/mandos/release : revision 237.16.11

26

* along with this program. If not, see

27

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

28

*

29

* Contact the authors at <mandos@fukt.bsnet.se>.

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

65

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

66

program_invocation_short_name */

66

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

73

74

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

74

75

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

75

76

setgid(), pause() */

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

84

85

raise() */

85

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

87

90

88

91

#ifdef __linux__

89

92

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

107

110

init_gnutls_session(),

108

111

GNUTLS_* */

109

112

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

112

115

113

116

/* GPGME */

114

117

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

122

125

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

123

126

#define SECKEY "seckey.txt"

124

127

#define PUBKEY "pubkey.txt"

128

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

125

129

126

130

bool debug = false;

127

131

static const char mandos_protocol_version[] = "1";

128

132

const char *argp_program_version = "mandos-client " VERSION;

129

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

133

const char *argp_program_bug_address = "<mandos@recompile.se>";

130

134

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

131

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

132

148

133

149

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

134

150

typedef struct {

139

155

gnutls_dh_params_t dh_params;

140

156

const char *priority;

141

157

gpgme_ctx_t ctx;

158

server *current_server;

142

159

} mandos_context;

143

160

144

161

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

145

162

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

146

163

.dh_bits = 1024, .priority = "SECURE256"

147

":!CTYPE-X.509:+CTYPE-OPENPGP" };

164

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

165

.current_server = NULL };

148

166

149

167

sig_atomic_t quit_now = 0;

150

168

int signal_received = 0;

151

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

174

perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

152

186

/*

153

187

* Make additional room in "buffer" for at least BUFFER_SIZE more

154

188

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

155

189

* "buffer_length" is how much is already used.

156

190

*/

157

191

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

192

size_t buffer_capacity){

159

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

194

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

161

195

if(buffer == NULL){

166

200

return buffer_capacity;

167

201

}

168

202

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

*new_server = (server){ .ip = strdup(ip),

213

.port = port,

214

.if_index = if_index,

215

.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

223

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

226

} else {

227

new_server->next = mc.current_server;

228

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

169

240

/*

170

241

* Initialize GPGME.

171

242

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

243

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

244

const char *tempdir){

174

245

gpgme_error_t rc;

175

246

gpgme_engine_info_t engine_info;

176

247

185

256

186

257

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

187

258

if(fd == -1){

188

perror("open");

259

perror_plus("open");

189

260

return false;

190

261

}

191

262

192

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

264

if(rc != GPG_ERR_NO_ERROR){

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

196

267

return false;

197

268

}

198

269

199

270

rc = gpgme_op_import(mc.ctx, pgp_data);

200

271

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

203

274

return false;

204

275

}

205

276

206

277

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

207

278

if(ret == -1){

208

perror("close");

279

perror_plus("close");

209

280

}

210

281

gpgme_data_release(pgp_data);

211

282

return true;

212

283

}

213

284

214

285

if(debug){

215

fprintf(stderr, "Initializing GPGME\n");

286

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

216

287

}

217

288

218

289

/* Init GPGME */

219

290

gpgme_check_version(NULL);

220

291

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

292

if(rc != GPG_ERR_NO_ERROR){

222

fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",

223

gpgme_strsource(rc), gpgme_strerror(rc));

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

224

295

return false;

225

296

}

226

297

227

/* Set GPGME home directory for the OpenPGP engine only */

298

/* Set GPGME home directory for the OpenPGP engine only */

228

299

rc = gpgme_get_engine_info(&engine_info);

229

300

if(rc != GPG_ERR_NO_ERROR){

230

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

231

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

232

303

return false;

233

304

}

234

305

while(engine_info != NULL){

240

311

engine_info = engine_info->next;

241

312

}

242

313

if(engine_info == NULL){

243

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

314

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

315

tempdir);

244

316

return false;

245

317

}

246

318

247

319

/* Create new GPGME "context" */

248

320

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

249

321

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

322

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

323

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

324

gpgme_strerror(rc));

252

325

return false;

253

326

}

254

327

273

346

ssize_t plaintext_length = 0;

274

347

275

348

if(debug){

276

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

349

fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");

277

350

}

278

351

279

352

/* Create new GPGME data buffer from memory cryptotext */

280

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

354

0);

282

355

if(rc != GPG_ERR_NO_ERROR){

283

fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

284

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

285

358

return -1;

286

359

}

287

360

288

361

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

289

362

rc = gpgme_data_new(&dh_plain);

290

363

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

293

367

gpgme_data_release(dh_crypto);

294

368

return -1;

295

369

}

298

372

data buffer */

299

373

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

300

374

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

303

377

plaintext_length = -1;

304

378

if(debug){

305

379

gpgme_decrypt_result_t result;

306

380

result = gpgme_op_decrypt_result(mc.ctx);

307

381

if(result == NULL){

308

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

382

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

309

383

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

314

388

if(result->file_name != NULL){

315

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

389

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

316

390

}

317

391

gpgme_recipient_t recipient;

318

392

recipient = result->recipients;

319

393

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

326

401

recipient = recipient->next;

327

402

}

328

403

}

331

406

}

332

407

333

408

if(debug){

334

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

409

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

335

410

}

336

411

337

412

/* Seek back to the beginning of the GPGME plaintext data buffer */

338

413

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

339

perror("gpgme_data_seek");

414

perror_plus("gpgme_data_seek");

340

415

plaintext_length = -1;

341

416

goto decrypt_end;

342

417

}

344

419

*plaintext = NULL;

