/mandos/release : revision 237.7.207

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

10

*

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* Everything else is

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*

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* This file is part of Mandos.

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*

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* 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

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

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* (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

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*

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

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

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

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

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*

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

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21

* WITHOUT ANY WARRANTY; without even the implied warranty of

24

22

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

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23

* General Public License for more details.

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*

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

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

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* along with this program. If not, see

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

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28

*

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

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30

*/

33

32

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

34

33

#ifndef _LARGEFILE_SOURCE

35

34

#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

35

#endif

37

36

#ifndef _FILE_OFFSET_BITS

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37

#define _FILE_OFFSET_BITS 64

39

#endif /* not _FILE_OFFSET_BITS */

38

#endif

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39

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

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41

43

42

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

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stdout, ferror() */

43

stdout, ferror(), remove() */

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44

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

46

45

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

47

46

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

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47

strtof(), abort() */

49

48

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

50

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

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asprintf(), strncpy(), strsignal()

52

*/

49

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

50

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

53

51

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

54

52

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

55

53

sockaddr_in6, PF_INET6,

57

55

opendir(), DIR */

58

56

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

59

57

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

60

inet_pton(), connect(),

61

getnameinfo() */

62

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

58

inet_pton(), connect() */

59

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

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60

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

64

61

*/

65

62

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

66

63

strtoimax() */

67

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

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EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

64

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

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65

program_invocation_short_name */

73

66

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

74

67

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

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72

*/

80

73

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

81

74

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

82

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

83

unlinkat() */

84

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

75

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

76

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

85

77

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

86

78

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

87

79

argp_state, struct argp,

99

91

argz_delete(), argz_append(),

100

92

argz_stringify(), argz_add(),

101

93

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

104

94

105

95

#ifdef __linux__

106

96

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

148

138

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

149

139

char *connect_to = NULL;

150

140

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

152

141

uid_t uid = 65534;

153

142

gid_t gid = 65534;

154

143

191

180

perror(print_text);

192

181

}

193

182

194

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

183

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

195

184

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

196

185

va_list ap;

197

186

va_start (ap, format);

206

195

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

207

196

* "buffer_length" is how much is already used.

208

197

*/

209

__attribute__((nonnull, warn_unused_result))

210

198

size_t incbuffer(char **buffer, size_t buffer_length,

211

199

size_t buffer_capacity){

212

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

201

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

202

if(buffer == NULL){

219

203

return 0;

220

204

}

221

*buffer = new_buf;

222

205

buffer_capacity += BUFFER_SIZE;

223

206

}

224

207

return buffer_capacity;

225

208

}

226

209

227

210

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

228

__attribute__((nonnull, warn_unused_result))

229

211

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

230

212

int af, server **current_server){

231

213

int ret;

240

222

.af = af };

241

223

if(new_server->ip == NULL){

242

224

perror_plus("strdup");

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

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

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

258

225

return false;

259

226

}

260

227

/* Special case of first server */

262

229

new_server->next = new_server;

263

230

new_server->prev = new_server;

264

231

*current_server = new_server;

232

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

265

233

} else {

266

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

267

234

new_server->next = *current_server;

268

235

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

269

236

new_server->prev->next = new_server;

270

237

(*current_server)->prev = new_server;

271

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

272

244

return true;

273

245

}

274

246

275

247

/*

276

248

* Initialize GPGME.

277

249

*/

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){

250

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

251

const char *tempdir, mandos_context *mc){

283

252

gpgme_error_t rc;

284

253

gpgme_engine_info_t engine_info;

285

254

286

255

/*

287

256

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

288

257

*/

289

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

290

259

int ret;

291

260

int fd;

292

261

gpgme_data_t pgp_data;

311

280

return false;

312

281

}

313

282

314

ret = close(fd);

283

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

315

284

if(ret == -1){

316

285

perror_plus("close");

317

286

}

356

325

/* Create new GPGME "context" */

357

326

rc = gpgme_new(&(mc->ctx));

358

327

if(rc != GPG_ERR_NO_ERROR){

359

fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",

360

gpgme_strsource(rc), gpgme_strerror(rc));

328

fprintf_plus(stderr, "Mandos plugin mandos-client: "

329

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

330

gpgme_strerror(rc));

361

331

return false;

362

332

}

363

333

372

342

* Decrypt OpenPGP data.

373

343

* Returns -1 on error

374

344

*/

375

__attribute__((nonnull, warn_unused_result))

376

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

377

346

size_t crypto_size,

378

347

char **plaintext,

399

368

/* Create new empty GPGME data buffer for the plaintext */

400

369

rc = gpgme_data_new(&dh_plain);

401

370

if(rc != GPG_ERR_NO_ERROR){

402

fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",

371

fprintf_plus(stderr, "Mandos plugin mandos-client: "

372

"bad gpgme_data_new: %s: %s\n",

403

373

gpgme_strsource(rc), gpgme_strerror(rc));

404

374

gpgme_data_release(dh_crypto);

405

375

return -1;

418

388

if(result == NULL){

419

389

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

420

390

} else {

421

if(result->unsupported_algorithm != NULL) {

422

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

423

result->unsupported_algorithm);

424

}

425

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

426

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

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);

427

395

if(result->file_name != NULL){

428

396

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

429

397

}

499

467

return plaintext_length;

500

468

}

501

469

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){

470

static const char * safer_gnutls_strerror(int value){

511

471

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

513

475

}

514

476

515

477

/* GnuTLS log function callback */

516

__attribute__((nonnull))

517

478

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

518

479

const char* string){

519

480

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

520

481

}

521

482

522

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

523

483

static int init_gnutls_global(const char *pubkeyfilename,

524

484

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

485

mandos_context *mc){

527

486

int ret;

528

unsigned int uret;

529

487

530

488

if(debug){

531

489

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

532

490

}

533

491

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

534

499

if(debug){

535

500

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

536

501

* - GnuTLS manual

544

509

if(ret != GNUTLS_E_SUCCESS){

545

510

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

546

511

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

547

513

return -1;

548

514

}

549

515

574

540

safer_gnutls_strerror(ret));

575

541

goto globalfail;

576

542

}

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

ret = close(dhpfile);

617

if(ret == -1){

618

perror_plus("close");

619

}

620

if(params.data == NULL){

621

dhparamsfilename = NULL;

