/mandos/trunk : revision 237.4.99

9

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

10

*

11

* Everything else is

12

13

14

*

15

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

16

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

17

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

18

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

19

*

20

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

12

13

14

*

15

* This file is part of Mandos.

16

*

17

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

18

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

19

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

20

* (at your option) any later version.

21

*

22

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

21

23

* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

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

23

25

* General Public License for more details.

24

26

*

25

27

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

26

* along with this program. If not, see

27

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

28

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

28

29

*

29

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

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

44

stdout, ferror() */

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 <assert.h> /* assert() */

65

#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,

66

72

program_invocation_short_name */

67

73

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

68

74

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

73

79

*/

74

80

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

75

81

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

76

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

77

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

82

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

83

unlinkat() */

84

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

78

85

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

79

86

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

80

87

argp_state, struct argp,

88

95

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

89

96

WEXITSTATUS(), WTERMSIG() */

90

97

#include <grp.h> /* setgroups() */

98

#include <argz.h> /* argz_add_sep(), argz_next(),

99

argz_delete(), argz_append(),

100

argz_stringify(), argz_add(),

101

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

91

104

92

105

#ifdef __linux__

93

106

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

135

148

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

136

149

char *connect_to = NULL;

137

150

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

152

uid_t uid = 65534;

153

gid_t gid = 65534;

138

154

139

155

/* Doubly linked list that need to be circularly linked when used */

140

156

typedef struct server{

141

157

const char *ip;

142

uint16_t port;

158

in_port_t port;

143

159

AvahiIfIndex if_index;

144

160

int af;

145

161

struct timespec last_seen;

149

165

150

166

/* Used for passing in values through the Avahi callback functions */

151

167

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

168

AvahiServer *server;

154

169

gnutls_certificate_credentials_t cred;

155

170

unsigned int dh_bits;

157

172

const char *priority;

158

173

gpgme_ctx_t ctx;

159

174

server *current_server;

175

char *interfaces;

176

size_t interfaces_size;

160

177

} mandos_context;

161

178

162

/* global context so signal handler can reach it*/

163

mandos_context mc = { .simple_poll = NULL, .server = NULL,

164

.dh_bits = 1024, .priority = "SECURE256"

165

":!CTYPE-X.509:+CTYPE-OPENPGP",

166

.current_server = NULL };

179

/* global so signal handler can reach it*/

180

AvahiSimplePoll *simple_poll;

167

181

168

182

sig_atomic_t quit_now = 0;

169

183

int signal_received = 0;

177

191

perror(print_text);

178

192

}

179

193

180

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

194

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

181

195

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

182

196

va_list ap;

183

197

va_start (ap, format);

184

198

185

199

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

186

200

program_invocation_short_name));

187

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

201

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

188

202

}

189

203

190

204

/*

192

206

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

193

207

* "buffer_length" is how much is already used.

194

208

*/

209

__attribute__((nonnull, warn_unused_result))

195

210

size_t incbuffer(char **buffer, size_t buffer_length,

196

211

size_t buffer_capacity){

197

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

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

199

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;

200

219

return 0;

201

220

}

221

*buffer = new_buf;

202

222

buffer_capacity += BUFFER_SIZE;

203

223

}

204

224

return buffer_capacity;

205

225

}

206

226

207

227

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

208

bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

209

int af){

228

__attribute__((nonnull, warn_unused_result))

229

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

230

int af, server **current_server){

210

231

int ret;

211

232

server *new_server = malloc(sizeof(server));

212

233

if(new_server == NULL){

219

240

.af = af };

220

241

if(new_server->ip == NULL){

221

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);

222

258

return false;

223

259

}

224

260

/* Special case of first server */

225

if (mc.current_server == NULL){

261

if(*current_server == NULL){

226

262

new_server->next = new_server;

227

263

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

264

*current_server = new_server;

230

265

} else {

231

new_server->next = mc.current_server;

232

new_server->prev = mc.current_server->prev;

266

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

267

new_server->next = *current_server;

268

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

233

269

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

270

(*current_server)->prev = new_server;

240

271

}

241

272

return true;

242

273

}

243

274

275

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

276

__attribute__((warn_unused_result))

277

int raise_privileges(void){

278

int old_errno = errno;

279

int ret = 0;

280

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

281

ret = errno;

282

}

283

errno = old_errno;

284

return ret;

285

}

286

287

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

288

__attribute__((warn_unused_result))

289

int raise_privileges_permanently(void){

290

int old_errno = errno;

291

int ret = raise_privileges();

292

if(ret != 0){

293

errno = old_errno;

294

return ret;

295

}

296

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

297

ret = errno;

298

}

299

errno = old_errno;

300

return ret;

301

}

302

303

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

304

__attribute__((warn_unused_result))

305

int lower_privileges(void){

306

int old_errno = errno;

307

int ret = 0;

308

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

309

ret = errno;

310

}

311

errno = old_errno;

312

return ret;

313

}

314

315

/* Lower privileges permanently */

316

__attribute__((warn_unused_result))

317

int lower_privileges_permanently(void){

318

int old_errno = errno;

319

int ret = 0;

320

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

321

ret = errno;

322

}

323

errno = old_errno;

324

return ret;

325

}

326

244

327

/*

245

328

* Initialize GPGME.

246

329

*/

247

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

248

const char *tempdir){

330

__attribute__((nonnull, warn_unused_result))

331

static bool init_gpgme(const char * const seckey,

332

const char * const pubkey,

333

const char * const tempdir,

334

mandos_context *mc){

249

335

gpgme_error_t rc;

250

336

gpgme_engine_info_t engine_info;

251

337

252

253

338

/*

254

339

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

255

340

*/

256

bool import_key(const char *filename){

341

bool import_key(const char * const filename){

257

342

int ret;

258

343

int fd;

259

344

gpgme_data_t pgp_data;

264

349

return false;

265

350

}

266

351

352

/* Workaround for systems without a real-time clock; see also

353

Debian bug #894495: <https://bugs.debian.org/894495> */

354

do {

355

{

356

time_t currtime = time(NULL);

357

if(currtime != (time_t)-1){

358

struct tm tm;

359

if(gmtime_r(&currtime, &tm) == NULL) {

360

perror_plus("gmtime_r");

361

break;

362

}

363

if(tm.tm_year != 70 or tm.tm_mon != 0){

364

break;

365

}

366

if(debug){

367

fprintf_plus(stderr, "System clock is January 1970");

368

}

369

} else {

370

if(debug){

371

fprintf_plus(stderr, "System clock is invalid");

372

}

373

}

374

}

375

struct stat keystat;

376

ret = fstat(fd, &keystat);

377

if(ret != 0){

378

perror_plus("fstat");

379

break;

380

}

381

ret = raise_privileges();

382

if(ret != 0){

383

errno = ret;

384

perror_plus("Failed to raise privileges");

385

break;

386

}

387

if(debug){

388

fprintf_plus(stderr,

389

"Setting system clock to key file mtime");

390

}

391

time_t keytime = keystat.st_mtim.tv_sec;

392

if(stime(&keytime) != 0){

393

perror_plus("stime");

394

}

395

ret = lower_privileges();

396

if(ret != 0){

397

errno = ret;

398

perror_plus("Failed to lower privileges");

399

}

400

} while(false);

401

267

402

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

403

if(rc != GPG_ERR_NO_ERROR){

269

404

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

271

406

return false;

272

407

}

273

408

274

rc = gpgme_op_import(mc.ctx, pgp_data);

409

rc = gpgme_op_import(mc->ctx, pgp_data);

275

410

if(rc != GPG_ERR_NO_ERROR){

276

411

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

277

412

gpgme_strsource(rc), gpgme_strerror(rc));

278

413

return false;

279

414

}

415

{

416

gpgme_import_result_t import_result

417

= gpgme_op_import_result(mc->ctx);

418

if((import_result->imported < 1

419

or import_result->not_imported > 0)

420

and import_result->unchanged == 0){

421

fprintf_plus(stderr, "bad gpgme_op_import_results:\n");

422

fprintf_plus(stderr,

423

"The total number of considered keys: %d\n",

424

import_result->considered);

425

fprintf_plus(stderr,

426

"The number of keys without user ID: %d\n",

427

import_result->no_user_id);

428

fprintf_plus(stderr,

429

"The total number of imported keys: %d\n",

430

import_result->imported);

431

fprintf_plus(stderr, "The number of imported RSA keys: %d\n",

432

import_result->imported_rsa);

433

fprintf_plus(stderr, "The number of unchanged keys: %d\n",

434

import_result->unchanged);

435

fprintf_plus(stderr, "The number of new user IDs: %d\n",

436

import_result->new_user_ids);

437

fprintf_plus(stderr, "The number of new sub keys: %d\n",

438

import_result->new_sub_keys);

