/mandos/release : revision 237.7.487

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

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

13

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

}

493

499

return plaintext_length;

494

500

}

495

501

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

496

509

__attribute__((warn_unused_result))

497

510

static const char *safer_gnutls_strerror(int value){

498

511

const char *ret = gnutls_strerror(value);

499

if(ret == NULL)

500

ret = "(unknown)";

501

return ret;

512

return safe_string(ret);

502

513

}

503

514

504

515

/* GnuTLS log function callback */

508

519

fprintf_plus(stderr, "GnuTLS: %s", string);

509

520

}

510

521

511

__attribute__((nonnull, warn_unused_result))

522

__attribute__((nonnull(1, 2, 4), warn_unused_result))

512

523

static int init_gnutls_global(const char *pubkeyfilename,

513

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

514

526

mandos_context *mc){

515

527

int ret;

528

unsigned int uret;

516

529

517

530

if(debug){

518

531

fprintf_plus(stderr, "Initializing GnuTLS\n");

519

532

}

520

533

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

528

534

if(debug){

529

535

/* "Use a log level over 10 to enable all debugging options."

530

536

* - GnuTLS manual

538

544

if(ret != GNUTLS_E_SUCCESS){

539

545

fprintf_plus(stderr, "GnuTLS memory error: %s\n",

540

546

safer_gnutls_strerror(ret));

541

gnutls_global_deinit();

542

547

return -1;

543

548

}

544

549

569

574

safer_gnutls_strerror(ret));

570

575

goto globalfail;

571

576

}

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

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 **)&params.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

close(dhpfile);

617

if(params.data == NULL){

618

dhparamsfilename = NULL;

619

}

620

if(dhparamsfilename == NULL){

621

break;

622

}

623

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

624

GNUTLS_X509_FMT_PEM);

625

if(ret != GNUTLS_E_SUCCESS){

626

fprintf_plus(stderr, "Failed to parse DH parameters in file"

627

" \"%s\": %s\n", dhparamsfilename,

628

safer_gnutls_strerror(ret));

629

dhparamsfilename = NULL;

630

}

631

free(params.data);

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

/* Find out the optimal number of DH bits */

637

/* Try to read the private key file */

638

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

buffer_capacity = incbuffer((char **)&buffer.data,

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

/* If successful, use buffer to parse private key */

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

689

if(ret != GNUTLS_E_SUCCESS){

690

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

" a GnuTLS security parameter \"%s\".\n",

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

726

" implies %u DH bits; using that.\n",

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

fprintf_plus(stderr, "Failed to get implied number of DH"

733

" bits for security parameter \"%s\"): %s\n",

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

741

mc->dh_bits);

742

}

743

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

744

if(ret != GNUTLS_E_SUCCESS){

745

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

746

" bits): %s\n", mc->dh_bits,

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

579

751

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

580

752

581

753

return 0;

583

755

globalfail:

584

756

585

757

gnutls_certificate_free_credentials(mc->cred);

586

gnutls_global_deinit();

587

758

gnutls_dh_params_deinit(mc->dh_params);

588

759

return -1;

589

760

}

641

812

/* ignore client certificate if any. */

642

813

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

814

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

645

646

815

return 0;

647

816

}

648

817

650

819

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

651

820

__attribute__((unused)) const char *txt){}

652

821

822

/* Set effective uid to 0, return errno */

823

__attribute__((warn_unused_result))

824

int raise_privileges(void){

825

int old_errno = errno;

826

int ret = 0;

827

if(seteuid(0) == -1){

828

ret = errno;

829

}

830

errno = old_errno;

831

return ret;

832

}

833

834

/* Set effective and real user ID to 0. Return errno. */

835

__attribute__((warn_unused_result))

836

int raise_privileges_permanently(void){

837

int old_errno = errno;

838

int ret = raise_privileges();

839

if(ret != 0){

840

errno = old_errno;

841

return ret;

842

}

843

if(setuid(0) == -1){

844

ret = errno;

845

}

846

errno = old_errno;

847

return ret;

848

}

849

850

/* Set effective user ID to unprivileged saved user ID */

851

__attribute__((warn_unused_result))

852

int lower_privileges(void){

853

int old_errno = errno;

854

int ret = 0;

855

if(seteuid(uid) == -1){

856

ret = errno;

857

}

858

errno = old_errno;

859

return ret;

