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- Committer: Teddy Hogeborn
- Date: 2018-04-01 19:27:30 UTC
- Revision ID: teddy@recompile.se-20180401192730-jwr4io5cb3x5u268
Don't print NULL string pointers in error message output
* plugins.d/mandos-client.c (pgp_packet_decrypt): If decryption fails,
don't print unsupported_algorithm if it is NULL.
* plugins.d/mandos-client.c (pgp_packet_decrypt): If decryption fails,
don't print unsupported_algorithm if it is NULL.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 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
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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
60
inet_pton(), connect(),
59
61
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
64
*/
63
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
66
strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
305
311
return false;
306
312
}
307
313
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
309
315
if(ret == -1){
310
316
perror_plus("close");
311
317
}
414
420
if(result == NULL){
415
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
422
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
419
427
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
428
result->wrong_key_usage);
421
429
if(result->file_name != NULL){
513
521
fprintf_plus(stderr, "GnuTLS: %s", string);
514
522
}
515
523
516
__attribute__((nonnull, warn_unused_result))
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
525
static int init_gnutls_global(const char *pubkeyfilename,
518
526
const char *seckeyfilename,
527
const char *dhparamsfilename,
519
528
mandos_context *mc){
520
529
int ret;
521
530
unsigned int uret;
524
533
fprintf_plus(stderr, "Initializing GnuTLS\n");
525
534
}
526
535
527
ret = gnutls_global_init();
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
531
return -1;
532
}
533
534
536
if(debug){
535
537
/* "Use a log level over 10 to enable all debugging options."
536
538
* - GnuTLS manual
544
546
if(ret != GNUTLS_E_SUCCESS){
545
547
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
548
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
548
549
return -1;
549
550
}
550
551
575
576
safer_gnutls_strerror(ret));
576
577
goto globalfail;
577
578
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
585
590
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
590
595
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
593
599
break;
594
600
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
596
603
BUFFER_SIZE);
597
604
/* EOF */
598
605
if(bytes_read == 0){
601
608
/* check bytes_read for failure */
602
609
if(bytes_read < 0){
603
610
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
624
}
625
if(dhparamsfilename == NULL){
626
break;
627
}
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
635
}
636
free(params.data);
637
} while(false);
638
}
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
644
do {
645
int secfile = open(seckeyfilename, O_RDONLY);
646
if(secfile == -1){
647
perror_plus("open");
648
break;
649
}
650
size_t buffer_capacity = 0;
651
while(true){
652
buffer_capacity = incbuffer((char **)&buffer.data,
653
(size_t)buffer.size,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
657
free(buffer.data);
658
buffer.data = NULL;
659
break;
660
}
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
663
BUFFER_SIZE);
664
/* EOF */
665
if(bytes_read == 0){
666
break;
667
}
668
/* check bytes_read for failure */
669
if(bytes_read < 0){
670
perror_plus("read");
671
free(buffer.data);
672
buffer.data = NULL;
673
break;
674
}
675
buffer.size += (unsigned int)bytes_read;
676
}
677
close(secfile);
678
} while(false);
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
682
{
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
627
685
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
687
" structure: %s",
629
688
safer_gnutls_strerror(ret));
630
privkey = NULL;
689
free(buffer.data);
690
buffer.data = NULL;
691
} else {
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
697
privkey = NULL;
698
}
699
free(buffer.data);
700
buffer.data = NULL;
701
if(privkey != NULL){
702
/* Use private key to suggest an appropriate
703
sec_param */
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
