/mandos/trunk : revision 666

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

10

*

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* 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

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* (at your option) any later version.

21

*

22

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

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

17

* published by the Free Software Foundation, either version 3 of the

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

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*

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* 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

*

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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

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* <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,

57

55

opendir(), DIR */

58

56

#include <sys/stat.h> /* open(), S_ISREG */

59

57

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

60

inet_pton(), connect(),

61

getnameinfo() */

62

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

58

inet_pton(), connect() */

59

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

63

60

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

64

61

*/

65

62

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

66

63

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,

64

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

72

65

program_invocation_short_name */

73

66

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

74

67

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

79

72

*/

80

73

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

81

74

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

82

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

83

unlinkat() */

84

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

75

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

76

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

85

77

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

86

78

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

87

79

argp_state, struct argp,

99

91

argz_delete(), argz_append(),

100

92

argz_stringify(), argz_add(),

101

93

argz_count() */

102

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

103

EAI_SYSTEM, gai_strerror() */

104

94

105

95

#ifdef __linux__

106

96

#include <sys/klog.h> /* klogctl() */

148

138

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

149

139

char *connect_to = NULL;

150

140

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

152

141

uid_t uid = 65534;

153

142

gid_t gid = 65534;

154

143

191

180

perror(print_text);

192

181

}

193

182

194

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

183

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

195

184

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

196

185

va_list ap;

197

186

va_start (ap, format);

206

195

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

207

196

* "buffer_length" is how much is already used.

208

197

*/

209

__attribute__((nonnull, warn_unused_result))

210

198

size_t incbuffer(char **buffer, size_t buffer_length,

211

199

size_t buffer_capacity){

212

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

225

213

}

226

214

227

215

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

228

__attribute__((nonnull, warn_unused_result))

229

216

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

230

217

int af, server **current_server){

231

218

int ret;

240

227

.af = af };

241

228

if(new_server->ip == NULL){

242

229

perror_plus("strdup");

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

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

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

258

230

return false;

259

231

}

260

232

/* Special case of first server */

262

234

new_server->next = new_server;

263

235

new_server->prev = new_server;

264

236

*current_server = new_server;

237

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

265

238

} else {

266

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

267

239

new_server->next = *current_server;

268

240

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

269

241

new_server->prev->next = new_server;

270

242

(*current_server)->prev = new_server;

271

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

return false;

248

}

272

249

return true;

273

250

}

274

251

275

252

/*

276

253

* Initialize GPGME.

277

254

*/

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){

255

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

256

const char *tempdir, mandos_context *mc){

283

257

gpgme_error_t rc;

284

258

gpgme_engine_info_t engine_info;

285

259

286

260

/*

287

261

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

288

262

*/

289

bool import_key(const char * const filename){

263

bool import_key(const char *filename){

290

264

int ret;

291

265

int fd;

292

266

gpgme_data_t pgp_data;

311

285

return false;

312

286

}

313

287

314

ret = close(fd);

288

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

315

289

if(ret == -1){

316

290

perror_plus("close");

317

291

}

373

347

* Decrypt OpenPGP data.

374

348

* Returns -1 on error

375

349

*/

376

__attribute__((nonnull, warn_unused_result))

377

350

static ssize_t pgp_packet_decrypt(const char *cryptotext,

378

351

size_t crypto_size,

379

352

char **plaintext,

499

472

return plaintext_length;

500

473

}

501

474

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){

475

static const char * safer_gnutls_strerror(int value){

511

476

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

477

if(ret == NULL)

478

ret = "(unknown)";

479

return ret;

513

480

}

514

481

515

482

/* GnuTLS log function callback */

516

__attribute__((nonnull))

517

483

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

518

484

const char* string){

519

485

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

520

486

}

521

487

522

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

523

488

static int init_gnutls_global(const char *pubkeyfilename,

524

489

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

490

mandos_context *mc){

527

491

int ret;

