/mandos/trunk : revision 505.2.12

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

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

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

174

program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

186

152

187

/*

153

188

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

154

189

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

155

190

* "buffer_length" is how much is already used.

156

191

*/

157

192

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

193

size_t buffer_capacity){

159

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

195

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

161

196

if(buffer == NULL){

166

201

return buffer_capacity;

167

202

}

168

203

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return -1;

212

}

213

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return -1;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

224

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

227

} else {

228

new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

239

}

240

169

241

/*

170

242

* Initialize GPGME.

171

243

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

174

246

gpgme_error_t rc;

175

247

gpgme_engine_info_t engine_info;

176

248

185

257

186

258

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

187

259

if(fd == -1){

188

perror("open");

260

perror_plus("open");

189

261

return false;

190

262

}

191

263

192

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

265

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));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

196

268

return false;

197

269

}

198

270

199

271

rc = gpgme_op_import(mc.ctx, pgp_data);

200

272

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

203

275

return false;

204

276

}

205

277

206

278

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

207

279

if(ret == -1){

208

perror("close");

280

perror_plus("close");

209

281

}

210

282

gpgme_data_release(pgp_data);

211

283

return true;

212

284

}

213

285

214

286

if(debug){

215

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

287

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

216

288

}

217

289

218

290

/* Init GPGME */

219

291

gpgme_check_version(NULL);

220

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

293

if(rc != GPG_ERR_NO_ERROR){

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

224

296

return false;

225

297

}

226

298

227

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

299

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

228

300

rc = gpgme_get_engine_info(&engine_info);

229

301

if(rc != GPG_ERR_NO_ERROR){

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

232

304

return false;

233

305

}

234

306

while(engine_info != NULL){

240

312

engine_info = engine_info->next;

241

313

}

242

314

if(engine_info == NULL){

243

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

315

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

316

tempdir);

244

317

return false;

245

318

}

246

319

247

320

/* Create new GPGME "context" */

248

321

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

249

322

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

252

326

return false;

253

327

}

254

328

273

347

ssize_t plaintext_length = 0;

274

348

275

349

if(debug){

276

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

350

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

277

351

}

278

352

279

353

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

280

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

355

0);

282

356

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));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

285

359

return -1;

286

360

}

287

361

288

362

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

289

363

rc = gpgme_data_new(&dh_plain);

290

364

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

293

368

gpgme_data_release(dh_crypto);

294

369

return -1;

295

370

}

298

373

data buffer */

299

374

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

300

375

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

303

378

plaintext_length = -1;

304

379

if(debug){

305

380

gpgme_decrypt_result_t result;

306

381

result = gpgme_op_decrypt_result(mc.ctx);

307

382

if(result == NULL){

308

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

383

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

309

384

} 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);

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

314

389

if(result->file_name != NULL){

315

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

390

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

316

391

}

317

392

gpgme_recipient_t recipient;

318

393

recipient = result->recipients;

319

394

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");

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

326

402

recipient = recipient->next;

327

403

}

328

404

}

331

407

}

332

408

333

409

if(debug){

334

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

410

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

335

411

}

336

412

337

413

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

338

414

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

339

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

340

416

plaintext_length = -1;

341

417

goto decrypt_end;

342

418

}

344

420

*plaintext = NULL;

345

421

while(true){

346

422

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

349

425

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

353

429

}

354

430

355

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

436

break;

361

437

}

362

438

if(ret < 0){

363

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

364

440

plaintext_length = -1;

365

441

goto decrypt_end;

366

442

}

368

444

}

369

445

370

446

if(debug){

371

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

447

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

372

448

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

373

449

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

374

450

}

396

472

/* GnuTLS log function callback */

397

473

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

398

474

const char* string){

399

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

475

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

400

476

}

401

477

402

478

static int init_gnutls_global(const char *pubkeyfilename,

404

480

int ret;

405

481

406

482

if(debug){

407

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

483

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

408

484

}

409

485

410

486

ret = gnutls_global_init();

411

487

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

414

490

return -1;

415

491

}

416

492

423

499

}

424

500

425

501

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

503

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));

504

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

505

safer_gnutls_strerror(ret));

