/mandos/trunk : revision 887

9

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

10

*

11

* Everything else is

12

13

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

46

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

47

strtof(), abort() */

48

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

49

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

50

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

49

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

50

asprintf(), strncpy(), strsignal()

51

*/

51

52

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

52

53

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

53

54

sockaddr_in6, PF_INET6,

57

58

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

58

59

inet_pton(), connect(),

59

60

getnameinfo() */

60

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

61

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

61

62

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

62

63

*/

63

64

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

64

65

strtoimax() */

65

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

66

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

67

EAI_SYSTEM, ENETUNREACH,

68

EHOSTUNREACH, ECONNREFUSED, EPROTO,

69

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

70

ENOTEMPTY,

66

71

program_invocation_short_name */

67

72

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

68

73

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

240

245

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

241

246

if(ret == -1){

242

247

perror_plus("clock_gettime");

243

free(new_server->ip);

248

#ifdef __GNUC__

249

#pragma GCC diagnostic push

250

#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

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

253

#ifdef __GNUC__

254

#pragma GCC diagnostic pop

255

#endif

244

256

free(new_server);

245

257

return false;

246

258

}

298

310

return false;

299

311

}

300

312

301

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

313

ret = close(fd);

302

314

if(ret == -1){

303

315

perror_plus("close");

304

316

}

486

498

return plaintext_length;

487

499

}

488

500

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

489

508

__attribute__((warn_unused_result))

490

509

static const char *safer_gnutls_strerror(int value){

491

510

const char *ret = gnutls_strerror(value);

492

if(ret == NULL)

493

ret = "(unknown)";

494

return ret;

511

return safe_string(ret);

495

512

}

496

513

497

514

/* GnuTLS log function callback */

501

518

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

502

519

}

503

520

504

__attribute__((nonnull, warn_unused_result))

521

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

505

522

static int init_gnutls_global(const char *pubkeyfilename,

506

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

507

525

mandos_context *mc){

508

526

int ret;

527

unsigned int uret;

509

528

510

529

if(debug){

511

530

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

512

531

}

513

532

514

ret = gnutls_global_init();

515

if(ret != GNUTLS_E_SUCCESS){

516

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

517

safer_gnutls_strerror(ret));

518

return -1;

519

}

520

521

533

if(debug){

522

534

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

523

535

* - GnuTLS manual

531

543

if(ret != GNUTLS_E_SUCCESS){

532

544

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

533

545

safer_gnutls_strerror(ret));

534

gnutls_global_deinit();

535

546

return -1;

536

547

}

537

548

562

573

safer_gnutls_strerror(ret));

563

574

goto globalfail;

564

575

}

565

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

566

if(ret != GNUTLS_E_SUCCESS){

567

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

568

safer_gnutls_strerror(ret));

569

goto globalfail;

570

}

571

576

/* If a Diffie-Hellman parameters file was given, try to use it */

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

free(params.data);

630

} while(false);

631

}

632

if(dhparamsfilename == NULL){

633

if(mc->dh_bits == 0){

634

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

635

/* Try to read the private key file */

636

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

637

do {

638

int secfile = open(seckeyfilename, O_RDONLY);

639

if(secfile == -1){

640

perror_plus("open");

641

break;

642

}

643

size_t buffer_capacity = 0;

644

while(true){

645

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

646

(size_t)buffer.size,

647

(size_t)buffer_capacity);

648

if(buffer_capacity == 0){

649

perror_plus("incbuffer");

650

free(buffer.data);

651

buffer.data = NULL;

652

break;

653

}

654

ssize_t bytes_read = read(secfile,

655

buffer.data + buffer.size,

656

BUFFER_SIZE);

657

/* EOF */

658

if(bytes_read == 0){

659

break;

660

}

661

/* check bytes_read for failure */

662

if(bytes_read < 0){

663

perror_plus("read");

664

free(buffer.data);

665

buffer.data = NULL;

666

break;

667

}

668

buffer.size += (unsigned int)bytes_read;

669

}

670

close(secfile);

671

} while(false);

672

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

673

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

674

if(buffer.data != NULL){

675

{

676

gnutls_openpgp_privkey_t privkey = NULL;

677

ret = gnutls_openpgp_privkey_init(&privkey);

678

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

681

safer_gnutls_strerror(ret));

682

free(buffer.data);

683

buffer.data = NULL;