345

420

while(true){

346

421

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

349

424

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

353

428

}

354

429

355

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

435

break;

361

436

}

362

437

if(ret < 0){

363

perror("gpgme_data_read");

438

perror_plus("gpgme_data_read");

364

439

plaintext_length = -1;

365

440

goto decrypt_end;

366

441

}

368

443

}

369

444

370

445

if(debug){

371

fprintf(stderr, "Decrypted password is: ");

446

fprintf_plus(stderr, "Decrypted password is: ");

372

447

for(ssize_t i = 0; i < plaintext_length; i++){

373

448

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

374

449

}

396

471

/* GnuTLS log function callback */

397

472

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

398

473

const char* string){

399

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

474

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

400

475

}

401

476

402

477

static int init_gnutls_global(const char *pubkeyfilename,

404

479

int ret;

405

480

406

481

if(debug){

407

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

482

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

408

483

}

409

484

410

485

ret = gnutls_global_init();

411

486

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

414

489

return -1;

415

490

}

416

491

423

498

}

424

499

425

500

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

502

if(ret != GNUTLS_E_SUCCESS){

428

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

503

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

504

safer_gnutls_strerror(ret));

433

505

gnutls_global_deinit();

434

506

return -1;

435

507

}

436

508

437

509

if(debug){

438

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

439

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

440

seckeyfilename);

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

441

514

}

442

515

443

516

ret = gnutls_certificate_set_openpgp_key_file

444

517

(mc.cred, pubkeyfilename, seckeyfilename,

445

518

GNUTLS_OPENPGP_FMT_BASE64);

446

519

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

452

525

goto globalfail;

453

526

}

454

527

455

528

/* GnuTLS server initialization */

456

529

ret = gnutls_dh_params_init(&mc.dh_params);

457

530

if(ret != GNUTLS_E_SUCCESS){

458

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

459

" %s\n", safer_gnutls_strerror(ret));

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

460

534

goto globalfail;

461

535

}

462

536

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

463

537

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

466

540

goto globalfail;

467

541

}

468

542

488

562

}

489

563

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

490

564

if(ret != GNUTLS_E_SUCCESS){

491

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

492

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

"Error in GnuTLS session initialization: %s\n",

567

safer_gnutls_strerror(ret));

493

568

}

494

569

495

570

{

502

577

}

503

578

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

504

579

if(ret != GNUTLS_E_SUCCESS){

505

fprintf(stderr, "Syntax error at: %s\n", err);

506

fprintf(stderr, "GnuTLS error: %s\n",

507

safer_gnutls_strerror(ret));

580

fprintf_plus(stderr, "Syntax error at: %s\n", err);

581

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

582

safer_gnutls_strerror(ret));

508

583

gnutls_deinit(*session);

509

584

return -1;

510

585

}

519

594

}

520

595

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

521

596

if(ret != GNUTLS_E_SUCCESS){

522

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

523

safer_gnutls_strerror(ret));

597

fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",

598

safer_gnutls_strerror(ret));

524

599

gnutls_deinit(*session);

525

600

return -1;

526

601

}

571

646

pf = PF_INET;

572

647

break;

573

648

default:

574

fprintf(stderr, "Bad address family: %d\n", af);

649

fprintf_plus(stderr, "Bad address family: %d\n", af);

575

650

errno = EINVAL;

576

651

return -1;

577

652

}

582

657

}

583

658

584

659

if(debug){

585

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

586

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

587

662

}

588

663

589

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

665

if(tcp_sd < 0){

591

666

int e = errno;

592

perror("socket");

667

perror_plus("socket");

593

668

errno = e;

594

669

goto mandos_end;

595

670

}

609

684

}

610

685

if(ret < 0 ){

611

686

int e = errno;

612

perror("inet_pton");

687

perror_plus("inet_pton");

613

688

errno = e;

614

689

goto mandos_end;

615

690

}

616

691

if(ret == 0){

617

692

int e = errno;

618

fprintf(stderr, "Bad address: %s\n", ip);

693

fprintf_plus(stderr, "Bad address: %s\n", ip);

619

694

errno = e;

620

695

goto mandos_end;

621

696

}

626

701

627

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

703

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

629

-Wunreachable-code*/

704

-Wunreachable-code*/

630

705

if(if_index == AVAHI_IF_UNSPEC){

631

fprintf(stderr, "An IPv6 link-local address is incomplete"

632

" without a network interface\n");

706

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

707

" incomplete without a network interface\n");

633

708

errno = EINVAL;

634

709

goto mandos_end;

635

710

}

651

726

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

652

727

char interface[IF_NAMESIZE];

653

728

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

654

perror("if_indextoname");

729

perror_plus("if_indextoname");

655

730

} else {

656

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

657

ip, interface, port);

731

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

732

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

658

733

}

659

734

} else {

660

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

661

port);

735

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

736

ip, port);

662

737

}

663

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

746

sizeof(addrstr));

672

747

}

673

748

if(pcret == NULL){

674

perror("inet_ntop");

749

perror_plus("inet_ntop");

675

750

} else {

676

751

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

677

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

752

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

678

753

}

679

754

}

680

755

}

692

767

if(ret < 0){

693

768

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

694

769

int e = errno;

695

perror("connect");

770

perror_plus("connect");

696

771

errno = e;

697

772

}

698

773

goto mandos_end;

708

783

while(true){

709

784

size_t out_size = strlen(out);

710

785

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

711

out_size - written));

786

out_size - written));

712

787

if(ret == -1){

713

788

int e = errno;

714

perror("write");

789

perror_plus("write");

