/mandos/release : revision 237.7.493

9

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

10

*

11

* Everything else is

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*

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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

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13

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*

15

* This file is part of Mandos.

16

*

17

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

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

19

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

20

* (at your option) any later version.

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*

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* 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

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25

* General Public License for more details.

24

26

*

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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);

187

198

188

199

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

189

200

program_invocation_short_name));

190

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

201

return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

191

202

}

192

203

193

204

/*

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,

388

420

if(result == NULL){

389

421

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

390

422

} else {

391

fprintf_plus(stderr, "Unsupported algorithm: %s\n",

392

result->unsupported_algorithm);

393

fprintf_plus(stderr, "Wrong key usage: %u\n",

394

result->wrong_key_usage);

423

if(result->unsupported_algorithm != NULL) {

424

fprintf_plus(stderr, "Unsupported algorithm: %s\n",

425

result->unsupported_algorithm);

426

}

427

fprintf_plus(stderr, "Wrong key usage: %s\n",

428

result->wrong_key_usage ? "Yes" : "No");

395

429

if(result->file_name != NULL){

396

430

fprintf_plus(stderr, "File name: %s\n", result->file_name);

397

431

}

467

501

return plaintext_length;

468

502

}

469

503

470

static const char * safer_gnutls_strerror(int value){

504

__attribute__((warn_unused_result, const))

505

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

506

if(str == NULL)

507

return "(unknown)";

508

return str;

509

}

510

511

__attribute__((warn_unused_result))

512

static const char *safer_gnutls_strerror(int value){

471

513

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

514

return safe_string(ret);

475

515

}

476

516

477

517

/* GnuTLS log function callback */

518

__attribute__((nonnull))

478

519

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

479

520

const char* string){

480

521

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

481

522

}

482

523

524

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

483

525

static int init_gnutls_global(const char *pubkeyfilename,

484

526

const char *seckeyfilename,

527

const char *dhparamsfilename,

485

528

mandos_context *mc){

486

529

int ret;

530

unsigned int uret;

487

531

488

532

if(debug){

489

533

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

490

534

}

491

535

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

536

if(debug){

500

537

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

501

538

* - GnuTLS manual

509

546

if(ret != GNUTLS_E_SUCCESS){

510

547

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

511

548

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

513

549

return -1;

514

550

}

515

551

540

576

safer_gnutls_strerror(ret));

541

577

goto globalfail;

542

578

}

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

579

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

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

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

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

ret = close(dhpfile);

619

if(ret == -1){

620

perror_plus("close");

621

}

622

if(params.data == NULL){

623

dhparamsfilename = NULL;

624

}

625

if(dhparamsfilename == NULL){

626

break;

627

}

628

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

629

GNUTLS_X509_FMT_PEM);

630

if(ret != GNUTLS_E_SUCCESS){

631

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

632

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

633

safer_gnutls_strerror(ret));

634

dhparamsfilename = NULL;

635

}

636

free(params.data);

637

} while(false);

638

}

639

if(dhparamsfilename == NULL){

640

if(mc->dh_bits == 0){

641

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

642

/* Try to read the private key file */

643

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

644

do {

645

int secfile = open(seckeyfilename, O_RDONLY);

646

if(secfile == -1){

647

perror_plus("open");

648

break;

649

}

650

size_t buffer_capacity = 0;

651

while(true){

652

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

653

(size_t)buffer.size,

654

(size_t)buffer_capacity);

655

if(buffer_capacity == 0){

656

perror_plus("incbuffer");

657

free(buffer.data);

658

buffer.data = NULL;

659

break;

660

}

661

ssize_t bytes_read = read(secfile,

662

buffer.data + buffer.size,

663

BUFFER_SIZE);

664

/* EOF */

665

if(bytes_read == 0){

666

break;

667

}

668

/* check bytes_read for failure */

669

if(bytes_read < 0){

670

perror_plus("read");

671

free(buffer.data);

672

buffer.data = NULL;

673

break;

674

}

675

buffer.size += (unsigned int)bytes_read;

676

}

677

close(secfile);

678

} while(false);

679

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

680

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

681

if(buffer.data != NULL){

682

{

683

gnutls_openpgp_privkey_t privkey = NULL;

684

ret = gnutls_openpgp_privkey_init(&privkey);

685

if(ret != GNUTLS_E_SUCCESS){

686

fprintf_plus(stderr, "Error initializing OpenPGP key"

687

" structure: %s",

688

safer_gnutls_strerror(ret));

689

free(buffer.data);

690

buffer.data = NULL;

691

} else {

692

ret = gnutls_openpgp_privkey_import

693

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

694

if(ret != GNUTLS_E_SUCCESS){

695

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

696

safer_gnutls_strerror(ret));

697

privkey = NULL;

698

}

699

free(buffer.data);

700

buffer.data = NULL;

701

if(privkey != NULL){

702

/* Use private key to suggest an appropriate

703

sec_param */

704

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

705

gnutls_openpgp_privkey_deinit(privkey);

706

if(debug){

707

fprintf_plus(stderr, "This OpenPGP key implies using"

708

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

709

safe_string(gnutls_sec_param_get_name

710

(sec_param)));

711

}

712

}

713

}

714

}

715

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

716

/* Err on the side of caution */

717

sec_param = GNUTLS_SEC_PARAM_ULTRA;

718

if(debug){

719

fprintf_plus(stderr, "Falling back to security parameter"