684

} else {

685

ret = gnutls_openpgp_privkey_import

686

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

687

if(ret != GNUTLS_E_SUCCESS){

688

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

689

safer_gnutls_strerror(ret));

690

privkey = NULL;

691

}

692

free(buffer.data);

693

buffer.data = NULL;

694

if(privkey != NULL){

695

/* Use private key to suggest an appropriate

696

sec_param */

697

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

698

gnutls_openpgp_privkey_deinit(privkey);

699

if(debug){

700

fprintf_plus(stderr, "This OpenPGP key implies using"

701

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

702

safe_string(gnutls_sec_param_get_name

703

(sec_param)));

704

}

705

}

706

}

707

}

708

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

709

/* Err on the side of caution */

710

sec_param = GNUTLS_SEC_PARAM_ULTRA;

711

if(debug){

712

fprintf_plus(stderr, "Falling back to security parameter"

713

" \"%s\"\n",

714

safe_string(gnutls_sec_param_get_name

715

(sec_param)));

716

}

717

}

718

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

722

if(debug){

723

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

724

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

725

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

728

}

729

} else {

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

736

}

737

} else if(debug){

738

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

739

mc->dh_bits);

740

}

741

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

742

if(ret != GNUTLS_E_SUCCESS){

743

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

744

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

745

safer_gnutls_strerror(ret));

746

goto globalfail;

747

}

748

}

572

749

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

573

750

574

751

return 0;

576

753

globalfail:

577

754

578

755

gnutls_certificate_free_credentials(mc->cred);

579

gnutls_global_deinit();

580

756

gnutls_dh_params_deinit(mc->dh_params);

581

757

return -1;

582

758

}

634

810

/* ignore client certificate if any. */

635

811

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

636

812

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

638

639

813

return 0;

640

814

}

641

815

643

817

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

644

818

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

645

819

820

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

821

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

825

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

826

ret = errno;

827

}

828

errno = old_errno;

829

return ret;

830

}

831

832

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

833

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

838

errno = old_errno;

839

return ret;

840

}

841

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

842

ret = errno;

843

}

844

errno = old_errno;

845

return ret;

846

}

847

848

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

849

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

853

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

854

ret = errno;

855

}

856

errno = old_errno;

857

return ret;

858

}

859

860

/* Lower privileges permanently */

861

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

865

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

866

ret = errno;

867

}

868

errno = old_errno;

869

return ret;

870

}

871

872

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

873

__attribute__((nonnull, warn_unused_result))

874

static bool add_delete_local_route(const bool add,

875

const char *address,

876

AvahiIfIndex if_index){

877

int ret;

878

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

879

char add_arg[] = "add";

880

char delete_arg[] = "delete";

881

char debug_flag[] = "--debug";

882

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

883

if(pluginhelperdir == NULL){

884

if(debug){

885

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

886

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

887

}

888

return false;

889

}

890

891

char interface[IF_NAMESIZE];

892

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

893

perror_plus("if_indextoname");

894

return false;

895

}

896

897

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

898

if(devnull == -1){

899

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

900

return false;

901

}

902

pid_t pid = fork();

903

if(pid == 0){

904

/* Child */

905

/* Raise privileges */

906

errno = raise_privileges_permanently();

907

if(errno != 0){

908

perror_plus("Failed to raise privileges");

909

/* _exit(EX_NOPERM); */

910

} else {

911

/* Set group */

912

errno = 0;

913

ret = setgid(0);

914

if(ret == -1){

915

perror_plus("setgid");

916

_exit(EX_NOPERM);

917

}

918

/* Reset supplementary groups */

919

errno = 0;

920

ret = setgroups(0, NULL);

921

if(ret == -1){

922

perror_plus("setgroups");

923

_exit(EX_NOPERM);

924

}

925

}

926

ret = dup2(devnull, STDIN_FILENO);

927

if(ret == -1){

928

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

929

_exit(EX_OSERR);

930

}

931

ret = close(devnull);

932

if(ret == -1){

933

perror_plus("close");

934

_exit(EX_OSERR);

935

}

936

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

937

if(ret == -1){

938

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

939

_exit(EX_OSERR);

940

}

941

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

942

O_RDONLY

943

| O_DIRECTORY

944

| O_PATH

945

| O_CLOEXEC));

946

if(helperdir_fd == -1){

947

perror_plus("open");

948

_exit(EX_UNAVAILABLE);

949

}

950

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

951

helper, O_RDONLY));