706
if(debug){
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
710
(sec_param)));
711
}
712
}
631
713
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
714
}
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
718
if(debug){
719
fprintf_plus(stderr, "Falling back to security parameter"
720
" \"%s\"\n",
721
safe_string(gnutls_sec_param_get_name
722
(sec_param)));
644
723
}
645
724
}
646
725
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
727
if(uret != 0){
728
mc->dh_bits = uret;
650
729
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
653
732
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
733
(sec_param)),
734
mc->dh_bits);
655
735
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
736
} else {
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
664
739
safe_string(gnutls_sec_param_get_name
665
740
(sec_param)),
666
mc->dh_bits);
741
safer_gnutls_strerror(ret));
742
goto globalfail;
667
743
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
744
} else if(debug){
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
mc->dh_bits);
747
}
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
672
752
safer_gnutls_strerror(ret));
673
753
goto globalfail;
674
754
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
683
goto globalfail;
684
}
685
755
}
686
756
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
687
757
688
758
return 0;
690
760
globalfail:
691
761
692
762
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
694
763
gnutls_dh_params_deinit(mc->dh_params);
695
764
return -1;
696
765
}
748
817
/* ignore client certificate if any. */
749
818
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
819
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
753
820
return 0;
754
821
}
755
822
757
824
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
825
__attribute__((unused)) const char *txt){}
759
826
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
832
if(seteuid(0) == -1){
833
ret = errno;
834
}
835
errno = old_errno;
836
return ret;
837
}
838
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
if(ret != 0){
845
errno = old_errno;
846
return ret;
847
}
848
if(setuid(0) == -1){
849
ret = errno;
850
}
851
errno = old_errno;
852
return ret;
853
}
854
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
860
if(seteuid(uid) == -1){
861
ret = errno;
862
}
863
errno = old_errno;
864
return ret;
865
}
866
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
872
if(setuid(uid) == -1){
873
ret = errno;
874
}
875
errno = old_errno;
876
return ret;
877
}
878
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
882
const char *address,
883
AvahiIfIndex if_index){
884
int ret;
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
891
if(debug){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
894
}
895
return false;
896
}
897
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
901
return false;
902
}
903
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
905
if(devnull == -1){
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
return false;
908
}
909
pid_t pid = fork();
910
if(pid == 0){
911
/* Child */
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
914
if(errno != 0){
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
917
} else {
918
/* Set group */
919
errno = 0;
920
ret = setgid(0);
921
if(ret == -1){
922
perror_plus("setgid");
923
_exit(EX_NOPERM);
924
}
925
/* Reset supplementary groups */
926
errno = 0;
927
ret = setgroups(0, NULL);
928
if(ret == -1){
929
perror_plus("setgroups");
930
_exit(EX_NOPERM);
931
}
932
}
933
ret = dup2(devnull, STDIN_FILENO);
934
if(ret == -1){
935
perror_plus("dup2(devnull, STDIN_FILENO)");
936
_exit(EX_OSERR);
937
}
938
ret = close(devnull);
939
if(ret == -1){
940
perror_plus("close");
941
_exit(EX_OSERR);
942
}
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
944
if(ret == -1){
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
_exit(EX_OSERR);
947
}
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
O_RDONLY
950
| O_DIRECTORY
951
| O_PATH
952
| O_CLOEXEC));
953
if(helperdir_fd == -1){
954
perror_plus("open");
955
_exit(EX_UNAVAILABLE);
956
}
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
helper, O_RDONLY));
959
if(helper_fd == -1){
960
perror_plus("openat");
