/mandos/release : revision 237.7.217

9

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

10

*

11

* Everything else is

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13

14

*

15

* This file is part of Mandos.

16

*

17

* Mandos is free software: you can redistribute it and/or modify it

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* 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.

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*

22

* Mandos is distributed in the hope that it will be useful, but

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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

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* License, or (at your option) any later version.

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*

20

* This program is distributed in the hope that it will be useful, but

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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

*

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29

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

31

30

*/

33

32

/* Needed by GPGME, specifically gpgme_data_seek() */

34

33

#ifndef _LARGEFILE_SOURCE

35

34

#define _LARGEFILE_SOURCE

36

#endif /* not _LARGEFILE_SOURCE */

35

#endif

37

36

#ifndef _FILE_OFFSET_BITS

38

37

#define _FILE_OFFSET_BITS 64

39

#endif /* not _FILE_OFFSET_BITS */

38

#endif

40

39

41

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

42

41

43

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

44

stdout, ferror() */

43

stdout, ferror(), remove() */

45

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

46

45

#include <stddef.h> /* NULL, size_t, ssize_t */

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() */

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,

79

73

*/

80

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

81

75

getuid(), getgid(), seteuid(),

82

setgid(), pause(), _exit(),

83

unlinkat() */

76

setgid(), pause(), _exit() */

84

77

#include <arpa/inet.h> /* inet_pton(), htons() */

85

78

#include <iso646.h> /* not, or, and */

86

79

#include <argp.h> /* struct argp_option, error_t, struct

148

141

static const char sys_class_net[] = "/sys/class/net";

149

142

char *connect_to = NULL;

150

143

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

152

144

uid_t uid = 65534;

153

145

gid_t gid = 65534;

154

146

191

183

perror(print_text);

192

184

}

193

185

194

__attribute__((format (gnu_printf, 2, 3), nonnull))

186

__attribute__((format (gnu_printf, 2, 3)))

195

187

int fprintf_plus(FILE *stream, const char *format, ...){

196

188

va_list ap;

197

189

va_start (ap, format);

206

198

* bytes. "buffer_capacity" is how much is currently allocated,

207

199

* "buffer_length" is how much is already used.

208

200

*/

209

__attribute__((nonnull, warn_unused_result))

210

201

size_t incbuffer(char **buffer, size_t buffer_length,

211

202

size_t buffer_capacity){

212

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

225

216

}

226

217

227

218

/* Add server to set of servers to retry periodically */

228

__attribute__((nonnull, warn_unused_result))

229

219

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

230

220

int af, server **current_server){

231

221

int ret;

240

230

.af = af };

241

231

if(new_server->ip == NULL){

242

232

perror_plus("strdup");

243

free(new_server);

244

233

return false;

245

234

}

246

235

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

247

236

if(ret == -1){

248

237

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

238

return false;

259

239

}

260

240

/* Special case of first server */

262

242

new_server->next = new_server;

263

243

new_server->prev = new_server;

264

244

*current_server = new_server;

245

/* Place the new server last in the list */

265

246

} else {

266

/* Place the new server last in the list */

267

247

new_server->next = *current_server;

268

248

new_server->prev = (*current_server)->prev;

269

249

new_server->prev->next = new_server;

275

255

/*

276

256

* Initialize GPGME.

277

257

*/

278

__attribute__((nonnull, warn_unused_result))

279

static bool init_gpgme(const char * const seckey,

280

const char * const pubkey,

281

const char * const tempdir,

282

mandos_context *mc){

258

static bool init_gpgme(const char *seckey, const char *pubkey,

259

const char *tempdir, mandos_context *mc){

283

260

gpgme_error_t rc;

284

261

gpgme_engine_info_t engine_info;

285

262

286

263

/*

287

264

* Helper function to insert pub and seckey to the engine keyring.

288

265

*/

289

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

290

267

int ret;

291

268

int fd;

292

269

gpgme_data_t pgp_data;

311

288

return false;

312

289

}

313

290

314

ret = close(fd);

291

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

315

292

if(ret == -1){

316

293

perror_plus("close");

317

294

}

373

350

* Decrypt OpenPGP data.

