/mandos/trunk : revision 705

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> /* strcmp(), strlen(), strerror(),

50

asprintf(), strncpy() */

49

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

50

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

51

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

52

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

53

sockaddr_in6, PF_INET6,

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

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

61

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

62

*/

63

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

64

strtoimax() */

65

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

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

65

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

70

66

program_invocation_short_name */

71

67

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

72

68

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

238

234

.af = af };

239

235

if(new_server->ip == NULL){

240

236

perror_plus("strdup");

241

free(new_server);

242

237

return false;

243

238

}

244

239

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

245

240

if(ret == -1){

246

241

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

255

free(new_server);

256

242

return false;

257

243

}

258

244

/* Special case of first server */

309

295

return false;

310

296

}

311

297

312

ret = close(fd);

298

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

313

299

if(ret == -1){

314

300

perror_plus("close");

315

301

}

497

483

return plaintext_length;

498

484

}

499

485

500

__attribute__((warn_unused_result, const))

501

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

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

486

__attribute__((warn_unused_result))

508

487

static const char *safer_gnutls_strerror(int value){

509

488

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

511

492

}

512

493

513

494

/* GnuTLS log function callback */

517

498

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

518

499

}

519

500

520

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

501

__attribute__((nonnull, warn_unused_result))

521

502

static int init_gnutls_global(const char *pubkeyfilename,

522

503

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

504

mandos_context *mc){

525

505

int ret;

526

unsigned int uret;

527

506

528

507

if(debug){

529

508

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

530

509

}

531

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

532

518

if(debug){

533

519

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

534

520

* - GnuTLS manual

542

528

if(ret != GNUTLS_E_SUCCESS){

543

529

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

544

530

safer_gnutls_strerror(ret));

531

gnutls_global_deinit();

545

532

return -1;

546

533

}

547

534

572

559

safer_gnutls_strerror(ret));

573

560

goto globalfail;

574

561

}

575

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

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

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

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

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

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

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

624

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

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

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

722

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

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

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

747

569

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

748

570

749

571

return 0;

751

573

globalfail:

752

574

753

575

gnutls_certificate_free_credentials(mc->cred);

576

gnutls_global_deinit();

754

577

gnutls_dh_params_deinit(mc->dh_params);

755

578

return -1;

756

579

}

808

631

/* ignore client certificate if any. */

809

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

633

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

635

811

636

return 0;

812

637

}

813

638

815

640

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

816

641

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

817

642

818

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

819

__attribute__((warn_unused_result))

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

823

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

824

ret = errno;

825

}

826

errno = old_errno;

827

return ret;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

836

errno = old_errno;

837

return ret;

838

}

839

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

840

ret = errno;

841

}

842

errno = old_errno;

843

return ret;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

851

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

852

ret = errno;

853

}

854

errno = old_errno;

855

return ret;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

863

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

864

ret = errno;

865

}

866

errno = old_errno;

867

return ret;

868

}

869

870

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

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

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

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

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

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

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

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

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

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

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

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

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

961

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

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

980

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

981

int errno_raising = 0;

982

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

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

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

988

perror_plus("kill");

989

}

990

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

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

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

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

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

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

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

1012

return false;

1013

}

1014

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

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

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

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

1036

643

/* Called when a Mandos server is found */

1037

644

__attribute__((nonnull, warn_unused_result))

1038

645

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

1049

656

int retval = -1;

1050

657

gnutls_session_t session;

1051

658

int pf; /* Protocol family */

1052

bool route_added = false;

1053

659

1054

660

errno = 0;

1055

661

1113

719

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

1114

720

}

1115

721

1116

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

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

723

if(tcp_sd < 0){

1118

724

int e = errno;

1119

725

perror_plus("socket");

1126

732

goto mandos_end;

1127

733

}

1128

734

735

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

1129

736

if(af == AF_INET6){

1130

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

1131

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

1132

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);

1133

739

} else { /* IPv4 */

1134

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

1135

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

1136

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);

1137

742

}

1138

743

if(ret < 0 ){

1139

744

int e = errno;

