/mandos/release : revision 237.7.492

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

}

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){

493

501

return plaintext_length;

494

502

}

495

503

504

__attribute__((warn_unused_result, const))

505

static const char *safe_string(const char *str){

506

if(str == NULL)

507

return "(unknown)";

508

return str;

509

}

510

496

511

__attribute__((warn_unused_result))

497

512

static const char *safer_gnutls_strerror(int value){

498

513

const char *ret = gnutls_strerror(value);

499

if(ret == NULL)

500

ret = "(unknown)";

501

return ret;

514

return safe_string(ret);

502

515

}

503

516

504

517

/* GnuTLS log function callback */

508

521

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

509

522

}

510

523

511

__attribute__((nonnull, warn_unused_result))

524

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

512

525

static int init_gnutls_global(const char *pubkeyfilename,

513

526

const char *seckeyfilename,

527

const char *dhparamsfilename,

514

528

mandos_context *mc){

515

529

int ret;

530

unsigned int uret;

516

531

517

532

if(debug){

518

533

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

519

534

}

520

535

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

536

if(debug){

529

537

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

530

538

* - GnuTLS manual

538

546

if(ret != GNUTLS_E_SUCCESS){

539

547

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

540

548

safer_gnutls_strerror(ret));

541

gnutls_global_deinit();

542

549

return -1;

543

550

}

544

551

569

576

safer_gnutls_strerror(ret));

570

577

goto globalfail;

571

578

}

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

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;

590

while(true){

591

params_capacity = incbuffer((char **)&params.data,

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

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, &params,

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);

685

if(ret != GNUTLS_E_SUCCESS){

686

fprintf_plus(stderr, "Error initializing OpenPGP key"

687

" structure: %s",

688

safer_gnutls_strerror(ret));

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

}

713

}

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)));

723

}

724

}

725

}

726

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

727

if(uret != 0){

728

mc->dh_bits = uret;

729

if(debug){

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

mc->dh_bits);

735

}

736

} else {

737

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

738

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

739

safe_string(gnutls_sec_param_get_name

740

(sec_param)),

741

safer_gnutls_strerror(ret));

742

goto globalfail;

743

}

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,

752

safer_gnutls_strerror(ret));

753

goto globalfail;

754

}

755

}

579

756

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

580

757

581

758

return 0;

583

760

globalfail:

584

761

585

762

gnutls_certificate_free_credentials(mc->cred);

586

gnutls_global_deinit();

587

763

gnutls_dh_params_deinit(mc->dh_params);

588

764

return -1;

589

765

}

641

817

/* ignore client certificate if any. */

642

818

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

819

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

645

646

820

return 0;

647

821

}

648

822

650

824

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

651

825

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

652

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

653

1045

/* Called when a Mandos server is found */

654

1046

__attribute__((nonnull, warn_unused_result))

655

1047

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

666

1058

int retval = -1;

667

1059

gnutls_session_t session;

668

1060

int pf; /* Protocol family */

1061

bool route_added = false;

669

1062

670

1063

errno = 0;

671

1064

693

1086

bool match = false;

694

1087

{

695

1088

char *interface = NULL;

696

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

697

interface))){

1089

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

1090

mc->interfaces_size,

1091

interface))){

698

1092

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

699

1093

match = true;

700

1094

break;

729

1123

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

730

1124

}

731

1125

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

1126

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

733

1127

if(tcp_sd < 0){

734

1128

int e = errno;

735

1129

perror_plus("socket");

742

1136

goto mandos_end;

743

1137

}

744

1138

745

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

746

1139

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);

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);

749

1143

} 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);

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);

752

1147

}

753

1148

if(ret < 0 ){

754

1149

int e = errno;

824

1219

goto mandos_end;

825

1220

}

826

1221

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;

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;

846

1277

}

847

1278

848

1279

const char *out = mandos_protocol_version;