860

}

861

862

/* Lower privileges permanently */

863

__attribute__((warn_unused_result))

864

int lower_privileges_permanently(void){

865

int old_errno = errno;

866

int ret = 0;

867

if(setuid(uid) == -1){

868

ret = errno;

869

}

870

errno = old_errno;

871

return ret;

872

}

873

874

/* Helper function to add_local_route() and delete_local_route() */

875

__attribute__((nonnull, warn_unused_result))

876

static bool add_delete_local_route(const bool add,

877

const char *address,

878

AvahiIfIndex if_index){

879

int ret;

880

char helper[] = "mandos-client-iprouteadddel";

881

char add_arg[] = "add";

882

char delete_arg[] = "delete";

883

char debug_flag[] = "--debug";

884

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

885

if(pluginhelperdir == NULL){

886

if(debug){

887

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

888

" variable not set; cannot run helper\n");

889

}

890

return false;

891

}

892

893

char interface[IF_NAMESIZE];

894

if(if_indextoname((unsigned int)if_index, interface) == NULL){

895

perror_plus("if_indextoname");

896

return false;

897

}

898

899

int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));

900

if(devnull == -1){

901

perror_plus("open(\"/dev/null\", O_RDONLY)");

902

return false;

903

}

904

pid_t pid = fork();

905

if(pid == 0){

906

/* Child */

907

/* Raise privileges */

908

errno = raise_privileges_permanently();

909

if(errno != 0){

910

perror_plus("Failed to raise privileges");

911

/* _exit(EX_NOPERM); */

912

} else {

913

/* Set group */

914

errno = 0;

915

ret = setgid(0);

916

if(ret == -1){

917

perror_plus("setgid");

918

_exit(EX_NOPERM);

919

}

920

/* Reset supplementary groups */

921

errno = 0;

922

ret = setgroups(0, NULL);

923

if(ret == -1){

924

perror_plus("setgroups");

925

_exit(EX_NOPERM);

926

}

927

}

928

ret = dup2(devnull, STDIN_FILENO);

929

if(ret == -1){

930

perror_plus("dup2(devnull, STDIN_FILENO)");

931

_exit(EX_OSERR);

932

}

933

ret = close(devnull);

934

if(ret == -1){

935

perror_plus("close");

936

_exit(EX_OSERR);

937

}

938

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

939

if(ret == -1){

940

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

941

_exit(EX_OSERR);

942

}

943

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

944

O_RDONLY

945

| O_DIRECTORY

946

| O_PATH

947

| O_CLOEXEC));

948

if(helperdir_fd == -1){

949

perror_plus("open");

950

_exit(EX_UNAVAILABLE);

951

}

952

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

953

helper, O_RDONLY));

954

if(helper_fd == -1){

955

perror_plus("openat");

956

close(helperdir_fd);

957

_exit(EX_UNAVAILABLE);

958

}

959

close(helperdir_fd);

960

#ifdef __GNUC__

961

#pragma GCC diagnostic push

962

#pragma GCC diagnostic ignored "-Wcast-qual"

963

#endif

964

if(fexecve(helper_fd, (char *const [])

965

{ helper, add ? add_arg : delete_arg, (char *)address,

966

interface, debug ? debug_flag : NULL, NULL },

967

environ) == -1){

968

#ifdef __GNUC__

969

#pragma GCC diagnostic pop

970

#endif

971

perror_plus("fexecve");

972

_exit(EXIT_FAILURE);

973

}

974

}

975

if(pid == -1){

976

perror_plus("fork");

977

return false;

978

}

979

int status;

980

pid_t pret = -1;

981

errno = 0;

982

do {

983

pret = waitpid(pid, &status, 0);

984

if(pret == -1 and errno == EINTR and quit_now){

985

int errno_raising = 0;

986

if((errno = raise_privileges()) != 0){

987

errno_raising = errno;

988

perror_plus("Failed to raise privileges in order to"

989

" kill helper program");

990

}

991

if(kill(pid, SIGTERM) == -1){

992

perror_plus("kill");

993

}

994

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

995

perror_plus("Failed to lower privileges after killing"

996

" helper program");

997

}

998

return false;

999

}

1000

} while(pret == -1 and errno == EINTR);

1001

if(pret == -1){

1002

perror_plus("waitpid");

1003

return false;

1004

}

1005

if(WIFEXITED(status)){

1006

if(WEXITSTATUS(status) != 0){

1007

fprintf_plus(stderr, "Error: iprouteadddel exited"