622

}

623

if(dhparamsfilename == NULL){

624

break;

625

}

626

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

627

GNUTLS_X509_FMT_PEM);

628

if(ret != GNUTLS_E_SUCCESS){

629

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

630

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

631

safer_gnutls_strerror(ret));

632

dhparamsfilename = NULL;

633

}

634

free(params.data);

635

} while(false);

636

}

637

if(dhparamsfilename == NULL){

638

if(mc->dh_bits == 0){

639

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

640

/* Try to read the private key file */

641

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

642

do {

643

int secfile = open(seckeyfilename, O_RDONLY);

644

if(secfile == -1){

645

perror_plus("open");

646

break;

647

}

648

size_t buffer_capacity = 0;

649

while(true){

650

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

651

(size_t)buffer.size,

652

(size_t)buffer_capacity);

653

if(buffer_capacity == 0){

654

perror_plus("incbuffer");

655

free(buffer.data);

656

buffer.data = NULL;

657

break;

658

}

659

ssize_t bytes_read = read(secfile,

660

buffer.data + buffer.size,

661

BUFFER_SIZE);

662

/* EOF */

663

if(bytes_read == 0){

664

break;

665

}

666

/* check bytes_read for failure */

667

if(bytes_read < 0){

668

perror_plus("read");

669

free(buffer.data);

670

buffer.data = NULL;

671

break;

672

}

673

buffer.size += (unsigned int)bytes_read;

674

}

675

close(secfile);

676

} while(false);

677

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

678

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

679

if(buffer.data != NULL){

680

{

681

gnutls_openpgp_privkey_t privkey = NULL;

682

ret = gnutls_openpgp_privkey_init(&privkey);

683

if(ret != GNUTLS_E_SUCCESS){

684

fprintf_plus(stderr, "Error initializing OpenPGP key"

685

" structure: %s",

686

safer_gnutls_strerror(ret));

687

free(buffer.data);

688

buffer.data = NULL;

689

} else {

690

ret = gnutls_openpgp_privkey_import

691

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

692

if(ret != GNUTLS_E_SUCCESS){

693

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

694

safer_gnutls_strerror(ret));

695

privkey = NULL;

696

}

697

free(buffer.data);

698

buffer.data = NULL;

699

if(privkey != NULL){

700

/* Use private key to suggest an appropriate

701

sec_param */

702

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

703

gnutls_openpgp_privkey_deinit(privkey);

704

if(debug){

705

fprintf_plus(stderr, "This OpenPGP key implies using"

706

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

707

safe_string(gnutls_sec_param_get_name

708

(sec_param)));

709

}

710

}

711

}

712

}

713

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

714

/* Err on the side of caution */

715

sec_param = GNUTLS_SEC_PARAM_ULTRA;

716

if(debug){

717

fprintf_plus(stderr, "Falling back to security parameter"

718

" \"%s\"\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)));

721

}

722

}

723

}

724

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

725

if(uret != 0){

726

mc->dh_bits = uret;

727

if(debug){

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

mc->dh_bits);

733

}

734

} else {

735

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

736

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

737

safe_string(gnutls_sec_param_get_name

738

(sec_param)),

739

safer_gnutls_strerror(ret));

740

goto globalfail;

741

}

742

} else if(debug){

743

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

744

mc->dh_bits);

745

}

746

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

747

if(ret != GNUTLS_E_SUCCESS){

748

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

749

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

750

safer_gnutls_strerror(ret));

751

goto globalfail;

752

}

753

}

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

754

550

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

755

551

756

552

return 0;

758

554

globalfail:

759

555

760

556

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

761

558

gnutls_dh_params_deinit(mc->dh_params);

762

559

return -1;

763

560

}

764

561

765

__attribute__((nonnull, warn_unused_result))

766

562

static int init_gnutls_session(gnutls_session_t *session,

767

563

mandos_context *mc){

768

564

int ret;

815

611

/* ignore client certificate if any. */

816

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

817

613

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

818

616

return 0;

819

617

}

820

618

822

620

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

823

621

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

824

622

825

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

826

__attribute__((warn_unused_result))

827

int raise_privileges(void){

828

int old_errno = errno;

829

int ret = 0;

830

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

831

ret = errno;

832

}

833

errno = old_errno;

834

return ret;

835

}

836

837

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

838

__attribute__((warn_unused_result))

839

int raise_privileges_permanently(void){

840

int old_errno = errno;

841

int ret = raise_privileges();

842

if(ret != 0){

843

errno = old_errno;

844

return ret;

845

}

846

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

847

ret = errno;

848

}

849

errno = old_errno;

850

return ret;

851

}

852

853

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

854

__attribute__((warn_unused_result))

855

int lower_privileges(void){

856

int old_errno = errno;

857

int ret = 0;

858

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

859

ret = errno;

860

}

861

errno = old_errno;

862

return ret;

863

}

864

865

/* Lower privileges permanently */

866

__attribute__((warn_unused_result))

867

int lower_privileges_permanently(void){

868

int old_errno = errno;

869

int ret = 0;

870

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

871

ret = errno;

872

}

873

errno = old_errno;

874

return ret;

875

}

876

877

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

878

__attribute__((nonnull, warn_unused_result))

879

static bool add_delete_local_route(const bool add,

880

const char *address,

881

AvahiIfIndex if_index){

882

int ret;

883

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

884

char add_arg[] = "add";

885

char delete_arg[] = "delete";

886

char debug_flag[] = "--debug";

887

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

888

if(pluginhelperdir == NULL){

889

if(debug){

890

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

891

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

892

}

893

return false;

894

}

895

896

char interface[IF_NAMESIZE];

897

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

898

perror_plus("if_indextoname");

899

return false;

900

}

901

902

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

903

if(devnull == -1){

904

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

905

return false;

906

}

907

pid_t pid = fork();

908

if(pid == 0){

909

/* Child */

910

/* Raise privileges */

911

errno = raise_privileges_permanently();

912

if(errno != 0){

913

perror_plus("Failed to raise privileges");

914

/* _exit(EX_NOPERM); */

915

} else {

916

/* Set group */

917

errno = 0;

918

ret = setgid(0);

919

if(ret == -1){

920

perror_plus("setgid");

921

_exit(EX_NOPERM);

922

}

923

/* Reset supplementary groups */

924

errno = 0;

925

ret = setgroups(0, NULL);

