/mandos/trunk : revision 237.4.97

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,

234

240

.af = af };

235

241

if(new_server->ip == NULL){

236

242

perror_plus("strdup");

243

free(new_server);

237

244

return false;

238

245

}

239

246

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

240

247

if(ret == -1){

241

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

free((char *)(new_server->ip));

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

242

258

return false;

243

259

}

244

260

/* Special case of first server */

295

311

return false;

296

312

}

297

313

298

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

314

ret = close(fd);

299

315

if(ret == -1){

300

316

perror_plus("close");

301

317

}

483

499

return plaintext_length;

484

500

}

485

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

486

509

__attribute__((warn_unused_result))

487

510

static const char *safer_gnutls_strerror(int value){

488

511

const char *ret = gnutls_strerror(value);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

512

return safe_string(ret);

492

513

}

493

514

494

515

/* GnuTLS log function callback */

498

519

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

499

520

}

500

521

501

__attribute__((nonnull, warn_unused_result))

522

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

502

523

static int init_gnutls_global(const char *pubkeyfilename,

503

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

504

526

mandos_context *mc){

505

527

int ret;

528

unsigned int uret;

506

529

507

530

if(debug){

508

531

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

509

532

}

510

533

511

ret = gnutls_global_init();

512

if(ret != GNUTLS_E_SUCCESS){

513

fprintf_plus(stderr, "GnuTLS global_init: %s\n",

514

safer_gnutls_strerror(ret));

515

return -1;

516

}

517

518

534

if(debug){

519

535

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

520

536

* - GnuTLS manual

528

544

if(ret != GNUTLS_E_SUCCESS){

529

545

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

530

546

safer_gnutls_strerror(ret));

531

gnutls_global_deinit();

532

547

return -1;

533

548

}

534

549

559

574

safer_gnutls_strerror(ret));

560

575

goto globalfail;

561

576

}

562

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

563

if(ret != GNUTLS_E_SUCCESS){

564

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

565

safer_gnutls_strerror(ret));

566

goto globalfail;

567

}

568

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

ret = close(dhpfile);

617

if(ret == -1){

618

perror_plus("close");

619

}

620

if(params.data == NULL){

621

dhparamsfilename = NULL;

622

}

623

if(dhparamsfilename == NULL){

624

break;

625

}

626

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

627

GNUTLS_X509_FMT_PEM);

628

if(ret != GNUTLS_E_SUCCESS){

629

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

630

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

631

safer_gnutls_strerror(ret));

632

dhparamsfilename = NULL;

633

}

634

free(params.data);

635

} while(false);

636

}

637

if(dhparamsfilename == NULL){

638

if(mc->dh_bits == 0){

639

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

640

/* Try to read the private key file */

641

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

642

do {

643

int secfile = open(seckeyfilename, O_RDONLY);

644

if(secfile == -1){

645

perror_plus("open");

646

break;

647

}

648

size_t buffer_capacity = 0;

649

while(true){

650

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

651

(size_t)buffer.size,

652

(size_t)buffer_capacity);

653

if(buffer_capacity == 0){

654

perror_plus("incbuffer");

655

free(buffer.data);

656

buffer.data = NULL;

657

break;

658

}

659

ssize_t bytes_read = read(secfile,

660

buffer.data + buffer.size,

661

BUFFER_SIZE);

662

/* EOF */

663

if(bytes_read == 0){

664

break;

665

}

666

/* check bytes_read for failure */

667

if(bytes_read < 0){

668

perror_plus("read");

669

free(buffer.data);

670

buffer.data = NULL;

671

break;

672

}

673

buffer.size += (unsigned int)bytes_read;

674

}

675

close(secfile);

676

} while(false);

677

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

678

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

679

if(buffer.data != NULL){

680

{

681

gnutls_openpgp_privkey_t privkey = NULL;

682

ret = gnutls_openpgp_privkey_init(&privkey);

683

if(ret != GNUTLS_E_SUCCESS){

684

fprintf_plus(stderr, "Error initializing OpenPGP key"

685

" structure: %s",

686

safer_gnutls_strerror(ret));

687

free(buffer.data);

688

buffer.data = NULL;

689

} else {

690

ret = gnutls_openpgp_privkey_import

691

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

692

if(ret != GNUTLS_E_SUCCESS){

693

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

694

safer_gnutls_strerror(ret));

695

privkey = NULL;

696

}

697

free(buffer.data);