374

351

* Returns -1 on error

375

352

*/

376

__attribute__((nonnull, warn_unused_result))

377

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

378

354

size_t crypto_size,

379

355

char **plaintext,

499

475

return plaintext_length;

500

476

}

501

477

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

__attribute__((warn_unused_result))

510

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

511

479

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

480

if(ret == NULL)

481

ret = "(unknown)";

482

return ret;

513

483

}

514

484

515

485

/* GnuTLS log function callback */

516

__attribute__((nonnull))

517

486

static void debuggnutls(__attribute__((unused)) int level,

518

487

const char* string){

519

488

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

520

489

}

521

490

522

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

523

491

static int init_gnutls_global(const char *pubkeyfilename,

524

492

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

493

mandos_context *mc){

527

494

int ret;

528

unsigned int uret;

529

495

530

496

if(debug){

531

497

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

532

498

}

533

499

500

ret = gnutls_global_init();

501

if(ret != GNUTLS_E_SUCCESS){

502

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

503

safer_gnutls_strerror(ret));

504

return -1;

505

}

506

534

507

if(debug){

535

508

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

536

509

* - GnuTLS manual

544

517

if(ret != GNUTLS_E_SUCCESS){

545

518

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

546

519

safer_gnutls_strerror(ret));

520

gnutls_global_deinit();

547

521

return -1;

548

522

}

549

523

574

548

safer_gnutls_strerror(ret));

575

549

goto globalfail;

576

550

}

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

}

551

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

552

if(ret != GNUTLS_E_SUCCESS){

553

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

554

safer_gnutls_strerror(ret));

555

goto globalfail;

556

}

557

750

558

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

751

559

752

560

return 0;

754

562

globalfail:

755

563

756

564

gnutls_certificate_free_credentials(mc->cred);

565

gnutls_global_deinit();

757

566

gnutls_dh_params_deinit(mc->dh_params);

758

567

return -1;

759

568

}

760

569

761

__attribute__((nonnull, warn_unused_result))

762

570

static int init_gnutls_session(gnutls_session_t *session,

763

571

mandos_context *mc){

764

572

int ret;

811

619

/* ignore client certificate if any. */

812

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

813

621

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

623

814

624

return 0;

815

625

}

816

626

818

628

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

819

629

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

820

630

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

631

/* Called when a Mandos server is found */

1040

__attribute__((nonnull, warn_unused_result))

1041

632

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

1042

633

AvahiIfIndex if_index,

1043

634

int af, mandos_context *mc){

1052

643

int retval = -1;

1053

644

gnutls_session_t session;

1054

645

int pf; /* Protocol family */

1055

bool route_added = false;

1056

646

1057

647

errno = 0;

1058

648

1080

670

bool match = false;

1081

671

{

1082

672

char *interface = NULL;

1083

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

1084

mc->interfaces_size,

1085

interface))){

673

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

674

interface))){

1086

675

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

1087

676

match = true;

1088

677

break;

1117

706

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

1118

707

}

1119

708

1120

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

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

710

if(tcp_sd < 0){

1122

711

int e = errno;

1123

712

perror_plus("socket");

1130

719

goto mandos_end;

1131

720

}

1132

721

722

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

1133

723

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);

724

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

725

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

1137

726

} 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);

727

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

728

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

1141

729

}

1142

730

if(ret < 0 ){

1143

731

int e = errno;

1152

740

goto mandos_end;

1153

741

}

1154

742

if(af == AF_INET6){

1155

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

743

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

1156

744

if(IN6_IS_ADDR_LINKLOCAL

1157

745

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

1158

746

if(if_index == AVAHI_IF_UNSPEC){

1213

801

goto mandos_end;

1214

802

}

1215

803

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;

804

if(af == AF_INET6){

805

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

806

sizeof(struct sockaddr_in6));

807

} else {

808

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

809

sizeof(struct sockaddr_in));

810

}

811

if(ret < 0){

812

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

813

int e = errno;

814

perror_plus("connect");

815

errno = e;

816

}

817

goto mandos_end;

818

}

819

820

if(quit_now){

821

errno = EINTR;

822

goto mandos_end;

1271

823

}

1272

824

1273

825

const char *out = mandos_protocol_version;

1427

979

&decrypted_buffer, mc);