926

if(ret == -1){

927

perror_plus("setgroups");

928

_exit(EX_NOPERM);

929

}

930

}

931

ret = dup2(devnull, STDIN_FILENO);

932

if(ret == -1){

933

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

934

_exit(EX_OSERR);

935

}

936

ret = close(devnull);

937

if(ret == -1){

938

perror_plus("close");

939

_exit(EX_OSERR);

940

}

941

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

942

if(ret == -1){

943

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

944

_exit(EX_OSERR);

945

}

946

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

947

O_RDONLY

948

| O_DIRECTORY

949

| O_PATH

950

| O_CLOEXEC));

951

if(helperdir_fd == -1){

952

perror_plus("open");

953

_exit(EX_UNAVAILABLE);

954

}

955

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

956

helper, O_RDONLY));

957

if(helper_fd == -1){

958

perror_plus("openat");

959

close(helperdir_fd);

960

_exit(EX_UNAVAILABLE);

961

}

962

close(helperdir_fd);

963

#ifdef __GNUC__

964

#pragma GCC diagnostic push

965

#pragma GCC diagnostic ignored "-Wcast-qual"

966

#endif

967

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

968

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

969

interface, debug ? debug_flag : NULL, NULL },

970

environ) == -1){

971

#ifdef __GNUC__

972

#pragma GCC diagnostic pop

973

#endif

974

perror_plus("fexecve");

975

_exit(EXIT_FAILURE);

976

}

977

}

978

if(pid == -1){

979

perror_plus("fork");

980

return false;

981

}

982

int status;

983

pid_t pret = -1;

984

errno = 0;

985

do {

986

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

987

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

988

int errno_raising = 0;

989

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

990

errno_raising = errno;

991

perror_plus("Failed to raise privileges in order to"

992

" kill helper program");

993

}

994

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

995

perror_plus("kill");

996

}

997

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

998

perror_plus("Failed to lower privileges after killing"

999

" helper program");

1000

}

1001

return false;

1002

}

1003

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

1004

if(pret == -1){

1005

perror_plus("waitpid");

1006

return false;

1007

}

1008

if(WIFEXITED(status)){

1009

if(WEXITSTATUS(status) != 0){

1010

fprintf_plus(stderr, "Error: iprouteadddel exited"

1011

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

1012

return false;

1013

}

1014

return true;

1015

}

1016

if(WIFSIGNALED(status)){

1017

fprintf_plus(stderr, "Error: iprouteadddel died by"

1018

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

1019

return false;

1020

}

1021

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

1022

return false;

1023

}

1024

1025

__attribute__((nonnull, warn_unused_result))

1026

static bool add_local_route(const char *address,

1027

AvahiIfIndex if_index){

1028

if(debug){

1029

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

1030

}

1031

return add_delete_local_route(true, address, if_index);

1032

}

1033

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool delete_local_route(const char *address,

1036

AvahiIfIndex if_index){

1037

if(debug){

1038

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

1039

}

1040

return add_delete_local_route(false, address, if_index);

1041

}

1042

1043

623

/* Called when a Mandos server is found */

1044

__attribute__((nonnull, warn_unused_result))

1045

624

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

1046

625

AvahiIfIndex if_index,

1047

626

int af, mandos_context *mc){

1048

627

int ret, tcp_sd = -1;

1049

628

ssize_t sret;

1050

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1051

633

char *buffer = NULL;

1052

634

char *decrypted_buffer = NULL;

1053

635

size_t buffer_length = 0;

1056

638

int retval = -1;

1057

639

gnutls_session_t session;

1058

640

int pf; /* Protocol family */

1059

bool route_added = false;

1060

641

1061

642

errno = 0;

1062

643

1084

665

bool match = false;

1085

666

{

1086

667

char *interface = NULL;

1087

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

1088

mc->interfaces_size,

1089

interface))){

668

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

669

interface))){

1090

670

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

1091

671

match = true;

1092

672

break;

1121

701

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

1122

702

}

1123

703

1124

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

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1125

705

if(tcp_sd < 0){

1126

706

int e = errno;

1127

707

perror_plus("socket");

1134

714

goto mandos_end;

1135

715

}

1136

716

717

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

1137

718

if(af == AF_INET6){

1138

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

1139

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

1140

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

719

to.in6.sin6_family = (sa_family_t)af;

720

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

1141

721

} else { /* IPv4 */

1142

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

1143

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

1144

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

722

to.in.sin_family = (sa_family_t)af;

723

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

1145

724

}

1146

725

if(ret < 0 ){

1147

726

int e = errno;

1156

735

goto mandos_end;

1157

736

}

1158

737

if(af == AF_INET6){

1159

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

1160

if(IN6_IS_ADDR_LINKLOCAL

1161

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

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

1162

748

if(if_index == AVAHI_IF_UNSPEC){

1163

749

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

1164

750

" incomplete without a network interface\n");

1166

752

goto mandos_end;

1167

753

}

1168

754

/* Set the network interface number as scope */

1169

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

755

to.in6.sin6_scope_id = (uint32_t)if_index;

1170

756

}

1171

757

} else {

1172

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

758

to.in.sin_port = htons(port);

1173

759

}

1174

760

1175

761

if(quit_now){

1192

778

}

1193

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1194

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1195

if(af == AF_INET6){

1196

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

1197

sizeof(struct sockaddr_in6),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

} else {

1201

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

1202

sizeof(struct sockaddr_in),

1203

addrstr, sizeof(addrstr), NULL, 0,

1204

NI_NUMERICHOST);

1205

}

1206

if(ret == EAI_SYSTEM){

1207

perror_plus("getnameinfo");

1208

} else if(ret != 0) {

1209

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

1210

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

1211

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

1212

}

1213

}

1214

1215

if(quit_now){

1216

errno = EINTR;

1217

goto mandos_end;

1218

}

1219

1220

while(true){

1221

if(af == AF_INET6){

1222

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

1223

sizeof(struct sockaddr_in6));

1224

} else {

1225

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

1226

sizeof(struct sockaddr_in));

1227

}

1228

if(ret < 0){

1229

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

1230

and if_index != AVAHI_IF_UNSPEC

1231

and connect_to == NULL

1232

and not route_added and

1233

((af == AF_INET6 and not

1234

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1235

&to)->sin6_addr)))