528

unsigned int uret;

529

492

530

493

if(debug){

531

494

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

532

495

}

533

496

497

ret = gnutls_global_init();

498

if(ret != GNUTLS_E_SUCCESS){

499

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

500

safer_gnutls_strerror(ret));

501

return -1;

502

}

503

534

504

if(debug){

535

505

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

536

506

* - GnuTLS manual

544

514

if(ret != GNUTLS_E_SUCCESS){

545

515

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

546

516

safer_gnutls_strerror(ret));

517

gnutls_global_deinit();

547

518

return -1;

548

519

}

549

520

574

545

safer_gnutls_strerror(ret));

575

546

goto globalfail;

576

547

}

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

}

548

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

549

if(ret != GNUTLS_E_SUCCESS){

550

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

551

safer_gnutls_strerror(ret));

552

goto globalfail;

553

}

554

750

555

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

751

556

752

557

return 0;

754

559

globalfail:

755

560

756

561

gnutls_certificate_free_credentials(mc->cred);

562

gnutls_global_deinit();

757

563

gnutls_dh_params_deinit(mc->dh_params);

758

564

return -1;

759

565

}

760

566

761

__attribute__((nonnull, warn_unused_result))

762

567

static int init_gnutls_session(gnutls_session_t *session,

763

568

mandos_context *mc){

764

569

int ret;

811

616

/* ignore client certificate if any. */

812

617

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

813

618

619

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

620

814

621

return 0;

815

622

}

816

623

818

625

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

819

626

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

820

627

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

628

/* Called when a Mandos server is found */

1040

__attribute__((nonnull, warn_unused_result))

1041

629

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

1042

630

AvahiIfIndex if_index,

1043

631

int af, mandos_context *mc){

1044

632

int ret, tcp_sd = -1;

1045

633

ssize_t sret;

1046

struct sockaddr_storage to;

634

union {

635

struct sockaddr_in in;

636

struct sockaddr_in6 in6;

637

} to;

1047

638

char *buffer = NULL;

1048

639

char *decrypted_buffer = NULL;

1049

640

size_t buffer_length = 0;

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

to.in6.sin6_family = (sa_family_t)af;

725

ret = inet_pton(af, ip, &to.in6.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

to.in.sin_family = (sa_family_t)af;

728

ret = inet_pton(af, ip, &to.in.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);

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

743

to.in6.sin6_port = htons(port);

744

#ifdef __GNUC__

745

#pragma GCC diagnostic push

746

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

747

#endif

748

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

749

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */

750

#ifdef __GNUC__

751

#pragma GCC diagnostic pop

752

#endif

1158

753

if(if_index == AVAHI_IF_UNSPEC){

1159

754

fprintf_plus(stderr, "An IPv6 link-local address is"

1160

755

" incomplete without a network interface\n");

1162

757

goto mandos_end;

1163

758

}

1164

759

/* Set the network interface number as scope */

1165

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

760

to.in6.sin6_scope_id = (uint32_t)if_index;

1166

761

}

1167

762

} else {

1168

((struct sockaddr_in *)&to)->sin_port = htons(port);

763

to.in.sin_port = htons(port);

1169

764

}

1170

765

1171

766

if(quit_now){

1188

783

}

1189

784

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1190

785

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1191

if(af == AF_INET6){

1192

ret = getnameinfo((struct sockaddr *)&to,

1193

sizeof(struct sockaddr_in6),

1194

addrstr, sizeof(addrstr), NULL, 0,

1195

NI_NUMERICHOST);

1196

} else {

1197

ret = getnameinfo((struct sockaddr *)&to,

1198

sizeof(struct sockaddr_in),

1199

addrstr, sizeof(addrstr), NULL, 0,

1200

NI_NUMERICHOST);

1201

}

1202

if(ret == EAI_SYSTEM){

1203

perror_plus("getnameinfo");

