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- Committer: Teddy Hogeborn
- Date: 2015-05-23 20:18:34 UTC
- mto: This revision was merged to the branch mainline in revision 756.
- Revision ID: teddy@recompile.se-20150523201834-e89ex4ito93yni8x
mandos: Use multiprocessing module to run checkers.
For a long time, the Mandos server has occasionally logged the message
"ERROR: Child process vanished". This was never a fatal error, but it
has been annoying and slightly worrying, since a definite cause was
not found. One potential cause could be the "multiprocessing" and
"subprocess" modules conflicting w.r.t. SIGCHLD. To avoid this,
change the running of checkers from using subprocess.Popen
asynchronously to instead first create a multiprocessing.Process()
(which is asynchronous) calling a function, and have that function
then call subprocess.call() (which is synchronous). In this way, the
only thing using any asynchronous subprocesses is the multiprocessing
module.
This makes it necessary to change one small thing in the D-Bus API,
since the subprocesses.call() function does not expose the raw wait(2)
status value.
DBUS-API (CheckerCompleted): Change the second value provided by this
D-Bus signal from the raw wait(2) status
to the actual terminating signal number.
mandos (subprocess_call_pipe): New function to be called by
multiprocessing.Process (starting a
separate process).
(Client.last_checker signal): New attribute for signal which
terminated last checker. Like
last_checker_status, only not accessible
via D-Bus.
(Client.checker_callback): Take new "connection" argument and use it
to get returncode; set last_checker_signal.
Return False so gobject does not call this
callback again.
(Client.start_checker): Start checker using a multiprocessing.Process
instead of a subprocess.Popen.
(ClientDBus.checker_callback): Take new "connection" argument. Call
Client.checker_callback early to have
it set last_checker_status and
last_checker_signal; use those. Change
second value provided to D-Bus signal
CheckerCompleted to use
last_checker_signal if checker was
terminated by signal.
mandos-monitor: Update to reflect DBus API change.
(MandosClientWidget.checker_completed): Take "signal" instead of
"condition" argument. Use it
accordingly. Remove dead code
(os.WCOREDUMP case).
For a long time, the Mandos server has occasionally logged the message
"ERROR: Child process vanished". This was never a fatal error, but it
has been annoying and slightly worrying, since a definite cause was
not found. One potential cause could be the "multiprocessing" and
"subprocess" modules conflicting w.r.t. SIGCHLD. To avoid this,
change the running of checkers from using subprocess.Popen
asynchronously to instead first create a multiprocessing.Process()
(which is asynchronous) calling a function, and have that function
then call subprocess.call() (which is synchronous). In this way, the
only thing using any asynchronous subprocesses is the multiprocessing
module.
This makes it necessary to change one small thing in the D-Bus API,
since the subprocesses.call() function does not expose the raw wait(2)
status value.
DBUS-API (CheckerCompleted): Change the second value provided by this
D-Bus signal from the raw wait(2) status
to the actual terminating signal number.
mandos (subprocess_call_pipe): New function to be called by
multiprocessing.Process (starting a
separate process).
(Client.last_checker signal): New attribute for signal which
terminated last checker. Like
last_checker_status, only not accessible
via D-Bus.
(Client.checker_callback): Take new "connection" argument and use it
to get returncode; set last_checker_signal.
Return False so gobject does not call this
callback again.
(Client.start_checker): Start checker using a multiprocessing.Process
instead of a subprocess.Popen.
(ClientDBus.checker_callback): Take new "connection" argument. Call
Client.checker_callback early to have
it set last_checker_status and
last_checker_signal; use those. Change
second value provided to D-Bus signal
CheckerCompleted to use
last_checker_signal if checker was
terminated by signal.
mandos-monitor: Update to reflect DBus API change.
(MandosClientWidget.checker_completed): Take "signal" instead of
"condition" argument. Use it
accordingly. Remove dead code
(os.WCOREDUMP case).
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
}
518
513
fprintf_plus(stderr, "GnuTLS: %s", string);
519
514
}
520
515
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
522
517
static int init_gnutls_global(const char *pubkeyfilename,
523
518
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
519
mandos_context *mc){
526
520
int ret;
527
521
unsigned int uret;
530
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
525
}
532
526
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
533
534
if(debug){
534
535
/* "Use a log level over 10 to enable all debugging options."