1236

or (af == AF_INET and

1237

/* Not a a IPv4LL address */

1238

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

1239

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

1240

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

1241

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

1242

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

1243

connect to a Mandos server announced by Avahi on a server

1244

host with a global address. Work around this by retrying

1245

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

1246

1247

Avahi bug reference:

1248

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

1249

https://bugs.debian.org/587961

1250

*/

1251

if(debug){

1252

fprintf_plus(stderr, "Mandos server unreachable, trying"

1253

" direct route\n");

1254

}

1255

int e = errno;

1256

route_added = add_local_route(ip, if_index);

1257

if(route_added){

1258

continue;

1259

}

1260

errno = e;

1261

}

1262

if(errno != ECONNREFUSED or debug){

1263

int e = errno;

1264

perror_plus("connect");

1265

errno = e;

1266

}

1267

goto mandos_end;

1268

}

1269

1270

if(quit_now){

1271

errno = EINTR;

1272

goto mandos_end;

1273

}

1274

break;

781

const char *pcret;

782

if(af == AF_INET6){

783

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

784

sizeof(addrstr));

785

} else {

786

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

787

sizeof(addrstr));

788

}

789

if(pcret == NULL){

790

perror_plus("inet_ntop");

791

} else {

792

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

793

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

794

}

795

}

796

}

797

798

if(quit_now){

799

errno = EINTR;

800

goto mandos_end;

801

}

802

803

if(af == AF_INET6){

804

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

805

} else {

806

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

807

}

808

if(ret < 0){

809

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

810

int e = errno;

811

perror_plus("connect");

812

errno = e;

813

}

814

goto mandos_end;

815

}

816

817

if(quit_now){

818

errno = EINTR;

819

goto mandos_end;

1275

820

}

1276

821

1277

822

const char *out = mandos_protocol_version;

1431

976

&decrypted_buffer, mc);

1432

977

if(decrypted_buffer_size >= 0){

1433

978

1434

clearerr(stdout);

1435

979

written = 0;

1436

980

while(written < (size_t) decrypted_buffer_size){

1437

981

if(quit_now){

1453

997

}

1454

998

written += (size_t)ret;

1455

999

}

1456

ret = fflush(stdout);

1457

if(ret != 0){

1458

int e = errno;

1459

if(debug){

1460

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

1461

strerror(errno));

1462

}

1463

errno = e;

1464

goto mandos_end;

1465

}

1466

1000

retval = 0;

1467

1001

}

1468

1002

}

1471

1005

1472

1006

mandos_end:

1473

1007

{

1474

if(route_added){

1475

if(not delete_local_route(ip, if_index)){

1476

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

1477

" interface %d", ip, if_index);

1478

}

1479

}

1480

1008

int e = errno;

1481

1009

free(decrypted_buffer);

1482

1010

free(buffer);

1483

1011

if(tcp_sd >= 0){

1484

ret = close(tcp_sd);

1012

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

1485

1013

}

1486

1014

if(ret == -1){

1487

1015

if(e == 0){

1512

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1513

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1514

1042

flags,

1515

void *mc){

1043

void* mc){

1516

1044

if(r == NULL){

1517

1045

return;

1518

1046

}

1521

1049

timed out */

1522

1050

1523

1051

if(quit_now){

1524

avahi_s_service_resolver_free(r);

1525

1052

return;

1526

1053

}

1527

1054

1572

1099

const char *domain,

1573

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1574

1101

flags,

1575

void *mc){

1102

void* mc){

1576

1103

if(b == NULL){

1577

1104

return;

1578

1105

}

1638

1165

errno = old_errno;

1639

1166

}

1640

1167

1641

__attribute__((nonnull, warn_unused_result))

1642

1168

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

1643

1169

int ret;

1644

int old_errno;

1170

error_t ret_errno;

1645

1171

1646

1172

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

1647

1173

if(s < 0){

1648

old_errno = errno;

1174

ret_errno = errno;

1649

1175

perror_plus("socket");

1650

errno = old_errno;

1176

errno = ret_errno;

1651

1177

return false;

1652

1178

}

1653

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

1654

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

1179

strcpy(ifr->ifr_name, ifname);

1655

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1656

1181

if(ret == -1){

1657

1182

if(debug){

1658

old_errno = errno;

1183

ret_errno = errno;

1659

1184

perror_plus("ioctl SIOCGIFFLAGS");

1660

errno = old_errno;

1661

}

1662

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

1663

old_errno = errno;

1664

perror_plus("close");

1665

errno = old_errno;

1185

errno = ret_errno;

1666

1186

}

1667

1187

return false;

1668

1188

}

1669

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

1670

old_errno = errno;

1671

perror_plus("close");

1672

errno = old_errno;

1673

}

1674

1189

return true;

1675

1190

}

1676

1191

1677

__attribute__((nonnull, warn_unused_result))

1678

1192

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

1679

1193

1680

1194

/* Reject the loopback device */

1722

1236

* corresponds to an acceptable network device.

1723

1237

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

1724

1238

*/

1725

__attribute__((nonnull, warn_unused_result))

1726

1239

int good_interface(const struct dirent *if_entry){

1727

1240

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

1728

1241

return 0;

1746

1259

/*

1747

1260

* This function determines if a network interface is up.

1748

1261

*/

1749

__attribute__((nonnull, warn_unused_result))

1750

1262

bool interface_is_up(const char *interface){

1751

1263

struct ifreq ifr;

1752

1264

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

1763

1275

/*

1764

1276

* This function determines if a network interface is running

1765

1277

*/

1766

__attribute__((nonnull, warn_unused_result))

1767

1278

bool interface_is_running(const char *interface){

1768

1279

struct ifreq ifr;

1769

1280

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

1777

1288

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

1778

1289

}

1779

1290

1780

__attribute__((nonnull, pure, warn_unused_result))

1781

1291

int notdotentries(const struct dirent *direntry){

1782

1292

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

1783

1293

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

1790

1300

}

1791

1301

1792

1302

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

1793

__attribute__((nonnull, warn_unused_result))

1794

1303

int runnable_hook(const struct dirent *direntry){

1795

1304

int ret;

1796

1305

size_t sret;

1804

1313

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

1805

1314

"abcdefghijklmnopqrstuvwxyz"

1806

1315

"0123456789"

1807

"_.-");

1316

"_-");