439

fprintf_plus(stderr, "The number of new signatures: %d\n",

440

import_result->new_signatures);

441

fprintf_plus(stderr, "The number of new revocations: %d\n",

442

import_result->new_revocations);

443

fprintf_plus(stderr,

444

"The total number of secret keys read: %d\n",

445

import_result->secret_read);

446

fprintf_plus(stderr,

447

"The number of imported secret keys: %d\n",

448

import_result->secret_imported);

449

fprintf_plus(stderr,

450

"The number of unchanged secret keys: %d\n",

451

import_result->secret_unchanged);

452

fprintf_plus(stderr, "The number of keys not imported: %d\n",

453

import_result->not_imported);

454

for(gpgme_import_status_t import_status

455

= import_result->imports;

456

import_status != NULL;

457

import_status = import_status->next){

458

fprintf_plus(stderr, "Import status for key: %s\n",

459

import_status->fpr);

460

if(import_status->result != GPG_ERR_NO_ERROR){

461

fprintf_plus(stderr, "Import result: %s: %s\n",

462

gpgme_strsource(import_status->result),

463

gpgme_strerror(import_status->result));

464

}

465

fprintf_plus(stderr, "Key status:\n");

466

fprintf_plus(stderr,

467

import_status->status & GPGME_IMPORT_NEW

468

? "The key was new.\n"

469

: "The key was not new.\n");

470

fprintf_plus(stderr,

471

import_status->status & GPGME_IMPORT_UID

472

? "The key contained new user IDs.\n"

473

: "The key did not contain new user IDs.\n");

474

fprintf_plus(stderr,

475

import_status->status & GPGME_IMPORT_SIG

476

? "The key contained new signatures.\n"

477

: "The key did not contain new signatures.\n");

478

fprintf_plus(stderr,

479

import_status->status & GPGME_IMPORT_SUBKEY

480

? "The key contained new sub keys.\n"

481

: "The key did not contain new sub keys.\n");

482

fprintf_plus(stderr,

483

import_status->status & GPGME_IMPORT_SECRET

484

? "The key contained a secret key.\n"

485

: "The key did not contain a secret key.\n");

486

}

487

return false;

488

}

489

}

280

490

281

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

491

ret = close(fd);

282

492

if(ret == -1){

283

493

perror_plus("close");

284

494

}

321

531

}

322

532

323

533

/* Create new GPGME "context" */

324

rc = gpgme_new(&(mc.ctx));

534

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

325

535

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

536

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

537

gpgme_strsource(rc), gpgme_strerror(rc));

329

538

return false;

330

539

}

331

540

340

549

* Decrypt OpenPGP data.

341

550

* Returns -1 on error

342

551

*/

552

__attribute__((nonnull, warn_unused_result))

343

553

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

554

size_t crypto_size,

345

char **plaintext){

555

char **plaintext,

556

mandos_context *mc){

346

557

gpgme_data_t dh_crypto, dh_plain;

347

558

gpgme_error_t rc;

348

559

ssize_t ret;

365

576

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

366

577

rc = gpgme_data_new(&dh_plain);

367

578

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

579

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

370

580

gpgme_strsource(rc), gpgme_strerror(rc));

371

581

gpgme_data_release(dh_crypto);

372

582

return -1;

374

584

375

585

/* Decrypt data from the cryptotext data buffer to the plaintext

376

586

data buffer */

377

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

587

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

378

588

if(rc != GPG_ERR_NO_ERROR){

379

589

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

380

590

gpgme_strsource(rc), gpgme_strerror(rc));

381

591

plaintext_length = -1;

382

592

if(debug){

383

593

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

594

result = gpgme_op_decrypt_result(mc->ctx);

385

595

if(result == NULL){

386

596

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

387

597

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

598

if(result->unsupported_algorithm != NULL) {

599

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

600

result->unsupported_algorithm);

601

}

602

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

603

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

392

604

if(result->file_name != NULL){

393

605

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

394

606

}

395

gpgme_recipient_t recipient;

396

recipient = result->recipients;

397

while(recipient != NULL){

607

608

for(gpgme_recipient_t r = result->recipients; r != NULL;

609

r = r->next){

398

610

fprintf_plus(stderr, "Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);

611

gpgme_pubkey_algo_name(r->pubkey_algo));

612

fprintf_plus(stderr, "Key ID: %s\n", r->keyid);

402

613

fprintf_plus(stderr, "Secret key available: %s\n",

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

405

recipient = recipient->next;

614

r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");

406

615

}

407

616

}

408

617

}

464

673

return plaintext_length;

465

674

}

466

675

467

static const char * safer_gnutls_strerror(int value){

468

const char *ret = gnutls_strerror(value); /* Spurious warning from

469

-Wunreachable-code */

470

if(ret == NULL)

471

ret = "(unknown)";

472

return ret;

676

__attribute__((warn_unused_result, const))

677

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

678

if(str == NULL)

679

return "(unknown)";

680

return str;

681

}

682

683

__attribute__((warn_unused_result))

684

static const char *safer_gnutls_strerror(int value){

685

const char *ret = gnutls_strerror(value);

686

return safe_string(ret);

473

687

}

474

688

475

689

/* GnuTLS log function callback */

690

__attribute__((nonnull))

476

691

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

477

692

const char* string){

478

693

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

479

694

}

480

695

696

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

481

697

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

698

const char *seckeyfilename,

699

const char *dhparamsfilename,

700

mandos_context *mc){

483

701

int ret;

702

unsigned int uret;

484

703

485

704

if(debug){

486

705

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

487

706

}

488

707

489

ret = gnutls_global_init();

490

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

493

return -1;

494

}

495

496

708

if(debug){

497

709

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

498

710

* - GnuTLS manual

502

714

}

503

715

504

716

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

717

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

718

if(ret != GNUTLS_E_SUCCESS){

507

719

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

508

720

safer_gnutls_strerror(ret));

509

gnutls_global_deinit();

510

721

return -1;

511

722

}

512

723

518

729

}

519

730

520

731

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

732

(mc->cred, pubkeyfilename, seckeyfilename,

522

733

GNUTLS_OPENPGP_FMT_BASE64);

523

734

if(ret != GNUTLS_E_SUCCESS){

524

735

fprintf_plus(stderr,

530

741

}

531

742

532

743

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

744

ret = gnutls_dh_params_init(&mc->dh_params);

534

745

if(ret != GNUTLS_E_SUCCESS){

535

746

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

747

" initialization: %s\n",

537

748

safer_gnutls_strerror(ret));

538

749

goto globalfail;

539

750

}

540

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

541

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

544

goto globalfail;

545

}

546

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

751

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

752

if(dhparamsfilename != NULL){

753

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

754

do {

755

int dhpfile = open(dhparamsfilename, O_RDONLY);

756

if(dhpfile == -1){

757

perror_plus("open");

758

dhparamsfilename = NULL;

759

break;

760

}

761

size_t params_capacity = 0;

762

while(true){

763

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

764

(size_t)params.size,

765

(size_t)params_capacity);

766

if(params_capacity == 0){

767

perror_plus("incbuffer");

768

free(params.data);

769

params.data = NULL;

770

dhparamsfilename = NULL;

771

break;

772

}

773

ssize_t bytes_read = read(dhpfile,

774

params.data + params.size,

775

BUFFER_SIZE);

776

/* EOF */

777

if(bytes_read == 0){

778

break;

779

}

780

/* check bytes_read for failure */

781

if(bytes_read < 0){

782

perror_plus("read");

783

free(params.data);

784

params.data = NULL;

785

dhparamsfilename = NULL;

786

break;

787

}

788

params.size += (unsigned int)bytes_read;

789

}

790

ret = close(dhpfile);

791

if(ret == -1){

792

perror_plus("close");

793

}

794

if(params.data == NULL){

795

dhparamsfilename = NULL;

796

}

797

if(dhparamsfilename == NULL){

798

break;

799

}

800

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

801

GNUTLS_X509_FMT_PEM);

802

if(ret != GNUTLS_E_SUCCESS){

803

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

804

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

805

safer_gnutls_strerror(ret));

806

dhparamsfilename = NULL;

807

}

808

free(params.data);

809

} while(false);

810

}

811

if(dhparamsfilename == NULL){

812

if(mc->dh_bits == 0){

813

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

814

/* Try to read the private key file */

815

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

816

do {

817

int secfile = open(seckeyfilename, O_RDONLY);

818

if(secfile == -1){

819

perror_plus("open");

820

break;

821

}

822

size_t buffer_capacity = 0;

823

while(true){

824

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

825

(size_t)buffer.size,

826

(size_t)buffer_capacity);

827

if(buffer_capacity == 0){

828

perror_plus("incbuffer");

829

free(buffer.data);