535
536
* - GnuTLS manual
543
544
if(ret != GNUTLS_E_SUCCESS){
544
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
546
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
546
548
return -1;
547
549
}
548
550
573
575
safer_gnutls_strerror(ret));
574
576
goto globalfail;
575
577
}
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;
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;
587
585
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
592
590
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
591
free(buffer.data);
592
buffer.data = NULL;
596
593
break;
597
594
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
600
596
BUFFER_SIZE);
601
597
/* EOF */
602
598
if(bytes_read == 0){
605
601
/* check bytes_read for failure */
606
602
if(bytes_read < 0){
607
603
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);
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);
678
627
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
681
629
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
}
630
privkey = NULL;
706
631
}
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)));
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
}
716
644
}
717
645
}
718
646
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
722
650
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
725
653
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
654
(sec_param)));
728
655
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
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",
732
664
safe_string(gnutls_sec_param_get_name
733
665
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
666
mc->dh_bits);
736
667
}
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,
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)),
745
672
safer_gnutls_strerror(ret));
746
673
goto globalfail;
747
674
}
748
}
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
749
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
750
687
751
688
return 0;
753
690
globalfail:
754
691
755
692
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
756
694
gnutls_dh_params_deinit(mc->dh_params);
757
695
return -1;
758
696
}
810
748
/* ignore client certificate if any. */
811
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
750
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
813
753
return 0;
814
754
}
815
755
817
757
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
758
__attribute__((unused)) const char *txt){}
819
759
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
760
/* Called when a Mandos server is found */
1039
761
__attribute__((nonnull, warn_unused_result))
1040
762
static int start_mandos_communication(const char *ip, in_port_t port,
1051
773
int retval = -1;
1052
774
gnutls_session_t session;
1053
775
int pf; /* Protocol family */
1054
bool route_added = false;
1055
776
1056
777
errno = 0;
1057
778
1115
836
PRIuMAX "\n", ip, (uintmax_t)port);
1116
837
}
1117
838
1118
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
839
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
840
if(tcp_sd < 0){
1120
841
int e = errno;
1121
842
perror_plus("socket");
1128
849
goto mandos_end;
1129
850
}
1130
851
852
memset(&to, 0, sizeof(to));
1131
853
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);
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1135
856
} 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);
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1139
859
}
1140
860
if(ret < 0 ){
1141
861
int e = errno;
1211
931
goto mandos_end;
1212
932
}
1213
933
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;
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;
1269
953
}
1270
954
1271
955
const char *out = mandos_protocol_version;
1425
1109
&decrypted_buffer, mc);
1426
1110
if(decrypted_buffer_size >= 0){
1427
1111
1428
clearerr(stdout);
1429
1112
written = 0;
1430
1113
while(written < (size_t) decrypted_buffer_size){
1431
1114
if(quit_now){
1447
1130
}
1448
1131
written += (size_t)ret;
1449
1132
}
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
1133
retval = 0;
1461
1134
}
1462
1135
}
1465
1138
1466
1139
mandos_end:
1467
1140
{
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
1141
int e = errno;
1475
1142
free(decrypted_buffer);
1476
1143
free(buffer);
1477
1144
if(tcp_sd >= 0){
1478
ret = close(tcp_sd);
1145
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
1146
}
1480
1147
if(ret == -1){
1481
1148
if(e == 0){
1636
1303
__attribute__((nonnull, warn_unused_result))
1637
1304
bool get_flags(const char *ifname, struct ifreq *ifr){
1638
1305
int ret;
1639
int old_errno;