720

" \"%s\"\n",

721

safe_string(gnutls_sec_param_get_name

722

(sec_param)));

723

}

724

}

725

}

726

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

727

if(uret != 0){

728

mc->dh_bits = uret;

729

if(debug){

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

mc->dh_bits);

735

}

736

} else {

737

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

738

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

739

safe_string(gnutls_sec_param_get_name

740

(sec_param)),

741

safer_gnutls_strerror(ret));

742

goto globalfail;

743

}

744

} else if(debug){

745

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

746

mc->dh_bits);

747

}

748

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

749

if(ret != GNUTLS_E_SUCCESS){

750

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

751

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

752

safer_gnutls_strerror(ret));

753

goto globalfail;

754

}

755

}

550

756

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

551

757

552

758

return 0;

554

760

globalfail:

555

761

556

762

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

558

763

gnutls_dh_params_deinit(mc->dh_params);

559

764

return -1;

560

765

}

561

766

767

__attribute__((nonnull, warn_unused_result))

562

768

static int init_gnutls_session(gnutls_session_t *session,

563

769

mandos_context *mc){

564

770

int ret;

611

817

/* ignore client certificate if any. */

612

818

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

819

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

616

820

return 0;

617

821

}

618

822

620

824

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

621

825

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

622

826

827

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

828

__attribute__((warn_unused_result))

829

int raise_privileges(void){

830

int old_errno = errno;

831

int ret = 0;

832

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

833

ret = errno;

834

}

835

errno = old_errno;

836

return ret;

837

}

838

839

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

840

__attribute__((warn_unused_result))

841

int raise_privileges_permanently(void){

842

int old_errno = errno;

843

int ret = raise_privileges();

844

if(ret != 0){

845

errno = old_errno;

846

return ret;

847

}

848

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

849

ret = errno;

850

}

851

errno = old_errno;

852

return ret;

853

}

854

855

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

856

__attribute__((warn_unused_result))

857

int lower_privileges(void){

858

int old_errno = errno;

859

int ret = 0;

860

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

861

ret = errno;

862

}

863

errno = old_errno;

864

return ret;

865

}

866

867

/* Lower privileges permanently */

868

__attribute__((warn_unused_result))

869

int lower_privileges_permanently(void){

870

int old_errno = errno;

871

int ret = 0;

872

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

873

ret = errno;

874

}

875

errno = old_errno;

876

return ret;

877

}

878

879

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

880

__attribute__((nonnull, warn_unused_result))

881

static bool add_delete_local_route(const bool add,

882

const char *address,

883

AvahiIfIndex if_index){

884

int ret;

885

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

886

char add_arg[] = "add";

887

char delete_arg[] = "delete";

888

char debug_flag[] = "--debug";

889

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

890

if(pluginhelperdir == NULL){

891

if(debug){

892

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

893

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

894

}

895

return false;

896

}

897

898

char interface[IF_NAMESIZE];

899

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

900

perror_plus("if_indextoname");

901

return false;

902

}

903

904

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

905

if(devnull == -1){

906

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

907

return false;

908

}

909

pid_t pid = fork();

910

if(pid == 0){

911

/* Child */

912

/* Raise privileges */

913

errno = raise_privileges_permanently();

914

if(errno != 0){

915

perror_plus("Failed to raise privileges");

916

/* _exit(EX_NOPERM); */

917

} else {

918

/* Set group */

919

errno = 0;

920

ret = setgid(0);

921

if(ret == -1){

922

perror_plus("setgid");

923

_exit(EX_NOPERM);

924

}

925

/* Reset supplementary groups */

926

errno = 0;

927

ret = setgroups(0, NULL);

928

if(ret == -1){

929

perror_plus("setgroups");

930

_exit(EX_NOPERM);

931

}

932

}

933

ret = dup2(devnull, STDIN_FILENO);

934

if(ret == -1){

935

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

936

_exit(EX_OSERR);

937

}

938

ret = close(devnull);

939

if(ret == -1){

940

perror_plus("close");

941

_exit(EX_OSERR);

942

}

943

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

944

if(ret == -1){

945

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

946

_exit(EX_OSERR);

947

}

948

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

949

O_RDONLY

950

| O_DIRECTORY

951

| O_PATH

952

| O_CLOEXEC));

953

if(helperdir_fd == -1){

954

perror_plus("open");

955

_exit(EX_UNAVAILABLE);

956

}

957

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

958

helper, O_RDONLY));

959

if(helper_fd == -1){

960

perror_plus("openat");

961

close(helperdir_fd);

962

_exit(EX_UNAVAILABLE);

963

}

964

close(helperdir_fd);

965

#ifdef __GNUC__

966

#pragma GCC diagnostic push

967

#pragma GCC diagnostic ignored "-Wcast-qual"

968

#endif

969

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

970

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

971

interface, debug ? debug_flag : NULL, NULL },

972

environ) == -1){

973

#ifdef __GNUC__

974

#pragma GCC diagnostic pop

975

#endif

976

perror_plus("fexecve");

977

_exit(EXIT_FAILURE);

978

}

979

}

980

if(pid == -1){

981

perror_plus("fork");

982

return false;

983

}

984

int status;

985

pid_t pret = -1;

986

errno = 0;

987

do {

988

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

989

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

990

int errno_raising = 0;

991

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

992

errno_raising = errno;

993

perror_plus("Failed to raise privileges in order to"

