/mandos/release : revision 237.7.83

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(),

72

73

*/

73

74

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

74

75

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

75

setgid(), pause() */

76

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

76

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

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() */

90

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

87

91

88

92

#ifdef __linux__

89

93

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

107

111

init_gnutls_session(),

108

112

GNUTLS_* */

109

113

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

112

116

113

117

/* GPGME */

114

118

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

122

126

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

123

127

#define SECKEY "seckey.txt"

124

128

#define PUBKEY "pubkey.txt"

129

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

125

130

126

131

bool debug = false;

127

132

static const char mandos_protocol_version[] = "1";

128

133

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

129

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

134

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

130

135

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

131

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

139

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

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

143

AvahiIfIndex if_index;

144

int af;

145

struct timespec last_seen;

146

struct server *next;

147

struct server *prev;

148

} server;

132

149

133

150

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

134

151

typedef struct {

139

156

gnutls_dh_params_t dh_params;

140

157

const char *priority;

141

158

gpgme_ctx_t ctx;

159

server *current_server;

142

160

} mandos_context;

143

161

144

162

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

145

163

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

146

164

.dh_bits = 1024, .priority = "SECURE256"

147

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

165

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

166

.current_server = NULL };

148

167

149

168

sig_atomic_t quit_now = 0;

150

169

int signal_received = 0;

151

170

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

int e = errno;

174

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

175

program_invocation_short_name);

176

errno = e;

177

perror(print_text);

178

}

179

180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

186

program_invocation_short_name));

187

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

188

}

189

152

190

/*

153

191

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

154

192

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

155

193

* "buffer_length" is how much is already used.

156

194

*/

157

195

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

196

size_t buffer_capacity){

159

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

198

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

161

199

if(buffer == NULL){

166

204

return buffer_capacity;

167

205

}

168

206

207

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

208

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

209

int af){

210

int ret;

211

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

212

if(new_server == NULL){

213

perror_plus("malloc");

214

return false;

215

}

216

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

220

if(new_server->ip == NULL){

221

perror_plus("strdup");

222

return false;

223

}

224

/* Special case of first server */

225

if (mc.current_server == NULL){

226

new_server->next = new_server;

227

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

230

} else {

231

new_server->next = mc.current_server;

232

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

233

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

240

}

241

return true;

242

}

243

169

244

/*

170

245

* Initialize GPGME.

171

246

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

247

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

248

const char *tempdir){

174

249

gpgme_error_t rc;

175

250

gpgme_engine_info_t engine_info;

176

251

185

260

186

261

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

187

262

if(fd == -1){

188

perror("open");

263

perror_plus("open");

189

264

return false;

190

265

}

191

266

192

267

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

268

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));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

196

271

return false;

197

272

}

198

273

199

274

rc = gpgme_op_import(mc.ctx, pgp_data);

200

275

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

203

278

return false;

204

279

}

205

280

206

281

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

207

282

if(ret == -1){

208

perror("close");

283

perror_plus("close");

209

284

}

210

285

gpgme_data_release(pgp_data);

211

286

return true;

212

287

}

213

288

214

289

if(debug){

215

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

290

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

216

291

}

217

292

218

293

/* Init GPGME */

219

294

gpgme_check_version(NULL);

220

295

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

296

if(rc != GPG_ERR_NO_ERROR){

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

224

299

return false;

225

300

}

226

301

227

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

302

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

228

303

rc = gpgme_get_engine_info(&engine_info);

229

304

if(rc != GPG_ERR_NO_ERROR){

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

232

307

return false;

233

308

}

234

309

while(engine_info != NULL){

240

315

engine_info = engine_info->next;

241

316

}

242

317

if(engine_info == NULL){

243

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

318

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

319

tempdir);

244

320

return false;

245

321

}

246

322

247

323

/* Create new GPGME "context" */

248

324

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

249

325

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

252

329

return false;

253

330

}

254

331

273

350

ssize_t plaintext_length = 0;

274

351

275

352

if(debug){

276

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

353

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

277

354

}

278

355

279

356

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

280

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

358

0);

282

359

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));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

285

362

return -1;

286

363

}

287

364

288

365

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

289

366

rc = gpgme_data_new(&dh_plain);

290

367

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

293

371

gpgme_data_release(dh_crypto);

294

372

return -1;

295

373

}

298

376

data buffer */

299

377

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

300

378

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

303

381

plaintext_length = -1;

304

382

if(debug){

305

383

gpgme_decrypt_result_t result;

306

384

result = gpgme_op_decrypt_result(mc.ctx);

307

385

if(result == NULL){

308

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

386

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

309

387

} 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);

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

314

392

if(result->file_name != NULL){

315

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

393

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

316

394

}

317

395

gpgme_recipient_t recipient;

318

396

recipient = result->recipients;

319

397

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");

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

326

405

recipient = recipient->next;