1209

814

goto mandos_end;

1210

815

}

1211

816

1212

while(true){

1213

if(af == AF_INET6){

1214

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

1215

sizeof(struct sockaddr_in6));

1216

} else {

1217

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

1218

sizeof(struct sockaddr_in));

1219

}

1220

if(ret < 0){

1221

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

1222

and if_index != AVAHI_IF_UNSPEC

1223

and connect_to == NULL

1224

and not route_added and

1225

((af == AF_INET6 and not

1226

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1227

&to)->sin6_addr)))

1228

or (af == AF_INET and

1229

/* Not a a IPv4LL address */

1230

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

1231

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

1232

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

1233

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

1234

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

1235

connect to a Mandos server announced by Avahi on a server

1236

host with a global address. Work around this by retrying

1237

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

1238

1239

Avahi bug reference:

1240

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

1241

https://bugs.debian.org/587961

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

int e = errno;

1248

route_added = add_local_route(ip, if_index);

1249

if(route_added){

1250

continue;

1251

}

1252

errno = e;

1253

}

1254

if(errno != ECONNREFUSED or debug){

1255

int e = errno;

1256

perror_plus("connect");

1257

errno = e;

1258

}

1259

goto mandos_end;

1260

}

1261

1262

if(quit_now){

1263

errno = EINTR;

1264

goto mandos_end;

1265

}

1266

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;

1267

836

}

1268

837

1269

838

const char *out = mandos_protocol_version;

1423

992

&decrypted_buffer, mc);

1424

993

if(decrypted_buffer_size >= 0){

1425

994

1426

clearerr(stdout);

1427

995

written = 0;

1428

996

while(written < (size_t) decrypted_buffer_size){

1429

997

if(quit_now){

1445

1013

}

1446

1014

written += (size_t)ret;

1447

1015

}

1448

ret = fflush(stdout);

1449

if(ret != 0){

1450

int e = errno;

1451

if(debug){

1452

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

1453

strerror(errno));

1454

}

1455

errno = e;

1456

goto mandos_end;

1457

}

1458

1016

retval = 0;

1459

1017

}

1460

1018

}

1463

1021

1464

1022

mandos_end:

1465

1023

{

1466

if(route_added){

1467

if(not delete_local_route(ip, if_index)){

1468

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

1469

" interface %d", ip, if_index);

1470

}

1471

}

1472

1024

int e = errno;

1473

1025

free(decrypted_buffer);

1474

1026

free(buffer);

1475

1027

if(tcp_sd >= 0){

1476

ret = close(tcp_sd);

1028

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

1477

1029

}

1478

1030

if(ret == -1){

1479

1031

if(e == 0){

1514

1066

timed out */

1515

1067

1516

1068

if(quit_now){

1517

avahi_s_service_resolver_free(r);

1518

1069

return;

1519

1070

}

1520

1071

1634

1185

__attribute__((nonnull, warn_unused_result))

1635

1186

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

1636

1187

int ret;

1637

int old_errno;

1188

error_t ret_errno;

1638

1189

1639

1190

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

1640

1191

if(s < 0){

1641

old_errno = errno;

1192

ret_errno = errno;

1642

1193

perror_plus("socket");

1643

errno = old_errno;

1194

errno = ret_errno;

1644

1195

return false;

1645

1196

}

1646

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

1647

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

1197

strcpy(ifr->ifr_name, ifname);

1648

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1649

1199

if(ret == -1){

1650

1200

if(debug){

1651

old_errno = errno;

1201

ret_errno = errno;

1652

1202

perror_plus("ioctl SIOCGIFFLAGS");

1653

errno = old_errno;

1203

errno = ret_errno;

1654

1204

}

1655

1205

return false;

1656

1206

}

1901

1451

}

1902

1452

}

1903

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

1904

1510

__attribute__((nonnull))

1905

1511

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

1906

1512

const float delay){

1907

1513

struct dirent **direntries = NULL;

1908

1514

if(hookdir_fd == -1){

1909

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1910

| O_CLOEXEC);