994

" kill helper program");

995

}

996

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

997

perror_plus("kill");

998

}

999

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

1000

perror_plus("Failed to lower privileges after killing"

1001

" helper program");

1002

}

1003

return false;

1004

}

1005

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

1006

if(pret == -1){

1007

perror_plus("waitpid");

1008

return false;

1009

}

1010

if(WIFEXITED(status)){

1011

if(WEXITSTATUS(status) != 0){

1012

fprintf_plus(stderr, "Error: iprouteadddel exited"

1013

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

1014

return false;

1015

}

1016

return true;

1017

}

1018

if(WIFSIGNALED(status)){

1019

fprintf_plus(stderr, "Error: iprouteadddel died by"

1020

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

1021

return false;

1022

}

1023

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

1024

return false;

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool add_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(true, address, if_index);

1034

}

1035

1036

__attribute__((nonnull, warn_unused_result))

1037

static bool delete_local_route(const char *address,

1038

AvahiIfIndex if_index){

1039

if(debug){

1040

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

1041

}

1042

return add_delete_local_route(false, address, if_index);

1043

}

1044

623

1045

/* Called when a Mandos server is found */

1046

__attribute__((nonnull, warn_unused_result))

624

1047

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

625

1048

AvahiIfIndex if_index,

626

1049

int af, mandos_context *mc){

627

1050

int ret, tcp_sd = -1;

628

1051

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1052

struct sockaddr_storage to;

633

1053

char *buffer = NULL;

634

1054

char *decrypted_buffer = NULL;

635

1055

size_t buffer_length = 0;

638

1058

int retval = -1;

639

1059

gnutls_session_t session;

640

1060

int pf; /* Protocol family */

1061

bool route_added = false;

641

1062

642

1063

errno = 0;

643

1064

665

1086

bool match = false;

666

1087

{

667

1088

char *interface = NULL;

668

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

669

interface))){

1089

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

1090

mc->interfaces_size,

1091

interface))){

670

1092

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

671

1093

match = true;

672

1094

break;

701

1123

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

702

1124

}

703

1125

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1126

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

705

1127

if(tcp_sd < 0){

706

1128

int e = errno;

707

1129

perror_plus("socket");

714

1136

goto mandos_end;

715

1137

}

716

1138

717

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

718

1139

if(af == AF_INET6){

719

to.in6.sin6_family = (sa_family_t)af;

720

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

1140

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

1141

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

1142

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

721

1143

} else { /* IPv4 */

722

to.in.sin_family = (sa_family_t)af;

723

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

1144

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

1145

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

1146

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

724

1147

}

725

1148

if(ret < 0 ){

726

1149

int e = errno;

735

1158

goto mandos_end;

736

1159

}

737

1160

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*/

1161

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

1162

if(IN6_IS_ADDR_LINKLOCAL

1163

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

742

1164

if(if_index == AVAHI_IF_UNSPEC){

743

1165

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

744

1166

" incomplete without a network interface\n");

746

1168

goto mandos_end;

747

1169

}

748

1170

/* Set the network interface number as scope */

749

to.in6.sin6_scope_id = (uint32_t)if_index;

1171

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

750

1172

}

751

1173

} else {

752

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

753

-Wconversion and

754

-Wunreachable-code */

1174

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

755

1175

}

756

1176

757

1177

if(quit_now){

774

1194

}

775

1195

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

1196

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;

1197

if(af == AF_INET6){

1198

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

1199

sizeof(struct sockaddr_in6),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

} else {

1203

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

1204

sizeof(struct sockaddr_in),

1205

addrstr, sizeof(addrstr), NULL, 0,

1206

NI_NUMERICHOST);

1207

}

1208

if(ret == EAI_SYSTEM){

1209

perror_plus("getnameinfo");

1210

} else if(ret != 0) {

1211

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

1212

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

1213

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

1214

}

1215

}

1216

1217

if(quit_now){

1218

errno = EINTR;

1219

goto mandos_end;

1220

}

1221

1222

while(true){

1223

if(af == AF_INET6){

1224

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

1225

sizeof(struct sockaddr_in6));

1226

} else {

1227

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

1228

sizeof(struct sockaddr_in));

1229

}

1230

if(ret < 0){

1231

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

1232

and if_index != AVAHI_IF_UNSPEC

1233

and connect_to == NULL

1234

and not route_added and

1235

((af == AF_INET6 and not

1236

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1237

&to)->sin6_addr)))

1238

or (af == AF_INET and

1239

/* Not a a IPv4LL address */

1240

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

1241

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

1242

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

1243

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

1244

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

1245

connect to a Mandos server announced by Avahi on a server

1246

host with a global address. Work around this by retrying

1247

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

1248

1249

Avahi bug reference:

1250

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

1251

https://bugs.debian.org/587961

1252

*/

1253

if(debug){

1254

fprintf_plus(stderr, "Mandos server unreachable, trying"

1255

" direct route\n");

1256

}

1257

int e = errno;

1258

route_added = add_local_route(ip, if_index);

1259

if(route_added){

1260

continue;

1261

}

1262

errno = e;

1263

}

1264

if(errno != ECONNREFUSED or debug){

1265

int e = errno;

1266

perror_plus("connect");

1267

errno = e;

1268

}

1269

goto mandos_end;

1270

}

1271

1272

if(quit_now){

1273

errno = EINTR;

1274

goto mandos_end;