952

if(helper_fd == -1){

953

perror_plus("openat");

954

close(helperdir_fd);

955

_exit(EX_UNAVAILABLE);

956

}

957

close(helperdir_fd);

958

#ifdef __GNUC__

959

#pragma GCC diagnostic push

960

#pragma GCC diagnostic ignored "-Wcast-qual"

961

#endif

962

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

963

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

964

interface, debug ? debug_flag : NULL, NULL },

965

environ) == -1){

966

#ifdef __GNUC__

967

#pragma GCC diagnostic pop

968

#endif

969

perror_plus("fexecve");

970

_exit(EXIT_FAILURE);

971

}

972

}

973

if(pid == -1){

974

perror_plus("fork");

975

return false;

976

}

977

int status;

978

pid_t pret = -1;

979

errno = 0;

980

do {

981

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

982

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

983

int errno_raising = 0;

984

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

985

errno_raising = errno;

986

perror_plus("Failed to raise privileges in order to"

987

" kill helper program");

988

}

989

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

990

perror_plus("kill");

991

}

992

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

993

perror_plus("Failed to lower privileges after killing"

994

" helper program");

995

}

996

return false;

997

}

998

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

999

if(pret == -1){

1000

perror_plus("waitpid");

1001

return false;

1002

}

1003

if(WIFEXITED(status)){

1004

if(WEXITSTATUS(status) != 0){

1005

fprintf_plus(stderr, "Error: iprouteadddel exited"

1006

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

1007

return false;

1008

}

1009

return true;

1010

}

1011

if(WIFSIGNALED(status)){

1012

fprintf_plus(stderr, "Error: iprouteadddel died by"

1013

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

1014

return false;

1015

}

1016

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

1017

return false;

1018

}

1019

1020

__attribute__((nonnull, warn_unused_result))

1021

static bool add_local_route(const char *address,

1022

AvahiIfIndex if_index){

1023

if(debug){

1024

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

1025

}

1026

return add_delete_local_route(true, address, if_index);

1027

}

1028

1029

__attribute__((nonnull, warn_unused_result))

1030

static bool delete_local_route(const char *address,

1031

AvahiIfIndex if_index){

1032

if(debug){

1033

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

1034

}

1035

return add_delete_local_route(false, address, if_index);

1036

}

1037

646

1038

/* Called when a Mandos server is found */

647

1039

__attribute__((nonnull, warn_unused_result))

648

1040

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

659

1051

int retval = -1;

660

1052

gnutls_session_t session;

661

1053

int pf; /* Protocol family */

1054

bool route_added = false;

662

1055

663

1056

errno = 0;

664

1057

722

1115

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

723

1116

}

724

1117

725

tcp_sd = socket(pf, SOCK_STREAM, 0);

1118

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

726

1119

if(tcp_sd < 0){

727

1120

int e = errno;

728

1121

perror_plus("socket");

735

1128

goto mandos_end;

736

1129

}

737

1130

738

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

739

1131

if(af == AF_INET6){

740

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

741

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

1132

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

1133

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

1134

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

742

1135

} else { /* IPv4 */

743

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

744

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

1136

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

1137

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

1138

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

745

1139

}

746

1140

if(ret < 0 ){

747

1141

int e = errno;

817

1211

goto mandos_end;

818

1212

}

819

1213

820

if(af == AF_INET6){

821

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

822

sizeof(struct sockaddr_in6));

823

} else {

824

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

825

sizeof(struct sockaddr_in));

826

}

827

if(ret < 0){

828

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

829

int e = errno;

830

perror_plus("connect");

831

errno = e;

832

}

833

goto mandos_end;

834

}

835

836

if(quit_now){

837

errno = EINTR;

838

goto mandos_end;

1214

while(true){

1215

if(af == AF_INET6){

1216

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

1217

sizeof(struct sockaddr_in6));

1218

} else {

1219

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

1220

sizeof(struct sockaddr_in));

1221

}

1222

if(ret < 0){

1223

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

1224

and if_index != AVAHI_IF_UNSPEC

1225

and connect_to == NULL

1226

and not route_added and

1227

((af == AF_INET6 and not

1228

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1229

&to)->sin6_addr)))

1230

or (af == AF_INET and

1231

/* Not a a IPv4LL address */

1232

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

1233

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

1234

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

1235

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

1236

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

1237

connect to a Mandos server announced by Avahi on a server

1238

host with a global address. Work around this by retrying

1239

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

1240

1241

Avahi bug reference:

1242

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

1243

https://bugs.debian.org/587961

1244

*/

1245

if(debug){

1246

fprintf_plus(stderr, "Mandos server unreachable, trying"

1247

" direct route\n");

1248

}

1249

int e = errno;

1250

route_added = add_local_route(ip, if_index);

1251

if(route_added){

1252

continue;

1253

}

1254

errno = e;

1255

}

1256

if(errno != ECONNREFUSED or debug){

1257

int e = errno;

1258

perror_plus("connect");

1259

errno = e;

1260

}

1261

goto mandos_end;

1262

}

1263

1264

if(quit_now){

1265

errno = EINTR;

1266

goto mandos_end;

1267

}

1268

break;

839

1269

}

840

1270

841

1271

const char *out = mandos_protocol_version;

995

1425

&decrypted_buffer, mc);

996

1426

if(decrypted_buffer_size >= 0){

997

1427

1428

clearerr(stdout);

998

1429

written = 0;

999

1430

while(written < (size_t) decrypted_buffer_size){

1000

1431

if(quit_now){

1016

1447

}

1017

1448

written += (size_t)ret;

1018

1449

}

1450

ret = fflush(stdout);

1451

if(ret != 0){

1452

int e = errno;

1453

if(debug){

1454

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

1455

strerror(errno));

1456

}

1457

errno = e;

1458

goto mandos_end;

1459

}

1019

1460

retval = 0;

1020

1461

}

1021

1462

}

1024

1465

1025

1466

mandos_end:

1026

1467

{

1468

if(route_added){

1469

if(not delete_local_route(ip, if_index)){

1470

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

1471

" interface %d", ip, if_index);

1472

}

1473

}

1027

1474

int e = errno;

1028

1475

free(decrypted_buffer);

1029

1476

free(buffer);

1030

1477

if(tcp_sd >= 0){

1031

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

1478

ret = close(tcp_sd);

1032

1479

}

1033

1480

if(ret == -1){

1034

1481

if(e == 0){

1069

1516

timed out */

1070

1517

1071

1518

if(quit_now){

1519

avahi_s_service_resolver_free(r);

1072

1520

return;

1073

1521

}

1074

1522

1188

1636

__attribute__((nonnull, warn_unused_result))

1189

1637

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

1190

1638

int ret;

1191

error_t ret_errno;

1639

int old_errno;

1192

1640

1193

1641

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

1194

1642

if(s < 0){

1195

ret_errno = errno;

1643

old_errno = errno;

1196

1644

perror_plus("socket");

1197

errno = ret_errno;

1645

errno = old_errno;

1198

1646

return false;

1199

1647

}

1200

strcpy(ifr->ifr_name, ifname);

1648

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

1649

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

1201

1650

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1202

1651

if(ret == -1){

1203

1652

if(debug){

1204

ret_errno = errno;

1653

old_errno = errno;

1205

1654

perror_plus("ioctl SIOCGIFFLAGS");

1206

errno = ret_errno;

1655

errno = old_errno;

1207

1656

}

1208

1657

return false;

1209

1658

}

1454

1903

}

1455

1904

}

1456

1905

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

__attribute__((warn_unused_result))

1471

error_t raise_privileges_permanently(void){

1472

error_t old_errno = errno;

1473

error_t ret_errno = raise_privileges();

1474

if(ret_errno != 0){

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

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

1479

ret_errno = errno;

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

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

1486

__attribute__((warn_unused_result))

1487

error_t lower_privileges(void){

1488

error_t old_errno = errno;

1489

error_t ret_errno = 0;

1490

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

1491

ret_errno = errno;

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

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

1906

__attribute__((nonnull))

1510

1907

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

1511

1908

const float delay){

1512

1909

struct dirent **direntries = NULL;

1513

1910

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1911

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1912

| O_CLOEXEC);

1515

1913

if(hookdir_fd == -1){

1516

1914

if(errno == ENOENT){

1517

1915

if(debug){

1524

1922

return;

1525

1923

}

1526

1924

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

1925

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

1530

1926

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1539

1927

if(numhooks == -1){

1540

1928

perror_plus("scandir");

1541

1929

return;

1542

1930

}

1543

1931

struct dirent *direntry;

1544

1932

int ret;

1545

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

1933

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

1934

if(devnull == -1){

1935

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

1936

return;