715

790

errno = e;

716

791

goto mandos_end;

717

792

}

734

809

}

735

810

736

811

if(debug){

737

fprintf(stderr, "Establishing TLS session with %s\n", ip);

812

fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);

738

813

}

739

814

740

815

if(quit_now){

741

816

errno = EINTR;

742

817

goto mandos_end;

743

818

}

744

745

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

819

820

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

746

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

747

822

748

823

if(quit_now){

760

835

761

836

if(ret != GNUTLS_E_SUCCESS){

762

837

if(debug){

763

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

838

fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");

764

839

gnutls_perror(ret);

765

840

}

766

841

errno = EPROTO;

770

845

/* Read OpenPGP packet that contains the wanted password */

771

846

772

847

if(debug){

773

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

774

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

775

850

}

776

851

777

852

while(true){

782

857

}

783

858

784

859

buffer_capacity = incbuffer(&buffer, buffer_length,

785

buffer_capacity);

860

buffer_capacity);

786

861

if(buffer_capacity == 0){

787

862

int e = errno;

788

perror("incbuffer");

863

perror_plus("incbuffer");

789

864

errno = e;

790

865

goto mandos_end;

791

866

}

815

890

}

816

891

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

817

892

if(ret < 0){

818

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

893

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

894

"***\n");

819

895

gnutls_perror(ret);

820

896

errno = EPROTO;

821

897

goto mandos_end;

822

898

}

823

899

break;

824

900

default:

825

fprintf(stderr, "Unknown error while reading data from"

826

" encrypted session with Mandos server\n");

901

fprintf_plus(stderr, "Unknown error while reading data from"

902

" encrypted session with Mandos server\n");

827

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

828

904

errno = EIO;

829

905

goto mandos_end;

834

910

}

835

911

836

912

if(debug){

837

fprintf(stderr, "Closing TLS session\n");

913

fprintf_plus(stderr, "Closing TLS session\n");

838

914

}

839

915

840

916

if(quit_now){

852

928

853

929

if(buffer_length > 0){

854

930

ssize_t decrypted_buffer_size;

855

decrypted_buffer_size = pgp_packet_decrypt(buffer,

856

buffer_length,

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

857

932

&decrypted_buffer);

858

933

if(decrypted_buffer_size >= 0){

859

934

870

945

if(ret == 0 and ferror(stdout)){

871

946

int e = errno;

872

947

if(debug){

873

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

874

strerror(errno));

948

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

949

strerror(errno));

875

950

}

876

951

errno = e;

877

952

goto mandos_end;

896

971

if(e == 0){

897

972

e = errno;

898

973

}

899

perror("close");

974

perror_plus("close");

900

975

}

901

976

gnutls_deinit(session);

977

errno = e;

902

978

if(quit_now){

903

e = EINTR;

979

errno = EINTR;

904

980

retval = -1;

905

981

}

906

errno = e;

907

982

}

908

983

return retval;

909

984

}

934

1009

switch(event){

935

1010

default:

936

1011

case AVAHI_RESOLVER_FAILURE:

937

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

938

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

939

avahi_strerror(avahi_server_errno(mc.server)));

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

940

1016

break;

941

1017

942

1018

case AVAHI_RESOLVER_FOUND:

944

1020

char ip[AVAHI_ADDRESS_STR_MAX];

945

1021

avahi_address_snprint(ip, sizeof(ip), address);

946

1022

if(debug){

947

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

948

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

949

ip, (intmax_t)interface, port);

1023

fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"

1024

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

1025

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

950

1026

}

951

1027

int ret = start_mandos_communication(ip, port, interface,

952

1028

avahi_proto_to_af(proto));

953

1029

if(ret == 0){

954

1030

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

955

1034

}

956

1035

}

957

1036

}

981

1060

default:

982

1061

case AVAHI_BROWSER_FAILURE:

983

1062

984

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

985

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

986

1065

avahi_simple_poll_quit(mc.simple_poll);

987

1066

return;

988

1067

995

1074

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

996

1075

name, type, domain, protocol, 0,

997

1076

resolve_callback, NULL) == NULL)

998

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

999

name, avahi_strerror(avahi_server_errno(mc.server)));

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1000

1080

break;

1001

1081

1002

1082

case AVAHI_BROWSER_REMOVE:

1005

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

1006

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1007

1087

if(debug){

1008

fprintf(stderr, "No Mandos server found, still searching...\n");

1088

fprintf_plus(stderr, "No Mandos server found, still"

1089

" searching...\n");

1009

1090

}

1010

1091

break;

1011

1092

}

1012

1093

}

1013

1094

1014

/* stop main loop after sigterm has been called */

1095

/* Signal handler that stops main loop after SIGTERM */

1015

1096

static void handle_sigterm(int sig){

1016

1097

if(quit_now){

1017

1098

return;

1019

1100

quit_now = 1;

1020

1101

signal_received = sig;

1021

1102

int old_errno = errno;

1103

/* set main loop to exit */

1022

1104

if(mc.simple_poll != NULL){

1023

1105

avahi_simple_poll_quit(mc.simple_poll);

1024

1106

}

1025

1107

errno = old_errno;

1026

1108

}

1027

1109

1028

/*

1029

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

1030

* corresponds to an acceptable network device.