698

buffer.data = NULL;

699

if(privkey != NULL){

700

/* Use private key to suggest an appropriate

701

sec_param */

702

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

703

gnutls_openpgp_privkey_deinit(privkey);

704

if(debug){

705

fprintf_plus(stderr, "This OpenPGP key implies using"

706

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

707

safe_string(gnutls_sec_param_get_name

708

(sec_param)));

709

}

710

}

711

}

712

}

713

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

714

/* Err on the side of caution */

715

sec_param = GNUTLS_SEC_PARAM_ULTRA;

716

if(debug){

717

fprintf_plus(stderr, "Falling back to security parameter"

718

" \"%s\"\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)));

721

}

722

}

723

}

724

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

725

if(uret != 0){

726

mc->dh_bits = uret;

727

if(debug){

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

mc->dh_bits);

733

}

734

} else {

735

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

736

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

737

safe_string(gnutls_sec_param_get_name

738

(sec_param)),

739

safer_gnutls_strerror(ret));

740

goto globalfail;

741

}

742

} else if(debug){

743

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

744

mc->dh_bits);

745

}

746

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

747

if(ret != GNUTLS_E_SUCCESS){

748

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

749

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

750

safer_gnutls_strerror(ret));

751

goto globalfail;

752

}

753

}

569

754

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

570

755

571

756

return 0;

573

758

globalfail:

574

759

575

760

gnutls_certificate_free_credentials(mc->cred);

576

gnutls_global_deinit();

577

761

gnutls_dh_params_deinit(mc->dh_params);

578

762

return -1;

579

763

}

631

815

/* ignore client certificate if any. */

632

816

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

817

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

635

636

818

return 0;

637

819

}

638

820

640

822

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

641

823

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

642

824

825

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

826

__attribute__((warn_unused_result))

827

int raise_privileges(void){

828

int old_errno = errno;

829

int ret = 0;

830

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

831

ret = errno;

832

}

833

errno = old_errno;

834

return ret;

835

}

836

837

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

838

__attribute__((warn_unused_result))

839

int raise_privileges_permanently(void){

840

int old_errno = errno;

841

int ret = raise_privileges();

842

if(ret != 0){

843

errno = old_errno;

844

return ret;

845

}

846

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

847

ret = errno;

848

}

849

errno = old_errno;

850

return ret;

851

}

852

853

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

854

__attribute__((warn_unused_result))

855

int lower_privileges(void){

856

int old_errno = errno;

857

int ret = 0;

858

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

859

ret = errno;

860

}

861

errno = old_errno;

862

return ret;

863

}

864

865

/* Lower privileges permanently */

866

__attribute__((warn_unused_result))

867

int lower_privileges_permanently(void){

868

int old_errno = errno;

869

int ret = 0;

870

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

871

ret = errno;

872

}

873

errno = old_errno;

874

return ret;

875

}

876

877

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

878

__attribute__((nonnull, warn_unused_result))

879

static bool add_delete_local_route(const bool add,

880

const char *address,

881

AvahiIfIndex if_index){

882

int ret;

883

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

884

char add_arg[] = "add";

885

char delete_arg[] = "delete";

886

char debug_flag[] = "--debug";

887

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

888

if(pluginhelperdir == NULL){

889

if(debug){

890

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

891

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

892

}

893

return false;

894

}

895

896

char interface[IF_NAMESIZE];

897

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

898

perror_plus("if_indextoname");

899

return false;

900

}

901

902

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

903

if(devnull == -1){

904

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

905

return false;

906

}

907

pid_t pid = fork();

908

if(pid == 0){

909

/* Child */

910

/* Raise privileges */

911

errno = raise_privileges_permanently();

912

if(errno != 0){

913

perror_plus("Failed to raise privileges");

914

/* _exit(EX_NOPERM); */

915

} else {

916

/* Set group */

917

errno = 0;

918

ret = setgid(0);

919

if(ret == -1){

920

perror_plus("setgid");

921

_exit(EX_NOPERM);

922

}

923

/* Reset supplementary groups */

924

errno = 0;

925

ret = setgroups(0, NULL);

926

if(ret == -1){

927

perror_plus("setgroups");

928

_exit(EX_NOPERM);

929

}

930

}

931

ret = dup2(devnull, STDIN_FILENO);

932

if(ret == -1){

933

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

934

_exit(EX_OSERR);

935

}

936

ret = close(devnull);