961
close(helperdir_fd);
962
_exit(EX_UNAVAILABLE);
963
}
964
close(helperdir_fd);
965
#ifdef __GNUC__
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
968
#endif
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
972
environ) == -1){
973
#ifdef __GNUC__
974
#pragma GCC diagnostic pop
975
#endif
976
perror_plus("fexecve");
977
_exit(EXIT_FAILURE);
978
}
979
}
980
if(pid == -1){
981
perror_plus("fork");
982
return false;
983
}
984
int status;
985
pid_t pret = -1;
986
errno = 0;
987
do {
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
995
}
996
if(kill(pid, SIGTERM) == -1){
997
perror_plus("kill");
998
}
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1001
" helper program");
1002
}
1003
return false;
1004
}
1005
} while(pret == -1 and errno == EINTR);
1006
if(pret == -1){
1007
perror_plus("waitpid");
1008
return false;
1009
}
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1014
return false;
1015
}
1016
return true;
1017
}
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1021
return false;
1022
}
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1024
return false;
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1032
}
1033
return add_delete_local_route(true, address, if_index);
1034
}
1035
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1039
if(debug){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1041
}
1042
return add_delete_local_route(false, address, if_index);
1043
}
1044
760
1045
/* Called when a Mandos server is found */
761
1046
__attribute__((nonnull, warn_unused_result))
762
1047
static int start_mandos_communication(const char *ip, in_port_t port,
773
1058
int retval = -1;
774
1059
gnutls_session_t session;
775
1060
int pf; /* Protocol family */
1061
bool route_added = false;
776
1062
777
1063
errno = 0;
778
1064
800
1086
bool match = false;
801
1087
{
802
1088
char *interface = NULL;
803
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
804
interface))){
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
805
1092
if(if_nametoindex(interface) == (unsigned int)if_index){
806
1093
match = true;
807
1094
break;
836
1123
PRIuMAX "\n", ip, (uintmax_t)port);
837
1124
}
838
1125
839
tcp_sd = socket(pf, SOCK_STREAM, 0);
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
840
1127
if(tcp_sd < 0){
841
1128
int e = errno;
842
1129
perror_plus("socket");
849
1136
goto mandos_end;
850
1137
}
851
1138
852
memset(&to, 0, sizeof(to));
853
1139
if(af == AF_INET6){
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
856
1143
} else { /* IPv4 */
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
859
1147
}
860
1148
if(ret < 0 ){
861
1149
int e = errno;
931
1219
goto mandos_end;
932
1220
}
933
1221
934
if(af == AF_INET6){
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
937
} else {
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
940
}
941
if(ret < 0){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
943
int e = errno;
944
perror_plus("connect");
945
errno = e;
946
}
947
goto mandos_end;
948
}
949
950
if(quit_now){
951
errno = EINTR;
952
goto mandos_end;
1222
while(true){
1223
if(af == AF_INET6){
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1226
} else {
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1229
}
1230
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1237
&to)->sin6_addr)))
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1248
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1252
*/
1253
if(debug){
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1255
" direct route\n");
1256
}
1257
int e = errno;
1258
route_added = add_local_route(ip, if_index);
1259
if(route_added){
1260
continue;
1261
}
1262
errno = e;
1263
}
1264
if(errno != ECONNREFUSED or debug){
1265
int e = errno;
1266
perror_plus("connect");
1267
errno = e;
1268
}
1269
goto mandos_end;
1270
}
1271
1272
if(quit_now){
1273
errno = EINTR;
1274
goto mandos_end;
1275
}
1276
break;
953
1277
}
954
1278
955
1279
const char *out = mandos_protocol_version;
1109
1433
&decrypted_buffer, mc);
1110
1434
if(decrypted_buffer_size >= 0){
1111
1435
1436
clearerr(stdout);
1112
1437
written = 0;
1113
1438
while(written < (size_t) decrypted_buffer_size){
1114
1439
if(quit_now){
1130
1455
}
1131
1456
written += (size_t)ret;
1132
1457