433

506

gnutls_global_deinit();

434

507

return -1;

435

508

}

436

509

437

510

if(debug){

438

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

439

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

440

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

441

515

}

442

516

443

517

ret = gnutls_certificate_set_openpgp_key_file

444

518

(mc.cred, pubkeyfilename, seckeyfilename,

445

519

GNUTLS_OPENPGP_FMT_BASE64);

446

520

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));

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

452

526

goto globalfail;

453

527

}

454

528

455

529

/* GnuTLS server initialization */

456

530

ret = gnutls_dh_params_init(&mc.dh_params);

457

531

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

460

535

goto globalfail;

461

536

}

462

537

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

463

538

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

466

541

goto globalfail;

467

542

}

468

543

488

563

}

489

564

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

490

565

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

493

569

}

494

570

495

571

{

502

578

}

503

579

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

504

580

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));

581

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

582

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

583

safer_gnutls_strerror(ret));

508

584

gnutls_deinit(*session);

509

585

return -1;

510

586

}

519

595

}

520

596

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

521

597

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

524

600

gnutls_deinit(*session);

525

601

return -1;

526

602

}

571

647

pf = PF_INET;

572

648

break;

573

649

default:

574

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

650

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

575

651

errno = EINVAL;

576

652

return -1;

577

653

}

582

658

}

583

659

584

660

if(debug){

585

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

586

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

587

663

}

588

664

589

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

666

if(tcp_sd < 0){

591

667

int e = errno;

592

perror("socket");

668

perror_plus("socket");

593

669

errno = e;

594

670

goto mandos_end;

595

671

}

609

685

}

610

686

if(ret < 0 ){

611

687

int e = errno;

612

perror("inet_pton");

688

perror_plus("inet_pton");

613

689

errno = e;

614

690

goto mandos_end;

615

691

}

616

692

if(ret == 0){

617

693

int e = errno;

618

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

694

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

619

695

errno = e;

620

696

goto mandos_end;

621

697

}

626

702

627

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

704

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

629

-Wunreachable-code*/

705

-Wunreachable-code*/

630

706

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

633

709

errno = EINVAL;

634

710

goto mandos_end;

635

711

}

651

727

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

652

728

char interface[IF_NAMESIZE];

653

729

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

654

perror("if_indextoname");

730

perror_plus("if_indextoname");

655

731

} else {

656

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

657

ip, interface, port);

732

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

733

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

658

734

}

659

735

} else {

660

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

661

port);

736

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

737

ip, port);

662

738

}

663

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

747

sizeof(addrstr));

672

748

}

673

749

if(pcret == NULL){

674

perror("inet_ntop");

750

perror_plus("inet_ntop");

675

751

} else {

676

752

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

677

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

753

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

678

754

}

679

755

}

680

756

}

692

768

if(ret < 0){

693

769

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

694

770

int e = errno;

695

perror("connect");

771

perror_plus("connect");

696

772

errno = e;

697

773

}

698

774

goto mandos_end;

708

784

while(true){

709

785

size_t out_size = strlen(out);

710

786

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

711

out_size - written));

787

out_size - written));

712

788

if(ret == -1){

713

789

int e = errno;

714

perror("write");

790

perror_plus("write");

715

791

errno = e;

716

792

goto mandos_end;

717

793

}

734

810

}

735

811

736

812

if(debug){

737

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

813

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

738

814

}

739

815

740

816

if(quit_now){

742

818

goto mandos_end;

743

819

}

744

820

821

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

745

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

823

747

824

if(quit_now){

759

836

760

837

if(ret != GNUTLS_E_SUCCESS){

761

838

if(debug){

762

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

839

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

763

840

gnutls_perror(ret);

764

841

}

765

842

errno = EPROTO;

769

846

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

770

847

771

848

if(debug){

772

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

773

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

774

851

}

775

852

776

853

while(true){

781

858

}

782

859

783

860

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

861

buffer_capacity);

785

862

if(buffer_capacity == 0){

786

863

int e = errno;

787

perror("incbuffer");

864

perror_plus("incbuffer");

788

865

errno = e;

789

866

goto mandos_end;

