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- Committer: Teddy Hogeborn
- Date: 2014-07-25 22:44:20 UTC
- mto: This revision was merged to the branch mainline in revision 724.
- Revision ID: teddy@recompile.se-20140725224420-4a5ct2ptt0hsc92z
Require Python 2.7.
This is in preparation for the eventual move to Python 3, which will
happen as soon as all Python modules required by Mandos are available.
The mandos-ctl and mandos-monitor programs are already portable
between Python 2.6 and Python 3 without changes; this change will
bring the requirement up to Python 2.7.
* INSTALL (Prerequisites/Libraries/Mandos Server): Document
requirement of
Python 2.7; remove
Python-argparse
which is in the
Python 2.7 standard
library.
* debian/control (Source: mandos/Build-Depends-Indep): Depend on
exactly the
python2.7
package and all
the Python 2.7
versions of the
python modules.
(Package: mandos/Depends): - '' - but still depend on python (<=2.7)
and the generic versions of the Python
modules; this is for mandos-ctl and
mandos-monitor, both of which are
compatible with Python 3, and use
#!/usr/bin/python.
* mandos: Use #!/usr/bin/python2.7 instead of #!/usr/bin/python.
This is in preparation for the eventual move to Python 3, which will
happen as soon as all Python modules required by Mandos are available.
The mandos-ctl and mandos-monitor programs are already portable
between Python 2.6 and Python 3 without changes; this change will
bring the requirement up to Python 2.7.
* INSTALL (Prerequisites/Libraries/Mandos Server): Document
requirement of
Python 2.7; remove
Python-argparse
which is in the
Python 2.7 standard
library.
* debian/control (Source: mandos/Build-Depends-Indep): Depend on
exactly the
python2.7
package and all
the Python 2.7
versions of the
python modules.
(Package: mandos/Depends): - '' - but still depend on python (<=2.7)
and the generic versions of the Python
modules; this is for mandos-ctl and
mandos-monitor, both of which are
compatible with Python 3, and use
#!/usr/bin/python.
* mandos: Use #!/usr/bin/python2.7 instead of #!/usr/bin/python.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
311
305
return false;
312
306
}
313
307
314
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
309
if(ret == -1){
316
310
perror_plus("close");
317
311
}
356
350
/* Create new GPGME "context" */
357
351
rc = gpgme_new(&(mc->ctx));
358
352
if(rc != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
361
356
return false;
362
357
}
363
358
399
394
/* Create new empty GPGME data buffer for the plaintext */
400
395
rc = gpgme_data_new(&dh_plain);
401
396
if(rc != GPG_ERR_NO_ERROR){
402
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
403
399
gpgme_strsource(rc), gpgme_strerror(rc));
404
400
gpgme_data_release(dh_crypto);
405
401
return -1;
418
414
if(result == NULL){
419
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
420
416
} else {
421
if(result->unsupported_algorithm != NULL) {
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
}
425
fprintf_plus(stderr, "Wrong key usage: %s\n",
426
result->wrong_key_usage ? "Yes" : "No");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
427
421
if(result->file_name != NULL){
428
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
429
423
}
499
493
return plaintext_length;
500
494
}
501
495
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
496
__attribute__((warn_unused_result))
510
497
static const char *safer_gnutls_strerror(int value){
511
498
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
499
if(ret == NULL)
500
ret = "(unknown)";
501
return ret;
513
502
}
514
503
515
504
/* GnuTLS log function callback */
519
508
fprintf_plus(stderr, "GnuTLS: %s", string);
520
509
}
521
510
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
511
__attribute__((nonnull, warn_unused_result))
523
512
static int init_gnutls_global(const char *pubkeyfilename,
524
513
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
514
mandos_context *mc){
527
515
int ret;
528
unsigned int uret;
529
516
530
517
if(debug){
531
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
519
}
533
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
534
528
if(debug){
535
529
/* "Use a log level over 10 to enable all debugging options."
