/mandos/release : revision 237.7.80

9

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

10

*

11

* Everything else is

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

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

23

21

* WITHOUT ANY WARRANTY; without even the implied warranty of

24

22

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

25

23

* General Public License for more details.

26

24

*

27

25

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

28

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

26

* along with this program. If not, see

27

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

29

28

*

30

29

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

31

30

*/

33

32

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

34

33

#ifndef _LARGEFILE_SOURCE

35

34

#define _LARGEFILE_SOURCE

36

#endif /* not _LARGEFILE_SOURCE */

35

#endif

37

36

#ifndef _FILE_OFFSET_BITS

38

37

#define _FILE_OFFSET_BITS 64

39

#endif /* not _FILE_OFFSET_BITS */

38

#endif

40

39

41

40

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

42

41

43

42

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

44

stdout, ferror() */

45

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

43

stdout, ferror(), remove() */

44

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

46

45

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

47

46

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

48

47

strtof(), abort() */

49

48

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

50

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

51

asprintf(), strncpy(), strsignal()

52

*/

49

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

50

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

53

51

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

54

52

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

55

53

sockaddr_in6, PF_INET6,

57

55

opendir(), DIR */

58

56

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

59

57

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

60

inet_pton(), connect(),

61

getnameinfo() */

62

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

58

inet_pton(), connect() */

59

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

63

60

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

64

61

*/

65

62

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

66

63

strtoimax() */

67

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

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

64

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

65

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

72

66

program_invocation_short_name */

73

67

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

74

68

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

79

73

*/

80

74

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

81

75

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

82

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

83

unlinkat() */

84

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

76

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

77

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

85

78

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

86

79

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

87

80

argp_state, struct argp,

95

88

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

96

89

WEXITSTATUS(), WTERMSIG() */

97

90

#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() */

104

91

105

92

#ifdef __linux__

106

93

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

123

110

gnutls_*

124

111

init_gnutls_session(),

125

112

GNUTLS_* */

126

#if GNUTLS_VERSION_NUMBER < 0x030600

127

113

#include <gnutls/openpgp.h>

128

114

/* gnutls_certificate_set_openpgp_key_file(),

129

115

GNUTLS_OPENPGP_FMT_BASE64 */

130

#elif GNUTLS_VERSION_NUMBER >= 0x030606

131

#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,

132

GNUTLS_PKCS_PLAIN,

133

GNUTLS_PKCS_NULL_PASSWORD */

134

#endif

135

116

136

117

/* GPGME */

137

118

#include <gpgme.h> /* All GPGME types, constants and

145

126

#define PATHDIR "/conf/conf.d/mandos"

146

127

#define SECKEY "seckey.txt"

147

128

#define PUBKEY "pubkey.txt"

148

#define TLS_PRIVKEY "tls-privkey.pem"

149

#define TLS_PUBKEY "tls-pubkey.pem"

150

129

#define HOOKDIR "/lib/mandos/network-hooks.d"

151

130

152

131

bool debug = false;

156

135

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

157

136

char *connect_to = NULL;

158

137

const char *hookdir = HOOKDIR;

159

int hookdir_fd = -1;

160

uid_t uid = 65534;

161

gid_t gid = 65534;

162

138

163

139

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

164

140

typedef struct server{

165

141

const char *ip;

166

in_port_t port;

142

uint16_t port;

167

143

AvahiIfIndex if_index;

168

144

int af;

169

145

struct timespec last_seen;

173

149

174

150

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

175

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

176

153

AvahiServer *server;

177

154

gnutls_certificate_credentials_t cred;

178

155

unsigned int dh_bits;

180

157

const char *priority;

181

158

gpgme_ctx_t ctx;

182

159

server *current_server;

183

char *interfaces;

184

size_t interfaces_size;

185

160

} mandos_context;

186

161

187

/* global so signal handler can reach it*/

188

AvahiSimplePoll *simple_poll;

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 };

189

167

190

168

sig_atomic_t quit_now = 0;

191

169

int signal_received = 0;

192

170

193

171

/* Function to use when printing errors */

194

172

void perror_plus(const char *print_text){

195

int e = errno;

196

173

fprintf(stderr, "Mandos plugin %s: ",

197

174

program_invocation_short_name);

198

errno = e;

199

175

perror(print_text);

200

176

}

201

177

202

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

178

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

203

179

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

204

180

va_list ap;

205

181

va_start (ap, format);

206

182

207

183

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

208

184

program_invocation_short_name));

209

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

185

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

210

186

}

211

187

212

188

/*

214

190

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

215

191

* "buffer_length" is how much is already used.

216

192

*/

217

__attribute__((nonnull, warn_unused_result))

218

193

size_t incbuffer(char **buffer, size_t buffer_length,

219

194

size_t buffer_capacity){

220

195

if(buffer_length + BUFFER_SIZE > buffer_capacity){

221

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

222

if(new_buf == NULL){

223

int old_errno = errno;

224

free(*buffer);

225

errno = old_errno;

226

*buffer = NULL;

196

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

197

if(buffer == NULL){

227

198

return 0;

228

199

}

229

*buffer = new_buf;

230

200

buffer_capacity += BUFFER_SIZE;

231

201

}

232

202

return buffer_capacity;

233

203

}

234

204

235

205

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

236

__attribute__((nonnull, warn_unused_result))

237

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

238

int af, server **current_server){

206

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

207

int af){

239

208

int ret;

240

209

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

241

210

if(new_server == NULL){

248

217

.af = af };

249

218

if(new_server->ip == NULL){

250

219

perror_plus("strdup");

251

free(new_server);

252

return false;

253

}

254

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

255

if(ret == -1){

256

perror_plus("clock_gettime");

257

#ifdef __GNUC__

258

#pragma GCC diagnostic push

259

#pragma GCC diagnostic ignored "-Wcast-qual"

260

#endif

261

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

262

#ifdef __GNUC__

263

#pragma GCC diagnostic pop

264

#endif

265

free(new_server);

266

220

return false;

267

221

}

268

222

/* Special case of first server */

269

if(*current_server == NULL){

223

if (mc.current_server == NULL){

270

224

new_server->next = new_server;

271

225

new_server->prev = new_server;

272

*current_server = new_server;

226

mc.current_server = new_server;

227

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

273

228

} else {

274

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

275

new_server->next = *current_server;

276

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

229

new_server->next = mc.current_server;

230

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

277

231

new_server->prev->next = new_server;

278

(*current_server)->prev = new_server;

232

mc.current_server->prev = new_server;

233

}

234

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

235

if(ret == -1){

236

perror_plus("clock_gettime");

237

return false;

279

238

}

280

239

return true;

281

240

}

282

241

283

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

284

__attribute__((warn_unused_result))

285

int raise_privileges(void){

286

int old_errno = errno;

287

int ret = 0;

288

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

289

ret = errno;

290

}

291

errno = old_errno;

292

return ret;

293

}

294

295

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

296

__attribute__((warn_unused_result))

297

int raise_privileges_permanently(void){

298

int old_errno = errno;

299

int ret = raise_privileges();

300

if(ret != 0){

301

errno = old_errno;

302

return ret;

303

}

304

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

305

ret = errno;

306

}

307

errno = old_errno;

308

return ret;

309

}

310

311

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

312

__attribute__((warn_unused_result))

313

int lower_privileges(void){

314

int old_errno = errno;

315

int ret = 0;

316

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

317

ret = errno;

318

}

319

errno = old_errno;

320

return ret;

321

}

322

323

/* Lower privileges permanently */

324

__attribute__((warn_unused_result))

325

int lower_privileges_permanently(void){

326

int old_errno = errno;

327

int ret = 0;

328

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

329

ret = errno;

330

}

331

errno = old_errno;

332

return ret;

333

}

334

335

242

/*

336

243

* Initialize GPGME.

337

244

*/

338

__attribute__((nonnull, warn_unused_result))

339

static bool init_gpgme(const char * const seckey,

340

const char * const pubkey,

341

const char * const tempdir,

342

mandos_context *mc){

245

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

246

const char *tempdir){

343

247

gpgme_error_t rc;

344

248

gpgme_engine_info_t engine_info;

345

249

250

346

251

/*

347

252

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

348

253

*/

349

bool import_key(const char * const filename){

254

bool import_key(const char *filename){

350

255

int ret;

351

256

int fd;

352

257

gpgme_data_t pgp_data;

357

262

return false;

358

263

}

359

264

360

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

361

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

362

do {

363

{

364

time_t currtime = time(NULL);

365

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

366

struct tm tm;

367

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

368

perror_plus("gmtime_r");

369

break;

370

}

371

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

372

break;

373

}

374

if(debug){

375

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

376

}

377

} else {

378

if(debug){

379

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

380

}

381

}

382

}

383

struct stat keystat;

384

ret = fstat(fd, &keystat);

385

if(ret != 0){

386

perror_plus("fstat");

387

break;

388

}

389

ret = raise_privileges();

390

if(ret != 0){

391

errno = ret;

392

perror_plus("Failed to raise privileges");

393

break;

394

}

395

if(debug){

396

fprintf_plus(stderr,

397

"Setting system clock to key file mtime");

398

}

399

time_t keytime = keystat.st_mtim.tv_sec;

400

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

401

perror_plus("stime");

402

}

403

ret = lower_privileges();

404

if(ret != 0){

405

errno = ret;

406

perror_plus("Failed to lower privileges");

407

}

408

} while(false);

409

410

265

rc = gpgme_data_new_from_fd(&pgp_data, fd);

411

266

if(rc != GPG_ERR_NO_ERROR){

412

267

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

414

269

return false;

415

270

}

416

271

417

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

272

rc = gpgme_op_import(mc.ctx, pgp_data);

418

273

if(rc != GPG_ERR_NO_ERROR){

419

274

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

420

275

gpgme_strsource(rc), gpgme_strerror(rc));

421

276

return false;

422

277

}

423

{

424

gpgme_import_result_t import_result

425

= gpgme_op_import_result(mc->ctx);

426

if((import_result->imported < 1

427

or import_result->not_imported > 0)

428

and import_result->unchanged == 0){

429

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

430

fprintf_plus(stderr,

431

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

432

import_result->considered);

433

fprintf_plus(stderr,

434

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

435

import_result->no_user_id);

436

fprintf_plus(stderr,

437

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

438

import_result->imported);

439

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

440

import_result->imported_rsa);

441

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

442

import_result->unchanged);

443

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

444

import_result->new_user_ids);