1515

hookdir_fd = open(hookdir, O_RDONLY);

1911

1516

if(hookdir_fd == -1){

1912

1517

if(errno == ENOENT){

1913

1518

if(debug){

1920

1525

return;

1921

1526

}

1922

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1923

1530

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

1924

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__ */

1925

1540

if(numhooks == -1){

1926

1541

perror_plus("scandir");

1927

1542

return;

1928

1543

}

1929

1544

struct dirent *direntry;

1930

1545

int ret;

1931

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

1932

if(devnull == -1){

1933

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

1934

return;

1935

}

1546

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

1936

1547

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

1937

1548

direntry = direntries[i];

1938

1549

if(debug){

1943

1554

if(hook_pid == 0){

1944

1555

/* Child */

1945

1556

/* Raise privileges */

1946

errno = raise_privileges_permanently();

1947

if(errno != 0){

1557

if(raise_privileges_permanently() != 0){

1948

1558

perror_plus("Failed to raise privileges");

1949

1559

_exit(EX_NOPERM);

1950

1560

}

1962

1572

perror_plus("setgroups");

1963

1573

_exit(EX_NOPERM);

1964

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

}

1965

1590

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

1966

1591

if(ret == -1){

1967

1592

perror_plus("setenv");

2002

1627

_exit(EX_OSERR);

2003

1628

}

2004

1629

}

2005

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

2006

direntry->d_name,

2007

O_RDONLY));

1630

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

2008

1631

if(hook_fd == -1){

2009

1632

perror_plus("openat");

2010

1633

_exit(EXIT_FAILURE);

2011

1634

}

2012

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

1635

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

2013

1636

perror_plus("close");

2014

1637

_exit(EXIT_FAILURE);

2015

1638

}

2016

ret = dup2(devnull, STDIN_FILENO);

2017

if(ret == -1){

2018

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

2019

_exit(EX_OSERR);

2020

}

2021

ret = close(devnull);

2022

if(ret == -1){

2023

perror_plus("close");

2024

_exit(EX_OSERR);

2025

}

2026

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2027

if(ret == -1){

2028

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

2029

_exit(EX_OSERR);

2030

}

2031

1639

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

2032

1640

environ) == -1){

2033

1641

perror_plus("fexecve");

2034

1642

_exit(EXIT_FAILURE);

2035

1643

}

2036

1644

} else {

2037

if(hook_pid == -1){

2038

perror_plus("fork");

2039

free(direntry);

2040

continue;

2041

}

2042

1645

int status;

2043

1646

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

2044

1647

perror_plus("waitpid");

2045

free(direntry);

2046

1648

continue;

2047

1649

}

2048

1650

if(WIFEXITED(status)){

2050

1652

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

2051

1653

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

2052

1654

WEXITSTATUS(status));

2053

free(direntry);

2054

1655

continue;

2055

1656

}

2056

1657

} else if(WIFSIGNALED(status)){

2057

1658

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

2058

1659

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

2059

1660

WTERMSIG(status));

2060

free(direntry);

2061

1661

continue;

2062

1662

} else {

2063

1663

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

2064

1664

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

2065

free(direntry);

2066

1665

continue;

2067

1666

}

2068

1667

}

2070

1669

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

2071

1670

direntry->d_name);

2072

1671

}

2073

free(direntry);

2074

1672

}

2075

1673

free(direntries);

2076

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

1674

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

2077

1675

perror_plus("close");

2078

1676

} else {

2079

1677

hookdir_fd = -1;

2082

1680

}

2083

1681

2084

1682

__attribute__((nonnull, warn_unused_result))

2085

int bring_up_interface(const char *const interface,

2086

const float delay){

2087

int old_errno = errno;

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

2088

1686

int ret;

2089

1687

struct ifreq network;

2090

1688

unsigned int if_index = if_nametoindex(interface);

2100

1698

}

2101

1699

2102

1700

if(not interface_is_up(interface)){

2103

int ret_errno = 0;