1002

1433

&decrypted_buffer, mc);

1003

1434

if(decrypted_buffer_size >= 0){

1004

1435

1436

clearerr(stdout);

1005

1437

written = 0;

1006

1438

while(written < (size_t) decrypted_buffer_size){

1007

1439

if(quit_now){

1023

1455

}

1024

1456

written += (size_t)ret;

1025

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

}

1026

1468

retval = 0;

1027

1469

}

1028

1470

}

1031

1473

1032

1474

mandos_end:

1033

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

}

1034

1482

int e = errno;

1035

1483

free(decrypted_buffer);

1036

1484

free(buffer);

1037

1485

if(tcp_sd >= 0){

1038

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

1486

ret = close(tcp_sd);

1039

1487

}

1040

1488

if(ret == -1){

1041

1489

if(e == 0){

1053

1501

return retval;

1054

1502

}

1055

1503

1056

__attribute__((nonnull))

1057

1504

static void resolve_callback(AvahiSServiceResolver *r,

1058

1505

AvahiIfIndex interface,

1059

1506

AvahiProtocol proto,

1196

1643

__attribute__((nonnull, warn_unused_result))

1197

1644

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

1198

1645

int ret;

1199

error_t ret_errno;

1646

int old_errno;

1200

1647

1201

1648

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

1202

1649

if(s < 0){

1203

ret_errno = errno;

1650

old_errno = errno;

1204

1651

perror_plus("socket");

1205

errno = ret_errno;

1652

errno = old_errno;

1206

1653

return false;

1207

1654

}

1208

strcpy(ifr->ifr_name, ifname);

1655

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

1656

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

1209

1657

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1210

1658

if(ret == -1){

1211

1659

if(debug){

1212

ret_errno = errno;

1660

old_errno = errno;

1213

1661

perror_plus("ioctl SIOCGIFFLAGS");

1214

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;

1215

1668

}

1216

1669

return false;

1217

1670

}

1671

if((close(s) == -1) and debug){

1672

old_errno = errno;

1673

perror_plus("close");

1674

errno = old_errno;

1675

}

1218

1676

return true;

1219

1677

}

1220

1678

1462

1920

}

1463

1921

}

1464

1922

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

1923

__attribute__((nonnull))

1518

1924

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

1519

1925

const float delay){

1520

1926

struct dirent **direntries = NULL;

1521

1927

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1928

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1929

| O_CLOEXEC);

1523

1930

if(hookdir_fd == -1){

1524

1931

if(errno == ENOENT){

1525

1932

if(debug){

1532

1939

return;

1533

1940

}

1534

1941

}

1535

#ifdef __GLIBC__

1536

#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

}

1537

1947

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

1538

1948

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

1949

if(numhooks == -1){

1548

1950

perror_plus("scandir");

1951

close(devnull);

1549

1952

return;

1550

1953

}

1551

1954

struct dirent *direntry;

1552

1955

int ret;

1553

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

1554

1956

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

1555

1957

direntry = direntries[i];

1556

1958

if(debug){

1580

1982

perror_plus("setgroups");

1581

1983

_exit(EX_NOPERM);

1582

1984

}

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

1985

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

1599

1986

if(ret == -1){

1600

1987

perror_plus("setenv");

1635

2022

_exit(EX_OSERR);

1636

2023

}

1637

2024

}

1638

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));

1639

2028

if(hook_fd == -1){

1640

2029

perror_plus("openat");

1641

2030

_exit(EXIT_FAILURE);

1642

2031

}

1643

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

2032

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

1644

2033

perror_plus("close");

1645

2034

_exit(EXIT_FAILURE);

1646

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

}

1647

2051

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

1648

2052

environ) == -1){

1649

2053

perror_plus("fexecve");

1650

2054

_exit(EXIT_FAILURE);

1651

2055

}

1652

2056

} else {

2057

if(hook_pid == -1){

2058

perror_plus("fork");