937

if(ret == -1){

938

perror_plus("close");

939

_exit(EX_OSERR);

940

}

941

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

942

if(ret == -1){

943

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

944

_exit(EX_OSERR);

945

}

946

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

947

O_RDONLY

948

| O_DIRECTORY

949

| O_PATH

950

| O_CLOEXEC));

951

if(helperdir_fd == -1){

952

perror_plus("open");

953

_exit(EX_UNAVAILABLE);

954

}

955

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

956

helper, O_RDONLY));

957

if(helper_fd == -1){

958

perror_plus("openat");

959

close(helperdir_fd);

960

_exit(EX_UNAVAILABLE);

961

}

962

close(helperdir_fd);

963

#ifdef __GNUC__

964

#pragma GCC diagnostic push

965

#pragma GCC diagnostic ignored "-Wcast-qual"

966

#endif

967

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

968

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

969

interface, debug ? debug_flag : NULL, NULL },

970

environ) == -1){

971

#ifdef __GNUC__

972

#pragma GCC diagnostic pop

973

#endif

974

perror_plus("fexecve");

975

_exit(EXIT_FAILURE);

976

}

977

}

978

if(pid == -1){

979

perror_plus("fork");

980

return false;

981

}

982

int status;

983

pid_t pret = -1;

984

errno = 0;

985

do {

986

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

987

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

988

int errno_raising = 0;

989

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

990

errno_raising = errno;

991

perror_plus("Failed to raise privileges in order to"

992

" kill helper program");

993

}

994

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

995

perror_plus("kill");

996

}

997

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

998

perror_plus("Failed to lower privileges after killing"

999

" helper program");

1000

}

1001

return false;

1002

}

1003

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

1004

if(pret == -1){

1005

perror_plus("waitpid");

1006

return false;

1007

}

1008

if(WIFEXITED(status)){

1009

if(WEXITSTATUS(status) != 0){

1010

fprintf_plus(stderr, "Error: iprouteadddel exited"

1011

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

1012

return false;

1013

}

1014

return true;

1015

}

1016

if(WIFSIGNALED(status)){

1017

fprintf_plus(stderr, "Error: iprouteadddel died by"

1018

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

1019

return false;

1020

}

1021

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

1022

return false;

1023

}

1024

1025

__attribute__((nonnull, warn_unused_result))

1026

static bool add_local_route(const char *address,

1027

AvahiIfIndex if_index){

1028

if(debug){

1029

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

1030

}

1031

return add_delete_local_route(true, address, if_index);

1032

}

1033

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool delete_local_route(const char *address,

1036

AvahiIfIndex if_index){

1037

if(debug){

1038

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

1039

}

1040

return add_delete_local_route(false, address, if_index);

1041

}

1042

643

1043

/* Called when a Mandos server is found */

644

1044

__attribute__((nonnull, warn_unused_result))

645

1045

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

656

1056

int retval = -1;

657

1057

gnutls_session_t session;

658

1058

int pf; /* Protocol family */

1059

bool route_added = false;

659

1060

660

1061

errno = 0;

661

1062

683

1084

bool match = false;

684

1085

{

685

1086

char *interface = NULL;

686

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

687

interface))){

1087

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

1088

mc->interfaces_size,

1089

interface))){

688

1090

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

689

1091

match = true;

690

1092

break;

719

1121

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

720

1122

}

721

1123

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

1124

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

723

1125

if(tcp_sd < 0){

724

1126

int e = errno;

725

1127

perror_plus("socket");

732

1134

goto mandos_end;

733

1135

}

734

1136

735

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

736

1137

if(af == AF_INET6){

737

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

738

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

1138

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

1139

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

1140

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

739

1141

} else { /* IPv4 */

740

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

741

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

1142

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

1143

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

1144

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

742

1145

}

743

1146

if(ret < 0 ){

744

1147

int e = errno;

814

1217

goto mandos_end;

815

1218

}

816

1219

817

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

820

} else {

821

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

822

sizeof(struct sockaddr_in));

823

}

824

if(ret < 0){

825

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

826

int e = errno;

827

perror_plus("connect");

828

errno = e;

829

}

830

goto mandos_end;

831

}

832

833

if(quit_now){

834

errno = EINTR;

835

goto mandos_end;

1220

while(true){

1221

if(af == AF_INET6){

1222

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

1223

sizeof(struct sockaddr_in6));

1224

} else {

1225

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

1226

sizeof(struct sockaddr_in));