2104

int ioctl_errno = 0;

1701

error_t ret_errno = 0, ioctl_errno = 0;

2105

1702

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

2106

1703

ret_errno = errno;

2107

1704

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

2120

1717

}

2121

1718

2122

1719

if(quit_now){

2123

ret = close(sd);

1720

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

2124

1721

if(ret == -1){

2125

1722

perror_plus("close");

2126

1723

}

2136

1733

/* Raise privileges */

2137

1734

ret_errno = raise_privileges();

2138

1735

if(ret_errno != 0){

2139

errno = ret_errno;

2140

1736

perror_plus("Failed to raise privileges");

2141

1737

}

2142

1738

2176

1772

}

2177

1773

2178

1774

/* Close the socket */

2179

ret = close(sd);

1775

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

2180

1776

if(ret == -1){

2181

1777

perror_plus("close");

2182

1778

}

2210

1806

}

2211

1807

2212

1808

__attribute__((nonnull, warn_unused_result))

2213

int take_down_interface(const char *const interface){

2214

int old_errno = errno;

1809

error_t take_down_interface(const char *const interface){

1810

error_t old_errno = errno;

2215

1811

struct ifreq network;

2216

1812

unsigned int if_index = if_nametoindex(interface);

2217

1813

if(if_index == 0){

2220

1816

return ENXIO;

2221

1817

}

2222

1818

if(interface_is_up(interface)){

2223

int ret_errno = 0;

2224

int ioctl_errno = 0;

1819

error_t ret_errno = 0, ioctl_errno = 0;

2225

1820

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

2226

1821

ret_errno = errno;

2227

1822

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

2247

1842

/* Raise privileges */

2248

1843

ret_errno = raise_privileges();

2249

1844

if(ret_errno != 0){

2250

errno = ret_errno;

2251

1845

perror_plus("Failed to raise privileges");

2252

1846

}

2253

1847

2265

1859

}

2266

1860

2267

1861

/* Close the socket */

2268

int ret = close(sd);

1862

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

2269

1863

if(ret == -1){

2270

1864

perror_plus("close");

2271

1865

}

2286

1880

}

2287

1881

2288

1882

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

2289

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

2290

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

2291

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

2292

.current_server = NULL, .interfaces = NULL,

2293

.interfaces_size = 0 };

1883

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

1884

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

1885

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

1886

.interfaces = NULL, .interfaces_size = 0 };

2294

1887

AvahiSServiceBrowser *sb = NULL;

2295

1888

error_t ret_errno;

2296

1889

int ret;

2305

1898

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2306

1899

const char *seckey = PATHDIR "/" SECKEY;

2307

1900

const char *pubkey = PATHDIR "/" PUBKEY;

2308

const char *dh_params_file = NULL;

2309

1901

char *interfaces_hooks = NULL;

2310

1902

2311

1903

bool gnutls_initialized = false;

2364

1956

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

2365

1957

" Diffie-Hellman key exchange",

2366

1958

.group = 2 },

2367

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

2368

.arg = "FILE",

2369

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

2370

" for the Diffie-Hellman key exchange",

2371

.group = 2 },

2372

1959

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

2373

1960

.arg = "STRING",

2374

1961

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

2429

2016

}

2430

2017

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

2431

2018

break;

2432

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

2433

dh_params_file = arg;

2434

break;

2435

2019

case 130: /* --priority */

2436

2020

mc.priority = arg;

2437

2021

break;

2477

2061

.args_doc = "",

2478

2062

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

2479

2063

" passwords from a Mandos server" };

2480

ret_errno = argp_parse(&argp, argc, argv,

2481

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2482

switch(ret_errno){

2064

ret = argp_parse(&argp, argc, argv,

2065

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2066

switch(ret){

2483

2067

case 0:

2484

2068

break;

2485

2069

case ENOMEM:

2486

2070

default:

2487

errno = ret_errno;

2071

errno = ret;

2488

2072

perror_plus("argp_parse");

2489

2073

exitcode = EX_OSERR;

2490

2074

goto end;

