/mandos/trunk : revision 703

9

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

10

*

11

* Everything else is

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

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

23

21

* WITHOUT ANY WARRANTY; without even the implied warranty of

24

22

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

25

23

* General Public License for more details.

26

24

*

27

25

* You should have received a copy of the GNU General Public License

28

* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

29

28

*

30

29

* Contact the authors at <mandos@recompile.se>.

31

30

*/

47

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

48

47

strtof(), abort() */

49

48

#include <stdbool.h> /* bool, false, true */

50

#include <string.h> /* strcmp(), strlen(), strerror(),

51

asprintf(), strncpy(), strsignal()

52

*/

49

#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

53

51

#include <sys/ioctl.h> /* ioctl */

54

52

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

55

53

sockaddr_in6, PF_INET6,

59

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

60

58

inet_pton(), connect(),

61

59

getnameinfo() */

62

#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */

60

#include <fcntl.h> /* open(), unlinkat() */

63

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

64

62

*/

65

63

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

66

64

strtoimax() */

67

#include <errno.h> /* perror(), errno, EINTR, EINVAL,

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

65

#include <errno.h> /* perror(), errno,

72

66

program_invocation_short_name */

73

67

#include <time.h> /* nanosleep(), time(), sleep() */

74

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

240

234

.af = af };

241

235

if(new_server->ip == NULL){

242

236

perror_plus("strdup");

243

free(new_server);

244

237

return false;

245

238

}

246

239

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

247

240

if(ret == -1){

248

241

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);

258

242

return false;

259

243

}

260

244

/* Special case of first server */

311

295

return false;

312

296

}

313

297

314

ret = close(fd);

298

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

315

299

if(ret == -1){

316

300

perror_plus("close");

317

301

}

499

483

return plaintext_length;

500

484

}

501

485

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

509

486

__attribute__((warn_unused_result))

510

487

static const char *safer_gnutls_strerror(int value){

511

488

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

513

492

}

514

493

515

494

/* GnuTLS log function callback */

519

498

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

520

499

}

521

500

522

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

501

__attribute__((nonnull, warn_unused_result))

523

502

static int init_gnutls_global(const char *pubkeyfilename,

524

503

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

504

mandos_context *mc){

527

505

int ret;

528

unsigned int uret;

529

506

530

507

if(debug){

531

508

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

532

509

}

533

510

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

534

518

if(debug){

535

519

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

536

520

* - GnuTLS manual

544

528

if(ret != GNUTLS_E_SUCCESS){

545

529

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

546

530

safer_gnutls_strerror(ret));

531

gnutls_global_deinit();

547

532

return -1;

548

533

}

549

534

574

559

safer_gnutls_strerror(ret));

575

560

goto globalfail;

576

561

}

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

if(params.data == NULL){

617

dhparamsfilename = NULL;

618

}

619

if(dhparamsfilename == NULL){

620

break;

621

}

622

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

623

GNUTLS_X509_FMT_PEM);

624

if(ret != GNUTLS_E_SUCCESS){

625

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

626

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

627

safer_gnutls_strerror(ret));

628

dhparamsfilename = NULL;

629

}

630

free(params.data);

631

} while(false);

632

}

633

if(dhparamsfilename == NULL){

634

if(mc->dh_bits == 0){

635

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

636

/* Try to read the private key file */

637

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

638

do {

639

int secfile = open(seckeyfilename, O_RDONLY);

640

if(secfile == -1){

641

perror_plus("open");

642

break;

643

}

644

size_t buffer_capacity = 0;

645

while(true){

646

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

647

(size_t)buffer.size,

648

(size_t)buffer_capacity);

649

if(buffer_capacity == 0){

650

perror_plus("incbuffer");

651

free(buffer.data);

652

buffer.data = NULL;

653

break;

654

}

655

ssize_t bytes_read = read(secfile,

656

buffer.data + buffer.size,

657

BUFFER_SIZE);

658

/* EOF */

659

if(bytes_read == 0){

660

break;

661

}

662

/* check bytes_read for failure */

663

if(bytes_read < 0){

664

perror_plus("read");