790

867

}

814

891

}

815

892

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

816

893

if(ret < 0){

817

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

894

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

895

"***\n");

818

896

gnutls_perror(ret);

819

897

errno = EPROTO;

820

898

goto mandos_end;

821

899

}

822

900

break;

823

901

default:

824

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

825

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

826

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

905

errno = EIO;

828

906

goto mandos_end;

833

911

}

834

912

835

913

if(debug){

836

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

914

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

837

915

}

838

916

839

917

if(quit_now){

851

929

852

930

if(buffer_length > 0){

853

931

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

856

933

&decrypted_buffer);

857

934

if(decrypted_buffer_size >= 0){

858

935

869

946

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

870

947

int e = errno;

871

948

if(debug){

872

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

873

strerror(errno));

949

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

950

strerror(errno));

874

951

}

875

952

errno = e;

876

953

goto mandos_end;

895

972

if(e == 0){

896

973

e = errno;

897

974

}

898

perror("close");

975

perror_plus("close");

899

976

}

900

977

gnutls_deinit(session);

978

errno = e;

901

979

if(quit_now){

902

e = EINTR;

980

errno = EINTR;

903

981

retval = -1;

904

982

}

905

errno = e;

906

983

}

907

984

return retval;

908

985

}

933

1010

switch(event){

934

1011

default:

935

1012

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)));

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

939

1017

break;

940

1018

941

1019

case AVAHI_RESOLVER_FOUND:

943

1021

char ip[AVAHI_ADDRESS_STR_MAX];

944

1022

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

945

1023

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);

1024

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

1025

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

1026

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

949

1027

}

950

1028

int ret = start_mandos_communication(ip, port, interface,

951

1029

avahi_proto_to_af(proto));

952

1030

if(ret == 0){

953

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

954

1035

}

955

1036

}

956

1037

}

980

1061

default:

981

1062

case AVAHI_BROWSER_FAILURE:

982

1063

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

985

1066

avahi_simple_poll_quit(mc.simple_poll);

986

1067

return;

987

1068

994

1075

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

995

1076

name, type, domain, protocol, 0,

996

1077

resolve_callback, NULL) == NULL)

997

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

998

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

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

999

1081

break;

1000

1082

1001

1083

case AVAHI_BROWSER_REMOVE:

1004

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1088

if(debug){

1007

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

1089

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

1090

" searching...\n");

1008

1091

}

1009

1092

break;

1010

1093

}

1011

1094

}

1012

1095

1013

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

1096

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

1014

1097

static void handle_sigterm(int sig){

1015

1098

if(quit_now){

1016

1099

return;

1018

1101

quit_now = 1;

1019

1102

signal_received = sig;

1020

1103

int old_errno = errno;

1104

/* set main loop to exit */

1021

1105

if(mc.simple_poll != NULL){

1022

1106

avahi_simple_poll_quit(mc.simple_poll);

1023

1107

}

1024

1108

errno = old_errno;

1025

1109

}

1026

1110

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

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

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

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1081

1122

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1123

perror_plus("ioctl SIOCGIFFLAGS");

1084

1124

}

1085

free(flagstring);

1086

return 0;

1125

return false;

1087

1126

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1127

return true;

1128

}

1129

1130

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

1131

1090

1132

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1134

if(debug){

1093

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

1094

if_entry->d_name);

1135

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

1136

ifname);

1095

1137

}

1096

return 0;

1138

return false;

1097

1139

}

1098

1140

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

1099

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

1141

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

1100

1142

if(debug){

1101

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

1102

if_entry->d_name);

1143

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

1144

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

1103

1145

}

1104

return 1;

1146

return true;

1105

1147

}

1106

1148

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1149

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

1150

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1153

}

1154

return false;

1155

}

1156

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1158

if(debug){

1159

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

1160

ifname);

1161

}

1162

return false;

1163

}

1164

1114

1165

/* Accept this device */

1115

1166

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1240

int notdotentries(const struct dirent *direntry){

1241

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

1242

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

1243

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

1244

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

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

int ret;

1314

struct timespec now;

1315

struct timespec waited_time;

1316

intmax_t block_time;

1317

1318

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1321

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

1322

" No timeout!\n");