445

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

446

import_result->new_sub_keys);

447

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

448

import_result->new_signatures);

449

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

450

import_result->new_revocations);

451

fprintf_plus(stderr,

452

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

453

import_result->secret_read);

454

fprintf_plus(stderr,

455

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

456

import_result->secret_imported);

457

fprintf_plus(stderr,

458

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

459

import_result->secret_unchanged);

460

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

461

import_result->not_imported);

462

for(gpgme_import_status_t import_status

463

= import_result->imports;

464

import_status != NULL;

465

import_status = import_status->next){

466

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

467

import_status->fpr);

468

if(import_status->result != GPG_ERR_NO_ERROR){

469

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

470

gpgme_strsource(import_status->result),

471

gpgme_strerror(import_status->result));

472

}

473

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

474

fprintf_plus(stderr,

475

import_status->status & GPGME_IMPORT_NEW

476

? "The key was new.\n"

477

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

478

fprintf_plus(stderr,

479

import_status->status & GPGME_IMPORT_UID

480

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

481

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

482

fprintf_plus(stderr,

483

import_status->status & GPGME_IMPORT_SIG

484

? "The key contained new signatures.\n"

485

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

486

fprintf_plus(stderr,

487

import_status->status & GPGME_IMPORT_SUBKEY

488

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

489

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

490

fprintf_plus(stderr,

491

import_status->status & GPGME_IMPORT_SECRET

492

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

493

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

494

}

495

return false;

496

}

497

}

498

278

499

ret = close(fd);

279

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

500

280

if(ret == -1){

501

281

perror_plus("close");

502

282

}

539

319

}

540

320

541

321

/* Create new GPGME "context" */

542

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

322

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

543

323

if(rc != GPG_ERR_NO_ERROR){

544

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

545

gpgme_strsource(rc), gpgme_strerror(rc));

324

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

325

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

326

gpgme_strerror(rc));

546

327

return false;

547

328

}

548

329

557

338

* Decrypt OpenPGP data.

558

339

* Returns -1 on error

559

340

*/

560

__attribute__((nonnull, warn_unused_result))

561

341

static ssize_t pgp_packet_decrypt(const char *cryptotext,

562

342

size_t crypto_size,

563

char **plaintext,

564

mandos_context *mc){

343

char **plaintext){

565

344

gpgme_data_t dh_crypto, dh_plain;

566

345

gpgme_error_t rc;

567

346

ssize_t ret;

584

363

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

585

364

rc = gpgme_data_new(&dh_plain);

586

365

if(rc != GPG_ERR_NO_ERROR){

587

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

366

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

367

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

588

368

gpgme_strsource(rc), gpgme_strerror(rc));

589

369

gpgme_data_release(dh_crypto);

590

370

return -1;

592

372

593

373

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

594

374

data buffer */

595

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

375

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

596

376

if(rc != GPG_ERR_NO_ERROR){

597

377

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

598

378

gpgme_strsource(rc), gpgme_strerror(rc));

599

379

plaintext_length = -1;

600

380

if(debug){

601

381

gpgme_decrypt_result_t result;

602

result = gpgme_op_decrypt_result(mc->ctx);

382

result = gpgme_op_decrypt_result(mc.ctx);

603

383

if(result == NULL){

604

384

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

605

385

} else {

606

if(result->unsupported_algorithm != NULL) {

607

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

608

result->unsupported_algorithm);

609

}

610

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

611

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

386

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

387

result->unsupported_algorithm);

388

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

389

result->wrong_key_usage);

612

390

if(result->file_name != NULL){

613

391

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

614

392

}

615

616

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

617

r = r->next){

393

gpgme_recipient_t recipient;

394

recipient = result->recipients;

395

while(recipient != NULL){

618

396

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

619

gpgme_pubkey_algo_name(r->pubkey_algo));

620

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

397

gpgme_pubkey_algo_name

398

(recipient->pubkey_algo));

399

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

621

400

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

622

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

401

recipient->status == GPG_ERR_NO_SECKEY

402

? "No" : "Yes");

403

recipient = recipient->next;

623

404

}

624

405

}

625

406

}

681

462

return plaintext_length;

682

463

}

683

464

684

__attribute__((warn_unused_result, const))

685

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

686

if(str == NULL)

687

return "(unknown)";

688

return str;

689

}

690

691

__attribute__((warn_unused_result))

692

static const char *safer_gnutls_strerror(int value){

693

const char *ret = gnutls_strerror(value);

694

return safe_string(ret);

465

static const char * safer_gnutls_strerror(int value){

466

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

467

-Wunreachable-code */

468

if(ret == NULL)

469

ret = "(unknown)";

470

return ret;

695

471

}

696

472

697

473

/* GnuTLS log function callback */

698

__attribute__((nonnull))

699

474

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

700

475

const char* string){

701

476

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

702

477

}

703

478

704

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

705

479

static int init_gnutls_global(const char *pubkeyfilename,

706

const char *seckeyfilename,

707

const char *dhparamsfilename,

708

mandos_context *mc){

480

const char *seckeyfilename){

709

481

int ret;

710

482

711

483

if(debug){

712

484

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

713

485

}

714

486

487

ret = gnutls_global_init();

488

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

491

return -1;

492

}

493

715

494

if(debug){

716

495

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

717

496

* - GnuTLS manual

721

500

}

722

501

723

502

/* OpenPGP credentials */

724

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

ret = gnutls_certificate_allocate_credentials(&mc.cred);

725

504

if(ret != GNUTLS_E_SUCCESS){

726

505

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

727

506

safer_gnutls_strerror(ret));

507

gnutls_global_deinit();

728

508

return -1;

729

509

}

730

510

731

511

if(debug){

732

fprintf_plus(stderr, "Attempting to use public key %s and"

733

" private key %s as GnuTLS credentials\n",

512

fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"

513

" secret key %s as GnuTLS credentials\n",

734

514

pubkeyfilename,

735

515

seckeyfilename);

736

516

}

737

517

738

#if GNUTLS_VERSION_NUMBER >= 0x030606

739

ret = gnutls_certificate_set_rawpk_key_file

740

(mc->cred, pubkeyfilename, seckeyfilename,

741

GNUTLS_X509_FMT_PEM, /* format */

742

NULL, /* pass */

743

/* key_usage */

744

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

745

NULL, /* names */

746

0, /* names_length */

747

/* privkey_flags */

748

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

749

0); /* pkcs11_flags */

750

#elif GNUTLS_VERSION_NUMBER < 0x030600

751

518

ret = gnutls_certificate_set_openpgp_key_file

752

(mc->cred, pubkeyfilename, seckeyfilename,

519

(mc.cred, pubkeyfilename, seckeyfilename,

753

520

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

756

#endif

757

521

if(ret != GNUTLS_E_SUCCESS){

758

522

fprintf_plus(stderr,

759

"Error[%d] while reading the key pair ('%s',"

523

"Error[%d] while reading the OpenPGP key pair ('%s',"

760

524

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

761

525

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

762

526

safer_gnutls_strerror(ret));

764

528

}

765

529

766

530

/* GnuTLS server initialization */

767

ret = gnutls_dh_params_init(&mc->dh_params);

531

ret = gnutls_dh_params_init(&mc.dh_params);

768

532

if(ret != GNUTLS_E_SUCCESS){

769

533

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

770

534

" initialization: %s\n",

771

535

safer_gnutls_strerror(ret));

772

536

goto globalfail;

773

537

}

774

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

775

if(dhparamsfilename != NULL){

776

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

777

do {

778

int dhpfile = open(dhparamsfilename, O_RDONLY);

779

if(dhpfile == -1){

780

perror_plus("open");

781

dhparamsfilename = NULL;

782

break;

783

}

784

size_t params_capacity = 0;

785

while(true){

786

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

787

(size_t)params.size,

788

(size_t)params_capacity);

789

if(params_capacity == 0){

790

perror_plus("incbuffer");

791

free(params.data);

792

params.data = NULL;

793

dhparamsfilename = NULL;

794

break;

795

}

796

ssize_t bytes_read = read(dhpfile,

797

params.data + params.size,

798

BUFFER_SIZE);

799

/* EOF */

800

if(bytes_read == 0){

801

break;

802

}

803

/* check bytes_read for failure */

804

if(bytes_read < 0){

805

perror_plus("read");

806

free(params.data);

807

params.data = NULL;

808

dhparamsfilename = NULL;

809

break;

810

}

811

params.size += (unsigned int)bytes_read;

812

}

813

ret = close(dhpfile);

814

if(ret == -1){

815

perror_plus("close");

816

}

817

if(params.data == NULL){

818

dhparamsfilename = NULL;

819

}

820

if(dhparamsfilename == NULL){

821

break;

822

}

823

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

824

GNUTLS_X509_FMT_PEM);

825

if(ret != GNUTLS_E_SUCCESS){

826

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

827

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

828

safer_gnutls_strerror(ret));

829

dhparamsfilename = NULL;

830

}

831

free(params.data);

832

} while(false);

833

}

834

if(dhparamsfilename == NULL){

835

if(mc->dh_bits == 0){

836

#if GNUTLS_VERSION_NUMBER < 0x030600

837

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

838

/* Try to read the private key file */

839

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

840

do {

841

int secfile = open(seckeyfilename, O_RDONLY);

842

if(secfile == -1){

843

perror_plus("open");

844

break;

845

}

846

size_t buffer_capacity = 0;

847

while(true){

848

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

849

(size_t)buffer.size,

850

(size_t)buffer_capacity);

851

if(buffer_capacity == 0){

852

perror_plus("incbuffer");

853

free(buffer.data);

854

buffer.data = NULL;

855

break;

856

}

857

ssize_t bytes_read = read(secfile,

858

buffer.data + buffer.size,

859

BUFFER_SIZE);

860

/* EOF */

861

if(bytes_read == 0){

862

break;

863

}

864

/* check bytes_read for failure */

865

if(bytes_read < 0){

866

perror_plus("read");

867

free(buffer.data);

868

buffer.data = NULL;

869

break;

870

}

871

buffer.size += (unsigned int)bytes_read;

872

}

873

close(secfile);

874

} while(false);

875

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

876

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

877

if(buffer.data != NULL){

878

{

879

gnutls_openpgp_privkey_t privkey = NULL;

880

ret = gnutls_openpgp_privkey_init(&privkey);

881

if(ret != GNUTLS_E_SUCCESS){

882

fprintf_plus(stderr, "Error initializing OpenPGP key"

