/mandos/trunk : revision 923

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

10

*

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* Everything else is

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13

14

*

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* 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

12

13

14

*

15

* This file is part of Mandos.

16

*

17

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

18

* under the terms of the GNU General Public License as published by

19

* the Free Software Foundation, either version 3 of the License, or

20

* (at your option) any later version.

21

*

22

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

21

23

* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

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

23

25

* General Public License for more details.

24

26

*

25

27

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

26

* along with this program. If not, see

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

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

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29

*

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30

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

30

31

*/

32

33

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

33

34

#ifndef _LARGEFILE_SOURCE

34

35

#define _LARGEFILE_SOURCE

35

#endif

36

#endif /* not _LARGEFILE_SOURCE */

36

37

#ifndef _FILE_OFFSET_BITS

37

38

#define _FILE_OFFSET_BITS 64

38

#endif

39

#endif /* not _FILE_OFFSET_BITS */

39

40

41

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

41

42

43

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

43

stdout, ferror(), remove() */

44

stdout, ferror() */

44

45

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

45

46

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

46

47

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

47

48

strtof(), abort() */

48

49

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

49

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

50

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

50

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

51

asprintf(), strncpy(), strsignal()

52

*/

51

53

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

52

54

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

53

55

sockaddr_in6, PF_INET6,

55

57

opendir(), DIR */

56

58

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

57

59

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

58

inet_pton(), connect() */

59

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

60

inet_pton(), connect(),

61

getnameinfo() */

62

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

60

63

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

61

64

*/

62

65

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

63

66

strtoimax() */

64

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

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

72

program_invocation_short_name */

66

73

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

67

74

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

72

79

*/

73

80

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

74

81

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

75

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

76

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

82

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

83

unlinkat() */

84

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

77

85

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

78

86

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

79

87

argp_state, struct argp,

91

99

argz_delete(), argz_append(),

92

100

argz_stringify(), argz_add(),

93

101

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

94

104

95

105

#ifdef __linux__

96

106

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

138

148

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

139

149

char *connect_to = NULL;

140

150

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

141

152

uid_t uid = 65534;

142

153

gid_t gid = 65534;

143

154

180

191

perror(print_text);

181

192

}

182

193

183

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

194

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

184

195

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

185

196

va_list ap;

186

197

va_start (ap, format);

195

206

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

196

207

* "buffer_length" is how much is already used.

197

208

*/

209

__attribute__((nonnull, warn_unused_result))

198

210

size_t incbuffer(char **buffer, size_t buffer_length,

199

211

size_t buffer_capacity){

200

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

202

if(buffer == NULL){

213

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

214

if(new_buf == NULL){

215

int old_errno = errno;

216

free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

203

219

return 0;

204

220

}

221

*buffer = new_buf;

205

222

buffer_capacity += BUFFER_SIZE;

206

223

}

207

224

return buffer_capacity;

208

225

}

209

226

210

227

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

228

__attribute__((nonnull, warn_unused_result))

211

229

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

212

230

int af, server **current_server){

213

231

int ret;

222

240

.af = af };

223

241

if(new_server->ip == NULL){

224

242

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);

225

258

return false;

226

259

}

227

260

/* Special case of first server */

229

262

new_server->next = new_server;

230

263

new_server->prev = new_server;

231

264

*current_server = new_server;

232

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

233

265

} else {

266

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

234

267

new_server->next = *current_server;

235

268

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

236

269

new_server->prev->next = new_server;

237

270

(*current_server)->prev = new_server;

238

271

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

272

return true;

245

273

}

246

274

247

275

/*

248

276

* Initialize GPGME.

249

277

*/

250

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

251

const char *tempdir, mandos_context *mc){

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){

252

283

gpgme_error_t rc;

253

284

gpgme_engine_info_t engine_info;

254

285

255

286

/*

256

287

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

257

288

*/

258

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

259

290

int ret;

260

291

int fd;

261

292

gpgme_data_t pgp_data;

280

311

return false;

281

312

}

282

313

283

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

314

ret = close(fd);

284

315

if(ret == -1){

285

316

perror_plus("close");

286

317

}

342

373

* Decrypt OpenPGP data.