1227

}

1228

if(ret < 0){

1229

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

1230

and if_index != AVAHI_IF_UNSPEC

1231

and connect_to == NULL

1232

and not route_added and

1233

((af == AF_INET6 and not

1234

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1235

&to)->sin6_addr)))

1236

or (af == AF_INET and

1237

/* Not a a IPv4LL address */

1238

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

1239

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

1240

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

1241

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

1242

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

1243

connect to a Mandos server announced by Avahi on a server

1244

host with a global address. Work around this by retrying

1245

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

1246

1247

Avahi bug reference:

1248

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

1249

https://bugs.debian.org/587961

1250

*/

1251

if(debug){

1252

fprintf_plus(stderr, "Mandos server unreachable, trying"

1253

" direct route\n");

1254

}

1255

int e = errno;

1256

route_added = add_local_route(ip, if_index);

1257

if(route_added){

1258

continue;

1259

}

1260

errno = e;

1261

}

1262

if(errno != ECONNREFUSED or debug){

1263

int e = errno;

1264

perror_plus("connect");

1265

errno = e;

1266

}

1267

goto mandos_end;

1268

}

1269

1270

if(quit_now){

1271

errno = EINTR;

1272

goto mandos_end;

1273

}

1274

break;

836

1275

}

837

1276

838

1277

const char *out = mandos_protocol_version;

992

1431

&decrypted_buffer, mc);

993

1432

if(decrypted_buffer_size >= 0){

994

1433

1434

clearerr(stdout);

995

1435

written = 0;

996

1436

while(written < (size_t) decrypted_buffer_size){

997

1437

if(quit_now){

1013

1453

}

1014

1454

written += (size_t)ret;

1015

1455

}

1456

ret = fflush(stdout);

1457

if(ret != 0){

1458

int e = errno;

1459

if(debug){

1460

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

1461

strerror(errno));

1462

}

1463

errno = e;

1464

goto mandos_end;

1465

}

1016

1466

retval = 0;

1017

1467

}

1018

1468

}

1021

1471

1022

1472

mandos_end:

1023

1473

{

1474

if(route_added){

1475

if(not delete_local_route(ip, if_index)){

1476

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

1477

" interface %d", ip, if_index);

1478

}

1479

}

1024

1480

int e = errno;

1025

1481

free(decrypted_buffer);

1026

1482

free(buffer);

1027

1483

if(tcp_sd >= 0){

1028

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

1484

ret = close(tcp_sd);

1029

1485

}

1030

1486

if(ret == -1){

1031

1487

if(e == 0){

1043

1499

return retval;

1044

1500

}

1045

1501

1046

__attribute__((nonnull))

1047

1502

static void resolve_callback(AvahiSServiceResolver *r,

1048

1503

AvahiIfIndex interface,

1049

1504

AvahiProtocol proto,

1066

1521

timed out */

1067

1522

1068

1523

if(quit_now){

1524

avahi_s_service_resolver_free(r);

1069

1525

return;

1070

1526

}

1071

1527

1185

1641

__attribute__((nonnull, warn_unused_result))

1186

1642

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

1187

1643

int ret;

1188

error_t ret_errno;

1644

int old_errno;

1189

1645

1190

1646

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

1191

1647

if(s < 0){

1192

ret_errno = errno;

1648

old_errno = errno;

1193

1649

perror_plus("socket");

1194

errno = ret_errno;

1650

errno = old_errno;

1195

1651

return false;

1196

1652

}

1197

strcpy(ifr->ifr_name, ifname);

1653

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

1654

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

1198

1655

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1656

if(ret == -1){

1200

1657

if(debug){

1201

ret_errno = errno;

1658

old_errno = errno;

1202

1659

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1660

errno = old_errno;

1661

}

1662

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

1663

old_errno = errno;

1664

perror_plus("close");

1665

errno = old_errno;

1204

1666

}

1205

1667

return false;

1206

1668

}

1669

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

1670

old_errno = errno;

1671

perror_plus("close");

1672

errno = old_errno;

1673

}

1207

1674

return true;

1208

1675

}

1209

1676

1451

1918

}

1452

1919

}

1453

1920

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

1921

__attribute__((nonnull))

1511

1922

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

1512

1923

const float delay){

1513

struct dirent **direntries;

1924

struct dirent **direntries = NULL;

1514

1925

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1926

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1927

| O_CLOEXEC);