883

" structure: %s",

884

safer_gnutls_strerror(ret));

885

free(buffer.data);

886

buffer.data = NULL;

887

} else {

888

ret = gnutls_openpgp_privkey_import

889

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

890

if(ret != GNUTLS_E_SUCCESS){

891

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

892

safer_gnutls_strerror(ret));

893

privkey = NULL;

894

}

895

free(buffer.data);

896

buffer.data = NULL;

897

if(privkey != NULL){

898

/* Use private key to suggest an appropriate

899

sec_param */

900

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

901

gnutls_openpgp_privkey_deinit(privkey);

902

if(debug){

903

fprintf_plus(stderr, "This OpenPGP key implies using"

904

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

905

safe_string(gnutls_sec_param_get_name

906

(sec_param)));

907

}

908

}

909

}

910

}

911

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

912

/* Err on the side of caution */

913

sec_param = GNUTLS_SEC_PARAM_ULTRA;

914

if(debug){

915

fprintf_plus(stderr, "Falling back to security parameter"

916

" \"%s\"\n",

917

safe_string(gnutls_sec_param_get_name

918

(sec_param)));

919

}

920

}

921

}

922

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

923

if(uret != 0){

924

mc->dh_bits = uret;

925

if(debug){

926

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

927

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

928

safe_string(gnutls_sec_param_get_name

929

(sec_param)),

930

mc->dh_bits);

931

}

932

} else {

933

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

934

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

935

safe_string(gnutls_sec_param_get_name

936

(sec_param)),

937

safer_gnutls_strerror(ret));

938

goto globalfail;

939

}

940

#endif

941

} else { /* dh_bits != 0 */

942

if(debug){

943

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

944

mc->dh_bits);

945

}

946

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

947

if(ret != GNUTLS_E_SUCCESS){

948

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

949

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

950

safer_gnutls_strerror(ret));

951

goto globalfail;

952

}

953

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

954

}

955

}

538

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

539

if(ret != GNUTLS_E_SUCCESS){

540

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

541

safer_gnutls_strerror(ret));

542

goto globalfail;

543

}

544

545

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

956

546

957

547

return 0;

958

548

959

549

globalfail:

960

550

961

gnutls_certificate_free_credentials(mc->cred);

962

gnutls_dh_params_deinit(mc->dh_params);

551

gnutls_certificate_free_credentials(mc.cred);

552

gnutls_global_deinit();

553

gnutls_dh_params_deinit(mc.dh_params);

963

554

return -1;

964

555

}

965

556

966

__attribute__((nonnull, warn_unused_result))

967

static int init_gnutls_session(gnutls_session_t *session,

968

mandos_context *mc){

557

static int init_gnutls_session(gnutls_session_t *session){

969

558

int ret;

970

559

/* GnuTLS session creation */

971

560

do {

972

ret = gnutls_init(session, (GNUTLS_SERVER

973

#if GNUTLS_VERSION_NUMBER >= 0x030506

974

| GNUTLS_NO_TICKETS

975

#endif

976

#if GNUTLS_VERSION_NUMBER >= 0x030606

977

| GNUTLS_ENABLE_RAWPK

978

#endif

979

));

561

ret = gnutls_init(session, GNUTLS_SERVER);

980

562

if(quit_now){

981

563

return -1;

982

564

}

990

572

{

991

573

const char *err;

992

574

do {

993

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

575

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

994

576

if(quit_now){

995

577

gnutls_deinit(*session);

996

578

return -1;

1007

589

1008

590

do {

1009

591

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

1010

mc->cred);

592

mc.cred);

1011

593

if(quit_now){

1012

594

gnutls_deinit(*session);

1013

595

return -1;

1023

605

/* ignore client certificate if any. */

1024

606

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

1025

607

608

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

609

1026

610

return 0;

1027

611

}

1028

612

1030

614

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

1031

615

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

1032

616

1033

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

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool add_delete_local_route(const bool add,

1036

const char *address,

1037

AvahiIfIndex if_index){

1038

int ret;

1039

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

1040

char add_arg[] = "add";

1041

char delete_arg[] = "delete";

1042

char debug_flag[] = "--debug";

1043

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

1044

if(pluginhelperdir == NULL){

1045

if(debug){

1046

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

1047

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

1048

}

1049

return false;

1050

}

1051

1052

char interface[IF_NAMESIZE];

1053

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

1054

perror_plus("if_indextoname");

1055

return false;

1056

}

1057

1058

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

1059

if(devnull == -1){

1060

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

1061

return false;

1062

}

1063

pid_t pid = fork();

1064

if(pid == 0){

1065

/* Child */

1066

/* Raise privileges */

1067

errno = raise_privileges_permanently();

1068

if(errno != 0){

1069

perror_plus("Failed to raise privileges");

1070

/* _exit(EX_NOPERM); */

1071

} else {

1072

/* Set group */

1073

errno = 0;

1074

ret = setgid(0);

1075

if(ret == -1){

1076

perror_plus("setgid");

1077

_exit(EX_NOPERM);

1078

}

1079

/* Reset supplementary groups */

1080

errno = 0;

1081

ret = setgroups(0, NULL);

1082

if(ret == -1){

1083

perror_plus("setgroups");

1084

_exit(EX_NOPERM);

1085

}

1086

}

1087

ret = dup2(devnull, STDIN_FILENO);

1088

if(ret == -1){

1089

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

1090

_exit(EX_OSERR);

1091

}

1092

ret = close(devnull);

1093

if(ret == -1){

1094

perror_plus("close");

1095

_exit(EX_OSERR);

1096

}

1097

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1098

if(ret == -1){

1099

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

1100

_exit(EX_OSERR);

1101

}

1102

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

1103

O_RDONLY

1104

| O_DIRECTORY

1105

| O_PATH

1106

| O_CLOEXEC));

1107

if(helperdir_fd == -1){

1108

perror_plus("open");

1109

_exit(EX_UNAVAILABLE);

1110

}

1111

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

1112

helper, O_RDONLY));

1113

if(helper_fd == -1){

1114

perror_plus("openat");

1115

close(helperdir_fd);

1116

_exit(EX_UNAVAILABLE);

1117

}

1118

close(helperdir_fd);

1119

#ifdef __GNUC__

1120

#pragma GCC diagnostic push

1121

#pragma GCC diagnostic ignored "-Wcast-qual"

1122

#endif

1123

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

1124

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

1125

interface, debug ? debug_flag : NULL, NULL },

1126

environ) == -1){

1127

#ifdef __GNUC__

1128

#pragma GCC diagnostic pop

1129

#endif

1130

perror_plus("fexecve");

1131

_exit(EXIT_FAILURE);

1132

}

1133

}

1134

if(pid == -1){

1135

perror_plus("fork");

1136

return false;

1137

}

1138

int status;

1139

pid_t pret = -1;

1140

errno = 0;

1141

do {

1142

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

1143

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

1144

int errno_raising = 0;

1145

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

1146

errno_raising = errno;

1147

perror_plus("Failed to raise privileges in order to"

1148

" kill helper program");

1149

}

1150

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

1151

perror_plus("kill");

1152

}

1153

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

1154

perror_plus("Failed to lower privileges after killing"

1155

" helper program");

1156

}

1157

return false;

1158

}

1159

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

1160

if(pret == -1){

1161

perror_plus("waitpid");

1162

return false;

1163

}

1164

if(WIFEXITED(status)){

1165

if(WEXITSTATUS(status) != 0){

1166

fprintf_plus(stderr, "Error: iprouteadddel exited"

1167

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

1168

return false;

1169

}

1170

return true;

1171

}

1172

if(WIFSIGNALED(status)){

1173

fprintf_plus(stderr, "Error: iprouteadddel died by"

1174

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

1175

return false;

1176

}

1177

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

1178

return false;

1179

}

1180

1181

__attribute__((nonnull, warn_unused_result))

1182

static bool add_local_route(const char *address,

1183

AvahiIfIndex if_index){

1184

if(debug){

1185

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

1186

}

1187

return add_delete_local_route(true, address, if_index);

1188

}

1189

1190

__attribute__((nonnull, warn_unused_result))

1191

static bool delete_local_route(const char *address,

1192

AvahiIfIndex if_index){

1193

if(debug){

1194

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

1195

}

1196

return add_delete_local_route(false, address, if_index);

1197

}

1198

1199

617

/* Called when a Mandos server is found */

1200

__attribute__((nonnull, warn_unused_result))

1201

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

618

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

1202

619

AvahiIfIndex if_index,

1203

int af, mandos_context *mc){

620

int af){

1204

621

int ret, tcp_sd = -1;

1205

622

ssize_t sret;

1206

struct sockaddr_storage to;

623

union {

624

struct sockaddr_in in;

625

struct sockaddr_in6 in6;

626

} to;

1207

627

char *buffer = NULL;

1208

628

char *decrypted_buffer = NULL;

1209

629

size_t buffer_length = 0;

1212

632

int retval = -1;

1213

633

gnutls_session_t session;

1214

634

int pf; /* Protocol family */

1215

bool route_added = false;

1216

635

1217

636

errno = 0;

1218

637

1234

653

return -1;

1235

654

}

1236

655

1237

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

1238

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

1239

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

1240

bool match = false;

1241

{

1242

char *interface = NULL;

1243

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

1244

mc->interfaces_size,

1245

interface))){

1246

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

1247

match = true;

1248

break;

1249

}

1250

}

1251

}

1252

if(not match){

1253

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

1254

connect to the server */

1255

if(debug){

1256

char interface[IF_NAMESIZE];

1257

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

1258

perror_plus("if_indextoname");

1259

} else {

1260

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

1261

" \"%s\"\n",

1262

if_indextoname((unsigned int)if_index,

1263

interface));

1264

}

1265

}

1266

return -1;

1267

}

1268

}

1269

1270

ret = init_gnutls_session(&session, mc);

656

ret = init_gnutls_session(&session);

1271

657

if(ret != 0){

1272

658

return -1;

1273

659

}

1274

660

1275

661

if(debug){

1276

662

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

1277

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

663

PRIu16 "\n", ip, port);

1278

664

}

1279

665

1280

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

666

tcp_sd = socket(pf, SOCK_STREAM, 0);

1281

667

if(tcp_sd < 0){

1282

668

int e = errno;

1283

669

perror_plus("socket");

1290

676

goto mandos_end;

1291

677

}

1292

678

679

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

1293

680

if(af == AF_INET6){

1294

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

1295

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

1296

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

681

to.in6.sin6_family = (sa_family_t)af;