1031

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

1032

*/

1033

int good_interface(const struct dirent *if_entry){

1034

ssize_t ssret;

1035

char *flagname = NULL;

1036

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

1037

return 0;

1038

}

1039

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1040

if_entry->d_name);

1041

if(ret < 0){

1042

perror("asprintf");

1043

return 0;

1044

}

1045

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1046

if(flags_fd == -1){

1047

perror("open");

1048

free(flagname);

1049

return 0;

1050

}

1051

free(flagname);

1052

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1053

/* read line from flags_fd */

1054

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1055

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1056

flagstring[(size_t)to_read] = '\0';

1057

if(flagstring == NULL){

1058

perror("malloc");

1059

close(flags_fd);

1060

return 0;

1061

}

1062

while(to_read > 0){

1063

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1064

(size_t)to_read));

1065

if(ssret == -1){

1066

perror("read");

1067

free(flagstring);

1068

close(flags_fd);

1069

return 0;

1070

}

1071

to_read -= ssret;

1072

if(ssret == 0){

1073

break;

1074

}

1075

}

1076

close(flags_fd);

1077

intmax_t tmpmax;

1078

char *tmp;

1079

errno = 0;

1080

tmpmax = strtoimax(flagstring, &tmp, 0);

1081

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1082

and not (isspace(*tmp)))

1083

or tmpmax != (ifreq_flags)tmpmax){

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1084

1121

if(debug){

1085

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1086

flagstring, if_entry->d_name);

1122

perror_plus("ioctl SIOCGIFFLAGS");

1087

1123

}

1088

free(flagstring);

1089

return 0;

1124

return false;

1090

1125

}

1091

free(flagstring);

1092

ifreq_flags flags = (ifreq_flags)tmpmax;

1126

return true;

1127

}

1128

1129

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

1130

1093

1131

/* Reject the loopback device */

1094

if(flags & IFF_LOOPBACK){

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1095

1133

if(debug){

1096

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1097

if_entry->d_name);

1134

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

1135

ifname);

1098

1136

}

1099

return 0;

1137

return false;

1100

1138

}

1101

1139

/* Accept point-to-point devices only if connect_to is specified */

1102

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1140

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1103

1141

if(debug){

1104

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1105

if_entry->d_name);

1142

fprintf_plus(stderr, "Accepting point-to-point interface"

1143

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

1106

1144

}

1107

return 1;

1145

return true;

1108

1146

}

1109

1147

/* Otherwise, reject non-broadcast-capable devices */

1110

if(not (flags & IFF_BROADCAST)){

1148

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1111

1149

if(debug){

1112

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1113

if_entry->d_name);

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1114

1152

}

1115

return 0;

1153

return false;

1116

1154

}

1117

1155

/* Reject non-ARP interfaces (including dummy interfaces) */

1118

if(flags & IFF_NOARP){

1156

if(ifr->ifr_flags & IFF_NOARP){

1119

1157

if(debug){

1120

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1121

if_entry->d_name);

1158

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

1159

ifname);

1122

1160

}

1123

return 0;

1161

return false;

1124

1162

}

1163

1125

1164

/* Accept this device */

1126

1165

if(debug){

1127

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1128

if_entry->d_name);

1166

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1129

1235

}

1130

1236

return 1;

1131

1237

}

1141

1247

return 1;

1142

1248

}

1143

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

if(not (S_ISREG(st.st_mode))){

1289

/* Not a regular file */

1290

if(debug){

1291

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1297

/* Not executable */

1298

if(debug){

1299

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

return 1;

1305

}

1306

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1308

int ret;

1309

struct timespec now;

1310

struct timespec waited_time;

1311

intmax_t block_time;

1312

1313

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1316

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

1317

" No timeout!\n");

1318

}

1319

ret = avahi_simple_poll_iterate(s, -1);

1320

} else {

1321

if (debug){

1322

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

1323

" it, or wait\n");

1324

}

1325

/* the current time */

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1327

if(ret == -1){

1328

perror_plus("clock_gettime");

1329

return -1;

1330

}

1331

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

1332

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

1333

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1335

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1337

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

1338

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

1339

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

1340

block_time = ((retry_interval

1341

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

1342

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

1343

1344

if (debug){

1345

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

1346

block_time);

1347

}

1348

1349

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1354

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1356

return 0;

1357

}

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1360

if(ret == -1){

1361

perror_plus("clock_gettime");

1362

return -1;

1363

}

1364

mc.current_server = mc.current_server->next;

1365

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

1366

servers, but don't block */

1367

}

1368

1369

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

1370

}

1371

if(ret != 0){

1372

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

1373

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

1374

}

1375

}

1376

}

1377

}

1378

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[i];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

if(debug){

1399

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

1400

direntry->d_name);

1401

}

1402

pid_t hook_pid = fork();

1403

if(hook_pid == 0){

1404

/* Child */

1405

dup2(devnull, STDIN_FILENO);

1406

close(devnull);

1407

dup2(STDERR_FILENO, STDOUT_FILENO);

1408

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

1409

if(ret == -1){

1410

perror_plus("setenv");

1411

return false;

1412

}

1413

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

1414

if(ret == -1){

1415

perror_plus("setenv");

1416

return false;

1417

}

1418

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

1419

if(ret == -1){

1420

perror_plus("setenv");

1421

return false;

1422

}

1423

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

1424

if(ret == -1){

1425

perror_plus("setenv");

1426

return false;

1427

}

1428

char *delaystring;

1429

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

1430

if(ret == -1){

1431

perror_plus("asprintf");

1432

return false;

1433

}

1434

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

1435

if(ret == -1){

1436

free(delaystring);

1437

perror_plus("setenv");

1438

return false;

1439

}

1440

free(delaystring);

1441

ret = execl(fullname, direntry->d_name, mode, NULL);