1008

" with status %d\n", WEXITSTATUS(status));

1009

return false;

1010

}

1011

return true;

1012

}

1013

if(WIFSIGNALED(status)){

1014

fprintf_plus(stderr, "Error: iprouteadddel died by"

1015

" signal %d\n", WTERMSIG(status));

1016

return false;

1017

}

1018

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1019

return false;

1020

}

1021

1022

__attribute__((nonnull, warn_unused_result))

1023

static bool add_local_route(const char *address,

1024

AvahiIfIndex if_index){

1025

if(debug){

1026

fprintf_plus(stderr, "Adding route to %s\n", address);

1027

}

1028

return add_delete_local_route(true, address, if_index);

1029

}

1030

1031

__attribute__((nonnull, warn_unused_result))

1032

static bool delete_local_route(const char *address,

1033

AvahiIfIndex if_index){

1034

if(debug){

1035

fprintf_plus(stderr, "Removing route to %s\n", address);

1036

}

1037

return add_delete_local_route(false, address, if_index);

1038

}

1039

653

1040

/* Called when a Mandos server is found */

654

1041

__attribute__((nonnull, warn_unused_result))

655

1042

static int start_mandos_communication(const char *ip, in_port_t port,

666

1053

int retval = -1;

667

1054

gnutls_session_t session;

668

1055

int pf; /* Protocol family */

1056

bool route_added = false;

669

1057

670

1058

errno = 0;

671

1059

693

1081

bool match = false;

694

1082

{

695

1083

char *interface = NULL;

696

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

697

interface))){

1084

while((interface = argz_next(mc->interfaces,

1085

mc->interfaces_size,

1086

interface))){

698

1087

if(if_nametoindex(interface) == (unsigned int)if_index){

699

1088

match = true;

700

1089

break;

729

1118

PRIuMAX "\n", ip, (uintmax_t)port);

730

1119

}

731

1120

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

733

1122

if(tcp_sd < 0){

734

1123

int e = errno;

735

1124

perror_plus("socket");

742

1131

goto mandos_end;

743

1132

}

744

1133

745

memset(&to, 0, sizeof(to));

746

1134

if(af == AF_INET6){

747

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

748

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

1135

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1136

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1137

ret = inet_pton(af, ip, &to6->sin6_addr);

749

1138

} else { /* IPv4 */

750

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

751

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

1139

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1140

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1141

ret = inet_pton(af, ip, &to4->sin_addr);

752

1142

}

753

1143

if(ret < 0 ){

754

1144

int e = errno;

824

1214

goto mandos_end;

825

1215

}

826

1216

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;

1217

while(true){

1218

if(af == AF_INET6){

1219

ret = connect(tcp_sd, (struct sockaddr *)&to,

1220

sizeof(struct sockaddr_in6));

1221

} else {

1222

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

1223

sizeof(struct sockaddr_in));

1224

}

1225

if(ret < 0){

1226

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1227

and if_index != AVAHI_IF_UNSPEC

1228

and connect_to == NULL

1229

and not route_added and

1230

((af == AF_INET6 and not

1231

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1232

&to)->sin6_addr)))

1233

or (af == AF_INET and

1234

/* Not a a IPv4LL address */

1235

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1236

& 0xFFFF0000L) != 0xA9FE0000L))){

1237

/* Work around Avahi bug - Avahi does not announce link-local

1238

addresses if it has a global address, so local hosts with

1239

*only* a link-local address (e.g. Mandos clients) cannot

1240

connect to a Mandos server announced by Avahi on a server

1241

host with a global address. Work around this by retrying

1242

with an explicit route added with the server's address.

1243

1244

Avahi bug reference:

1245

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1246

https://bugs.debian.org/587961

1247

*/

1248

if(debug){

1249

fprintf_plus(stderr, "Mandos server unreachable, trying"

1250

" direct route\n");

1251

}

1252

int e = errno;

1253

route_added = add_local_route(ip, if_index);

1254

if(route_added){

1255

continue;

1256

}

1257

errno = e;

1258

}

1259

if(errno != ECONNREFUSED or debug){

1260

int e = errno;

1261

perror_plus("connect");

1262

errno = e;

1263

}

1264

goto mandos_end;

1265

}

1266

1267

if(quit_now){

1268

errno = EINTR;

1269

goto mandos_end;