343

374

* Returns -1 on error

344

375

*/

376

__attribute__((nonnull, warn_unused_result))

345

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

378

size_t crypto_size,

347

379

char **plaintext,

467

499

return plaintext_length;

468

500

}

469

501

470

static const char * safer_gnutls_strerror(int value){

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){

471

511

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

512

return safe_string(ret);

475

513

}

476

514

477

515

/* GnuTLS log function callback */

516

__attribute__((nonnull))

478

517

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

479

518

const char* string){

480

519

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

481

520

}

482

521

522

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

483

523

static int init_gnutls_global(const char *pubkeyfilename,

484

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

485

526

mandos_context *mc){

486

527

int ret;

528

unsigned int uret;

487

529

488

530

if(debug){

489

531

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

490

532

}

491

533

492

ret = gnutls_global_init();

493

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

496

return -1;

497

}

498

499

534

if(debug){

500

535

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

501

536

* - GnuTLS manual

509

544

if(ret != GNUTLS_E_SUCCESS){

510

545

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

511

546

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

513

547

return -1;

514

548

}

515

549

540

574

safer_gnutls_strerror(ret));

541

575

goto globalfail;

542

576

}

543

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

544

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

547

goto globalfail;

548

}

549

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

}

550

750

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

551

751

552

752

return 0;

554

754

globalfail:

555

755

556

756

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

558

757

gnutls_dh_params_deinit(mc->dh_params);

559

758

return -1;

560

759

}

561

760

761

__attribute__((nonnull, warn_unused_result))

562

762

static int init_gnutls_session(gnutls_session_t *session,

563

763

mandos_context *mc){

564

764

int ret;

611

811

/* ignore client certificate if any. */

612

812

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

813

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

616

814

return 0;

617

815

}

618

816

620

818

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

621

819

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

622

820

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

623

1039

/* Called when a Mandos server is found */

1040

__attribute__((nonnull, warn_unused_result))

624

1041

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

625

1042

AvahiIfIndex if_index,

626

1043

int af, mandos_context *mc){

627

1044

int ret, tcp_sd = -1;

628

1045

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1046

struct sockaddr_storage to;

633

1047

char *buffer = NULL;

634

1048

char *decrypted_buffer = NULL;

635

1049

size_t buffer_length = 0;

638

1052

int retval = -1;

639

1053

gnutls_session_t session;

640

1054

int pf; /* Protocol family */

1055

bool route_added = false;

641

1056

642

1057

errno = 0;

643

1058

665

1080

bool match = false;

666

1081

{

667

1082

char *interface = NULL;

668

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

669

interface))){

1083

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

1084

mc->interfaces_size,

1085

interface))){

670

1086

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

671

1087

match = true;

672

1088

break;

701

1117

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

702

1118

}

703

1119

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

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

705

1121

if(tcp_sd < 0){

706

1122

int e = errno;

707

1123

perror_plus("socket");

714

1130

goto mandos_end;

715

1131

}

716

1132

717

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

718

1133

if(af == AF_INET6){

719

to.in6.sin6_family = (sa_family_t)af;

720

ret = inet_pton(af, ip, &to.in6.sin6_addr);

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);

721

1137

} else { /* IPv4 */

722

to.in.sin_family = (sa_family_t)af;

723

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

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);

724

1141

}

725

1142

if(ret < 0 ){

726

1143

int e = errno;

735

1152

goto mandos_end;

736

1153

}

737

1154

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

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

741

-Wunreachable-code*/

1155

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

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

742

1158

if(if_index == AVAHI_IF_UNSPEC){

743

1159

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

744

1160

" incomplete without a network interface\n");

746

1162

goto mandos_end;

747

1163

}

748

1164

/* Set the network interface number as scope */

749

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

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

750

1166

}

751

1167

} else {

752

to.in.sin_port = htons(port); /* Spurious warnings from

753

-Wconversion and

754

-Wunreachable-code */

1168

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

755

1169

}

756

1170

757

1171

if(quit_now){

774

1188

}

775

1189

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

1190

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

777

const char *pcret;

778

if(af == AF_INET6){

779

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

780

sizeof(addrstr));

781

} else {

782

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

783

sizeof(addrstr));

784

}

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

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

789

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

790

}

791

}

792

}

793

794

if(quit_now){

795

errno = EINTR;