1428

980

if(decrypted_buffer_size >= 0){

1429

981

1430

clearerr(stdout);

1431

982

written = 0;

1432

983

while(written < (size_t) decrypted_buffer_size){

1433

984

if(quit_now){

1449

1000

}

1450

1001

written += (size_t)ret;

1451

1002

}

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

1003

retval = 0;

1463

1004

}

1464

1005

}

1467

1008

1468

1009

mandos_end:

1469

1010

{

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

1011

int e = errno;

1477

1012

free(decrypted_buffer);

1478

1013

free(buffer);

1479

1014

if(tcp_sd >= 0){

1480

ret = close(tcp_sd);

1015

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

1481

1016

}

1482

1017

if(ret == -1){

1483

1018

if(e == 0){

1508

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1509

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1510

1045

flags,

1511

void *mc){

1046

void* mc){

1512

1047

if(r == NULL){

1513

1048

return;

1514

1049

}

1517

1052

timed out */

1518

1053

1519

1054

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1521

1055

return;

1522

1056

}

1523

1057

1568

1102

const char *domain,

1569

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1570

1104

flags,

1571

void *mc){

1105

void* mc){

1572

1106

if(b == NULL){

1573

1107

return;

1574

1108

}

1634

1168

errno = old_errno;

1635

1169

}

1636

1170

1637

__attribute__((nonnull, warn_unused_result))

1638

1171

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

1639

1172

int ret;

1640

int old_errno;

1173

error_t ret_errno;

1641

1174

1642

1175

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

1643

1176

if(s < 0){

1644

old_errno = errno;

1177

ret_errno = errno;

1645

1178

perror_plus("socket");

1646

errno = old_errno;

1179

errno = ret_errno;

1647

1180

return false;

1648

1181

}

1649

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

1650

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

1182

strcpy(ifr->ifr_name, ifname);

1651

1183

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

1184

if(ret == -1){

1653

1185

if(debug){

1654

old_errno = errno;

1186

ret_errno = errno;

1655

1187

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1188

errno = ret_errno;

1657

1189

}

1658

1190

return false;

1659

1191

}

1660

1192

return true;

1661

1193

}

1662

1194

1663

__attribute__((nonnull, warn_unused_result))

1664

1195

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

1665

1196

1666

1197

/* Reject the loopback device */

1708

1239

* corresponds to an acceptable network device.

1709

1240

* (This function is passed to scandir(3) as a filter function.)

1710

1241

*/

1711

__attribute__((nonnull, warn_unused_result))

1712

1242

int good_interface(const struct dirent *if_entry){

1713

1243

if(if_entry->d_name[0] == '.'){

1714

1244

return 0;

1732

1262

/*

1733

1263

* This function determines if a network interface is up.

1734

1264

*/

1735

__attribute__((nonnull, warn_unused_result))

1736

1265

bool interface_is_up(const char *interface){

1737

1266

struct ifreq ifr;

1738

1267

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

1749

1278

/*

1750

1279

* This function determines if a network interface is running

1751

1280

*/

1752

__attribute__((nonnull, warn_unused_result))

1753

1281

bool interface_is_running(const char *interface){

1754

1282

struct ifreq ifr;

1755

1283

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

1763

1291

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1764

1292

}

1765

1293

1766

__attribute__((nonnull, pure, warn_unused_result))

1767

1294

int notdotentries(const struct dirent *direntry){

1768

1295

/* Skip "." and ".." */

1769

1296

if(direntry->d_name[0] == '.'

1776

1303

}

1777

1304

1778

1305

/* Is this directory entry a runnable program? */

1779

__attribute__((nonnull, warn_unused_result))

1780

1306

int runnable_hook(const struct dirent *direntry){

1781

1307

int ret;

1782

1308

size_t sret;

1790

1316

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1791

1317

"abcdefghijklmnopqrstuvwxyz"

1792

1318

"0123456789"

1793

"_.-");

1319

"_-");

1794

1320

if((direntry->d_name)[sret] != '\0'){

1795

1321

/* Contains non-allowed characters */

1796

1322

if(debug){

1800

1326

return 0;

1801

1327

}

1802

1328

1803

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1329

char *fullname = NULL;

1330

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1331

if(ret < 0){

1332

perror_plus("asprintf");

1333

return 0;

1334

}

1335

1336

ret = stat(fullname, &st);

1804

1337

if(ret == -1){

1805

1338

if(debug){

1806

1339

perror_plus("Could not stat hook");

1830

1363

return 1;

1831

1364

}

1832

1365

1833

__attribute__((nonnull, warn_unused_result))

1834

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

1367

mandos_context *mc){

1836

1368

int ret;

1840

1372

1841

1373

while(true){

1842

1374

if(mc->current_server == NULL){

1843

if(debug){

1375

if (debug){

1844

1376

fprintf_plus(stderr, "Wait until first server is found."