665

free(buffer.data);

666

buffer.data = NULL;

667

break;

668

}

669

buffer.size += (unsigned int)bytes_read;

670

}

671

close(secfile);

672

} while(false);

673

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

674

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

675

if(buffer.data != NULL){

676

{

677

gnutls_openpgp_privkey_t privkey = NULL;

678

ret = gnutls_openpgp_privkey_init(&privkey);

679

if(ret != GNUTLS_E_SUCCESS){

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

682

safer_gnutls_strerror(ret));

683

free(buffer.data);

684

buffer.data = NULL;

685

} else {

686

ret = gnutls_openpgp_privkey_import

687

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

688

if(ret != GNUTLS_E_SUCCESS){

689

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

690

safer_gnutls_strerror(ret));

691

privkey = NULL;

692

}

693

free(buffer.data);

694

buffer.data = NULL;

695

if(privkey != NULL){

696

/* Use private key to suggest an appropriate

697

sec_param */

698

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

699

gnutls_openpgp_privkey_deinit(privkey);

700

if(debug){

701

fprintf_plus(stderr, "This OpenPGP key implies using"

702

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

703

safe_string(gnutls_sec_param_get_name

704

(sec_param)));

705

}

706

}

707

}

708

}

709

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

710

/* Err on the side of caution */

711

sec_param = GNUTLS_SEC_PARAM_ULTRA;

712

if(debug){

713

fprintf_plus(stderr, "Falling back to security parameter"

714

" \"%s\"\n",

715

safe_string(gnutls_sec_param_get_name

716

(sec_param)));

717

}

718

}

719

}

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

mc->dh_bits = uret;

723

if(debug){

724

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

725

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

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

mc->dh_bits);

729

}

730

} else {

731

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

732

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

733

safe_string(gnutls_sec_param_get_name

734

(sec_param)),

735

safer_gnutls_strerror(ret));

736

goto globalfail;

737

}

738

} else if(debug){

739

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

740

mc->dh_bits);

741

}

742

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

743

if(ret != GNUTLS_E_SUCCESS){

744

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

745

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

746

safer_gnutls_strerror(ret));

747

goto globalfail;

748

}

749

}

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

750

569

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

751

570

752

571

return 0;

754

573

globalfail:

755

574

756

575

gnutls_certificate_free_credentials(mc->cred);

576

gnutls_global_deinit();

757

577

gnutls_dh_params_deinit(mc->dh_params);

758

578

return -1;

759

579

}

811

631

/* ignore client certificate if any. */

812

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

813

633

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

635

814

636

return 0;

815

637

}

816

638

818

640

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

819

641

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

820

642

821

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

822

__attribute__((warn_unused_result))

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

826

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

827

ret = errno;

828

}

829

errno = old_errno;

830

return ret;

831

}

832

833

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

834

__attribute__((warn_unused_result))

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

if(ret != 0){

839

errno = old_errno;

840

return ret;

841

}

842

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

843

ret = errno;

844

}

845

errno = old_errno;

846

return ret;

847

}

848

849

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

850

__attribute__((warn_unused_result))

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

854

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

855

ret = errno;

856

}

857

errno = old_errno;

858

return ret;

859

}

860

861

/* Lower privileges permanently */

862

__attribute__((warn_unused_result))

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

866

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

867

ret = errno;

868

}

869

errno = old_errno;

870

return ret;

871

}

872

873

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

874

__attribute__((nonnull, warn_unused_result))

875

static bool add_delete_local_route(const bool add,

876

const char *address,

877

AvahiIfIndex if_index){

878

int ret;

879

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

880

char add_arg[] = "add";

881

char delete_arg[] = "delete";

882

char debug_flag[] = "--debug";

883

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

884

if(pluginhelperdir == NULL){

885

if(debug){

886

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

887

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

888

}

889

return false;

890

}

891

892

char interface[IF_NAMESIZE];

893

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

894

perror_plus("if_indextoname");

895

return false;

896

}

897

898

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

899

if(devnull == -1){

900

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

901

return false;

902

}

903

pid_t pid = fork();