830

buffer.data = NULL;

831

break;

832

}

833

ssize_t bytes_read = read(secfile,

834

buffer.data + buffer.size,

835

BUFFER_SIZE);

836

/* EOF */

837

if(bytes_read == 0){

838

break;

839

}

840

/* check bytes_read for failure */

841

if(bytes_read < 0){

842

perror_plus("read");

843

free(buffer.data);

844

buffer.data = NULL;

845

break;

846

}

847

buffer.size += (unsigned int)bytes_read;

848

}

849

close(secfile);

850

} while(false);

851

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

852

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

853

if(buffer.data != NULL){

854

{

855

gnutls_openpgp_privkey_t privkey = NULL;

856

ret = gnutls_openpgp_privkey_init(&privkey);

857

if(ret != GNUTLS_E_SUCCESS){

858

fprintf_plus(stderr, "Error initializing OpenPGP key"

859

" structure: %s",

860

safer_gnutls_strerror(ret));

861

free(buffer.data);

862

buffer.data = NULL;

863

} else {

864

ret = gnutls_openpgp_privkey_import

865

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

866

if(ret != GNUTLS_E_SUCCESS){

867

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

868

safer_gnutls_strerror(ret));

869

privkey = NULL;

870

}

871

free(buffer.data);

872

buffer.data = NULL;

873

if(privkey != NULL){

874

/* Use private key to suggest an appropriate

875

sec_param */

876

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

877

gnutls_openpgp_privkey_deinit(privkey);

878

if(debug){

879

fprintf_plus(stderr, "This OpenPGP key implies using"

880

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

881

safe_string(gnutls_sec_param_get_name

882

(sec_param)));

883

}

884

}

885

}

886

}

887

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

888

/* Err on the side of caution */

889

sec_param = GNUTLS_SEC_PARAM_ULTRA;

890

if(debug){

891

fprintf_plus(stderr, "Falling back to security parameter"

892

" \"%s\"\n",

893

safe_string(gnutls_sec_param_get_name

894

(sec_param)));

895

}

896

}

897

}

898

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

899

if(uret != 0){

900

mc->dh_bits = uret;

901

if(debug){

902

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

903

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

904

safe_string(gnutls_sec_param_get_name

905

(sec_param)),

906

mc->dh_bits);

907

}

908

} else {

909

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

910

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

911

safe_string(gnutls_sec_param_get_name

912

(sec_param)),

913

safer_gnutls_strerror(ret));

914

goto globalfail;

915

}

916

} else if(debug){

917

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

918

mc->dh_bits);

919

}

920

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

921

if(ret != GNUTLS_E_SUCCESS){

922

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

923

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

924

safer_gnutls_strerror(ret));

925

goto globalfail;

926

}

927

}

928

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

548

929

549

930

return 0;

550

931

551

932

globalfail:

552

933

553

gnutls_certificate_free_credentials(mc.cred);

554

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

934

gnutls_certificate_free_credentials(mc->cred);

935

gnutls_dh_params_deinit(mc->dh_params);

556

936

return -1;

557

937

}

558

938

559

static int init_gnutls_session(gnutls_session_t *session){

939

__attribute__((nonnull, warn_unused_result))

940

static int init_gnutls_session(gnutls_session_t *session,

941

mandos_context *mc){

560

942

int ret;

561

943

/* GnuTLS session creation */

562

944

do {

574

956

{

575

957

const char *err;

576

958

do {

577

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

959

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

578

960

if(quit_now){

579

961

gnutls_deinit(*session);

580

962

return -1;

591

973

592

974

do {

593

975

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

976

mc->cred);

595

977

if(quit_now){

596

978

gnutls_deinit(*session);

597

979

return -1;

607

989

/* ignore client certificate if any. */

608

990

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

991

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

611

612

992

return 0;

613

993

}

614

994

616

996

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

617

997

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

618

998

999

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

1000

__attribute__((nonnull, warn_unused_result))

1001

static bool add_delete_local_route(const bool add,

1002

const char *address,

1003

AvahiIfIndex if_index){

1004

int ret;

1005

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

1006

char add_arg[] = "add";

1007

char delete_arg[] = "delete";

1008

char debug_flag[] = "--debug";

1009

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

1010

if(pluginhelperdir == NULL){

1011

if(debug){

1012

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

1013

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

1014

}

1015

return false;

1016

}

1017

1018

char interface[IF_NAMESIZE];

1019

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

1020

perror_plus("if_indextoname");

1021

return false;

1022

}

1023

1024

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

1025

if(devnull == -1){

1026

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

1027

return false;

1028

}

1029

pid_t pid = fork();

1030

if(pid == 0){

1031

/* Child */

1032

/* Raise privileges */

1033

errno = raise_privileges_permanently();

1034

if(errno != 0){

1035

perror_plus("Failed to raise privileges");

1036

/* _exit(EX_NOPERM); */

1037

} else {

1038

/* Set group */

1039

errno = 0;

1040

ret = setgid(0);

1041

if(ret == -1){

1042

perror_plus("setgid");

1043

_exit(EX_NOPERM);

1044

}

1045

/* Reset supplementary groups */

1046

errno = 0;

1047

ret = setgroups(0, NULL);

1048

if(ret == -1){

1049

perror_plus("setgroups");

1050

_exit(EX_NOPERM);

1051

}

1052

}

1053

ret = dup2(devnull, STDIN_FILENO);

1054

if(ret == -1){

1055

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

1056

_exit(EX_OSERR);

1057

}

1058

ret = close(devnull);

1059

if(ret == -1){

1060

perror_plus("close");

1061

_exit(EX_OSERR);

1062

}

1063

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1064

if(ret == -1){

1065

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

1066

_exit(EX_OSERR);

1067

}

1068

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

1069

O_RDONLY

1070

| O_DIRECTORY

1071

| O_PATH

1072

| O_CLOEXEC));

1073

if(helperdir_fd == -1){

1074

perror_plus("open");

1075

_exit(EX_UNAVAILABLE);

1076

}

1077

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

1078

helper, O_RDONLY));

1079

if(helper_fd == -1){

1080

perror_plus("openat");

1081

close(helperdir_fd);

1082

_exit(EX_UNAVAILABLE);

1083

}

1084

close(helperdir_fd);

1085

#ifdef __GNUC__

1086

#pragma GCC diagnostic push

1087

#pragma GCC diagnostic ignored "-Wcast-qual"

1088

#endif

1089

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

1090

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

1091

interface, debug ? debug_flag : NULL, NULL },

1092

environ) == -1){

1093

#ifdef __GNUC__

1094

#pragma GCC diagnostic pop

1095

#endif

1096

perror_plus("fexecve");

1097

_exit(EXIT_FAILURE);

1098

}

1099

}

1100

if(pid == -1){

1101

perror_plus("fork");

1102

return false;

1103

}

1104

int status;

1105

pid_t pret = -1;

1106

errno = 0;

1107

do {

1108

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

1109

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

1110

int errno_raising = 0;

1111

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

1112

errno_raising = errno;

1113

perror_plus("Failed to raise privileges in order to"

1114

" kill helper program");

1115

}

1116

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

1117

perror_plus("kill");

1118

}

1119

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

1120

perror_plus("Failed to lower privileges after killing"

1121

" helper program");

1122

}

1123

return false;

1124

}

1125

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

1126

if(pret == -1){

1127

perror_plus("waitpid");

1128

return false;

1129

}

1130

if(WIFEXITED(status)){

1131

if(WEXITSTATUS(status) != 0){

1132

fprintf_plus(stderr, "Error: iprouteadddel exited"

1133

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

1134

return false;

1135

}

1136

return true;

1137

}

1138

if(WIFSIGNALED(status)){

1139

fprintf_plus(stderr, "Error: iprouteadddel died by"

1140

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

1141

return false;

1142

}

1143

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

1144

return false;

1145

}

1146

1147

__attribute__((nonnull, warn_unused_result))

1148

static bool add_local_route(const char *address,

1149

AvahiIfIndex if_index){

1150

if(debug){

1151

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

1152

}

1153

return add_delete_local_route(true, address, if_index);

1154

}

1155

1156

__attribute__((nonnull, warn_unused_result))

1157

static bool delete_local_route(const char *address,

1158

AvahiIfIndex if_index){

1159

if(debug){

1160

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

1161

}

1162

return add_delete_local_route(false, address, if_index);

1163

}

1164

619

1165

/* Called when a Mandos server is found */

620

static int start_mandos_communication(const char *ip, uint16_t port,

1166

__attribute__((nonnull, warn_unused_result))

1167

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

621

1168

AvahiIfIndex if_index,

622

int af){

1169

int af, mandos_context *mc){

623

1170

int ret, tcp_sd = -1;

624

1171

ssize_t sret;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

1172

struct sockaddr_storage to;