327

406

}

328

407

}

331

410

}

332

411

333

412

if(debug){

334

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

413

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

335

414

}

336

415

337

416

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

338

417

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

339

perror("gpgme_data_seek");

418

perror_plus("gpgme_data_seek");

340

419

plaintext_length = -1;

341

420

goto decrypt_end;

342

421

}

344

423

*plaintext = NULL;

345

424

while(true){

346

425

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

349

428

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

353

432

}

354

433

355

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

439

break;

361

440

}

362

441

if(ret < 0){

363

perror("gpgme_data_read");

442

perror_plus("gpgme_data_read");

364

443

plaintext_length = -1;

365

444

goto decrypt_end;

366

445

}

368

447

}

369

448

370

449

if(debug){

371

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

450

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

372

451

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

373

452

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

374

453

}

396

475

/* GnuTLS log function callback */

397

476

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

398

477

const char* string){

399

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

478

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

400

479

}

401

480

402

481

static int init_gnutls_global(const char *pubkeyfilename,

404

483

int ret;

405

484

406

485

if(debug){

407

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

486

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

408

487

}

409

488

410

489

ret = gnutls_global_init();

411

490

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

414

493

return -1;

415

494

}

416

495

423

502

}

424

503

425

504

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

506

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));

507

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

508

safer_gnutls_strerror(ret));

433

509

gnutls_global_deinit();

434

510

return -1;

435

511

}

436

512

437

513

if(debug){

438

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

439

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

440

seckeyfilename);

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

441

518

}

442

519

443

520

ret = gnutls_certificate_set_openpgp_key_file

444

521

(mc.cred, pubkeyfilename, seckeyfilename,

445

522

GNUTLS_OPENPGP_FMT_BASE64);

446

523

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));

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

452

529

goto globalfail;

453

530

}

454

531

455

532

/* GnuTLS server initialization */

456

533

ret = gnutls_dh_params_init(&mc.dh_params);

457

534

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

460

538

goto globalfail;

461

539

}

462

540

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

463

541

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

466

544

goto globalfail;

467

545

}

468

546

488

566

}

489

567

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

490

568

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

493

572

}

494

573

495

574

{

502

581

}

503

582

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

504

583

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));

584

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

585

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

586

safer_gnutls_strerror(ret));

508

587

gnutls_deinit(*session);

509

588

return -1;

510

589

}

519

598

}

520

599

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

521

600

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

524

603

gnutls_deinit(*session);

525

604

return -1;

526

605

}

571

650

pf = PF_INET;

572

651

break;

573

652

default:

574

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

653

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

575

654

errno = EINVAL;

576

655

return -1;

577

656

}

582

661

}

583

662

584

663

if(debug){

585

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

586

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

587

666

}

588

667

589

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

669

if(tcp_sd < 0){

591

670

int e = errno;

592

perror("socket");

671

perror_plus("socket");

593

672

errno = e;

594

673

goto mandos_end;

595

674

}

609

688

}

610

689

if(ret < 0 ){

611

690

int e = errno;

612

perror("inet_pton");

691

perror_plus("inet_pton");

613

692

errno = e;

614

693

goto mandos_end;

615

694

}

616

695

if(ret == 0){

617

696

int e = errno;

618

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

697

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

619

698

errno = e;

620

699

goto mandos_end;

621

700

}

626

705

627

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

707

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

629

-Wunreachable-code*/

708

-Wunreachable-code*/

630

709

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

633

712

errno = EINVAL;

634

713

goto mandos_end;

635

714

}

651

730

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

652

731

char interface[IF_NAMESIZE];

653

732

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

654

perror("if_indextoname");

733

perror_plus("if_indextoname");

655

734

} else {

656

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

657

ip, interface, port);

735

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

736

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

658

737

}

659

738

} else {

660

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

661

port);

739

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

740

ip, port);

662

741

}

663

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

750

sizeof(addrstr));

672

751

}

673

752

if(pcret == NULL){

674

perror("inet_ntop");

753

perror_plus("inet_ntop");

675

754

} else {

676

755

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

677

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

756

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

678

757

}

679

758

}

680

759

}

692

771

if(ret < 0){

693

772

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

694

773

int e = errno;

695

perror("connect");

774

perror_plus("connect");

696

775

errno = e;

697

776

}

698

777

goto mandos_end;

708

787

while(true){

709

788

size_t out_size = strlen(out);

710

789

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

711

out_size - written));

790

out_size - written));

712

791

if(ret == -1){

713

792

int e = errno;

714

perror("write");

793

perror_plus("write");

715

794

errno = e;

716

795

goto mandos_end;

717

796

}

734

813

}

735

814

736

815

if(debug){

737

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

816

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

738

817

}

739

818

740

819

if(quit_now){

742

821

goto mandos_end;

