bit length of the prime number used in the"
2367
1977
" Diffie-Hellman key exchange",
2368
1978
.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
1979
{ .name = "priority", .key = 130,
2375
1980
.arg = "STRING",
2376
1981
.doc = "GnuTLS priority string for the TLS handshake",
2431
2036
}
2432
2037
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
2038
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
2039
case 130: /* --priority */
2438
2040
mc.priority = arg;
2439
2041
break;
2479
2081
.args_doc = "",
2480
2082
.doc = "Mandos client -- Get and decrypt"
2481
2083
" passwords from a Mandos server" };
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
2084
ret = argp_parse(&argp, argc, argv,
2085
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2086
switch(ret){
2485
2087
case 0:
2486
2088
break;
2487
2089
case ENOMEM:
2488
2090
default:
2489
errno = ret_errno;
2091
errno = ret;
2490
2092
perror_plus("argp_parse");
2491
2093
exitcode = EX_OSERR;
2492
2094
goto end;
2495
2097
goto end;
2496
2098
}
2497
2099
}
2498
2100
2499
2101
{
2500
2102
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
2103
<http://bugs.debian.org/633582> */
2502
2104
2503
2105
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2106
ret_errno = raise_privileges();
2107
if(ret_errno != 0){
2108
errno = ret_errno;
2507
2109
perror_plus("Failed to raise privileges");
2508
2110
} else {
2509
2111
struct stat st;
2525
2127
}
2526
2128
}
2527
2129
}
2528
close(seckey_fd);
2130
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
2131
}
2530
2132
}
2531
2133
2532
2134
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
2135
int pubkey_fd = open(pubkey, O_RDONLY);
2534
2136
if(pubkey_fd == -1){
2546
2148
}
2547
2149
}
2548
2150
}
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
2151
TEMP_FAILURE_RETRY(close(pubkey_fd));
2152
}
2153
}
2154
2575
2155
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2156
ret_errno = lower_privileges();
2157
if(ret_errno != 0){
2158
errno = ret_errno;
2579
2159
perror_plus("Failed to lower privileges");
2580
2160
}
2581
2161
}
2751
2331
errno = bring_up_interface(interface, delay);
2752
2332
if(not interface_was_up){
2753
2333
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2334
perror_plus("Failed to bring up interface");
2756
2335
} else {
2757
2336
errno = argz_add(&interfaces_to_take_down,
2758
2337
&interfaces_to_take_down_size,
2781
2360
goto end;
2782
2361
}
2783
2362
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2363
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
2364
if(ret == -1){
2786
2365
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2366
exitcode = EX_UNAVAILABLE;
2909
2488
2910
2489
/* Allocate a new server */
2911
2490
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
2491
&config, NULL, NULL, &ret_errno);
2913
2492
2914
2493
/* Free the Avahi configuration data */
2915
2494
avahi_server_config_free(&config);
2918
2497
/* Check if creating the Avahi server object succeeded */
2919
2498
if(mc.server == NULL){
2920
2499
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
2500
avahi_strerror(ret_errno));
2922
2501
exitcode = EX_UNAVAILABLE;
2923
2502
goto end;
2924
2503
}
2959
2538
end:
2960
2539
2961
2540
if(debug){
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
2541
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
2542
}
2970
2543
2971
2544
/* Cleanup things */
2982
2555
2983
2556
if(gnutls_initialized){
2984
2557
gnutls_certificate_free_credentials(mc.cred);
2558
gnutls_global_deinit();
2985
2559
gnutls_dh_params_deinit(mc.dh_params);
2986
2560
}
2987
2561
3010
2584
3011
2585
/* Re-raise privileges */
3012
2586
{
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
2587
ret_errno = raise_privileges();
2588
if(ret_errno != 0){
2589
errno = ret_errno;
3016
2590
perror_plus("Failed to raise privileges");
3017
2591
} else {
3018
2592
3026
2600
while((interface=argz_next(interfaces_to_take_down,
3027
2601
interfaces_to_take_down_size,
3028
2602
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
3032
2606
perror_plus("Failed to take down interface");
3033
2607
}
3034
2608
}
3039
2613
}
3040
2614
}
3041
2615
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
errno = ret_errno;
3045
2619
perror_plus("Failed to lower privileges permanently");
3046
2620
}
3047
2621
}
3049
2623
free(interfaces_to_take_down);
3050
2624
free(interfaces_hooks);
3051
2625
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
3054
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
3108
2626
/* Removes the GPGME temp directory and all files inside */
3109
2627
if(tempdir != NULL){
3110
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
}
3111
2669
}
3112
2670
3113
2671
if(quit_now){
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Version: 2.0.2.dev0