904

if(pid == 0){

905

/* Child */

906

/* Raise privileges */

907

errno = raise_privileges_permanently();

908

if(errno != 0){

909

perror_plus("Failed to raise privileges");

910

/* _exit(EX_NOPERM); */

911

} else {

912

/* Set group */

913

errno = 0;

914

ret = setgid(0);

915

if(ret == -1){

916

perror_plus("setgid");

917

_exit(EX_NOPERM);

918

}

919

/* Reset supplementary groups */

920

errno = 0;

921

ret = setgroups(0, NULL);

922

if(ret == -1){

923

perror_plus("setgroups");

924

_exit(EX_NOPERM);

925

}

926

}

927

ret = dup2(devnull, STDIN_FILENO);

928

if(ret == -1){

929

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

930

_exit(EX_OSERR);

931

}

932

ret = close(devnull);

933

if(ret == -1){

934

perror_plus("close");

935

_exit(EX_OSERR);

936

}

937

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

938

if(ret == -1){

939

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

940

_exit(EX_OSERR);

941

}

942

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

943

O_RDONLY

944

| O_DIRECTORY

945

| O_PATH

946

| O_CLOEXEC));

947

if(helperdir_fd == -1){

948

perror_plus("open");

949

_exit(EX_UNAVAILABLE);

950

}

951

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

952

helper, O_RDONLY));

953

if(helper_fd == -1){

954

perror_plus("openat");

955

close(helperdir_fd);

956

_exit(EX_UNAVAILABLE);

957

}

958

close(helperdir_fd);

959

#ifdef __GNUC__

960

#pragma GCC diagnostic push

961

#pragma GCC diagnostic ignored "-Wcast-qual"

962

#endif

963

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

964

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

965

interface, debug ? debug_flag : NULL, NULL },

966

environ) == -1){

967

#ifdef __GNUC__

968

#pragma GCC diagnostic pop

969

#endif

970

perror_plus("fexecve");

971

_exit(EXIT_FAILURE);

972

}

973

}

974

if(pid == -1){

975

perror_plus("fork");

976

return false;

977

}

978

int status;

979

pid_t pret = -1;

980

errno = 0;

981

do {

982

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

983

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

984

int errno_raising = 0;

985

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

986

errno_raising = errno;

987

perror_plus("Failed to raise privileges in order to"

988

" kill helper program");

989

}

990

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

991

perror_plus("kill");

992

}

993

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

994

perror_plus("Failed to lower privileges after killing"

995

" helper program");

996

}

997

return false;

998

}

999

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

1000

if(pret == -1){

1001

perror_plus("waitpid");

1002

return false;

1003

}

1004

if(WIFEXITED(status)){

1005

if(WEXITSTATUS(status) != 0){

1006

fprintf_plus(stderr, "Error: iprouteadddel exited"

1007

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

1008

return false;

1009

}

1010

return true;

1011

}

1012

if(WIFSIGNALED(status)){

1013

fprintf_plus(stderr, "Error: iprouteadddel died by"

1014

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

1015

return false;

1016

}

1017

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

1018

return false;

1019

}

1020

1021

__attribute__((nonnull, warn_unused_result))

1022

static bool add_local_route(const char *address,

1023

AvahiIfIndex if_index){

1024

if(debug){

1025

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

1026

}

1027

return add_delete_local_route(true, address, if_index);

1028

}

1029

1030

__attribute__((nonnull, warn_unused_result))

1031

static bool delete_local_route(const char *address,

1032

AvahiIfIndex if_index){

1033

if(debug){

1034

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

1035

}

1036

return add_delete_local_route(false, address, if_index);

1037

}

1038

1039

643

/* Called when a Mandos server is found */

1040

644

__attribute__((nonnull, warn_unused_result))

1041

645

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

1052

656

int retval = -1;

1053

657

gnutls_session_t session;

1054

658

int pf; /* Protocol family */

1055

bool route_added = false;

1056

659

1057

660

errno = 0;

1058

661

1080

683

bool match = false;

1081

684

{

1082

685

char *interface = NULL;