1204

} else if(ret != 0) {

1205

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

1206

} else if(strcmp(addrstr, ip) != 0){

1207

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

1208

}

1209

}

1210

1211

if(quit_now){

1212

errno = EINTR;

1213

goto mandos_end;

1214

}

1215

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;

786

const char *pcret;

787

if(af == AF_INET6){

788

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

789

sizeof(addrstr));

790

} else {

791

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

792

sizeof(addrstr));

793

}

794

if(pcret == NULL){

795

perror_plus("inet_ntop");

796

} else {

797

if(strcmp(addrstr, ip) != 0){

798

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

799

}

800

}

801

}

802

803

if(quit_now){

804

errno = EINTR;

805

goto mandos_end;

806

}

807

808

if(af == AF_INET6){

809

ret = connect(tcp_sd, &to.in6, sizeof(to));

810

} else {

811

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

812

}

813

if(ret < 0){

814

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

815

int e = errno;

816

perror_plus("connect");

817

errno = e;

818

}

819

goto mandos_end;

820

}

821

822

if(quit_now){

823

errno = EINTR;

824

goto mandos_end;

1271

825

}

1272

826

1273

827

const char *out = mandos_protocol_version;

1427

981

&decrypted_buffer, mc);

1428

982

if(decrypted_buffer_size >= 0){

1429

983

1430

clearerr(stdout);

1431

984

written = 0;

1432

985

while(written < (size_t) decrypted_buffer_size){

1433

986

if(quit_now){

1449

1002

}

1450

1003

written += (size_t)ret;

1451

1004

}

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

1005

retval = 0;

1463

1006

}

1464

1007

}

1467

1010

1468

1011

mandos_end:

1469

1012

{

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

1013

int e = errno;

1477

1014

free(decrypted_buffer);

1478

1015

free(buffer);

1479

1016

if(tcp_sd >= 0){

1480

ret = close(tcp_sd);

1017

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

1481

1018

}

1482

1019

if(ret == -1){

1483

1020

if(e == 0){

1508

1045

AVAHI_GCC_UNUSED AvahiStringList *txt,

1509

1046

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1510

1047

flags,

1511

void *mc){

1048

void* mc){

1512

1049

if(r == NULL){

1513

1050

return;

1514

1051

}

1517

1054

timed out */

1518

1055

1519

1056

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1521

1057

return;

1522

1058

}

1523

1059

1568

1104

const char *domain,

1569

1105

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1570

1106

flags,

1571

void *mc){

1107

void* mc){

1572

1108

if(b == NULL){

1573

1109

return;

1574

1110

}

1634

1170

errno = old_errno;

1635

1171

}

1636

1172

1637

__attribute__((nonnull, warn_unused_result))

1638

1173

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

1639

1174

int ret;

1640

int old_errno;

1175

error_t ret_errno;

1641

1176

1642

1177

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

1643

1178

if(s < 0){

1644

old_errno = errno;

1179

ret_errno = errno;

1645

1180

perror_plus("socket");

1646

errno = old_errno;

1181

errno = ret_errno;

1647

1182

return false;

1648

1183

}

1649

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

1650

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

1184

strcpy(ifr->ifr_name, ifname);

1651

1185

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

1186

if(ret == -1){

1653

1187

if(debug){

1654

old_errno = errno;

1188

ret_errno = errno;

1655

1189

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1190

errno = ret_errno;

1657

1191

}

1658

1192

return false;

1659

1193

}

1660

1194

return true;

1661

1195

}

1662

1196

1663

__attribute__((nonnull, warn_unused_result))

1664

1197

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

1665

1198

1666

1199

/* Reject the loopback device */

1708

1241

* corresponds to an acceptable network device.

1709

1242

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

1710

1243

*/

1711

__attribute__((nonnull, warn_unused_result))

1712

1244

int good_interface(const struct dirent *if_entry){

1713

1245

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

1714

1246

return 0;

1732

1264

/*

1733

1265

* This function determines if a network interface is up.