1275

}

1276

break;

816

1277

}

817

1278

818

1279

const char *out = mandos_protocol_version;

972

1433

&decrypted_buffer, mc);

973

1434

if(decrypted_buffer_size >= 0){

974

1435

1436

clearerr(stdout);

975

1437

written = 0;

976

1438

while(written < (size_t) decrypted_buffer_size){

977

1439

if(quit_now){

993

1455

}

994

1456

written += (size_t)ret;

995

1457

}

1458

ret = fflush(stdout);

1459

if(ret != 0){

1460

int e = errno;

1461

if(debug){

1462

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

1463

strerror(errno));

1464

}

1465

errno = e;

1466

goto mandos_end;

1467

}

996

1468

retval = 0;

997

1469

}

998

1470

}

1001

1473

1002

1474

mandos_end:

1003

1475

{

1476

if(route_added){

1477

if(not delete_local_route(ip, if_index)){

1478

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

1479

" interface %d", ip, if_index);

1480

}

1481

}

1004

1482

int e = errno;

1005

1483

free(decrypted_buffer);

1006

1484

free(buffer);

1007

1485

if(tcp_sd >= 0){

1008

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

1486

ret = close(tcp_sd);

1009

1487

}

1010

1488

if(ret == -1){

1011

1489

if(e == 0){

1036

1514

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

1515

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

1516

flags,

1039

void* mc){

1517

void *mc){

1040

1518

if(r == NULL){

1041

1519

return;

1042

1520

}

1045

1523

timed out */

1046

1524

1047

1525

if(quit_now){

1526

avahi_s_service_resolver_free(r);

1048

1527

return;

1049

1528

}

1050

1529

1095

1574

const char *domain,

1096

1575

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1576

flags,

1098

void* mc){

1577

void *mc){

1099

1578

if(b == NULL){

1100

1579

return;

1101

1580

}

1161

1640

errno = old_errno;

1162

1641

}

1163

1642

1643

__attribute__((nonnull, warn_unused_result))

1164

1644

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

1165

1645

int ret;

1166

error_t ret_errno;

1646

int old_errno;

1167

1647

1168

1648

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

1169

1649

if(s < 0){

1170

ret_errno = errno;

1650

old_errno = errno;

1171

1651

perror_plus("socket");

1172

errno = ret_errno;

1652

errno = old_errno;

1173

1653

return false;

1174

1654

}

1175

strcpy(ifr->ifr_name, ifname);

1655

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

1656

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

1176

1657

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1658

if(ret == -1){

1178

1659

if(debug){

1179

ret_errno = errno;

1660

old_errno = errno;

1180

1661

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1662

errno = old_errno;

1663

}

1664

if((close(s) == -1) and debug){

1665

old_errno = errno;

1666

perror_plus("close");

1667

errno = old_errno;

1182

1668

}

1183

1669

return false;

1184

1670

}

1671

if((close(s) == -1) and debug){

1672

old_errno = errno;

1673

perror_plus("close");

1674

errno = old_errno;

1675

}

1185

1676

return true;

1186

1677

}

1187

1678

1679

__attribute__((nonnull, warn_unused_result))

1188

1680

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

1189

1681

1190

1682

/* Reject the loopback device */

1232

1724

* corresponds to an acceptable network device.

1233

1725

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

1234

1726

*/

1727

__attribute__((nonnull, warn_unused_result))

1235

1728

int good_interface(const struct dirent *if_entry){

1236

1729

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

1237

1730

return 0;

1255

1748

/*

1256

1749

* This function determines if a network interface is up.

1257

1750

*/

1751

__attribute__((nonnull, warn_unused_result))

1258

1752

bool interface_is_up(const char *interface){

1259

1753

struct ifreq ifr;

1260

1754

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

1271

1765

/*

1272

1766

* This function determines if a network interface is running

1273

1767

*/

1768

__attribute__((nonnull, warn_unused_result))

1274

1769

bool interface_is_running(const char *interface){

1275

1770

struct ifreq ifr;

1276

1771

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

1284

1779

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

1285

1780

}

1286

1781

1782

__attribute__((nonnull, pure, warn_unused_result))

1287

1783

int notdotentries(const struct dirent *direntry){

1288

1784

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

1289

1785

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

1296

1792

}

1297

1793

1298

1794

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

1795

__attribute__((nonnull, warn_unused_result))

1299

1796

int runnable_hook(const struct dirent *direntry){

1300

1797

int ret;

1301

1798

size_t sret;

1309

1806

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

1310

1807

"abcdefghijklmnopqrstuvwxyz"

1311

1808

"0123456789"

1312

"_-");

1809

"_.-");

1313

1810

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

1314

1811

/* Contains non-allowed characters */

1315

1812

if(debug){

1319

1816

return 0;

1320

1817

}

1321

1818

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);

1819

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

1330

1820

if(ret == -1){

1331

1821

if(debug){

1332

1822

perror_plus("Could not stat hook");

1356

1846

return 1;

1357

1847

}

1358

1848

1849

__attribute__((nonnull, warn_unused_result))

1359

1850

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

1851

mandos_context *mc){

1361

1852

int ret;

1365

1856

1366

1857

while(true){

1367

1858

if(mc->current_server == NULL){

1368

if (debug){

1859

if(debug){

1369

1860

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

1370

1861

" No timeout!\n");

1371

1862

}

1372

1863

ret = avahi_simple_poll_iterate(s, -1);