1323

}

1324

ret = avahi_simple_poll_iterate(s, -1);

1325

} else {

1326

if (debug){

1327

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

1328

" it, or wait\n");

1329

}

1330

/* the current time */

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1332

if(ret == -1){

1333

perror_plus("clock_gettime");

1334

return -1;

1335

}

1336

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

1337

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

1349

if (debug){

1350

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

1351

block_time);

1352

}

1353

1354

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1359

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1361

return 0;

1362

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1372

}

1373

1374

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

1375

}

1376

if(ret != 0){

1377

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

1378

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

1379

}

1380

}

1381

}

1382

}

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());

1435

fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());

1436

dup2(devnull, STDIN_FILENO);

1437

close(devnull);

1438

dup2(STDERR_FILENO, STDOUT_FILENO);

1439

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

1440

if(ret == -1){

1441

perror_plus("setenv");

1442

_exit(EX_OSERR);

1443

}

1444

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

1445

if(ret == -1){

1446

perror_plus("setenv");

1447

_exit(EX_OSERR);

1448

}

1449

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

1450

if(ret == -1){

1451

perror_plus("setenv");

1452

_exit(EX_OSERR);

1453

}

1454

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

1455

if(ret == -1){

1456

perror_plus("setenv");

1457

_exit(EX_OSERR);

1458

}

1459

char *delaystring;

1460

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

1461

if(ret == -1){

1462

perror_plus("asprintf");

1463

_exit(EX_OSERR);

1464

}

1465

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

1466

if(ret == -1){

1467

free(delaystring);

1468

perror_plus("setenv");

1469

_exit(EX_OSERR);

1470

}

1471

free(delaystring);

1472

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

1473

perror_plus("execl");

1474

} else {

1475

int status;

1476

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

1477

perror_plus("waitpid");

1478

free(fullname);

1479

continue;

1480

}

1481

if(WIFEXITED(status)){

1482

if(WEXITSTATUS(status) != 0){

1483

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

1484

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

1485

WEXITSTATUS(status));

1486

free(fullname);

1487

continue;

1488

}

1489

} else if(WIFSIGNALED(status)){

1490

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

1491

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

1492

WTERMSIG(status));

1493

free(fullname);

1494

continue;

1495

} else {

1496

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

1497

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

1498

free(fullname);

1499

continue;

1500

}

1501

}

1502

free(fullname);

1503

if(debug){

1504

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

1505

direntry->d_name);

1506

}

1507

}

1508

close(devnull);

1509

}

1510

return true;

1120

1511

}

1121

1512

1122

1513

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

1141

1532

bool gnutls_initialized = false;

1142

1533

bool gpgme_initialized = false;

1143

1534

float delay = 2.5f;

1535

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

1536

retrying the same server again */

1144

1537

1145

1538

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1539

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1545

errno = 0;

1153

1546

ret = setgid(gid);

1154

1547

if(ret == -1){

1155

perror("setgid");

1548

perror_plus("setgid");

1156

1549

}

1157

1550

1158

1551

/* Lower user privileges (temporarily) */

1159

1552

errno = 0;

1160

1553

ret = seteuid(uid);

1161

1554

if(ret == -1){

1162

perror("seteuid");

1555

perror_plus("seteuid");

1163

1556

}

1164

1557

1165

1558

if(quit_now){

1200

1593

.arg = "SECONDS",

1201

1594

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

1202

1595

.group = 2 },

1596

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

1597

.arg = "SECONDS",

1598

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

1599

.group = 2 },

1600

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

1601

.arg = "DIR",

1602

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

1603

.group = 2 },

1203

1604

/*

1204

1605

* These reproduce what we would get without ARGP_NO_HELP

1205

1606

*/

1249

1650

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

1250

1651

argp_error(state, "Bad delay");

1251

1652

}

1653

case 132: /* --retry */

1654

errno = 0;

1655

retry_interval = strtod(arg, &tmp);

1656

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

1657

or (retry_interval * 1000) > INT_MAX

1658

or retry_interval < 0){

1659

argp_error(state, "Bad retry interval");

1660

}

1661

break;

1662

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

1663

hookdir = arg;