796

goto mandos_end;

797

}

798

799

if(af == AF_INET6){

800

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

801

} else {

802

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

803

}

804

if(ret < 0){

805

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

806

int e = errno;

807

perror_plus("connect");

808

errno = e;

809

}

810

goto mandos_end;

811

}

812

813

if(quit_now){

814

errno = EINTR;

815

goto mandos_end;

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;

816

1271

}

817

1272

818

1273

const char *out = mandos_protocol_version;

972

1427

&decrypted_buffer, mc);

973

1428

if(decrypted_buffer_size >= 0){

974

1429

1430

clearerr(stdout);

975

1431

written = 0;

976

1432

while(written < (size_t) decrypted_buffer_size){

977

1433

if(quit_now){

993

1449

}

994

1450

written += (size_t)ret;

995

1451

}

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

}

996

1462

retval = 0;

997

1463

}

998

1464

}

1001

1467

1002

1468

mandos_end:

1003

1469

{

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

}

1004

1476

int e = errno;

1005

1477

free(decrypted_buffer);

1006

1478

free(buffer);

1007

1479

if(tcp_sd >= 0){

1008

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

1480

ret = close(tcp_sd);

1009

1481

}

1010

1482

if(ret == -1){

1011

1483

if(e == 0){

1036

1508

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

1509

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

1510

flags,

1039

void* mc){

1511

void *mc){

1040

1512

if(r == NULL){

1041

1513

return;

1042

1514

}

1045

1517

timed out */

1046

1518

1047

1519

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1048

1521

return;

1049

1522

}

1050

1523

1095

1568

const char *domain,

1096

1569

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1570

flags,

1098

void* mc){

1571

void *mc){

1099

1572

if(b == NULL){

1100

1573

return;

1101

1574

}

1161

1634

errno = old_errno;

1162

1635

}

1163

1636

1637

__attribute__((nonnull, warn_unused_result))

1164

1638

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

1165

1639

int ret;

1166

error_t ret_errno;

1640

int old_errno;

1167

1641

1168

1642

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

1169

1643

if(s < 0){

1170

ret_errno = errno;

1644

old_errno = errno;

1171

1645

perror_plus("socket");

1172

errno = ret_errno;

1646

errno = old_errno;

1173

1647

return false;

1174

1648

}

1175

strcpy(ifr->ifr_name, ifname);

1649

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

1650

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

1176

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1652

if(ret == -1){

1178

1653

if(debug){

1179

ret_errno = errno;

1654

old_errno = errno;

1180

1655

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1656

errno = old_errno;

1182

1657

}

1183

1658

return false;

1184

1659

}

1185

1660

return true;

1186

1661

}

1187

1662

1663

__attribute__((nonnull, warn_unused_result))

1188

1664

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

1189

1665

1190

1666

/* Reject the loopback device */

1232

1708

* corresponds to an acceptable network device.

1233

1709

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

1234

1710

*/

1711

__attribute__((nonnull, warn_unused_result))

1235

1712

int good_interface(const struct dirent *if_entry){

1236

1713

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

1237

1714

return 0;

1255

1732

/*

1256

1733

* This function determines if a network interface is up.

1257

1734

*/

1735

__attribute__((nonnull, warn_unused_result))

1258

1736

bool interface_is_up(const char *interface){

1259

1737

struct ifreq ifr;

1260

1738

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

1271

1749

/*

1272

1750

* This function determines if a network interface is running

1273

1751

*/

1752

__attribute__((nonnull, warn_unused_result))

1274

1753

bool interface_is_running(const char *interface){

1275

1754

struct ifreq ifr;

1276

1755

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

1284

1763

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

1285

1764

}

1286

1765

1766

__attribute__((nonnull, pure, warn_unused_result))

1287

1767

int notdotentries(const struct dirent *direntry){

1288

1768

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

1289

1769

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

1296

1776

}

1297

1777

1298

1778

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

1779

__attribute__((nonnull, warn_unused_result))

1299

1780

int runnable_hook(const struct dirent *direntry){

1300

1781

int ret;

1301

1782

size_t sret;

1309

1790

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

1310

1791

"abcdefghijklmnopqrstuvwxyz"

1311

1792

"0123456789"

1312

"_-");

1793

"_.-");