743

822

}

744

823

824

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

745

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

826

747

827

if(quit_now){

759

839

760

840

if(ret != GNUTLS_E_SUCCESS){

761

841

if(debug){

762

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

842

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

763

843

gnutls_perror(ret);

764

844

}

765

845

errno = EPROTO;

769

849

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

770

850

771

851

if(debug){

772

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

773

ip);

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

774

854

}

775

855

776

856

while(true){

781

861

}

782

862

783

863

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

864

buffer_capacity);

785

865

if(buffer_capacity == 0){

786

866

int e = errno;

787

perror("incbuffer");

867

perror_plus("incbuffer");

788

868

errno = e;

789

869

goto mandos_end;

790

870

}

814

894

}

815

895

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

816

896

if(ret < 0){

817

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

897

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

898

"***\n");

818

899

gnutls_perror(ret);

819

900

errno = EPROTO;

820

901

goto mandos_end;

821

902

}

822

903

break;

823

904

default:

824

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

825

" encrypted session with Mandos server\n");

905

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

906

" encrypted session with Mandos server\n");

826

907

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

908

errno = EIO;

828

909

goto mandos_end;

833

914

}

834

915

835

916

if(debug){

836

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

917

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

837

918

}

838

919

839

920

if(quit_now){

851

932

852

933

if(buffer_length > 0){

853

934

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

856

936

&decrypted_buffer);

857

937

if(decrypted_buffer_size >= 0){

858

938

869

949

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

870

950

int e = errno;

871

951

if(debug){

872

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

873

strerror(errno));

952

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

953

strerror(errno));

874

954

}

875

955

errno = e;

876

956

goto mandos_end;

895

975

if(e == 0){

896

976

e = errno;

897

977

}

898

perror("close");

978

perror_plus("close");

899

979

}

900

980

gnutls_deinit(session);

981

errno = e;

901

982

if(quit_now){

902

e = EINTR;

983

errno = EINTR;

903

984

retval = -1;

904

985

}

905

errno = e;

906

986

}

907

987

return retval;

908

988

}

933

1013

switch(event){

934

1014

default:

935

1015

case AVAHI_RESOLVER_FAILURE:

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

939

1020

break;

940

1021

941

1022

case AVAHI_RESOLVER_FOUND:

943

1024

char ip[AVAHI_ADDRESS_STR_MAX];

944

1025

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

945

1026

if(debug){

946

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

947

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

948

ip, (intmax_t)interface, port);

1027

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

1028

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

1029

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

949

1030

}

950

1031

int ret = start_mandos_communication(ip, port, interface,

951

1032

avahi_proto_to_af(proto));

952

1033

if(ret == 0){

953

1034

avahi_simple_poll_quit(mc.simple_poll);

1035

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

954

1041

}

955

1042

}

956

1043

}

980

1067

default:

981

1068

case AVAHI_BROWSER_FAILURE:

982

1069

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

985

1072

avahi_simple_poll_quit(mc.simple_poll);

986

1073

return;

987

1074

994

1081

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

995

1082

name, type, domain, protocol, 0,

996

1083

resolve_callback, NULL) == NULL)

997

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

998

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

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

999

1087

break;

1000

1088

1001

1089

case AVAHI_BROWSER_REMOVE:

1004

1092

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1093

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1094

if(debug){

1007

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

1095

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

1096

" searching...\n");

1008

1097

}

1009

1098

break;

1010

1099

}

1011

1100

}

1012

1101

1013

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

1102

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

1014

1103

static void handle_sigterm(int sig){

1015

1104

if(quit_now){

1016

1105

return;

1018

1107

quit_now = 1;

1019

1108

signal_received = sig;

1020

1109

int old_errno = errno;

1110

/* set main loop to exit */

1021

1111

if(mc.simple_poll != NULL){

1022

1112

avahi_simple_poll_quit(mc.simple_poll);

1023

1113

}

1024

1114

errno = old_errno;

1025

1115

}

1026

1116

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

return 0;

1037

}

1038

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

1039

if_entry->d_name);

1040

if(ret < 0){

1041

perror("asprintf");

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

free(flagname);

1048

return 0;

1049

}

1050

free(flagname);

1051

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

1052

/* read line from flags_fd */

1053

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

1054

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

1055

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

1056

if(flagstring == NULL){

1057

perror("malloc");

1058

close(flags_fd);

1059

return 0;

1060

}

1061

while(to_read > 0){

1062

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

1063

(size_t)to_read));

1064

if(ssret == -1){

1065

perror("read");

1066

free(flagstring);

1067

close(flags_fd);

1068

return 0;

1069

}

1070

to_read -= ssret;

1071

if(ssret == 0){

1072

break;

1073

}

1074

}

1075

close(flags_fd);

1076

intmax_t tmpmax;

1077

char *tmp;

1078

errno = 0;

1079

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

1080

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

1081

and not (isspace(*tmp)))

1082

or tmpmax != (ifreq_flags)tmpmax){

1117

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

1118

int ret;