1734

1266

*/

1735

__attribute__((nonnull, warn_unused_result))

1736

1267

bool interface_is_up(const char *interface){

1737

1268

struct ifreq ifr;

1738

1269

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

1749

1280

/*

1750

1281

* This function determines if a network interface is running

1751

1282

*/

1752

__attribute__((nonnull, warn_unused_result))

1753

1283

bool interface_is_running(const char *interface){

1754

1284

struct ifreq ifr;

1755

1285

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

1763

1293

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

1764

1294

}

1765

1295

1766

__attribute__((nonnull, pure, warn_unused_result))

1767

1296

int notdotentries(const struct dirent *direntry){

1768

1297

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

1769

1298

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

1776

1305

}

1777

1306

1778

1307

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

1779

__attribute__((nonnull, warn_unused_result))

1780

1308

int runnable_hook(const struct dirent *direntry){

1781

1309

int ret;

1782

1310

size_t sret;

1790

1318

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

1791

1319

"abcdefghijklmnopqrstuvwxyz"

1792

1320

"0123456789"

1793

"_.-");

1321

"_-");

1794

1322

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

1795

1323

/* Contains non-allowed characters */

1796

1324

if(debug){

1800

1328

return 0;

1801

1329

}

1802

1330

1803

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

1331

char *fullname = NULL;

1332

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

1333

if(ret < 0){

1334

perror_plus("asprintf");

1335

return 0;

1336

}

1337

1338

ret = stat(fullname, &st);

1804

1339

if(ret == -1){

1805

1340

if(debug){

1806

1341

perror_plus("Could not stat hook");

1830

1365

return 1;

1831

1366

}

1832

1367

1833

__attribute__((nonnull, warn_unused_result))

1834

1368

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

1369

mandos_context *mc){

1836

1370

int ret;

1840

1374

1841

1375

while(true){

1842

1376

if(mc->current_server == NULL){

1843

if(debug){

1377

if (debug){

1844

1378

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

1845

1379

" No timeout!\n");

1846

1380

}

1847

1381

ret = avahi_simple_poll_iterate(s, -1);

1848

1382

} else {

1849

if(debug){

1383

if (debug){

1850

1384

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

1851

1385

" it, or wait\n");

1852

1386

}

1869

1403

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

1870

1404

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

1871

1405

1872

if(debug){

1406

if (debug){

1873

1407

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

1874

1408

block_time);

1875

1409

}

1897

1431

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

1898

1432

}

1899

1433

if(ret != 0){

1900

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

1434

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

1901

1435

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

1902

1436

}

1903

1437

}

1904

1438

}

1905

1439

}

1906

1440

1907

__attribute__((nonnull))

1908

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

1441

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

1442

error_t raise_privileges(void){

1443

error_t old_errno = errno;

1444

error_t ret_errno = 0;

1445

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

1446

ret_errno = errno;

1447

perror_plus("seteuid");

1448

}

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

1453

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

1454

error_t raise_privileges_permanently(void){

1455

error_t old_errno = errno;

1456

error_t ret_errno = raise_privileges();

1457

if(ret_errno != 0){

1458

errno = old_errno;

1459

return ret_errno;

1460

}

1461

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

1462

ret_errno = errno;

1463

perror_plus("seteuid");

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

error_t lower_privileges(void){

1471

error_t old_errno = errno;

1472

error_t ret_errno = 0;

1473

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

1474

ret_errno = errno;

1475

perror_plus("seteuid");

1476

}

1477

errno = old_errno;

1478

return ret_errno;

1479

}

1480

1481

/* Lower privileges permanently */

1482

error_t lower_privileges_permanently(void){

1483

error_t old_errno = errno;

1484

error_t ret_errno = 0;

1485

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

1486

ret_errno = errno;

1487

perror_plus("setuid");

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1909

1494

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);