1270

}

1271

break;

846

1272

}

847

1273

848

1274

const char *out = mandos_protocol_version;

1002

1428

&decrypted_buffer, mc);

1003

1429

if(decrypted_buffer_size >= 0){

1004

1430

1431

clearerr(stdout);

1005

1432

written = 0;

1006

1433

while(written < (size_t) decrypted_buffer_size){

1007

1434

if(quit_now){

1023

1450

}

1024

1451

written += (size_t)ret;

1025

1452

}

1453

ret = fflush(stdout);

1454

if(ret != 0){

1455

int e = errno;

1456

if(debug){

1457

fprintf_plus(stderr, "Error writing encrypted data: %s\n",

1458

strerror(errno));

1459

}

1460

errno = e;

1461

goto mandos_end;

1462

}

1026

1463

retval = 0;

1027

1464

}

1028

1465

}

1031

1468

1032

1469

mandos_end:

1033

1470

{

1471

if(route_added){

1472

if(not delete_local_route(ip, if_index)){

1473

fprintf_plus(stderr, "Failed to delete local route to %s on"

1474

" interface %d", ip, if_index);

1475

}

1476

}

1034

1477

int e = errno;

1035

1478

free(decrypted_buffer);

1036

1479

free(buffer);

1037

1480

if(tcp_sd >= 0){

1038

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

1481

ret = close(tcp_sd);

1039

1482

}

1040

1483

if(ret == -1){

1041

1484

if(e == 0){

1053

1496

return retval;

1054

1497

}

1055

1498

1056

__attribute__((nonnull))

1057

1499

static void resolve_callback(AvahiSServiceResolver *r,

1058

1500

AvahiIfIndex interface,

1059

1501

AvahiProtocol proto,

1196

1638

__attribute__((nonnull, warn_unused_result))

1197

1639

bool get_flags(const char *ifname, struct ifreq *ifr){

1198

1640

int ret;

1199

error_t ret_errno;

1641

int old_errno;

1200

1642

1201

1643

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1202

1644

if(s < 0){

1203

ret_errno = errno;

1645

old_errno = errno;

1204

1646

perror_plus("socket");

1205

errno = ret_errno;

1647

errno = old_errno;

1206

1648

return false;

1207

1649

}

1208

strcpy(ifr->ifr_name, ifname);

1650

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1651

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1209

1652

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1210

1653

if(ret == -1){

1211

1654

if(debug){

1212

ret_errno = errno;

1655

old_errno = errno;

1213

1656

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1657

errno = old_errno;

1215

1658

}

1659

close(s);

1216

1660

return false;

1217

1661

}

1662

close(s);

1218

1663

return true;

1219

1664

}

1220

1665

1462

1907

}

1463

1908

}

1464

1909

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

1517

1910

__attribute__((nonnull))

1518

1911

void run_network_hooks(const char *mode, const char *interface,

1519

1912

const float delay){

1520

1913

struct dirent **direntries = NULL;

1521

1914

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1915

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1916

| O_CLOEXEC);

1523

1917

if(hookdir_fd == -1){

1524

1918

if(errno == ENOENT){

1525

1919

if(debug){

1532

1926

return;

1533

1927

}

1534

1928

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1929

int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));

1930

if(devnull == -1){

1931

perror_plus("open(\"/dev/null\", O_RDONLY)");

1932

return;

1933

}

1537

1934

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1538

1935

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__ */

1547

1936

if(numhooks == -1){

1548

1937

perror_plus("scandir");

1938

close(devnull);

1549

1939

return;

1550

1940

}

1551

1941

struct dirent *direntry;

1552

1942

int ret;

1553

int devnull = open("/dev/null", O_RDONLY);

1554

1943

for(int i = 0; i < numhooks; i++){

1555

1944

direntry = direntries[i];

1556

1945

if(debug){

1580

1969

perror_plus("setgroups");

1581

1970

_exit(EX_NOPERM);

1582

1971

}

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

}

1598

1972

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1599

1973

if(ret == -1){

1600

1974

perror_plus("setenv");

1635

2009

_exit(EX_OSERR);

1636

2010

}

1637

2011

}

1638

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

2012

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2013

direntry->d_name,

2014

O_RDONLY));

1639

2015

if(hook_fd == -1){

1640

2016

perror_plus("openat");

1641

2017

_exit(EXIT_FAILURE);