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
1133
1468
retval = 0;
1134
1469
}
1135
1470
}
1138
1473
1139
1474
mandos_end:
1140
1475
{
1476
if(route_added){
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1479
" interface %d", ip, if_index);
1480
}
1481
}
1141
1482
int e = errno;
1142
1483
free(decrypted_buffer);
1143
1484
free(buffer);
1144
1485
if(tcp_sd >= 0){
1145
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1486
ret = close(tcp_sd);
1146
1487
}
1147
1488
if(ret == -1){
1148
1489
if(e == 0){
1160
1501
return retval;
1161
1502
}
1162
1503
1163
__attribute__((nonnull))
1164
1504
static void resolve_callback(AvahiSServiceResolver *r,
1165
1505
AvahiIfIndex interface,
1166
1506
AvahiProtocol proto,
1303
1643
__attribute__((nonnull, warn_unused_result))
1304
1644
bool get_flags(const char *ifname, struct ifreq *ifr){
1305
1645
int ret;
1306
error_t ret_errno;
1646
int old_errno;
1307
1647
1308
1648
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1309
1649
if(s < 0){
1310
ret_errno = errno;
1650
old_errno = errno;
1311
1651
perror_plus("socket");
1312
errno = ret_errno;
1652
errno = old_errno;
1313
1653
return false;
1314
1654
}
1315
strcpy(ifr->ifr_name, ifname);
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1316
1657
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1317
1658
if(ret == -1){
1318
1659
if(debug){
1319
ret_errno = errno;
1660
old_errno = errno;
1320
1661
perror_plus("ioctl SIOCGIFFLAGS");
1321
errno = ret_errno;
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1322
1668
}
1323
1669
return false;
1324
1670
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1325
1676
return true;
1326
1677
}
1327
1678
1569
1920
}
1570
1921
}
1571
1922
1572
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1574
error_t raise_privileges(void){
1575
error_t old_errno = errno;
1576
error_t ret_errno = 0;
1577
if(seteuid(0) == -1){
1578
ret_errno = errno;
1579
}
1580
errno = old_errno;
1581
return ret_errno;
1582
}
1583
1584
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1586
error_t raise_privileges_permanently(void){
1587
error_t old_errno = errno;
1588
error_t ret_errno = raise_privileges();
1589
if(ret_errno != 0){
1590
errno = old_errno;
1591
return ret_errno;
1592
}
1593
if(setuid(0) == -1){
1594
ret_errno = errno;
1595
}
1596
errno = old_errno;
1597
return ret_errno;
1598
}
1599
1600
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
error_t lower_privileges(void){
1603
error_t old_errno = errno;
1604
error_t ret_errno = 0;
1605
if(seteuid(uid) == -1){
1606
ret_errno = errno;
1607
}
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
error_t lower_privileges_permanently(void){
1615
error_t old_errno = errno;
1616
error_t ret_errno = 0;
1617
if(setuid(uid) == -1){
1618
ret_errno = errno;
1619
}
1620
errno = old_errno;
1621
return ret_errno;
1622
}
1623
1624
1923
__attribute__((nonnull))
1625
1924
void run_network_hooks(const char *mode, const char *interface,
1626
1925
const float delay){
1627
1926
struct dirent **direntries = NULL;
1628
1927
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1929
| O_CLOEXEC);
1630
1930
if(hookdir_fd == -1){
1631
1931
if(errno == ENOENT){
1632
1932
if(debug){
1639
1939
return;
1640
1940
}
1641
1941
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1644
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
1948
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
1654
1949
if(numhooks == -1){
1655
1950
perror_plus("scandir");
1951
close(devnull);
1656
1952
return;
1657
1953
}
1658
1954
struct dirent *direntry;
1659
1955
int ret;
1660
int devnull = open("/dev/null", O_RDONLY);
1661
1956
for(int i = 0; i < numhooks; i++){
1662
1957
direntry = direntries[i];
1663
1958
if(debug){
1687
1982
perror_plus("setgroups");
1688
1983
_exit(EX_NOPERM);
1689
1984
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
1705
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1706
1986
if(ret == -1){
1707
1987
perror_plus("setenv");
1742
2022
_exit(EX_OSERR);
1743
2023
}
1744
2024
}
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2026
direntry->d_name,
2027
O_RDONLY));
1746
2028
if(hook_fd == -1){
1747
2029
perror_plus("openat");
1748
2030
_exit(EXIT_FAILURE);
1749
2031
}
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2032