1306
error_t ret_errno;
1640
1307
1641
1308
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
1309
if(s < 0){
1643
old_errno = errno;
1310
ret_errno = errno;
1644
1311
perror_plus("socket");
1645
errno = old_errno;
1312
errno = ret_errno;
1646
1313
return false;
1647
1314
}
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1315
strcpy(ifr->ifr_name, ifname);
1650
1316
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1651
1317
if(ret == -1){
1652
1318
if(debug){
1653
old_errno = errno;
1319
ret_errno = errno;
1654
1320
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1321
errno = ret_errno;
1656
1322
}
1657
1323
return false;
1658
1324
}
1903
1569
}
1904
1570
}
1905
1571
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
1906
1624
__attribute__((nonnull))
1907
1625
void run_network_hooks(const char *mode, const char *interface,
1908
1626
const float delay){
1909
1627
struct dirent **direntries = NULL;
1910
1628
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
| O_CLOEXEC);
1629
hookdir_fd = open(hookdir, O_RDONLY);
1913
1630
if(hookdir_fd == -1){
1914
1631
if(errno == ENOENT){
1915
1632
if(debug){
1922
1639
return;
1923
1640
}
1924
1641
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1925
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
1645
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__ */
1927
1654
if(numhooks == -1){
1928
1655
perror_plus("scandir");
1929
1656
return;
1930
1657
}
1931
1658
struct dirent *direntry;
1932
1659
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
}
1660
int devnull = open("/dev/null", O_RDONLY);
1938
1661
for(int i = 0; i < numhooks; i++){
1939
1662
direntry = direntries[i];
1940
1663
if(debug){
1964
1687
perror_plus("setgroups");
1965
1688
_exit(EX_NOPERM);
1966
1689
}
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
}
1967
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
1706
if(ret == -1){
1969
1707
perror_plus("setenv");
2004
1742
_exit(EX_OSERR);
2005
1743
}
2006
1744
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2010
1746
if(hook_fd == -1){
2011
1747
perror_plus("openat");
2012
1748
_exit(EXIT_FAILURE);
2013
1749
}
2014
if(close(hookdir_fd) == -1){
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
1751
perror_plus("close");
2016
1752
_exit(EXIT_FAILURE);
2017
1753
}
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
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
1755
environ) == -1){
2035
1756
perror_plus("fexecve");
2075
1796
free(direntry);
2076
1797
}
2077
1798
free(direntries);
2078
if(close(hookdir_fd) == -1){
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2079
1800
perror_plus("close");
2080
1801
} else {
2081
1802
hookdir_fd = -1;
2084
1805
}
2085
1806
2086
1807
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
2090
1811
int ret;
2091
1812
struct ifreq network;
2092
1813
unsigned int if_index = if_nametoindex(interface);
2102
1823
}
2103
1824
2104
1825
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
1826
error_t ret_errno = 0, ioctl_errno = 0;
2107
1827
if(not get_flags(interface, &network)){
2108
1828
ret_errno = errno;
2109
1829
fprintf_plus(stderr, "Failed to get flags for interface "
2122
1842
}
2123
1843
2124
1844
if(quit_now){
2125
ret = close(sd);
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2126
1846
if(ret == -1){
2127
1847
perror_plus("close");
2128
1848
}
2178
1898
}
2179
1899
2180
1900
/* Close the socket */
2181
ret = close(sd);
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
1902
if(ret == -1){
2183
1903
perror_plus("close");
2184
1904
}
2212
1932
}
2213
1933
2214
1934
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
2217
1937
struct ifreq network;
2218
1938
unsigned int if_index = if_nametoindex(interface);
2219
1939
if(if_index == 0){
2222
1942
return ENXIO;
2223
1943
}
2224
1944
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
1945
error_t ret_errno = 0, ioctl_errno = 0;
2227
1946
if(not get_flags(interface, &network) and debug){
2228
1947
ret_errno = errno;
2229
1948
fprintf_plus(stderr, "Failed to get flags for interface "
2267
1986
}
2268
1987
2269
1988
/* Close the socket */
2270
int ret = close(sd);
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
1990
if(ret == -1){
2272
1991
perror_plus("close");
2273
1992
}
2289
2008
2290
2009
int main(int argc, char *argv[]){
2291
2010
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 };
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
2296
2014
AvahiSServiceBrowser *sb = NULL;
2297
2015
error_t ret_errno;
2298
2016
int ret;
2307
2025
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