1808

1317

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

1809

1318

/* Contains non-allowed characters */

1810

1319

if(debug){

1814

1323

return 0;

1815

1324

}

1816

1325

1817

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

1326

char *fullname = NULL;

1327

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

1328

if(ret < 0){

1329

perror_plus("asprintf");

1330

return 0;

1331

}

1332

1333

ret = stat(fullname, &st);

1818

1334

if(ret == -1){

1819

1335

if(debug){

1820

1336

perror_plus("Could not stat hook");

1844

1360

return 1;

1845

1361

}

1846

1362

1847

__attribute__((nonnull, warn_unused_result))

1848

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1849

1364

mandos_context *mc){

1850

1365

int ret;

1854

1369

1855

1370

while(true){

1856

1371

if(mc->current_server == NULL){

1857

if(debug){

1372

if (debug){

1858

1373

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

1859

1374

" No timeout!\n");

1860

1375

}

1861

1376

ret = avahi_simple_poll_iterate(s, -1);

1862

1377

} else {

1863

if(debug){

1378

if (debug){

1864

1379

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

1865

1380

" it, or wait\n");

1866

1381

}

1883

1398

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

1884

1399

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

1885

1400

1886

if(debug){

1401

if (debug){

1887

1402

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

1888

1403

block_time);

1889

1404

}

1911

1426

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

1912

1427

}

1913

1428

if(ret != 0){

1914

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

1429

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

1915

1430

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

1916

1431

}

1917

1432

}

1918

1433

}

1919

1434

}

1920

1435

1921

__attribute__((nonnull))

1922

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

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1488

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

1923

1489

const float delay){

1924

struct dirent **direntries = NULL;

1925

if(hookdir_fd == -1){

1926

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1927

| O_CLOEXEC);

1928

if(hookdir_fd == -1){

1929

if(errno == ENOENT){

1930

if(debug){

1931

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

1932

" found\n", hookdir);

1933

}

1934

} else {

1935

perror_plus("open");

1936

}

1937

return;

1938

}

1939

}

1940

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

1941

if(devnull == -1){

1942

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

1943

return;

1944

}

1945

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

1946

runnable_hook, alphasort);

1490

struct dirent **direntries;

1491

struct dirent *direntry;

1492

int ret;

1493

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

1494

alphasort);

1947

1495

if(numhooks == -1){

1948

perror_plus("scandir");

1949

close(devnull);

1950

return;

1951

}

1952

struct dirent *direntry;

1953

int ret;

1954

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

1955

direntry = direntries[i];

1956

if(debug){

1957

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

1958

direntry->d_name);

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1959

1503

}

1960

pid_t hook_pid = fork();

1961

if(hook_pid == 0){

1962

/* Child */

1963

/* Raise privileges */

1964

errno = raise_privileges_permanently();

1965

if(errno != 0){

1966

perror_plus("Failed to raise privileges");

1967

_exit(EX_NOPERM);

1968

}

1969

/* Set group */

1970

errno = 0;

1971

ret = setgid(0);

1972

if(ret == -1){

1973

perror_plus("setgid");

1974

_exit(EX_NOPERM);

1975

}

1976

/* Reset supplementary groups */

1977

errno = 0;

1978

ret = setgroups(0, NULL);

1979

if(ret == -1){

1980

perror_plus("setgroups");

1981

_exit(EX_NOPERM);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

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

1999

if(ret == -1){

2000

perror_plus("setenv");

2001

_exit(EX_OSERR);

2002

}

2003

char *delaystring;

2004

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

2005

if(ret == -1){

1504

} else {

1505

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

1506

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

1507

direntry = direntries[i];

1508

char *fullname = NULL;

1509

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

1510

if(ret < 0){

2006

1511

perror_plus("asprintf");

2007

_exit(EX_OSERR);

2008

}

2009

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

2010

if(ret == -1){

1512

continue;

1513

}

1514

if(debug){

1515

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

1516

direntry->d_name);

1517

}

1518

pid_t hook_pid = fork();

1519

if(hook_pid == 0){

1520

/* Child */

1521

/* Raise privileges */

1522

raise_privileges_permanently();

1523

/* Set group */

1524

errno = 0;

1525

ret = setgid(0);

1526

if(ret == -1){

1527

perror_plus("setgid");

1528

}

1529

/* Reset supplementary groups */

1530

errno = 0;

1531

ret = setgroups(0, NULL);

1532

if(ret == -1){

1533

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1538

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

1539

if(ret == -1){

1540

perror_plus("setenv");

1541

_exit(EX_OSERR);

1542

}

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

char *delaystring;

1559

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

1560

if(ret == -1){

1561

perror_plus("asprintf");

1562

_exit(EX_OSERR);

1563

}

1564

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

1565

if(ret == -1){

1566

free(delaystring);

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

2011

1570

free(delaystring);

2012

perror_plus("setenv");

2013

_exit(EX_OSERR);

2014

}

2015

free(delaystring);

2016

if(connect_to != NULL){

2017

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

2018

if(ret == -1){

2019

perror_plus("setenv");

2020

_exit(EX_OSERR);

2021

}

2022

}

2023

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

2024

direntry->d_name,

2025

O_RDONLY));

2026

if(hook_fd == -1){

2027

perror_plus("openat");

2028

_exit(EXIT_FAILURE);

2029

}

2030

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

2031

perror_plus("close");

2032

_exit(EXIT_FAILURE);

2033

}

2034

ret = dup2(devnull, STDIN_FILENO);

2035

if(ret == -1){

2036

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

2037

_exit(EX_OSERR);

2038

}

2039

ret = close(devnull);

2040

if(ret == -1){

2041

perror_plus("close");

2042

_exit(EX_OSERR);

2043

}

2044

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2045

if(ret == -1){

2046

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

2047

_exit(EX_OSERR);

2048

}

2049

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

2050

environ) == -1){

2051

perror_plus("fexecve");

2052

_exit(EXIT_FAILURE);

2053

}

2054

} else {

2055

if(hook_pid == -1){

2056

perror_plus("fork");

2057

free(direntry);

2058

continue;

2059

}

2060

int status;

2061

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

2062

perror_plus("waitpid");

2063

free(direntry);

2064

continue;

2065

}

2066

if(WIFEXITED(status)){

2067

if(WEXITSTATUS(status) != 0){

2068

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

2069

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

2070

WEXITSTATUS(status));