1495

struct dirent **direntries;

1496

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

1497

alphasort);

1928

1498

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);

1499

if(errno == ENOENT){

1500

if(debug){

1501

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

1502

" found\n", hookdir);

1503

}

1504

} else {

1505

perror_plus("scandir");

1944

1506

}

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){

1507

} else {

1508

struct dirent *direntry;

1509

int ret;

1510

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

1511

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

1512

direntry = direntries[i];

1513

char *fullname = NULL;

1514

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

1515

if(ret < 0){

1991

1516

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1517

continue;

1518

}

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

pid_t hook_pid = fork();

1524

if(hook_pid == 0){

1525

/* Child */

1526

/* Raise privileges */

1527

raise_privileges_permanently();

1528

/* Set group */

1529

errno = 0;

1530

ret = setgid(0);

1531

if(ret == -1){

1532

perror_plus("setgid");

1533

}

1534

/* Reset supplementary groups */

1535

errno = 0;

1536

ret = setgroups(0, NULL);

1537

if(ret == -1){

1538

perror_plus("setgroups");

1539

}

1540

dup2(devnull, STDIN_FILENO);

1541

close(devnull);

1542

dup2(STDERR_FILENO, STDOUT_FILENO);

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

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

1559

if(ret == -1){

1560

perror_plus("setenv");

1561

_exit(EX_OSERR);

1562

}

1563

char *delaystring;

1564

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

1565

if(ret == -1){

1566

perror_plus("asprintf");

1567

_exit(EX_OSERR);

1568

}

1569

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

1570

if(ret == -1){

1571

free(delaystring);

1572

perror_plus("setenv");

1573

_exit(EX_OSERR);

1574

}

1996

1575

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;

1576

if(connect_to != NULL){

1577

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

1578

if(ret == -1){

1579

perror_plus("setenv");

1580

_exit(EX_OSERR);

1581

}

1582

}

1583

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

1584

perror_plus("execl");

1585

_exit(EXIT_FAILURE);

1586

}

2065

1587

} 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);

1588

int status;

1589

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

1590

perror_plus("waitpid");

1591

free(fullname);

1592

continue;

1593

}

1594

if(WIFEXITED(status)){

1595

if(WEXITSTATUS(status) != 0){

1596

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

1597

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

1598

WEXITSTATUS(status));

1599

free(fullname);

1600

continue;

1601

}

1602

} else if(WIFSIGNALED(status)){

1603

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

1604

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

1605

WTERMSIG(status));

1606

free(fullname);

1607

continue;

1608

} else {

1609

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

1610

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

1611

free(fullname);

1612

continue;

1613

}

1614

}

1615

free(fullname);

1616

if(debug){

1617

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

1618

direntry->d_name);

1619

}

1620

}

1621

close(devnull);

1622

}

1623

return true;

2085

1624

}

2086

1625

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;

1626

error_t bring_up_interface(const char *const interface,

1627

const float delay){

1628

int sd = -1;

1629

error_t old_errno = errno;

1630

error_t ret_errno = 0;

1631

int ret, ret_setflags;

2092

1632

struct ifreq network;

2093

1633

unsigned int if_index = if_nametoindex(interface);

2094

1634

if(if_index == 0){

2103

1643

}

2104

1644

2105

1645

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

1646

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

2109

1647

ret_errno = errno;

2110

1648

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

2111

1649

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

2112

errno = old_errno;

2113

1650

return ret_errno;

2114

1651

}

2115

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

1652

network.ifr_flags |= IFF_UP;

2116

1653

2117

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

2118

if(sd == -1){

1654

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1655

if(sd < 0){

2119

1656

ret_errno = errno;

2120

1657

perror_plus("socket");

2121

1658

errno = old_errno;

2122

1659

return ret_errno;

2123

1660

}

2124

1661

2125

1662

if(quit_now){

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

1663

close(sd);