1119

1120

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

1121

if(s < 0){

1122

perror_plus("socket");

1123

return false;

1124

}

1125

strcpy(ifr->ifr_name, ifname);

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

if(ret == -1){

1083

1128

if(debug){

1084

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

1085

flagstring, if_entry->d_name);

1129

perror_plus("ioctl SIOCGIFFLAGS");

1086

1130

}

1087

free(flagstring);

1088

return 0;

1131

return false;

1089

1132

}

1090

free(flagstring);

1091

ifreq_flags flags = (ifreq_flags)tmpmax;

1133

return true;

1134

}

1135

1136

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

1137

1092

1138

/* Reject the loopback device */

1093

if(flags & IFF_LOOPBACK){

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1094

1140

if(debug){

1095

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

1096

if_entry->d_name);

1141

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

1142

ifname);

1097

1143

}

1098

return 0;

1144

return false;

1099

1145

}

1100

1146

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

1101

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

1147

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

1102

1148

if(debug){

1103

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

1104

if_entry->d_name);

1149

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

1150

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

1105

1151

}

1106

return 1;

1152

return true;

1107

1153

}

1108

1154

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

1109

if(not (flags & IFF_BROADCAST)){

1155

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

1110

1156

if(debug){

1111

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

1112

if_entry->d_name);

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1113

1159

}

1114

return 0;

1160

return false;

1115

1161

}

1116

1162

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

1117

if(flags & IFF_NOARP){

1163

if(ifr->ifr_flags & IFF_NOARP){

1118

1164

if(debug){

1119

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

1120

if_entry->d_name);

1165

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

1166

ifname);

1121

1167

}

1122

return 0;

1168

return false;

1123

1169

}

1170

1124

1171

/* Accept this device */

1125

1172

if(debug){

1126

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

1127

if_entry->d_name);

1128

}

1129

return 1;

1173

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

1174

}

1175

return true;

1176

}

1177

1178

/*

1179

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

1180

* corresponds to an acceptable network device.

1181

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

1182

*/

1183

int good_interface(const struct dirent *if_entry){

1184

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

1185

return 0;

1186

}

1187

1188

struct ifreq ifr;

1189

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

1190

if(debug){

1191

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

1192

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

1193

}

1194

return 0;

1195

}

1196

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1246

int notdotentries(const struct dirent *direntry){

1247

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

1248

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

1249

and (direntry->d_name[1] == '\0'

1250

or (direntry->d_name[1] == '.'

1251

and direntry->d_name[2] == '\0'))){

1252

return 0;

1253

}

1254

return 1;

1255

}

1256

1257

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

1258

int runnable_hook(const struct dirent *direntry){

1259

int ret;

1260

size_t sret;

1261

struct stat st;

1262

1263

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

1264

/* Empty name? */

1265

return 0;

1266

}

1267

1268

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

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

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

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1289

if(ret == -1){

1290

if(debug){

1291

perror_plus("Could not stat hook");

1292

}

1293

return 0;

1294

}

1295

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

1296

/* Not a regular file */

1297

if(debug){

1298

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

1299

direntry->d_name);

1300

}

1301

return 0;

1302

}

1303

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

1304

/* Not executable */

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 0;

1310

}

1311

if(debug){

1312

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1313

direntry->d_name);

1314

}

1315

return 1;

1316

}

1317

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1319

int ret;

1320

struct timespec now;

1321

struct timespec waited_time;

1322

intmax_t block_time;

1323

1324

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1327

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

1328

" No timeout!\n");

1329

}

1330

ret = avahi_simple_poll_iterate(s, -1);

1331

} else {

1332

if (debug){

1333

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

1334

" it, or wait\n");

1335

}

1336

/* the current time */

1337

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1338

if(ret == -1){

1339

perror_plus("clock_gettime");

1340

return -1;

1341

}

1342

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

1343

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

1344

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1346

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1348

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

1349

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

1350

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

1351

block_time = ((retry_interval

1352

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

1353

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

1354

1355

if (debug){

1356

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

1357

block_time);

1358

}

1359

1360

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1365

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1367

return 0;

1368

}

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1371

if(ret == -1){

1372

perror_plus("clock_gettime");

1373

return -1;

1374

}

1375

mc.current_server = mc.current_server->next;

1376

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

1377

servers, but don't block */

1378

}

1379

1380

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

1381

}

1382

if(ret != 0){

1383

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

1384

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

1385

}

1386

}

1387

}

1388

}

1389

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

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

1477

perror_plus("execl");

1478

_exit(EXIT_FAILURE);

1479

}

1480

} else {

1481

int status;

1482

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

1483

perror_plus("waitpid");

1484

free(fullname);

1485

continue;

1486

}

1487

if(WIFEXITED(status)){

1488

if(WEXITSTATUS(status) != 0){

1489

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

1490

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

1491

WEXITSTATUS(status));