2493

2077

goto end;

2494

2078

}

2495

2079

}

2496

2080

2497

2081

{

2498

2082

/* Work around Debian bug #633582:

2499

2083

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

2500

2084

2501

2085

/* Re-raise privileges */

2502

ret = raise_privileges();

2503

if(ret != 0){

2504

errno = ret;

2086

ret_errno = raise_privileges();

2087

if(ret_errno != 0){

2088

errno = ret_errno;

2505

2089

perror_plus("Failed to raise privileges");

2506

2090

} else {

2507

2091

struct stat st;

2523

2107

}

2524

2108

}

2525

2109

}

2526

close(seckey_fd);

2110

TEMP_FAILURE_RETRY(close(seckey_fd));

2527

2111

}

2528

2112

}

2529

2113

2530

2114

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

2531

2115

int pubkey_fd = open(pubkey, O_RDONLY);

2532

2116

if(pubkey_fd == -1){

2544

2128

}

2545

2129

}

2546

2130

}

2547

close(pubkey_fd);

2548

}

2549

}

2550

2551

if(dh_params_file != NULL

2552

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

2553

int dhparams_fd = open(dh_params_file, O_RDONLY);

2554

if(dhparams_fd == -1){

2555

perror_plus("open");

2556

} else {

2557

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

2558

if(ret == -1){

2559

perror_plus("fstat");

2560

} else {

2561

if(S_ISREG(st.st_mode)

2562

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

2563

ret = fchown(dhparams_fd, uid, gid);

2564

if(ret == -1){

2565

perror_plus("fchown");

2566

}

2567

}

2568

}

2569

close(dhparams_fd);

2570

}

2571

}

2572

2131

TEMP_FAILURE_RETRY(close(pubkey_fd));

2132

}

2133

}

2134

2573

2135

/* Lower privileges */

2574

ret = lower_privileges();

2575

if(ret != 0){

2576

errno = ret;

2136

ret_errno = lower_privileges();

2137

if(ret_errno != 0){

2138

errno = ret_errno;

2577

2139

perror_plus("Failed to lower privileges");

2578

2140

}

2579

2141

}

2704

2266

if(ret_errno != 0){

2705

2267

errno = ret_errno;

2706

2268

perror_plus("argz_add");

2707

free(direntries[i]);

2708

2269

continue;

2709

2270

}

2710

2271

if(debug){

2711

2272

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

2712

2273

direntries[i]->d_name);

2713

2274

}

2714

free(direntries[i]);

2715

2275

}

2716

2276

free(direntries);

2717

2277

} else {

2749

2309

errno = bring_up_interface(interface, delay);

2750

2310

if(not interface_was_up){

2751

2311

if(errno != 0){

2752

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

2753

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

2312

perror_plus("Failed to bring up interface");

2754

2313

} else {

2755

2314

errno = argz_add(&interfaces_to_take_down,

2756

2315

&interfaces_to_take_down_size,

2779

2338

goto end;

2780

2339

}

2781

2340

2782

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

2341

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

2783

2342

if(ret == -1){

2784

2343

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

2785

2344

exitcode = EX_UNAVAILABLE;

2907

2466

2908

2467

/* Allocate a new server */

2909

2468

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2910

&config, NULL, NULL, &ret);

2469

&config, NULL, NULL, &ret_errno);

2911

2470

2912

2471

/* Free the Avahi configuration data */

2913

2472

avahi_server_config_free(&config);

2916

2475

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

2917

2476

if(mc.server == NULL){

2918

2477

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

2919

avahi_strerror(ret));

2478

avahi_strerror(ret_errno));

2920

2479

exitcode = EX_UNAVAILABLE;

2921

2480

goto end;

2922

2481

}

2974

2533

2975

2534

if(gnutls_initialized){

2976

2535

gnutls_certificate_free_credentials(mc.cred);

2536

gnutls_global_deinit();

2977

2537

gnutls_dh_params_deinit(mc.dh_params);