1373

1864

} else {

1374

if (debug){

1865

if(debug){

1375

1866

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

1376

1867

" it, or wait\n");

1377

1868

}

1394

1885

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

1395

1886

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

1396

1887

1397

if (debug){

1888

if(debug){

1398

1889

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

1399

1890

block_time);

1400

1891

}

1422

1913

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

1423

1914

}

1424

1915

if(ret != 0){

1425

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

1916

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

1426

1917

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

1427

1918

}

1428

1919

}

1429

1920

}

1430

1921

}

1431

1922

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,

1923

__attribute__((nonnull))

1924

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

1485

1925

const float delay){

1486

struct dirent **direntries;

1926

struct dirent **direntries = NULL;

1927

if(hookdir_fd == -1){

1928

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1929

| O_CLOEXEC);

1930

if(hookdir_fd == -1){

1931

if(errno == ENOENT){

1932

if(debug){

1933

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

1934

" found\n", hookdir);

1935

}

1936

} else {

1937

perror_plus("open");

1938

}

1939

return;

1940

}

1941

}

1942

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

1943

if(devnull == -1){

1944

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

1945

return;

1946

}

1947

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

1948

runnable_hook, alphasort);

1949

if(numhooks == -1){

1950

perror_plus("scandir");

1951

close(devnull);

1952

return;

1953

}

1487

1954

struct dirent *direntry;

1488

1955

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");

1956

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

1957

direntry = direntries[i];

1958

if(debug){

1959

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

1960

direntry->d_name);

1499

1961

}

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){

1962

pid_t hook_pid = fork();

1963

if(hook_pid == 0){

1964

/* Child */

1965

/* Raise privileges */

1966

errno = raise_privileges_permanently();

1967

if(errno != 0){

1968

perror_plus("Failed to raise privileges");

1969

_exit(EX_NOPERM);

1970

}

1971

/* Set group */

1972

errno = 0;

1973

ret = setgid(0);

1974

if(ret == -1){

1975

perror_plus("setgid");

1976

_exit(EX_NOPERM);

1977

}

1978

/* Reset supplementary groups */

1979

errno = 0;

1980

ret = setgroups(0, NULL);

1981

if(ret == -1){

1982

perror_plus("setgroups");

1983

_exit(EX_NOPERM);

1984

}

1985

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

1986

if(ret == -1){

1987

perror_plus("setenv");

1988

_exit(EX_OSERR);

1989

}

1990

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

1991

if(ret == -1){

1992

perror_plus("setenv");

1993

_exit(EX_OSERR);

1994

}

1995

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

1996

if(ret == -1){

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

char *delaystring;

2006

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

2007

if(ret == -1){

1507

2008

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

}

2009

_exit(EX_OSERR);

2010

}

2011

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

2012

if(ret == -1){

1566

2013

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

}

2014

perror_plus("setenv");

2015

_exit(EX_OSERR);

2016

}

2017

free(delaystring);

2018

if(connect_to != NULL){

2019

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

2020

if(ret == -1){

2021

perror_plus("setenv");

2022

_exit(EX_OSERR);

2023

}

2024

}

2025

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

2026

direntry->d_name,

2027

O_RDONLY));

2028

if(hook_fd == -1){

2029

perror_plus("openat");

2030

_exit(EXIT_FAILURE);

2031

}

2032

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

2033

perror_plus("close");

2034

_exit(EXIT_FAILURE);

2035

}

2036

ret = dup2(devnull, STDIN_FILENO);

2037

if(ret == -1){

2038

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

2039

_exit(EX_OSERR);

2040

}

2041

ret = close(devnull);

2042

if(ret == -1){

2043

perror_plus("close");

2044

_exit(EX_OSERR);

2045

}

2046

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2047

if(ret == -1){

2048

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

2049

_exit(EX_OSERR);

2050

}

2051

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

2052

environ) == -1){

2053

perror_plus("fexecve");

2054

_exit(EXIT_FAILURE);

2055

}

2056

} else {

2057

if(hook_pid == -1){

2058

perror_plus("fork");

2059

free(direntry);

2060

continue;

2061

}

2062

int status;

2063

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

2064

perror_plus("waitpid");

2065

free(direntry);

2066

continue;

2067

}

2068

if(WIFEXITED(status)){

2069

if(WEXITSTATUS(status) != 0){

2070

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

2071

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

2072

WEXITSTATUS(status));

2073

free(direntry);

2074

continue;

2075

}

2076

} else if(WIFSIGNALED(status)){

2077

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

2078

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

2079

WTERMSIG(status));

2080

free(direntry);

2081

continue;

1578

2082

} 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;

2083

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

2084

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

2085

free(direntry);

2086

continue;

2087

}

2088

}

2089

if(debug){

2090

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

2091

direntry->d_name);

2092

}

2093

free(direntry);

2094

}

2095

free(direntries);

2096

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

2097

perror_plus("close");

2098

} else {

2099

hookdir_fd = -1;

2100

}

2101

close(devnull);

1615

2102

}

1616

2103

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;

2104

__attribute__((nonnull, warn_unused_result))

2105

int bring_up_interface(const char *const interface,

2106

const float delay){

2107

int old_errno = errno;

2108

int ret;

1623

2109

struct ifreq network;

1624

2110

unsigned int if_index = if_nametoindex(interface);