1492

free(fullname);

1493

continue;

1494

}

1495

} else if(WIFSIGNALED(status)){

1496

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

1497

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

1498

WTERMSIG(status));

1499

free(fullname);

1500

continue;

1501

} else {

1502

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

1503

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

1504

free(fullname);

1505

continue;

1506

}

1507

}

1508

free(fullname);

1509

if(debug){

1510

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

1511

direntry->d_name);

1512

}

1513

}

1514

close(devnull);

1515

}

1516

return true;

1130

1517

}

1131

1518

1132

1519

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

1151

1538

bool gnutls_initialized = false;

1152

1539

bool gpgme_initialized = false;

1153

1540

float delay = 2.5f;

1541

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

1542

retrying the same server again */

1154

1543

1155

1544

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1156

1545

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1162

1551

errno = 0;

1163

1552

ret = setgid(gid);

1164

1553

if(ret == -1){

1165

perror("setgid");

1554

perror_plus("setgid");

1166

1555

}

1167

1556

1168

1557

/* Lower user privileges (temporarily) */

1169

1558

errno = 0;

1170

1559

ret = seteuid(uid);

1171

1560

if(ret == -1){

1172

perror("seteuid");

1561

perror_plus("seteuid");

1173

1562

}

1174

1563

1175

1564

if(quit_now){

1210

1599

.arg = "SECONDS",

1211

1600

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

1212

1601

.group = 2 },

1602

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

1603

.arg = "SECONDS",

1604

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

1605

.group = 2 },

1606

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

1607

.arg = "DIR",

1608

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

1609

.group = 2 },

1213

1610

/*

1214

1611

* These reproduce what we would get without ARGP_NO_HELP

1215

1612

*/

1259

1656

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

1260

1657

argp_error(state, "Bad delay");

1261

1658

}

1659

case 132: /* --retry */

1660

errno = 0;

1661

retry_interval = strtod(arg, &tmp);

1662

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

1663

or (retry_interval * 1000) > INT_MAX

1664

or retry_interval < 0){

1665

argp_error(state, "Bad retry interval");

1666

}

1667

break;

1668

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

1669

hookdir = arg;

1262

1670

break;

1263

1671

/*

1264

1672

* These reproduce what we would get without ARGP_NO_HELP

1271

1679

argp_state_help(state, state->out_stream,

1272

1680

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1273

1681

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

1274

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

1682

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

1275

1683

exit(argp_err_exit_status);

1276

1684

break;

1277

1685

default:

1292

1700

case ENOMEM:

1293

1701

default:

1294

1702

errno = ret;

1295

perror("argp_parse");

1703

perror_plus("argp_parse");

1296

1704

exitcode = EX_OSERR;

1297

1705

goto end;

1298

1706

case EINVAL:

1300

1708

goto end;

1301

1709

}

1302

1710

}

1711

1712

{

1713

/* Work around Debian bug #633582:

1714

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

1715

1716

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

1721

} else {

1722

struct stat st;

1723

1724

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

1725

int seckey_fd = open(seckey, O_RDONLY);

1726

if(seckey_fd == -1){

1727

perror_plus("open");

1728

} else {

1729

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

1730

if(ret == -1){

1731

perror_plus("fstat");

1732

} else {

1733

if(S_ISREG(st.st_mode)

1734

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

1735

ret = fchown(seckey_fd, uid, gid);

1736

if(ret == -1){

1737

perror_plus("fchown");

1738

}

1739

}

1740

}

1741

TEMP_FAILURE_RETRY(close(seckey_fd));

1742

}

1743

}

1744

1745

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

1746

int pubkey_fd = open(pubkey, O_RDONLY);

1747

if(pubkey_fd == -1){

1748

perror_plus("open");

1749

} else {

1750

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

1751

if(ret == -1){

1752

perror_plus("fstat");

1753

} else {

1754

if(S_ISREG(st.st_mode)

1755

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

1756

ret = fchown(pubkey_fd, uid, gid);

1757

if(ret == -1){

1758

perror_plus("fchown");

1759

}

1760

}

1761

}

1762

TEMP_FAILURE_RETRY(close(pubkey_fd));

1763

}

1764

}

1765

1766

/* Lower privileges */

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

perror_plus("seteuid");

1771

}

1772

}

1773

}

1774

1775

/* Run network hooks */

1776

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

1777

goto end;

1778

}

1303

1779

1304

1780

if(not debug){

1305

1781

avahi_set_log_function(empty_log);

1306

1782

}

1307

1783

1308

1784

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

1309

1785

struct dirent **direntries;

1310

ret = scandir(sys_class_net, &direntries, good_interface,

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1311

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1312

1795

if(ret >= 1){

1313

/* Pick the first good interface */

1796

/* Pick the first interface returned */

1314

1797

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

1315

1798

if(debug){

1316

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

1799

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

1317

1800

}

1318

1801

if(interface == NULL){

1319

perror("malloc");