1313

1794

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

1314

1795

/* Contains non-allowed characters */

1315

1796

if(debug){

1319

1800

return 0;

1320

1801

}

1321

1802

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1803

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

1330

1804

if(ret == -1){

1331

1805

if(debug){

1332

1806

perror_plus("Could not stat hook");

1356

1830

return 1;

1357

1831

}

1358

1832

1833

__attribute__((nonnull, warn_unused_result))

1359

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

1835

mandos_context *mc){

1361

1836

int ret;

1365

1840

1366

1841

while(true){

1367

1842

if(mc->current_server == NULL){

1368

if (debug){

1843

if(debug){

1369

1844

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

1370

1845

" No timeout!\n");

1371

1846

}

1372

1847

ret = avahi_simple_poll_iterate(s, -1);

1373

1848

} else {

1374

if (debug){

1849

if(debug){

1375

1850

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

1376

1851

" it, or wait\n");

1377

1852

}

1394

1869

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

1395

1870

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

1396

1871

1397

if (debug){

1872

if(debug){

1398

1873

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

1399

1874

block_time);

1400

1875

}

1422

1897

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

1423

1898

}

1424

1899

if(ret != 0){

1425

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

1900

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

1426

1901

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

1427

1902

}

1428

1903

}

1429

1904

}

1430

1905

}

1431

1906

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1907

__attribute__((nonnull))

1908

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

1485

1909

const float delay){

1486

struct dirent **direntries;

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);

1928

if(numhooks == -1){

1929

perror_plus("scandir");

1930

return;

1931

}

1487

1932

struct dirent *direntry;

1488

1933

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

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

1944

}

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

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

1991

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1566

1996

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

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;

1578

2065

} else {

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

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);

1615

2085

}

1616

2086

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

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;

1623

2092

struct ifreq network;

1624

2093

unsigned int if_index = if_nametoindex(interface);

1625

2094

if(if_index == 0){

1634

2103

}

1635

2104

1636

2105

if(not interface_is_up(interface)){

1637

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

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

1638

2109

ret_errno = errno;

1639

2110

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

1640

2111

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

2112

errno = old_errno;

1641

2113

return ret_errno;

1642

2114

}

1643

network.ifr_flags |= IFF_UP;

2115

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

1644

2116

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

2117

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

2118

if(sd == -1){

1647

2119

ret_errno = errno;

1648

2120

perror_plus("socket");

1649

2121

errno = old_errno;

1650

2122

return ret_errno;

1651

2123

}

1652

2124

1653

2125

if(quit_now){

1654

close(sd);

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

1655

2130

errno = old_errno;

1656

2131

return EINTR;

1657

2132

}

1661

2136

interface);

1662

2137

}

1663

2138

1664

/* Raise priviliges */

1665

raise_privileges();

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

}

1666

2145

1667

2146

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

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

2158

}

1676

2159

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

2160

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

2161

ioctl_errno = errno;

1679

2162

#ifdef __linux__

1680

2163

if(restore_loglevel){

1681

2164

ret_linux = klogctl(7, NULL, 0);

1685

2168

}

1686

2169

#endif /* __linux__ */

1687

2170

1688

/* Lower privileges */

1689

lower_privileges();

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

}

1690

2180

1691

2181

/* Close the socket */

1692

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

2182

ret = close(sd);

1693

2183

if(ret == -1){

1694

2184

perror_plus("close");

1695

2185

}

1696

2186

1697

2187

if(ret_setflags == -1){

1698

errno = ret_errno;

2188

errno = ioctl_errno;

1699

2189

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

2190

errno = old_errno;

1701

return ret_errno;

2191

return ioctl_errno;

1702

2192

}

1703

2193

} else if(debug){

1704

2194

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

1707

2197

1708

2198

/* Sleep checking until interface is running.