if(close(hookdir_fd) == -1){
1751
2033
perror_plus("close");
1752
2034
_exit(EXIT_FAILURE);
1753
2035
}
2036
ret = dup2(devnull, STDIN_FILENO);
2037
if(ret == -1){
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
_exit(EX_OSERR);
2040
}
2041
ret = close(devnull);
2042
if(ret == -1){
2043
perror_plus("close");
2044
_exit(EX_OSERR);
2045
}
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2047
if(ret == -1){
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
_exit(EX_OSERR);
2050
}
1754
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1755
2052
environ) == -1){
1756
2053
perror_plus("fexecve");
1796
2093
free(direntry);
1797
2094
}
1798
2095
free(direntries);
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2096
if(close(hookdir_fd) == -1){
1800
2097
perror_plus("close");
1801
2098
} else {
1802
2099
hookdir_fd = -1;
1805
2102
}
1806
2103
1807
2104
__attribute__((nonnull, warn_unused_result))
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
1811
2108
int ret;
1812
2109
struct ifreq network;
1813
2110
unsigned int if_index = if_nametoindex(interface);
1823
2120
}
1824
2121
1825
2122
if(not interface_is_up(interface)){
1826
error_t ret_errno = 0, ioctl_errno = 0;
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
1827
2125
if(not get_flags(interface, &network)){
1828
2126
ret_errno = errno;
1829
2127
fprintf_plus(stderr, "Failed to get flags for interface "
1842
2140
}
1843
2141
1844
2142
if(quit_now){
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2143
ret = close(sd);
1846
2144
if(ret == -1){
1847
2145
perror_plus("close");
1848
2146
}
1898
2196
}
1899
2197
1900
2198
/* Close the socket */
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2199
ret = close(sd);
1902
2200
if(ret == -1){
1903
2201
perror_plus("close");
1904
2202
}
1916
2214
1917
2215
/* Sleep checking until interface is running.
1918
2216
Check every 0.25s, up to total time of delay */
1919
for(int i=0; i < delay * 4; i++){
2217
for(int i = 0; i < delay * 4; i++){
1920
2218
if(interface_is_running(interface)){
1921
2219
break;
1922
2220
}
1932
2230
}
1933
2231
1934
2232
__attribute__((nonnull, warn_unused_result))
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
1937
2235
struct ifreq network;
1938
2236
unsigned int if_index = if_nametoindex(interface);
1939
2237
if(if_index == 0){
1942
2240
return ENXIO;
1943
2241
}
1944
2242
if(interface_is_up(interface)){
1945
error_t ret_errno = 0, ioctl_errno = 0;
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
1946
2245
if(not get_flags(interface, &network) and debug){
1947
2246
ret_errno = errno;
1948
2247
fprintf_plus(stderr, "Failed to get flags for interface "
1986
2285
}
1987
2286
1988
2287
/* Close the socket */
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
int ret = close(sd);
1990
2289
if(ret == -1){
1991
2290
perror_plus("close");
1992
2291
}
2008
2307
2009
2308
int main(int argc, char *argv[]){
2010
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
2014
2314
AvahiSServiceBrowser *sb = NULL;
2015
2315
error_t ret_errno;
2016
2316
int ret;
2025
2325
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2026
2326
const char *seckey = PATHDIR "/" SECKEY;
2027
2327
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2028
2329
char *interfaces_hooks = NULL;
2029
2330
2030
2331
bool gnutls_initialized = false;
2083
2384
.doc = "Bit length of the prime number used in the"
2084
2385
" Diffie-Hellman key exchange",
2085
2386
.group = 2 },
2387
{ .name = "dh-params", .key = 134,
2388
.arg = "FILE",
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2391
.group = 2 },
2086
2392
{ .name = "priority", .key = 130,
2087
2393
.arg = "STRING",
2088
2394
.doc = "GnuTLS priority string for the TLS handshake",
2143
2449
}
2144
2450
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2145
2451
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
2146
2455
case 130: /* --priority */
2147
2456
mc.priority = arg;
2148
2457
break;
2188
2497
.args_doc = "",
2189
2498
.doc = "Mandos client -- Get and decrypt"
2190
2499
" passwords from a Mandos server" };
2191
ret = argp_parse(&argp, argc, argv,
2192
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2193
switch(ret){
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