1845

1377

" No timeout!\n");

1846

1378

}

1847

1379

ret = avahi_simple_poll_iterate(s, -1);

1848

1380

} else {

1849

if(debug){

1381

if (debug){

1850

1382

fprintf_plus(stderr, "Check current_server if we should run"

1851

1383

" it, or wait\n");

1852

1384

}

1869

1401

- ((intmax_t)waited_time.tv_sec * 1000))

1870

1402

- ((intmax_t)waited_time.tv_nsec / 1000000));

1871

1403

1872

if(debug){

1404

if (debug){

1873

1405

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1874

1406

block_time);

1875

1407

}

1897

1429

ret = avahi_simple_poll_iterate(s, (int)block_time);

1898

1430

}

1899

1431

if(ret != 0){

1900

if(ret > 0 or errno != EINTR){

1432

if (ret > 0 or errno != EINTR){

1901

1433

return (ret != 1) ? ret : 0;

1902

1434

}

1903

1435

}

1904

1436

}

1905

1437

}

1906

1438

1907

__attribute__((nonnull))

1908

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

1439

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

1440

error_t raise_privileges(void){

1441

error_t old_errno = errno;

1442

error_t ret_errno = 0;

1443

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

1444

ret_errno = errno;

1445

perror_plus("seteuid");

1446

}

1447

errno = old_errno;

1448

return ret_errno;

1449

}

1450

1451

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

1452

error_t raise_privileges_permanently(void){

1453

error_t old_errno = errno;

1454

error_t ret_errno = raise_privileges();

1455

if(ret_errno != 0){

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

error_t lower_privileges(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = 0;

1471

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

1472

ret_errno = errno;

1473

perror_plus("seteuid");

1474

}

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

1479

/* Lower privileges permanently */

1480

error_t lower_privileges_permanently(void){

1481

error_t old_errno = errno;

1482

error_t ret_errno = 0;

1483

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

1484

ret_errno = errno;

1485

perror_plus("setuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

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

1909

1492

const float delay){

1910

struct dirent **direntries = NULL;

1911

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1914

if(hookdir_fd == -1){

1915

if(errno == ENOENT){

1916

if(debug){

1917

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1918

" found\n", hookdir);

1919

}

1920

} else {

1921

perror_plus("open");

1922

}

1923

return;

1924

}

1925

}

1926

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

1927

runnable_hook, alphasort);

1493

struct dirent **direntries;

1494

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

1495

alphasort);

1928

1496

if(numhooks == -1){

1929

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

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

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1943

direntry->d_name);

1497

if(errno == ENOENT){

1498

if(debug){

1499

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1500

" found\n", hookdir);

1501

}

1502

} else {

1503

perror_plus("scandir");

1944

1504

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

ret = setenv("DEVICE", interface, 1);

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

ret = setenv("MODE", mode, 1);

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

ret = asprintf(&delaystring, "%f", (double)delay);

1990

if(ret == -1){

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1508

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

1509

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

1510

direntry = direntries[i];

1511

char *fullname = NULL;

1512

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1513

if(ret < 0){

1991

1514

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

ret = setenv("DELAY", delaystring, 1);

1995

if(ret == -1){

1515

continue;

1516

}

1517

if(debug){

1518

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1519

direntry->d_name);

1520

}

1521

pid_t hook_pid = fork();

1522

if(hook_pid == 0){

1523

/* Child */

1524

/* Raise privileges */

1525

raise_privileges_permanently();

1526

/* Set group */

1527

errno = 0;

1528

ret = setgid(0);

1529

if(ret == -1){

1530

perror_plus("setgid");