1709

2199

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

1710

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

2200

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

1711

2201

if(interface_is_running(interface)){

1712

2202

break;

1713

2203

}

1722

2212

return 0;

1723

2213

}

1724

2214

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

1730

2218

struct ifreq network;

1731

2219

unsigned int if_index = if_nametoindex(interface);

1732

2220

if(if_index == 0){

1735

2223

return ENXIO;

1736

2224

}

1737

2225

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

1738

2228

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

1739

2229

ret_errno = errno;

1740

2230

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

1741

2231

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

2232

errno = old_errno;

1742

2233

return ret_errno;

1743

2234

}

1744

2235

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

1745

2236

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

2237

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

2238

if(sd == -1){

1748

2239

ret_errno = errno;

1749

2240

perror_plus("socket");

1750

2241

errno = old_errno;

1756

2247

interface);

1757

2248

}

1758

2249

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

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

}

2256

2257

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

2258

ioctl_errno = errno;

2259

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

}

1767

2269

1768

2270

/* Close the socket */

1769

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

2271

int ret = close(sd);

1770

2272

if(ret == -1){

1771

2273

perror_plus("close");

1772

2274

}

1773

2275

1774

2276

if(ret_setflags == -1){

1775

errno = ret_errno;

2277

errno = ioctl_errno;

1776

2278

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

2279

errno = old_errno;

1778

return ret_errno;

2280

return ioctl_errno;

1779

2281

}

1780

2282

} else if(debug){

1781

2283

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

1787

2289

}

1788

2290

1789

2291

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

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 };

1794

2297

AvahiSServiceBrowser *sb = NULL;

1795

2298

error_t ret_errno;

1796

2299

int ret;

1799

2302

int exitcode = EXIT_SUCCESS;

1800

2303

char *interfaces_to_take_down = NULL;

1801

2304

size_t interfaces_to_take_down_size = 0;

1802

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

1803

bool tempdir_created = false;

2305

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

2306

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

2307

char *tempdir = NULL;

1804

2308

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

2309

const char *seckey = PATHDIR "/" SECKEY;

1806

2310

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

1807

2312

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

2313

1810

2314

bool gnutls_initialized = false;

1811

2315

bool gpgme_initialized = false;

1863

2367

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

1864

2368

" Diffie-Hellman key exchange",

1865

2369

.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 },

1866

2375

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

1867

2376

.arg = "STRING",

1868

2377

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

1923

2432

}

1924

2433

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

1925

2434

break;

2435

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

2436

dh_params_file = arg;

2437

break;

1926

2438

case 130: /* --priority */

1927

2439

mc.priority = arg;

1928

2440

break;

1968

2480

.args_doc = "",

1969

2481

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

1970

2482

" passwords from a Mandos server" };

1971

ret = argp_parse(&argp, argc, argv,

1972

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1973

switch(ret){

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

1974

2486

case 0:

1975

2487

break;

1976

2488

case ENOMEM:

1977

2489

default:

1978

errno = ret;

2490

errno = ret_errno;

1979

2491

perror_plus("argp_parse");

1980

2492

exitcode = EX_OSERR;

1981

2493

goto end;

1984

2496

goto end;

1985

2497

}

1986

2498

}

1987

2499

1988

2500

{

1989

2501

/* Work around Debian bug #633582:

1990

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

2502

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

1991

2503

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

2509

} else {

1994

2510

struct stat st;

1995

2511

1996

2512

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

2010

2526

}

2011

2527

}

2012

2528

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2529

close(seckey_fd);

2014

2530

}

2015

2531

}

2016

2532

2017

2533

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

2018

2534

int pubkey_fd = open(pubkey, O_RDONLY);

2019

2535

if(pubkey_fd == -1){

2031

2547

}

2032

2548

}

2033

2549

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

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

2576

/* Lower privileges */

2039

lower_privileges();

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

2581

}

2040

2582

}

2041

2583

}

2042

2584

2066

2608

goto end;

2067

2609

}

2068

2610

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2611

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

2612

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

2077

2615

}

2078

2616

2079

2617

if(not debug){

2157

2695

2158

2696

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

2159

2697

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2698

struct dirent **direntries = NULL;

2161

2699

/* Look for any good interfaces */

2162

2700

ret = scandir(sys_class_net, &direntries, good_interface,

2163

2701

alphasort);

2167

2705

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2168

2706

direntries[i]->d_name);

2169

2707

if(ret_errno != 0){

2708

errno = ret_errno;

2170

2709

perror_plus("argz_add");

2710

free(direntries[i]);

2171

2711

continue;

2172

2712

}

2173

2713

if(debug){

2174

2714

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

2175

2715

direntries[i]->d_name);