2071

free(direntry);

2072

continue;

2073

}

2074

} else if(WIFSIGNALED(status)){

2075

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

2076

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

2077

WTERMSIG(status));

2078

free(direntry);

2079

continue;

1571

if(connect_to != NULL){

1572

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

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

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

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

2080

1582

} else {

2081

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

2082

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

2083

free(direntry);

2084

continue;

2085

}

2086

}

2087

if(debug){

2088

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

2089

direntry->d_name);

2090

}

2091

free(direntry);

2092

}

2093

free(direntries);

2094

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

2095

perror_plus("close");

2096

} else {

2097

hookdir_fd = -1;

2098

}

2099

close(devnull);

1583

int status;

1584

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

1585

perror_plus("waitpid");

1586

free(fullname);

1587

continue;

1588

}

1589

if(WIFEXITED(status)){

1590

if(WEXITSTATUS(status) != 0){

1591

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

1592

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

1593

WEXITSTATUS(status));

1594

free(fullname);

1595

continue;

1596

}

1597

} else if(WIFSIGNALED(status)){

1598

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

1599

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

1600

WTERMSIG(status));

1601

free(fullname);

1602

continue;

1603

} else {

1604

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

1605

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

1606

free(fullname);

1607

continue;

1608

}

1609

}

1610

free(fullname);

1611

if(debug){

1612

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

1613

direntry->d_name);

1614

}

1615

}

1616

close(devnull);

1617

}

1618

return true;

2100

1619

}

2101

1620

2102

__attribute__((nonnull, warn_unused_result))

2103

int bring_up_interface(const char *const interface,

2104

const float delay){

2105

int old_errno = errno;

2106

int ret;

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

2107

1627

struct ifreq network;

2108

1628

unsigned int if_index = if_nametoindex(interface);

2109

1629

if(if_index == 0){

2118

1638

}

2119

1639

2120

1640

if(not interface_is_up(interface)){

2121

int ret_errno = 0;

2122

int ioctl_errno = 0;

2123

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

1641

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

2124

1642

ret_errno = errno;

2125

1643

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

2126

1644

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

2127

errno = old_errno;

2128

1645

return ret_errno;

2129

1646

}

2130

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

1647

network.ifr_flags |= IFF_UP;

2131

1648

2132

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

2133

if(sd == -1){

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

2134

1651

ret_errno = errno;

2135

1652

perror_plus("socket");

2136

1653

errno = old_errno;

2137

1654

return ret_errno;

2138

1655

}

2139

1656

2140

1657

if(quit_now){

2141

ret = close(sd);

2142

if(ret == -1){

2143

perror_plus("close");

2144

}

1658

close(sd);

2145

1659

errno = old_errno;

2146

1660

return EINTR;

2147

1661

}

2151

1665

interface);

2152

1666

}

2153

1667

2154

/* Raise privileges */

2155

ret_errno = raise_privileges();

2156

if(ret_errno != 0){

2157

errno = ret_errno;

2158

perror_plus("Failed to raise privileges");

2159

}

1668

/* Raise priviliges */

1669

raise_privileges();

2160

1670

2161

1671

#ifdef __linux__

2162

int ret_linux;

2163

bool restore_loglevel = false;

2164

if(ret_errno == 0){

2165

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2166

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

2167

ret_linux = klogctl(8, NULL, 5);

2168

if(ret_linux == -1){

2169

perror_plus("klogctl");

2170

} else {

2171

restore_loglevel = true;

2172

}

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

2173

1679

}

2174

1680

#endif /* __linux__ */

2175

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

2176

ioctl_errno = errno;

1681

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

1682

ret_errno = errno;

2177

1683

#ifdef __linux__

2178

1684

if(restore_loglevel){

2179

1685

ret_linux = klogctl(7, NULL, 0);

2183

1689

}

2184

1690

#endif /* __linux__ */

2185

1691

2186

/* If raise_privileges() succeeded above */

2187

if(ret_errno == 0){

2188

/* Lower privileges */

2189

ret_errno = lower_privileges();

2190

if(ret_errno != 0){

2191

errno = ret_errno;

2192

perror_plus("Failed to lower privileges");

2193

}

2194

}

1692

/* Lower privileges */

1693

lower_privileges();

2195

1694

2196

1695

/* Close the socket */

2197

ret = close(sd);

1696

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

2198

1697

if(ret == -1){

2199

1698

perror_plus("close");

2200

1699

}

2201

1700

2202

1701

if(ret_setflags == -1){

2203

errno = ioctl_errno;

1702

errno = ret_errno;

2204

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2205

1704

errno = old_errno;

2206

return ioctl_errno;

1705

return ret_errno;

2207

1706

}

2208

1707

} else if(debug){

2209

1708

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

2212

1711

2213

1712

/* Sleep checking until interface is running.

2214

1713

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

2215

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

1714

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

2216

1715

if(interface_is_running(interface)){

2217

1716

break;

2218

1717

}

2227

1726

return 0;

2228

1727

}

2229

1728

2230

__attribute__((nonnull, warn_unused_result))

2231

int take_down_interface(const char *const interface){

2232

int old_errno = errno;

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

2233

1734

struct ifreq network;

2234

1735

unsigned int if_index = if_nametoindex(interface);

2235

1736

if(if_index == 0){

2238

1739

return ENXIO;

2239

1740

}

2240

1741

if(interface_is_up(interface)){

2241

int ret_errno = 0;

2242

int ioctl_errno = 0;

2243

1742

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

2244

1743

ret_errno = errno;

2245

1744

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

2246

1745

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

2247

errno = old_errno;

2248

1746

return ret_errno;

2249

1747

}

2250

1748

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

2251

1749

2252

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

2253

if(sd == -1){

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

2254

1752

ret_errno = errno;

2255

1753

perror_plus("socket");

2256

1754

errno = old_errno;

2262

1760

interface);

2263

1761

}

2264

1762

2265

/* Raise privileges */

2266

ret_errno = raise_privileges();

2267

if(ret_errno != 0){

2268

errno = ret_errno;

2269

perror_plus("Failed to raise privileges");

2270

}

2271

2272

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

2273

ioctl_errno = errno;

2274

2275

/* If raise_privileges() succeeded above */

2276

if(ret_errno == 0){

2277

/* Lower privileges */

2278

ret_errno = lower_privileges();