1937

}

1546

1938

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

1547

1939

direntry = direntries[i];

1548

1940

if(debug){

1572

1964

perror_plus("setgroups");

1573

1965

_exit(EX_NOPERM);

1574

1966

}

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

1967

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

1591

1968

if(ret == -1){

1592

1969

perror_plus("setenv");

1627

2004

_exit(EX_OSERR);

1628

2005

}

1629

2006

}

1630

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

2007

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

2008

direntry->d_name,

2009

O_RDONLY));

1631

2010

if(hook_fd == -1){

1632

2011

perror_plus("openat");

1633

2012

_exit(EXIT_FAILURE);

1634

2013

}

1635

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

2014

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

1636

2015

perror_plus("close");

1637

2016

_exit(EXIT_FAILURE);

1638

2017

}

2018

ret = dup2(devnull, STDIN_FILENO);

2019

if(ret == -1){

2020

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

2021

_exit(EX_OSERR);

2022

}

2023

ret = close(devnull);

2024

if(ret == -1){

2025

perror_plus("close");

2026

_exit(EX_OSERR);

2027

}

2028

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2029

if(ret == -1){

2030

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

2031

_exit(EX_OSERR);

2032

}

1639

2033

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

1640

2034

environ) == -1){

1641

2035

perror_plus("fexecve");

1642

2036

_exit(EXIT_FAILURE);

1643

2037

}

1644

2038

} else {

2039

if(hook_pid == -1){

2040

perror_plus("fork");

2041

free(direntry);

2042

continue;

2043

}

1645

2044

int status;

1646

2045

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

1647

2046

perror_plus("waitpid");

2047

free(direntry);

1648

2048

continue;

1649

2049

}

1650

2050

if(WIFEXITED(status)){

1652

2052

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

1653

2053

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

1654

2054

WEXITSTATUS(status));

2055

free(direntry);

1655

2056

continue;

1656

2057

}

1657

2058

} else if(WIFSIGNALED(status)){

1658

2059

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

1659

2060

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

1660

2061

WTERMSIG(status));

2062

free(direntry);

1661

2063

continue;

1662

2064

} else {

1663

2065

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

1664

2066

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

2067

free(direntry);

1665

2068

continue;

1666

2069

}

1667

2070

}

1669

2072

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

1670

2073

direntry->d_name);

1671

2074

}

2075

free(direntry);

1672

2076

}

1673

2077

free(direntries);

1674

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

2078

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

1675

2079

perror_plus("close");

1676

2080

} else {

1677

2081

hookdir_fd = -1;

1680

2084

}

1681

2085

1682

2086

__attribute__((nonnull, warn_unused_result))

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

2087

int bring_up_interface(const char *const interface,

2088

const float delay){

2089

int old_errno = errno;

1686

2090

int ret;

1687

2091

struct ifreq network;

1688

2092

unsigned int if_index = if_nametoindex(interface);

1698

2102

}

1699

2103

1700

2104

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

2105

int ret_errno = 0;

2106

int ioctl_errno = 0;

1702

2107

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

1703

2108

ret_errno = errno;

1704

2109

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

1717

2122

}

1718

2123

1719

2124

if(quit_now){

1720

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

2125

ret = close(sd);

1721

2126

if(ret == -1){

1722

2127

perror_plus("close");

1723

2128

}

1773

2178

}

1774

2179

1775

2180

/* Close the socket */

1776

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

2181

ret = close(sd);

1777

2182

if(ret == -1){

1778

2183

perror_plus("close");

1779

2184

}

1807

2212

}

1808

2213

1809

2214

__attribute__((nonnull, warn_unused_result))

1810

error_t take_down_interface(const char *const interface){

1811

error_t old_errno = errno;

2215

int take_down_interface(const char *const interface){

2216

int old_errno = errno;

1812

2217

struct ifreq network;

1813

2218

unsigned int if_index = if_nametoindex(interface);

1814

2219

if(if_index == 0){

1817

2222

return ENXIO;

1818

2223

}

1819

2224

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

2225

int ret_errno = 0;

2226

int ioctl_errno = 0;

1821

2227

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

1822

2228

ret_errno = errno;

1823

2229

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

1861

2267

}

1862

2268

1863

2269

/* Close the socket */

1864

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

2270

int ret = close(sd);

1865

2271

if(ret == -1){

1866

2272

perror_plus("close");