2026
const char *seckey = PATHDIR "/" SECKEY;
2309
2027
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
2028
char *interfaces_hooks = NULL;
2312
2029
2313
2030
bool gnutls_initialized = false;
2366
2083
.doc = "Bit length of the prime number used in the"
2367
2084
" Diffie-Hellman key exchange",
2368
2085
.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
2086
{ .name = "priority", .key = 130,
2375
2087
.arg = "STRING",
2376
2088
.doc = "GnuTLS priority string for the TLS handshake",
2431
2143
}
2432
2144
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
2145
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
2146
case 130: /* --priority */
2438
2147
mc.priority = arg;
2439
2148
break;
2479
2188
.args_doc = "",
2480
2189
.doc = "Mandos client -- Get and decrypt"
2481
2190
" 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){
2191
ret = argp_parse(&argp, argc, argv,
2192
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2193
switch(ret){
2485
2194
case 0:
2486
2195
break;
2487
2196
case ENOMEM:
2488
2197
default:
2489
errno = ret_errno;
2198
errno = ret;
2490
2199
perror_plus("argp_parse");
2491
2200
exitcode = EX_OSERR;
2492
2201
goto end;
2495
2204
goto end;
2496
2205
}
2497
2206
}
2498
2207
2499
2208
{
2500
2209
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
2210
<http://bugs.debian.org/633582> */
2502
2211
2503
2212
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2507
2216
perror_plus("Failed to raise privileges");
2508
2217
} else {
2509
2218
struct stat st;
2525
2234
}
2526
2235
}
2527
2236
}
2528
close(seckey_fd);
2237
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
2238
}
2530
2239
}
2531
2240
2532
2241
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
2242
int pubkey_fd = open(pubkey, O_RDONLY);
2534
2243
if(pubkey_fd == -1){
2546
2255
}
2547
2256
}
2548
2257
}
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
2258
TEMP_FAILURE_RETRY(close(pubkey_fd));
2259
}
2260
}
2261
2575
2262
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2579
2266
perror_plus("Failed to lower privileges");
2580
2267
}
2581
2268
}
2751
2438
errno = bring_up_interface(interface, delay);
2752
2439
if(not interface_was_up){
2753
2440
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2441
perror_plus("Failed to bring up interface");
2756
2442
} else {
2757
2443
errno = argz_add(&interfaces_to_take_down,
2758
2444
&interfaces_to_take_down_size,
2781
2467
goto end;
2782
2468
}
2783
2469
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
2471
if(ret == -1){
2786
2472
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2473
exitcode = EX_UNAVAILABLE;
2909
2595
2910
2596
/* Allocate a new server */
2911
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
2598
&config, NULL, NULL, &ret_errno);
2913
2599
2914
2600
/* Free the Avahi configuration data */
2915
2601
avahi_server_config_free(&config);
2918
2604
/* Check if creating the Avahi server object succeeded */
2919
2605
if(mc.server == NULL){
2920
2606
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
2607
avahi_strerror(ret_errno));
2922
2608
exitcode = EX_UNAVAILABLE;
2923
2609
goto end;
2924
2610
}
2959
2645
end:
2960
2646
2961
2647
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
}
2648
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
2649
}
2970
2650
2971
2651
/* Cleanup things */
2982
2662
2983
2663
if(gnutls_initialized){
2984
2664
gnutls_certificate_free_credentials(mc.cred);
2665
gnutls_global_deinit();
2985
2666
gnutls_dh_params_deinit(mc.dh_params);
2986
2667
}
2987
2668
3010
2691
3011
2692
/* Re-raise privileges */
3012
2693
{
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
3016
2697
perror_plus("Failed to raise privileges");
3017
2698
} else {
3018
2699
3026
2707
while((interface=argz_next(interfaces_to_take_down,
3027
2708
interfaces_to_take_down_size,
3028
2709
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
3032
2713
perror_plus("Failed to take down interface");
3033
2714
}
3034
2715
}
3039
2720
}
3040
2721
}
3041
2722
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
3045
2726
perror_plus("Failed to lower privileges permanently");
3046
2727
}
3047
2728
}
3049
2730
free(interfaces_to_take_down);
3050
2731
free(interfaces_hooks);
3051
2732
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
2733
/* Removes the GPGME temp directory and all files inside */
3109
2734
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
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
}
3111
2776
}
3112
2777
3113
2778
if(quit_now){
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