2279

if(ret_errno != 0){

2280

errno = ret_errno;

2281

perror_plus("Failed to lower privileges");

2282

}

2283

}

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

2284

1771

2285

1772

/* Close the socket */

2286

int ret = close(sd);

1773

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

2287

1774

if(ret == -1){

2288

1775

perror_plus("close");

2289

1776

}

2290

1777

2291

1778

if(ret_setflags == -1){

2292

errno = ioctl_errno;

1779

errno = ret_errno;

2293

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2294

1781

errno = old_errno;

2295

return ioctl_errno;

1782

return ret_errno;

2296

1783

}

2297

1784

} else if(debug){

2298

1785

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

2304

1791

}

2305

1792

2306

1793

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

2307

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

2308

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

2309

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

2310

.current_server = NULL, .interfaces = NULL,

2311

.interfaces_size = 0 };

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

2312

1798

AvahiSServiceBrowser *sb = NULL;

2313

1799

error_t ret_errno;

2314

1800

int ret;

2317

1803

int exitcode = EXIT_SUCCESS;

2318

1804

char *interfaces_to_take_down = NULL;

2319

1805

size_t interfaces_to_take_down_size = 0;

2320

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

2321

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

2322

char *tempdir = NULL;

1806

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

1807

bool tempdir_created = false;

2323

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2324

1809

const char *seckey = PATHDIR "/" SECKEY;

2325

1810

const char *pubkey = PATHDIR "/" PUBKEY;

2326

const char *dh_params_file = NULL;

2327

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

2328

1813

2329

1814

bool gnutls_initialized = false;

2330

1815

bool gpgme_initialized = false;

2382

1867

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

2383

1868

" Diffie-Hellman key exchange",

2384

1869

.group = 2 },

2385

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

2386

.arg = "FILE",

2387

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

2388

" for the Diffie-Hellman key exchange",

2389

.group = 2 },

2390

1870

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

2391

1871

.arg = "STRING",

2392

1872

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

2447

1927

}

2448

1928

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

2449

1929

break;

2450

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

2451

dh_params_file = arg;

2452

break;

2453

1930

case 130: /* --priority */

2454

1931

mc.priority = arg;

2455

1932

break;

2495

1972

.args_doc = "",

2496

1973

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

2497

1974

" passwords from a Mandos server" };

2498

ret_errno = argp_parse(&argp, argc, argv,

2499

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2500

switch(ret_errno){

1975

ret = argp_parse(&argp, argc, argv,

1976

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1977

switch(ret){

2501

1978

case 0:

2502

1979

break;

2503

1980

case ENOMEM:

2504

1981

default:

2505

errno = ret_errno;

1982

errno = ret;

2506

1983

perror_plus("argp_parse");

2507

1984

exitcode = EX_OSERR;

2508

1985

goto end;

2511

1988

goto end;

2512

1989

}

2513

1990

}

2514

1991

2515

1992

{

2516

1993

/* Work around Debian bug #633582:

2517

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

1994

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

2518

1995

2519

/* Re-raise privileges */

2520

ret = raise_privileges();

2521

if(ret != 0){

2522

errno = ret;

2523

perror_plus("Failed to raise privileges");

2524

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2525

1998

struct stat st;

2526

1999

2527

2000

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

2541

2014

}

2542

2015

}

2543

2016

}

2544

close(seckey_fd);

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2545

2018

}

2546

2019

}

2547

2020

2548

2021

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

2549

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2550

2023

if(pubkey_fd == -1){

2562

2035

}

2563

2036

}

2564

2037

}

2565

close(pubkey_fd);

2566

}

2567

}

2568

2569

if(dh_params_file != NULL

2570

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

2571

int dhparams_fd = open(dh_params_file, O_RDONLY);

2572

if(dhparams_fd == -1){

2573

perror_plus("open");

2574

} else {

2575

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

2576

if(ret == -1){

2577

perror_plus("fstat");

2578

} else {

2579

if(S_ISREG(st.st_mode)

2580

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

2581

ret = fchown(dhparams_fd, uid, gid);

2582

if(ret == -1){

2583

perror_plus("fchown");

2584

}

2585

}

2586

}

2587

close(dhparams_fd);

2588

}

2589

}

2590

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2591

2042

/* Lower privileges */

2592

ret = lower_privileges();

2593

if(ret != 0){

2594

errno = ret;

2595

perror_plus("Failed to lower privileges");

2596

}

2043

lower_privileges();

2597

2044

}

2598

2045

}

2599

2046

2623

2070

goto end;

2624

2071

}

2625

2072

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

2626

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

2627

}

2628

run_network_hooks("start", interfaces_hooks != NULL ?

2629

interfaces_hooks : "", delay);

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2630

2081

}

2631

2082

2632

2083

if(not debug){

2710

2161

2711

2162

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

2712

2163

if(mc.interfaces == NULL){

2713

struct dirent **direntries = NULL;

2164

struct dirent **direntries;

2714

2165

/* Look for any good interfaces */

2715

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2716

2167

alphasort);

2720

2171

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

2721

2172

direntries[i]->d_name);

2722

2173

if(ret_errno != 0){

2723

errno = ret_errno;

2724

2174

perror_plus("argz_add");

2725

free(direntries[i]);

2726

2175

continue;

2727

2176

}

2728

2177

if(debug){

2729

2178

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

2730

2179

direntries[i]->d_name);

2731

2180

}

2732

free(direntries[i]);

2733

2181

}

2734

2182

free(direntries);

2735

2183

} else {

2736

if(ret == 0){

2737

free(direntries);

2738

}

2184

free(direntries);

2739

2185

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

2740

2186

exitcode = EXIT_FAILURE;

2741

2187

goto end;

2764

2210

break;

2765

2211

}

2766

2212

bool interface_was_up = interface_is_up(interface);

2767

errno = bring_up_interface(interface, delay);

2213

ret = bring_up_interface(interface, delay);

2768

2214

if(not interface_was_up){

2769

if(errno != 0){

2770

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

2771

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

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2772

2218

} else {

2773

errno = argz_add(&interfaces_to_take_down,

2774

&interfaces_to_take_down_size,

2775

interface);

2776

if(errno != 0){

2777

perror_plus("argz_add");

2778

}

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2779

2222

}

2780

2223

}

2781

2224

}

2797

2240

goto end;