629

1173

char *buffer = NULL;

630

1174

char *decrypted_buffer = NULL;

631

1175

size_t buffer_length = 0;

634

1178

int retval = -1;

635

1179

gnutls_session_t session;

636

1180

int pf; /* Protocol family */

1181

bool route_added = false;

637

1182

638

1183

errno = 0;

639

1184

655

1200

return -1;

656

1201

}

657

1202

658

ret = init_gnutls_session(&session);

1203

/* If the interface is specified and we have a list of interfaces */

1204

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

1205

/* Check if the interface is one of the interfaces we are using */

1206

bool match = false;

1207

{

1208

char *interface = NULL;

1209

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

1210

mc->interfaces_size,

1211

interface))){

1212

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

1213

match = true;

1214

break;

1215

}

1216

}

1217

}

1218

if(not match){

1219

/* This interface does not match any in the list, so we don't

1220

connect to the server */

1221

if(debug){

1222

char interface[IF_NAMESIZE];

1223

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

1224

perror_plus("if_indextoname");

1225

} else {

1226

fprintf_plus(stderr, "Skipping server on non-used interface"

1227

" \"%s\"\n",

1228

if_indextoname((unsigned int)if_index,

1229

interface));

1230

}

1231

}

1232

return -1;

1233

}

1234

}

1235

1236

ret = init_gnutls_session(&session, mc);

659

1237

if(ret != 0){

660

1238

return -1;

661

1239

}

662

1240

663

1241

if(debug){

664

1242

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

665

PRIu16 "\n", ip, port);

1243

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

666

1244

}

667

1245

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

1246

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

669

1247

if(tcp_sd < 0){

670

1248

int e = errno;

671

1249

perror_plus("socket");

678

1256

goto mandos_end;

679

1257

}

680

1258

681

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

682

1259

if(af == AF_INET6){

683

to.in6.sin6_family = (sa_family_t)af;

684

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

1260

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

1261

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

1262

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

685

1263

} else { /* IPv4 */

686

to.in.sin_family = (sa_family_t)af;

687

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

1264

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

1265

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

1266

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

688

1267

}

689

1268

if(ret < 0 ){

690

1269

int e = errno;

699

1278

goto mandos_end;

700

1279

}

701

1280

if(af == AF_INET6){

702

to.in6.sin6_port = htons(port); /* Spurious warnings from

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

1281

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

1282

if(IN6_IS_ADDR_LINKLOCAL

1283

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

709

1284

if(if_index == AVAHI_IF_UNSPEC){

710

1285

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

711

1286

" incomplete without a network interface\n");

713

1288

goto mandos_end;

714

1289

}

715

1290

/* Set the network interface number as scope */

716

to.in6.sin6_scope_id = (uint32_t)if_index;

1291

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

717

1292

}

718

1293

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

1294

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

722

1295

}

723

1296

724

1297

if(quit_now){

732

1305

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

733

1306

perror_plus("if_indextoname");

734

1307

} else {

735

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

736

"\n", ip, interface, port);

1308

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

1309

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

737

1310

}

738

1311

} else {

739

fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",

740

ip, port);

1312

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

1313

ip, (uintmax_t)port);

741

1314

}

742

1315

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

1316

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

745

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

748

} else {

749

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

750

sizeof(addrstr));

751

}

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

758

}

759

}

760

761

if(quit_now){

762

errno = EINTR;

763

goto mandos_end;

764

}

765

766

if(af == AF_INET6){

767

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

768

} else {

769

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

770

}

771

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

777

goto mandos_end;

778

}

779

780

if(quit_now){

781

errno = EINTR;

782

goto mandos_end;

1317

if(af == AF_INET6){

1318

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

1319

sizeof(struct sockaddr_in6),

1320

addrstr, sizeof(addrstr), NULL, 0,

1321

NI_NUMERICHOST);

1322

} else {

1323

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

1324

sizeof(struct sockaddr_in),

1325

addrstr, sizeof(addrstr), NULL, 0,

1326

NI_NUMERICHOST);

1327

}

1328

if(ret == EAI_SYSTEM){

1329

perror_plus("getnameinfo");

1330

} else if(ret != 0) {

1331

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

1332

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

1333

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

1334

}

1335

}

1336

1337

if(quit_now){

1338

errno = EINTR;

1339

goto mandos_end;

1340

}

1341

1342

while(true){

1343

if(af == AF_INET6){

1344

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

1345

sizeof(struct sockaddr_in6));

1346

} else {

1347

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

1348

sizeof(struct sockaddr_in));

1349

}

1350

if(ret < 0){

1351

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

1352

and if_index != AVAHI_IF_UNSPEC

1353

and connect_to == NULL

1354

and not route_added and

1355

((af == AF_INET6 and not

1356

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1357

&to)->sin6_addr)))

1358

or (af == AF_INET and

1359

/* Not a a IPv4LL address */

1360

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

1361

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

1362

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

1363

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

1364

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

1365

connect to a Mandos server announced by Avahi on a server

1366

host with a global address. Work around this by retrying

1367

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

1368

1369

Avahi bug reference:

1370

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

1371

https://bugs.debian.org/587961

1372

*/

1373

if(debug){

1374

fprintf_plus(stderr, "Mandos server unreachable, trying"

1375

" direct route\n");

1376

}

1377

int e = errno;

1378

route_added = add_local_route(ip, if_index);

1379

if(route_added){

1380

continue;

1381

}

1382

errno = e;

1383

}

1384

if(errno != ECONNREFUSED or debug){

1385

int e = errno;

1386

perror_plus("connect");

1387

errno = e;

1388

}

1389

goto mandos_end;

1390

}

1391

1392

if(quit_now){

1393

errno = EINTR;

1394

goto mandos_end;

1395

}

1396

break;

783

1397

}

784

1398

785

1399

const char *out = mandos_protocol_version;

821

1435

goto mandos_end;

822

1436

}

823

1437

824

/* Spurious warning from -Wint-to-pointer-cast */

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1438

/* This casting via intptr_t is to eliminate warning about casting

1439

an int to a pointer type. This is exactly how the GnuTLS Guile

1440

function "set-session-transport-fd!" does it. */

1441

gnutls_transport_set_ptr(session,

1442

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

826

1443

827

1444

if(quit_now){

828

1445

errno = EINTR;

933

1550

if(buffer_length > 0){

934

1551

ssize_t decrypted_buffer_size;

935

1552

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

1553

&decrypted_buffer, mc);

937

1554

if(decrypted_buffer_size >= 0){

938

1555

1556

clearerr(stdout);

939

1557

written = 0;

940

1558

while(written < (size_t) decrypted_buffer_size){

941

1559

if(quit_now){

957

1575

}

958

1576

written += (size_t)ret;

959

1577

}

1578

ret = fflush(stdout);

1579

if(ret != 0){

1580

int e = errno;

1581

if(debug){

1582

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

1583

strerror(errno));

1584

}

1585

errno = e;

1586

goto mandos_end;

1587

}

960

1588

retval = 0;

961

1589

}

962

1590

}

965

1593

966

1594

mandos_end:

967

1595

{

1596

if(route_added){

1597

if(not delete_local_route(ip, if_index)){

1598

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

1599

" interface %d", ip, if_index);

1600

}

1601

}

968

1602

int e = errno;

969

1603

free(decrypted_buffer);

970

1604

free(buffer);

971

1605

if(tcp_sd >= 0){

972

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

1606

ret = close(tcp_sd);

973

1607

}

974

1608

if(ret == -1){

975

1609

if(e == 0){

1000

1634

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1635

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1636

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1637

void *mc){

1638

if(r == NULL){

1639

return;

1640

}

1005

1641

1006

1642

/* Called whenever a service has been resolved successfully or

1007

1643

timed out */

1008

1644

1009

1645

if(quit_now){

1646

avahi_s_service_resolver_free(r);

1010

1647

return;

1011

1648

}

1012

1649

1016

1653

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1017

1654

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1018

1655

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1656

avahi_strerror(avahi_server_errno

1657

(((mandos_context*)mc)->server)));

1020

1658

break;

1021

1659

1022

1660

case AVAHI_RESOLVER_FOUND:

1028

1666

PRIdMAX ") on port %" PRIu16 "\n", name,

1029

1667

host_name, ip, (intmax_t)interface, port);

1030

1668

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1669

int ret = start_mandos_communication(ip, (in_port_t)port,

1670

interface,

1671

avahi_proto_to_af(proto),

1672

mc);

1033

1673

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1674

avahi_simple_poll_quit(simple_poll);

1035

1675

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1676

if(not add_server(ip, (in_port_t)port, interface,

1677

avahi_proto_to_af(proto),

1678

&((mandos_context*)mc)->current_server)){

1038

1679

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1039

1680

" list\n", name);