1516

1928

if(hookdir_fd == -1){

1517

1929

if(errno == ENOENT){

1518

1930

if(debug){

1525

1937

return;

1526

1938

}

1527

1939

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1940

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

1941

if(devnull == -1){

1942

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

1943

return;

1944

}

1530

1945

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

1531

1946

runnable_hook, alphasort);

1532

#else /* not __GLIBC_PREREQ(2, 15) */

1533

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1534

alphasort);

1535

#endif /* not __GLIBC_PREREQ(2, 15) */

1536

#else /* not __GLIBC__ */

1537

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1540

1947

if(numhooks == -1){

1541

1948

perror_plus("scandir");

1949

close(devnull);

1542

1950

return;

1543

1951

}

1544

1952

struct dirent *direntry;

1545

1953

int ret;

1546

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

1547

1954

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

1548

1955

direntry = direntries[i];

1549

1956

if(debug){

1554

1961

if(hook_pid == 0){

1555

1962

/* Child */

1556

1963

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1964

errno = raise_privileges_permanently();

1965

if(errno != 0){

1558

1966

perror_plus("Failed to raise privileges");

1559

1967

_exit(EX_NOPERM);

1560

1968

}

1572

1980

perror_plus("setgroups");

1573

1981

_exit(EX_NOPERM);

1574

1982

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

1983

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

1591

1984

if(ret == -1){

1592

1985

perror_plus("setenv");

1627

2020

_exit(EX_OSERR);

1628

2021

}

1629

2022

}

1630

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

2023

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

2024

direntry->d_name,

2025

O_RDONLY));

1631

2026

if(hook_fd == -1){

1632

2027

perror_plus("openat");

1633

2028

_exit(EXIT_FAILURE);

1634

2029

}

1635

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

2030

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

1636

2031

perror_plus("close");

1637

2032

_exit(EXIT_FAILURE);

1638

2033

}

2034

ret = dup2(devnull, STDIN_FILENO);

2035

if(ret == -1){

2036

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

2037

_exit(EX_OSERR);

2038

}

2039

ret = close(devnull);

2040

if(ret == -1){

2041

perror_plus("close");

2042

_exit(EX_OSERR);

2043

}

2044

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2045

if(ret == -1){

2046

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

2047

_exit(EX_OSERR);

2048

}

1639

2049

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

1640

2050

environ) == -1){

1641

2051

perror_plus("fexecve");

1642

2052

_exit(EXIT_FAILURE);

1643

2053

}

1644

2054

} else {

2055

if(hook_pid == -1){

2056

perror_plus("fork");

2057

free(direntry);

2058

continue;

2059

}

1645

2060

int status;

1646

2061

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

1647

2062

perror_plus("waitpid");

2063

free(direntry);

1648

2064

continue;

1649

2065

}

1650

2066

if(WIFEXITED(status)){

1652

2068

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1653

2069

" with status %d\n", direntry->d_name,

1654

2070

WEXITSTATUS(status));

2071

free(direntry);

1655

2072

continue;

1656

2073

}

1657

2074

} else if(WIFSIGNALED(status)){

1658

2075

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1659

2076

" signal %d\n", direntry->d_name,

1660

2077

WTERMSIG(status));

2078

free(direntry);

1661

2079

continue;

1662

2080

} else {

1663

2081

fprintf_plus(stderr, "Warning: network hook \"%s\""

1664

2082

" crashed\n", direntry->d_name);

2083

free(direntry);

1665

2084

continue;

1666

2085

}

1667

2086

}

1669

2088

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1670

2089

direntry->d_name);

1671

2090

}

2091

free(direntry);

1672

2092

}

1673

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

2093

free(direntries);

2094

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

1674

2095

perror_plus("close");

1675

2096

} else {

1676

2097

hookdir_fd = -1;

1679

2100

}

1680

2101

1681

2102

__attribute__((nonnull, warn_unused_result))

1682

error_t bring_up_interface(const char *const interface,

1683

const float delay){

1684

error_t old_errno = errno;

2103

int bring_up_interface(const char *const interface,

2104

const float delay){

2105

int old_errno = errno;

1685

2106

int ret;

1686

2107

struct ifreq network;

1687

2108

unsigned int if_index = if_nametoindex(interface);

1697

2118

}

1698

2119

1699

2120

if(not interface_is_up(interface)){

1700

error_t ret_errno = 0, ioctl_errno = 0;