1531

}

1532

/* Reset supplementary groups */

1533

errno = 0;

1534

ret = setgroups(0, NULL);

1535

if(ret == -1){

1536

perror_plus("setgroups");

1537

}

1538

dup2(devnull, STDIN_FILENO);

1539

close(devnull);

1540

dup2(STDERR_FILENO, STDOUT_FILENO);

1541

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

1542

if(ret == -1){

1543

perror_plus("setenv");

1544

_exit(EX_OSERR);

1545

}

1546

ret = setenv("DEVICE", interface, 1);

1547

if(ret == -1){

1548

perror_plus("setenv");

1549

_exit(EX_OSERR);

1550

}

1551

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1552

if(ret == -1){

1553

perror_plus("setenv");

1554

_exit(EX_OSERR);

1555

}

1556

ret = setenv("MODE", mode, 1);

1557

if(ret == -1){

1558

perror_plus("setenv");

1559

_exit(EX_OSERR);

1560

}

1561

char *delaystring;

1562

ret = asprintf(&delaystring, "%f", delay);

1563

if(ret == -1){

1564

perror_plus("asprintf");

1565

_exit(EX_OSERR);

1566

}

1567

ret = setenv("DELAY", delaystring, 1);

1568

if(ret == -1){

1569

free(delaystring);

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1996

1573

free(delaystring);

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

ret = setenv("CONNECT", connect_to, 1);

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

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

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

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

1574

if(connect_to != NULL){

1575

ret = setenv("CONNECT", connect_to, 1);

1576

if(ret == -1){

1577

perror_plus("setenv");

1578

_exit(EX_OSERR);

1579

}

1580

}

1581

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1582

perror_plus("execl");

1583

_exit(EXIT_FAILURE);

1584

}

2065

1585

} else {

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

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

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

1586

int status;

1587

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

1588

perror_plus("waitpid");

1589

free(fullname);

1590

continue;

1591

}

1592

if(WIFEXITED(status)){

1593

if(WEXITSTATUS(status) != 0){

1594

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

1595

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

1596

WEXITSTATUS(status));

1597

free(fullname);

1598

continue;

1599

}

1600

} else if(WIFSIGNALED(status)){

1601

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

1602

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

1603

WTERMSIG(status));

1604

free(fullname);

1605

continue;

1606

} else {

1607

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

1608

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

1609

free(fullname);

1610

continue;

1611

}

1612

}

1613

free(fullname);

1614

if(debug){

1615

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

1616

direntry->d_name);

1617

}

1618

}

1619

close(devnull);

1620

}

1621

return true;

2085

1622

}

2086

1623

2087

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2091

int ret;

1624

error_t bring_up_interface(const char *const interface,

1625

const float delay){

1626

int sd = -1;

1627

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

2092

1630

struct ifreq network;

2093

1631

unsigned int if_index = if_nametoindex(interface);

2094

1632

if(if_index == 0){

2103

1641

}

2104

1642

2105

1643

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

1644

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

2109

1645

ret_errno = errno;

2110

1646

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

2111

1647

"\"%s\"\n", interface);

2112

errno = old_errno;

2113

1648

return ret_errno;

2114

1649

}

2115

network.ifr_flags |= IFF_UP; /* set flag */

1650

network.ifr_flags |= IFF_UP;

2116

1651

2117

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

2118

if(sd == -1){

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

2119

1654

ret_errno = errno;

2120

1655

perror_plus("socket");

2121

1656

errno = old_errno;

2122

1657

return ret_errno;

2123

1658

}

2124

1659

2125

1660

if(quit_now){

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

1661

close(sd);

2130

1662

errno = old_errno;

2131

1663

return EINTR;

2132

1664

}

2136

1668

interface);

2137

1669

}

2138

1670

2139

/* Raise privileges */

2140

ret_errno = raise_privileges();

2141

if(ret_errno != 0){

2142

errno = ret_errno;

2143

perror_plus("Failed to raise privileges");

2144

}

1671

/* Raise priviliges */

1672

raise_privileges();

2145

1673

2146

1674

#ifdef __linux__

2147

int ret_linux;

2148

bool restore_loglevel = false;

2149

if(ret_errno == 0){

2150

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2151

messages about the network interface to mess up the prompt */

2152

ret_linux = klogctl(8, NULL, 5);