1442

perror_plus("execl");

1443

} else {

1444

int status;

1445

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

1446

perror_plus("waitpid");

1447

free(fullname);

1448

continue;

1449

}

1450

if(WIFEXITED(status)){

1451

if(WEXITSTATUS(status) != 0){

1452

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

1453

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

1454

WEXITSTATUS(status));

1455

free(fullname);

1456

continue;

1457

}

1458

} else if(WIFSIGNALED(status)){

1459

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

1460

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

1461

WTERMSIG(status));

1462

free(fullname);

1463

continue;

1464

} else {

1465

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

1466

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

1467

free(fullname);

1468

continue;

1469

}

1470

}

1471

free(fullname);

1472

if(quit_now){

1473

break;

1474

}

1475

}

1476

close(devnull);

1477

}

1478

return true;

1479

}

1480

1144

1481

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

1145

1482

AvahiSServiceBrowser *sb = NULL;

1146

1483

int error;

1163

1500

bool gnutls_initialized = false;

1164

1501

bool gpgme_initialized = false;

1165

1502

float delay = 2.5f;

1503

double retry_interval = 10; /* 10s between trying a server and

1504

retrying the same server again */

1166

1505

1167

1506

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1168

1507

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1174

1513

errno = 0;

1175

1514

ret = setgid(gid);

1176

1515

if(ret == -1){

1177

perror("setgid");

1516

perror_plus("setgid");

1178

1517

}

1179

1518

1180

1519

/* Lower user privileges (temporarily) */

1181

1520

errno = 0;

1182

1521

ret = seteuid(uid);

1183

1522

if(ret == -1){

1184

perror("seteuid");

1523

perror_plus("seteuid");

1185

1524

}

1186

1525

1187

1526

if(quit_now){

1222

1561

.arg = "SECONDS",

1223

1562

.doc = "Maximum delay to wait for interface startup",

1224

1563

.group = 2 },

1564

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

1565

.arg = "SECONDS",

1566

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

1567

.group = 2 },

1568

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

1569

.arg = "DIR",

1570

.doc = "Directory where network hooks are located",

1571

.group = 2 },

1225

1572

/*

1226

1573

* These reproduce what we would get without ARGP_NO_HELP

1227

1574

*/

1271

1618

if(errno != 0 or tmp == arg or *tmp != '\0'){

1272

1619

argp_error(state, "Bad delay");

1273

1620

}

1621

case 132: /* --retry */

1622

errno = 0;

1623

retry_interval = strtod(arg, &tmp);

1624

if(errno != 0 or tmp == arg or *tmp != '\0'

1625

or (retry_interval * 1000) > INT_MAX

1626

or retry_interval < 0){

1627

argp_error(state, "Bad retry interval");

1628

}

1629

break;

1630

case 133: /* --network-hook-dir */

1631

hookdir = arg;

1274

1632

break;

1275

1633

/*

1276

1634

* These reproduce what we would get without ARGP_NO_HELP

1283

1641

argp_state_help(state, state->out_stream,

1284

1642

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1285

1643

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

1286

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

1644

fprintf_plus(state->out_stream,

1645

"Mandos plugin mandos-client: ");

1646

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

1287

1647

exit(argp_err_exit_status);

1288

1648

break;

1289

1649

default:

1304

1664

case ENOMEM:

1305

1665

default:

1306

1666

errno = ret;

1307

perror("argp_parse");

1667

perror_plus("argp_parse");

1308

1668

exitcode = EX_OSERR;

1309

1669

goto end;

1310

1670

case EINVAL:

1312

1672

goto end;

1313

1673

}

1314

1674

}

1675

1676

if(getuid() == 0){

1677

/* Work around Debian bug #633582:

1678

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

1679

struct stat st;

1680

1681

/* Re-raise priviliges */

1682

errno = 0;

1683

ret = seteuid(0);

1684

if(ret == -1){

1685

perror_plus("seteuid");

1686

}

1687

1688

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

1689

int seckey_fd = open(seckey, O_RDONLY);

1690

if(seckey_fd == -1){

1691

perror_plus("open");

1692

} else {

1693

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

1694

if(ret == -1){

1695

perror_plus("fstat");

1696

} else {

1697

if(S_ISREG(st.st_mode)

1698

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

1699

ret = fchown(seckey_fd, uid, gid);

1700

if(ret == -1){

1701

perror_plus("fchown");

1702

}

1703

}

1704

}

1705

TEMP_FAILURE_RETRY(close(seckey_fd));

1706

}

1707

}

1708

1709

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

1710

int pubkey_fd = open(pubkey, O_RDONLY);

1711

if(pubkey_fd == -1){

1712

perror_plus("open");

1713

} else {

1714

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

1715

if(ret == -1){

1716

perror_plus("fstat");

1717

} else {

1718

if(S_ISREG(st.st_mode)

1719

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

1720

ret = fchown(pubkey_fd, uid, gid);

1721

if(ret == -1){

1722

perror_plus("fchown");

1723

}

1724

}

1725

}

1726

TEMP_FAILURE_RETRY(close(pubkey_fd));

1727

}

1728

}

1729

1730

/* Lower privileges */

1731

errno = 0;

1732

ret = seteuid(uid);

1733

if(ret == -1){

1734

perror_plus("seteuid");

1735

}

1736

}

1737

1738

/* Run network hooks */

1739

{

1740

if(getuid() == 0){

1741

/* Re-raise priviliges */

1742

errno = 0;

1743

ret = seteuid(0);