536
530
* - GnuTLS manual
544
538
if(ret != GNUTLS_E_SUCCESS){
545
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
540
safer_gnutls_strerror(ret));
541
gnutls_global_deinit();
547
542
return -1;
548
543
}
549
544
574
569
safer_gnutls_strerror(ret));
575
570
goto globalfail;
576
571
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
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
754
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
755
580
756
581
return 0;
758
583
globalfail:
759
584
760
585
gnutls_certificate_free_credentials(mc->cred);
586
gnutls_global_deinit();
761
587
gnutls_dh_params_deinit(mc->dh_params);
762
588
return -1;
763
589
}
815
641
/* ignore client certificate if any. */
816
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
817
643
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
818
646
return 0;
819
647
}
820
648
822
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
823
651
__attribute__((unused)) const char *txt){}
824
652
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
1043
653
/* Called when a Mandos server is found */
1044
654
__attribute__((nonnull, warn_unused_result))
1045
655
static int start_mandos_communication(const char *ip, in_port_t port,
1056
666
int retval = -1;
1057
667
gnutls_session_t session;
1058
668
int pf; /* Protocol family */
1059
bool route_added = false;
1060
669
1061
670
errno = 0;
1062
671
1084
693
bool match = false;
1085
694
{
1086
695
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
1090
698
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
699
match = true;
1092
700
break;
1121
729
PRIuMAX "\n", ip, (uintmax_t)port);
1122
730
}
1123
731
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
1125
733
if(tcp_sd < 0){
1126
734
int e = errno;
1127
735
perror_plus("socket");
1134
742
goto mandos_end;
1135
743
}
1136
744
745
memset(&to, 0, sizeof(to));
1137
746
if(af == AF_INET6){
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
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);
1141
749
} else { /* IPv4 */
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
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);
1145
752
}
1146
753
if(ret < 0 ){
1147
754
int e = errno;
1217
824
goto mandos_end;
1218
825
}
1219
826
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
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;
1275
846
}
1276
847
1277
848
const char *out = mandos_protocol_version;
1431
1002
&decrypted_buffer, mc);
1432
1003
if(decrypted_buffer_size >= 0){
1433
1004
1434
clearerr(stdout);
1435
1005
written = 0;
1436
1006
while(written < (size_t) decrypted_buffer_size){
1437
1007
if(quit_now){
1453
1023
}
1454
1024
written += (size_t)ret;
1455
1025
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1466
1026
retval = 0;
1467
1027
}
1468
1028
}
1471
1031
1472
1032
mandos_end:
1473
1033
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
1480
1034
int e = errno;
1481
1035
free(decrypted_buffer);
1482
1036
free(buffer);
1483
1037
if(tcp_sd >= 0){
1484
ret = close(tcp_sd);
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1485
1039
}
1486
1040
if(ret == -1){
1487
1041
if(e == 0){
1499
1053
return retval;
1500
1054
}
1501
1055
1056
__attribute__((nonnull))
1502
1057
static void resolve_callback(AvahiSServiceResolver *r,
1503
1058
AvahiIfIndex interface,
1504
1059
AvahiProtocol proto,
1641
1196
__attribute__((nonnull, warn_unused_result))
1642
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
1198
int ret;
1644
int old_errno;
1199
error_t ret_errno;
1645
1200
1646
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
1202
if(s < 0){
1648
old_errno = errno;
1203
ret_errno = errno;
1649
1204
perror_plus("socket");
1650
errno = old_errno;
1205
errno = ret_errno;
1651
1206
return false;
1652
1207
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1208
strcpy(ifr->ifr_name, ifname);
1655
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
1210
if(ret == -1){
1657
1211
if(debug){
1658
old_errno = errno;
1212
ret_errno = errno;
1659
1213
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1214
errno = ret_errno;
1666
1215
}
1667
1216
return false;
1668
1217
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
1218
return true;
1675
1219
}
1676
1220
1918
1462
}
1919
1463
}
1920
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
1921
1517
__attribute__((nonnull))
1922
1518
void run_network_hooks(const char *mode, const char *interface,
1923
1519
const float delay){
1924
1520
struct dirent **direntries = NULL;
1925
1521
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1522
hookdir_fd = open(hookdir, O_RDONLY);
1928
1523
if(hookdir_fd == -1){
1929
1524
if(errno == ENOENT){
1930
1525
if(debug){
1937
1532
return;
1938
1533
}
1939
1534