2130

1664

errno = old_errno;

2131

1665

return EINTR;

2132

1666

}

2136

1670

interface);

2137

1671

}

2138

1672

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

}

1673

/* Raise priviliges */

1674

raise_privileges();

2145

1675

2146

1676

#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

}

1677

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1678

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

1679

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

1680

bool restore_loglevel = true;

1681

if(ret_linux == -1){

1682

restore_loglevel = false;

1683

perror_plus("klogctl");

2158

1684

}

2159

1685

#endif /* __linux__ */

2160

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

2161

ioctl_errno = errno;

1686

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

1687

ret_errno = errno;

2162

1688

#ifdef __linux__

2163

1689

if(restore_loglevel){

2164

1690

ret_linux = klogctl(7, NULL, 0);

2168

1694

}

2169

1695

#endif /* __linux__ */

2170

1696

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

}

1697

/* Lower privileges */

1698

lower_privileges();

2180

1699

2181

1700

/* Close the socket */

2182

ret = close(sd);

1701

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

2183

1702

if(ret == -1){

2184

1703

perror_plus("close");

2185

1704

}

2186

1705

2187

1706

if(ret_setflags == -1){

2188

errno = ioctl_errno;

1707

errno = ret_errno;

2189

1708

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2190

1709

errno = old_errno;

2191

return ioctl_errno;

1710

return ret_errno;

2192

1711

}

2193

1712

} else if(debug){

2194

1713

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

2197

1716

2198

1717

/* Sleep checking until interface is running.

2199

1718

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

2200

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

1719

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

2201

1720

if(interface_is_running(interface)){

2202

1721

break;

2203

1722

}

2212

1731

return 0;

2213

1732

}

2214

1733

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

1734

error_t take_down_interface(const char *const interface){

1735

error_t old_errno = errno;

2218

1736

struct ifreq network;

2219

1737

unsigned int if_index = if_nametoindex(interface);

2220

1738

if(if_index == 0){

2223

1741

return ENXIO;

2224

1742

}

2225

1743

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

1744

error_t ret_errno = 0;

2228

1745

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

2229

1746

ret_errno = errno;

2230

1747

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

2231

1748

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

2232

errno = old_errno;

2233

1749

return ret_errno;

2234

1750

}

2235

1751

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

2236

1752

2237

1753

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

2238

if(sd == -1){

1754

if(sd < 0){

2239

1755

ret_errno = errno;

2240

1756

perror_plus("socket");

2241

1757

errno = old_errno;

2247

1763

interface);

2248

1764

}

2249

1765

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

}

1766

/* Raise priviliges */

1767

raise_privileges();

2256

1768

2257

1769

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

2258

ioctl_errno = errno;

1770

ret_errno = errno;

2259

1771

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

}

1772

/* Lower privileges */

1773

lower_privileges();

2269

1774

2270

1775

/* Close the socket */

2271

int ret = close(sd);

1776

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

2272

1777

if(ret == -1){

2273

1778

perror_plus("close");

2274

1779

}

2275

1780

2276

1781

if(ret_setflags == -1){

2277

errno = ioctl_errno;

1782

errno = ret_errno;

2278

1783

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2279

1784

errno = old_errno;

2280

return ioctl_errno;

1785

return ret_errno;

2281

1786

}

2282

1787

} else if(debug){

2283

1788

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

2289

1794

}

2290

1795

2291

1796

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 };

1797

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

1798

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

1799

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

1800

.interfaces = NULL, .interfaces_size = 0 };

2297

1801

AvahiSServiceBrowser *sb = NULL;

2298

1802

error_t ret_errno;

2299

1803

int ret;

2302

1806

int exitcode = EXIT_SUCCESS;

2303

1807

char *interfaces_to_take_down = NULL;

2304

1808

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;

1809

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

1810

bool tempdir_created = false;

2308

1811

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2309

1812

const char *seckey = PATHDIR "/" SECKEY;