2153

if(ret_linux == -1){

2154

perror_plus("klogctl");

2155

} else {

2156

restore_loglevel = true;

2157

}

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

messages about the network interface to mess up the prompt */

1677

int ret_linux = klogctl(8, NULL, 5);

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

2158

1682

}

2159

1683

#endif /* __linux__ */

2160

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2161

ioctl_errno = errno;

1684

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1685

ret_errno = errno;

2162

1686

#ifdef __linux__

2163

1687

if(restore_loglevel){

2164

1688

ret_linux = klogctl(7, NULL, 0);

2168

1692

}

2169

1693

#endif /* __linux__ */

2170

1694

2171

/* If raise_privileges() succeeded above */

2172

if(ret_errno == 0){

2173

/* Lower privileges */

2174

ret_errno = lower_privileges();

2175

if(ret_errno != 0){

2176

errno = ret_errno;

2177

perror_plus("Failed to lower privileges");

2178

}

2179

}

1695

/* Lower privileges */

1696

lower_privileges();

2180

1697

2181

1698

/* Close the socket */

2182

ret = close(sd);

1699

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

2183

1700

if(ret == -1){

2184

1701

perror_plus("close");

2185

1702

}

2186

1703

2187

1704

if(ret_setflags == -1){

2188

errno = ioctl_errno;

1705

errno = ret_errno;

2189

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2190

1707

errno = old_errno;

2191

return ioctl_errno;

1708

return ret_errno;

2192

1709

}

2193

1710

} else if(debug){

2194

1711

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

2197

1714

2198

1715

/* Sleep checking until interface is running.

2199

1716

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

2200

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

1717

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

2201

1718

if(interface_is_running(interface)){

2202

1719

break;

2203

1720

}

2212

1729

return 0;

2213

1730

}

2214

1731

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

1732

error_t take_down_interface(const char *const interface){

1733

error_t old_errno = errno;

2218

1734

struct ifreq network;

2219

1735

unsigned int if_index = if_nametoindex(interface);

2220

1736

if(if_index == 0){

2223

1739

return ENXIO;

2224

1740

}

2225

1741

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

1742

error_t ret_errno = 0;

2228

1743

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

2229

1744

ret_errno = errno;

2230

1745

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

2231

1746

"\"%s\"\n", interface);

2232

errno = old_errno;

2233

1747

return ret_errno;

2234

1748

}

2235

1749

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2236

1750

2237

1751

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

2238

if(sd == -1){

1752

if(sd < 0){

2239

1753

ret_errno = errno;

2240

1754

perror_plus("socket");

2241

1755

errno = old_errno;

2247

1761

interface);

2248

1762

}

2249

1763

2250

/* Raise privileges */

2251

ret_errno = raise_privileges();

2252

if(ret_errno != 0){

2253

errno = ret_errno;

2254

perror_plus("Failed to raise privileges");

2255

}

1764

/* Raise priviliges */

1765

raise_privileges();

2256

1766

2257

1767

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2258

ioctl_errno = errno;

1768

ret_errno = errno;

2259

1769

2260

/* If raise_privileges() succeeded above */

2261

if(ret_errno == 0){

2262

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2268

}

1770

/* Lower privileges */

1771

lower_privileges();

2269

1772

2270

1773

/* Close the socket */

2271

int ret = close(sd);

1774

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

2272

1775

if(ret == -1){

2273

1776

perror_plus("close");

2274

1777

}

2275

1778

2276

1779

if(ret_setflags == -1){

2277

errno = ioctl_errno;

1780

errno = ret_errno;

2278

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2279

1782

errno = old_errno;

2280

return ioctl_errno;

1783

return ret_errno;

2281

1784

}

2282

1785

} else if(debug){

2283

1786

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

2289

1792

}

2290

1793

2291

1794

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 };

1795

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

1796

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

1797

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

1798

.interfaces = NULL, .interfaces_size = 0 };

2297

1799

AvahiSServiceBrowser *sb = NULL;

2298

1800

error_t ret_errno;

2299

1801

int ret;

2302

1804

int exitcode = EXIT_SUCCESS;

2303

1805

char *interfaces_to_take_down = NULL;