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1945
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
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__ */
1947
1547
if(numhooks == -1){
1948
1548
perror_plus("scandir");
1949
close(devnull);
1950
1549
return;
1951
1550
}
1952
1551
struct dirent *direntry;
1953
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1954
1554
for(int i = 0; i < numhooks; i++){
1955
1555
direntry = direntries[i];
1956
1556
if(debug){
1980
1580
perror_plus("setgroups");
1981
1581
_exit(EX_NOPERM);
1982
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
}
1983
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
1599
if(ret == -1){
1985
1600
perror_plus("setenv");
2020
1635
_exit(EX_OSERR);
2021
1636
}
2022
1637
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2026
1639
if(hook_fd == -1){
2027
1640
perror_plus("openat");
2028
1641
_exit(EXIT_FAILURE);
2029
1642
}
2030
if(close(hookdir_fd) == -1){
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2031
1644
perror_plus("close");
2032
1645
_exit(EXIT_FAILURE);
2033
1646
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
1648
environ) == -1){
2051
1649
perror_plus("fexecve");
2052
1650
_exit(EXIT_FAILURE);
2053
1651
}
2054
1652
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
1653
int status;
2061
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
1655
perror_plus("waitpid");
2091
1684
free(direntry);
2092
1685
}
2093
1686
free(direntries);
2094
if(close(hookdir_fd) == -1){
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2095
1688
perror_plus("close");
2096
1689
} else {
2097
1690
hookdir_fd = -1;
2100
1693
}
2101
1694
2102
1695
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
1696
error_t bring_up_interface(const char *const interface,
1697
const float delay){
1698
error_t old_errno = errno;
2106
1699
int ret;
2107
1700
struct ifreq network;
2108
1701
unsigned int if_index = if_nametoindex(interface);
2118
1711
}
2119
1712
2120
1713
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
1714
error_t ret_errno = 0, ioctl_errno = 0;
2123
1715
if(not get_flags(interface, &network)){
2124
1716
ret_errno = errno;
2125
1717
fprintf_plus(stderr, "Failed to get flags for interface "
2138
1730
}
2139
1731
2140
1732
if(quit_now){
2141
ret = close(sd);
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2142
1734
if(ret == -1){
2143
1735
perror_plus("close");
2144
1736
}
2194
1786
}
2195
1787
2196
1788
/* Close the socket */
2197
ret = close(sd);
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2198
1790
if(ret == -1){
2199
1791
perror_plus("close");
2200
1792
}
2212
1804
2213
1805
/* Sleep checking until interface is running.
2214
1806
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
1807
for(int i=0; i < delay * 4; i++){
2216
1808
if(interface_is_running(interface)){
2217
1809
break;
2218
1810
}
2228
1820
}
2229
1821
2230
1822
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
2233
1825
struct ifreq network;
2234
1826
unsigned int if_index = if_nametoindex(interface);
2235
1827
if(if_index == 0){
2238
1830
return ENXIO;
2239
1831
}
2240
1832
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
1833
error_t ret_errno = 0, ioctl_errno = 0;
2243
1834
if(not get_flags(interface, &network) and debug){
2244
1835
ret_errno = errno;
2245
1836
fprintf_plus(stderr, "Failed to get flags for interface "
2283
1874
}
2284
1875
2285
1876
/* Close the socket */
2286
int ret = close(sd);
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2287
1878
if(ret == -1){
2288
1879
perror_plus("close");
2289
1880
}
2304
1895
}
2305
1896
2306
1897
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
2312
1902
AvahiSServiceBrowser *sb = NULL;
2313
1903
error_t ret_errno;
2314
1904
int ret;
2323
1913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
1914
const char *seckey = PATHDIR "/" SECKEY;
2325
1915
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
1916
char *interfaces_hooks = NULL;
2328
1917
2329
1918
bool gnutls_initialized = false;
2382
1971
.doc = "Bit length of the prime number used in the"
2383
1972
" Diffie-Hellman key exchange",
2384
1973
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
2390
1974
{ .name = "priority", .key = 130,
2391
1975
.arg = "STRING",
2392
1976
.doc = "GnuTLS priority string for the TLS handshake",
2447
2031
}
2448
2032
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2449
2033
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2453
2034
case 130: /* --priority */
2454
2035
mc.priority = arg;
2455
2036
break;
2495
2076
.args_doc = "",
2496
2077
.doc = "Mandos client -- Get and decrypt"
2497
2078
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2079
ret = argp_parse(&argp, argc, argv,
2080
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2081