1867

2273

}

1882

2288

}

1883

2289

1884

2290

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

1885

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

1886

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

1887

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

1888

.interfaces = NULL, .interfaces_size = 0 };

2291

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

2292

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

2293

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

2294

.current_server = NULL, .interfaces = NULL,

2295

.interfaces_size = 0 };

1889

2296

AvahiSServiceBrowser *sb = NULL;

1890

2297

error_t ret_errno;

1891

2298

int ret;

1900

2307

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1901

2308

const char *seckey = PATHDIR "/" SECKEY;

1902

2309

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

1903

2311

char *interfaces_hooks = NULL;

1904

2312

1905

2313

bool gnutls_initialized = false;

1958

2366

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

1959

2367

" Diffie-Hellman key exchange",

1960

2368

.group = 2 },

2369

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

2370

.arg = "FILE",

2371

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

2372

" for the Diffie-Hellman key exchange",

2373

.group = 2 },

1961

2374

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

1962

2375

.arg = "STRING",

1963

2376

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

2018

2431

}

2019

2432

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

2020

2433

break;

2434

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

2435

dh_params_file = arg;

2436

break;

2021

2437

case 130: /* --priority */

2022

2438

mc.priority = arg;

2023

2439

break;

2063

2479

.args_doc = "",

2064

2480

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

2065

2481

" passwords from a Mandos server" };

2066

ret = argp_parse(&argp, argc, argv,

2067

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2068

switch(ret){

2482

ret_errno = argp_parse(&argp, argc, argv,

2483

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2484

switch(ret_errno){

2069

2485

case 0:

2070

2486

break;

2071

2487

case ENOMEM:

2072

2488

default:

2073

errno = ret;

2489

errno = ret_errno;

2074

2490

perror_plus("argp_parse");

2075

2491

exitcode = EX_OSERR;

2076

2492

goto end;

2079

2495

goto end;

2080

2496

}

2081

2497

}

2082

2498

2083

2499

{

2084

2500

/* Work around Debian bug #633582:

2085

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

2501

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

2086

2502

2087

2503

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2504

ret = raise_privileges();

2505

if(ret != 0){

2506

errno = ret;

2091

2507

perror_plus("Failed to raise privileges");

2092

2508

} else {

2093

2509

struct stat st;

2109

2525

}

2110

2526

}

2111

2527

}

2112

TEMP_FAILURE_RETRY(close(seckey_fd));

2528

close(seckey_fd);

2113

2529

}

2114

2530

}

2115

2531

2116

2532

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

2117

2533

int pubkey_fd = open(pubkey, O_RDONLY);

2118

2534

if(pubkey_fd == -1){

2130

2546

}

2131

2547

}

2132

2548

}

2133

TEMP_FAILURE_RETRY(close(pubkey_fd));

2134

}

2135

}

2136

2549

close(pubkey_fd);

2550

}

2551

}

2552

2553

if(dh_params_file != NULL

2554

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

2555

int dhparams_fd = open(dh_params_file, O_RDONLY);

2556

if(dhparams_fd == -1){

2557

perror_plus("open");

2558

} else {

2559

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

2560

if(ret == -1){

2561

perror_plus("fstat");

2562

} else {

2563

if(S_ISREG(st.st_mode)

2564

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

2565

ret = fchown(dhparams_fd, uid, gid);

2566

if(ret == -1){

2567

perror_plus("fchown");

2568

}

2569

}

2570

}

2571

close(dhparams_fd);

2572

}

2573

}

2574

2137

2575

/* Lower privileges */

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2576

ret = lower_privileges();

2577

if(ret != 0){

2578

errno = ret;

2141

2579

perror_plus("Failed to lower privileges");

2142

2580

}

2143

2581

}

2268

2706

if(ret_errno != 0){

2269

2707

errno = ret_errno;

2270

2708

perror_plus("argz_add");

2709

free(direntries[i]);

2271

2710

continue;

2272

2711

}

2273

2712

if(debug){

2274

2713

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

2275

2714

direntries[i]->d_name);

2276

2715

}

2716

free(direntries[i]);

2277

2717

}

2278

2718

free(direntries);

2279

2719

} else {

2311

2751

errno = bring_up_interface(interface, delay);

2312

2752

if(not interface_was_up){

2313

2753

if(errno != 0){

2314

perror_plus("Failed to bring up interface");

2754

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

2755

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

2315

2756

} else {

2316

2757

errno = argz_add(&interfaces_to_take_down,

2317

2758

&interfaces_to_take_down_size,

2340

2781

goto end;