1802

perror_plus("malloc");

1320

1803

free(direntries);

1321

1804

exitcode = EXIT_FAILURE;

1322

1805

goto end;

1324

1807

free(direntries);

1325

1808

} else {

1326

1809

free(direntries);

1327

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

1810

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

1328

1811

exitcode = EXIT_FAILURE;

1329

1812

goto end;

1330

1813

}

1336

1819

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

1337

1820

mc.simple_poll = avahi_simple_poll_new();

1338

1821

if(mc.simple_poll == NULL){

1339

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

1822

fprintf_plus(stderr,

1823

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

1340

1824

exitcode = EX_UNAVAILABLE;

1341

1825

goto end;

1342

1826

}

1344

1828

sigemptyset(&sigterm_action.sa_mask);

1345

1829

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

1346

1830

if(ret == -1){

1347

perror("sigaddset");

1831

perror_plus("sigaddset");

1348

1832

exitcode = EX_OSERR;

1349

1833

goto end;

1350

1834

}

1351

1835

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

1352

1836

if(ret == -1){

1353

perror("sigaddset");

1837

perror_plus("sigaddset");

1354

1838

exitcode = EX_OSERR;

1355

1839

goto end;

1356

1840

}

1357

1841

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

1358

1842

if(ret == -1){

1359

perror("sigaddset");

1843

perror_plus("sigaddset");

1360

1844

exitcode = EX_OSERR;

1361

1845

goto end;

1362

1846

}

1366

1850

*/

1367

1851

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

1368

1852

if(ret == -1){

1369

perror("sigaction");

1853

perror_plus("sigaction");

1370

1854

return EX_OSERR;

1371

1855

}

1372

1856

if(old_sigterm_action.sa_handler != SIG_IGN){

1373

1857

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

1374

1858

if(ret == -1){

1375

perror("sigaction");

1859

perror_plus("sigaction");

1376

1860

exitcode = EX_OSERR;

1377

1861

goto end;

1378

1862

}

1379

1863

}

1380

1864

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

1381

1865

if(ret == -1){

1382

perror("sigaction");

1866

perror_plus("sigaction");

1383

1867

return EX_OSERR;

1384

1868

}

1385

1869

if(old_sigterm_action.sa_handler != SIG_IGN){

1386

1870

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

1387

1871

if(ret == -1){

1388

perror("sigaction");

1872

perror_plus("sigaction");

1389

1873

exitcode = EX_OSERR;

1390

1874

goto end;

1391

1875

}

1392

1876

}

1393

1877

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

1394

1878

if(ret == -1){

1395

perror("sigaction");

1879

perror_plus("sigaction");

1396

1880

return EX_OSERR;

1397

1881

}

1398

1882

if(old_sigterm_action.sa_handler != SIG_IGN){

1399

1883

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

1400

1884

if(ret == -1){

1401

perror("sigaction");

1885

perror_plus("sigaction");

1402

1886

exitcode = EX_OSERR;

1403

1887

goto end;

1404

1888

}

1408

1892

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

1409

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1410

1894

if(if_index == 0){

1411

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

1895

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

1412

1896

exitcode = EX_UNAVAILABLE;

1413

1897

goto end;

1414

1898

}

1421

1905

errno = 0;

1422

1906

ret = seteuid(0);

1423

1907

if(ret == -1){

1424

perror("seteuid");

1908

perror_plus("seteuid");

1425

1909

}

1426

1910

1427

1911

#ifdef __linux__

1431

1915

bool restore_loglevel = true;

1432

1916

if(ret == -1){

1433

1917

restore_loglevel = false;

1434

perror("klogctl");

1918

perror_plus("klogctl");

1435

1919

}

1436

1920

#endif /* __linux__ */

1437

1921

1438

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1439

1923

if(sd < 0){

1440

perror("socket");

1924

perror_plus("socket");

1441

1925

exitcode = EX_OSERR;

1442

1926

#ifdef __linux__

1443

1927

if(restore_loglevel){

1444

1928

ret = klogctl(7, NULL, 0);

1445

1929

if(ret == -1){

1446

perror("klogctl");

1930

perror_plus("klogctl");

1447

1931

}

1448

1932

}

1449

1933

#endif /* __linux__ */

1451

1935

errno = 0;

1452

1936

ret = seteuid(uid);

1453

1937

if(ret == -1){

1454

perror("seteuid");

1938

perror_plus("seteuid");

1455

1939

}

1456

1940

goto end;

1457

1941

}

1458

1942

strcpy(network.ifr_name, interface);

1459

1943

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

1460

1944

if(ret == -1){

1461

perror("ioctl SIOCGIFFLAGS");

1945

perror_plus("ioctl SIOCGIFFLAGS");

1462

1946

#ifdef __linux__

1463

1947

if(restore_loglevel){

1464

1948

ret = klogctl(7, NULL, 0);