1040

1681

}

1053

1694

const char *domain,

1054

1695

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1696

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1697

void *mc){

1698

if(b == NULL){

1699

return;

1700

}

1058

1701

1059

1702

/* Called whenever a new services becomes available on the LAN or

1060

1703

is removed from the LAN */

1068

1711

case AVAHI_BROWSER_FAILURE:

1069

1712

1070

1713

fprintf_plus(stderr, "(Avahi browser) %s\n",

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1714

avahi_strerror(avahi_server_errno

1715

(((mandos_context*)mc)->server)));

1716

avahi_simple_poll_quit(simple_poll);

1073

1717

return;

1074

1718

1075

1719

case AVAHI_BROWSER_NEW:

1078

1722

the callback function is called the Avahi server will free the

1079

1723

resolver for us. */

1080

1724

1081

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1725

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1726

interface, protocol, name, type,

1727

domain, protocol, 0,

1728

resolve_callback, mc) == NULL)

1084

1729

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1085

1730

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1731

avahi_strerror(avahi_server_errno

1732

(((mandos_context*)mc)->server)));

1087

1733

break;

1088

1734

1089

1735

case AVAHI_BROWSER_REMOVE:

1108

1754

signal_received = sig;

1109

1755

int old_errno = errno;

1110

1756

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1757

if(simple_poll != NULL){

1758

avahi_simple_poll_quit(simple_poll);

1113

1759

}

1114

1760

errno = old_errno;

1115

1761

}

1116

1762

1763

__attribute__((nonnull, warn_unused_result))

1117

1764

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

1118

1765

int ret;

1766

int old_errno;

1119

1767

1120

1768

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

1121

1769

if(s < 0){

1770

old_errno = errno;

1122

1771

perror_plus("socket");

1772

errno = old_errno;

1123

1773

return false;

1124

1774

}

1125

strcpy(ifr->ifr_name, ifname);

1775

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

1776

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

1126

1777

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1778

if(ret == -1){

1128

1779

if(debug){

1780

old_errno = errno;

1129

1781

perror_plus("ioctl SIOCGIFFLAGS");

1782

errno = old_errno;

1783

}

1784

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

1785

old_errno = errno;

1786

perror_plus("close");

1787

errno = old_errno;

1130

1788

}

1131

1789

return false;

1132

1790

}

1791

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

1792

old_errno = errno;

1793

perror_plus("close");

1794

errno = old_errno;

1795

}

1133

1796

return true;

1134

1797

}

1135

1798

1799

__attribute__((nonnull, warn_unused_result))

1136

1800

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

1137

1801

1138

1802

/* Reject the loopback device */

1180

1844

* corresponds to an acceptable network device.

1181

1845

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

1182

1846

*/

1847

__attribute__((nonnull, warn_unused_result))

1183

1848

int good_interface(const struct dirent *if_entry){

1184

1849

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

1185

1850

return 0;

1201

1866

}

1202

1867

1203

1868

/*

1204

* This function determines if a directory entry in /sys/class/net

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

if(not get_flags(if_entry->d_name, &ifr)){

1215

if(debug){

1216

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

1217

"\"%s\"\n", if_entry->d_name);

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

if(not (ifr.ifr_flags & IFF_UP)){

1224

if(debug){

1225

fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

if(not (ifr.ifr_flags & IFF_RUNNING)){

1233

if(debug){

1234

fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

if(not good_flags(if_entry->d_name, &ifr)){

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1869

* This function determines if a network interface is up.

1870

*/

1871

__attribute__((nonnull, warn_unused_result))

1872

bool interface_is_up(const char *interface){

1873

struct ifreq ifr;

1874

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

1875

if(debug){

1876

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

1877

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

1878

}

1879

return false;

1880

}

1881

1882

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

1883

}

1884

1885

/*

1886

* This function determines if a network interface is running

1887

*/

1888

__attribute__((nonnull, warn_unused_result))

1889

bool interface_is_running(const char *interface){

1890

struct ifreq ifr;

1891

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

1892

if(debug){

1893

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

1894

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

1895

}

1896

return false;

1897

}

1898

1899

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

1900

}

1901

1902

__attribute__((nonnull, pure, warn_unused_result))

1246

1903

int notdotentries(const struct dirent *direntry){

1247

1904

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

1248

1905

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

1255

1912

}

1256

1913

1257

1914

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

1915

__attribute__((nonnull, warn_unused_result))

1258

1916

int runnable_hook(const struct dirent *direntry){

1259

1917

int ret;

1260

1918

size_t sret;

1268

1926

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

1269

1927

"abcdefghijklmnopqrstuvwxyz"

1270

1928

"0123456789"

1271

"_-");

1929

"_.-");

1272

1930

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

1273

1931

/* Contains non-allowed characters */

1274

1932

if(debug){

1278

1936

return 0;

1279

1937

}

1280

1938

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1939

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

1289

1940

if(ret == -1){

1290

1941

if(debug){

1291

1942

perror_plus("Could not stat hook");

1315

1966

return 1;

1316

1967

}

1317

1968

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1969

__attribute__((nonnull, warn_unused_result))

1970

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1971

mandos_context *mc){

1319

1972

int ret;

1320

1973

struct timespec now;

1321

1974

struct timespec waited_time;

1322

1975

intmax_t block_time;

1323

1976

1324

1977

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1978

if(mc->current_server == NULL){

1979

if(debug){

1327

1980

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

1328

1981

" No timeout!\n");

1329

1982

}

1330

1983

ret = avahi_simple_poll_iterate(s, -1);

1331

1984

} else {

1332

if (debug){

1985

if(debug){

1333

1986

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

1334

1987

" it, or wait\n");

1335

1988

}

1342

1995

/* Calculating in ms how long time between now and server

1343

1996

who we visted longest time ago. Now - last seen. */

1344

1997

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1998

- mc->current_server->last_seen.tv_sec);

1346

1999

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

2000

- mc->current_server->last_seen.tv_nsec);

1348

2001

/* total time is 10s/10,000ms.

1349

2002

Converting to s from ms by dividing by 1,000,

1350

2003

and ns to ms by dividing by 1,000,000. */

1352

2005

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

1353

2006

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

1354

2007

1355

if (debug){

2008

if(debug){

1356

2009

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

1357

2010

block_time);

1358

2011

}

1359

2012

1360

2013

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

2014

ret = start_mandos_communication(mc->current_server->ip,

2015

mc->current_server->port,

2016

mc->current_server->if_index,

2017

mc->current_server->af, mc);

1365

2018

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

2019

avahi_simple_poll_quit(s);

1367

2020

return 0;

1368

2021

}

1369

2022

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

2023

&mc->current_server->last_seen);

1371

2024

if(ret == -1){

1372

2025

perror_plus("clock_gettime");

1373

2026

return -1;

1374

2027

}

1375

mc.current_server = mc.current_server->next;

2028

mc->current_server = mc->current_server->next;

1376

2029

block_time = 0; /* Call avahi to find new Mandos

1377

2030

servers, but don't block */

1378

2031

}

1380

2033

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

1381

2034

}

1382

2035

if(ret != 0){

1383

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

2036

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

1384

2037

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

1385

2038

}

1386

2039

}

1387

2040

}

1388

2041

}

1389

2042

1390

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

2043

__attribute__((nonnull))

2044

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

1391

2045

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

2046

struct dirent **direntries = NULL;

2047

if(hookdir_fd == -1){

2048

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2049

| O_CLOEXEC);

2050

if(hookdir_fd == -1){

2051

if(errno == ENOENT){

2052

if(debug){

2053

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

2054

" found\n", hookdir);

2055

}

2056

} else {

2057

perror_plus("open");

2058

}

2059

return;

2060

}

2061

}

2062

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

2063

if(devnull == -1){

2064

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

2065

return;

2066

}

2067

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

2068

runnable_hook, alphasort);

1397

2069

if(numhooks == -1){

1398

2070

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

2071

close(devnull);

2072

return;

2073

}

2074

struct dirent *direntry;

2075

int ret;

2076

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

2077

direntry = direntries[i];

2078

if(debug){

2079

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

2080

direntry->d_name);

2081

}

2082

pid_t hook_pid = fork();

2083

if(hook_pid == 0){

2084

/* Child */

2085

/* Raise privileges */

2086

errno = raise_privileges_permanently();

2087

if(errno != 0){

2088

perror_plus("Failed to raise privileges");

2089

_exit(EX_NOPERM);

2090

}

2091

/* Set group */

2092

errno = 0;

2093

ret = setgid(0);

2094

if(ret == -1){

2095

perror_plus("setgid");

2096

_exit(EX_NOPERM);

2097

}

2098

/* Reset supplementary groups */

2099

errno = 0;

2100

ret = setgroups(0, NULL);