2798

2241

}

2799

2242

2800

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

2243

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

2801

2244

if(ret == -1){

2802

2245

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

2803

2246

exitcode = EX_UNAVAILABLE;

2810

2253

goto end;

2811

2254

}

2812

2255

2813

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

2814

tempdir = mkdtemp(run_tempdir);

2815

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

2816

if(debug){

2817

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

2818

run_tempdir, old_tempdir);

2819

}

2820

tempdir = mkdtemp(old_tempdir);

2821

}

2822

if(tempdir == NULL){

2256

if(mkdtemp(tempdir) == NULL){

2823

2257

perror_plus("mkdtemp");

2824

2258

goto end;

2825

2259

}

2260

tempdir_created = true;

2826

2261

2827

2262

if(quit_now){

2828

2263

goto end;

2903

2338

sleep((unsigned int)retry_interval);

2904

2339

}

2905

2340

2906

if(not quit_now){

2341

if (not quit_now){

2907

2342

exitcode = EXIT_SUCCESS;

2908

2343

}

2909

2344

2925

2360

2926

2361

/* Allocate a new server */

2927

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2928

&config, NULL, NULL, &ret);

2363

&config, NULL, NULL, &ret_errno);

2929

2364

2930

2365

/* Free the Avahi configuration data */

2931

2366

avahi_server_config_free(&config);

2934

2369

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

2935

2370

if(mc.server == NULL){

2936

2371

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

2937

avahi_strerror(ret));

2372

avahi_strerror(ret_errno));

2938

2373

exitcode = EX_UNAVAILABLE;

2939

2374

goto end;

2940

2375

}

2964

2399

if(debug){

2965

2400

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

2966

2401

}

2967

2402

2968

2403

ret = avahi_loop_with_timeout(simple_poll,

2969

2404

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

2970

2405

if(debug){

2975

2410

end:

2976

2411

2977

2412

if(debug){

2978

if(signal_received){

2979

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

2980

argv[0], signal_received,

2981

strsignal(signal_received));

2982

} else {

2983

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

2984

}

2413

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

2985

2414

}

2986

2415

2987

2416

/* Cleanup things */

2998

2427

2999

2428

if(gnutls_initialized){

3000

2429

gnutls_certificate_free_credentials(mc.cred);

2430

gnutls_global_deinit();

3001

2431

gnutls_dh_params_deinit(mc.dh_params);

3002

2432

}

3003

2433

3011

2441

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

3012

2442

while(mc.current_server != NULL){

3013

2443

server *next = mc.current_server->next;

3014

#ifdef __GNUC__

3015

#pragma GCC diagnostic push

3016

#pragma GCC diagnostic ignored "-Wcast-qual"

3017

#endif

3018

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

3019

#ifdef __GNUC__

3020

#pragma GCC diagnostic pop

3021

#endif

3022

2444

free(mc.current_server);

3023

2445

mc.current_server = next;

3024

2446

}

3025

2447

}

3026

2448

3027

/* Re-raise privileges */

2449

/* Re-raise priviliges */

3028

2450

{

3029

ret = raise_privileges();

3030

if(ret != 0){

3031

errno = ret;

3032

perror_plus("Failed to raise privileges");

3033

} else {

3034

3035

/* Run network hooks */

3036

run_network_hooks("stop", interfaces_hooks != NULL ?

3037

interfaces_hooks : "", delay);

3038

3039

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

3040

{

3041

char *interface = NULL;

3042

while((interface = argz_next(interfaces_to_take_down,

3043

interfaces_to_take_down_size,

3044

interface))){

3045

ret = take_down_interface(interface);

3046

if(ret != 0){

3047

errno = ret;

3048

perror_plus("Failed to take down interface");

3049

}

3050

}

3051

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

3052

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

3053

" down\n");

3054

}

3055

}

3056

}

3057

3058

ret = lower_privileges_permanently();

3059

if(ret != 0){

3060

errno = ret;

3061

perror_plus("Failed to lower privileges permanently");

3062

}

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2467

}

2468

}

2469

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

2470

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

2471

" down\n");

2472

}

2473

}

2474

2475

lower_privileges_permanently();

3063

2476

}

3064

2477

3065

2478

free(interfaces_to_take_down);

3066

2479

free(interfaces_hooks);

3067

2480

3068

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

3069

uintmax_t level){

2481

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

2482

if(tempdir_created){

3070

2483

struct dirent **direntries = NULL;

3071

int dret;

3072

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

3073

O_RDONLY

3074

| O_NOFOLLOW

3075

| O_DIRECTORY

3076

| O_PATH));

3077

if(dir_fd == -1){

3078

perror_plus("open");

3079

return;

3080

}

3081

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

3082

notdotentries, alphasort);

3083

if(numentries >= 0){

2484

struct dirent *direntry = NULL;

2485

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

2486

alphasort);

2487

if (numentries > 0){

3084

2488

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

3085

if(debug){

3086

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

3087

dirname, direntries[i]->d_name);

3088

}

3089

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

3090

if(dret == -1){

3091

if(errno == EISDIR){

3092

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

3093

AT_REMOVEDIR);

3094

}

3095

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

3096

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

3097

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

3098

/* Recurse only in this special case */

3099

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

3100

dret = 0;

3101

}

3102

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

3103

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

3104

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

3105

}

3106

}

3107

free(direntries[i]);

3108

}

3109

3110

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

3111

free(direntries);

3112

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3113

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

3114

perror_plus("rmdir");

3115

}

3116

} else {

3117

perror_plus("scandirat");

3118

}

3119

close(dir_fd);

3120

}

3121

3122

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

3123

if(tempdir != NULL){

3124

clean_dir_at(-1, tempdir, 0);

2489

direntry = direntries[i];

2490

char *fullname = NULL;

2491

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

2492

direntry->d_name);

2493

if(ret < 0){

2494

perror_plus("asprintf");

2495

continue;

2496

}

2497

ret = remove(fullname);

2498

if(ret == -1){

2499

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

2500

strerror(errno));

2501

}

2502

free(fullname);

2503

}

2504

}

2505

2506

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

2507

free(direntries);

2508

if (numentries == -1){

2509

perror_plus("scandir");

2510

}

2511

ret = rmdir(tempdir);

2512

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

2513

perror_plus("rmdir");

2514

}

3125

2515

}

3126

2516

3127

2517

if(quit_now){