1465

1949

if(ret == -1){

1466

perror("klogctl");

1950

perror_plus("klogctl");

1467

1951

}

1468

1952

}

1469

1953

#endif /* __linux__ */

1472

1956

errno = 0;

1473

1957

ret = seteuid(uid);

1474

1958

if(ret == -1){

1475

perror("seteuid");

1959

perror_plus("seteuid");

1476

1960

}

1477

1961

goto end;

1478

1962

}

1482

1966

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

1483

1967

if(ret == -1){

1484

1968

take_down_interface = false;

1485

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1486

1970

exitcode = EX_OSERR;

1487

1971

#ifdef __linux__

1488

1972

if(restore_loglevel){

1489

1973

ret = klogctl(7, NULL, 0);

1490

1974

if(ret == -1){

1491

perror("klogctl");

1975

perror_plus("klogctl");

1492

1976

}

1493

1977

}

1494

1978

#endif /* __linux__ */

1496

1980

errno = 0;

1497

1981

ret = seteuid(uid);

1498

1982

if(ret == -1){

1499

perror("seteuid");

1983

perror_plus("seteuid");

1500

1984

}

1501

1985

goto end;

1502

1986

}

1503

1987

}

1504

/* sleep checking until interface is running */

1988

/* Sleep checking until interface is running.

1989

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

1505

1990

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

1506

1991

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

1507

1992

if(ret == -1){

1508

perror("ioctl SIOCGIFFLAGS");

1993

perror_plus("ioctl SIOCGIFFLAGS");

1509

1994

} else if(network.ifr_flags & IFF_RUNNING){

1510

1995

break;

1511

1996

}

1512

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1513

1998

ret = nanosleep(&sleeptime, NULL);

1514

1999

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

1515

perror("nanosleep");

2000

perror_plus("nanosleep");

1516

2001

}

1517

2002

}

1518

2003

if(not take_down_interface){

1519

2004

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

1520

2005

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

1521

2006

if(ret == -1){

1522

perror("close");

2007

perror_plus("close");

1523

2008

}

1524

2009

}

1525

2010

#ifdef __linux__

1527

2012

/* Restores kernel loglevel to default */

1528

2013

ret = klogctl(7, NULL, 0);

1529

2014

if(ret == -1){

1530

perror("klogctl");

2015

perror_plus("klogctl");

1531

2016

}

1532

2017

}

1533

2018

#endif /* __linux__ */

1534

2019

/* Lower privileges */

1535

2020

errno = 0;

1536

if(take_down_interface){

1537

/* Lower privileges */

1538

ret = seteuid(uid);

1539

if(ret == -1){

1540

perror("seteuid");

1541

}

1542

} else {

1543

/* Lower privileges permanently */

1544

ret = setuid(uid);

1545

if(ret == -1){

1546

perror("setuid");

1547

}

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

1548

2025

}

1549

2026

}

1550

2027

1554

2031

1555

2032

ret = init_gnutls_global(pubkey, seckey);

1556

2033

if(ret == -1){

1557

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

2034

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

1558

2035

exitcode = EX_UNAVAILABLE;

1559

2036

goto end;

1560

2037

} else {

1565

2042

goto end;

1566

2043

}

1567

2044

2045

if(mkdtemp(tempdir) == NULL){

2046

perror_plus("mkdtemp");

2047

goto end;

2048

}

1568

2049

tempdir_created = true;

1569

if(mkdtemp(tempdir) == NULL){

1570

tempdir_created = false;

1571

perror("mkdtemp");

1572

goto end;

1573

}

1574

2050

1575

2051

if(quit_now){

1576

2052

goto end;

1577

2053

}

1578

2054

1579

2055

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

1580

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

2056

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

1581

2057

exitcode = EX_UNAVAILABLE;

1582

2058

goto end;

1583

2059

} else {

1593

2069

/* (Mainly meant for debugging) */

1594

2070

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

1595

2071

if(address == NULL){

1596

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

2072

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

1597

2073

exitcode = EX_USAGE;

1598

2074

goto end;

1599

2075

}

1607

2083

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

1608

2084

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

1609

2085

or tmpmax != (uint16_t)tmpmax){

1610

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

2086

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

1611

2087

exitcode = EX_USAGE;

1612

2088

goto end;

1613

2089

}

1618

2094

1619

2095

port = (uint16_t)tmpmax;

1620

2096

*address = '\0';

1621

address = connect_to;

1622

2097

/* Colon in address indicates IPv6 */

1623

2098

int af;

1624

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

2099

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

1625

2100

af = AF_INET6;

2101

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

2102

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

2103

{

2104

connect_to++;

2105

address[-1] = '\0';

2106

}

1626

2107

} else {

1627

2108

af = AF_INET;

1628

2109

}

2110

address = connect_to;

1629

2111

1630

2112

if(quit_now){

1631

2113

goto end;