2121

int ret_errno = 0;

2122

int ioctl_errno = 0;

1701

2123

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

1702

2124

ret_errno = errno;

1703

2125

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

1716

2138

}

1717

2139

1718

2140

if(quit_now){

1719

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

2141

ret = close(sd);

1720

2142

if(ret == -1){

1721

2143

perror_plus("close");

1722

2144

}

1732

2154

/* Raise privileges */

1733

2155

ret_errno = raise_privileges();

1734

2156

if(ret_errno != 0){

2157

errno = ret_errno;

1735

2158

perror_plus("Failed to raise privileges");

1736

2159

}

1737

2160

1771

2194

}

1772

2195

1773

2196

/* Close the socket */

1774

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

2197

ret = close(sd);

1775

2198

if(ret == -1){

1776

2199

perror_plus("close");

1777

2200

}

1789

2212

1790

2213

/* Sleep checking until interface is running.

1791

2214

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

1792

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

2215

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

1793

2216

if(interface_is_running(interface)){

1794

2217

break;

1795

2218

}

1805

2228

}

1806

2229

1807

2230

__attribute__((nonnull, warn_unused_result))

1808

error_t take_down_interface(const char *const interface){

1809

error_t old_errno = errno;

2231

int take_down_interface(const char *const interface){

2232

int old_errno = errno;

1810

2233

struct ifreq network;

1811

2234

unsigned int if_index = if_nametoindex(interface);

1812

2235

if(if_index == 0){

1815

2238

return ENXIO;

1816

2239

}

1817

2240

if(interface_is_up(interface)){

1818

error_t ret_errno = 0, ioctl_errno = 0;

2241

int ret_errno = 0;

2242

int ioctl_errno = 0;

1819

2243

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

1820

2244

ret_errno = errno;

1821

2245

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

1841

2265

/* Raise privileges */

1842

2266

ret_errno = raise_privileges();

1843

2267

if(ret_errno != 0){

2268

errno = ret_errno;

1844

2269

perror_plus("Failed to raise privileges");

1845

2270

}

1846

2271

1858

2283

}

1859

2284

1860

2285

/* Close the socket */

1861

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

2286

int ret = close(sd);

1862

2287

if(ret == -1){

1863

2288

perror_plus("close");

1864

2289

}

1879

2304

}

1880

2305

1881

2306

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

1882

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1883

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

1884

"+CTYPE-OPENPGP", .current_server = NULL,

1885

.interfaces = NULL, .interfaces_size = 0 };

2307

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

2308

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

2309

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

2310

.current_server = NULL, .interfaces = NULL,

2311

.interfaces_size = 0 };

1886

2312

AvahiSServiceBrowser *sb = NULL;

1887

2313

error_t ret_errno;

1888

2314

int ret;

1897

2323

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1898

2324

const char *seckey = PATHDIR "/" SECKEY;

1899

2325

const char *pubkey = PATHDIR "/" PUBKEY;

2326

const char *dh_params_file = NULL;

1900

2327

char *interfaces_hooks = NULL;

1901

2328

1902

2329

bool gnutls_initialized = false;

1955

2382

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

1956

2383

" Diffie-Hellman key exchange",

1957

2384

.group = 2 },

2385

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

2386

.arg = "FILE",

2387

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

2388

" for the Diffie-Hellman key exchange",

2389

.group = 2 },

1958

2390

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

1959

2391

.arg = "STRING",

1960

2392

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

2015

2447

}

2016

2448

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

2017

2449

break;

2450

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

2451

dh_params_file = arg;

2452

break;

2018

2453

case 130: /* --priority */

2019

2454

mc.priority = arg;

2020

2455

break;

2060

2495

.args_doc = "",

2061

2496

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

2062

2497

" passwords from a Mandos server" };

2063

ret = argp_parse(&argp, argc, argv,

2064

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2065

switch(ret){

2498

ret_errno = argp_parse(&argp, argc, argv,

2499

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2500

switch(ret_errno){

2066

2501

case 0:

2067

2502

break;

2068

2503

case ENOMEM:

2069

2504

default:

2070

errno = ret;

2505

errno = ret_errno;

2071

2506

perror_plus("argp_parse");

2072

2507

exitcode = EX_OSERR;

2073

2508

goto end;

2076

2511

goto end;

2077

2512

}

2078

2513

}

2079

2514

2080

2515

{

2081

2516

/* Work around Debian bug #633582:

2082

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

2517

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

2083

2518

2084

2519

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2520

ret = raise_privileges();

2521

if(ret != 0){

2522

errno = ret;

2088

2523

perror_plus("Failed to raise privileges");

2089

2524

} else {

2090

2525

struct stat st;

2106

2541

}

2107

2542

}

2108

2543

}

2109

TEMP_FAILURE_RETRY(close(seckey_fd));

2544

close(seckey_fd);

2110

2545

}

2111

2546

}

2112

2547

2113

2548

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

2114

2549

int pubkey_fd = open(pubkey, O_RDONLY);

2115

2550

if(pubkey_fd == -1){

2127

2562

}

2128

2563

}

2129

2564

}

2130

TEMP_FAILURE_RETRY(close(pubkey_fd));

2131

}

2132

}

2133

2565

close(pubkey_fd);

2566

}

2567

}

2568

2569

if(dh_params_file != NULL

2570

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

2571

int dhparams_fd = open(dh_params_file, O_RDONLY);

2572

if(dhparams_fd == -1){

2573

perror_plus("open");

2574

} else {

2575

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

2576

if(ret == -1){

2577

perror_plus("fstat");

2578

} else {

2579

if(S_ISREG(st.st_mode)

2580

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

2581

ret = fchown(dhparams_fd, uid, gid);

2582

if(ret == -1){

2583

perror_plus("fchown");

2584

}

2585

}

2586

}

2587

close(dhparams_fd);

2588

}

2589

}

2590

2134

2591

/* Lower privileges */

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2592

ret = lower_privileges();

2593

if(ret != 0){

2594

errno = ret;

2138

2595

perror_plus("Failed to lower privileges");

2139

2596

}

2140

2597

}

2265

2722

if(ret_errno != 0){

2266

2723

errno = ret_errno;

2267

2724

perror_plus("argz_add");

2725

free(direntries[i]);

2268

2726

continue;

2269

2727

}

2270

2728

if(debug){

2271

2729

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2272

2730

direntries[i]->d_name);

2273

2731

}

2732

free(direntries[i]);

2274

2733

}

2275

2734

free(direntries);

2276

2735

} else {

2277

free(direntries);

2736

if(ret == 0){

2737

free(direntries);

2738

}

2278

2739

fprintf_plus(stderr, "Could not find a network interface\n");

2279

2740

exitcode = EXIT_FAILURE;

2280

2741

goto end;

2306

2767

errno = bring_up_interface(interface, delay);

2307

2768

if(not interface_was_up){

2308

2769

if(errno != 0){

2309

perror_plus("Failed to bring up interface");

2770

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

2771

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

2310

2772

} else {

2311

2773

errno = argz_add(&interfaces_to_take_down,

2312

2774

&interfaces_to_take_down_size,

2335

2797

goto end;

2336

2798

}

2337

2799

2338

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

2800

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

2339

2801

if(ret == -1){

2340

2802

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

2341

2803

exitcode = EX_UNAVAILABLE;

2463

2925

2464

2926

/* Allocate a new server */

2465

2927

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2466

&config, NULL, NULL, &ret_errno);

2928

&config, NULL, NULL, &ret);

2467

2929

2468

2930

/* Free the Avahi configuration data */

2469

2931

avahi_server_config_free(&config);

2472

2934

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

2473

2935

if(mc.server == NULL){

2474

2936

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

2475

avahi_strerror(ret_errno));

2937

avahi_strerror(ret));

2476

2938

exitcode = EX_UNAVAILABLE;

2477

2939

goto end;

2478

2940

}

2513

2975

end:

2514

2976

2515

2977

if(debug){

2516

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

2978

if(signal_received){

2979

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

2980

argv[0], signal_received,

2981

strsignal(signal_received));

2982

} else {

2983

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

2984

}

2517

2985

}

2518

2986

2519

2987

/* Cleanup things */

2530

2998

2531

2999

if(gnutls_initialized){

2532

3000

gnutls_certificate_free_credentials(mc.cred);

2533

gnutls_global_deinit();

2534

3001

gnutls_dh_params_deinit(mc.dh_params);

2535

3002

}

2536

3003

2544

3011

mc.current_server->prev->next = NULL;

2545

3012

while(mc.current_server != NULL){

2546

3013

server *next = mc.current_server->next;

3014

#ifdef __GNUC__

3015

#pragma GCC diagnostic push

3016

#pragma GCC diagnostic ignored "-Wcast-qual"