1642

2018

}

1643

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

2019

if(close(hookdir_fd) == -1){

1644

2020

perror_plus("close");

1645

2021

_exit(EXIT_FAILURE);

1646

2022

}

2023

ret = dup2(devnull, STDIN_FILENO);

2024

if(ret == -1){

2025

perror_plus("dup2(devnull, STDIN_FILENO)");

2026

_exit(EX_OSERR);

2027

}

2028

ret = close(devnull);

2029

if(ret == -1){

2030

perror_plus("close");

2031

_exit(EX_OSERR);

2032

}

2033

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2034

if(ret == -1){

2035

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

2036

_exit(EX_OSERR);

2037

}

1647

2038

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1648

2039

environ) == -1){

1649

2040

perror_plus("fexecve");

1650

2041

_exit(EXIT_FAILURE);

1651

2042

}

1652

2043

} else {

2044

if(hook_pid == -1){

2045

perror_plus("fork");

2046

free(direntry);

2047

continue;

2048

}

1653

2049

int status;

1654

2050

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1655

2051

perror_plus("waitpid");

1684

2080

free(direntry);

1685

2081

}

1686

2082

free(direntries);

1687

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

2083

if(close(hookdir_fd) == -1){

1688

2084

perror_plus("close");

1689

2085

} else {

1690

2086

hookdir_fd = -1;

1693

2089

}

1694

2090

1695

2091

__attribute__((nonnull, warn_unused_result))

1696

error_t bring_up_interface(const char *const interface,

1697

const float delay){

1698

error_t old_errno = errno;

2092

int bring_up_interface(const char *const interface,

2093

const float delay){

2094

int old_errno = errno;

1699

2095

int ret;

1700

2096

struct ifreq network;

1701

2097

unsigned int if_index = if_nametoindex(interface);

1711

2107

}

1712

2108

1713

2109

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

2110

int ret_errno = 0;

2111

int ioctl_errno = 0;

1715

2112

if(not get_flags(interface, &network)){

1716

2113

ret_errno = errno;

1717

2114

fprintf_plus(stderr, "Failed to get flags for interface "

1730

2127

}

1731

2128

1732

2129

if(quit_now){

1733

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2130

ret = close(sd);

1734

2131

if(ret == -1){

1735

2132

perror_plus("close");

1736

2133

}

1786

2183

}

1787

2184

1788

2185

/* Close the socket */

1789

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2186

ret = close(sd);

1790

2187

if(ret == -1){

1791

2188

perror_plus("close");

1792

2189

}

1804

2201

1805

2202

/* Sleep checking until interface is running.

1806

2203

Check every 0.25s, up to total time of delay */

1807

for(int i=0; i < delay * 4; i++){

2204

for(int i = 0; i < delay * 4; i++){

1808

2205

if(interface_is_running(interface)){

1809

2206

break;

1810

2207

}

1820

2217

}

1821

2218

1822

2219

__attribute__((nonnull, warn_unused_result))

1823

error_t take_down_interface(const char *const interface){

1824

error_t old_errno = errno;

2220

int take_down_interface(const char *const interface){

2221

int old_errno = errno;

1825

2222

struct ifreq network;

1826

2223

unsigned int if_index = if_nametoindex(interface);

1827

2224

if(if_index == 0){

1830

2227

return ENXIO;

1831

2228

}

1832

2229

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

2230

int ret_errno = 0;

2231

int ioctl_errno = 0;

1834

2232

if(not get_flags(interface, &network) and debug){

1835

2233

ret_errno = errno;

1836

2234

fprintf_plus(stderr, "Failed to get flags for interface "

1874

2272

}

1875

2273

1876

2274

/* Close the socket */

1877

int ret = (int)TEMP_FAILURE_RETRY(close(sd));

2275

int ret = close(sd);

1878

2276

if(ret == -1){

1879

2277

perror_plus("close");

1880

2278

}

1895

2293

}

1896

2294

1897

2295

int main(int argc, char *argv[]){

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 };

2296

mandos_context mc = { .server = NULL, .dh_bits = 0,

2297

.priority = "SECURE256:!CTYPE-X.509"

2298

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2299

.current_server = NULL, .interfaces = NULL,

2300

.interfaces_size = 0 };

1902

2301

AvahiSServiceBrowser *sb = NULL;

1903

2302

error_t ret_errno;

1904

2303

int ret;