1252

1664

break;

1253

1665

/*

1254

1666

* These reproduce what we would get without ARGP_NO_HELP

1261

1673

argp_state_help(state, state->out_stream,

1262

1674

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1675

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

1264

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

1676

fprintf_plus(state->out_stream,

1677

"Mandos plugin mandos-client: ");

1678

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

1265

1679

exit(argp_err_exit_status);

1266

1680

break;

1267

1681

default:

1282

1696

case ENOMEM:

1283

1697

default:

1284

1698

errno = ret;

1285

perror("argp_parse");

1699

perror_plus("argp_parse");

1286

1700

exitcode = EX_OSERR;

1287

1701

goto end;

1288

1702

case EINVAL:

1290

1704

goto end;

1291

1705

}

1292

1706

}

1707

1708

{

1709

/* Work around Debian bug #633582:

1710

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

1711

1712

/* Re-raise priviliges */

1713

errno = 0;

1714

ret = seteuid(0);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

} else {

1718

struct stat st;

1719

1720

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

1721

int seckey_fd = open(seckey, O_RDONLY);

1722

if(seckey_fd == -1){

1723

perror_plus("open");

1724

} else {

1725

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

1726

if(ret == -1){

1727

perror_plus("fstat");

1728

} else {

1729

if(S_ISREG(st.st_mode)

1730

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

1731

ret = fchown(seckey_fd, uid, gid);

1732

if(ret == -1){

1733

perror_plus("fchown");

1734

}

1735

}

1736

}

1737

TEMP_FAILURE_RETRY(close(seckey_fd));

1738

}

1739

}

1740

1741

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

1742

int pubkey_fd = open(pubkey, O_RDONLY);

1743

if(pubkey_fd == -1){

1744

perror_plus("open");

1745

} else {

1746

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

1747

if(ret == -1){

1748

perror_plus("fstat");

1749

} else {

1750

if(S_ISREG(st.st_mode)

1751

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

1752

ret = fchown(pubkey_fd, uid, gid);

1753

if(ret == -1){

1754

perror_plus("fchown");

1755

}

1756

}

1757

}

1758

TEMP_FAILURE_RETRY(close(pubkey_fd));

1759

}

1760

}

1761

1762

/* Lower privileges */

1763

errno = 0;

1764

ret = seteuid(uid);

1765

if(ret == -1){

1766

perror_plus("seteuid");

1767

}

1768

}

1769

}

1770

1771

/* Run network hooks */

1772

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

1773

goto end;

1774

}

1293

1775

1294

1776

if(not debug){

1295

1777

avahi_set_log_function(empty_log);

1296

1778

}

1297

1779

1298

1780

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

1299

1781

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1782

/* First look for interfaces that are up */

1783

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1784

alphasort);

1785

if(ret == 0){

1786

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

1787

free(direntries);

1788

ret = scandir(sys_class_net, &direntries, good_interface,

1789

alphasort);

1790

}

1302

1791

if(ret >= 1){

1303

/* Pick the first good interface */

1792

/* Pick the first interface returned */

1304

1793

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

1305

1794

if(debug){

1306

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

1795

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

1307

1796

}

1308

1797

if(interface == NULL){

1309

perror("malloc");

1798

perror_plus("malloc");

1310

1799

free(direntries);

1311

1800

exitcode = EXIT_FAILURE;

1312

1801

goto end;

1314

1803

free(direntries);

1315

1804

} else {

1316

1805

free(direntries);

1317

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

1806

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

1318

1807

exitcode = EXIT_FAILURE;

1319

1808

goto end;

1320

1809

}

1326

1815

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

1327

1816

mc.simple_poll = avahi_simple_poll_new();

1328

1817

if(mc.simple_poll == NULL){

1329

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

1818

fprintf_plus(stderr,

1819

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

1330

1820

exitcode = EX_UNAVAILABLE;

1331

1821

goto end;

1332

1822

}

1334

1824

sigemptyset(&sigterm_action.sa_mask);

1335

1825

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

1336

1826

if(ret == -1){

1337

perror("sigaddset");

1827

perror_plus("sigaddset");

1338

1828

exitcode = EX_OSERR;