2101

if(ret == -1){

2102

perror_plus("setgroups");

2103

_exit(EX_NOPERM);

2104

}

2105

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

2106

if(ret == -1){

2107

perror_plus("setenv");

2108

_exit(EX_OSERR);

2109

}

2110

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

2111

if(ret == -1){

2112

perror_plus("setenv");

2113

_exit(EX_OSERR);

2114

}

2115

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

2116

if(ret == -1){

2117

perror_plus("setenv");

2118

_exit(EX_OSERR);

2119

}

2120

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

2121

if(ret == -1){

2122

perror_plus("setenv");

2123

_exit(EX_OSERR);

2124

}

2125

char *delaystring;

2126

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

2127

if(ret == -1){

1406

2128

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

2129

_exit(EX_OSERR);

2130

}

2131

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

2132

if(ret == -1){

1475

2133

free(delaystring);

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

2134

perror_plus("setenv");

2135

_exit(EX_OSERR);

2136

}

2137

free(delaystring);

2138

if(connect_to != NULL){

2139

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

2140

if(ret == -1){

2141

perror_plus("setenv");

2142

_exit(EX_OSERR);

2143

}

2144

}

2145

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

2146

direntry->d_name,

2147

O_RDONLY));

2148

if(hook_fd == -1){

2149

perror_plus("openat");

2150

_exit(EXIT_FAILURE);

2151

}

2152

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

2153

perror_plus("close");

2154

_exit(EXIT_FAILURE);

2155

}

2156

ret = dup2(devnull, STDIN_FILENO);

2157

if(ret == -1){

2158

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

2159

_exit(EX_OSERR);

2160

}

2161

ret = close(devnull);

2162

if(ret == -1){

2163

perror_plus("close");

2164

_exit(EX_OSERR);

2165

}

2166

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2167

if(ret == -1){

2168

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

2169

_exit(EX_OSERR);

2170

}

2171

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

2172

environ) == -1){

2173

perror_plus("fexecve");

2174

_exit(EXIT_FAILURE);

2175

}

2176

} else {

2177

if(hook_pid == -1){

2178

perror_plus("fork");

2179

free(direntry);

2180

continue;

2181

}

2182

int status;

2183

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

2184

perror_plus("waitpid");

2185

free(direntry);

2186

continue;

2187

}

2188

if(WIFEXITED(status)){

2189

if(WEXITSTATUS(status) != 0){

2190

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

2191

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

2192

WEXITSTATUS(status));

2193

free(direntry);

2194

continue;

2195

}

2196

} else if(WIFSIGNALED(status)){

2197

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

2198

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

2199

WTERMSIG(status));

2200

free(direntry);

2201

continue;

2202

} else {

2203

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

2204

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

2205

free(direntry);

2206

continue;

2207

}

2208

}

2209

if(debug){

2210

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

2211

direntry->d_name);

2212

}

2213

free(direntry);

2214

}

2215

free(direntries);

2216

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

2217

perror_plus("close");

2218

} else {

2219

hookdir_fd = -1;

2220

}

2221

close(devnull);

2222

}

2223

2224

__attribute__((nonnull, warn_unused_result))

2225

int bring_up_interface(const char *const interface,

2226

const float delay){

2227

int old_errno = errno;

2228

int ret;

2229

struct ifreq network;

2230

unsigned int if_index = if_nametoindex(interface);

2231

if(if_index == 0){

2232

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2233

errno = old_errno;

2234

return ENXIO;

2235

}

2236

2237

if(quit_now){

2238

errno = old_errno;

2239

return EINTR;

2240

}

2241

2242

if(not interface_is_up(interface)){

2243

int ret_errno = 0;

2244

int ioctl_errno = 0;

2245

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

2246

ret_errno = errno;

2247

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

2248

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

2249

errno = old_errno;

2250

return ret_errno;

2251

}

2252

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

2253

2254

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

2255

if(sd == -1){

2256

ret_errno = errno;

2257

perror_plus("socket");

2258

errno = old_errno;

2259

return ret_errno;

2260

}

2261

2262

if(quit_now){

2263

ret = close(sd);

2264

if(ret == -1){

2265

perror_plus("close");

2266

}

2267

errno = old_errno;

2268

return EINTR;

2269

}

2270

2271

if(debug){

2272

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

2273

interface);

2274

}

2275

2276

/* Raise privileges */

2277

ret_errno = raise_privileges();

2278

if(ret_errno != 0){

2279

errno = ret_errno;

2280

perror_plus("Failed to raise privileges");

2281

}

2282

2283

#ifdef __linux__

2284

int ret_linux;

2285

bool restore_loglevel = false;

2286

if(ret_errno == 0){

2287

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2288

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

2289

ret_linux = klogctl(8, NULL, 5);

2290

if(ret_linux == -1){

2291

perror_plus("klogctl");

2292

} else {

2293

restore_loglevel = true;

2294

}

2295

}

2296

#endif /* __linux__ */

2297

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

2298

ioctl_errno = errno;

2299

#ifdef __linux__

2300

if(restore_loglevel){

2301

ret_linux = klogctl(7, NULL, 0);

2302

if(ret_linux == -1){

2303

perror_plus("klogctl");

2304

}

2305

}

2306

#endif /* __linux__ */

2307

2308

/* If raise_privileges() succeeded above */

2309

if(ret_errno == 0){

2310

/* Lower privileges */

2311

ret_errno = lower_privileges();

2312

if(ret_errno != 0){

2313

errno = ret_errno;

2314

perror_plus("Failed to lower privileges");

2315

}

2316

}

2317

2318

/* Close the socket */

2319

ret = close(sd);

2320

if(ret == -1){

2321

perror_plus("close");

2322

}

2323

2324

if(ret_setflags == -1){

2325

errno = ioctl_errno;

2326

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2327

errno = old_errno;

2328

return ioctl_errno;

2329

}

2330

} else if(debug){

2331

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

2332

interface);

2333

}

2334

2335

/* Sleep checking until interface is running.

2336

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

2337

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

2338

if(interface_is_running(interface)){

2339

break;

2340

}

2341

struct timespec sleeptime = { .tv_nsec = 250000000 };

2342

ret = nanosleep(&sleeptime, NULL);

2343

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

2344

perror_plus("nanosleep");

2345

}

2346

}

2347

2348

errno = old_errno;

2349

return 0;

2350

}

2351

2352

__attribute__((nonnull, warn_unused_result))

2353

int take_down_interface(const char *const interface){

2354

int old_errno = errno;

2355

struct ifreq network;

2356

unsigned int if_index = if_nametoindex(interface);

2357

if(if_index == 0){

2358

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2359

errno = old_errno;

2360

return ENXIO;

2361

}

2362

if(interface_is_up(interface)){

2363

int ret_errno = 0;

2364

int ioctl_errno = 0;

2365

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

2366

ret_errno = errno;

2367

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

2368

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

2369

errno = old_errno;

2370

return ret_errno;

2371

}

2372

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

2373

2374

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

2375

if(sd == -1){

2376

ret_errno = errno;

2377

perror_plus("socket");

2378

errno = old_errno;

2379

return ret_errno;

2380

}

2381

2382

if(debug){

2383

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

2384

interface);

2385

}

2386

2387

/* Raise privileges */

2388

ret_errno = raise_privileges();

2389

if(ret_errno != 0){

2390

errno = ret_errno;

2391

perror_plus("Failed to raise privileges");

2392

}

2393

2394

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

2395

ioctl_errno = errno;

2396

2397

/* If raise_privileges() succeeded above */

2398

if(ret_errno == 0){

2399

/* Lower privileges */

2400

ret_errno = lower_privileges();

2401

if(ret_errno != 0){

2402

errno = ret_errno;

2403

perror_plus("Failed to lower privileges");

2404

}

2405

}

2406

2407

/* Close the socket */

2408

int ret = close(sd);

2409

if(ret == -1){

2410

perror_plus("close");

2411

}

2412

2413

if(ret_setflags == -1){

2414

errno = ioctl_errno;

2415

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2416

errno = old_errno;

2417

return ioctl_errno;

2418

}

2419

} else if(debug){

2420

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

2421

interface);

2422

}

2423

2424

errno = old_errno;

2425

return 0;

1524

2426

}

1525

2427

1526

2428

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

2429

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

2430

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

2431

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

2432

.current_server = NULL, .interfaces = NULL,

2433

.interfaces_size = 0 };

1527

2434

AvahiSServiceBrowser *sb = NULL;

1528

int error;

2435

error_t ret_errno;

1529

2436

int ret;

1530

2437

intmax_t tmpmax;

1531

2438

char *tmp;

1532

2439

int exitcode = EXIT_SUCCESS;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1539

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

1540

bool tempdir_created = false;