1625

2111

if(if_index == 0){

1634

2120

}

1635

2121

1636

2122

if(not interface_is_up(interface)){

1637

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

2123

int ret_errno = 0;

2124

int ioctl_errno = 0;

2125

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

1638

2126

ret_errno = errno;

1639

2127

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

1640

2128

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

2129

errno = old_errno;

1641

2130

return ret_errno;

1642

2131

}

1643

network.ifr_flags |= IFF_UP;

2132

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

1644

2133

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

2134

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

2135

if(sd == -1){

1647

2136

ret_errno = errno;

1648

2137

perror_plus("socket");

1649

2138

errno = old_errno;

1650

2139

return ret_errno;

1651

2140

}

1652

2141

1653

2142

if(quit_now){

1654

close(sd);

2143

ret = close(sd);

2144

if(ret == -1){

2145

perror_plus("close");

2146

}

1655

2147

errno = old_errno;

1656

2148

return EINTR;

1657

2149

}

1661

2153

interface);

1662

2154

}

1663

2155

1664

/* Raise priviliges */

1665

raise_privileges();

2156

/* Raise privileges */

2157

ret_errno = raise_privileges();

2158

if(ret_errno != 0){

2159

errno = ret_errno;

2160

perror_plus("Failed to raise privileges");

2161

}

1666

2162

1667

2163

#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");

2164

int ret_linux;

2165

bool restore_loglevel = false;

2166

if(ret_errno == 0){

2167

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2168

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

2169

ret_linux = klogctl(8, NULL, 5);

2170

if(ret_linux == -1){

2171

perror_plus("klogctl");

2172

} else {

2173

restore_loglevel = true;

2174

}

1675

2175

}

1676

2176

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

2177

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

2178

ioctl_errno = errno;

1679

2179

#ifdef __linux__

1680

2180

if(restore_loglevel){

1681

2181

ret_linux = klogctl(7, NULL, 0);

1685

2185

}

1686

2186

#endif /* __linux__ */

1687

2187

1688

/* Lower privileges */

1689

lower_privileges();

2188

/* If raise_privileges() succeeded above */

2189

if(ret_errno == 0){

2190

/* Lower privileges */

2191

ret_errno = lower_privileges();

2192

if(ret_errno != 0){

2193

errno = ret_errno;

2194

perror_plus("Failed to lower privileges");

2195

}

2196

}

1690

2197

1691

2198

/* Close the socket */

1692

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

2199

ret = close(sd);

1693

2200

if(ret == -1){

1694

2201

perror_plus("close");

1695

2202

}

1696

2203

1697

2204

if(ret_setflags == -1){

1698

errno = ret_errno;

2205

errno = ioctl_errno;

1699

2206

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

2207

errno = old_errno;

1701

return ret_errno;

2208

return ioctl_errno;

1702

2209

}

1703

2210

} else if(debug){

1704

2211

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

1707

2214

1708

2215

/* Sleep checking until interface is running.

1709

2216

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

1710

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

2217

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

1711

2218

if(interface_is_running(interface)){

1712

2219

break;

1713

2220

}

1722

2229

return 0;

1723

2230

}

1724

2231

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;

2232

__attribute__((nonnull, warn_unused_result))

2233

int take_down_interface(const char *const interface){

2234

int old_errno = errno;

1730

2235

struct ifreq network;

1731

2236

unsigned int if_index = if_nametoindex(interface);

1732

2237

if(if_index == 0){

1735

2240

return ENXIO;

1736

2241

}

1737

2242

if(interface_is_up(interface)){

2243

int ret_errno = 0;

2244

int ioctl_errno = 0;

1738

2245

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

1739

2246

ret_errno = errno;

1740

2247

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

1741

2248

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

2249

errno = old_errno;

1742

2250

return ret_errno;

1743

2251

}

1744

2252

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

1745

2253

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

2254

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

2255

if(sd == -1){

1748

2256

ret_errno = errno;

1749

2257

perror_plus("socket");

1750

2258

errno = old_errno;

1756

2264

interface);

1757

2265

}

1758

2266

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();

2267

/* Raise privileges */

2268

ret_errno = raise_privileges();

2269

if(ret_errno != 0){

2270

errno = ret_errno;

2271

perror_plus("Failed to raise privileges");

2272

}

2273

2274

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

2275

ioctl_errno = errno;

2276

2277

/* If raise_privileges() succeeded above */

2278

if(ret_errno == 0){

2279

/* Lower privileges */

2280

ret_errno = lower_privileges();

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("Failed to lower privileges");

2284

}

2285

}

1767

2286

1768

2287

/* Close the socket */

1769

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

2288

int ret = close(sd);

1770

2289

if(ret == -1){

1771

2290

perror_plus("close");

1772

2291

}

1773

2292

1774

2293

if(ret_setflags == -1){

1775

errno = ret_errno;

2294

errno = ioctl_errno;

1776

2295

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

2296

errno = old_errno;

1778

return ret_errno;

2297

return ioctl_errno;

1779

2298

}

1780

2299

} else if(debug){

1781

2300

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

1787

2306

}

1788

2307

1789

2308

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 };

2309

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

2310

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

2311

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

2312

.current_server = NULL, .interfaces = NULL,

2313

.interfaces_size = 0 };

1794

2314

AvahiSServiceBrowser *sb = NULL;

1795

2315

error_t ret_errno;

1796

2316

int ret;

1799

2319

int exitcode = EXIT_SUCCESS;