1339

1829

goto end;

1340

1830

}

1341

1831

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

1342

1832

if(ret == -1){

1343

perror("sigaddset");

1833

perror_plus("sigaddset");

1344

1834

exitcode = EX_OSERR;

1345

1835

goto end;

1346

1836

}

1347

1837

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

1348

1838

if(ret == -1){

1349

perror("sigaddset");

1839

perror_plus("sigaddset");

1350

1840

exitcode = EX_OSERR;

1351

1841

goto end;

1352

1842

}

1356

1846

*/

1357

1847

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

1358

1848

if(ret == -1){

1359

perror("sigaction");

1849

perror_plus("sigaction");

1360

1850

return EX_OSERR;

1361

1851

}

1362

1852

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1853

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

1364

1854

if(ret == -1){

1365

perror("sigaction");

1855

perror_plus("sigaction");

1366

1856

exitcode = EX_OSERR;

1367

1857

goto end;

1368

1858

}

1369

1859

}

1370

1860

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

1371

1861

if(ret == -1){

1372

perror("sigaction");

1862

perror_plus("sigaction");

1373

1863

return EX_OSERR;

1374

1864

}

1375

1865

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1866

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

1377

1867

if(ret == -1){

1378

perror("sigaction");

1868

perror_plus("sigaction");

1379

1869

exitcode = EX_OSERR;

1380

1870

goto end;

1381

1871

}

1382

1872

}

1383

1873

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

1384

1874

if(ret == -1){

1385

perror("sigaction");

1875

perror_plus("sigaction");

1386

1876

return EX_OSERR;

1387

1877

}

1388

1878

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1879

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

1390

1880

if(ret == -1){

1391

perror("sigaction");

1881

perror_plus("sigaction");

1392

1882

exitcode = EX_OSERR;

1393

1883

goto end;

1394

1884

}

1398

1888

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

1399

1889

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1890

if(if_index == 0){

1401

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

1891

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

1402

1892

exitcode = EX_UNAVAILABLE;

1403

1893

goto end;

1404

1894

}

1411

1901

errno = 0;

1412

1902

ret = seteuid(0);

1413

1903

if(ret == -1){

1414

perror("seteuid");

1904

perror_plus("seteuid");

1415

1905

}

1416

1906

1417

1907

#ifdef __linux__

1421

1911

bool restore_loglevel = true;

1422

1912

if(ret == -1){

1423

1913

restore_loglevel = false;

1424

perror("klogctl");

1914

perror_plus("klogctl");

1425

1915

}

1426

1916

#endif /* __linux__ */

1427

1917

1428

1918

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1919

if(sd < 0){

1430

perror("socket");

1920

perror_plus("socket");

1431

1921

exitcode = EX_OSERR;

1432

1922

#ifdef __linux__

1433

1923

if(restore_loglevel){

1434

1924

ret = klogctl(7, NULL, 0);

1435

1925

if(ret == -1){

1436

perror("klogctl");

1926

perror_plus("klogctl");

1437

1927

}

1438

1928

}

1439

1929

#endif /* __linux__ */

1441

1931

errno = 0;

1442

1932

ret = seteuid(uid);

1443

1933

if(ret == -1){

1444

perror("seteuid");

1934

perror_plus("seteuid");

1445

1935

}

1446

1936

goto end;

1447

1937

}

1448

1938

strcpy(network.ifr_name, interface);

1449

1939

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

1450

1940

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1941

perror_plus("ioctl SIOCGIFFLAGS");

1452

1942

#ifdef __linux__

1453

1943

if(restore_loglevel){

1454

1944

ret = klogctl(7, NULL, 0);

1455

1945

if(ret == -1){

1456

perror("klogctl");

1946

perror_plus("klogctl");

1457

1947

}

1458

1948

}

1459

1949

#endif /* __linux__ */

1462

1952

errno = 0;

1463

1953

ret = seteuid(uid);

1464

1954

if(ret == -1){

1465

perror("seteuid");

1955

perror_plus("seteuid");

1466

1956

}

1467

1957

goto end;

1468

1958

}

1472

1962

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

1473

1963

if(ret == -1){

1474

1964

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1965

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1966

exitcode = EX_OSERR;