1913

2312

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1914

2313

const char *seckey = PATHDIR "/" SECKEY;

1915

2314

const char *pubkey = PATHDIR "/" PUBKEY;

2315

const char *dh_params_file = NULL;

1916

2316

char *interfaces_hooks = NULL;

1917

2317

1918

2318

bool gnutls_initialized = false;

1971

2371

.doc = "Bit length of the prime number used in the"

1972

2372

" Diffie-Hellman key exchange",

1973

2373

.group = 2 },

2374

{ .name = "dh-params", .key = 134,

2375

.arg = "FILE",

2376

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2377

" for the Diffie-Hellman key exchange",

2378

.group = 2 },

1974

2379

{ .name = "priority", .key = 130,

1975

2380

.arg = "STRING",

1976

2381

.doc = "GnuTLS priority string for the TLS handshake",

2031

2436

}

2032

2437

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

2033

2438

break;

2439

case 134: /* --dh-params */

2440

dh_params_file = arg;

2441

break;

2034

2442

case 130: /* --priority */

2035

2443

mc.priority = arg;

2036

2444

break;

2076

2484

.args_doc = "",

2077

2485

.doc = "Mandos client -- Get and decrypt"

2078

2486

" passwords from a Mandos server" };

2079

ret = argp_parse(&argp, argc, argv,

2080

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2081

switch(ret){

2487

ret_errno = argp_parse(&argp, argc, argv,

2488

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2489

switch(ret_errno){

2082

2490

case 0:

2083

2491

break;

2084

2492

case ENOMEM:

2085

2493

default:

2086

errno = ret;

2494

errno = ret_errno;

2087

2495

perror_plus("argp_parse");

2088

2496

exitcode = EX_OSERR;

2089

2497

goto end;

2092

2500

goto end;

2093

2501

}

2094

2502

}

2095

2503

2096

2504

{

2097

2505

/* Work around Debian bug #633582:

2098

<http://bugs.debian.org/633582> */

2506

<https://bugs.debian.org/633582> */

2099

2507

2100

2508

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2509

ret = raise_privileges();

2510

if(ret != 0){

2511

errno = ret;

2104

2512

perror_plus("Failed to raise privileges");

2105

2513

} else {

2106

2514

struct stat st;

2122

2530

}

2123

2531

}

2124

2532

}

2125

TEMP_FAILURE_RETRY(close(seckey_fd));

2533

close(seckey_fd);

2126

2534

}

2127

2535

}

2128

2536

2129

2537

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2130

2538

int pubkey_fd = open(pubkey, O_RDONLY);

2131

2539

if(pubkey_fd == -1){

2143

2551

}

2144

2552

}

2145

2553

}

2146

TEMP_FAILURE_RETRY(close(pubkey_fd));

2147

}

2148

}

2149

2554

close(pubkey_fd);

2555

}

2556

}

2557

2558

if(dh_params_file != NULL

2559

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2560

int dhparams_fd = open(dh_params_file, O_RDONLY);

2561

if(dhparams_fd == -1){

2562

perror_plus("open");

2563

} else {

2564

ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));

2565

if(ret == -1){

2566

perror_plus("fstat");

2567

} else {

2568

if(S_ISREG(st.st_mode)

2569

and st.st_uid == 0 and st.st_gid == 0){

2570

ret = fchown(dhparams_fd, uid, gid);

2571

if(ret == -1){

2572

perror_plus("fchown");

2573

}

2574

}

2575

}

2576

close(dhparams_fd);

2577

}

2578

}

2579

2150

2580

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2581

ret = lower_privileges();

2582

if(ret != 0){

2583

errno = ret;

2154

2584

perror_plus("Failed to lower privileges");

2155

2585

}

2156

2586

}

2326

2756

errno = bring_up_interface(interface, delay);

2327

2757

if(not interface_was_up){

2328

2758

if(errno != 0){

2329

perror_plus("Failed to bring up interface");

2759

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2760

" %s\n", interface, strerror(errno));

2330

2761

} else {

2331

2762

errno = argz_add(&interfaces_to_take_down,

2332

2763

&interfaces_to_take_down_size,

2355

2786

goto end;

2356

2787

}

2357

2788

2358

ret = init_gnutls_global(pubkey, seckey, &mc);

2789

ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);

2359

2790

if(ret == -1){

2360

2791

fprintf_plus(stderr, "init_gnutls_global failed\n");