2176

2716

}

2717

free(direntries[i]);

2177

2718

}

2178

2719

free(direntries);

2179

2720

} else {

2180

free(direntries);

2721

if(ret == 0){

2722

free(direntries);

2723

}

2181

2724

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

2182

2725

exitcode = EXIT_FAILURE;

2183

2726

goto end;

2206

2749

break;

2207

2750

}

2208

2751

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2752

errno = bring_up_interface(interface, delay);

2210

2753

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2754

if(errno != 0){

2755

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

2756

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

2214

2757

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2762

perror_plus("argz_add");

2763

}

2218

2764

}

2219

2765

}

2220

2766

}

2236

2782

goto end;

2237

2783

}

2238

2784

2239

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

2785

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

2240

2786

if(ret == -1){

2241

2787

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

2242

2788

exitcode = EX_UNAVAILABLE;

2249

2795

goto end;

2250

2796

}

2251

2797

2252

if(mkdtemp(tempdir) == NULL){

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){

2253

2808

perror_plus("mkdtemp");

2254

2809

goto end;

2255

2810

}

2256

tempdir_created = true;

2257

2811

2258

2812

if(quit_now){

2259

2813

goto end;

2334

2888

sleep((unsigned int)retry_interval);

2335

2889

}

2336

2890

2337

if (not quit_now){

2891

if(not quit_now){

2338

2892

exitcode = EXIT_SUCCESS;

2339

2893

}

2340

2894

2356

2910

2357

2911

/* Allocate a new server */

2358

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2913

&config, NULL, NULL, &ret);

2360

2914

2361

2915

/* Free the Avahi configuration data */

2362

2916

avahi_server_config_free(&config);

2365

2919

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

2366

2920

if(mc.server == NULL){

2367

2921

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

2368

avahi_strerror(ret_errno));

2922

avahi_strerror(ret));

2369

2923

exitcode = EX_UNAVAILABLE;

2370

2924

goto end;

2371

2925

}

2395

2949

if(debug){

2396

2950

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

2397

2951

}

2398

2952

2399

2953

ret = avahi_loop_with_timeout(simple_poll,

2400

2954

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

2401

2955

if(debug){

2406

2960

end:

2407

2961

2408

2962

if(debug){

2409

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

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

}

2410

2970

}

2411

2971

2412

2972

/* Cleanup things */

2423

2983

2424

2984

if(gnutls_initialized){

2425

2985

gnutls_certificate_free_credentials(mc.cred);

2426

gnutls_global_deinit();

2427

2986

gnutls_dh_params_deinit(mc.dh_params);

2428

2987

}

2429

2988

2437

2996

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

2438

2997

while(mc.current_server != NULL){

2439

2998

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

2440

3007

free(mc.current_server);

2441

3008

mc.current_server = next;

2442

3009

}

2443

3010

}

2444

3011

2445

/* Re-raise priviliges */

3012

/* Re-raise privileges */

2446

3013

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

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

2466

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

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

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

}

2472

3048

}

2473

3049

2474

3050

free(interfaces_to_take_down);

2475

3051

free(interfaces_hooks);

2476

3052

3053

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

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

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

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

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

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

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

3071

dirname, direntries[i]->d_name);

3072

}

3073

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

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

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

3077

AT_REMOVEDIR);

3078

}

3079

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

3080

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

3081

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

3082

/* Recurse only in this special case */

3083

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

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

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

3088

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

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

3107

}

3108

2477

3109

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

2478

if(tempdir_created){

2479

struct dirent **direntries = NULL;

2480

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

2484

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

2485

direntry = direntries[i];

2486

char *fullname = NULL;

2487

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

2488

direntry->d_name);

2489

if(ret < 0){

2490

perror_plus("asprintf");

2491

continue;

2492

}

2493

ret = remove(fullname);

2494

if(ret == -1){

2495

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

2496

strerror(errno));

2497

}

2498

free(fullname);

2499

}

2500

}

2501

2502

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

2503

free(direntries);

2504

if (numentries == -1){

2505

perror_plus("scandir");

2506

}

2507

ret = rmdir(tempdir);

2508

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

2509

perror_plus("rmdir");

2510

}

3110

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

2511

3112

}

2512

3113

2513

3114

if(quit_now){