1800

2320

char *interfaces_to_take_down = NULL;

1801

2321

size_t interfaces_to_take_down_size = 0;

1802

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

1803

bool tempdir_created = false;

2322

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

2323

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

2324

char *tempdir = NULL;

1804

2325

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

2326

const char *seckey = PATHDIR "/" SECKEY;

1806

2327

const char *pubkey = PATHDIR "/" PUBKEY;

2328

const char *dh_params_file = NULL;

1807

2329

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

2330

1810

2331

bool gnutls_initialized = false;

1811

2332

bool gpgme_initialized = false;

1863

2384

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

1864

2385

" Diffie-Hellman key exchange",

1865

2386

.group = 2 },

2387

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

2388

.arg = "FILE",

2389

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

2390

" for the Diffie-Hellman key exchange",

2391

.group = 2 },

1866

2392

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

1867

2393

.arg = "STRING",

1868

2394

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

1923

2449

}

1924

2450

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

1925

2451

break;

2452

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

2453

dh_params_file = arg;

2454

break;

1926

2455

case 130: /* --priority */

1927

2456

mc.priority = arg;

1928

2457

break;

1968

2497

.args_doc = "",

1969

2498

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

1970

2499

" passwords from a Mandos server" };

1971

ret = argp_parse(&argp, argc, argv,

1972

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1973

switch(ret){

2500

ret_errno = argp_parse(&argp, argc, argv,

2501

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2502

switch(ret_errno){

1974

2503

case 0:

1975

2504

break;

1976

2505

case ENOMEM:

1977

2506

default:

1978

errno = ret;

2507

errno = ret_errno;

1979

2508

perror_plus("argp_parse");

1980

2509

exitcode = EX_OSERR;

1981

2510

goto end;

1984

2513

goto end;

1985

2514

}

1986

2515

}

1987

2516

1988

2517

{

1989

2518

/* Work around Debian bug #633582:

1990

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

2519

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

1991

2520

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2521

/* Re-raise privileges */

2522

ret = raise_privileges();

2523

if(ret != 0){

2524

errno = ret;

2525

perror_plus("Failed to raise privileges");

2526

} else {

1994

2527

struct stat st;

1995

2528

1996

2529

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

2010

2543

}

2011

2544

}

2012

2545

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2546

close(seckey_fd);

2014

2547

}

2015

2548

}

2016

2549

2017

2550

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

2018

2551

int pubkey_fd = open(pubkey, O_RDONLY);

2019

2552

if(pubkey_fd == -1){

2031

2564

}

2032

2565

}

2033

2566

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2567

close(pubkey_fd);

2568

}

2569

}

2570

2571

if(dh_params_file != NULL

2572

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

2573

int dhparams_fd = open(dh_params_file, O_RDONLY);

2574

if(dhparams_fd == -1){

2575

perror_plus("open");

2576

} else {

2577

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

2578

if(ret == -1){

2579

perror_plus("fstat");

2580

} else {

2581

if(S_ISREG(st.st_mode)

2582

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

2583

ret = fchown(dhparams_fd, uid, gid);

2584

if(ret == -1){

2585

perror_plus("fchown");

2586

}

2587

}

2588

}

2589

close(dhparams_fd);

2590

}

2591

}

2592

2038

2593

/* Lower privileges */

2039

lower_privileges();

2594

ret = lower_privileges();

2595

if(ret != 0){

2596

errno = ret;

2597

perror_plus("Failed to lower privileges");

2598

}

2040

2599

}

2041

2600

}

2042

2601

2066

2625

goto end;

2067

2626

}

2068

2627

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

}

2628

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

2629

}

2630

run_network_hooks("start", interfaces_hooks != NULL ?

2631

interfaces_hooks : "", delay);

2077

2632

}

2078

2633

2079

2634

if(not debug){

2157

2712

2158

2713

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

2159

2714

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2715

struct dirent **direntries = NULL;

2161

2716

/* Look for any good interfaces */

2162

2717

ret = scandir(sys_class_net, &direntries, good_interface,

2163

2718

alphasort);

2167

2722

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

2168

2723

direntries[i]->d_name);

2169

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2170

2726

perror_plus("argz_add");

2727

free(direntries[i]);

2171

2728

continue;

2172

2729

}

2173

2730

if(debug){

2174

2731

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

2175

2732

direntries[i]->d_name);

2176

2733

}

2734

free(direntries[i]);

2177

2735

}

2178

2736

free(direntries);

2179

2737

} else {

2180

free(direntries);

2738

if(ret == 0){

2739

free(direntries);

2740

}

2181

2741

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

2182

2742

exitcode = EXIT_FAILURE;

2183

2743

goto end;

2206

2766

break;

2207

2767

}

2208

2768

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2769

errno = bring_up_interface(interface, delay);

2210

2770

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2771

if(errno != 0){

2772

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

2773

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

2214

2774

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2775

errno = argz_add(&interfaces_to_take_down,

2776

&interfaces_to_take_down_size,

2777

interface);

2778

if(errno != 0){

2779

perror_plus("argz_add");

2780

}

2218

2781

}

2219

2782

}

2220

2783

}

2236

2799

goto end;

2237

2800

}

2238

2801

2239

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

2802

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

2240

2803

if(ret == -1){

2241

2804

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

2242

2805

exitcode = EX_UNAVAILABLE;

2249

2812

goto end;