2440

char *interfaces_to_take_down = NULL;

2441

size_t interfaces_to_take_down_size = 0;

2442

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

2443

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

2444

char *tempdir = NULL;

1541

2445

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1542

2446

const char *seckey = PATHDIR "/" SECKEY;

1543

2447

const char *pubkey = PATHDIR "/" PUBKEY;

2448

const char *dh_params_file = NULL;

2449

char *interfaces_hooks = NULL;

1544

2450

1545

2451

bool gnutls_initialized = false;

1546

2452

bool gpgme_initialized = false;

1598

2504

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

1599

2505

" Diffie-Hellman key exchange",

1600

2506

.group = 2 },

2507

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

2508

.arg = "FILE",

2509

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

2510

" for the Diffie-Hellman key exchange",

2511

.group = 2 },

1601

2512

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

1602

2513

.arg = "STRING",

1603

2514

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

1637

2548

connect_to = arg;

1638

2549

break;

1639

2550

case 'i': /* --interface */

1640

interface = arg;

2551

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

2552

arg, (int)',');

2553

if(ret_errno != 0){

2554

argp_error(state, "%s", strerror(ret_errno));

2555

}

1641

2556

break;

1642

2557

case 's': /* --seckey */

1643

2558

seckey = arg;

1654

2569

}

1655

2570

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

1656

2571

break;

2572

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

2573

dh_params_file = arg;

2574

break;

1657

2575

case 130: /* --priority */

1658

2576

mc.priority = arg;

1659

2577

break;

1699

2617

.args_doc = "",

1700

2618

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

1701

2619

" passwords from a Mandos server" };

1702

ret = argp_parse(&argp, argc, argv,

1703

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1704

switch(ret){

2620

ret_errno = argp_parse(&argp, argc, argv,

2621

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2622

switch(ret_errno){

1705

2623

case 0:

1706

2624

break;

1707

2625

case ENOMEM:

1708

2626

default:

1709

errno = ret;

2627

errno = ret_errno;

1710

2628

perror_plus("argp_parse");

1711

2629

exitcode = EX_OSERR;

1712

2630

goto end;

1715

2633

goto end;

1716

2634

}

1717

2635

}

1718

2636

1719

2637

{

1720

2638

/* Work around Debian bug #633582:

1721

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

2639

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

1722

2640

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

2641

/* Re-raise privileges */

2642

ret = raise_privileges();

2643

if(ret != 0){

2644

errno = ret;

2645

perror_plus("Failed to raise privileges");

1728

2646

} else {

1729

2647

struct stat st;

1730

2648

1745

2663

}

1746

2664

}

1747

2665

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

2666

close(seckey_fd);

1749

2667

}

1750

2668

}

1751

2669

1752

2670

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

1753

2671

int pubkey_fd = open(pubkey, O_RDONLY);

1754

2672

if(pubkey_fd == -1){

1766

2684

}

1767

2685

}

1768

2686

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

2687

close(pubkey_fd);

2688

}

2689

}

2690

2691

if(dh_params_file != NULL

2692

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

2693

int dhparams_fd = open(dh_params_file, O_RDONLY);

2694

if(dhparams_fd == -1){

2695

perror_plus("open");

2696

} else {

2697

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

2698

if(ret == -1){

2699

perror_plus("fstat");

2700

} else {

2701

if(S_ISREG(st.st_mode)

2702

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

2703

ret = fchown(dhparams_fd, uid, gid);

2704

if(ret == -1){

2705

perror_plus("fchown");

2706

}

2707

}

2708

}

2709

close(dhparams_fd);

2710

}

2711

}

2712

1773

2713

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2714

ret = lower_privileges();

2715

if(ret != 0){

2716

errno = ret;

2717

perror_plus("Failed to lower privileges");

2718

}

2719

}

2720

}

2721

2722

/* Remove invalid interface names (except "none") */

2723

{

2724

char *interface = NULL;

2725

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2726

interface))){

2727

if(strcmp(interface, "none") != 0

2728

and if_nametoindex(interface) == 0){

2729

if(interface[0] != '\0'){

2730

fprintf_plus(stderr, "Not using nonexisting interface"

2731

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

2732

}

2733

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2734

interface = NULL;

1778

2735

}

1779

2736

}

1780

2737

}

1781

2738

1782

2739

/* Run network hooks */

1783

if(not run_network_hooks("start", interface, delay)){

1784

goto end;

2740

{

2741

if(mc.interfaces != NULL){

2742

interfaces_hooks = malloc(mc.interfaces_size);

2743

if(interfaces_hooks == NULL){

2744

perror_plus("malloc");

2745

goto end;

2746

}

2747

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

2748

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

2749

}

2750

run_network_hooks("start", interfaces_hooks != NULL ?

2751

interfaces_hooks : "", delay);

1785

2752

}

1786

2753

1787

2754

if(not debug){

1788

2755

avahi_set_log_function(empty_log);

1789

2756

}

1790

2757

1791

if(interface[0] == '\0'){

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

/* No up interfaces, look for any good interfaces */

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

interface = strdup(direntries[0]->d_name);

1805

if(debug){

1806

fprintf_plus(stderr, "Using interface \"%s\"\n", interface);

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

1823

2758

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1824

2759

from the signal handler */

1825

2760

/* Initialize the pseudo-RNG for Avahi */

1826

2761

srand((unsigned int) time(NULL));

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2762

simple_poll = avahi_simple_poll_new();

2763

if(simple_poll == NULL){

1829

2764

fprintf_plus(stderr,

1830

2765

"Avahi: Failed to create simple poll object.\n");

1831

2766

exitcode = EX_UNAVAILABLE;

1895

2830

}

1896

2831

}

1897

2832

1898

/* If the interface is down, bring it up */

1899

if(strcmp(interface, "none") != 0){

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

if((network.ifr_flags & IFF_UP) == 0){

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2833

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

2834

if(mc.interfaces == NULL){

2835

struct dirent **direntries = NULL;

2836

/* Look for any good interfaces */

2837

ret = scandir(sys_class_net, &direntries, good_interface,

2838

alphasort);

2839

if(ret >= 1){

2840

/* Add all found interfaces to interfaces list */

2841

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

2842

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

2843

direntries[i]->d_name);

2844

if(ret_errno != 0){

2845

errno = ret_errno;

2846

perror_plus("argz_add");

2847

free(direntries[i]);

2848

continue;

2849

}

2850

if(debug){

2851

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

2852

direntries[i]->d_name);

2853

}

2854

free(direntries[i]);

2855

}

2856

free(direntries);

2857

} else {

2858

if(ret == 0){

2859

free(direntries);

2860

}

2861

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

2862

exitcode = EXIT_FAILURE;

2863

goto end;

2864

}

2865

}

2866

2867

/* Bring up interfaces which are down, and remove any "none"s */

2868

{

2869

char *interface = NULL;

2870

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2871

interface))){

2872

/* If interface name is "none", stop bringing up interfaces.

2873

Also remove all instances of "none" from the list */

2874

if(strcmp(interface, "none") == 0){

2875

argz_delete(&mc.interfaces, &mc.interfaces_size,

2876

interface);

2877

interface = NULL;

2878

while((interface = argz_next(mc.interfaces,

2879

mc.interfaces_size, interface))){

2880

if(strcmp(interface, "none") == 0){

2881

argz_delete(&mc.interfaces, &mc.interfaces_size,

2882

interface);

2883

interface = NULL;

1983

2884

}

1984

2885

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2002

2886

break;

2003

2887

}

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

/* We won't need the socket anymore */

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2888

bool interface_was_up = interface_is_up(interface);

2889

errno = bring_up_interface(interface, delay);

2890

if(not interface_was_up){

2891

if(errno != 0){

2892

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

2893

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

2894

} else {

2895

errno = argz_add(&interfaces_to_take_down,

2896

&interfaces_to_take_down_size,

2897

interface);

2898

if(errno != 0){

2899

perror_plus("argz_add");

2900

}

2901

}

2902

}

2903

}

2904

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

2905

fprintf_plus(stderr, "No interfaces were brought up\n");

2906

}

2907

}

2908

2909

/* If we only got one interface, explicitly use only that one */

2910

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2911

if(debug){

2912

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2913

mc.interfaces);

2914

}

2915

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2033

2916

}

2034

2917

2035

2918

if(quit_now){

2036

2919

goto end;

2037

2920

}

2038

2921

2039

ret = init_gnutls_global(pubkey, seckey);

2922

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

2040

2923

if(ret == -1){

2041

2924

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

2042

2925

exitcode = EX_UNAVAILABLE;

2049

2932

goto end;

2050

2933

}

2051

2934

2052

if(mkdtemp(tempdir) == NULL){

2935

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

2936

tempdir = mkdtemp(run_tempdir);