1083

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

1084

mc->interfaces_size,

1085

interface))){

686

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

687

interface))){

1086

688

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

1087

689

match = true;

1088

690

break;

1117

719

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

1118

720

}

1119

721

1120

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

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

723

if(tcp_sd < 0){

1122

724

int e = errno;

1123

725

perror_plus("socket");

1130

732

goto mandos_end;

1131

733

}

1132

734

735

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

1133

736

if(af == AF_INET6){

1134

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

1135

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

1136

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

737

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

738

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

1137

739

} else { /* IPv4 */

1138

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

1139

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

1140

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

740

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

741

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

1141

742

}

1142

743

if(ret < 0 ){

1143

744

int e = errno;

1213

814

goto mandos_end;

1214

815

}

1215

816

1216

while(true){

1217

if(af == AF_INET6){

1218

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

1219

sizeof(struct sockaddr_in6));

1220

} else {

1221

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

1222

sizeof(struct sockaddr_in));

1223

}

1224

if(ret < 0){

1225

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

1226

and if_index != AVAHI_IF_UNSPEC

1227

and connect_to == NULL

1228

and not route_added and

1229

((af == AF_INET6 and not

1230

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1231

&to)->sin6_addr)))

1232

or (af == AF_INET and

1233

/* Not a a IPv4LL address */

1234

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

1235

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

1236

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

1237

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

1238

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

1239

connect to a Mandos server announced by Avahi on a server

1240

host with a global address. Work around this by retrying

1241

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

1242

1243

Avahi bug reference:

1244

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

1245

https://bugs.debian.org/587961

1246

*/

1247

if(debug){

1248

fprintf_plus(stderr, "Mandos server unreachable, trying"

1249

" direct route\n");

1250

}

1251

int e = errno;

1252

route_added = add_local_route(ip, if_index);

1253

if(route_added){

1254

continue;

1255

}

1256

errno = e;

1257

}

1258

if(errno != ECONNREFUSED or debug){

1259

int e = errno;

1260

perror_plus("connect");

1261

errno = e;

1262

}

1263

goto mandos_end;

1264

}

1265

1266

if(quit_now){

1267

errno = EINTR;

1268

goto mandos_end;

1269

}

1270

break;

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;

1271

836

}

1272

837

1273

838

const char *out = mandos_protocol_version;

1427

992

&decrypted_buffer, mc);

1428

993

if(decrypted_buffer_size >= 0){

1429

994

1430

clearerr(stdout);

1431

995

written = 0;

1432

996

while(written < (size_t) decrypted_buffer_size){

1433

997

if(quit_now){

1449

1013

}

1450

1014

written += (size_t)ret;

1451

1015

}

1452

ret = fflush(stdout);

1453

if(ret != 0){

1454

int e = errno;

1455

if(debug){

1456

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

1457

strerror(errno));

1458

}

1459

errno = e;

1460

goto mandos_end;

1461

}

1462

1016

retval = 0;

1463

1017

}

1464

1018

}

1467

1021

1468

1022

mandos_end:

1469

1023

{

1470

if(route_added){

1471

if(not delete_local_route(ip, if_index)){

1472

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

1473

" interface %d", ip, if_index);

1474

}

1475

}

1476

1024

int e = errno;

1477

1025

free(decrypted_buffer);

1478

1026

free(buffer);

1479

1027

if(tcp_sd >= 0){

1480

ret = close(tcp_sd);

1028

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

1481

1029

}

1482

1030

if(ret == -1){

1483

1031

if(e == 0){

1495

1043

return retval;

1496

1044

}

1497

1045

1046

__attribute__((nonnull))

1498

1047

static void resolve_callback(AvahiSServiceResolver *r,

1499

1048

AvahiIfIndex interface,

1500

1049

AvahiProtocol proto,

1517

1066

timed out */

1518

1067

1519

1068

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1521

1069

return;

1522

1070

}

1523

1071

1637

1185

__attribute__((nonnull, warn_unused_result))

1638

1186

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

1639

1187

int ret;

1640

int old_errno;

1188

error_t ret_errno;

1641

1189

1642

1190

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

1643

1191

if(s < 0){

1644

old_errno = errno;