2250

2813

}

2251

2814

2252

if(mkdtemp(tempdir) == NULL){

2815

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

2816

tempdir = mkdtemp(run_tempdir);

2817

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

2818

if(debug){

2819

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

2820

run_tempdir, old_tempdir);

2821

}

2822

tempdir = mkdtemp(old_tempdir);

2823

}

2824

if(tempdir == NULL){

2253

2825

perror_plus("mkdtemp");

2254

2826

goto end;

2255

2827

}

2256

tempdir_created = true;

2257

2828

2258

2829

if(quit_now){

2259

2830

goto end;

2331

2902

fprintf_plus(stderr, "Retrying in %d seconds\n",

2332

2903

(int)retry_interval);

2333

2904

}

2334

sleep((int)retry_interval);

2905

sleep((unsigned int)retry_interval);

2335

2906

}

2336

2907

2337

if (not quit_now){

2908

if(not quit_now){

2338

2909

exitcode = EXIT_SUCCESS;

2339

2910

}

2340

2911

2356

2927

2357

2928

/* Allocate a new server */

2358

2929

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2930

&config, NULL, NULL, &ret);

2360

2931

2361

2932

/* Free the Avahi configuration data */

2362

2933

avahi_server_config_free(&config);

2365

2936

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

2366

2937

if(mc.server == NULL){

2367

2938

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

2368

avahi_strerror(ret_errno));

2939

avahi_strerror(ret));

2369

2940

exitcode = EX_UNAVAILABLE;

2370

2941

goto end;

2371

2942

}

2395

2966

if(debug){

2396

2967

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

2397

2968

}

2398

2969

2399

2970

ret = avahi_loop_with_timeout(simple_poll,

2400

2971

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

2401

2972

if(debug){

2406

2977

end:

2407

2978

2408

2979

if(debug){

2409

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

2980

if(signal_received){

2981

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

2982

argv[0], signal_received,

2983

strsignal(signal_received));

2984

} else {

2985

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

2986

}

2410

2987

}

2411

2988

2412

2989

/* Cleanup things */

2423

3000

2424

3001

if(gnutls_initialized){

2425

3002

gnutls_certificate_free_credentials(mc.cred);

2426

gnutls_global_deinit();

2427

3003

gnutls_dh_params_deinit(mc.dh_params);

2428

3004

}

2429

3005

2437

3013

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

2438

3014

while(mc.current_server != NULL){

2439

3015

server *next = mc.current_server->next;

3016

#ifdef __GNUC__

3017

#pragma GCC diagnostic push

3018

#pragma GCC diagnostic ignored "-Wcast-qual"

3019

#endif

3020

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

3021

#ifdef __GNUC__

3022

#pragma GCC diagnostic pop

3023

#endif

2440

3024

free(mc.current_server);

2441

3025

mc.current_server = next;

2442

3026

}

2443

3027

}

2444

3028

2445

/* Re-raise priviliges */

3029

/* Re-raise privileges */

2446

3030

{

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();

3031

ret = raise_privileges();

3032

if(ret != 0){

3033

errno = ret;

3034

perror_plus("Failed to raise privileges");

3035

} else {

3036

3037

/* Run network hooks */

3038

run_network_hooks("stop", interfaces_hooks != NULL ?

3039

interfaces_hooks : "", delay);

3040

3041

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

3042

{

3043

char *interface = NULL;

3044

while((interface = argz_next(interfaces_to_take_down,

3045

interfaces_to_take_down_size,

3046

interface))){

3047

ret = take_down_interface(interface);

3048

if(ret != 0){

3049

errno = ret;

3050

perror_plus("Failed to take down interface");

3051

}

3052

}

3053

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

3054

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

3055

" down\n");

3056

}

3057

}

3058

}

3059

3060

ret = lower_privileges_permanently();

3061

if(ret != 0){

3062

errno = ret;

3063

perror_plus("Failed to lower privileges permanently");

3064

}

2472

3065

}

2473

3066

2474

3067

free(interfaces_to_take_down);

2475

3068

free(interfaces_hooks);

2476

3069

3070

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

3071

uintmax_t level){

3072

struct dirent **direntries = NULL;

3073

int dret;

3074

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

3075

O_RDONLY

3076

| O_NOFOLLOW

3077

| O_DIRECTORY

3078

| O_PATH));

3079

if(dir_fd == -1){

3080

perror_plus("open");

3081

return;

3082

}

3083

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

3084

notdotentries, alphasort);

3085

if(numentries >= 0){

3086

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

3087

if(debug){

3088

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

3089

dirname, direntries[i]->d_name);

3090

}

3091

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

3092

if(dret == -1){

3093

if(errno == EISDIR){

3094

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

3095

AT_REMOVEDIR);

3096

}

3097

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

3098

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

3099

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

3100

/* Recurse only in this special case */

3101

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

3102

dret = 0;

3103

}

3104

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

3105

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

3106

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

3107

}

3108

}

3109

free(direntries[i]);

3110

}

3111

3112

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

3113

free(direntries);

3114

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3115

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

3116

perror_plus("rmdir");

3117

}

3118

} else {

3119

perror_plus("scandirat");

3120

}

3121

close(dir_fd);

3122

}

3123

2477

3124

/* 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

}

3125

if(tempdir != NULL){

3126

clean_dir_at(-1, tempdir, 0);

2511

3127

}

2512

3128

2513

3129

if(quit_now){