2937

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

2938

if(debug){

2939

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

2940

run_tempdir, old_tempdir);

2941

}

2942

tempdir = mkdtemp(old_tempdir);

2943

}

2944

if(tempdir == NULL){

2053

2945

perror_plus("mkdtemp");

2054

2946

goto end;

2055

2947

}

2056

tempdir_created = true;

2057

2948

2058

2949

if(quit_now){

2059

2950

goto end;

2060

2951

}

2061

2952

2062

if(not init_gpgme(pubkey, seckey, tempdir)){

2953

if(not init_gpgme(pubkey, seckey, tempdir, &mc)){

2063

2954

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

2064

2955

exitcode = EX_UNAVAILABLE;

2065

2956

goto end;

2075

2966

/* Connect directly, do not use Zeroconf */

2076

2967

/* (Mainly meant for debugging) */

2077

2968

char *address = strrchr(connect_to, ':');

2969

2078

2970

if(address == NULL){

2079

2971

fprintf_plus(stderr, "No colon in address\n");

2080

2972

exitcode = EX_USAGE;

2085

2977

goto end;

2086

2978

}

2087

2979

2088

uint16_t port;

2980

in_port_t port;

2089

2981

errno = 0;

2090

2982

tmpmax = strtoimax(address+1, &tmp, 10);

2091

2983

if(errno != 0 or tmp == address+1 or *tmp != '\0'

2092

or tmpmax != (uint16_t)tmpmax){

2984

or tmpmax != (in_port_t)tmpmax){

2093

2985

fprintf_plus(stderr, "Bad port number\n");

2094

2986

exitcode = EX_USAGE;

2095

2987

goto end;

2096

2988

}

2097

2989

2098

2990

if(quit_now){

2099

2991

goto end;

2100

2992

}

2101

2993

2102

port = (uint16_t)tmpmax;

2994

port = (in_port_t)tmpmax;

2103

2995

*address = '\0';

2104

2996

/* Colon in address indicates IPv6 */

2105

2997

int af;

2121

3013

}

2122

3014

2123

3015

while(not quit_now){

2124

ret = start_mandos_communication(address, port, if_index, af);

3016

ret = start_mandos_communication(address, port, if_index, af,

3017

&mc);

2125

3018

if(quit_now or ret == 0){

2126

3019

break;

2127

3020

}

2129

3022

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

2130

3023

(int)retry_interval);

2131

3024

}

2132

sleep((int)retry_interval);

3025

sleep((unsigned int)retry_interval);

2133

3026

}

2134

3027

2135

if (not quit_now){

3028

if(not quit_now){

2136

3029

exitcode = EXIT_SUCCESS;

2137

3030

}

2138

3031

2153

3046

config.publish_domain = 0;

2154

3047

2155

3048

/* Allocate a new server */

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

3049

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3050

&config, NULL, NULL, &ret);

2159

3051

2160

3052

/* Free the Avahi configuration data */

2161

3053

avahi_server_config_free(&config);

2164

3056

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

2165

3057

if(mc.server == NULL){

2166

3058

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

2167

avahi_strerror(error));

3059

avahi_strerror(ret));

2168

3060

exitcode = EX_UNAVAILABLE;

2169

3061

goto end;

2170

3062

}

2176

3068

/* Create the Avahi service browser */

2177

3069

sb = avahi_s_service_browser_new(mc.server, if_index,

2178

3070

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

NULL, 0, browse_callback, NULL);

3071

NULL, 0, browse_callback,

3072

(void *)&mc);

2180

3073

if(sb == NULL){

2181

3074

fprintf_plus(stderr, "Failed to create service browser: %s\n",

2182

3075

avahi_strerror(avahi_server_errno(mc.server)));

2193

3086

if(debug){

2194

3087

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

2195

3088

}

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

3089

3090

ret = avahi_loop_with_timeout(simple_poll,

3091

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

2199

3092

if(debug){

2200

3093

fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",

2201

3094

(ret == 0) ? "successfully" : "with error");

2204

3097

end:

2205

3098

2206

3099

if(debug){

2207

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

3100

if(signal_received){

3101

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

3102

argv[0], signal_received,

3103

strsignal(signal_received));

3104

} else {

3105

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

3106

}

2208

3107

}

2209

3108

2210

3109

/* Cleanup things */

3110

free(mc.interfaces);

3111

2211

3112

if(sb != NULL)

2212

3113

avahi_s_service_browser_free(sb);

2213

3114

2214

3115

if(mc.server != NULL)

2215

3116

avahi_server_free(mc.server);

2216

3117

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

3118

if(simple_poll != NULL)

3119

avahi_simple_poll_free(simple_poll);

2219

3120

2220

3121

if(gnutls_initialized){

2221

3122

gnutls_certificate_free_credentials(mc.cred);

2222

gnutls_global_deinit();

2223

3123

gnutls_dh_params_deinit(mc.dh_params);

2224

3124

}

2225

3125

2233

3133

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

2234

3134

while(mc.current_server != NULL){

2235

3135

server *next = mc.current_server->next;

3136

#ifdef __GNUC__

3137

#pragma GCC diagnostic push

3138

#pragma GCC diagnostic ignored "-Wcast-qual"

3139

#endif

3140

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

3141

#ifdef __GNUC__

3142

#pragma GCC diagnostic pop

3143

#endif

2236

3144

free(mc.current_server);

2237

3145

mc.current_server = next;

2238

3146

}

2239

3147

}

2240

3148

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

3149

/* Re-raise privileges */

2245

3150

{

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

3151

ret = raise_privileges();

3152

if(ret != 0){

3153

errno = ret;

3154

perror_plus("Failed to raise privileges");

3155

} else {

3156

3157

/* Run network hooks */

3158

run_network_hooks("stop", interfaces_hooks != NULL ?

3159

interfaces_hooks : "", delay);

3160

3161

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

3162

{

3163

char *interface = NULL;

3164

while((interface = argz_next(interfaces_to_take_down,

3165

interfaces_to_take_down_size,

3166

interface))){

3167

ret = take_down_interface(interface);

3168

if(ret != 0){

3169

errno = ret;

3170

perror_plus("Failed to take down interface");

3171

}

3172

}

3173

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

3174

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

3175

" down\n");

3176

}

3177

}

2250

3178

}

2251

3179

2252

/* Take down the network interface */

2253

if(take_down_interface and geteuid() == 0){

2254

ret = ioctl(sd, SIOCGIFFLAGS, &network);

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2262

}

2263

}

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2267

}

3180

ret = lower_privileges_permanently();

3181

if(ret != 0){

3182

errno = ret;

3183

perror_plus("Failed to lower privileges permanently");

2268

3184

}

2269

3185

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

3186

3187

free(interfaces_to_take_down);

3188

free(interfaces_hooks);

3189

3190

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

3191

uintmax_t level){

3192

struct dirent **direntries = NULL;

3193

int dret;

3194

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

3195

O_RDONLY

3196

| O_NOFOLLOW

3197

| O_DIRECTORY

3198

| O_PATH));

3199

if(dir_fd == -1){

3200

perror_plus("open");

3201

return;

3202

}

3203

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

3204

notdotentries, alphasort);

3205

if(numentries >= 0){

3206

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

3207

if(debug){

3208

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

3209

dirname, direntries[i]->d_name);

3210

}

3211

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

3212

if(dret == -1){

3213

if(errno == EISDIR){

3214

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

3215

AT_REMOVEDIR);

3216

}

3217

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

3218

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

3219

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

3220

/* Recurse only in this special case */

3221

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

3222

dret = 0;

3223

}

3224

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

3225

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

3226

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

3227

}

3228

}

3229

free(direntries[i]);

3230

}

3231

3232

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

3233

free(direntries);

3234

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3235

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

3236

perror_plus("rmdir");

3237

}

3238

} else {

3239

perror_plus("scandirat");

3240

}

3241

close(dir_fd);

2275

3242

}

2276

3243

2277

3244

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

2278

if(tempdir_created){

2279

struct dirent **direntries = NULL;

2280

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

2285

direntry = direntries[i];

2286

char *fullname = NULL;

2287

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

2288

direntry->d_name);

2289

if(ret < 0){

2290

perror_plus("asprintf");

2291

continue;

2292

}

2293

ret = remove(fullname);

2294

if(ret == -1){

2295

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

2296

strerror(errno));

2297

}

2298

free(fullname);

2299

}

2300

}

2301

2302

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

2303

free(direntries);

2304

if (numentries == -1){

2305

perror_plus("scandir");

2306

}

2307

ret = rmdir(tempdir);

2308

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

2309

perror_plus("rmdir");

2310

}

3245

if(tempdir != NULL){

3246

clean_dir_at(-1, tempdir, 0);

2311

3247

}

2312

3248

2313

3249

if(quit_now){