switch(ret){
2501
2082
case 0:
2502
2083
break;
2503
2084
case ENOMEM:
2504
2085
default:
2505
errno = ret_errno;
2086
errno = ret;
2506
2087
perror_plus("argp_parse");
2507
2088
exitcode = EX_OSERR;
2508
2089
goto end;
2511
2092
goto end;
2512
2093
}
2513
2094
}
2514
2095
2515
2096
{
2516
2097
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2098
<http://bugs.debian.org/633582> */
2518
2099
2519
2100
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2101
ret_errno = raise_privileges();
2102
if(ret_errno != 0){
2103
errno = ret_errno;
2523
2104
perror_plus("Failed to raise privileges");
2524
2105
} else {
2525
2106
struct stat st;
2541
2122
}
2542
2123
}
2543
2124
}
2544
close(seckey_fd);
2125
TEMP_FAILURE_RETRY(close(seckey_fd));
2545
2126
}
2546
2127
}
2547
2128
2548
2129
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
2130
int pubkey_fd = open(pubkey, O_RDONLY);
2550
2131
if(pubkey_fd == -1){
2562
2143
}
2563
2144
}
2564
2145
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2146
TEMP_FAILURE_RETRY(close(pubkey_fd));
2147
}
2148
}
2149
2591
2150
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2151
ret_errno = lower_privileges();
2152
if(ret_errno != 0){
2153
errno = ret_errno;
2595
2154
perror_plus("Failed to lower privileges");
2596
2155
}
2597
2156
}
2767
2326
errno = bring_up_interface(interface, delay);
2768
2327
if(not interface_was_up){
2769
2328
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2329
perror_plus("Failed to bring up interface");
2772
2330
} else {
2773
2331
errno = argz_add(&interfaces_to_take_down,
2774
2332
&interfaces_to_take_down_size,
2797
2355
goto end;
2798
2356
}
2799
2357
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
2801
2359
if(ret == -1){
2802
2360
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
2361
exitcode = EX_UNAVAILABLE;
2925
2483
2926
2484
/* Allocate a new server */
2927
2485
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2486
&config, NULL, NULL, &ret_errno);
2929
2487
2930
2488
/* Free the Avahi configuration data */
2931
2489
avahi_server_config_free(&config);
2934
2492
/* Check if creating the Avahi server object succeeded */
2935
2493
if(mc.server == NULL){
2936
2494
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2495
avahi_strerror(ret_errno));
2938
2496
exitcode = EX_UNAVAILABLE;
2939
2497
goto end;
2940
2498
}
2975
2533
end:
2976
2534
2977
2535
if(debug){
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2536
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2985
2537
}
2986
2538
2987
2539
/* Cleanup things */
2998
2550
2999
2551
if(gnutls_initialized){
3000
2552
gnutls_certificate_free_credentials(mc.cred);
2553
gnutls_global_deinit();
3001
2554
gnutls_dh_params_deinit(mc.dh_params);
3002
2555
}
3003
2556
3026
2579
3027
2580
/* Re-raise privileges */
3028
2581
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
2582
ret_errno = raise_privileges();
2583
if(ret_errno != 0){
2584
errno = ret_errno;
3032
2585
perror_plus("Failed to raise privileges");
3033
2586
} else {
3034
2587
3039
2592
/* Take down the network interfaces which were brought up */
3040
2593
{
3041
2594
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2597
interface))){
2598
ret_errno = take_down_interface(interface);
2599
if(ret_errno != 0){
2600
errno = ret_errno;
3048
2601
perror_plus("Failed to take down interface");
3049
2602
}
3050
2603
}
3055
2608
}
3056
2609
}
3057
2610
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
2611
ret_errno = lower_privileges_permanently();
2612
if(ret_errno != 0){
2613
errno = ret_errno;
3061
2614
perror_plus("Failed to lower privileges permanently");
3062
2615
}
3063
2616
}
3065
2618
free(interfaces_to_take_down);
3066
2619
free(interfaces_hooks);
3067
2620
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3122
2621
/* Removes the GPGME temp directory and all files inside */
3123
2622
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2623
struct dirent **direntries = NULL;
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2625
O_NOFOLLOW));
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2628
} else {
2629
#ifdef __GLIBC__
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2639
alphasort);
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2644
if(ret == -1){
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2648
}
2649
free(direntries[i]);
2650
}
2651
2652
/* need to clean even if 0 because man page doesn't specify */
2653
free(direntries);
2654
if(numentries == -1){
2655
perror_plus("scandir");
2656
}
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2660
}
2661
}
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2663
}
3125
2664
}
3126
2665
3127
2666
if(quit_now){
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