2341

2782

}

2342

2783

2343

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

2784

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

2344

2785

if(ret == -1){

2345

2786

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

2346

2787

exitcode = EX_UNAVAILABLE;

2468

2909

2469

2910

/* Allocate a new server */

2470

2911

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2471

&config, NULL, NULL, &ret_errno);

2912

&config, NULL, NULL, &ret);

2472

2913

2473

2914

/* Free the Avahi configuration data */

2474

2915

avahi_server_config_free(&config);

2477

2918

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

2478

2919

if(mc.server == NULL){

2479

2920

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

2480

avahi_strerror(ret_errno));

2921

avahi_strerror(ret));

2481

2922

exitcode = EX_UNAVAILABLE;

2482

2923

goto end;

2483

2924

}

2518

2959

end:

2519

2960

2520

2961

if(debug){

2521

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

2962

if(signal_received){

2963

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

2964

argv[0], signal_received,

2965

strsignal(signal_received));

2966

} else {

2967

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

2968

}

2522

2969

}

2523

2970

2524

2971

/* Cleanup things */

2535

2982

2536

2983

if(gnutls_initialized){

2537

2984

gnutls_certificate_free_credentials(mc.cred);

2538

gnutls_global_deinit();

2539

2985

gnutls_dh_params_deinit(mc.dh_params);

2540

2986

}

2541

2987

2549

2995

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

2550

2996

while(mc.current_server != NULL){

2551

2997

server *next = mc.current_server->next;

2998

#ifdef __GNUC__

2999

#pragma GCC diagnostic push

3000

#pragma GCC diagnostic ignored "-Wcast-qual"

3001

#endif

3002

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

3003

#ifdef __GNUC__

3004

#pragma GCC diagnostic pop

3005

#endif

2552

3006

free(mc.current_server);

2553

3007

mc.current_server = next;

2554

3008

}

2556

3010

2557

3011

/* Re-raise privileges */

2558

3012

{

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

3013

ret = raise_privileges();

3014

if(ret != 0){

3015

errno = ret;

2562

3016

perror_plus("Failed to raise privileges");

2563

3017

} else {

2564

3018

2572

3026

while((interface=argz_next(interfaces_to_take_down,

2573

3027

interfaces_to_take_down_size,

2574

3028

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

3029

ret = take_down_interface(interface);

3030

if(ret != 0){

3031

errno = ret;

2578

3032

perror_plus("Failed to take down interface");

2579

3033

}

2580

3034

}

2585

3039

}

2586

3040

}

2587

3041

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

3042

ret = lower_privileges_permanently();

3043

if(ret != 0){

3044

errno = ret;

2591

3045

perror_plus("Failed to lower privileges permanently");

2592

3046

}

2593

3047

}

2595

3049

free(interfaces_to_take_down);

2596

3050

free(interfaces_hooks);

2597

3051

3052

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

3053

uintmax_t level){

3054

struct dirent **direntries = NULL;

3055

int dret;

3056

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

3057

O_RDONLY

3058

| O_NOFOLLOW

3059

| O_DIRECTORY

3060

| O_PATH));

3061

if(dir_fd == -1){

3062

perror_plus("open");

3063

}

3064

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

3065

notdotentries, alphasort);

3066

if(numentries >= 0){

3067

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

3068

if(debug){

3069

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

3070

dirname, direntries[i]->d_name);

3071

}

3072

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

3073

if(dret == -1){

3074

if(errno == EISDIR){

3075

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

3076

AT_REMOVEDIR);

3077

}

3078

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

3079

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

3080

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

3081

/* Recurse only in this special case */

3082

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

3083

dret = 0;

3084

}

3085

if(dret == -1){

3086

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

3087

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

3088

}

3089

}

3090

free(direntries[i]);

3091

}

3092

3093

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

3094

free(direntries);

3095

if(numentries == -1){

3096

perror_plus("scandirat");

3097

}

3098

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3099

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

3100

perror_plus("rmdir");

3101

}

3102

} else {

3103

perror_plus("scandirat");

3104

}

3105

close(dir_fd);

3106

}

3107

2598

3108

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

2599

3109

if(tempdir != NULL){

2600

struct dirent **direntries = NULL;

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2637

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2639

}

3110

clean_dir_at(-1, tempdir, 0);

2640

3111

}

2641

3112

2642

3113

if(quit_now){