1192

ret_errno = errno;

1645

1193

perror_plus("socket");

1646

errno = old_errno;

1194

errno = ret_errno;

1647

1195

return false;

1648

1196

}

1649

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

1650

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

1197

strcpy(ifr->ifr_name, ifname);

1651

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

1199

if(ret == -1){

1653

1200

if(debug){

1654

old_errno = errno;

1201

ret_errno = errno;

1655

1202

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1203

errno = ret_errno;

1657

1204

}

1658

1205

return false;

1659

1206

}

1904

1451

}

1905

1452

}

1906

1453

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

1907

1510

__attribute__((nonnull))

1908

1511

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

1909

1512

const float delay){

1910

struct dirent **direntries = NULL;

1513

struct dirent **direntries;

1911

1514

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1515

hookdir_fd = open(hookdir, O_RDONLY);

1914

1516

if(hookdir_fd == -1){

1915

1517

if(errno == ENOENT){

1916

1518

if(debug){

1923

1525

return;

1924

1526

}

1925

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1926

1530

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

1927

1531

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__ */

1928

1540

if(numhooks == -1){

1929

1541

perror_plus("scandir");

1930

1542

return;

1931

1543

}

1932

1544

struct dirent *direntry;

1933

1545

int ret;

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1546

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

1939

1547

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

1940

1548

direntry = direntries[i];

1941

1549

if(debug){

1946

1554

if(hook_pid == 0){

1947

1555

/* Child */

1948

1556

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1557

if(raise_privileges_permanently() != 0){

1951

1558

perror_plus("Failed to raise privileges");

1952

1559

_exit(EX_NOPERM);

1953

1560

}

1965

1572

perror_plus("setgroups");

1966

1573

_exit(EX_NOPERM);

1967

1574

}

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

}

1968

1590

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

1969

1591

if(ret == -1){

1970

1592

perror_plus("setenv");

2005

1627

_exit(EX_OSERR);

2006

1628

}

2007

1629

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

1630

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

2011

1631

if(hook_fd == -1){

2012

1632

perror_plus("openat");

2013

1633

_exit(EXIT_FAILURE);

2014

1634

}

2015

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

1635

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

2016

1636

perror_plus("close");

2017

1637

_exit(EXIT_FAILURE);

2018

1638

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

1639

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

2035

1640

environ) == -1){

2036

1641

perror_plus("fexecve");

2037

1642

_exit(EXIT_FAILURE);

2038

1643

}

2039

1644

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

1645

int status;

2046

1646

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

2047

1647

perror_plus("waitpid");

2048

free(direntry);

2049

1648

continue;

2050

1649

}

2051

1650

if(WIFEXITED(status)){

2053

1652

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

2054

1653

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

2055

1654

WEXITSTATUS(status));

2056

free(direntry);

2057

1655

continue;

2058

1656

}

2059

1657

} else if(WIFSIGNALED(status)){

2060

1658

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

2061

1659

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

2062

1660

WTERMSIG(status));

2063

free(direntry);

2064

1661

continue;

2065

1662

} else {

2066

1663

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

2067

1664

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

2068

free(direntry);

2069

1665

continue;

2070

1666

}

2071

1667

}

2073

1669

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

2074

1670

direntry->d_name);

2075

1671

}

2076

free(direntry);

2077

1672

}

2078

free(direntries);

2079

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

1673

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

2080

1674

perror_plus("close");

2081

1675

} else {

2082

1676

hookdir_fd = -1;

2085

1679

}

2086

1680

2087

1681

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

1682

error_t bring_up_interface(const char *const interface,

1683

const float delay){

1684

error_t old_errno = errno;

2091

1685

int ret;

2092

1686

struct ifreq network;

2093

1687

unsigned int if_index = if_nametoindex(interface);

2103

1697

}

2104

1698

2105

1699

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

1700

error_t ret_errno = 0, ioctl_errno = 0;

2108

1701

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

2109

1702

ret_errno = errno;

2110

1703

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

2123

1716

}

2124

1717

2125

1718

if(quit_now){

2126

ret = close(sd);