682

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

1297

683

} else { /* IPv4 */

1298

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

1299

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

1300

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

684

to.in.sin_family = (sa_family_t)af;

685

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

1301

686

}

1302

687

if(ret < 0 ){

1303

688

int e = errno;

1312

697

goto mandos_end;

1313

698

}

1314

699

if(af == AF_INET6){

1315

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

1316

if(IN6_IS_ADDR_LINKLOCAL

1317

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

700

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

701

-Wconversion and

702

-Wunreachable-code */

703

704

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

705

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

706

-Wunreachable-code*/

1318

707

if(if_index == AVAHI_IF_UNSPEC){

1319

708

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

1320

709

" incomplete without a network interface\n");

1322

711

goto mandos_end;

1323

712

}

1324

713

/* Set the network interface number as scope */

1325

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

714

to.in6.sin6_scope_id = (uint32_t)if_index;

1326

715

}

1327

716

} else {

1328

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

717

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

718

-Wconversion and

719

-Wunreachable-code */

1329

720

}

1330

721

1331

722

if(quit_now){

1339

730

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

1340

731

perror_plus("if_indextoname");

1341

732

} else {

1342

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

1343

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

733

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

734

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

1344

735

}

1345

736

} else {

1346

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

1347

ip, (uintmax_t)port);

737

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

738

ip, port);

1348

739

}

1349

740

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1350

741

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1351

if(af == AF_INET6){

1352

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

1353

sizeof(struct sockaddr_in6),

1354

addrstr, sizeof(addrstr), NULL, 0,

1355

NI_NUMERICHOST);

1356

} else {

1357

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

1358

sizeof(struct sockaddr_in),

1359

addrstr, sizeof(addrstr), NULL, 0,

1360

NI_NUMERICHOST);

1361

}

1362

if(ret == EAI_SYSTEM){

1363

perror_plus("getnameinfo");

1364

} else if(ret != 0) {

1365

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

1366

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

1367

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

1368

}

1369

}

1370

1371

if(quit_now){

1372

errno = EINTR;

1373

goto mandos_end;

1374

}

1375

1376

while(true){

1377

if(af == AF_INET6){

1378

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

1379

sizeof(struct sockaddr_in6));

1380

} else {

1381

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

1382

sizeof(struct sockaddr_in));

1383

}

1384

if(ret < 0){

1385

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

1386

and if_index != AVAHI_IF_UNSPEC

1387

and connect_to == NULL

1388

and not route_added and

1389

((af == AF_INET6 and not

1390

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1391

&to)->sin6_addr)))

1392

or (af == AF_INET and

1393

/* Not a a IPv4LL address */

1394

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

1395

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

1396

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

1397

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

1398

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

1399

connect to a Mandos server announced by Avahi on a server

1400

host with a global address. Work around this by retrying

1401

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

1402

1403

Avahi bug reference:

1404

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

1405

https://bugs.debian.org/587961

1406

*/

1407

if(debug){

1408

fprintf_plus(stderr, "Mandos server unreachable, trying"

1409

" direct route\n");

1410

}

1411

int e = errno;

1412

route_added = add_local_route(ip, if_index);

1413

if(route_added){

1414

continue;

1415

}

1416

errno = e;

1417

}

1418

if(errno != ECONNREFUSED or debug){

1419

int e = errno;

1420

perror_plus("connect");

1421

errno = e;

1422

}

1423

goto mandos_end;

1424

}

1425

1426

if(quit_now){

1427

errno = EINTR;

1428

goto mandos_end;

1429

}

1430

break;

742

const char *pcret;

743

if(af == AF_INET6){

744

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

745

sizeof(addrstr));

746

} else {

747

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

748

sizeof(addrstr));

749

}

750

if(pcret == NULL){

751

perror_plus("inet_ntop");

752

} else {

753

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

754

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

755

}

756

}

757

}

758

759

if(quit_now){

760

errno = EINTR;

761

goto mandos_end;

762

}

763

764

if(af == AF_INET6){

765

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

766

} else {

767

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

768

}

769

if(ret < 0){

770

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

771

int e = errno;

772

perror_plus("connect");

773

errno = e;

774

}

775

goto mandos_end;

776

}

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

1431

781

}

1432

782

1433

783

const char *out = mandos_protocol_version;

1469

819

goto mandos_end;

1470

820

}

1471

821

1472

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

1473

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

1474

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

1475

gnutls_transport_set_ptr(session,

1476

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

822

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

823

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1477

824

1478

825

if(quit_now){

1479

826

errno = EINTR;

1584

931

if(buffer_length > 0){

1585

932

ssize_t decrypted_buffer_size;

1586

933

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1587

&decrypted_buffer, mc);

934

&decrypted_buffer);

1588

935

if(decrypted_buffer_size >= 0){

1589

936

1590

clearerr(stdout);

1591

937

written = 0;

1592

938

while(written < (size_t) decrypted_buffer_size){

1593

939

if(quit_now){

1609

955

}

1610

956

written += (size_t)ret;

1611

957

}

1612

ret = fflush(stdout);

1613

if(ret != 0){

1614

int e = errno;

1615

if(debug){

1616

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

1617

strerror(errno));

1618

}

1619

errno = e;

1620

goto mandos_end;

1621

}

1622

958

retval = 0;

1623

959

}

1624

960

}

1627

963

1628

964

mandos_end:

1629

965

{

1630

if(route_added){

1631

if(not delete_local_route(ip, if_index)){

1632

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

1633

" interface %d", ip, if_index);

1634

}

1635

}

1636

966

int e = errno;

1637

967

free(decrypted_buffer);

1638

968

free(buffer);

1639

969

if(tcp_sd >= 0){

1640

ret = close(tcp_sd);

970

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

1641

971

}

1642

972

if(ret == -1){

1643

973

if(e == 0){

1668

998

AVAHI_GCC_UNUSED AvahiStringList *txt,

1669

999

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1670

1000

flags,

1671

void *mc){

1672

if(r == NULL){

1673

return;

1674

}

1001

AVAHI_GCC_UNUSED void* userdata){

1002

assert(r);

1675

1003

1676

1004

/* Called whenever a service has been resolved successfully or

1677

1005

timed out */

1678

1006

1679

1007

if(quit_now){

1680

avahi_s_service_resolver_free(r);

1681

1008

return;

1682

1009

}

1683

1010

1687

1014

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

1688

1015

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

1689

1016

domain,

1690

avahi_strerror(avahi_server_errno

1691

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

1017

avahi_strerror(avahi_server_errno(mc.server)));

1692

1018

break;

1693

1019

1694

1020

case AVAHI_RESOLVER_FOUND:

1700

1026

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

1701

1027

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

1702

1028

}

1703

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

1704

interface,

1705

avahi_proto_to_af(proto),

1706

mc);

1029

int ret = start_mandos_communication(ip, port, interface,

1030

avahi_proto_to_af(proto));

1707

1031

if(ret == 0){

1708

avahi_simple_poll_quit(simple_poll);

1032

avahi_simple_poll_quit(mc.simple_poll);

1709

1033

} else {

1710

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

1711

avahi_proto_to_af(proto),

1712

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

1034

if(not add_server(ip, port, interface,

1035

avahi_proto_to_af(proto))){

1713

1036

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

1714

1037

" list\n", name);

1715

1038

}

1728

1051

const char *domain,

1729

1052

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1730

1053

flags,

1731

void *mc){

1732

if(b == NULL){

1733

return;

1734

}

1054

AVAHI_GCC_UNUSED void* userdata){

1055

assert(b);

1735

1056

1736

1057

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

1737

1058

is removed from the LAN */

1745

1066

case AVAHI_BROWSER_FAILURE:

1746

1067

1747

1068

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

1748

avahi_strerror(avahi_server_errno

1749

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

1750

avahi_simple_poll_quit(simple_poll);

1069

avahi_strerror(avahi_server_errno(mc.server)));

1070

avahi_simple_poll_quit(mc.simple_poll);

1751

1071

return;

1752

1072

1753

1073

case AVAHI_BROWSER_NEW:

1756

1076

the callback function is called the Avahi server will free the

1757

1077

resolver for us. */

1758

1078

1759

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

1760

interface, protocol, name, type,

1761

domain, protocol, 0,

1762

resolve_callback, mc) == NULL)

1079

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

1080

name, type, domain, protocol, 0,

1081

resolve_callback, NULL) == NULL)

1763

1082

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

1764

1083

" %s\n", name,

1765

avahi_strerror(avahi_server_errno

1766

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

1084

avahi_strerror(avahi_server_errno(mc.server)));

1767

1085

break;

1768

1086

1769

1087

case AVAHI_BROWSER_REMOVE:

1788

1106

signal_received = sig;

1789

1107

int old_errno = errno;

1790

1108

/* set main loop to exit */

1791

if(simple_poll != NULL){

1792

avahi_simple_poll_quit(simple_poll);

1109

if(mc.simple_poll != NULL){

1110

avahi_simple_poll_quit(mc.simple_poll);

1793

1111

}

1794

1112

errno = old_errno;

1795

1113

}

1796

1114

1797

__attribute__((nonnull, warn_unused_result))

1798

1115

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

1799

1116

int ret;

1800

int old_errno;

1801

1117

1802

1118

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

1803

1119

if(s < 0){

1804

old_errno = errno;

1805

1120

perror_plus("socket");

1806

errno = old_errno;

1807

1121

return false;

1808

1122

}

1809

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

1810

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

1123

strcpy(ifr->ifr_name, ifname);

1811

1124

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1812

1125

if(ret == -1){

1813

1126

if(debug){

1814

old_errno = errno;

1815

1127

perror_plus("ioctl SIOCGIFFLAGS");

1816

errno = old_errno;

1817

}

1818

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

1819

old_errno = errno;

1820

perror_plus("close");

1821

errno = old_errno;

1822

1128

}

1823

1129

return false;

1824

1130

}

1825

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

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1829

}

1830

1131

return true;

1831

1132

}

1832

1133

1833

__attribute__((nonnull, warn_unused_result))

1834

1134

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

1835

1135

1836

1136

/* Reject the loopback device */

1878

1178

* corresponds to an acceptable network device.

1879

1179

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

1880

1180

*/

1881

__attribute__((nonnull, warn_unused_result))

1882

1181

int good_interface(const struct dirent *if_entry){

1883

1182

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

1884

1183

return 0;

1900

1199

}

1901

1200

1902

1201

/*

1903

* This function determines if a network interface is up.