1744

if(ret == -1){

1745

perror_plus("seteuid");

1746

}

1747

}

1748

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

1749

goto end;

1750

}

1751

if(getuid() == 0){

1752

/* Lower privileges */

1753

errno = 0;

1754

ret = seteuid(uid);

1755

if(ret == -1){

1756

perror_plus("seteuid");

1757

}

1758

}

1759

}

1315

1760

1316

1761

if(not debug){

1317

1762

avahi_set_log_function(empty_log);

1318

1763

}

1319

1764

1320

1765

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

1321

1766

struct dirent **direntries;

1322

ret = scandir(sys_class_net, &direntries, good_interface,

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1323

1769

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1324

1776

if(ret >= 1){

1325

/* Pick the first good interface */

1777

/* Pick the first interface returned */

1326

1778

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

1327

1779

if(debug){

1328

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

1780

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

1329

1781

}

1330

1782

if(interface == NULL){

1331

perror("malloc");

1783

perror_plus("malloc");

1332

1784

free(direntries);

1333

1785

exitcode = EXIT_FAILURE;

1334

1786

goto end;

1336

1788

free(direntries);

1337

1789

} else {

1338

1790

free(direntries);

1339

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

1791

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

1340

1792

exitcode = EXIT_FAILURE;

1341

1793

goto end;

1342

1794

}

1348

1800

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

1349

1801

mc.simple_poll = avahi_simple_poll_new();

1350

1802

if(mc.simple_poll == NULL){

1351

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1803

fprintf_plus(stderr,

1804

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

1352

1805

exitcode = EX_UNAVAILABLE;

1353

1806

goto end;

1354

1807

}

1356

1809

sigemptyset(&sigterm_action.sa_mask);

1357

1810

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1358

1811

if(ret == -1){

1359

perror("sigaddset");

1812

perror_plus("sigaddset");

1360

1813

exitcode = EX_OSERR;

1361

1814

goto end;

1362

1815

}

1363

1816

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1364

1817

if(ret == -1){

1365

perror("sigaddset");

1818

perror_plus("sigaddset");

1366

1819

exitcode = EX_OSERR;

1367

1820

goto end;

1368

1821

}

1369

1822

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1370

1823

if(ret == -1){

1371

perror("sigaddset");

1824

perror_plus("sigaddset");

1372

1825

exitcode = EX_OSERR;

1373

1826

goto end;

1374

1827

}

1378

1831

*/

1379

1832

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1380

1833

if(ret == -1){

1381

perror("sigaction");

1834

perror_plus("sigaction");

1382

1835

return EX_OSERR;

1383

1836

}

1384

1837

if(old_sigterm_action.sa_handler != SIG_IGN){

1385

1838

ret = sigaction(SIGINT, &sigterm_action, NULL);

1386

1839

if(ret == -1){

1387

perror("sigaction");

1840

perror_plus("sigaction");

1388

1841

exitcode = EX_OSERR;

1389

1842

goto end;

1390

1843

}

1391

1844

}

1392

1845

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1393

1846

if(ret == -1){

1394

perror("sigaction");

1847

perror_plus("sigaction");

1395

1848

return EX_OSERR;

1396

1849

}

1397

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1398

1851

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1399

1852

if(ret == -1){

1400

perror("sigaction");

1853

perror_plus("sigaction");

1401

1854

exitcode = EX_OSERR;

1402

1855

goto end;

1403

1856

}

1404

1857

}

1405

1858

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1406

1859

if(ret == -1){

1407

perror("sigaction");

1860

perror_plus("sigaction");

1408

1861

return EX_OSERR;

1409

1862

}

1410

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1411

1864

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1412

1865

if(ret == -1){

1413

perror("sigaction");

1866

perror_plus("sigaction");

1414

1867

exitcode = EX_OSERR;

1415

1868

goto end;

1416

1869

}

1420

1873

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

1421

1874

if_index = (AvahiIfIndex) if_nametoindex(interface);

1422

1875

if(if_index == 0){

1423

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

1876

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

1424

1877

exitcode = EX_UNAVAILABLE;

1425

1878

goto end;

1426

1879

}

1433

1886

errno = 0;

1434

1887

ret = seteuid(0);

1435

1888

if(ret == -1){

1436

perror("seteuid");

1889

perror_plus("seteuid");

1437

1890

}

1438

1891

1439

1892

#ifdef __linux__

1443

1896

bool restore_loglevel = true;

1444

1897

if(ret == -1){

1445

1898

restore_loglevel = false;

1446

perror("klogctl");

1899

perror_plus("klogctl");

1447

1900

}

1448

1901

#endif /* __linux__ */

1449

1902

1450

1903

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1451

1904

if(sd < 0){

1452

perror("socket");

1905

perror_plus("socket");

1453

1906

exitcode = EX_OSERR;

1454

1907

#ifdef __linux__

1455

1908

if(restore_loglevel){

1456

1909

ret = klogctl(7, NULL, 0);

1457

1910

if(ret == -1){

1458

perror("klogctl");

1911

perror_plus("klogctl");

1459

1912

}

1460

1913

}

1461

1914

#endif /* __linux__ */

1463

1916

errno = 0;

1464

1917

ret = seteuid(uid);

1465

1918

if(ret == -1){

1466

perror("seteuid");

1919

perror_plus("seteuid");

1467

1920

}

1468

1921

goto end;

1469

1922

}

1470

1923

strcpy(network.ifr_name, interface);

1471

1924

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

1472

1925

if(ret == -1){

1473

perror("ioctl SIOCGIFFLAGS");