1719

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

2127

1720

if(ret == -1){

2128

1721

perror_plus("close");

2129

1722

}

2139

1732

/* Raise privileges */

2140

1733

ret_errno = raise_privileges();

2141

1734

if(ret_errno != 0){

2142

errno = ret_errno;

2143

1735

perror_plus("Failed to raise privileges");

2144

1736

}

2145

1737

2179

1771

}

2180

1772

2181

1773

/* Close the socket */

2182

ret = close(sd);

1774

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

2183

1775

if(ret == -1){

2184

1776

perror_plus("close");

2185

1777

}

2197

1789

2198

1790

/* Sleep checking until interface is running.

2199

1791

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

2200

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

1792

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

2201

1793

if(interface_is_running(interface)){

2202

1794

break;

2203

1795

}

2213

1805

}

2214

1806

2215

1807

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

1808

error_t take_down_interface(const char *const interface){

1809

error_t old_errno = errno;

2218

1810

struct ifreq network;

2219

1811

unsigned int if_index = if_nametoindex(interface);

2220

1812

if(if_index == 0){

2223

1815

return ENXIO;

2224

1816

}

2225

1817

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

1818

error_t ret_errno = 0, ioctl_errno = 0;

2228

1819

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

2229

1820

ret_errno = errno;

2230

1821

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

2250

1841

/* Raise privileges */

2251

1842

ret_errno = raise_privileges();

2252

1843

if(ret_errno != 0){

2253

errno = ret_errno;

2254

1844

perror_plus("Failed to raise privileges");

2255

1845

}

2256

1846

2268

1858

}

2269

1859

2270

1860

/* Close the socket */

2271

int ret = close(sd);

1861

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

2272

1862

if(ret == -1){

2273

1863

perror_plus("close");

2274

1864

}

2289

1879

}

2290

1880

2291

1881

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

2292

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

2293

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

2294

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

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

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 };

2297

1886

AvahiSServiceBrowser *sb = NULL;

2298

1887

error_t ret_errno;

2299

1888

int ret;

2308

1897

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2309

1898

const char *seckey = PATHDIR "/" SECKEY;

2310

1899

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

1900

char *interfaces_hooks = NULL;

2313

1901

2314

1902

bool gnutls_initialized = false;

2367

1955

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

2368

1956

" Diffie-Hellman key exchange",

2369

1957

.group = 2 },

2370

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

2371

.arg = "FILE",

2372

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

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

2375

1958

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

2376

1959

.arg = "STRING",

2377

1960

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

2432

2015

}

2433

2016

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

2434

2017

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2438

2018

case 130: /* --priority */

2439

2019

mc.priority = arg;

2440

2020

break;

2480

2060

.args_doc = "",

2481

2061

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

2482

2062

" passwords from a Mandos server" };

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

2063

ret = argp_parse(&argp, argc, argv,

2064

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2065

switch(ret){

2486

2066

case 0:

2487

2067

break;

2488

2068

case ENOMEM:

2489

2069

default:

2490

errno = ret_errno;

2070

errno = ret;

2491

2071

perror_plus("argp_parse");

2492

2072

exitcode = EX_OSERR;

2493

2073

goto end;

2496

2076

goto end;

2497

2077

}

2498

2078

}

2499

2079

2500

2080

{

2501

2081

/* Work around Debian bug #633582:

2502

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

2082

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

2503

2083

2504

2084

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2508

2088

perror_plus("Failed to raise privileges");

2509

2089

} else {

2510

2090

struct stat st;

2526

2106

}

2527

2107

}

2528

2108

}

2529

close(seckey_fd);

2109

TEMP_FAILURE_RETRY(close(seckey_fd));

2530

2110

}

2531

2111

}

2532

2112

2533

2113

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

2534

2114

int pubkey_fd = open(pubkey, O_RDONLY);

2535

2115

if(pubkey_fd == -1){

2547

2127

}

2548

2128

}

2549

2129

}

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

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

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2573

}

2574

}

2575

2130

TEMP_FAILURE_RETRY(close(pubkey_fd));