2361

2792

exitcode = EX_UNAVAILABLE;

2483

2914

2484

2915

/* Allocate a new server */

2485

2916

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

2917

&config, NULL, NULL, &ret);

2487

2918

2488

2919

/* Free the Avahi configuration data */

2489

2920

avahi_server_config_free(&config);

2492

2923

/* Check if creating the Avahi server object succeeded */

2493

2924

if(mc.server == NULL){

2494

2925

fprintf_plus(stderr, "Failed to create Avahi server: %s\n",

2495

avahi_strerror(ret_errno));

2926

avahi_strerror(ret));

2496

2927

exitcode = EX_UNAVAILABLE;

2497

2928

goto end;

2498

2929

}

2533

2964

end:

2534

2965

2535

2966

if(debug){

2536

fprintf_plus(stderr, "%s exiting\n", argv[0]);

2967

if(signal_received){

2968

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2969

argv[0], signal_received,

2970

strsignal(signal_received));

2971

} else {

2972

fprintf_plus(stderr, "%s exiting\n", argv[0]);

2973

}

2537

2974

}

2538

2975

2539

2976

/* Cleanup things */

2550

2987

2551

2988

if(gnutls_initialized){

2552

2989

gnutls_certificate_free_credentials(mc.cred);

2553

gnutls_global_deinit();

2554

2990

gnutls_dh_params_deinit(mc.dh_params);

2555

2991

}

2556

2992

2579

3015

2580

3016

/* Re-raise privileges */

2581

3017

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

3018

ret = raise_privileges();

3019

if(ret != 0){

3020

errno = ret;

2585

3021

perror_plus("Failed to raise privileges");

2586

3022

} else {

2587

3023

2592

3028

/* Take down the network interfaces which were brought up */

2593

3029

{

2594

3030

char *interface = NULL;

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;

3031

while((interface = argz_next(interfaces_to_take_down,

3032

interfaces_to_take_down_size,

3033

interface))){

3034

ret = take_down_interface(interface);

3035

if(ret != 0){

3036

errno = ret;

2601

3037

perror_plus("Failed to take down interface");

2602

3038

}

2603

3039

}

2608

3044

}

2609

3045

}

2610

3046

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

3047

ret = lower_privileges_permanently();

3048

if(ret != 0){

3049

errno = ret;

2614

3050

perror_plus("Failed to lower privileges permanently");

2615

3051

}

2616

3052

}

2618

3054

free(interfaces_to_take_down);

2619

3055

free(interfaces_hooks);

2620

3056

3057

void clean_dir_at(int base, const char * const dirname,

3058

uintmax_t level){

3059

struct dirent **direntries = NULL;

3060

int dret;

3061

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3062

O_RDONLY

3063

| O_NOFOLLOW

3064

| O_DIRECTORY

3065

| O_PATH));

3066

if(dir_fd == -1){

3067

perror_plus("open");

3068

return;

3069

}

3070

int numentries = scandirat(dir_fd, ".", &direntries,

3071

notdotentries, alphasort);

3072

if(numentries >= 0){

3073

for(int i = 0; i < numentries; i++){

3074

if(debug){

3075

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3076

dirname, direntries[i]->d_name);

3077

}

3078

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3079

if(dret == -1){

3080

if(errno == EISDIR){

3081

dret = unlinkat(dir_fd, direntries[i]->d_name,

3082

AT_REMOVEDIR);

3083

}

3084

if((dret == -1) and (errno == ENOTEMPTY)

3085

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3086

== 0) and (level == 0)){

3087

/* Recurse only in this special case */

3088

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3089

dret = 0;

3090

}

3091

if((dret == -1) and (errno != ENOENT)){

3092

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3093

direntries[i]->d_name, strerror(errno));

3094

}

3095

}

3096

free(direntries[i]);

3097

}

3098

3099

/* need to clean even if 0 because man page doesn't specify */

3100

free(direntries);

3101

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3102

if(dret == -1 and errno != ENOENT){

3103

perror_plus("rmdir");

3104

}

3105

} else {

3106

perror_plus("scandirat");

3107

}

3108

close(dir_fd);

3109

}

3110

2621

3111

/* Removes the GPGME temp directory and all files inside */

2622

3112

if(tempdir != NULL){

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

}

3113

clean_dir_at(-1, tempdir, 0);

2664

3114

}

2665

3115

2666

3116

if(quit_now){