1926

perror_plus("ioctl SIOCGIFFLAGS");

1474

1927

#ifdef __linux__

1475

1928

if(restore_loglevel){

1476

1929

ret = klogctl(7, NULL, 0);

1477

1930

if(ret == -1){

1478

perror("klogctl");

1931

perror_plus("klogctl");

1479

1932

}

1480

1933

}

1481

1934

#endif /* __linux__ */

1484

1937

errno = 0;

1485

1938

ret = seteuid(uid);

1486

1939

if(ret == -1){

1487

perror("seteuid");

1940

perror_plus("seteuid");

1488

1941

}

1489

1942

goto end;

1490

1943

}

1494

1947

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

1495

1948

if(ret == -1){

1496

1949

take_down_interface = false;

1497

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1950

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1498

1951

exitcode = EX_OSERR;

1499

1952

#ifdef __linux__

1500

1953

if(restore_loglevel){

1501

1954

ret = klogctl(7, NULL, 0);

1502

1955

if(ret == -1){

1503

perror("klogctl");

1956

perror_plus("klogctl");

1504

1957

}

1505

1958

}

1506

1959

#endif /* __linux__ */

1508

1961

errno = 0;

1509

1962

ret = seteuid(uid);

1510

1963

if(ret == -1){

1511

perror("seteuid");

1964

perror_plus("seteuid");

1512

1965

}

1513

1966

goto end;

1514

1967

}

1515

1968

}

1516

/* sleep checking until interface is running */

1969

/* Sleep checking until interface is running.

1970

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

1517

1971

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

1518

1972

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

1519

1973

if(ret == -1){

1520

perror("ioctl SIOCGIFFLAGS");

1974

perror_plus("ioctl SIOCGIFFLAGS");

1521

1975

} else if(network.ifr_flags & IFF_RUNNING){

1522

1976

break;

1523

1977

}

1524

1978

struct timespec sleeptime = { .tv_nsec = 250000000 };

1525

1979

ret = nanosleep(&sleeptime, NULL);

1526

1980

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

1527

perror("nanosleep");

1981

perror_plus("nanosleep");

1528

1982

}

1529

1983

}

1530

1984

if(not take_down_interface){

1531

1985

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

1532

1986

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

1533

1987

if(ret == -1){

1534

perror("close");

1988

perror_plus("close");

1535

1989

}

1536

1990

}

1537

1991

#ifdef __linux__

1539

1993

/* Restores kernel loglevel to default */

1540

1994

ret = klogctl(7, NULL, 0);

1541

1995

if(ret == -1){

1542

perror("klogctl");

1996

perror_plus("klogctl");

1543

1997

}

1544

1998

}

1545

1999

#endif /* __linux__ */

1546

2000

/* Lower privileges */

1547

2001

errno = 0;

1548

if(take_down_interface){

1549

/* Lower privileges */

1550

ret = seteuid(uid);

1551

if(ret == -1){

1552

perror("seteuid");

1553

}

1554

} else {

1555

/* Lower privileges permanently */

1556

ret = setuid(uid);

1557

if(ret == -1){

1558

perror("setuid");

1559

}

2002

/* Lower privileges */

2003

ret = seteuid(uid);

2004

if(ret == -1){

2005

perror_plus("seteuid");

1560

2006

}

1561

2007

}

1562

2008

1566

2012

1567

2013

ret = init_gnutls_global(pubkey, seckey);

1568

2014

if(ret == -1){

1569

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

2015

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

1570

2016

exitcode = EX_UNAVAILABLE;

1571

2017

goto end;

1572

2018

} else {

1578

2024

}

1579

2025

1580

2026

if(mkdtemp(tempdir) == NULL){

1581

perror("mkdtemp");

2027

perror_plus("mkdtemp");

1582

2028

goto end;

1583

2029

}

1584

2030

tempdir_created = true;

1588

2034

}

1589

2035

1590

2036

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

1591

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

2037

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

1592

2038

exitcode = EX_UNAVAILABLE;

1593

2039

goto end;

1594

2040

} else {

1604

2050

/* (Mainly meant for debugging) */

1605

2051

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

1606

2052

if(address == NULL){

1607

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

2053

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

1608

2054

exitcode = EX_USAGE;

1609

2055

goto end;

1610

2056

}

1618

2064

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

1619

2065

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

1620

2066

or tmpmax != (uint16_t)tmpmax){

1621

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

2067

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

1622

2068

exitcode = EX_USAGE;

1623

2069

goto end;

1624

2070

}

1629

2075

1630

2076

port = (uint16_t)tmpmax;

1631

2077

*address = '\0';

1632

address = connect_to;

1633

2078

/* Colon in address indicates IPv6 */

1634

2079

int af;

1635

if(strchr(address, ':') != NULL){

2080

if(strchr(connect_to, ':') != NULL){

1636

2081

af = AF_INET6;

2082

/* Accept [] around IPv6 address - see RFC 5952 */

2083

if(connect_to[0] == '[' and address[-1] == ']')

2084

{

2085

connect_to++;

2086

address[-1] = '\0';

2087

}

1637

2088

} else {

1638

2089

af = AF_INET;

1639

2090

}

2091

address = connect_to;

1640

2092

1641

2093

if(quit_now){

1642

2094

goto end;

1643

2095

}

1644

2096

1645

2097

while(not quit_now){

1646

2098

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

1647

2099

if(quit_now or ret == 0){

1648

2100

break;

1649

2101

}

1650

sleep(15);

1651

};