2131

}

2132

}

2133

2576

2134

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2580

2138

perror_plus("Failed to lower privileges");

2581

2139

}

2582

2140

}

2707

2265

if(ret_errno != 0){

2708

2266

errno = ret_errno;

2709

2267

perror_plus("argz_add");

2710

free(direntries[i]);

2711

2268

continue;

2712

2269

}

2713

2270

if(debug){

2714

2271

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

2715

2272

direntries[i]->d_name);

2716

2273

}

2717

free(direntries[i]);

2718

2274

}

2719

2275

free(direntries);

2720

2276

} else {

2721

if(ret == 0){

2722

free(direntries);

2723

}

2277

free(direntries);

2724

2278

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

2725

2279

exitcode = EXIT_FAILURE;

2726

2280

goto end;

2752

2306

errno = bring_up_interface(interface, delay);

2753

2307

if(not interface_was_up){

2754

2308

if(errno != 0){

2755

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

2756

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

2309

perror_plus("Failed to bring up interface");

2757

2310

} else {

2758

2311

errno = argz_add(&interfaces_to_take_down,

2759

2312

&interfaces_to_take_down_size,

2782

2335

goto end;

2783

2336

}

2784

2337

2785

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

2338

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

2786

2339

if(ret == -1){

2787

2340

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

2788

2341

exitcode = EX_UNAVAILABLE;

2910

2463

2911

2464

/* Allocate a new server */

2912

2465

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

2466

&config, NULL, NULL, &ret_errno);

2914

2467

2915

2468

/* Free the Avahi configuration data */

2916

2469

avahi_server_config_free(&config);

2919

2472

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

2920

2473

if(mc.server == NULL){

2921

2474

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

2922

avahi_strerror(ret));

2475

avahi_strerror(ret_errno));

2923

2476

exitcode = EX_UNAVAILABLE;

2924

2477

goto end;

2925

2478

}

2960

2513

end:

2961

2514

2962

2515

if(debug){

2963

if(signal_received){

2964

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

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

2516

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

2970

2517

}

2971

2518

2972

2519

/* Cleanup things */

2983

2530

2984

2531

if(gnutls_initialized){

2985

2532

gnutls_certificate_free_credentials(mc.cred);

2533

gnutls_global_deinit();

2986

2534

gnutls_dh_params_deinit(mc.dh_params);

2987

2535

}

2988

2536

2996

2544

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

2997

2545

while(mc.current_server != NULL){

2998

2546

server *next = mc.current_server->next;

2999

#ifdef __GNUC__

3000

#pragma GCC diagnostic push

3001

#pragma GCC diagnostic ignored "-Wcast-qual"

3002

#endif

3003

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

3004

#ifdef __GNUC__

3005

#pragma GCC diagnostic pop

3006

#endif

3007

2547

free(mc.current_server);

3008

2548

mc.current_server = next;

3009

2549

}

3011

2551

3012

2552

/* Re-raise privileges */

3013

2553

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

2554

ret_errno = raise_privileges();

2555

if(ret_errno != 0){

3017

2556

perror_plus("Failed to raise privileges");

3018

2557

} else {

3019

2558

3024

2563

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

3025

2564

{

3026

2565

char *interface = NULL;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

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;

3033

2572

perror_plus("Failed to take down interface");

3034

2573

}

3035

2574

}

3040

2579

}

3041

2580

}

3042

2581

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

2582

ret_errno = lower_privileges_permanently();

2583

if(ret_errno != 0){

3046

2584

perror_plus("Failed to lower privileges permanently");

3047

2585

}

3048

2586

}

3050

2588

free(interfaces_to_take_down);

3051

2589

free(interfaces_hooks);

3052

2590

3053

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

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

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

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

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

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

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

3071

dirname, direntries[i]->d_name);

3072

}

3073

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

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

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

3077

AT_REMOVEDIR);

3078

}

3079

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

3080

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

3081

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

3082

/* Recurse only in this special case */

3083

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

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

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

3088

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

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

3107

}

3108

3109

2591

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

3110

2592

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

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

}

3112

2633

}

3113

2634

3114

2635

if(quit_now){