1477

1967

#ifdef __linux__

1478

1968

if(restore_loglevel){

1479

1969

ret = klogctl(7, NULL, 0);

1480

1970

if(ret == -1){

1481

perror("klogctl");

1971

perror_plus("klogctl");

1482

1972

}

1483

1973

}

1484

1974

#endif /* __linux__ */

1486

1976

errno = 0;

1487

1977

ret = seteuid(uid);

1488

1978

if(ret == -1){

1489

perror("seteuid");

1979

perror_plus("seteuid");

1490

1980

}

1491

1981

goto end;

1492

1982

}

1493

1983

}

1494

/* sleep checking until interface is running */

1984

/* Sleep checking until interface is running.

1985

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

1495

1986

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

1496

1987

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

1497

1988

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1989

perror_plus("ioctl SIOCGIFFLAGS");

1499

1990

} else if(network.ifr_flags & IFF_RUNNING){

1500

1991

break;

1501

1992

}

1502

1993

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

1994

ret = nanosleep(&sleeptime, NULL);

1504

1995

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

1505

perror("nanosleep");

1996

perror_plus("nanosleep");

1506

1997

}

1507

1998

}

1508

1999

if(not take_down_interface){

1509

2000

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

1510

2001

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

1511

2002

if(ret == -1){

1512

perror("close");

2003

perror_plus("close");

1513

2004

}

1514

2005

}

1515

2006

#ifdef __linux__

1517

2008

/* Restores kernel loglevel to default */

1518

2009

ret = klogctl(7, NULL, 0);

1519

2010

if(ret == -1){

1520

perror("klogctl");

2011

perror_plus("klogctl");

1521

2012

}

1522

2013

}

1523

2014

#endif /* __linux__ */

1524

2015

/* Lower privileges */

1525

2016

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

2017

/* Lower privileges */

2018

ret = seteuid(uid);

2019

if(ret == -1){

2020

perror_plus("seteuid");

1538

2021

}

1539

2022

}

1540

2023

1544

2027

1545

2028

ret = init_gnutls_global(pubkey, seckey);

1546

2029

if(ret == -1){

1547

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

2030

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

1548

2031

exitcode = EX_UNAVAILABLE;

1549

2032

goto end;

1550

2033

} else {

1555

2038

goto end;

1556

2039

}

1557

2040

2041

if(mkdtemp(tempdir) == NULL){

2042

perror_plus("mkdtemp");

2043

goto end;

2044

}

1558

2045

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2046

1565

2047

if(quit_now){

1566

2048

goto end;

1567

2049

}

1568

2050

1569

2051

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

1570

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

2052

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

1571

2053

exitcode = EX_UNAVAILABLE;

1572

2054

goto end;

1573

2055

} else {

1583

2065

/* (Mainly meant for debugging) */

1584

2066

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

1585

2067

if(address == NULL){

1586

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

2068

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

1587

2069

exitcode = EX_USAGE;

1588

2070

goto end;

1589

2071

}

1597

2079

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

1598

2080

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

1599

2081

or tmpmax != (uint16_t)tmpmax){

1600

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

2082

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

1601

2083

exitcode = EX_USAGE;

1602

2084

goto end;

1603

2085

}

1608

2090

1609

2091

port = (uint16_t)tmpmax;

1610

2092

*address = '\0';

1611

address = connect_to;

1612

2093

/* Colon in address indicates IPv6 */

1613

2094

int af;

1614

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

2095

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

1615

2096

af = AF_INET6;

2097

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

2098

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

2099

{

2100

connect_to++;

2101

address[-1] = '\0';

2102

}

1616

2103

} else {

1617

2104

af = AF_INET;

1618

2105

}

2106

address = connect_to;

1619

2107

1620

2108

if(quit_now){

1621

2109

goto end;

1622

2110

}

1623

2111

1624

2112

while(not quit_now){

1625

2113

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

1626

2114

if(quit_now or ret == 0){

1627

2115

break;

1628

2116

}

1629

sleep(15);

1630

};

1631

2117

if(debug){

2118

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

2119

(int)retry_interval);