2978

2538

}

2979

2539

2987

2547

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

2988

2548

while(mc.current_server != NULL){

2989

2549

server *next = mc.current_server->next;

2990

#ifdef __GNUC__

2991

#pragma GCC diagnostic push

2992

#pragma GCC diagnostic ignored "-Wcast-qual"

2993

#endif

2994

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

2995

#ifdef __GNUC__

2996

#pragma GCC diagnostic pop

2997

#endif

2998

2550

free(mc.current_server);

2999

2551

mc.current_server = next;

3000

2552

}

3002

2554

3003

2555

/* Re-raise privileges */

3004

2556

{

3005

ret = raise_privileges();

3006

if(ret != 0){

3007

errno = ret;

2557

ret_errno = raise_privileges();

2558

if(ret_errno != 0){

3008

2559

perror_plus("Failed to raise privileges");

3009

2560

} else {

3010

2561

3018

2569

while((interface=argz_next(interfaces_to_take_down,

3019

2570

interfaces_to_take_down_size,

3020

2571

interface))){

3021

ret = take_down_interface(interface);

3022

if(ret != 0){

3023

errno = ret;

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

3024

2575

perror_plus("Failed to take down interface");

3025

2576

}

3026

2577

}

3031

2582

}

3032

2583

}

3033

2584

3034

ret = lower_privileges_permanently();

3035

if(ret != 0){

3036

errno = ret;

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

3037

2587

perror_plus("Failed to lower privileges permanently");

3038

2588

}

3039

2589

}

3041

2591

free(interfaces_to_take_down);

3042

2592

free(interfaces_hooks);

3043

2593

3044

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

3045

uintmax_t level){

3046

struct dirent **direntries = NULL;

3047

int dret;

3048

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

3049

O_RDONLY

3050

| O_NOFOLLOW

3051

| O_DIRECTORY

3052

| O_PATH));

3053

if(dir_fd == -1){

3054

perror_plus("open");

3055

}

3056

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

3057

notdotentries, alphasort);

3058

if(numentries >= 0){

3059

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

3060

if(debug){

3061

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

3062

dirname, direntries[i]->d_name);

3063

}

3064

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

3065

if(dret == -1){

3066

if(errno == EISDIR){

3067

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

3068

AT_REMOVEDIR);

3069

}

3070

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

3071

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

3072

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

3073

/* Recurse only in this special case */

3074

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

3075

dret = 0;

3076

}

3077

if(dret == -1){

3078

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

3079

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

3080

}

3081

}

3082

free(direntries[i]);

3083

}

3084

3085

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

3086

free(direntries);

3087

if(numentries == -1){

3088

perror_plus("scandirat");

3089

}

3090

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3091

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

3092

perror_plus("rmdir");

3093

}

3094

} else {

3095

perror_plus("scandirat");

3096

}

3097

close(dir_fd);

3098

}

3099

3100

2594

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

3101

2595

if(tempdir != NULL){

3102

clean_dir_at(-1, tempdir, 0);

2596

struct dirent **direntries = NULL;

2597

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

2598

O_NOFOLLOW));

2599

if(tempdir_fd == -1){

2600

perror_plus("open");

2601

} else {

2602

#ifdef __GLIBC__

2603

#if __GLIBC_PREREQ(2, 15)

2604

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

2605

notdotentries, alphasort);

2606

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

2607

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

2608

alphasort);

2609

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

2610

#else /* not __GLIBC__ */

2611

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

2612

alphasort);

2613

#endif /* not __GLIBC__ */

2614

if(numentries >= 0){

2615

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

2616

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

2617

if(ret == -1){

2618

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

2619

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

2620

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

2621

}

2622

}

2623

2624

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

2625

free(direntries);

2626

if(numentries == -1){

2627

perror_plus("scandir");

2628

}

2629

ret = rmdir(tempdir);

2630

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

2631

perror_plus("rmdir");

2632

}

2633

}

2634

TEMP_FAILURE_RETRY(close(tempdir_fd));

2635

}

3103

2636

}

3104

2637

3105

2638

if(quit_now){