2059

free(direntry);

2060

continue;

2061

}

1653

2062

int status;

1654

2063

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

1655

2064

perror_plus("waitpid");

1684

2093

free(direntry);

1685

2094

}

1686

2095

free(direntries);

1687

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

2096

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

1688

2097

perror_plus("close");

1689

2098

} else {

1690

2099

hookdir_fd = -1;

1693

2102

}

1694

2103

1695

2104

__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;

2105

int bring_up_interface(const char *const interface,

2106

const float delay){

2107

int old_errno = errno;

1699

2108

int ret;

1700

2109

struct ifreq network;

1701

2110

unsigned int if_index = if_nametoindex(interface);

1711

2120

}

1712

2121

1713

2122

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

2123

int ret_errno = 0;

2124

int ioctl_errno = 0;

1715

2125

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

1716

2126

ret_errno = errno;

1717

2127

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

1730

2140

}

1731

2141

1732

2142

if(quit_now){

1733

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

2143

ret = close(sd);

1734

2144

if(ret == -1){

1735

2145

perror_plus("close");

1736

2146

}

1786

2196

}

1787

2197

1788

2198

/* Close the socket */

1789

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

2199

ret = close(sd);

1790

2200

if(ret == -1){

1791

2201

perror_plus("close");

1792

2202

}

1804

2214

1805

2215

/* Sleep checking until interface is running.

1806

2216

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

1807

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

2217

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

1808

2218

if(interface_is_running(interface)){

1809

2219

break;

1810

2220

}

1820

2230

}

1821

2231

1822

2232

__attribute__((nonnull, warn_unused_result))

1823

error_t take_down_interface(const char *const interface){

1824

error_t old_errno = errno;

2233

int take_down_interface(const char *const interface){

2234

int old_errno = errno;

1825

2235

struct ifreq network;

1826

2236

unsigned int if_index = if_nametoindex(interface);

1827

2237

if(if_index == 0){

1830

2240

return ENXIO;

1831

2241

}

1832

2242

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

2243

int ret_errno = 0;

2244

int ioctl_errno = 0;

1834

2245

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

1835

2246

ret_errno = errno;

1836

2247

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

1874

2285

}

1875

2286

1876

2287

/* Close the socket */

1877

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

2288

int ret = close(sd);

1878

2289

if(ret == -1){

1879

2290

perror_plus("close");

1880

2291

}

1895

2306

}

1896

2307

1897

2308

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 };

2309

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

2310

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

2311

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

2312

.current_server = NULL, .interfaces = NULL,

2313

.interfaces_size = 0 };

1902

2314

AvahiSServiceBrowser *sb = NULL;

1903

2315

error_t ret_errno;

1904

2316

int ret;

1913

2325

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1914

2326

const char *seckey = PATHDIR "/" SECKEY;

1915

2327

const char *pubkey = PATHDIR "/" PUBKEY;

2328

const char *dh_params_file = NULL;

1916

2329

char *interfaces_hooks = NULL;

1917

2330

1918

2331

bool gnutls_initialized = false;

1971

2384

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

1972

2385

" Diffie-Hellman key exchange",

1973

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 },

1974

2392

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

1975

2393

.arg = "STRING",

1976

2394

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

2031

2449

}

2032

2450

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

2033

2451

break;

2452

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

2453

dh_params_file = arg;

2454

break;

2034

2455

case 130: /* --priority */

2035

2456

mc.priority = arg;

2036

2457

break;

2076

2497

.args_doc = "",

2077

2498

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

2078

2499

" passwords from a Mandos server" };

2079

ret = argp_parse(&argp, argc, argv,

2080

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2081

switch(ret){

2500

ret_errno = argp_parse(&argp, argc, argv,

2501

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2502

switch(ret_errno){

2082

2503

case 0:

2083

2504

break;

2084

2505

case ENOMEM:

2085

2506

default:

2086

errno = ret;

2507

errno = ret_errno;

2087

2508

perror_plus("argp_parse");

2088

2509

exitcode = EX_OSERR;

2089

2510

goto end;

2092

2513

goto end;

2093

2514

}

2094

2515

}

2095

2516

2096

2517

{

2097

2518

/* Work around Debian bug #633582:

2098

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

2519

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

2099

2520

2100

2521

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2522

ret = raise_privileges();

2523

if(ret != 0){

2524

errno = ret;

2104

2525

perror_plus("Failed to raise privileges");

2105

2526

} else {

2106

2527

struct stat st;

2122

2543

}

2123

2544

}

2124

2545

}

2125

TEMP_FAILURE_RETRY(close(seckey_fd));

2546

close(seckey_fd);

2126

2547

}

2127

2548

}

2128

2549

2129

2550

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

2130

2551

int pubkey_fd = open(pubkey, O_RDONLY);

2131

2552

if(pubkey_fd == -1){

2143

2564

}

2144

2565

}

2145

2566

}

2146

TEMP_FAILURE_RETRY(close(pubkey_fd));

2147

}

2148

}

2149

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

2150

2593

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2594

ret = lower_privileges();

2595

if(ret != 0){

2596

errno = ret;

2154

2597

perror_plus("Failed to lower privileges");

2155

2598

}

2156

2599

}

2326

2769

errno = bring_up_interface(interface, delay);

2327

2770

if(not interface_was_up){

2328

2771

if(errno != 0){

2329

perror_plus("Failed to bring up interface");

2772

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

2773

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

2330

2774

} else {

2331

2775

errno = argz_add(&interfaces_to_take_down,

2332

2776

&interfaces_to_take_down_size,

2355

2799

goto end;

2356

2800

}

2357

2801

2358

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

2802

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

2359

2803

if(ret == -1){

2360

2804

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

2361

2805

exitcode = EX_UNAVAILABLE;

2483

2927

2484

2928

/* Allocate a new server */

2485

2929

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

2930

&config, NULL, NULL, &ret);

2487

2931

2488

2932

/* Free the Avahi configuration data */

2489

2933

avahi_server_config_free(&config);

2492

2936

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

2493

2937

if(mc.server == NULL){

2494

2938

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

2495

avahi_strerror(ret_errno));

2939

avahi_strerror(ret));

2496

2940

exitcode = EX_UNAVAILABLE;

2497

2941

goto end;

2498

2942

}

2533

2977

end:

2534

2978

2535

2979

if(debug){

2536

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

}

2537

2987

}

2538

2988

2539

2989

/* Cleanup things */

2550

3000

2551

3001

if(gnutls_initialized){

2552

3002

gnutls_certificate_free_credentials(mc.cred);

2553

gnutls_global_deinit();

2554

3003

gnutls_dh_params_deinit(mc.dh_params);

2555

3004

}

2556

3005

2579

3028

2580

3029

/* Re-raise privileges */

2581

3030

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

3031

ret = raise_privileges();

3032

if(ret != 0){

3033

errno = ret;

2585

3034

perror_plus("Failed to raise privileges");

2586

3035

} else {

2587

3036

2592

3041

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

2593

3042

{

2594

3043

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;

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;

2601

3050

perror_plus("Failed to take down interface");

2602

3051

}

2603

3052

}

2608

3057

}

2609

3058

}

2610

3059

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

3060

ret = lower_privileges_permanently();

3061

if(ret != 0){

3062

errno = ret;

2614

3063

perror_plus("Failed to lower privileges permanently");

2615

3064

}

2616

3065

}

2618

3067

free(interfaces_to_take_down);

2619

3068

free(interfaces_hooks);

2620

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

2621

3124

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

2622

3125

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

}

3126

clean_dir_at(-1, tempdir, 0);

2664

3127

}

2665

3128

2666

3129

if(quit_now){