1904

*/

1905

__attribute__((nonnull, warn_unused_result))

1906

bool interface_is_up(const char *interface){

1907

struct ifreq ifr;

1908

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

1909

if(debug){

1910

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

1911

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

1912

}

1913

return false;

1914

}

1915

1916

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

1917

}

1918

1919

/*

1920

* This function determines if a network interface is running

1921

*/

1922

__attribute__((nonnull, warn_unused_result))

1923

bool interface_is_running(const char *interface){

1924

struct ifreq ifr;

1925

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

1926

if(debug){

1927

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

1928

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

1929

}

1930

return false;

1931

}

1932

1933

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

1934

}

1935

1936

__attribute__((nonnull, pure, warn_unused_result))

1202

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

1203

* corresponds to an acceptable network device which is up.

1204

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

1205

*/

1206

int up_interface(const struct dirent *if_entry){

1207

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

1208

return 0;

1209

}

1210

1211

struct ifreq ifr;

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return 0;

1218

}

1219

1220

/* Reject down interfaces */

1221

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

1222

if(debug){

1223

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

1224

if_entry->d_name);

1225

}

1226

return 0;

1227

}

1228

1229

/* Reject non-running interfaces */

1230

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

1231

if(debug){

1232

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

1233

if_entry->d_name);

1234

}

1235

return 0;

1236

}

1237

1238

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

1239

return 0;

1240

}

1241

return 1;

1242

}

1243

1937

1244

int notdotentries(const struct dirent *direntry){

1938

1245

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

1939

1246

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

1946

1253

}

1947

1254

1948

1255

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

1949

__attribute__((nonnull, warn_unused_result))

1950

1256

int runnable_hook(const struct dirent *direntry){

1951

1257

int ret;

1952

1258

size_t sret;

1960

1266

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

1961

1267

"abcdefghijklmnopqrstuvwxyz"

1962

1268

"0123456789"

1963

"_.-");

1269

"_-");

1964

1270

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

1965

1271

/* Contains non-allowed characters */

1966

1272

if(debug){

1970

1276

return 0;

1971

1277

}

1972

1278

1973

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

1279

char *fullname = NULL;

1280

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

1281

if(ret < 0){

1282

perror_plus("asprintf");

1283

return 0;

1284

}

1285

1286

ret = stat(fullname, &st);

1974

1287

if(ret == -1){

1975

1288

if(debug){

1976

1289

perror_plus("Could not stat hook");

2000

1313

return 1;

2001

1314

}

2002

1315

2003

__attribute__((nonnull, warn_unused_result))

2004

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

2005

mandos_context *mc){

1316

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

2006

1317

int ret;

2007

1318

struct timespec now;

2008

1319

struct timespec waited_time;

2009

1320

intmax_t block_time;

2010

1321

2011

1322

while(true){

2012

if(mc->current_server == NULL){

2013

if(debug){

1323

if(mc.current_server == NULL){

1324

if (debug){

2014

1325

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

2015

1326

" No timeout!\n");

2016

1327

}

2017

1328

ret = avahi_simple_poll_iterate(s, -1);

2018

1329

} else {

2019

if(debug){

1330

if (debug){

2020

1331

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

2021

1332

" it, or wait\n");

2022

1333

}

2029

1340

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

2030

1341

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

2031

1342

waited_time.tv_sec = (now.tv_sec

2032

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

1343

- mc.current_server->last_seen.tv_sec);

2033

1344

waited_time.tv_nsec = (now.tv_nsec

2034

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

1345

- mc.current_server->last_seen.tv_nsec);

2035

1346

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

2036

1347

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

2037

1348

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

2039

1350

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

2040

1351

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

2041

1352

2042

if(debug){

1353

if (debug){

2043

1354

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

2044

1355

block_time);

2045

1356

}

2046

1357

2047

1358

if(block_time <= 0){

2048

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

2049

mc->current_server->port,

2050

mc->current_server->if_index,

2051

mc->current_server->af, mc);

1359

ret = start_mandos_communication(mc.current_server->ip,

1360

mc.current_server->port,

1361

mc.current_server->if_index,

1362

mc.current_server->af);

2052

1363

if(ret == 0){

2053

avahi_simple_poll_quit(s);

1364

avahi_simple_poll_quit(mc.simple_poll);

2054

1365

return 0;

2055

1366

}

2056

1367

ret = clock_gettime(CLOCK_MONOTONIC,

2057

&mc->current_server->last_seen);

1368

&mc.current_server->last_seen);

2058

1369

if(ret == -1){

2059

1370

perror_plus("clock_gettime");

2060

1371

return -1;

2061

1372

}

2062

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

1373

mc.current_server = mc.current_server->next;

2063

1374

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

2064

1375

servers, but don't block */

2065

1376

}

2067

1378

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

2068

1379

}

2069

1380

if(ret != 0){

2070

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

1381

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

2071

1382

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

2072

1383

}

2073

1384

}

2074

1385

}

2075

1386

}

2076

1387

2077

__attribute__((nonnull))

2078

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

1388

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

2079

1389

const float delay){

2080

struct dirent **direntries = NULL;

2081

if(hookdir_fd == -1){

2082

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2083

| O_CLOEXEC);

2084

if(hookdir_fd == -1){

2085

if(errno == ENOENT){

2086

if(debug){

2087

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

2088

" found\n", hookdir);

2089

}

2090

} else {

2091

perror_plus("open");

2092

}

2093

return;

2094

}

2095

}

2096

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

2097

if(devnull == -1){

2098

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

2099

return;

2100

}

2101

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

2102

runnable_hook, alphasort);

1390

struct dirent **direntries;

1391

struct dirent *direntry;

1392

int ret;

1393

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

1394

alphasort);

2103

1395

if(numhooks == -1){

2104

1396

perror_plus("scandir");

2105

close(devnull);

2106

return;

2107

}

2108

struct dirent *direntry;

2109

int ret;

2110

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

2111

direntry = direntries[i];

2112

if(debug){

2113

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

2114

direntry->d_name);

2115

}

2116

pid_t hook_pid = fork();

2117

if(hook_pid == 0){

2118

/* Child */

2119

/* Raise privileges */

2120

errno = raise_privileges_permanently();

2121

if(errno != 0){

2122

perror_plus("Failed to raise privileges");

2123

_exit(EX_NOPERM);

2124

}

2125

/* Set group */

2126

errno = 0;

2127

ret = setgid(0);

2128

if(ret == -1){

2129

perror_plus("setgid");

2130

_exit(EX_NOPERM);

2131

}

2132

/* Reset supplementary groups */

2133

errno = 0;

2134

ret = setgroups(0, NULL);

2135

if(ret == -1){

2136

perror_plus("setgroups");

2137

_exit(EX_NOPERM);

2138

}

2139

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

2140

if(ret == -1){

2141

perror_plus("setenv");

2142

_exit(EX_OSERR);

2143

}

2144

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

2145

if(ret == -1){

2146

perror_plus("setenv");

2147

_exit(EX_OSERR);

2148

}

2149

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

2150

if(ret == -1){

2151

perror_plus("setenv");

2152

_exit(EX_OSERR);

2153

}

2154

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

2155

if(ret == -1){

2156

perror_plus("setenv");

2157

_exit(EX_OSERR);

2158

}

2159

char *delaystring;

2160

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

2161

if(ret == -1){

1397

} else {

1398

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

1399

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

1400

direntry = direntries[i];

1401

char *fullname = NULL;

1402

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

1403

if(ret < 0){

2162

1404

perror_plus("asprintf");

2163

_exit(EX_OSERR);

2164

}

2165

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

2166

if(ret == -1){

1405

continue;

1406

}

1407

if(debug){

1408

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

1409

direntry->d_name);

1410

}

1411

pid_t hook_pid = fork();

1412

if(hook_pid == 0){

1413

/* Child */

1414

/* Raise privileges */

1415

errno = 0;

1416

ret = seteuid(0);

1417

if(ret == -1){

1418

perror_plus("seteuid");

1419

}

1420

/* Raise privileges even more */

1421

errno = 0;

1422

ret = setuid(0);

1423

if(ret == -1){

1424

perror_plus("setuid");

1425

}

1426

/* Set group */

1427

errno = 0;

1428

ret = setgid(0);

1429

if(ret == -1){

1430

perror_plus("setgid");

1431

}

1432

/* Reset supplementary groups */

1433

errno = 0;

1434

ret = setgroups(0, NULL);

1435

if(ret == -1){

1436

perror_plus("setgroups");

1437

}

1438

dup2(devnull, STDIN_FILENO);

1439

close(devnull);

1440

dup2(STDERR_FILENO, STDOUT_FILENO);

1441

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

1442

if(ret == -1){

1443

perror_plus("setenv");

1444

_exit(EX_OSERR);

1445

}

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

char *delaystring;

1462

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

1463

if(ret == -1){

1464

perror_plus("asprintf");

1465

_exit(EX_OSERR);

1466

}

1467

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

1468

if(ret == -1){

1469

free(delaystring);

1470

perror_plus("setenv");

1471

_exit(EX_OSERR);

1472

}

2167

1473

free(delaystring);

2168

perror_plus("setenv");

2169

_exit(EX_OSERR);

2170

}

2171

free(delaystring);

2172

if(connect_to != NULL){

2173

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

2174

if(ret == -1){

2175

perror_plus("setenv");

2176

_exit(EX_OSERR);

2177

}

2178

}

2179

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

2180

direntry->d_name,

2181

O_RDONLY));

2182

if(hook_fd == -1){

2183

perror_plus("openat");

2184

_exit(EXIT_FAILURE);

2185

}

2186

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

2187

perror_plus("close");

2188

_exit(EXIT_FAILURE);

2189

}

2190

ret = dup2(devnull, STDIN_FILENO);

2191

if(ret == -1){

2192

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

2193

_exit(EX_OSERR);

2194

}

2195

ret = close(devnull);

2196

if(ret == -1){

2197

perror_plus("close");

2198

_exit(EX_OSERR);

2199

}

2200

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2201

if(ret == -1){

2202

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

2203

_exit(EX_OSERR);

2204

}

2205

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

2206

environ) == -1){

2207

perror_plus("fexecve");

2208

_exit(EXIT_FAILURE);

2209

}

2210

} else {

2211

if(hook_pid == -1){

2212

perror_plus("fork");

2213

free(direntry);

2214

continue;

2215

}

2216

int status;