2304

1806

size_t interfaces_to_take_down_size = 0;

2305

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

2306

char old_tempdir[] = "/tmp/mandosXXXXXX";

2307

char *tempdir = NULL;

1807

char tempdir[] = "/tmp/mandosXXXXXX";

1808

bool tempdir_created = false;

2308

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2309

1810

const char *seckey = PATHDIR "/" SECKEY;

2310

1811

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

1812

char *interfaces_hooks = NULL;

2313

1813

2314

1814

bool gnutls_initialized = false;

2367

1867

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

2368

1868

" Diffie-Hellman key exchange",

2369

1869

.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

1870

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

2376

1871

.arg = "STRING",

2377

1872

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

2432

1927

}

2433

1928

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

2434

1929

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2438

1930

case 130: /* --priority */

2439

1931

mc.priority = arg;

2440

1932

break;

2480

1972

.args_doc = "",

2481

1973

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

2482

1974

" 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){

1975

ret = argp_parse(&argp, argc, argv,

1976

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1977

switch(ret){

2486

1978

case 0:

2487

1979

break;

2488

1980

case ENOMEM:

2489

1981

default:

2490

errno = ret_errno;

1982

errno = ret;

2491

1983

perror_plus("argp_parse");

2492

1984

exitcode = EX_OSERR;

2493

1985

goto end;

2496

1988

goto end;

2497

1989

}

2498

1990

}

2499

1991

2500

1992

{

2501

1993

/* Work around Debian bug #633582:

2502

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

1994

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

2503

1995

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

2509

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2510

1998

struct stat st;

2511

1999

2512

2000

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2526

2014

}

2527

2015

}

2528

2016

}

2529

close(seckey_fd);

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2530

2018

}

2531

2019

}

2532

2020

2533

2021

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

2534

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2535

2023

if(pubkey_fd == -1){

2547

2035

}

2548

2036

}

2549

2037

}

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

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2576

2042

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

2581

}

2043

lower_privileges();

2582

2044

}

2583

2045

}

2584

2046

2610

2072

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2611

2073

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2612

2074

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

2075

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2615

2079

}

2616

2080

2617

2081

if(not debug){

2695

2159

2696

2160

/* If no interfaces were specified, make a list */

2697

2161

if(mc.interfaces == NULL){

2698

struct dirent **direntries = NULL;

2162

struct dirent **direntries;

2699

2163

/* Look for any good interfaces */

2700

2164

ret = scandir(sys_class_net, &direntries, good_interface,

2701

2165

alphasort);

2707

2171

if(ret_errno != 0){

2708

2172

errno = ret_errno;

2709

2173

perror_plus("argz_add");

2710

free(direntries[i]);

2711

2174

continue;

2712

2175

}

2713

2176

if(debug){

2714

2177

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

2715

2178

direntries[i]->d_name);

2716

2179

}

2717

free(direntries[i]);

2718

2180

}

2719

2181

free(direntries);

2720

2182

} else {

2721

if(ret == 0){

2722

free(direntries);

2723

}

2183

free(direntries);

2724

2184

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

2725

2185

exitcode = EXIT_FAILURE;

2726

2186

goto end;

2749

2209

break;

2750

2210

}

2751

2211

bool interface_was_up = interface_is_up(interface);

2752

errno = bring_up_interface(interface, delay);

2212

ret = bring_up_interface(interface, delay);

2753

2213

if(not interface_was_up){

2754

if(errno != 0){

2755

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

2756

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

2214

if(ret != 0){

2215

errno = ret;

2216

perror_plus("Failed to bring up interface");

2757

2217

} else {

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2762

2223

perror_plus("argz_add");

2763

2224

}

2764

2225

}

2782

2243

goto end;

2783

2244

}

2784

2245

2785

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

2246

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

2786

2247

if(ret == -1){

2787

2248

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

2788

2249

exitcode = EX_UNAVAILABLE;

2795

2256

goto end;

2796

2257

}

2797

2258

2798

/* Try /run/tmp before /tmp */

2799

tempdir = mkdtemp(run_tempdir);

2800

if(tempdir == NULL and errno == ENOENT){

2801

if(debug){

2802

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2803

run_tempdir, old_tempdir);

2804

}

2805

tempdir = mkdtemp(old_tempdir);