2310

1813

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

1814

char *interfaces_hooks = NULL;

2313

1815

2314

1816

bool gnutls_initialized = false;

2367

1869

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

2368

1870

" Diffie-Hellman key exchange",

2369

1871

.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

1872

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

2376

1873

.arg = "STRING",

2377

1874

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

2432

1929

}

2433

1930

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

2434

1931

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2438

1932

case 130: /* --priority */

2439

1933

mc.priority = arg;

2440

1934

break;

2480

1974

.args_doc = "",

2481

1975

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

2482

1976

" 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){

1977

ret = argp_parse(&argp, argc, argv,

1978

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1979

switch(ret){

2486

1980

case 0:

2487

1981

break;

2488

1982

case ENOMEM:

2489

1983

default:

2490

errno = ret_errno;

1984

errno = ret;

2491

1985

perror_plus("argp_parse");

2492

1986

exitcode = EX_OSERR;

2493

1987

goto end;

2496

1990

goto end;

2497

1991

}

2498

1992

}

2499

1993

2500

1994

{

2501

1995

/* Work around Debian bug #633582:

2502

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

1996

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

2503

1997

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

2509

} else {

1998

/* Re-raise priviliges */

1999

if(raise_privileges() == 0){

2510

2000

struct stat st;

2511

2001

2512

2002

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

2526

2016

}

2527

2017

}

2528

2018

}

2529

close(seckey_fd);

2019

TEMP_FAILURE_RETRY(close(seckey_fd));

2530

2020

}

2531

2021

}

2532

2022

2533

2023

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

2534

2024

int pubkey_fd = open(pubkey, O_RDONLY);

2535

2025

if(pubkey_fd == -1){

2547

2037

}

2548

2038

}

2549

2039

}

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

2040

TEMP_FAILURE_RETRY(close(pubkey_fd));

2041

}

2042

}

2043

2576

2044

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

2581

}

2045

lower_privileges();

2582

2046

}

2583

2047

}

2584

2048

2610

2074

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

2611

2075

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

2612

2076

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2615

2081

}

2616

2082

2617

2083

if(not debug){

2695

2161

2696

2162

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

2697

2163

if(mc.interfaces == NULL){

2698

struct dirent **direntries = NULL;

2164

struct dirent **direntries;

2699

2165

/* Look for any good interfaces */

2700

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2701

2167

alphasort);

2707

2173

if(ret_errno != 0){

2708

2174

errno = ret_errno;

2709

2175

perror_plus("argz_add");

2710

free(direntries[i]);

2711

2176

continue;

2712

2177

}

2713

2178

if(debug){

2714

2179

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

2715

2180

direntries[i]->d_name);

2716

2181

}

2717

free(direntries[i]);

2718

2182

}

2719

2183

free(direntries);

2720

2184

} else {

2721

if(ret == 0){

2722

free(direntries);

2723

}

2185

free(direntries);

2724

2186

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

2725

2187

exitcode = EXIT_FAILURE;

2726

2188

goto end;

2749

2211

break;

2750

2212

}

2751

2213

bool interface_was_up = interface_is_up(interface);

2752

errno = bring_up_interface(interface, delay);

2214

ret = bring_up_interface(interface, delay);

2753

2215

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));

2216

if(ret != 0){

2217

errno = ret;

2218

perror_plus("Failed to bring up interface");

2757

2219

} else {

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2220

ret_errno = argz_add(&interfaces_to_take_down,

2221

&interfaces_to_take_down_size,

2222

interface);

2223

if(ret_errno != 0){

2224

errno = ret_errno;

2762

2225

perror_plus("argz_add");

2763

2226

}

2764

2227

}

2782

2245

goto end;

2783

2246

}

2784

2247

2785

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

2248

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

2786

2249

if(ret == -1){

2787

2250

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

2788

2251

exitcode = EX_UNAVAILABLE;