2120

}

2121

sleep((int)retry_interval);

2122

}

2123

1632

2124

if (not quit_now){

1633

2125

exitcode = EXIT_SUCCESS;

1634

2126

}

1635

2127

1636

2128

goto end;

1637

2129

}

1638

2130

1660

2152

1661

2153

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

1662

2154

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2155

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

2156

avahi_strerror(error));

1665

2157

exitcode = EX_UNAVAILABLE;

1666

2158

goto end;

1667

2159

}

1675

2167

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

2168

NULL, 0, browse_callback, NULL);

1677

2169

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2170

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

2171

avahi_strerror(avahi_server_errno(mc.server)));

1680

2172

exitcode = EX_UNAVAILABLE;

1681

2173

goto end;

1682

2174

}

1688

2180

/* Run the main loop */

1689

2181

1690

2182

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2183

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

2184

}

2185

2186

ret = avahi_loop_with_timeout(mc.simple_poll,

2187

(int)(retry_interval * 1000));

2188

if(debug){

2189

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

2190

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

2191

}

1695

2192

1696

2193

end:

1697

2194

1698

2195

if(debug){

1699

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

2196

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

1700

2197

}

1701

2198

1702

2199

/* Cleanup things */

1719

2216

gpgme_release(mc.ctx);

1720

2217

}

1721

2218

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

2219

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

2220

has seen */

2221

if(mc.current_server != NULL){

2222

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

2223

while(mc.current_server != NULL){

2224

server *next = mc.current_server->next;

2225

free(mc.current_server);

2226

mc.current_server = next;

2227

}

2228

}

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Re-raise priviliges */

2234

{

1725

2235

errno = 0;

1726

2236

ret = seteuid(0);

1727

2237

if(ret == -1){

1728

perror("seteuid");

2238

perror_plus("seteuid");

1729

2239

}

1730

if(geteuid() == 0){

2240

2241

/* Take down the network interface */

2242

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

1731

2243

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

1732

2244

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2245

perror_plus("ioctl SIOCGIFFLAGS");

2246

} else if(network.ifr_flags & IFF_UP){

1735

2247

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

1736

2248

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

1737

2249

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2250

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2251

}

1740

2252

}

1741

2253

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

1742

2254

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

2255

perror_plus("close");

1750

2256

}

1751

2257

}

1752

2258

}

2259

/* Lower privileges permanently */

2260

errno = 0;

2261

ret = setuid(uid);

2262

if(ret == -1){

2263

perror_plus("setuid");

2264

}

1753

2265

1754

/* Removes the temp directory used by GPGME */

2266

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

1755

2267

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

2268

struct dirent **direntries = NULL;

2269

struct dirent *direntry = NULL;

2270

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

2271

alphasort);

2272

if (numentries > 0){

2273

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

2274

direntry = direntries[i];

1776

2275

char *fullname = NULL;

1777

2276

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

1778

2277

direntry->d_name);

1779

2278

if(ret < 0){

1780

perror("asprintf");

2279

perror_plus("asprintf");

1781

2280

continue;

1782

2281

}

1783

2282

ret = remove(fullname);

1784

2283

if(ret == -1){

1785

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

1786

strerror(errno));

2284

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

2285

strerror(errno));

1787

2286

}

1788

2287

free(fullname);

1789

2288

}

1790

closedir(d);

2289

}

2290

2291

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

2292

free(direntries);

2293

if (numentries == -1){

2294

perror_plus("scandir");

1791

2295

}

1792

2296

ret = rmdir(tempdir);

1793

2297

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

1794

perror("rmdir");

2298

perror_plus("rmdir");

1795

2299

}

1796

2300

}

1797

2301

1802

2306

&old_sigterm_action,

1803

2307

NULL));

1804

2308

if(ret == -1){

1805

perror("sigaction");

2309

perror_plus("sigaction");

1806

2310

}

1807

2311

do {

1808

2312

ret = raise(signal_received);

1809

2313

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

1810

2314

if(ret != 0){

1811

perror("raise");

2315

perror_plus("raise");

1812

2316

abort();

1813

2317

}

1814

2318

TEMP_FAILURE_RETRY(pause());