2217

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

2218

perror_plus("waitpid");

2219

free(direntry);

2220

continue;

2221

}

2222

if(WIFEXITED(status)){

2223

if(WEXITSTATUS(status) != 0){

2224

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

2225

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

2226

WEXITSTATUS(status));

2227

free(direntry);

2228

continue;

2229

}

2230

} else if(WIFSIGNALED(status)){

2231

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

2232

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

2233

WTERMSIG(status));

2234

free(direntry);

2235

continue;

2236

} else {

2237

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

2238

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

2239

free(direntry);

2240

continue;

2241

}

2242

}

2243

if(debug){

2244

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

2245

direntry->d_name);

2246

}

2247

free(direntry);

2248

}

2249

free(direntries);

2250

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

2251

perror_plus("close");

2252

} else {

2253

hookdir_fd = -1;

2254

}

2255

close(devnull);

2256

}

2257

2258

__attribute__((nonnull, warn_unused_result))

2259

int bring_up_interface(const char *const interface,

2260

const float delay){

2261

int old_errno = errno;

2262

int ret;

2263

struct ifreq network;

2264

unsigned int if_index = if_nametoindex(interface);

2265

if(if_index == 0){

2266

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

2267

errno = old_errno;

2268

return ENXIO;

2269

}

2270

2271

if(quit_now){

2272

errno = old_errno;

2273

return EINTR;

2274

}

2275

2276

if(not interface_is_up(interface)){

2277

int ret_errno = 0;

2278

int ioctl_errno = 0;

2279

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

2280

ret_errno = errno;

2281

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

2282

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

2283

errno = old_errno;

2284

return ret_errno;

2285

}

2286

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

2287

2288

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

2289

if(sd == -1){

2290

ret_errno = errno;

2291

perror_plus("socket");

2292

errno = old_errno;

2293

return ret_errno;

2294

}

2295

2296

if(quit_now){

2297

ret = close(sd);

2298

if(ret == -1){

2299

perror_plus("close");

2300

}

2301

errno = old_errno;

2302

return EINTR;

2303

}

2304

2305

if(debug){

2306

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

2307

interface);

2308

}

2309

2310

/* Raise privileges */

2311

ret_errno = raise_privileges();

2312

if(ret_errno != 0){

2313

errno = ret_errno;

2314

perror_plus("Failed to raise privileges");

2315

}

2316

2317

#ifdef __linux__

2318

int ret_linux;

2319

bool restore_loglevel = false;

2320

if(ret_errno == 0){

2321

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2322

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

2323

ret_linux = klogctl(8, NULL, 5);

2324

if(ret_linux == -1){

2325

perror_plus("klogctl");

2326

} else {

2327

restore_loglevel = true;

2328

}

2329

}

2330

#endif /* __linux__ */

2331

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

2332

ioctl_errno = errno;

2333

#ifdef __linux__

2334

if(restore_loglevel){

2335

ret_linux = klogctl(7, NULL, 0);

2336

if(ret_linux == -1){

2337

perror_plus("klogctl");

2338

}

2339

}

2340

#endif /* __linux__ */

2341

2342

/* If raise_privileges() succeeded above */

2343

if(ret_errno == 0){

2344

/* Lower privileges */

2345

ret_errno = lower_privileges();

2346

if(ret_errno != 0){

2347

errno = ret_errno;

2348

perror_plus("Failed to lower privileges");

2349

}

2350

}

2351

2352

/* Close the socket */

2353

ret = close(sd);

2354

if(ret == -1){

2355

perror_plus("close");

2356

}

2357

2358

if(ret_setflags == -1){

2359

errno = ioctl_errno;

2360

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2361

errno = old_errno;

2362

return ioctl_errno;

2363

}

2364

} else if(debug){

2365

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

2366

interface);

2367

}

2368

2369

/* Sleep checking until interface is running.

2370

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

2371

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

2372

if(interface_is_running(interface)){

2373

break;

2374

}

2375

struct timespec sleeptime = { .tv_nsec = 250000000 };

2376

ret = nanosleep(&sleeptime, NULL);

2377

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

2378

perror_plus("nanosleep");

2379

}

2380

}

2381

2382

errno = old_errno;

2383

return 0;

2384

}

2385

2386

__attribute__((nonnull, warn_unused_result))

2387

int take_down_interface(const char *const interface){

2388

int old_errno = errno;

2389

struct ifreq network;

2390

unsigned int if_index = if_nametoindex(interface);

2391

if(if_index == 0){

2392

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

2393

errno = old_errno;

2394

return ENXIO;

2395

}

2396

if(interface_is_up(interface)){

2397

int ret_errno = 0;

2398

int ioctl_errno = 0;

2399

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

2400

ret_errno = errno;

2401

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

2402

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

2403

errno = old_errno;

2404

return ret_errno;

2405

}

2406

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

2407

2408

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

2409

if(sd == -1){

2410

ret_errno = errno;

2411

perror_plus("socket");

2412

errno = old_errno;

2413

return ret_errno;

2414

}

2415

2416

if(debug){

2417

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

2418

interface);

2419

}

2420

2421

/* Raise privileges */

2422

ret_errno = raise_privileges();

2423

if(ret_errno != 0){

2424

errno = ret_errno;

2425

perror_plus("Failed to raise privileges");

2426

}

2427

2428

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

2429

ioctl_errno = errno;

2430

2431

/* If raise_privileges() succeeded above */

2432

if(ret_errno == 0){

2433

/* Lower privileges */

2434

ret_errno = lower_privileges();

2435

if(ret_errno != 0){

2436

errno = ret_errno;

2437

perror_plus("Failed to lower privileges");

2438

}

2439

}

2440

2441

/* Close the socket */

2442

int ret = close(sd);

2443

if(ret == -1){

2444

perror_plus("close");

2445

}

2446

2447

if(ret_setflags == -1){

2448

errno = ioctl_errno;

2449

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2450

errno = old_errno;

2451

return ioctl_errno;

2452

}

2453

} else if(debug){

2454

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

2455

interface);

2456

}

2457

2458

errno = old_errno;

2459

return 0;

1474

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

1475

perror_plus("execl");

1476

_exit(EXIT_FAILURE);

1477

}

1478

} else {

1479

int status;

1480

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

1481

perror_plus("waitpid");

1482

free(fullname);

1483

continue;

1484

}

1485

if(WIFEXITED(status)){

1486

if(WEXITSTATUS(status) != 0){

1487

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

1488

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

1489

WEXITSTATUS(status));

1490

free(fullname);

1491

continue;

1492

}

1493

} else if(WIFSIGNALED(status)){

1494

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

1495

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

1496

WTERMSIG(status));

1497

free(fullname);

1498

continue;

1499

} else {

1500

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

1501

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

1502

free(fullname);

1503

continue;

1504

}

1505

}

1506

free(fullname);

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

}

1512

close(devnull);

1513

}

1514

return true;

2460

1515

}

2461

1516

2462

1517

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

2463

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

2464

#if GNUTLS_VERSION_NUMBER >= 0x030606

2465

.priority = "SECURE128:!CTYPE-X.509"

2466

":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"

2467

":%PROFILE_ULTRA",

2468

#elif GNUTLS_VERSION_NUMBER < 0x030600

2469

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

2470

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

2471

#else

2472

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

2473

#endif

2474

.current_server = NULL, .interfaces = NULL,

2475

.interfaces_size = 0 };

2476

1518

AvahiSServiceBrowser *sb = NULL;

2477

error_t ret_errno;

1519

int error;

2478

1520

int ret;

2479

1521

intmax_t tmpmax;

2480

1522

char *tmp;

2481

1523

int exitcode = EXIT_SUCCESS;

2482

char *interfaces_to_take_down = NULL;

2483

size_t interfaces_to_take_down_size = 0;

2484

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

2485

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

2486

char *tempdir = NULL;

1524

const char *interface = "";

1525

struct ifreq network;

1526

int sd = -1;

1527

bool take_down_interface = false;

1528

uid_t uid;

1529

gid_t gid;

1530

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

1531

bool tempdir_created = false;

2487

1532

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2488

1533

const char *seckey = PATHDIR "/" SECKEY;

2489

1534

const char *pubkey = PATHDIR "/" PUBKEY;

2490

#if GNUTLS_VERSION_NUMBER >= 0x030606

2491

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2492

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2493

#endif

2494

const char *dh_params_file = NULL;

2495

char *interfaces_hooks = NULL;

2496

1535

2497

1536

bool gnutls_initialized = false;

2498

1537

bool gpgme_initialized = false;

2544

1583

{ .name = "pubkey", .key = 'p',

2545

1584

.arg = "FILE",

2546

1585

.doc = "OpenPGP public key file base name",

2547

.group = 1 },

2548

{ .name = "tls-privkey", .key = 't',

2549

.arg = "FILE",

2550

#if GNUTLS_VERSION_NUMBER >= 0x030606

2551

.doc = "TLS private key file base name",

2552

#else

2553

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2554

#endif

2555

.group = 1 },

2556

{ .name = "tls-pubkey", .key = 'T',

2557

.arg = "FILE",

2558

#if GNUTLS_VERSION_NUMBER >= 0x030606

2559

.doc = "TLS public key file base name",

2560

#else

2561

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2562

#endif

2563

.group = 1 },

1586

.group = 2 },

2564

1587

{ .name = "dh-bits", .key = 129,

2565

1588

.arg = "BITS",

2566

1589

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

2567

1590

" Diffie-Hellman key exchange",

2568

1591

.group = 2 },

2569

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

2570

.arg = "FILE",

2571

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

2572

" for the Diffie-Hellman key exchange",

2573

.group = 2 },

2574

1592

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

2575

1593

.arg = "STRING",

2576

1594

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

2581

1599

.group = 2 },

2582

1600

{ .name = "retry", .key = 132,

2583

1601

.arg = "SECONDS",

2584

.doc = "Retry interval used when denied by the Mandos server",

1602

.doc = "Retry interval used when denied by the mandos server",

2585

1603

.group = 2 },

2586

1604

{ .name = "network-hook-dir", .key = 133,

2587

1605

.arg = "DIR",

2610

1628

connect_to = arg;

2611

1629

break;

2612

1630

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

2613

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

2614

arg, (int)',');

2615

if(ret_errno != 0){

2616

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

2617

}

1631

interface = arg;

2618

1632

break;

2619

1633

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

2620

1634

seckey = arg;

2622

1636

case 'p': /* --pubkey */

2623

1637

pubkey = arg;