2806

}

2807

if(tempdir == NULL){

2259

if(mkdtemp(tempdir) == NULL){

2808

2260

perror_plus("mkdtemp");

2809

2261

goto end;

2810

2262

}

2263

tempdir_created = true;

2811

2264

2812

2265

if(quit_now){

2813

2266

goto end;

2888

2341

sleep((unsigned int)retry_interval);

2889

2342

}

2890

2343

2891

if(not quit_now){

2344

if (not quit_now){

2892

2345

exitcode = EXIT_SUCCESS;

2893

2346

}

2894

2347

2910

2363

2911

2364

/* Allocate a new server */

2912

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

2366

&config, NULL, NULL, &ret_errno);

2914

2367

2915

2368

/* Free the Avahi configuration data */

2916

2369

avahi_server_config_free(&config);

2919

2372

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

2920

2373

if(mc.server == NULL){

2921

2374

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

2922

avahi_strerror(ret));

2375

avahi_strerror(ret_errno));

2923

2376

exitcode = EX_UNAVAILABLE;

2924

2377

goto end;

2925

2378

}

2949

2402

if(debug){

2950

2403

fprintf_plus(stderr, "Starting Avahi loop search\n");

2951

2404

}

2952

2405

2953

2406

ret = avahi_loop_with_timeout(simple_poll,

2954

2407

(int)(retry_interval * 1000), &mc);

2955

2408

if(debug){

2960

2413

end:

2961

2414

2962

2415

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

}

2416

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

2970

2417

}

2971

2418

2972

2419

/* Cleanup things */

2983

2430

2984

2431

if(gnutls_initialized){

2985

2432

gnutls_certificate_free_credentials(mc.cred);

2433

gnutls_global_deinit();

2986

2434

gnutls_dh_params_deinit(mc.dh_params);

2987

2435

}

2988

2436

2996

2444

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

2997

2445

while(mc.current_server != NULL){

2998

2446

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

2447

free(mc.current_server);

3008

2448

mc.current_server = next;

3009

2449

}

3010

2450

}

3011

2451

3012

/* Re-raise privileges */

2452

/* Re-raise priviliges */

3013

2453

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

3017

perror_plus("Failed to raise privileges");

3018

} else {

3019

3020

/* Run network hooks */

3021

run_network_hooks("stop", interfaces_hooks != NULL ?

3022

interfaces_hooks : "", delay);

3023

3024

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

3025

{

3026

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;

3033

perror_plus("Failed to take down interface");

3034

}

3035

}

3036

if(debug and (interfaces_to_take_down == NULL)){

3037

fprintf_plus(stderr, "No interfaces needed to be taken"

3038

" down\n");

3039

}

3040

}

3041

}

3042

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

3046

perror_plus("Failed to lower privileges permanently");

3047

}

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

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

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

2470

}

2471

}

2472

if(debug and (interfaces_to_take_down == NULL)){

2473

fprintf_plus(stderr, "No interfaces needed to be taken"

2474

" down\n");

2475

}

2476

}

2477

2478

lower_privileges_permanently();

3048

2479

}

3049

2480

3050

2481

free(interfaces_to_take_down);

3051

2482

free(interfaces_hooks);

3052

2483

3053

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

3054

uintmax_t level){

2484

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

2485

if(tempdir_created){

3055

2486

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){

2487

struct dirent *direntry = NULL;

2488

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

2489

alphasort);

2490

if (numentries > 0){

3068

2491

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

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

3110

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

2492

direntry = direntries[i];

2493

char *fullname = NULL;

2494

ret = asprintf(&fullname, "%s/%s", tempdir,

2495

direntry->d_name);

2496

if(ret < 0){

2497

perror_plus("asprintf");

2498

continue;

2499

}

2500

ret = remove(fullname);

2501

if(ret == -1){

2502

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2503

strerror(errno));

2504

}

2505

free(fullname);

2506

}

2507

}

2508

2509

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

2510

free(direntries);

2511

if (numentries == -1){

2512

perror_plus("scandir");

2513

}

2514

ret = rmdir(tempdir);

2515

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

2516

perror_plus("rmdir");

2517

}

3112

2518

}

3113

2519

3114

2520

if(quit_now){