2795

2258

goto end;

2796

2259

}

2797

2260

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){

2261

if(mkdtemp(tempdir) == NULL){

2808

2262

perror_plus("mkdtemp");

2809

2263

goto end;

2810

2264

}

2265

tempdir_created = true;

2811

2266

2812

2267

if(quit_now){

2813

2268

goto end;

2888

2343

sleep((unsigned int)retry_interval);

2889

2344

}

2890

2345

2891

if(not quit_now){

2346

if (not quit_now){

2892

2347

exitcode = EXIT_SUCCESS;

2893

2348

}

2894

2349

2910

2365

2911

2366

/* Allocate a new server */

2912

2367

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

2368

&config, NULL, NULL, &ret_errno);

2914

2369

2915

2370

/* Free the Avahi configuration data */

2916

2371

avahi_server_config_free(&config);

2919

2374

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

2920

2375

if(mc.server == NULL){

2921

2376

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

2922

avahi_strerror(ret));

2377

avahi_strerror(ret_errno));

2923

2378

exitcode = EX_UNAVAILABLE;

2924

2379

goto end;

2925

2380

}

2949

2404

if(debug){

2950

2405

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

2951

2406

}

2952

2407

2953

2408

ret = avahi_loop_with_timeout(simple_poll,

2954

2409

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

2955

2410

if(debug){

2960

2415

end:

2961

2416

2962

2417

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

}

2418

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

2970

2419

}

2971

2420

2972

2421

/* Cleanup things */

2983

2432

2984

2433

if(gnutls_initialized){

2985

2434

gnutls_certificate_free_credentials(mc.cred);

2435

gnutls_global_deinit();

2986

2436

gnutls_dh_params_deinit(mc.dh_params);

2987

2437

}

2988

2438

2996

2446

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

2997

2447

while(mc.current_server != NULL){

2998

2448

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

2449

free(mc.current_server);

3008

2450

mc.current_server = next;

3009

2451

}

3010

2452

}

3011

2453

3012

/* Re-raise privileges */

2454

/* Re-raise priviliges */

3013

2455

{

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

}

2456

raise_privileges();

2457

2458

/* Run network hooks */

2459

run_network_hooks("stop", interfaces_hooks != NULL ?

2460

interfaces_hooks : "", delay);

2461

2462

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

2463

{

2464

char *interface = NULL;

2465

while((interface=argz_next(interfaces_to_take_down,

2466

interfaces_to_take_down_size,

2467

interface))){

2468

ret_errno = take_down_interface(interface);

2469

if(ret_errno != 0){

2470

errno = ret_errno;

2471

perror_plus("Failed to take down interface");

2472

}

2473

}

2474

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

2475

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

2476

" down\n");

2477

}

2478

}

2479

2480

lower_privileges_permanently();

3048

2481

}

3049

2482

3050

2483

free(interfaces_to_take_down);

3051

2484

free(interfaces_hooks);

3052

2485

3053

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

3054

uintmax_t level){

2486

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

2487

if(tempdir_created){

3055

2488

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){

2489

struct dirent *direntry = NULL;

2490

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

2491

alphasort);

2492

if (numentries > 0){

3068

2493

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) and (errno != ENOENT)){

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);

2494

direntry = direntries[i];

2495

char *fullname = NULL;

2496

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

2497

direntry->d_name);

2498

if(ret < 0){

2499

perror_plus("asprintf");

2500

continue;

2501

}

2502

ret = remove(fullname);

2503

if(ret == -1){

2504

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

2505

strerror(errno));

2506

}

2507

free(fullname);

2508

}

2509

}

2510

2511

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

2512

free(direntries);

2513

if (numentries == -1){

2514

perror_plus("scandir");

2515

}

2516

ret = rmdir(tempdir);

2517

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

2518

perror_plus("rmdir");

2519

}

3112

2520

}

3113

2521

3114

2522

if(quit_now){