2624

1638

break;

2625

case 't': /* --tls-privkey */

2626

#if GNUTLS_VERSION_NUMBER >= 0x030606

2627

tls_privkey = arg;

2628

#endif

2629

break;

2630

case 'T': /* --tls-pubkey */

2631

#if GNUTLS_VERSION_NUMBER >= 0x030606

2632

tls_pubkey = arg;

2633

#endif

2634

break;

2635

1639

case 129: /* --dh-bits */

2636

1640

errno = 0;

2637

1641

tmpmax = strtoimax(arg, &tmp, 10);

2641

1645

}

2642

1646

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

2643

1647

break;

2644

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

2645

dh_params_file = arg;

2646

break;

2647

1648

case 130: /* --priority */

2648

1649

mc.priority = arg;

2649

1650

break;

2672

1673

argp_state_help(state, state->out_stream,

2673

1674

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

2674

1675

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2675

__builtin_unreachable();

2676

1676

case -3: /* --usage */

2677

1677

argp_state_help(state, state->out_stream,

2678

1678

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2679

__builtin_unreachable();

2680

1679

case 'V': /* --version */

2681

1680

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

2682

1681

exit(argp_err_exit_status);

2691

1690

.args_doc = "",

2692

1691

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

2693

1692

" passwords from a Mandos server" };

2694

ret_errno = argp_parse(&argp, argc, argv,

2695

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2696

switch(ret_errno){

1693

ret = argp_parse(&argp, argc, argv,

1694

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1695

switch(ret){

2697

1696

case 0:

2698

1697

break;

2699

1698

case ENOMEM:

2700

1699

default:

2701

errno = ret_errno;

1700

errno = ret;

2702

1701

perror_plus("argp_parse");

2703

1702

exitcode = EX_OSERR;

2704

1703

goto end;

2707

1706

goto end;

2708

1707

}

2709

1708

}

2710

1709

2711

1710

{

2712

1711

/* Work around Debian bug #633582:

2713

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

1712

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

2714

1713

2715

/* Re-raise privileges */

2716

ret = raise_privileges();

2717

if(ret != 0){

2718

errno = ret;

2719

perror_plus("Failed to raise privileges");

1714

/* Re-raise priviliges */

1715

errno = 0;

1716

ret = seteuid(0);

1717

if(ret == -1){

1718

perror_plus("seteuid");

2720

1719

} else {

2721

1720

struct stat st;

2722

1721

2737

1736

}

2738

1737

}

2739

1738

}

2740

close(seckey_fd);

1739

TEMP_FAILURE_RETRY(close(seckey_fd));

2741

1740

}

2742

1741

}

2743

1742

2744

1743

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

2745

1744

int pubkey_fd = open(pubkey, O_RDONLY);

2746

1745

if(pubkey_fd == -1){

2758

1757

}

2759

1758

}

2760

1759

}

2761

close(pubkey_fd);

2762

}

2763

}

2764

2765

if(dh_params_file != NULL

2766

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

2767

int dhparams_fd = open(dh_params_file, O_RDONLY);

2768

if(dhparams_fd == -1){

2769

perror_plus("open");

2770

} else {

2771

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

2772

if(ret == -1){

2773

perror_plus("fstat");

2774

} else {

2775

if(S_ISREG(st.st_mode)

2776

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

2777

ret = fchown(dhparams_fd, uid, gid);

2778

if(ret == -1){

2779

perror_plus("fchown");

2780

}

2781

}

2782

}

2783

close(dhparams_fd);

2784

}

2785

}

2786

1760

TEMP_FAILURE_RETRY(close(pubkey_fd));

1761

}

1762

}

1763

2787

1764

/* Lower privileges */

2788

ret = lower_privileges();

2789

if(ret != 0){

2790

errno = ret;

2791

perror_plus("Failed to lower privileges");

2792

}

2793

}

2794

}

2795

2796

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

2797

{

2798

char *interface = NULL;

2799

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

2800

interface))){

2801

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

2802

and if_nametoindex(interface) == 0){

2803

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

2804

fprintf_plus(stderr, "Not using nonexisting interface"

2805

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

2806

}

2807

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

2808

interface = NULL;

1765

errno = 0;

1766

ret = seteuid(uid);

1767

if(ret == -1){

1768

perror_plus("seteuid");

2809

1769

}

2810

1770

}

2811

1771

}

2812

1772

2813

1773

/* Run network hooks */

2814

{

2815

if(mc.interfaces != NULL){

2816

interfaces_hooks = malloc(mc.interfaces_size);

2817

if(interfaces_hooks == NULL){

2818

perror_plus("malloc");

2819

goto end;

2820

}

2821

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

2822

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

2823

}

2824

run_network_hooks("start", interfaces_hooks != NULL ?

2825

interfaces_hooks : "", delay);

1774

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

1775

goto end;

2826

1776

}

2827

1777

2828

1778

if(not debug){

2829

1779

avahi_set_log_function(empty_log);

2830

1780

}

2831

1781

1782

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

1783

struct dirent **direntries;

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1786

alphasort);

1787

if(ret == 0){

1788

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

1789

free(direntries);

1790

ret = scandir(sys_class_net, &direntries, good_interface,

1791

alphasort);

1792

}

1793

if(ret >= 1){

1794

/* Pick the first interface returned */

1795

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

1796

if(debug){

1797

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

1798

}

1799

if(interface == NULL){

1800

perror_plus("malloc");

1801

free(direntries);

1802

exitcode = EXIT_FAILURE;

1803

goto end;

1804

}

1805

free(direntries);

1806

} else {

1807

free(direntries);

1808

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

1809

exitcode = EXIT_FAILURE;

1810

goto end;

1811

}

1812

}

1813

2832

1814

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

2833

1815

from the signal handler */

2834

1816

/* Initialize the pseudo-RNG for Avahi */

2835

1817

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

2836

simple_poll = avahi_simple_poll_new();

2837

if(simple_poll == NULL){

1818

mc.simple_poll = avahi_simple_poll_new();

1819

if(mc.simple_poll == NULL){

2838

1820

fprintf_plus(stderr,

2839

1821

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

2840

1822

exitcode = EX_UNAVAILABLE;

2904

1886

}

2905

1887

}

2906

1888

2907

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

2908

if(mc.interfaces == NULL){

2909

struct dirent **direntries = NULL;

2910

/* Look for any good interfaces */

2911

ret = scandir(sys_class_net, &direntries, good_interface,

2912

alphasort);

2913

if(ret >= 1){

2914

/* Add all found interfaces to interfaces list */

2915

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

2916

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

2917

direntries[i]->d_name);

2918

if(ret_errno != 0){

2919

errno = ret_errno;

2920

perror_plus("argz_add");

2921

free(direntries[i]);

2922

continue;

2923

}

2924

if(debug){

2925

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

2926

direntries[i]->d_name);

2927

}

2928

free(direntries[i]);

2929

}

2930

free(direntries);

2931

} else {

2932

if(ret == 0){

2933

free(direntries);

2934

}

2935

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

2936

exitcode = EXIT_FAILURE;

2937

goto end;

2938

}

2939

}

2940

2941

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

2942

{

2943

char *interface = NULL;

2944

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

2945

interface))){

2946

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

2947

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

2948

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

2949

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

2950

interface);

2951

interface = NULL;

2952

while((interface = argz_next(mc.interfaces,

2953

mc.interfaces_size, interface))){

2954

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

2955

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

2956

interface);

2957

interface = NULL;

1889

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

1890

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

1891

if_index = (AvahiIfIndex) if_nametoindex(interface);

1892

if(if_index == 0){

1893

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

1894

exitcode = EX_UNAVAILABLE;

1895

goto end;

1896

}

1897

1898

if(quit_now){

1899

goto end;

1900

}

1901

1902

/* Re-raise priviliges */

1903

errno = 0;

1904

ret = seteuid(0);

1905

if(ret == -1){

1906

perror_plus("seteuid");

1907

}

1908

1909

#ifdef __linux__

1910

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1911

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

1912

ret = klogctl(8, NULL, 5);

1913

bool restore_loglevel = true;

1914

if(ret == -1){

1915

restore_loglevel = false;

1916

perror_plus("klogctl");

1917

}

1918

#endif /* __linux__ */

1919

1920

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1921

if(sd < 0){

1922

perror_plus("socket");

1923

exitcode = EX_OSERR;

1924

#ifdef __linux__

1925

if(restore_loglevel){

1926

ret = klogctl(7, NULL, 0);

1927

if(ret == -1){

1928

perror_plus("klogctl");

1929

}

1930

}

1931

#endif /* __linux__ */

1932

/* Lower privileges */

1933

errno = 0;

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

goto end;

1939

}

1940

strcpy(network.ifr_name, interface);

1941

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

1942

if(ret == -1){

1943

perror_plus("ioctl SIOCGIFFLAGS");

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

1949

}

1950

}

1951

#endif /* __linux__ */

1952

exitcode = EX_OSERR;

1953

/* Lower privileges */

1954

errno = 0;

1955

ret = seteuid(uid);

1956

if(ret == -1){

1957

perror_plus("seteuid");

1958

}

1959

goto end;

1960

}

1961

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

1962

network.ifr_flags |= IFF_UP;

1963

take_down_interface = true;

1964

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

1965

if(ret == -1){

1966

take_down_interface = false;

1967

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1968

exitcode = EX_OSERR;

1969

#ifdef __linux__

1970

if(restore_loglevel){

1971

ret = klogctl(7, NULL, 0);

1972

if(ret == -1){

1973

perror_plus("klogctl");

2958

1974

}

2959

1975

}

1976

#endif /* __linux__ */

1977

/* Lower privileges */

1978

errno = 0;

1979

ret = seteuid(uid);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

goto end;

1984

}

1985

}

1986

/* Sleep checking until interface is running.