1632

2114

}

1633

2115

1634

2116

while(not quit_now){

1635

2117

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

1636

2118

if(quit_now or ret == 0){

1637

2119

break;

1638

2120

}

1639

sleep(15);

1640

};

1641

2121

if(debug){

2122

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

2123

(int)retry_interval);

2124

}

2125

sleep((int)retry_interval);

2126

}

2127

1642

2128

if (not quit_now){

1643

2129

exitcode = EXIT_SUCCESS;

1644

2130

}

1645

2131

1646

2132

goto end;

1647

2133

}

1648

2134

1670

2156

1671

2157

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

1672

2158

if(mc.server == NULL){

1673

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

1674

avahi_strerror(error));

2159

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

2160

avahi_strerror(error));

1675

2161

exitcode = EX_UNAVAILABLE;

1676

2162

goto end;

1677

2163

}

1685

2171

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1686

2172

NULL, 0, browse_callback, NULL);

1687

2173

if(sb == NULL){

1688

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

1689

avahi_strerror(avahi_server_errno(mc.server)));

2174

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

2175

avahi_strerror(avahi_server_errno(mc.server)));

1690

2176

exitcode = EX_UNAVAILABLE;

1691

2177

goto end;

1692

2178

}

1698

2184

/* Run the main loop */

1699

2185

1700

2186

if(debug){

1701

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

1702

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

2187

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

2188

}

2189

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2192

if(debug){

2193

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

2194

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

2195

}

1705

2196

1706

2197

end:

1707

2198

1708

2199

if(debug){

1709

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

2200

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

1710

2201

}

1711

2202

1712

2203

/* Cleanup things */

1729

2220

gpgme_release(mc.ctx);

1730

2221

}

1731

2222

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

2223

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

2224

has seen */

2225

if(mc.current_server != NULL){

2226

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

2227

while(mc.current_server != NULL){

2228

server *next = mc.current_server->next;

2229

free(mc.current_server);

2230

mc.current_server = next;

2231

}

2232

}

2233

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

/* Re-raise priviliges */

2238

{

1735

2239

errno = 0;

1736

2240

ret = seteuid(0);

1737

2241

if(ret == -1){

1738

perror("seteuid");

2242

perror_plus("seteuid");

1739

2243

}

1740

if(geteuid() == 0){

2244

2245

/* Take down the network interface */

2246

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

1741

2247

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

1742

2248

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

1745

2251

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

1746

2252

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

1747

2253

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1749

2255

}

1750

2256

}

1751

2257

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

1752

2258

if(ret == -1){

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

2259

perror_plus("close");

1760

2260

}

1761

2261

}

1762

2262

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

1763

2269

1764

/* Removes the temp directory used by GPGME */

2270

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

1765

2271

if(tempdir_created){

1766

DIR *d;

1767

struct dirent *direntry;

1768

d = opendir(tempdir);

1769

if(d == NULL){

1770

if(errno != ENOENT){

1771

perror("opendir");

1772

}

1773

} else {

1774

while(true){

1775

direntry = readdir(d);

1776

if(direntry == NULL){

1777

break;

1778

}

1779

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

1780

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

1781

and (direntry->d_name[1] == '\0'

1782

or (direntry->d_name[1] == '.'

1783

and direntry->d_name[2] == '\0'))){

1784

continue;

1785

}

2272

struct dirent **direntries = NULL;

2273

struct dirent *direntry = NULL;

2274

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

2275

alphasort);

2276

if (numentries > 0){

2277

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

2278

direntry = direntries[i];

1786

2279

char *fullname = NULL;

1787

2280

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

1788

2281

direntry->d_name);

1789

2282

if(ret < 0){

1790

perror("asprintf");

2283

perror_plus("asprintf");

1791

2284

continue;

1792

2285

}

1793

2286

ret = remove(fullname);

1794

2287

if(ret == -1){

1795

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

1796

strerror(errno));

2288

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

2289

strerror(errno));

1797

2290

}

1798

2291

free(fullname);

1799

2292

}

1800

closedir(d);

2293

}

2294

2295

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

2296

free(direntries);

2297

if (numentries == -1){

2298

perror_plus("scandir");

1801

2299

}

1802

2300

ret = rmdir(tempdir);

1803

2301

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

1804

perror("rmdir");

2302

perror_plus("rmdir");

1805

2303

}

1806

2304

}

1807

2305

1812

2310

&old_sigterm_action,

1813

2311

NULL));

1814

2312

if(ret == -1){

1815

perror("sigaction");

2313

perror_plus("sigaction");

1816

2314

}

1817

2315

do {

1818

2316

ret = raise(signal_received);

1819

2317

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

1820

2318

if(ret != 0){

1821

perror("raise");

2319

perror_plus("raise");

1822

2320

abort();

1823

2321

}

1824

2322

TEMP_FAILURE_RETRY(pause());