2194
2503
case 0:
2195
2504
break;
2196
2505
case ENOMEM:
2197
2506
default:
2198
errno = ret;
2507
errno = ret_errno;
2199
2508
perror_plus("argp_parse");
2200
2509
exitcode = EX_OSERR;
2201
2510
goto end;
2204
2513
goto end;
2205
2514
}
2206
2515
}
2207
2516
2208
2517
{
2209
2518
/* Work around Debian bug #633582:
2210
<http://bugs.debian.org/633582> */
2519
<https://bugs.debian.org/633582> */
2211
2520
2212
2521
/* Re-raise privileges */
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2216
2525
perror_plus("Failed to raise privileges");
2217
2526
} else {
2218
2527
struct stat st;
2234
2543
}
2235
2544
}
2236
2545
}
2237
TEMP_FAILURE_RETRY(close(seckey_fd));
2546
close(seckey_fd);
2238
2547
}
2239
2548
}
2240
2549
2241
2550
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2242
2551
int pubkey_fd = open(pubkey, O_RDONLY);
2243
2552
if(pubkey_fd == -1){
2255
2564
}
2256
2565
}
2257
2566
}
2258
TEMP_FAILURE_RETRY(close(pubkey_fd));
2259
}
2260
}
2261
2567
close(pubkey_fd);
2568
}
2569
}
2570
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2576
} else {
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2578
if(ret == -1){
2579
perror_plus("fstat");
2580
} else {
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2584
if(ret == -1){
2585
perror_plus("fchown");
2586
}
2587
}
2588
}
2589
close(dhparams_fd);
2590
}
2591
}
2592
2262
2593
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2266
2597
perror_plus("Failed to lower privileges");
2267
2598
}
2268
2599
}
2438
2769
errno = bring_up_interface(interface, delay);
2439
2770
if(not interface_was_up){
2440
2771
if(errno != 0){
2441
perror_plus("Failed to bring up interface");
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2442
2774
} else {
2443
2775
errno = argz_add(&interfaces_to_take_down,
2444
2776
&interfaces_to_take_down_size,
2467
2799
goto end;
2468
2800
}
2469
2801
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2471
2803
if(ret == -1){
2472
2804
fprintf_plus(stderr, "init_gnutls_global failed\n");
2473
2805
exitcode = EX_UNAVAILABLE;
2595
2927
2596
2928
/* Allocate a new server */
2597
2929
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2598
&config, NULL, NULL, &ret_errno);
2930
&config, NULL, NULL, &ret);
2599
2931
2600
2932
/* Free the Avahi configuration data */
2601
2933
avahi_server_config_free(&config);
2604
2936
/* Check if creating the Avahi server object succeeded */
2605
2937
if(mc.server == NULL){
2606
2938
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2607
avahi_strerror(ret_errno));
2939
avahi_strerror(ret));
2608
2940
exitcode = EX_UNAVAILABLE;
2609
2941
goto end;
2610
2942
}
2645
2977
end:
2646
2978
2647
2979
if(debug){
2648
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
2649
2987
}
2650
2988
2651
2989
/* Cleanup things */
2662
3000
2663
3001
if(gnutls_initialized){
2664
3002
gnutls_certificate_free_credentials(mc.cred);
2665
gnutls_global_deinit();
2666
3003
gnutls_dh_params_deinit(mc.dh_params);
2667
3004
}
2668
3005
2691
3028
2692
3029
/* Re-raise privileges */
2693
3030
{
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
2697
3034
perror_plus("Failed to raise privileges");
2698
3035
} else {
2699
3036
2704
3041
/* Take down the network interfaces which were brought up */
2705
3042
{
2706
3043
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
errno = ret;
2713
3050
perror_plus("Failed to take down interface");
2714
3051
}
2715
3052
}
2720
3057
}
2721
3058
}
2722
3059
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
2726
3063
perror_plus("Failed to lower privileges permanently");
2727
3064
}
2728
3065
}
2730
3067
free(interfaces_to_take_down);
2731
3068
free(interfaces_hooks);
2732
3069
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
3072
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
3086
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
2733
3124
/* Removes the GPGME temp directory and all files inside */
2734
3125
if(tempdir != NULL){
2735
struct dirent **direntries = NULL;
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
2773
}
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2775
}
3126
clean_dir_at(-1, tempdir, 0);
2776
3127
}
2777
3128
2778
3129
if(quit_now){
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