1987

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

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCGIFFLAGS");

1992

} else if(network.ifr_flags & IFF_RUNNING){

2960

1993

break;

2961

1994

}

2962

bool interface_was_up = interface_is_up(interface);

2963

errno = bring_up_interface(interface, delay);

2964

if(not interface_was_up){

2965

if(errno != 0){

2966

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

2967

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

2968

} else {

2969

errno = argz_add(&interfaces_to_take_down,

2970

&interfaces_to_take_down_size,

2971

interface);

2972

if(errno != 0){

2973

perror_plus("argz_add");

2974

}

2975

}

2976

}

2977

}

2978

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

2979

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

2980

}

2981

}

2982

2983

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

2984

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

2985

if(debug){

2986

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

2987

mc.interfaces);

2988

}

2989

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

1995

struct timespec sleeptime = { .tv_nsec = 250000000 };

1996

ret = nanosleep(&sleeptime, NULL);

1997

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

1998

perror_plus("nanosleep");

1999

}

2000

}

2001

if(not take_down_interface){

2002

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

2003

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

2004

if(ret == -1){

2005

perror_plus("close");

2006

}

2007

}

2008

#ifdef __linux__

2009

if(restore_loglevel){

2010

/* Restores kernel loglevel to default */

2011

ret = klogctl(7, NULL, 0);

2012

if(ret == -1){

2013

perror_plus("klogctl");

2014

}

2015

}

2016

#endif /* __linux__ */

2017

/* Lower privileges */

2018

errno = 0;

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

2023

}

2990

2024

}

2991

2025

2992

2026

if(quit_now){

2993

2027

goto end;

2994

2028

}

2995

2029

2996

#if GNUTLS_VERSION_NUMBER >= 0x030606

2997

ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);

2998

#elif GNUTLS_VERSION_NUMBER < 0x030600

2999

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

3000

#else

3001

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

3002

#endif

2030

ret = init_gnutls_global(pubkey, seckey);

3003

2031

if(ret == -1){

3004

2032

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

3005

2033

exitcode = EX_UNAVAILABLE;

3012

2040

goto end;

3013

2041

}

3014

2042

3015

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

3016

tempdir = mkdtemp(run_tempdir);

3017

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

3018

if(debug){

3019

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

3020

run_tempdir, old_tempdir);

3021

}

3022

tempdir = mkdtemp(old_tempdir);

3023

}

3024

if(tempdir == NULL){

2043

if(mkdtemp(tempdir) == NULL){

3025

2044

perror_plus("mkdtemp");

3026

2045

goto end;

3027

2046

}

2047

tempdir_created = true;

3028

2048

3029

2049

if(quit_now){

3030

2050

goto end;

3031

2051

}

3032

2052

3033

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

2053

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

3034

2054

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

3035

2055

exitcode = EX_UNAVAILABLE;

3036

2056

goto end;

3046

2066

/* Connect directly, do not use Zeroconf */

3047

2067

/* (Mainly meant for debugging) */

3048

2068

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

3049

3050

2069

if(address == NULL){

3051

2070

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

3052

2071

exitcode = EX_USAGE;

3057

2076

goto end;

3058

2077

}

3059

2078

3060

in_port_t port;

2079

uint16_t port;

3061

2080

errno = 0;

3062

2081

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

3063

2082

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

3064

or tmpmax != (in_port_t)tmpmax){

2083

or tmpmax != (uint16_t)tmpmax){

3065

2084

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

3066

2085

exitcode = EX_USAGE;

3067

2086

goto end;

3068

2087

}

3069

2088

3070

2089

if(quit_now){

3071

2090

goto end;

3072

2091

}

3073

2092

3074

port = (in_port_t)tmpmax;

2093

port = (uint16_t)tmpmax;

3075

2094

*address = '\0';

3076

2095

/* Colon in address indicates IPv6 */

3077

2096

int af;

3093

2112

}

3094

2113

3095

2114

while(not quit_now){

3096

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

3097

&mc);

2115

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

3098

2116

if(quit_now or ret == 0){

3099

2117

break;

3100

2118

}

3102

2120

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

3103

2121

(int)retry_interval);

3104

2122

}

3105

sleep((unsigned int)retry_interval);

2123

sleep((int)retry_interval);

3106

2124

}

3107

2125

3108

if(not quit_now){

2126

if (not quit_now){

3109

2127

exitcode = EXIT_SUCCESS;

3110

2128

}

3111

2129

3126

2144

config.publish_domain = 0;

3127

2145

3128

2146

/* Allocate a new server */

3129

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3130

&config, NULL, NULL, &ret);

2147

mc.server = avahi_server_new(avahi_simple_poll_get

2148

(mc.simple_poll), &config, NULL,

2149

NULL, &error);

3131

2150

3132

2151

/* Free the Avahi configuration data */

3133

2152

avahi_server_config_free(&config);

3136

2155

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

3137

2156

if(mc.server == NULL){

3138

2157

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

3139

avahi_strerror(ret));

2158

avahi_strerror(error));

3140

2159

exitcode = EX_UNAVAILABLE;

3141

2160

goto end;

3142

2161

}

3148

2167

/* Create the Avahi service browser */

3149

2168

sb = avahi_s_service_browser_new(mc.server, if_index,

3150

2169

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

3151

NULL, 0, browse_callback,

3152

(void *)&mc);

2170

NULL, 0, browse_callback, NULL);

3153

2171

if(sb == NULL){

3154

2172

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

3155

2173

avahi_strerror(avahi_server_errno(mc.server)));

3166

2184

if(debug){

3167

2185

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

3168

2186

}

3169

3170

ret = avahi_loop_with_timeout(simple_poll,

3171

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

2187

2188

ret = avahi_loop_with_timeout(mc.simple_poll,

2189

(int)(retry_interval * 1000));

3172

2190

if(debug){

3173

2191

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

3174

2192

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

3177

2195

end:

3178

2196

3179

2197

if(debug){

3180

if(signal_received){

3181

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

3182

argv[0], signal_received,

3183

strsignal(signal_received));

3184

} else {

3185

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

3186

}

2198

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

3187

2199

}

3188

2200

3189

2201

/* Cleanup things */

3190

free(mc.interfaces);

3191

3192

2202

if(sb != NULL)

3193

2203

avahi_s_service_browser_free(sb);

3194

2204

3195

2205

if(mc.server != NULL)

3196

2206

avahi_server_free(mc.server);

3197

2207

3198

if(simple_poll != NULL)

3199

avahi_simple_poll_free(simple_poll);

2208

if(mc.simple_poll != NULL)

2209

avahi_simple_poll_free(mc.simple_poll);

3200

2210

3201

2211

if(gnutls_initialized){

3202

2212

gnutls_certificate_free_credentials(mc.cred);

2213

gnutls_global_deinit();

3203

2214

gnutls_dh_params_deinit(mc.dh_params);

3204

2215

}

3205

2216

3213

2224

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

3214

2225

while(mc.current_server != NULL){

3215

2226

server *next = mc.current_server->next;

3216

#ifdef __GNUC__

3217

#pragma GCC diagnostic push

3218

#pragma GCC diagnostic ignored "-Wcast-qual"

3219

#endif

3220

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

3221

#ifdef __GNUC__

3222

#pragma GCC diagnostic pop

3223

#endif

3224

2227

free(mc.current_server);

3225

2228

mc.current_server = next;

3226

2229

}

3227

2230

}

3228

2231

3229

/* Re-raise privileges */

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

3230

2236

{

3231

ret = raise_privileges();

3232

if(ret != 0){

3233

errno = ret;

3234

perror_plus("Failed to raise privileges");

3235

} else {

3236

3237

/* Run network hooks */

3238

run_network_hooks("stop", interfaces_hooks != NULL ?

3239

interfaces_hooks : "", delay);

3240

3241

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

3242

{

3243

char *interface = NULL;

3244

while((interface = argz_next(interfaces_to_take_down,

3245

interfaces_to_take_down_size,

3246

interface))){

3247

ret = take_down_interface(interface);

3248

if(ret != 0){

3249

errno = ret;

3250

perror_plus("Failed to take down interface");

3251

}

3252

}

3253

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

3254

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

3255

" down\n");

3256

}

3257

}

2237

errno = 0;

2238

ret = seteuid(0);

2239

if(ret == -1){

2240

perror_plus("seteuid");

3258

2241

}

3259

2242

3260

ret = lower_privileges_permanently();

3261

if(ret != 0){

3262

errno = ret;

3263

perror_plus("Failed to lower privileges permanently");

2243

/* Take down the network interface */

2244

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

2245

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

2246

if(ret == -1){

2247

perror_plus("ioctl SIOCGIFFLAGS");

2248

} else if(network.ifr_flags & IFF_UP){

2249

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

2250

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

2251

if(ret == -1){

2252

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2253

}

2254

}

2255

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

2256

if(ret == -1){

2257

perror_plus("close");

2258

}

3264

2259

}

3265

2260

}

3266

3267

free(interfaces_to_take_down);

3268

free(interfaces_hooks);

3269

3270

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

3271

uintmax_t level){

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

2267

2268

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

2269

if(tempdir_created){

3272

2270

struct dirent **direntries = NULL;

3273

int dret;

3274

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

3275

O_RDONLY

3276

| O_NOFOLLOW

3277

| O_DIRECTORY

3278

| O_PATH));

3279

if(dir_fd == -1){

3280

perror_plus("open");

3281

return;

3282

}

3283

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

3284

notdotentries, alphasort);

3285

if(numentries >= 0){

2271

struct dirent *direntry = NULL;

2272

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

2273

alphasort);

2274

if (numentries > 0){

3286

2275

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

3287

if(debug){

3288

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

3289

dirname, direntries[i]->d_name);

3290

}

3291

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

3292

if(dret == -1){

3293

if(errno == EISDIR){

3294

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

3295

AT_REMOVEDIR);

3296

}

3297

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

3298

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

3299

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

3300

/* Recurse only in this special case */

3301

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

3302

dret = 0;

3303

}

3304

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

3305

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

3306

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

3307

}

3308

}

3309

free(direntries[i]);

3310

}

3311

3312

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

3313

free(direntries);

3314

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3315

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

3316

perror_plus("rmdir");

3317

}

3318

} else {

3319

perror_plus("scandirat");

3320

}

3321

close(dir_fd);

3322

}

3323

3324

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

3325

if(tempdir != NULL){

3326

clean_dir_at(-1, tempdir, 0);

2276

direntry = direntries[i];

2277

char *fullname = NULL;

2278

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

2279

direntry->d_name);

2280

if(ret < 0){

2281

perror_plus("asprintf");

2282

continue;

2283

}

2284

ret = remove(fullname);

2285

if(ret == -1){

2286

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

2287

strerror(errno));

2288

}

2289

free(fullname);

2290

}

2291

}

2292

2293

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

2294

free(direntries);

2295

if (numentries == -1){

2296

perror_plus("scandir");

2297

}

2298

ret = rmdir(tempdir);

2299

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

2300

perror_plus("rmdir");

2301

}

3327

2302

}

3328

2303

3329

2304

if(quit_now){