1652

2102

if(debug){

2103

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

2104

(int)retry_interval);

2105

}

2106

sleep((int)retry_interval);

2107

}

2108

1653

2109

if (not quit_now){

1654

2110

exitcode = EXIT_SUCCESS;

1655

2111

}

1656

2112

1657

2113

goto end;

1658

2114

}

1659

2115

1681

2137

1682

2138

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

1683

2139

if(mc.server == NULL){

1684

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

1685

avahi_strerror(error));

2140

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

2141

avahi_strerror(error));

1686

2142

exitcode = EX_UNAVAILABLE;

1687

2143

goto end;

1688

2144

}

1696

2152

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1697

2153

NULL, 0, browse_callback, NULL);

1698

2154

if(sb == NULL){

1699

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

1700

avahi_strerror(avahi_server_errno(mc.server)));

2155

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

2156

avahi_strerror(avahi_server_errno(mc.server)));

1701

2157

exitcode = EX_UNAVAILABLE;

1702

2158

goto end;

1703

2159

}

1709

2165

/* Run the main loop */

1710

2166

1711

2167

if(debug){

1712

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

1713

}

1714

1715

avahi_simple_poll_loop(mc.simple_poll);

2168

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

2169

}

2170

2171

ret = avahi_loop_with_timeout(mc.simple_poll,

2172

(int)(retry_interval * 1000));

2173

if(debug){

2174

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

2175

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

2176

}

1716

2177

1717

2178

end:

1718

2179

1719

2180

if(debug){

1720

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

2181

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

1721

2182

}

1722

2183

1723

2184

/* Cleanup things */

1739

2200

if(gpgme_initialized){

1740

2201

gpgme_release(mc.ctx);

1741

2202

}

2203

2204

/* Cleans up the circular linked list of Mandos servers the client

2205

has seen */

2206

if(mc.current_server != NULL){

2207

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

2208

while(mc.current_server != NULL){

2209

server *next = mc.current_server->next;

2210

free(mc.current_server);

2211

mc.current_server = next;

2212

}

2213

}

1742

2214

1743

/* Take down the network interface */

1744

if(take_down_interface){

1745

/* Re-raise priviliges */

1746

errno = 0;

1747

ret = seteuid(0);

1748

if(ret == -1){

1749

perror("seteuid");

1750

}

1751

if(geteuid() == 0){

2215

/* Re-raise priviliges */

2216

{

2217

if(getuid() == 0){

2218

errno = 0;

2219

ret = seteuid(0);

2220

if(ret == -1){

2221

perror_plus("seteuid");

2222

}

2223

}

2224

/* Run network hooks */

2225

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

2226

goto end;

2227

}

2228

2229

/* Take down the network interface */

2230

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

1752

2231

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

1753

2232

if(ret == -1){

1754

perror("ioctl SIOCGIFFLAGS");

1755

} else if(network.ifr_flags & IFF_UP) {

2233

perror_plus("ioctl SIOCGIFFLAGS");

2234

} else if(network.ifr_flags & IFF_UP){

1756

2235

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

1757

2236

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

1758

2237

if(ret == -1){

1759

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2238

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1760

2239

}

1761

2240

}

1762

2241

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

1763

2242

if(ret == -1){

1764

perror("close");

1765

}

1766

/* Lower privileges permanently */

1767

errno = 0;

1768

ret = setuid(uid);

1769

if(ret == -1){

1770

perror("setuid");

1771

}

2243

perror_plus("close");

2244

}

2245

}

2246

}

2247

if(getuid() == 0){

2248

/* Lower privileges permanently */

2249

errno = 0;

2250

ret = setuid(uid);

2251

if(ret == -1){

2252

perror_plus("setuid");

1772

2253

}

1773

2254

}

1774

2255

1776

2257

if(tempdir_created){

1777

2258

struct dirent **direntries = NULL;

1778

2259

struct dirent *direntry = NULL;

1779

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1780

if (ret > 0){

1781

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

2260

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

2261

alphasort);

2262

if (numentries > 0){

2263

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

1782

2264

direntry = direntries[i];

1783

2265

char *fullname = NULL;

1784

2266

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

1785

2267

direntry->d_name);

1786

2268

if(ret < 0){

1787

perror("asprintf");

2269

perror_plus("asprintf");

1788

2270

continue;

1789

2271

}

1790

2272

ret = remove(fullname);

1791

2273

if(ret == -1){

1792

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

1793

strerror(errno));

2274

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

2275

strerror(errno));

1794

2276

}

1795

2277

free(fullname);

1796

2278

}

1797

2279

}

1798

2280

1799

/* need to be cleaned even if ret == 0 because man page dont specify */

2281

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

1800

2282

free(direntries);

1801

if (ret == -1){

1802

perror("scandir");

2283

if (numentries == -1){

2284

perror_plus("scandir");

1803

2285

}

1804

2286

ret = rmdir(tempdir);

1805

2287

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

1806

perror("rmdir");

2288

perror_plus("rmdir");

1807

2289

}

1808

2290

}

1809

2291

1814

2296

&old_sigterm_action,

1815

2297

NULL));

1816

2298

if(ret == -1){

1817

perror("sigaction");

2299

perror_plus("sigaction");

1818

2300

}

1819

2301

do {

1820

2302

ret = raise(signal_received);

1821

2303

} while(ret != 0 and errno == EINTR);

1822

2304

if(ret != 0){

1823

perror("raise");

2305

perror_plus("raise");

1824

2306

abort();

1825

2307

}

1826

2308

TEMP_FAILURE_RETRY(pause());