3017

#endif

3018

free((char *)(mc.current_server->ip));

3019

#ifdef __GNUC__

3020

#pragma GCC diagnostic pop

3021

#endif

2547

3022

free(mc.current_server);

2548

3023

mc.current_server = next;

2549

3024

}

2551

3026

2552

3027

/* Re-raise privileges */

2553

3028

{

2554

ret_errno = raise_privileges();

2555

if(ret_errno != 0){

3029

ret = raise_privileges();

3030

if(ret != 0){

3031

errno = ret;

2556

3032

perror_plus("Failed to raise privileges");

2557

3033

} else {

2558

3034

2563

3039

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

2564

3040

{

2565

3041

char *interface = NULL;

2566

while((interface=argz_next(interfaces_to_take_down,

2567

interfaces_to_take_down_size,

2568

interface))){

2569

ret_errno = take_down_interface(interface);

2570

if(ret_errno != 0){

2571

errno = ret_errno;

3042

while((interface = argz_next(interfaces_to_take_down,

3043

interfaces_to_take_down_size,

3044

interface))){

3045

ret = take_down_interface(interface);

3046

if(ret != 0){

3047

errno = ret;

2572

3048

perror_plus("Failed to take down interface");

2573

3049

}

2574

3050

}

2579

3055

}

2580

3056

}

2581

3057

2582

ret_errno = lower_privileges_permanently();

2583

if(ret_errno != 0){

3058

ret = lower_privileges_permanently();

3059

if(ret != 0){

3060

errno = ret;

2584

3061

perror_plus("Failed to lower privileges permanently");

2585

3062

}

2586

3063

}

2588

3065

free(interfaces_to_take_down);

2589

3066

free(interfaces_hooks);

2590

3067

3068

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

3069

uintmax_t level){

3070

struct dirent **direntries = NULL;

3071

int dret;

3072

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

3073

O_RDONLY

3074

| O_NOFOLLOW

3075

| O_DIRECTORY

3076

| O_PATH));

3077

if(dir_fd == -1){

3078

perror_plus("open");

3079

return;

3080

}

3081

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

3082

notdotentries, alphasort);

3083

if(numentries >= 0){

3084

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

3085

if(debug){

3086

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

3087

dirname, direntries[i]->d_name);

3088

}

3089

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

3090

if(dret == -1){

3091

if(errno == EISDIR){

3092

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

3093

AT_REMOVEDIR);

3094

}

3095

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

3096

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

3097

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

3098

/* Recurse only in this special case */

3099

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

3100

dret = 0;

3101

}

3102

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

3103

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

3104

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

3105

}

3106

}

3107

free(direntries[i]);

3108

}

3109

3110

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

3111

free(direntries);

3112

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3113

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

3114

perror_plus("rmdir");

3115

}

3116

} else {

3117

perror_plus("scandirat");

3118

}

3119

close(dir_fd);

3120

}

3121

2591

3122

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

2592

3123

if(tempdir != NULL){

2593

struct dirent **direntries = NULL;

2594

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2595

O_NOFOLLOW));

2596

if(tempdir_fd == -1){

2597

perror_plus("open");

2598

} else {

2599

#ifdef __GLIBC__

2600

#if __GLIBC_PREREQ(2, 15)

2601

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

2602

notdotentries, alphasort);

2603

#else /* not __GLIBC_PREREQ(2, 15) */

2604

int numentries = scandir(tempdir, &direntries, notdotentries,

2605

alphasort);

2606

#endif /* not __GLIBC_PREREQ(2, 15) */

2607

#else /* not __GLIBC__ */

2608

int numentries = scandir(tempdir, &direntries, notdotentries,

2609

alphasort);

2610

#endif /* not __GLIBC__ */

2611

if(numentries > 0){

2612

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

2613

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2614

if(ret == -1){

2615

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2616

" \"%s\", 0): %s\n", tempdir,

2617

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

2618

}

2619

}

2620

2621

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

2622

free(direntries);

2623

if(numentries == -1){

2624

perror_plus("scandir");

2625

}

2626

ret = rmdir(tempdir);

2627

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

2628

perror_plus("rmdir");

2629

}

2630

}

2631

TEMP_FAILURE_RETRY(close(tempdir_fd));

2632

}

3124

clean_dir_at(-1, tempdir, 0);

2633

3125

}

2634

3126

2635

3127

if(quit_now){